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esp32s_adc_driver.cpp
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esp32s_adc_driver.cpp
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#include "esp32_adc_driver.h"
#if defined(ESP_H) && defined(ARDUINO_ARCH_ESP32) && defined(SOC_MCPWM_SUPPORTED) && (defined(CONFIG_IDF_TARGET_ESP32S2) || defined(CONFIG_IDF_TARGET_ESP32S3))
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "rom/ets_sys.h"
#include "esp_attr.h"
//#include "esp_intr.h" // deprecated
#include "esp_intr_alloc.h"
#include "soc/rtc_io_reg.h"
#include "soc/rtc_cntl_reg.h"
#include "soc/sens_reg.h"
static uint8_t __analogAttenuation = 3;//11db
static uint8_t __analogWidth = 3;//12 bits
static uint8_t __analogCycles = 8;
static uint8_t __analogSamples = 0;//1 sample
static uint8_t __analogClockDiv = 1;
// Width of returned answer ()
static uint8_t __analogReturnedWidth = 12;
void __analogSetWidth(uint8_t bits){
if(bits < 9){
bits = 9;
} else if(bits > 12){
bits = 12;
}
__analogReturnedWidth = bits;
__analogWidth = bits - 9;
// SET_PERI_REG_BITS(SENS_SAR_START_FORCE_REG, SENS_SAR1_BIT_WIDTH, __analogWidth, SENS_SAR1_BIT_WIDTH_S);
// SET_PERI_REG_BITS(SENS_SAR_READER1_CTRL_REG, SENS_SAR1_SAMPLE_BIT, __analogWidth, SENS_SAR1_SAMPLE_BIT_S);
// SET_PERI_REG_BITS(SENS_SAR_START_FORCE_REG, SENS_SAR2_BIT_WIDTH, __analogWidth, SENS_SAR2_BIT_WIDTH_S);
// SET_PERI_REG_BITS(SENS_SAR_READER2_CTRL_REG, SENS_SAR2_SAMPLE_BIT, __analogWidth, SENS_SAR2_SAMPLE_BIT_S);
}
void __analogSetCycles(uint8_t cycles){
__analogCycles = cycles;
// SET_PERI_REG_BITS(SENS_SAR_READER1_CTRL_REG, SENS_SAR1_SAMPLE_CYCLE, __analogCycles, SENS_SAR1_SAMPLE_CYCLE_S);
// SET_PERI_REG_BITS(SENS_SAR_READER2_CTRL_REG, SENS_SAR2_SAMPLE_CYCLE, __analogCycles, SENS_SAR2_SAMPLE_CYCLE_S);
}
void __analogSetSamples(uint8_t samples){
if(!samples){
return;
}
__analogSamples = samples - 1;
SET_PERI_REG_BITS(SENS_SAR_READER1_CTRL_REG, SENS_SAR1_SAMPLE_NUM, __analogSamples, SENS_SAR1_SAMPLE_NUM_S);
SET_PERI_REG_BITS(SENS_SAR_READER2_CTRL_REG, SENS_SAR2_SAMPLE_NUM, __analogSamples, SENS_SAR2_SAMPLE_NUM_S);
}
void __analogSetClockDiv(uint8_t clockDiv){
if(!clockDiv){
return;
}
__analogClockDiv = clockDiv;
SET_PERI_REG_BITS(SENS_SAR_READER1_CTRL_REG, SENS_SAR1_CLK_DIV, __analogClockDiv, SENS_SAR1_CLK_DIV_S);
SET_PERI_REG_BITS(SENS_SAR_READER2_CTRL_REG, SENS_SAR2_CLK_DIV, __analogClockDiv, SENS_SAR2_CLK_DIV_S);
}
void __analogSetAttenuation(uint8_t attenuation)
{
__analogAttenuation = attenuation & 3;
uint32_t att_data = 0;
int i = 10;
while(i--){
att_data |= __analogAttenuation << (i * 2);
}
WRITE_PERI_REG(SENS_SAR_ATTEN1_REG, att_data & 0xFFFF);//ADC1 has 8 channels
WRITE_PERI_REG(SENS_SAR_ATTEN2_REG, att_data);
}
void IRAM_ATTR __analogInit(){
static bool initialized = false;
if(initialized){
return;
}
