DIY - ESP32：ESP32 ADC 模擬數碼轉換器 API 函數巨集及其它（四十七）

DIY - ESP32：ESP32 ADC 模擬數碼轉換器 API 數巨集及其它（四十七）：

除了 ESP32 ADC（模擬數碼轉換器 / Analog to Digital Converter）API 函數模塊外，還提供了巨集（Marco）、和枚舉（Enumerations）。

1. Macros：

Macros	Description
ADC_ATTEN_0db	The input voltage of ADC will be reduced to about 1/1
ADC_ATTEN_2_5dbm	The input voltage of ADC will be reduced to about 1/1.34
ADC_ATTEN_6db	The input voltage of ADC will be reduced to about 1/2
ADC_ATTEN_11db	The input voltage of ADC will be reduced to about 1/3.6
ADC_WIDTH_9Bit	ADC capture width is 9Bit
ADC_WIDTH_10Bit	ADC capture width is 10Bit
ADC_WIDTH_11Bit	ADC capture width is 11Bit
ADC_WIDTH_12Bit	ADC capture width is 12Bit

2. Enumerations：

2.1. enum adc_atten_t：

Enumeration	Description
ADC_ATTEN_DB_0 = 0	The input voltage of ADC will be reduced to about 1/1
ADC_ATTEN_DB_2_5 = 1	The input voltage of ADC will be reduced to about 1/1.34
ADC_ATTEN_DB_6 = 2	The input voltage of ADC will be reduced to about 1/2
ADC_ATTEN_DB_11 = 3	The input voltage of ADC will be reduced to about 1/3.6
ADC_ATTEN_MAX

2.2. enum adc_bits_width_t：

Enumeration	Description
ADC_WIDTH_BIT_9 = 0	ADC capture width is 9Bit
ADC_WIDTH_BIT_10 = 1	ADC capture width is 10Bit
ADC_WIDTH_BIT_11 = 2	ADC capture width is 11Bit
ADC_WIDTH_BIT_12 = 3	ADC capture width is 12Bit
ADC_WIDTH_MAX

2.3. enum adc1_channel_t：

Enumeration	Description
ADC1_CHANNEL_0 = 0	ADC1 channel 0 is GPIO36
ADC1_CHANNEL_1	ADC1 channel 1 is GPIO37
ADC1_CHANNEL_2	ADC1 channel 2 is GPIO38
ADC1_CHANNEL_3	ADC1 channel 3 is GPIO39
ADC1_CHANNEL_4	ADC1 channel 4 is GPIO32
ADC1_CHANNEL_5	ADC1 channel 5 is GPIO33
ADC1_CHANNEL_6	ADC1 channel 6 is GPIO34
ADC1_CHANNEL_7	ADC1 channel 7 is GPIO35
ADC1_CHANNEL_MAX

2.4. enum adc2_channel_t：

Enumeration	Description
ADC2_CHANNEL_0 = 0	ADC2 channel 0 is GPIO4
ADC2_CHANNEL_1	ADC2 channel 1 is GPIO0
ADC2_CHANNEL_2	ADC2 channel 2 is GPIO2
ADC2_CHANNEL_3	ADC2 channel 3 is GPIO15
ADC2_CHANNEL_4	ADC2 channel 4 is GPIO13
ADC2_CHANNEL_5	ADC2 channel 5 is GPIO12
ADC2_CHANNEL_6	ADC2 channel 6 is GPIO14
ADC2_CHANNEL_7	ADC2 channel 7 is GPIO27
ADC2_CHANNEL_8	ADC2 channel 8 is GPIO25
ADC2_CHANNEL_9	ADC2 channel 9 is GPIO26
ADC2_CHANNEL_MAX

2.5. enum adc_channel_t：

Enumeration	Description
ADC_CHANNEL_0 = 0	ADC channel 0
ADC_CHANNEL_1	ADC channel 1
ADC_CHANNEL_2	ADC channel 2
ADC_CHANNEL_3	ADC channel 3
ADC_CHANNEL_4	ADC channel 4
ADC_CHANNEL_5	ADC channel 5
ADC_CHANNEL_6	ADC channel 6
ADC_CHANNEL_7	ADC channel 7
ADC_CHANNEL_8	ADC channel 8
ADC_CHANNEL_9	ADC channel 9
ADC_CHANNEL_MAX

2.6. enum adc_unit_t：

Enumeration	Description
ADC_UNIT_1 = 1	SAR ADC 1
ADC_UNIT_2 = 2	SAR ADC 2, not supported yet
ADC_UNIT_BOTH = 3	SAR ADC 1 and 2, not supported yet
ADC_UNIT_ALTER = 7	SAR ADC 1 and 2 alternative mode, not supported yet
ADC_UNIT_MAX

2.7. enum adc_i2s_encode_t：

Enumeration	Description
ADC_ENCODE_12BIT	ADC to I2S data format, [15:12]-channel [11:0]-12 bits ADC data
ADC_ENCODE_11BIT	ADC to I2S data format, [15]-1 [14:11]-channel [10:0]-11 bits ADC data
ADC_ENCODE_MAX

2.8. enum adc_i2s_source_t：

Enumeration	Description
ADC_I2S_DATA_SRC_IO_SIG = 0	I2S data from GPIO matrix signal
ADC_I2S_DATA_SRC_ADC = 1	I2S data from ADC
ADC_I2S_DATA_SRC_MAX

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