ulp: Added support for RTC I2C driver for ULP RISC-V on esp32s2 and esp32s3
This commit adds support for using the RTC I2C peripheral on the ULP RISC-V core for esp32s2 and esp32s3. It also adds an example to demonstrate the usage of the RTC I2C peripheral. This commit also modifies the rtc_i2c register structure files to enable the use of bitfields in the ULP RISC-V RTC I2C driver.
This commit is contained in:
Sudeep Mohanty
@@ -194,6 +194,10 @@ examples/system/ulp_riscv/gpio_interrupt:
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temporary: true
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reason: the other targets are not tested yet
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examples/system/ulp_riscv/i2c:
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enable:
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- if: SOC_RISCV_COPROC_SUPPORTED == 1
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examples/system/ulp_riscv/uart_print:
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enable:
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- if: SOC_RISCV_COPROC_SUPPORTED == 1
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@@ -0,0 +1,6 @@
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# The following lines of boilerplate have to be in your project's CMakeLists
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# in this exact order for cmake to work correctly
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cmake_minimum_required(VERSION 3.16)
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include($ENV{IDF_PATH}/tools/cmake/project.cmake)
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project(ulp-riscv-rtc-i2c-example)
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@@ -0,0 +1,76 @@
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| Supported Targets | ESP32-S2 | ESP32-S3 |
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| ----------------- | -------- | -------- |
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# ULP RISC-V I2C Example
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This example demonstrates how to use the RTC I2C peripheral from the ULP RISC-V coprocessor in deep sleep.
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The ULP program is based on the BMP180 Temperature and Pressure sensor (https://cz.mouser.com/datasheet/2/783/BST-BMP180-DS000-1509579.pdf) which has an I2C interface. The main CPU initializes the RTC I2C peripheral, the BMP180 sensor and loads the ULP program. It then goes into deep sleep.
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The ULP program periodically measures the temperature and pressure values from the BMP180 sensor and wakesup the main CPU when the values are above a certain thershold.
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### Hardware Required
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* A development board with a SOC which has a RISC-V ULP coprocessor (e.g., ESP32-S2 Saola)
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* A BMP180 sensor module
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* A USB cable for power supply and programming
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## Example output
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Below is the output from this example.
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```
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Not a ULP-RISC V wakeup (cause = 0)
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Initializing RTC I2C ...
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RTC_I2C_STATUS_REG = 0x00000000
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Reading calibration data from BMP180 ...
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ac1 = 7819
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ac2 = -1152
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ac3 = -14317
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ac4 = 34252
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ac5 = 25122
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ac6 = 14289
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b1 = 6515
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b2 = 44
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mb = -32768
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mc = -11786
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md = 2746
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Reading initial uncompensated temperature and pressure data ...
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Uncompensated Temperature = 22865
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Uncompensated Pressure = 41768
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Real Temperature = 24.900000 deg celcius
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Real Pressure = 990.640000 hPa
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Entering in deep sleep
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ESP-ROM:esp32s2-rc4-20191025
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Build:Oct 25 2019
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rst:0x5 (DSLEEP),boot:0x9 (SPI_FAST_FLASH_BOOT)
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SPIWP:0xee
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mode:DIO, clock div:1
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load:0x3ffe6108,len:0x1298
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load:0x4004c000,len:0x92c
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load:0x40050000,len:0x2f04
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entry 0x4004c154
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W (76) spi_flash: Detected size(4096k) larger than the size in the binary image header(2048k). Using the size in the binary image header.
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ULP RISC-V woke up the main CPU
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Uncompensated Temperature = 22865
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Uncompensated Pressure = 41765
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Reading calibration data from BMP180 ...
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ac1 = 7819
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ac2 = -1152
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ac3 = -14317
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ac4 = 34252
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ac5 = 25122
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ac6 = 14289
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b1 = 6515
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b2 = 44
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mb = -32768
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mc = -11786
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md = 2746
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New Real Temperature = 24.900000 deg celcius
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New Real Pressure = 990.550000 hPa
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Entering in deep sleep
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```
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@@ -0,0 +1,25 @@
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idf_component_register(SRCS "ulp_riscv_rtc_i2c_example_main.c"
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INCLUDE_DIRS ""
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REQUIRES soc ulp)
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target_compile_options(${COMPONENT_LIB} PRIVATE "-Wno-format")
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#
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# ULP support additions to component CMakeLists.txt.
