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esp_adc_cal/Remove lookup table

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This commit removes the lookup table mode due to inferior performance when compared
to linear mode under attenuation 0, 1 and 2. However small portions of the lookup table
are kept for the higher voltages of atten 3 (above ADC reading 2880). That voltage range
in atten 3 has non linear characteristics making the LUT performan better than linear mode.
This commit is contained in:
Darian Leung
2018-02-13 20:47:18 +08:00
parent 73cdfbfe79
commit 0c9e2c0fba
9 changed files with 381 additions and 647 deletions
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examples/peripherals/i2s_adc_dac/main/app_main.c
+3 -2
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@@ -269,9 +269,10 @@ void adc_read_task(void* arg)
adc1_config_width(ADC_WIDTH_12Bit);
adc1_config_channel_atten(ADC1_TEST_CHANNEL, ADC_ATTEN_11db);
esp_adc_cal_characteristics_t characteristics;
esp_adc_cal_get_characteristics(V_REF, ADC_ATTEN_11db, ADC_WIDTH_12Bit, &characteristics);
esp_adc_cal_characterize(ADC_UNIT_1, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_12, V_REF, &characteristics);
while(1) {
uint32_t voltage = adc1_to_voltage(ADC1_TEST_CHANNEL, &characteristics);
uint32_t voltage;
esp_adc_cal_get_voltage(ADC1_TEST_CHANNEL, &characteristics, &voltage);
ESP_LOGI(TAG, "%d mV", voltage);
vTaskDelay(200 / portTICK_RATE_MS);
}