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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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8
docs/api-reference/peripherals/adc.rst
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@@ -32,8 +32,8 @@ Reading voltage on ADC1 channel 0 (GPIO 36)::
...
adc1_config_width(ADC_WIDTH_12Bit);
adc1_config_channel_atten(ADC1_CHANNEL_0,ADC_ATTEN_0db);
adc1_config_width(ADC_WIDTH_BIT_12);
adc1_config_channel_atten(ADC1_CHANNEL_0,ADC_ATTEN_DB_0);
int val = adc1_get_raw(ADC1_CHANNEL_0);
The input voltage in above example is from 0 to 1.1V (0 dB attenuation). The input range can be extended by setting higher attenuation, see :cpp:type:`adc_atten_t`.
@@ -44,7 +44,7 @@ Reading the internal hall effect sensor::
...
adc1_config_width(ADC_WIDTH_12Bit);
adc1_config_width(ADC_WIDTH_BIT_12);
int val = hall_sensor_read();
@@ -81,7 +81,7 @@ Reading the ADC and obtaining a result in mV::
// Calculate ADC characteristics i.e. gain and offset factors
esp_adc_cal_characteristics_t characteristics;
esp_adc_cal_get_characteristics(V_REF, ADC_ATTEN_11db, ADC_WIDTH_12Bit, &characteristics);
esp_adc_cal_get_characteristics(V_REF, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_12, &characteristics);
// Read ADC and obtain result in mV
uint32_t voltage = adc1_to_voltage(ADC1_CHANNEL_6, &characteristics);