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#
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# 1. The ULP app name must be unique (if multiple components use ULP).
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set(ulp_app_name ulp_${COMPONENT_NAME})
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#
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# 2. Specify all C and Assembly source files.
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# Files should be placed into a separate directory (in this case, ulp/),
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# which should not be added to COMPONENT_SRCS.
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set(ulp_riscv_sources "ulp/main.c")
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#
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# 3. List all the component source files which include automatically
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# generated ULP export file, ${ulp_app_name}.h:
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set(ulp_exp_dep_srcs "ulp_riscv_rtc_i2c_example_main.c")
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#
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# 4. Call function to build ULP binary and embed in project using the argument
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# values above.
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ulp_embed_binary(${ulp_app_name} "${ulp_riscv_sources}" "${ulp_exp_dep_srcs}")
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@@ -0,0 +1,110 @@
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/*
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* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Unlicense OR CC0-1.0
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*/
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#pragma once
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/***************************************************
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* BMP180 Register Addresses
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***************************************************/
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#define BMP180_SENSOR_I2C_ADDR 0x77
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#define BMP180_SENSOR_REG_ADDR_WHO_AM_I 0xD0
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#define BMP180_SENSOR_REG_ADDR_SOFT_RESET 0xE0
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#define BMP180_SENSOR_REG_ADDR_AC1_MSB 0xAA
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#define BMP180_SENSOR_REG_ADDR_AC1_LSB 0xAB
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#define BMP180_SENSOR_REG_ADDR_AC2_MSB 0xAC
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#define BMP180_SENSOR_REG_ADDR_AC2_LSB 0xAD
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#define BMP180_SENSOR_REG_ADDR_AC3_MSB 0xAE
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#define BMP180_SENSOR_REG_ADDR_AC3_LSB 0xAF
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#define BMP180_SENSOR_REG_ADDR_AC4_MSB 0xB0
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#define BMP180_SENSOR_REG_ADDR_AC4_LSB 0xB1
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#define BMP180_SENSOR_REG_ADDR_AC5_MSB 0xB2
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#define BMP180_SENSOR_REG_ADDR_AC5_LSB 0xB3
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#define BMP180_SENSOR_REG_ADDR_AC6_MSB 0xB4
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#define BMP180_SENSOR_REG_ADDR_AC6_LSB 0xB5
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#define BMP180_SENSOR_REG_ADDR_B1_MSB 0xB6
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#define BMP180_SENSOR_REG_ADDR_B1_LSB 0xB7
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#define BMP180_SENSOR_REG_ADDR_B2_MSB 0xB8
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#define BMP180_SENSOR_REG_ADDR_B2_LSB 0xB9
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#define BMP180_SENSOR_REG_ADDR_MB_MSB 0xBA
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#define BMP180_SENSOR_REG_ADDR_MB_LSB 0xBB
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#define BMP180_SENSOR_REG_ADDR_MC_MSB 0xBC
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#define BMP180_SENSOR_REG_ADDR_MC_LSB 0xBD
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#define BMP180_SENSOR_REG_ADDR_MD_MSB 0xBE
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#define BMP180_SENSOR_REG_ADDR_MD_LSB 0xBF
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#define BMP180_SENSOR_REG_ADDR_CTRL_REG 0xF4
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#define BMP180_SENSOR_REG_ADDR_SENSOR_DATA_MSB 0xF6
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#define BMP180_SENSOR_REG_ADDR_SENSOR_DATA_LSB 0xF7
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#define BMP180_SENSOR_REG_ADDR_SENSOR_DATA_XLSB 0xF8
