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esp-idf/components/driver/esp32c3/adc.c
Michael (XIAO Xufeng) 90fc3e7030 adc: update the monitor and filter in the HAL on C3 
On C3 ADC has no enable bit for monitor and filter. However we can use context variables to implement one
2021-01-25 04:51:40 +00:00

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// Copyright 2016-2020 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <esp_types.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include "sdkconfig.h"
#include "esp_intr_alloc.h"
#include "esp_log.h"
#include "sys/lock.h"
#include "freertos/FreeRTOS.h"
#include "freertos/semphr.h"
#include "freertos/timers.h"
#include "freertos/ringbuf.h"
#include "esp32c3/rom/ets_sys.h"
#include "driver/periph_ctrl.h"
#include "driver/gpio.h"
#include "driver/adc.h"
#include "hal/adc_types.h"
#include "hal/adc_hal.h"
#include "hal/dma_types.h"
#include "esp32c3/esp_efuse_rtc_calib.h"
#define ADC_CHECK_RET(fun_ret) ({ \
if (fun_ret != ESP_OK) { \
ESP_LOGE(ADC_TAG,"%s:%d\n",__FUNCTION__,__LINE__); \
return ESP_FAIL; \
} \
})
static const char *ADC_TAG = "ADC";
#define ADC_CHECK(a, str, ret_val) ({ \
if (!(a)) { \
ESP_LOGE(ADC_TAG,"%s:%d (%s):%s", __FILE__, __LINE__, __FUNCTION__, str); \
return (ret_val); \
} \
})
#define ADC_GET_IO_NUM(periph, channel) (adc_channel_io_map[periph][channel])
#define ADC_CHANNEL_CHECK(periph, channel) ADC_CHECK(channel < SOC_ADC_CHANNEL_NUM(periph), "ADC"#periph" channel error", ESP_ERR_INVALID_ARG)
extern portMUX_TYPE rtc_spinlock; //TODO: Will be placed in the appropriate position after the rtc module is finished.
#define ADC_ENTER_CRITICAL() portENTER_CRITICAL(&rtc_spinlock)
#define ADC_EXIT_CRITICAL() portEXIT_CRITICAL(&rtc_spinlock)
/*---------------------------------------------------------------
Digital Controller Context
---------------------------------------------------------------*/
/**
* 1. adc_digi_mutex: this mutex lock is used for ADC digital controller. On ESP32-C3, the ADC single read APIs (unit1 & unit2)
* and ADC DMA continuous read APIs share the ``apb_saradc_struct.h`` regs.
*
* 2. sar_adc_mutex: this mutex lock is used for SARADC2 module. On ESP32C-C3, the ADC single read APIs (unit2), ADC DMA
* continuous read APIs and WIFI share the SARADC2 analog IP.
*
* Sequence:
* Acquire: 1. sar_adc_mutex; 2. adc_digi_mutex;
* Release: 1. adc_digi_mutex; 2. sar_adc_mutex;
*/
static _lock_t adc_digi_mutex;
#define ADC_DIGI_LOCK_ACQUIRE() _lock_acquire(&adc_digi_mutex)
#define ADC_DIGI_LOCK_RELEASE() _lock_release(&adc_digi_mutex)
static _lock_t sar_adc2_mutex;
#define SAC_ADC2_LOCK_ACQUIRE() _lock_acquire(&sar_adc2_mutex)
#define SAC_ADC2_LOCK_RELEASE() _lock_release(&sar_adc2_mutex)
#define INTERNAL_BUF_NUM 5
#define IN_SUC_EOF_BIT GDMA_LL_EVENT_RX_SUC_EOF
typedef struct adc_digi_context_t {
intr_handle_t dma_intr_hdl; //MD interrupt handle
uint32_t bytes_between_intr; //bytes between in suc eof intr
uint8_t *rx_dma_buf; //dma buffer
adc_dma_hal_context_t hal_dma; //dma context (hal)
adc_dma_hal_config_t hal_dma_config; //dma config (hal)
RingbufHandle_t ringbuf_hdl; //RX ringbuffer handler
bool ringbuf_overflow_flag; //1: ringbuffer overflow
bool driver_start_flag; //1: driver is started; 0: driver is stoped
bool use_adc1; //1: ADC unit1 will be used; 0: ADC unit1 won't be used.
