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feature(I2S-ADC): add ADC mode for I2S.

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1. Support built-in ADC for I2S.
2. Modify code of ADC, made no change to the original APIs.
3. Add APIs in I2S:
esp_err_t i2s_set_adc_mode(adc_unit_t adc_unit, adc1_channel_t adc_channel);
4. Add I2S ADC/DAC example code.
5. add old-fashion definition to make it more compatible
6. replase spi_flash_ APIs with esp_partition_ APIs
7. add example of generating audio table from wav
8. change example sound
This commit is contained in:
Wangjialin
2017-08-23 23:12:56 +08:00
parent b2adaf2a4c
commit 2fceec4d85
24 changed files with 6242 additions and 162 deletions
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2
components/esp_adc_cal/esp_adc_cal.c
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@@ -78,7 +78,7 @@ uint32_t esp_adc_cal_raw_to_voltage(uint32_t adc,
const esp_adc_cal_characteristics_t *chars)
{
//Scale ADC to 12 bit width (0 to 4095)
adc <<= (ADC_WIDTH_12Bit - chars->bit_width);
adc <<= (ADC_WIDTH_BIT_12 - chars->bit_width);
uint32_t i = (adc >> chars->table->bit_shift); //find index for lut voltages
//Refernce LUT to obtain voltage using index
uint32_t voltage = esp_adc_cal_interpolate_round(chars->table->voltage[i],

2
components/esp_adc_cal/include/esp_adc_cal.h
View File

@@ -71,7 +71,7 @@ typedef struct {
for uint32 arithmetic */
uint32_t offset; /**<Offset in mV used to correct LUT Voltages to current v_ref */
uint32_t ideal_offset; /**<Offset in mV at the ideal reference voltage */
adc_bits_width_t bit_width; /**<Bit width of ADC e.g. ADC_WIDTH_12Bit */
adc_bits_width_t bit_width; /**<Bit width of ADC e.g. ADC_WIDTH_BIT_12 */
const esp_adc_cal_lookup_table_t *table; /**<Pointer to LUT */
} esp_adc_cal_characteristics_t;