Jason2866
65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
/*
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* SPDX-FileCopyrightText: 2024 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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#include <stdint.h>
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#include <stdbool.h>
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#include "sdkconfig.h"
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#include "ulp_lp_core.h"
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#include "ulp_lp_core_utils.h"
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#include "ulp_lp_core_gpio.h"
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#include "ulp_lp_core_interrupts.h"
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#include "ulp_lp_core_print.h"
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#include "riscv/csr.h"
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#define DEBOUNCE_INTERVAL_CYCLES 10 // 10 cycles is about 0.625 us at 16 MHz
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#define SIMULATED_PULSE_FREQUENCY_HZ 2
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#define SIMULATED_PULSE_DELAY_US (1000000 / SIMULATED_PULSE_FREQUENCY_HZ) / 2
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uint32_t pulse_count;
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static uint32_t last_trigger_time_cycles;
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void LP_CORE_ISR_ATTR ulp_lp_core_lp_io_intr_handler(void)
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{
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ulp_lp_core_gpio_clear_intr_status();
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uint32_t trigger_time_cycles = RV_READ_CSR(mcycle);
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/* Do some simple debouncing, do not count spurious pulses */
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if (trigger_time_cycles - last_trigger_time_cycles > DEBOUNCE_INTERVAL_CYCLES) {
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pulse_count++;
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last_trigger_time_cycles = trigger_time_cycles;
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}
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if (pulse_count % CONFIG_EXAMPLE_PULSE_COUNT_WAKEUP_LIMIT == 0) {
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lp_core_printf("Pulse count: %d, wake-up main CPU\n", pulse_count);
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ulp_lp_core_wakeup_main_processor();
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}
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}
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int main (void)
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{
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lp_core_printf("LP Core pulse counter started\n");
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ulp_lp_core_intr_enable();
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ulp_lp_core_gpio_intr_enable(CONFIG_EXAMPLE_PULSE_COUNT_PIN, LP_IO_INTR_POSEDGE);
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while(1) {
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#if CONFIG_EXAMPLE_PULSE_COUNT_SIMULATE
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/* No external device connected to generate pulses, we simulate them ourselves instead */
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ulp_lp_core_delay_us(SIMULATED_PULSE_DELAY_US);
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ulp_lp_core_gpio_set_level(CONFIG_EXAMPLE_PULSE_COUNT_PIN, 1);
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ulp_lp_core_delay_us(SIMULATED_PULSE_DELAY_US);
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ulp_lp_core_gpio_set_level(CONFIG_EXAMPLE_PULSE_COUNT_PIN, 0);
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#else
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/* Put CPU into a wait state to reduce power consumption while waiting for pulses */
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ulp_lp_core_wait_for_intr();
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#endif //CONFIG_EXAMPLE_PULSE_COUNT_SIMULATE
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}
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return 0;
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}
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