bool use_adc2; //1: ADC unit2 will be used; 0: ADC unit2 won't be used. This determines whether to acquire sar_adc2_mutex lock or not.
adc_atten_t adc1_atten; //Attenuation for ADC1. On this chip each ADC can only support one attenuation.
adc_atten_t adc2_atten; //Attenuation for ADC2. On this chip each ADC can only support one attenuation.
adc_digi_config_t digi_controller_config; //Digital Controller Configuration
} adc_digi_context_t;
static const char* ADC_DMA_TAG = "ADC_DMA:";
static adc_digi_context_t *s_adc_digi_ctx = NULL;
static uint32_t adc_get_calibration_offset(adc_ll_num_t adc_n, adc_channel_t chan, adc_atten_t atten);
/*---------------------------------------------------------------
ADC Continuous Read Mode (via DMA)
---------------------------------------------------------------*/
static void adc_dma_intr(void* arg);
static int8_t adc_digi_get_io_num(uint8_t adc_unit, uint8_t adc_channel)
{
return adc_channel_io_map[adc_unit][adc_channel];
}
static esp_err_t adc_digi_gpio_init(adc_unit_t adc_unit, uint16_t channel_mask)
{
esp_err_t ret = ESP_OK;
uint64_t gpio_mask = 0;
uint32_t n = 0;
int8_t io = 0;
while (channel_mask) {
if (channel_mask & 0x1) {
io = adc_digi_get_io_num(adc_unit, n);
if (io < 0) {
return ESP_ERR_INVALID_ARG;
}
gpio_mask |= BIT64(io);
}
channel_mask = channel_mask >> 1;
n++;
}
gpio_config_t cfg = {
.pin_bit_mask = gpio_mask,
.mode = GPIO_MODE_DISABLE,
};
ret = gpio_config(&cfg);
return ret;
}
esp_err_t adc_digi_initialize(const adc_digi_init_config_t *init_config)
{
esp_err_t ret = ESP_OK;
s_adc_digi_ctx = calloc(1, sizeof(adc_digi_context_t));
if (s_adc_digi_ctx == NULL) {
ret = ESP_ERR_NO_MEM;
goto cleanup;
}
ret = esp_intr_alloc(SOC_GDMA_ADC_INTR_SOURCE, 0, adc_dma_intr, (void *)s_adc_digi_ctx, &s_adc_digi_ctx->dma_intr_hdl);
if (ret != ESP_OK) {
goto cleanup;
}
//ringbuffer
s_adc_digi_ctx->ringbuf_hdl = xRingbufferCreate(init_config->max_store_buf_size, RINGBUF_TYPE_BYTEBUF);
if (!s_adc_digi_ctx->ringbuf_hdl) {
ret = ESP_ERR_NO_MEM;
goto cleanup;
}
//malloc internal buffer
s_adc_digi_ctx->bytes_between_intr = init_config->conv_num_each_intr;
s_adc_digi_ctx->rx_dma_buf = heap_caps_calloc(1, s_adc_digi_ctx->bytes_between_intr * INTERNAL_BUF_NUM, MALLOC_CAP_INTERNAL);
if (!s_adc_digi_ctx->rx_dma_buf) {
ret = ESP_ERR_NO_MEM;
goto cleanup;
}
//malloc dma descriptor
s_adc_digi_ctx->hal_dma_config.rx_desc = heap_caps_calloc(1, (sizeof(dma_descriptor_t)) * INTERNAL_BUF_NUM, MALLOC_CAP_DMA);
if (!s_adc_digi_ctx->hal_dma_config.rx_desc) {
ret = ESP_ERR_NO_MEM;
goto cleanup;
}
s_adc_digi_ctx->hal_dma_config.desc_max_num = INTERNAL_BUF_NUM;
s_adc_digi_ctx->hal_dma_config.dma_chan = init_config->dma_chan;