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/***************************************************
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* BMP180 Control Commands
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***************************************************/
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#define BMP180_SENSOR_CMD_READ_TEMPERATURE 0x2E
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#define BMP180_SENSOR_CMD_READ_PRESSURE_OSS_0 0x34
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#define BMP180_SENSOR_CMD_READ_PRESSURE_OSS_1 0x74
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#define BMP180_SENSOR_CMD_READ_PRESSURE_OSS_2 0xB4
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#define BMP180_SENSOR_CMD_READ_PRESSURE_OSS_3 0xF4
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#define BMP180_SENSOR_CMD_SOFT_RESET 0xB6
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/***************************************************
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* BMP180 Chip ID
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***************************************************/
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#define BMP180_SENSOR_CHIP_ID 0x55
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/***************************************************
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* BMP180 Calibration Data
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***************************************************/
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typedef struct {
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int16_t ac1;
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int16_t ac2;
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int16_t ac3;
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uint16_t ac4;
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uint16_t ac5;
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uint16_t ac6;
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int16_t b1;
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int16_t b2;
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int16_t mb;
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int16_t mc;
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int16_t md;
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} bmp180_cal_data_t;
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bmp180_cal_data_t bmp180_cal_data;
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/***************************************************
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* BMP180 Oversampling setting to measure pressure
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***************************************************/
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typedef enum {
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OSS_0 = 0, // Ultra low power
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OSS_1 = 1, // Standard
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OSS_2 = 2, // High resolution
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OSS_3 = 3 // Ultra high resolution
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} oss_mode_t;
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/***************************************************
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* BMP180 Interaction APIs
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***************************************************/
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static void bmp180_read_cal_data(void); // Read cal data
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static void bmp180_read_ut_data(int16_t *ut_data); // Read uncompensated temperature
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static void bmp180_read_up_data(int32_t *up_data, oss_mode_t oss_mode); // Read uncompensated pressure
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/************************************************
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* BMP180 Utility APIs
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************************************************/
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static void bmp180_read16(uint16_t *data_out, uint32_t reg_msb, uint32_t reg_lsb);
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static int32_t bmp180_calculate_real_temp(int32_t ut_data);
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static int32_t bmp180_calculate_real_pressure(int32_t up_data, int32_t ut_data, oss_mode_t oss_mode);
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/************************************************
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* Pressure measurement mode
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************************************************/