__analogSetAttenuation(__analogAttenuation);
__analogSetCycles(__analogCycles);
__analogSetSamples(__analogSamples + 1);//in samples
__analogSetClockDiv(__analogClockDiv);
__analogSetWidth(__analogWidth + 9);//in bits
SET_PERI_REG_MASK(SENS_SAR_READER1_CTRL_REG, SENS_SAR1_DATA_INV);
SET_PERI_REG_MASK(SENS_SAR_READER2_CTRL_REG, SENS_SAR2_DATA_INV);
SET_PERI_REG_MASK(SENS_SAR_MEAS1_CTRL2_REG, SENS_MEAS1_START_FORCE_M); //SAR ADC1 controller (in RTC) is started by SW
SET_PERI_REG_MASK(SENS_SAR_MEAS1_CTRL2_REG, SENS_SAR1_EN_PAD_FORCE_M); //SAR ADC1 pad enable bitmap is controlled by SW
SET_PERI_REG_MASK(SENS_SAR_MEAS2_CTRL2_REG, SENS_MEAS2_START_FORCE_M); //SAR ADC2 controller (in RTC) is started by SW
SET_PERI_REG_MASK(SENS_SAR_MEAS2_CTRL2_REG, SENS_SAR2_EN_PAD_FORCE_M); //SAR ADC2 pad enable bitmap is controlled by SW
CLEAR_PERI_REG_MASK(SENS_SAR_POWER_XPD_SAR_REG, SENS_FORCE_XPD_SAR_M); //force XPD_SAR=0, use XPD_FSM
SET_PERI_REG_BITS(SENS_SAR_POWER_XPD_SAR_REG, SENS_FORCE_XPD_AMP, 0x2, SENS_FORCE_XPD_AMP_S); //force XPD_AMP=0
CLEAR_PERI_REG_MASK(SENS_SAR_AMP_CTRL3_REG, 0xfff << SENS_AMP_RST_FB_FSM_S); //clear FSM
SET_PERI_REG_BITS(SENS_SAR_AMP_CTRL1_REG, SENS_SAR_AMP_WAIT1, 0x1, SENS_SAR_AMP_WAIT1_S);
SET_PERI_REG_BITS(SENS_SAR_AMP_CTRL1_REG, SENS_SAR_AMP_WAIT2, 0x1, SENS_SAR_AMP_WAIT2_S);
SET_PERI_REG_BITS(SENS_SAR_POWER_XPD_SAR_REG, SENS_SAR_AMP_WAIT3, 0x1, SENS_SAR_AMP_WAIT3_S);
while (GET_PERI_REG_BITS2(SENS_SAR_SLAVE_ADDR1_REG, 0x7, SENS_SARADC_MEAS_STATUS_S) != 0); //wait det_fsm==
initialized = true;
}
void __analogSetPinAttenuation(uint8_t pin, uint8_t attenuation)
{
int8_t channel = digitalPinToAnalogChannel(pin);
if(channel < 0 || attenuation > 3){
return ;
}
__analogInit();
if(channel > 7){
SET_PERI_REG_BITS(SENS_SAR_ATTEN2_REG, 3, attenuation, ((channel - 10) * 2));
} else {
SET_PERI_REG_BITS(SENS_SAR_ATTEN1_REG, 3, attenuation, (channel * 2));
}
}
bool IRAM_ATTR __adcAttachPin(uint8_t pin){
int8_t channel = digitalPinToAnalogChannel(pin);
if(channel < 0){
return false;//not adc pin
}
int8_t pad = digitalPinToTouchChannel(pin);
if(pad >= 0){
uint32_t touch = READ_PERI_REG(SENS_SAR_TOUCH_CONF_REG);
if(touch & (1 << pad)){
touch &= ~((1 << (pad + SENS_TOUCH_OUTEN_S)));
WRITE_PERI_REG(SENS_SAR_TOUCH_CONF_REG, touch);
}
} else if(pin == 25){
CLEAR_PERI_REG_MASK(RTC_IO_PAD_DAC1_REG, RTC_IO_PDAC1_XPD_DAC | RTC_IO_PDAC1_DAC_XPD_FORCE); //stop dac1
} else if(pin == 26){
CLEAR_PERI_REG_MASK(RTC_IO_PAD_DAC2_REG, RTC_IO_PDAC2_XPD_DAC | RTC_IO_PDAC2_DAC_XPD_FORCE); //stop dac2
}
pinMode(pin, ANALOG);
__analogInit();
return true;
}
bool IRAM_ATTR __adcStart(uint8_t pin){
int8_t channel = digitalPinToAnalogChannel(pin);
if(channel < 0){
return false;//not adc pin
}
if(channel > 9){
channel -= 10;
CLEAR_PERI_REG_MASK(SENS_SAR_MEAS2_CTRL2_REG, SENS_MEAS2_START_SAR_M);
SET_PERI_REG_BITS(SENS_SAR_MEAS2_CTRL2_REG, SENS_SAR2_EN_PAD, (1 << channel), SENS_SAR2_EN_PAD_S);
SET_PERI_REG_MASK(SENS_SAR_MEAS2_CTRL2_REG, SENS_MEAS2_START_SAR_M);
} else {
CLEAR_PERI_REG_MASK(SENS_SAR_MEAS1_CTRL2_REG, SENS_MEAS1_START_SAR_M);