//malloc pattern table
s_adc_digi_ctx->digi_controller_config.adc_pattern = calloc(1, SOC_ADC_PATT_LEN_MAX * sizeof(adc_digi_pattern_table_t));
if (!s_adc_digi_ctx->digi_controller_config.adc_pattern) {
ret = ESP_ERR_NO_MEM;
goto cleanup;
}
if (init_config->adc1_chan_mask) {
ret = adc_digi_gpio_init(ADC_NUM_1, init_config->adc1_chan_mask);
if (ret != ESP_OK) {
goto cleanup;
}
}
if (init_config->adc2_chan_mask) {
ret = adc_digi_gpio_init(ADC_NUM_2, init_config->adc2_chan_mask);
if (ret != ESP_OK) {
goto cleanup;
}
}
periph_module_enable(PERIPH_SARADC_MODULE);
periph_module_enable(PERIPH_GDMA_MODULE);
return ret;
cleanup:
adc_digi_deinitialize();
return ret;
}
static IRAM_ATTR void adc_dma_intr(void *arg)
{
portBASE_TYPE taskAwoken = 0;
BaseType_t ret;
//clear the in suc eof interrupt
adc_hal_digi_clr_intr(&s_adc_digi_ctx->hal_dma, &s_adc_digi_ctx->hal_dma_config, IN_SUC_EOF_BIT);
while (s_adc_digi_ctx->hal_dma_config.cur_desc_ptr->dw0.owner == 0) {
dma_descriptor_t *current_desc = s_adc_digi_ctx->hal_dma_config.cur_desc_ptr;
ret = xRingbufferSendFromISR(s_adc_digi_ctx->ringbuf_hdl, current_desc->buffer, current_desc->dw0.length, &taskAwoken);
if (ret == pdFALSE) {
//ringbuffer overflow
s_adc_digi_ctx->ringbuf_overflow_flag = 1;
}
s_adc_digi_ctx->hal_dma_config.desc_cnt += 1;
//cycle the dma descriptor and buffers
s_adc_digi_ctx->hal_dma_config.cur_desc_ptr = s_adc_digi_ctx->hal_dma_config.cur_desc_ptr->next;
if (!s_adc_digi_ctx->hal_dma_config.cur_desc_ptr) {
break;
}
}
if (!s_adc_digi_ctx->hal_dma_config.cur_desc_ptr) {
assert(s_adc_digi_ctx->hal_dma_config.desc_cnt == s_adc_digi_ctx->hal_dma_config.desc_max_num);
//reset the current descriptor status
s_adc_digi_ctx->hal_dma_config.cur_desc_ptr = s_adc_digi_ctx->hal_dma_config.rx_desc;
s_adc_digi_ctx->hal_dma_config.desc_cnt = 0;
//start next turns of dma operation
adc_hal_digi_dma_multi_descriptor(&s_adc_digi_ctx->hal_dma_config, s_adc_digi_ctx->rx_dma_buf, s_adc_digi_ctx->bytes_between_intr, s_adc_digi_ctx->hal_dma_config.desc_max_num);
adc_hal_digi_rxdma_start(&s_adc_digi_ctx->hal_dma, &s_adc_digi_ctx->hal_dma_config);
}
if(taskAwoken == pdTRUE) {
portYIELD_FROM_ISR();
}
}
esp_err_t adc_digi_start(void)
{
if (s_adc_digi_ctx->driver_start_flag != 0) {
ESP_LOGE(ADC_TAG, "The driver is already started");
return ESP_ERR_INVALID_STATE;
}
//reset flags
s_adc_digi_ctx->ringbuf_overflow_flag = 0;
s_adc_digi_ctx->driver_start_flag = 1;
//When using SARADC2 module, this task needs to be protected from WIFI
if (s_adc_digi_ctx->use_adc2) {
SAC_ADC2_LOCK_ACQUIRE();
}
ADC_DIGI_LOCK_ACQUIRE();
adc_arbiter_t config = ADC_ARBITER_CONFIG_DEFAULT();