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#define EXAMPLE_OSS_MODE OSS_0
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/************************************************
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* Temperature and Pressure thresholds (uncompensated) to wake up Main CPU
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* The threshold values have been selected for demp purposes and may not
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* represent real world use case.
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************************************************/
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#define EXAMPLE_UT_THRESHOLD 20000
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#define EXAMPLE_UP_THRESHOLD 40000
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@@ -0,0 +1,126 @@
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/*
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* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Unlicense OR CC0-1.0
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*/
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/* ULP RISC-V RTC I2C example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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This code runs on ULP RISC-V coprocessor
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*/
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#include <stdint.h>
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#include "ulp_riscv.h"
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#include "ulp_riscv_utils.h"
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#include "ulp_riscv_i2c_ulp_core.h"
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#include "../bmp180_defs.h"
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/************************************************
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* Shared data between main CPU and ULP
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************************************************/
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int16_t ut_data = 0;
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int32_t up_data = 0;
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int32_t ut_threshold = EXAMPLE_UT_THRESHOLD;
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int32_t up_threshold = EXAMPLE_UP_THRESHOLD;
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oss_mode_t oss_mode = EXAMPLE_OSS_MODE;
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int main (void)
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{
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/* Read uncompensated temperature */
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bmp180_read_ut_data(&ut_data);
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/* Read uncompensated pressure */
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bmp180_read_up_data(&up_data, oss_mode);
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/* Wakeup the main CPU if either the uncompensated temperature or uncompensated pressure values
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* are more than their respective threshold values.
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*/
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if ((ut_data > ut_threshold) || (up_data > up_threshold)) {
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ulp_riscv_wakeup_main_processor();
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}
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return 0;
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}
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static void bmp180_read16(uint16_t *data_out, uint32_t reg_msb, uint32_t reg_lsb)
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{
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uint8_t data_rd = 0;
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*data_out = 0;
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ulp_riscv_i2c_master_set_slave_reg_addr(reg_msb);
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ulp_riscv_i2c_master_read_from_device(&data_rd, 1);
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*data_out |= (uint16_t)(data_rd << 8);
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ulp_riscv_i2c_master_set_slave_reg_addr(reg_lsb);
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data_rd = 0;
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ulp_riscv_i2c_master_read_from_device(&data_rd, 1);
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*data_out |= (uint16_t)(data_rd);
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}
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static void bmp180_read_ut_data(int16_t *ut_data)
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{
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/* Set slave register address to the control register */
