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Add basic ADC calibration.

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This commit is contained in:
anecdata
2019-10-17 00:12:35 -05:00
parent b9c66fa1b1
commit 6bb17bb179
3 changed files with 23 additions and 5 deletions
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22
arduino/cores/esp32/wiring_analog.c
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@@ -19,6 +19,7 @@
#include <driver/ledc.h>
#include <driver/adc.h>
#include <esp_adc_cal.h>
#include <soc/adc_channel.h>
#include "wiring_analog.h"
@@ -46,33 +47,48 @@ void analogWrite(uint32_t pin, uint32_t value)
ledc_channel_config(&ledc_conf);
}
int analogRead(uint32_t pin)
int analogRead(uint32_t pin, uint32_t atten)
{
int channel;
#define DEFAULT_VREF 1100
static esp_adc_cal_characteristics_t *adc_chars;
adc_channel_t channel;
switch(pin)
{
case ADC1_CHANNEL_0_GPIO_NUM:
channel = ADC1_GPIO36_CHANNEL;
break;
case ADC1_CHANNEL_1_GPIO_NUM:
channel = ADC1_GPIO37_CHANNEL;
break;
case ADC1_CHANNEL_2_GPIO_NUM:
channel = ADC1_GPIO38_CHANNEL;
break;
case ADC1_CHANNEL_3_GPIO_NUM:
channel = ADC1_GPIO39_CHANNEL;
break;
case ADC1_CHANNEL_4_GPIO_NUM:
channel = ADC1_GPIO32_CHANNEL;
break;
case ADC1_CHANNEL_5_GPIO_NUM:
channel = ADC1_GPIO33_CHANNEL;
break;
case ADC1_CHANNEL_6_GPIO_NUM:
channel = ADC1_GPIO34_CHANNEL;
break;
case ADC1_CHANNEL_7_GPIO_NUM:
channel = ADC1_GPIO35_CHANNEL;
break;
default:
return -1;
}
adc1_config_width(ADC_WIDTH_BIT_12);
adc1_config_channel_atten(channel, ADC_ATTEN_DB_11);
adc1_config_channel_atten(channel, atten);
adc_chars = calloc(1, sizeof(esp_adc_cal_characteristics_t));
esp_adc_cal_characterize(ADC_UNIT_1, atten, ADC_WIDTH_BIT_12, DEFAULT_VREF, adc_chars);
int val = adc1_get_raw(channel);
return val;
}

2
arduino/cores/esp32/wiring_analog.h
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@@ -28,7 +28,7 @@ extern "C" {
extern void analogWrite(uint32_t pin, uint32_t value);
extern int analogRead(uint32_t pin);
extern int analogRead(uint32_t pin, uint32_t atten);
#ifdef __cplusplus
}

4
main/CommandHandler.cpp
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@@ -1010,11 +1010,13 @@ int setDigitalRead(const uint8_t command[], uint8_t response[])
int setAnalogRead(const uint8_t command[], uint8_t response[])
{
uint8_t pin = command[4];
uint8_t atten = command[6];
int value = digitalRead(pin);
int value = analogRead(pin, atten);
response[2] = 1; // number of parameters
response[3] = sizeof(value); // parameter 1 length
memcpy(&response[4], &value, sizeof(value));
return 5 + sizeof(value);