adc_hal_init();
if (s_adc_digi_ctx->use_adc1) {
uint32_t cal_val = adc_get_calibration_offset(ADC_NUM_1, ADC_CHANNEL_MAX, s_adc_digi_ctx->adc1_atten);
adc_hal_set_calibration_param(ADC_NUM_1, cal_val);
}
if (s_adc_digi_ctx->use_adc2) {
uint32_t cal_val = adc_get_calibration_offset(ADC_NUM_2, ADC_CHANNEL_MAX, s_adc_digi_ctx->adc2_atten);
adc_hal_set_calibration_param(ADC_NUM_2, cal_val);
}
adc_hal_arbiter_config(&config);
adc_hal_digi_init(&s_adc_digi_ctx->hal_dma, &s_adc_digi_ctx->hal_dma_config);
adc_hal_digi_controller_config(&s_adc_digi_ctx->digi_controller_config);
//create dma descriptors
adc_hal_digi_dma_multi_descriptor(&s_adc_digi_ctx->hal_dma_config, s_adc_digi_ctx->rx_dma_buf, s_adc_digi_ctx->bytes_between_intr, s_adc_digi_ctx->hal_dma_config.desc_max_num);
adc_hal_digi_set_eof_num(&s_adc_digi_ctx->hal_dma, &s_adc_digi_ctx->hal_dma_config, (s_adc_digi_ctx->bytes_between_intr)/4);
//set the current descriptor pointer
s_adc_digi_ctx->hal_dma_config.cur_desc_ptr = s_adc_digi_ctx->hal_dma_config.rx_desc;
s_adc_digi_ctx->hal_dma_config.desc_cnt = 0;
//enable in suc eof intr
adc_hal_digi_ena_intr(&s_adc_digi_ctx->hal_dma, &s_adc_digi_ctx->hal_dma_config, IN_SUC_EOF_BIT);
//start ADC
adc_hal_digi_start(&s_adc_digi_ctx->hal_dma, &s_adc_digi_ctx->hal_dma_config);
//start DMA
adc_hal_digi_rxdma_start(&s_adc_digi_ctx->hal_dma, &s_adc_digi_ctx->hal_dma_config);
return ESP_OK;
}
esp_err_t adc_digi_stop(void)
{
if (s_adc_digi_ctx->driver_start_flag != 1) {
ESP_LOGE(ADC_TAG, "The driver is already stopped");
return ESP_ERR_INVALID_STATE;
}
s_adc_digi_ctx->driver_start_flag = 0;
//disable the in suc eof intrrupt
adc_hal_digi_dis_intr(&s_adc_digi_ctx->hal_dma, &s_adc_digi_ctx->hal_dma_config, IN_SUC_EOF_BIT);
//clear the in suc eof interrupt
adc_hal_digi_clr_intr(&s_adc_digi_ctx->hal_dma, &s_adc_digi_ctx->hal_dma_config, IN_SUC_EOF_BIT);
//stop DMA
adc_hal_digi_rxdma_stop(&s_adc_digi_ctx->hal_dma, &s_adc_digi_ctx->hal_dma_config);
//stop ADC
adc_hal_digi_stop(&s_adc_digi_ctx->hal_dma, &s_adc_digi_ctx->hal_dma_config);
adc_hal_digi_deinit();
ADC_DIGI_LOCK_RELEASE();
//When using SARADC2 module, this task needs to be protected from WIFI
if (s_adc_digi_ctx->use_adc2) {
SAC_ADC2_LOCK_RELEASE();
}
return ESP_OK;
}
esp_err_t adc_digi_read_bytes(uint8_t *buf, uint32_t length_max, uint32_t *out_length, uint32_t timeout_ms)
{
TickType_t ticks_to_wait;
esp_err_t ret = ESP_OK;
uint8_t *data = NULL;
size_t size = 0;
ticks_to_wait = timeout_ms / portTICK_RATE_MS;
if (timeout_ms == ADC_MAX_DELAY) {
ticks_to_wait = portMAX_DELAY;
}
data = xRingbufferReceiveUpTo(s_adc_digi_ctx->ringbuf_hdl, &size, ticks_to_wait, length_max);