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ulp_riscv_i2c_master_set_slave_reg_addr(BMP180_SENSOR_REG_ADDR_CTRL_REG);
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/* Setup control register to read temperature */
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uint8_t cmd = BMP180_SENSOR_CMD_READ_TEMPERATURE;
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ulp_riscv_i2c_master_write_to_device(&cmd, 1);
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/* Wait at least 4.5 milliseconds for the sensor to complete the reading */
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ulp_riscv_delay_cycles(5 * ULP_RISCV_CYCLES_PER_US * 1000);
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/* Read uncompensated temperature data */
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bmp180_read16((uint16_t *)ut_data, BMP180_SENSOR_REG_ADDR_SENSOR_DATA_MSB, BMP180_SENSOR_REG_ADDR_SENSOR_DATA_LSB);
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}
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static void bmp180_read_up_data(int32_t *up_data, oss_mode_t oss_mode)
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{
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uint16_t press_high;
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uint8_t press_low;
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/* Set slave register address to the control register */
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ulp_riscv_i2c_master_set_slave_reg_addr(BMP180_SENSOR_REG_ADDR_CTRL_REG);
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/* Setup control register to read pressure */
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uint8_t cmd = 0;
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uint8_t wait = 0;
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switch(oss_mode)
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{
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case OSS_0:
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cmd = BMP180_SENSOR_CMD_READ_PRESSURE_OSS_0;
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wait = 5; // Wait atleast 4.5 msec
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break;
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case OSS_1:
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cmd = BMP180_SENSOR_CMD_READ_PRESSURE_OSS_1;
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wait = 8; // Wait atleast 7.5 msec
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break;
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case OSS_2:
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cmd = BMP180_SENSOR_CMD_READ_PRESSURE_OSS_2;
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wait = 14; // Wait atleast 13.5 msec
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break;
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case OSS_3:
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cmd = BMP180_SENSOR_CMD_READ_PRESSURE_OSS_3;
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wait = 26; // Wait atleast 25.5 msec
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break;
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}
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ulp_riscv_i2c_master_write_to_device(&cmd, 1);
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/* Wait for the required amount of time for the sensor to complete the reading */
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ulp_riscv_delay_cycles(wait * ULP_RISCV_CYCLES_PER_US * 1000);
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/* Read uncompensated temperature data */
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/* Read MSB + LSB */
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bmp180_read16(&press_high, BMP180_SENSOR_REG_ADDR_SENSOR_DATA_MSB, BMP180_SENSOR_REG_ADDR_SENSOR_DATA_LSB);
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/* Read XLSB */
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ulp_riscv_i2c_master_set_slave_reg_addr(BMP180_SENSOR_REG_ADDR_SENSOR_DATA_XLSB);
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ulp_riscv_i2c_master_read_from_device(&press_low, 1);
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*up_data = (((uint32_t)press_high << 8) + (uint32_t)press_low) >> (8 - oss_mode);
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}
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@@ -0,0 +1,351 @@
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/*
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* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Unlicense OR CC0-1.0
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*/
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/* ULP RISC-V RTC I2C example
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||||
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This example code is in the Public Domain (or CC0 licensed, at your option.)