SET_PERI_REG_BITS(SENS_SAR_MEAS1_CTRL2_REG, SENS_SAR1_EN_PAD, (1 << channel), SENS_SAR1_EN_PAD_S);
SET_PERI_REG_MASK(SENS_SAR_MEAS1_CTRL2_REG, SENS_MEAS1_START_SAR_M);
}
return true;
}
bool IRAM_ATTR __adcBusy(uint8_t pin){
int8_t channel = digitalPinToAnalogChannel(pin);
if(channel < 0){
return false;//not adc pin
}
if(channel > 7){
return (GET_PERI_REG_MASK(SENS_SAR_MEAS2_CTRL2_REG, SENS_MEAS2_DONE_SAR) == 0);
}
return (GET_PERI_REG_MASK(SENS_SAR_MEAS1_CTRL2_REG, SENS_MEAS1_DONE_SAR) == 0);
}
uint16_t IRAM_ATTR __adcEnd(uint8_t pin)
{
uint16_t value = 0;
int8_t channel = digitalPinToAnalogChannel(pin);
if(channel < 0){
return 0;//not adc pin
}
if(channel > 7){
while (GET_PERI_REG_MASK(SENS_SAR_MEAS2_CTRL2_REG, SENS_MEAS2_DONE_SAR) == 0); //wait for conversion
value = GET_PERI_REG_BITS2(SENS_SAR_MEAS2_CTRL2_REG, SENS_MEAS2_DATA_SAR, SENS_MEAS2_DATA_SAR_S);
} else {
while (GET_PERI_REG_MASK(SENS_SAR_MEAS1_CTRL2_REG, SENS_MEAS1_DONE_SAR) == 0); //wait for conversion
value = GET_PERI_REG_BITS2(SENS_SAR_MEAS1_CTRL2_REG, SENS_MEAS1_DATA_SAR, SENS_MEAS1_DATA_SAR_S);
}
// Shift result if necessary
uint8_t from = __analogWidth + 9;
if (from == __analogReturnedWidth) {
return value;
}
if (from > __analogReturnedWidth) {
return value >> (from - __analogReturnedWidth);
}
return value << (__analogReturnedWidth - from);
}
void __analogReadResolution(uint8_t bits)
{
if(!bits || bits > 16){
return;
}
__analogSetWidth(bits); // hadware from 9 to 12
__analogReturnedWidth = bits; // software from 1 to 16
}
uint16_t IRAM_ATTR adcRead(uint8_t pin)
{
int8_t channel = digitalPinToAnalogChannel(pin);
if(channel < 0){
return false;//not adc pin
}
__analogInit();
if(channel > 9){
channel -= 10;
CLEAR_PERI_REG_MASK(SENS_SAR_MEAS2_CTRL2_REG, SENS_MEAS2_START_SAR_M);
SET_PERI_REG_BITS(SENS_SAR_MEAS2_CTRL2_REG, SENS_SAR2_EN_PAD, (1 << channel), SENS_SAR2_EN_PAD_S);
SET_PERI_REG_MASK(SENS_SAR_MEAS2_CTRL2_REG, SENS_MEAS2_START_SAR_M);
} else {
CLEAR_PERI_REG_MASK(SENS_SAR_MEAS1_CTRL2_REG, SENS_MEAS1_START_SAR_M);
SET_PERI_REG_BITS(SENS_SAR_MEAS1_CTRL2_REG, SENS_SAR1_EN_PAD, (1 << channel), SENS_SAR1_EN_PAD_S);
SET_PERI_REG_MASK(SENS_SAR_MEAS1_CTRL2_REG, SENS_MEAS1_START_SAR_M);
}
uint16_t value = 0;
if(channel > 7){
while (GET_PERI_REG_MASK(SENS_SAR_MEAS2_CTRL2_REG, SENS_MEAS2_DONE_SAR) == 0); //wait for conversion
value = GET_PERI_REG_BITS2(SENS_SAR_MEAS2_CTRL2_REG, SENS_MEAS2_DATA_SAR, SENS_MEAS2_DATA_SAR_S);
} else {
while (GET_PERI_REG_MASK(SENS_SAR_MEAS1_CTRL2_REG, SENS_MEAS1_DONE_SAR) == 0); //wait for conversion
value = GET_PERI_REG_BITS2(SENS_SAR_MEAS1_CTRL2_REG, SENS_MEAS1_DATA_SAR, SENS_MEAS1_DATA_SAR_S);
}
// Shift result if necessary
uint8_t from = __analogWidth + 9;
if (from == __analogReturnedWidth) {
return value;
}
if (from > __analogReturnedWidth) {
return value >> (from - __analogReturnedWidth);
}
return value << (__analogReturnedWidth - from);
}
#endif