if (!data) {
ESP_LOGV(ADC_DMA_TAG, "No data, increase timeout or reduce conv_num_each_intr");
ret = ESP_ERR_TIMEOUT;
*out_length = 0;
return ret;
}
memcpy(buf, data, size);
vRingbufferReturnItem(s_adc_digi_ctx->ringbuf_hdl, data);
assert((size % 4) == 0);
*out_length = size;
if (s_adc_digi_ctx->ringbuf_overflow_flag) {
ret = ESP_ERR_INVALID_STATE;
}
return ret;
}
esp_err_t adc_digi_deinitialize(void)
{
if (!s_adc_digi_ctx) {
return ESP_ERR_INVALID_STATE;
}
if (s_adc_digi_ctx->driver_start_flag != 0) {
ESP_LOGE(ADC_TAG, "The driver is not stopped");
return ESP_ERR_INVALID_STATE;
}
if (s_adc_digi_ctx->dma_intr_hdl) {
esp_intr_free(s_adc_digi_ctx->dma_intr_hdl);
}
if(s_adc_digi_ctx->ringbuf_hdl) {
vRingbufferDelete(s_adc_digi_ctx->ringbuf_hdl);
s_adc_digi_ctx->ringbuf_hdl = NULL;
}
free(s_adc_digi_ctx->rx_dma_buf);
free(s_adc_digi_ctx->hal_dma_config.rx_desc);
free(s_adc_digi_ctx->digi_controller_config.adc_pattern);
free(s_adc_digi_ctx);
s_adc_digi_ctx = NULL;
periph_module_disable(PERIPH_SARADC_MODULE);
periph_module_disable(PERIPH_GDMA_MODULE);
return ESP_OK;
}
/*---------------------------------------------------------------
ADC Single Read Mode
---------------------------------------------------------------*/
static adc_atten_t s_atten1_single[ADC1_CHANNEL_MAX]; //Array saving attenuate of each channel of ADC1, used by single read API
static adc_atten_t s_atten2_single[ADC2_CHANNEL_MAX]; //Array saving attenuate of each channel of ADC2, used by single read API
esp_err_t adc1_config_width(adc_bits_width_t width_bit)
{
//On ESP32C3, the data width is always 12-bits.
if (width_bit != ADC_WIDTH_BIT_12) {
return ESP_ERR_INVALID_ARG;
}
return ESP_OK;
}
esp_err_t adc1_config_channel_atten(adc1_channel_t channel, adc_atten_t atten)
{
ADC_CHANNEL_CHECK(ADC_NUM_1, channel);
ADC_CHECK(atten < ADC_ATTEN_MAX, "ADC Atten Err", ESP_ERR_INVALID_ARG);
esp_err_t ret = ESP_OK;
s_atten1_single[channel] = atten;
ret = adc_digi_gpio_init(ADC_NUM_1, BIT(channel));
return ret;
}
int adc1_get_raw(adc1_channel_t channel)
{
int raw_out = 0;
adc_digi_config_t dig_cfg = {
.conv_limit_en = 0,
.conv_limit_num = 250,
.interval = 40,
.dig_clk.use_apll = 0,
.dig_clk.div_num = 15,
.dig_clk.div_a = 0,
.dig_clk.div_b = 1,
};
ADC_DIGI_LOCK_ACQUIRE();
periph_module_enable(PERIPH_SARADC_MODULE);
adc_atten_t atten = s_atten1_single[channel];
uint32_t cal_val = adc_get_calibration_offset(ADC_NUM_1, channel, atten);
adc_hal_set_calibration_param(ADC_NUM_1, cal_val);
adc_hal_digi_controller_config(&dig_cfg);
adc_hal_intr_clear(ADC_EVENT_ADC1_DONE);
adc_hal_onetime_channel(ADC_NUM_1, channel);
adc_hal_set_onetime_atten(atten);
//Trigger single read.