|
||||
|
||||
Unless required by applicable law or agreed to in writing, this
|
||||
software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
|
||||
CONDITIONS OF ANY KIND, either express or implied.
|
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*/
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#include <stdio.h>
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#include <math.h>
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#include "esp_sleep.h"
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#include "ulp_riscv.h"
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#include "ulp_riscv_i2c.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "ulp_main.h"
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#include "bmp180_defs.h"
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extern const uint8_t ulp_main_bin_start[] asm("_binary_ulp_main_bin_start");
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extern const uint8_t ulp_main_bin_end[] asm("_binary_ulp_main_bin_end");
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/************************************************
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* ULP utility APIs
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************************************************/
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static void init_ulp_program(void);
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/************************************************
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* RTC I2C utility APIs
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************************************************/
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static void init_i2c(void);
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void app_main(void)
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{
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uint8_t data_rd = 0;
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int16_t ut_data = 0;
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int32_t up_data = 0;
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int32_t temperature = 0;
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int32_t pressure = 0;
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oss_mode_t oss_mode;
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esp_sleep_wakeup_cause_t cause = esp_sleep_get_wakeup_cause();
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/* Not a wakeup from ULP
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* Initialize RTC I2C
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* Setup BMP180 sensor
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* Store current temperature and pressure values
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* Load the ULP firmware
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* Go to deep sleep
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*/
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if (cause != ESP_SLEEP_WAKEUP_ULP) {
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printf("Not a ULP-RISC V wakeup (cause = %d)\n", cause);
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/* Initialize RTC I2C */
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init_i2c();
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/* Configure I2C slave address */
|
||||
ulp_riscv_i2c_master_set_slave_addr(BMP180_SENSOR_I2C_ADDR);
|
||||
|
||||
/* Reset the BMP180 sensor*/
|
||||
ulp_riscv_i2c_master_set_slave_reg_addr(BMP180_SENSOR_REG_ADDR_SOFT_RESET);
|
||||
uint8_t data_wr = BMP180_SENSOR_CMD_SOFT_RESET;
|
||||
ulp_riscv_i2c_master_write_to_device(&data_wr, 1);
|
||||
|
||||
/* Confirm that the sensor is alive
|
||||
* The BMP180 returns the chip id 0x55 on quering reg addr 0xD0
|
||||
*/
|
||||
ulp_riscv_i2c_master_set_slave_reg_addr(BMP180_SENSOR_REG_ADDR_WHO_AM_I);
|
||||
ulp_riscv_i2c_master_read_from_device(&data_rd, 1);
|
||||
if (data_rd != BMP180_SENSOR_CHIP_ID) {
|
||||
printf("ERROR: Cannot communicate with I2C sensor\n");
|
||||
abort();
|
||||
}
|
||||
|
||||
/* Read the calibration data */
|
||||
printf("Reading calibration data from BMP180 ...\n");
|
||||
bmp180_read_cal_data();
|
||||
printf("\n");
|
||||
|
||||
/* Read uncompensated temperature and pressure */
|
||||
printf("Reading initial uncompensated temperature and pressure data ...\n");
|
||||
ut_data = 0;
|
||||
up_data = 0;
|
||||
oss_mode = EXAMPLE_OSS_MODE;
|
||||
bmp180_read_ut_data(&ut_data);
|
||||
bmp180_read_up_data(&up_data, oss_mode);
|
||||
printf("Uncompensated Temperature = %d\n", ut_data);
|
||||
printf("Uncompensated Pressure = %d\n", up_data);
|
||||
printf("\n");
|
||||
|
||||
/* Calculate real temperature value */
|
||||
temperature = bmp180_calculate_real_temp((int32_t)ut_data);
|
||||
printf("Real Temperature = %f deg celcius\n", (float)(temperature/10.0));