adc_hal_adc1_onetime_sample_enable(true);
adc_hal_onetime_start(&dig_cfg);
while (!adc_hal_intr_get_raw(ADC_EVENT_ADC1_DONE));
adc_hal_intr_clear(ADC_EVENT_ADC1_DONE);
adc_hal_adc1_onetime_sample_enable(false);
adc_hal_single_read(ADC_NUM_1, &raw_out);
adc_hal_digi_deinit();
periph_module_disable(PERIPH_SARADC_MODULE);
ADC_DIGI_LOCK_RELEASE();
return raw_out;
}
esp_err_t adc2_config_channel_atten(adc2_channel_t channel, adc_atten_t atten)
{
ADC_CHANNEL_CHECK(ADC_NUM_2, channel);
ADC_CHECK(atten <= ADC_ATTEN_11db, "ADC2 Atten Err", ESP_ERR_INVALID_ARG);
esp_err_t ret = ESP_OK;
s_atten2_single[channel] = atten;
ret = adc_digi_gpio_init(ADC_NUM_2, BIT(channel));
return ret;
}
esp_err_t adc2_get_raw(adc2_channel_t channel, adc_bits_width_t width_bit, int *raw_out)
{
//On ESP32C3, the data width is always 12-bits.
if (width_bit != ADC_WIDTH_BIT_12) {
return ESP_ERR_INVALID_ARG;
}
esp_err_t ret = ESP_OK;
adc_digi_config_t dig_cfg = {
.conv_limit_en = 0,
.conv_limit_num = 250,
.interval = 40,
.dig_clk.use_apll = 0,
.dig_clk.div_num = 15,
.dig_clk.div_a = 0,
.dig_clk.div_b = 1,
};
SAC_ADC2_LOCK_ACQUIRE();
ADC_DIGI_LOCK_ACQUIRE();
periph_module_enable(PERIPH_SARADC_MODULE);
adc_atten_t atten = s_atten2_single[channel];
uint32_t cal_val = adc_get_calibration_offset(ADC_NUM_2, channel, atten);
adc_hal_set_calibration_param(ADC_NUM_2, cal_val);
adc_hal_digi_controller_config(&dig_cfg);
adc_hal_intr_clear(ADC_EVENT_ADC2_DONE);
adc_hal_onetime_channel(ADC_NUM_2, channel);
adc_hal_set_onetime_atten(atten);
//Trigger single read.
adc_hal_adc2_onetime_sample_enable(true);
adc_hal_onetime_start(&dig_cfg);
while (!adc_hal_intr_get_raw(ADC_EVENT_ADC2_DONE));
adc_hal_intr_clear(ADC_EVENT_ADC2_DONE);
adc_hal_adc2_onetime_sample_enable(false);
ret = adc_hal_single_read(ADC_NUM_2, raw_out);
if (ret != ESP_OK) {
return ret;
}
adc_hal_digi_deinit();
periph_module_disable(PERIPH_SARADC_MODULE);
ADC_DIGI_LOCK_RELEASE();
SAC_ADC2_LOCK_RELEASE();
return ESP_OK;
}
/*---------------------------------------------------------------
Digital controller setting
---------------------------------------------------------------*/
esp_err_t adc_digi_controller_config(const adc_digi_config_t *config)
{
if (!s_adc_digi_ctx) {
return ESP_ERR_INVALID_STATE;
}
s_adc_digi_ctx->digi_controller_config.conv_limit_en = config->conv_limit_en;
s_adc_digi_ctx->digi_controller_config.conv_limit_num = config->conv_limit_num;
s_adc_digi_ctx->digi_controller_config.adc_pattern_len = config->adc_pattern_len;
s_adc_digi_ctx->digi_controller_config.interval = config->interval;
s_adc_digi_ctx->digi_controller_config.dig_clk = config-> dig_clk;
s_adc_digi_ctx->digi_controller_config.dma_eof_num = config->dma_eof_num;
memcpy(s_adc_digi_ctx->digi_controller_config.adc_pattern, config->adc_pattern, config->adc_pattern_len * sizeof(adc_digi_pattern_table_t));
//See whether ADC2 will be used or not. If yes, the ``sar_adc2_mutex`` should be acquired in the continuous read driver
s_adc_digi_ctx->adc1_atten = ADC_ATTEN_MAX;
s_adc_digi_ctx->adc2_atten = ADC_ATTEN_MAX;
s_adc_digi_ctx->use_adc1 = 0;
s_adc_digi_ctx->use_adc2 = 0;
for (int i = 0; i < config->adc_pattern_len; i++) {
const adc_digi_pattern_table_t* pat = &config->adc_pattern[i];
if (pat->unit == ADC_NUM_1) {
s_adc_digi_ctx->use_adc1 = 1;
if (s_adc_digi_ctx->adc1_atten == ADC_ATTEN_MAX) {
s_adc_digi_ctx->adc1_atten = pat->atten;
} else if (s_adc_digi_ctx->adc1_atten != pat->atten) {
return ESP_ERR_INVALID_ARG;
}
} else if (pat->unit == ADC_NUM_2) {
s_adc_digi_ctx->use_adc2 = 1;
if (s_adc_digi_ctx->adc2_atten == ADC_ATTEN_MAX) {
s_adc_digi_ctx->adc2_atten = pat->atten;
} else if (s_adc_digi_ctx->adc2_atten != pat->atten) {
return ESP_ERR_INVALID_ARG;
}
}
}
return ESP_OK;
}
esp_err_t adc_arbiter_config(adc_unit_t adc_unit, adc_arbiter_t *config)
{
if (adc_unit & ADC_UNIT_1) {
return ESP_ERR_NOT_SUPPORTED;
}
ADC_ENTER_CRITICAL();
adc_hal_arbiter_config(config);
ADC_EXIT_CRITICAL();
return ESP_OK;
}
/**
* @brief Set ADC module controller.
* There are five SAR ADC controllers:
* Two digital controller: Continuous conversion mode (DMA). High performance with multiple channel scan modes;
* Two RTC controller: Single conversion modes (Polling). For low power purpose working during deep sleep;
* the other is dedicated for Power detect (PWDET / PKDET), Only support ADC2.
*
* @note Only ADC2 support arbiter to switch controllers automatically. Access to the ADC is based on the priority of the controller.
* @note For ADC1, Controller access is mutually exclusive.
*
* @param adc_unit ADC unit.
* @param ctrl ADC controller, Refer to `adc_controller_t`.
*
* @return
* - ESP_OK Success
*/
esp_err_t adc_set_controller(adc_unit_t adc_unit, adc_controller_t ctrl)
{
adc_arbiter_t config = {0};
adc_arbiter_t cfg = ADC_ARBITER_CONFIG_DEFAULT();
if (adc_unit & ADC_UNIT_1) {
adc_hal_set_controller(ADC_NUM_1, ctrl);
}
if (adc_unit & ADC_UNIT_2) {
adc_hal_set_controller(ADC_NUM_2, ctrl);
switch (ctrl) {
case ADC2_CTRL_FORCE_PWDET:
config.pwdet_pri = 2;
config.mode = ADC_ARB_MODE_SHIELD;
adc_hal_arbiter_config(&config);
adc_hal_set_controller(ADC_NUM_2, ADC2_CTRL_PWDET);
break;
case ADC2_CTRL_FORCE_RTC:
config.rtc_pri = 2;
config.mode = ADC_ARB_MODE_SHIELD;
adc_hal_arbiter_config(&config);
adc_hal_set_controller(ADC_NUM_2, ADC_CTRL_RTC);
break;
case ADC2_CTRL_FORCE_DIG:
config.dig_pri = 2;
config.mode = ADC_ARB_MODE_SHIELD;
adc_hal_arbiter_config(&config);
adc_hal_set_controller(ADC_NUM_2, ADC_CTRL_DIG);
break;
default:
adc_hal_arbiter_config(&cfg);
break;
}
}
return ESP_OK;
}
/**
* @brief Reset FSM of adc digital controller.