|
||||
|
||||
/* Calculate real pressure value */
|
||||
pressure = bmp180_calculate_real_pressure(up_data, (int32_t)ut_data, oss_mode);
|
||||
printf("Real Pressure = %f hPa\n", pressure / 100.0);
|
||||
printf("\n");
|
||||
|
||||
/* Load ULP firmware
|
||||
*
|
||||
* The ULP is responsible of monitoring the temperature and pressure values
|
||||
* periodically. It will wakeup the main CPU if the temperature and pressure
|
||||
* values are above a certain threshold.
|
||||
*/
|
||||
init_ulp_program();
|
||||
}
|
||||
|
||||
/* ULP RISC-V read and detected a temperature or pressure above the limit */
|
||||
if (cause == ESP_SLEEP_WAKEUP_ULP) {
|
||||
printf("ULP RISC-V woke up the main CPU\n");
|
||||
|
||||
/* Pause ULP while we are using the RTC I2C from the main CPU */
|
||||
ulp_timer_stop();
|
||||
ulp_riscv_halt();
|
||||
|
||||
printf("Uncompensated Temperature = %d\n", ulp_ut_data);
|
||||
printf("Uncompensated Pressure = %d\n", ulp_up_data);
|
||||
|
||||
/* Read the calibration data again */
|
||||
printf("Reading calibration data from BMP180 ...\n");
|
||||
bmp180_read_cal_data();
|
||||
printf("\n");
|
||||
|
||||
/* Calculate real temperature and pressure again */
|
||||
temperature = 0;
|
||||
temperature = bmp180_calculate_real_temp((int32_t)ulp_ut_data);
|
||||
printf("New Real Temperature = %f deg celcius\n", (float)(temperature/10.0));
|
||||
|
||||
/* Calculate real pressure value */
|
||||
pressure = 0;
|
||||
pressure = bmp180_calculate_real_pressure(ulp_up_data, (int32_t)ulp_ut_data, oss_mode);
|
||||
printf("New Real Pressure = %f hPa\n", pressure / 100.0);
|
||||
|
||||
/* Resume ULP and go to deep sleep again */
|
||||
ulp_timer_resume();
|
||||
}
|
||||
|
||||
|
||||
/* Add a delay for everything to the printed before heading in to light sleep */
|
||||
vTaskDelay(100);
|
||||
|
||||
/* Go back to sleep, only the ULP RISC-V will run */
|
||||
printf("Entering deep sleep\n\n");
|
||||
|
||||
/* RTC peripheral power domain needs to be kept on to keep RTC I2C related configs during sleep */
|
||||
esp_sleep_pd_config(ESP_PD_DOMAIN_RTC_PERIPH, ESP_PD_OPTION_ON);
|
||||
|
||||
ESP_ERROR_CHECK(esp_sleep_enable_ulp_wakeup());
|
||||
|
||||
esp_deep_sleep_start();
|
||||
}
|
||||
|
||||
static void init_i2c(void)
|
||||
{
|
||||
/* Configure RTC I2C */
|
||||
printf("Initializing RTC I2C ...\n");
|
||||
ulp_riscv_i2c_cfg_t i2c_cfg = ULP_RISCV_I2C_DEFAULT_CONFIG();
|
||||
ulp_riscv_i2c_master_init(&i2c_cfg);
|
||||
}
|
||||
|
||||
static void bmp180_read16(uint16_t *data_out, uint32_t reg_msb, uint32_t reg_lsb)
|
||||
{
|
||||
uint8_t data_rd = 0;
|
||||
*data_out = 0;
|
||||
|
||||
ulp_riscv_i2c_master_set_slave_reg_addr(reg_msb);
|
||||
ulp_riscv_i2c_master_read_from_device(&data_rd, 1);
|
||||
*data_out |= (uint16_t)(data_rd << 8);
|
||||
ulp_riscv_i2c_master_set_slave_reg_addr(reg_lsb);
|
||||
data_rd = 0;
|
||||
ulp_riscv_i2c_master_read_from_device(&data_rd, 1);
|
||||
*data_out |= (uint16_t)(data_rd);
|
||||
}
|
||||
|
||||
static void bmp180_read_cal_data(void)
|
||||
{
|
||||
/* AC1 */
|
||||
bmp180_read16((uint16_t *)&bmp180_cal_data.ac1, BMP180_SENSOR_REG_ADDR_AC1_MSB, BMP180_SENSOR_REG_ADDR_AC1_LSB);
|
||||
printf("ac1 = %d\n", bmp180_cal_data.ac1);
|
||||
|
||||
/* AC2 */
|
||||
bmp180_read16((uint16_t *)&bmp180_cal_data.ac2, BMP180_SENSOR_REG_ADDR_AC2_MSB, BMP180_SENSOR_REG_ADDR_AC2_LSB);
|
||||
printf("ac2 = %d\n", bmp180_cal_data.ac2);
|
||||
|
||||
/* AC3 */
|
||||
bmp180_read16((uint16_t *)&bmp180_cal_data.ac3, BMP180_SENSOR_REG_ADDR_AC3_MSB, BMP180_SENSOR_REG_ADDR_AC3_LSB);
|
||||
printf("ac3 = %d\n", bmp180_cal_data.ac3);
|
||||
|
||||
/* AC4 */
|
||||
bmp180_read16(&bmp180_cal_data.ac4, BMP180_SENSOR_REG_ADDR_AC4_MSB, BMP180_SENSOR_REG_ADDR_AC4_LSB);
|
||||
printf("ac4 = %u\n", bmp180_cal_data.ac4);
|
||||
|
||||
/* AC5 */
|
||||
bmp180_read16(&bmp180_cal_data.ac5, BMP180_SENSOR_REG_ADDR_AC5_MSB, BMP180_SENSOR_REG_ADDR_AC5_LSB);
|
||||
printf("ac5 = %u\n", bmp180_cal_data.ac5);
|
||||
|
||||
/* AC6 */
|
||||
bmp180_read16(&bmp180_cal_data.ac6, BMP180_SENSOR_REG_ADDR_AC6_MSB, BMP180_SENSOR_REG_ADDR_AC6_LSB);
|
||||
printf("ac6 = %u\n", bmp180_cal_data.ac6);
|
||||
|
||||
/* B1 */
|
||||
bmp180_read16((uint16_t *)&bmp180_cal_data.b1, BMP180_SENSOR_REG_ADDR_B1_MSB, BMP180_SENSOR_REG_ADDR_B1_LSB);
|
||||
printf("b1 = %d\n", bmp180_cal_data.b1);
|
||||
|
||||
/* B2 */
|
||||
bmp180_read16((uint16_t *)&bmp180_cal_data.b2, BMP180_SENSOR_REG_ADDR_B2_MSB, BMP180_SENSOR_REG_ADDR_B2_LSB);
|
||||
printf("b2 = %d\n", bmp180_cal_data.b2);
|
||||
|
||||
/* MB */
|
||||
bmp180_read16((uint16_t *)&bmp180_cal_data.mb, BMP180_SENSOR_REG_ADDR_MB_MSB, BMP180_SENSOR_REG_ADDR_MB_LSB);
|
||||
printf("mb = %d\n", bmp180_cal_data.mb);
|
||||
|
||||
/* MC */
|
||||
bmp180_read16((uint16_t *)&bmp180_cal_data.mc, BMP180_SENSOR_REG_ADDR_MC_MSB, BMP180_SENSOR_REG_ADDR_MC_LSB);
|
||||
printf("mc = %d\n", bmp180_cal_data.mc);
|
||||
|
||||
/* MD */
|
||||
bmp180_read16((uint16_t *)&bmp180_cal_data.md, BMP180_SENSOR_REG_ADDR_MD_MSB, BMP180_SENSOR_REG_ADDR_MD_LSB);
|
||||
printf("md = %d\n", bmp180_cal_data.md);
|
||||
}
|
||||
|
||||
static void bmp180_read_ut_data(int16_t *ut_data)
|
||||
{
|
||||
/* Set slave register address to the control register */
|
||||
ulp_riscv_i2c_master_set_slave_reg_addr(BMP180_SENSOR_REG_ADDR_CTRL_REG);
|
||||
|
||||
/* Setup control register to read temperature */
|
||||
uint8_t cmd = BMP180_SENSOR_CMD_READ_TEMPERATURE;
|
||||
ulp_riscv_i2c_master_write_to_device(&cmd, 1);
|
||||
|
||||
/* Wait at least 4.5 milliseconds for the sensor to complete the reading */
|
||||
vTaskDelay(pdMS_TO_TICKS(5));
|
||||
|
||||
/* Read uncompensated temperature data */
|
||||
bmp180_read16((uint16_t *)ut_data, BMP180_SENSOR_REG_ADDR_SENSOR_DATA_MSB, BMP180_SENSOR_REG_ADDR_SENSOR_DATA_LSB);
|
||||
}
|
||||
|
||||
static int32_t computeb5(int32_t ut_data)
|
||||
{
|
||||
int32_t x1 = (ut_data - (int32_t)bmp180_cal_data.ac6) * ((int32_t)bmp180_cal_data.ac5) >> 15;
|
||||
int32_t x2 = ((int32_t)bmp180_cal_data.mc << 11) / (x1 + (int32_t)bmp180_cal_data.md);
|
||||
return x1 + x2;
|
||||
}
|
||||
|
||||
static int32_t bmp180_calculate_real_temp(int32_t ut_data)
|
||||
{
|
||||
int32_t b5 = computeb5(ut_data);
|
||||
int32_t t = (b5 + 8) >> 4;
|
||||
|
||||
return t;
|
||||
}
|
||||
|
||||
static void bmp180_read_up_data(int32_t *up_data, oss_mode_t oss_mode)
|
||||
{
|
||||
uint16_t press_high;
|
||||
uint8_t press_low;
|
||||
|
||||
/* Set slave register address to the control register */
|
||||
ulp_riscv_i2c_master_set_slave_reg_addr(BMP180_SENSOR_REG_ADDR_CTRL_REG);
|
||||
|
||||
/* Setup control register to read pressure */
|
||||
uint8_t cmd = 0;
|
||||
uint8_t wait = 0;
|
||||
switch(oss_mode)
|
||||
{
|
||||
case OSS_0:
|
||||
cmd = BMP180_SENSOR_CMD_READ_PRESSURE_OSS_0;
|
||||
wait = 5; // Wait atleast 4.5 msec
|
||||
break;
|
||||
case OSS_1:
|
||||
cmd = BMP180_SENSOR_CMD_READ_PRESSURE_OSS_1;
|
||||
wait = 8; // Wait atleast 7.5 msec
|
||||
break;
|
||||
case OSS_2:
|
||||
cmd = BMP180_SENSOR_CMD_READ_PRESSURE_OSS_2;
|
||||
wait = 14; // Wait atleast 13.5 msec
|
||||
break;
|
||||
case OSS_3:
|
||||
cmd = BMP180_SENSOR_CMD_READ_PRESSURE_OSS_3;
|
||||
wait = 26; // Wait atleast 25.5 msec
|
||||
break;
|
||||
}
|
||||
|
||||
ulp_riscv_i2c_master_write_to_device(&cmd, 1);
|
||||
|
||||
/* Wait for the required amount of time for the sensor to complete the reading */
|
||||
vTaskDelay(pdMS_TO_TICKS(wait));
|
||||
|
||||
/* Read uncompensated temperature data */
|
||||
|
||||
/* Read MSB + LSB */
|
||||
bmp180_read16(&press_high, BMP180_SENSOR_REG_ADDR_SENSOR_DATA_MSB, BMP180_SENSOR_REG_ADDR_SENSOR_DATA_LSB);
|
||||
|
||||
/* Read XLSB */
|
||||
ulp_riscv_i2c_master_set_slave_reg_addr(BMP180_SENSOR_REG_ADDR_SENSOR_DATA_XLSB);
|
||||
ulp_riscv_i2c_master_read_from_device(&press_low, 1);
|
||||
|
||||
*up_data = (((uint32_t)press_high << 8) + (uint32_t)press_low) >> (8 - oss_mode);
|
||||
}
|
||||
|
||||
static int32_t bmp180_calculate_real_pressure(int32_t up_data, int32_t ut_data, oss_mode_t oss_mode)
|
||||
{
|
||||
int32_t p, x1, x2, x3, b3, b5, b6;
|
||||
uint32_t b4, b7;
|
||||
|
||||
b5 = computeb5(ut_data);
|
||||
b6 = b5 - 4000;
|
||||
x1 = (bmp180_cal_data.b2 * ((b6 * b6) >> 12)) >> 11;
|
||||
x2 = (bmp180_cal_data.ac2 * b6) >> 11;
|
||||
x3 = x1 + x2;
|
||||
b3 = (((((int32_t) bmp180_cal_data.ac1) * 4 + x3) << oss_mode) + 2) >> 2;
|
||||
x1 = (bmp180_cal_data.ac3 * b6) >> 13;
|
||||
x2 = (bmp180_cal_data.b1 * ((b6 * b6) >> 12)) >> 16;
|
||||
x3 = ((x1 + x2) + 2) >> 2;
|
||||
b4 = (bmp180_cal_data.ac4 * (uint32_t) (x3 + 32768)) >> 15;
|
||||
b7 = ((uint32_t) (up_data - b3) * (50000 >> oss_mode));
|
||||
|
||||
if (b7 < 0x80000000) {
|
||||
p = (b7 << 1) / b4;
|
||||
} else {
|
||||
p = (b7 / b4) << 1;
|
||||
}
|
||||
|
||||
x1 = (p >> 8) * (p >> 8);
|
||||
x1 = (x1 * 3038) >> 16;
|
||||
x2 = (-7357 * p) >> 16;
|
||||
p = p + ((x1 + x2 + 3791) >> 4);
|
||||
|
||||
return p;
|
||||
}
|
||||
|
||||
static void init_ulp_program(void)
|
||||
{
|
||||
esp_err_t err = ulp_riscv_load_binary(ulp_main_bin_start, (ulp_main_bin_end - ulp_main_bin_start));
|
||||
ESP_ERROR_CHECK(err);
|
||||
|
||||
/* The first argument is the period index, which is not used by the ULP-RISC-V timer
|
||||
* The second argument is the period in microseconds, which gives a wakeup time period of: 20ms
|
||||
*/
|
||||
ulp_set_wakeup_period(0, 20000);
|
||||
|
||||
/* Start the program */
|
||||
err = ulp_riscv_run();
|
||||
ESP_ERROR_CHECK(err);
|
||||
}
|
||||
@@ -0,0 +1,9 @@
|
||||
# Enable ULP
|
||||
CONFIG_ULP_COPROC_ENABLED=y
|
||||
CONFIG_ULP_COPROC_RISCV=y
|
||||
CONFIG_ULP_COPROC_RESERVE_MEM=4096
|
||||
# Set log level to Warning to produce clean output
|
||||
CONFIG_BOOTLOADER_LOG_LEVEL_WARN=y
|
||||
CONFIG_BOOTLOADER_LOG_LEVEL=2
|
||||
CONFIG_LOG_DEFAULT_LEVEL_WARN=y
|
||||
CONFIG_LOG_DEFAULT_LEVEL=2
|
||||
Reference in New Issue
Block a user