*
* @return
* - ESP_OK Success
*/
esp_err_t adc_digi_reset(void)
{
ADC_ENTER_CRITICAL();
adc_hal_digi_reset();
adc_hal_digi_clear_pattern_table(ADC_NUM_1);
adc_hal_digi_clear_pattern_table(ADC_NUM_2);
ADC_EXIT_CRITICAL();
return ESP_OK;
}
/*************************************/
/* Digital controller filter setting */
/*************************************/
esp_err_t adc_digi_filter_reset(adc_digi_filter_idx_t idx)
{
ADC_ENTER_CRITICAL();
adc_hal_digi_filter_reset(idx);
ADC_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t adc_digi_filter_set_config(adc_digi_filter_idx_t idx, adc_digi_filter_t *config)
{
ADC_ENTER_CRITICAL();
adc_hal_digi_filter_set_factor(idx, config);
ADC_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t adc_digi_filter_get_config(adc_digi_filter_idx_t idx, adc_digi_filter_t *config)
{
ADC_ENTER_CRITICAL();
adc_hal_digi_filter_get_factor(idx, config);
ADC_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t adc_digi_filter_enable(adc_digi_filter_idx_t idx, bool enable)
{
ADC_ENTER_CRITICAL();
adc_hal_digi_filter_enable(idx, enable);
ADC_EXIT_CRITICAL();
return ESP_OK;
}
/**************************************/
/* Digital controller monitor setting */
/**************************************/
esp_err_t adc_digi_monitor_set_config(adc_digi_monitor_idx_t idx, adc_digi_monitor_t *config)
{
ADC_ENTER_CRITICAL();
adc_hal_digi_monitor_config(idx, config);
ADC_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t adc_digi_monitor_enable(adc_digi_monitor_idx_t idx, bool enable)
{
ADC_ENTER_CRITICAL();
adc_hal_digi_monitor_enable(idx, enable);
ADC_EXIT_CRITICAL();
return ESP_OK;
}
/**************************************/
/* Digital controller intr setting */
/**************************************/
esp_err_t adc_digi_intr_enable(adc_unit_t adc_unit, adc_digi_intr_t intr_mask)
{
ADC_ENTER_CRITICAL();
if (adc_unit & ADC_UNIT_1) {
adc_hal_digi_intr_enable(ADC_NUM_1, intr_mask);
}
if (adc_unit & ADC_UNIT_2) {
adc_hal_digi_intr_enable(ADC_NUM_2, intr_mask);
}
ADC_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t adc_digi_intr_disable(adc_unit_t adc_unit, adc_digi_intr_t intr_mask)
{
ADC_ENTER_CRITICAL();
if (adc_unit & ADC_UNIT_1) {
adc_hal_digi_intr_disable(ADC_NUM_1, intr_mask);
}
if (adc_unit & ADC_UNIT_2) {
adc_hal_digi_intr_disable(ADC_NUM_2, intr_mask);
}
ADC_EXIT_CRITICAL();
return ESP_OK;
}
esp_err_t adc_digi_intr_clear(adc_unit_t adc_unit, adc_digi_intr_t intr_mask)
{
ADC_ENTER_CRITICAL();
if (adc_unit & ADC_UNIT_1) {
adc_hal_digi_intr_clear(ADC_NUM_1, intr_mask);
}
if (adc_unit & ADC_UNIT_2) {
adc_hal_digi_intr_clear(ADC_NUM_2, intr_mask);
}
ADC_EXIT_CRITICAL();
return ESP_OK;
}
uint32_t adc_digi_intr_get_status(adc_unit_t adc_unit)
{
uint32_t ret = 0;
ADC_ENTER_CRITICAL();
if (adc_unit & ADC_UNIT_1) {
ret = adc_hal_digi_get_intr_status(ADC_NUM_1);
}
if (adc_unit & ADC_UNIT_2) {
ret = adc_hal_digi_get_intr_status(ADC_NUM_2);
}
ADC_EXIT_CRITICAL();
return ret;
}
static bool s_isr_registered = 0;
static intr_handle_t s_adc_isr_handle = NULL;
esp_err_t adc_digi_isr_register(void (*fn)(void *), void *arg, int intr_alloc_flags)
{
ADC_CHECK((fn != NULL), "Parameter error", ESP_ERR_INVALID_ARG);
ADC_CHECK(s_isr_registered == 0, "ADC ISR have installed, can not install again", ESP_FAIL);
esp_err_t ret = esp_intr_alloc(ETS_APB_ADC_INTR_SOURCE, intr_alloc_flags, fn, arg, &s_adc_isr_handle);
if (ret == ESP_OK) {
s_isr_registered = 1;
}
return ret;
}
esp_err_t adc_digi_isr_deregister(void)
{
esp_err_t ret = ESP_FAIL;
if (s_isr_registered) {
ret = esp_intr_free(s_adc_isr_handle);
if (ret == ESP_OK) {
s_isr_registered = 0;
}
}
return ret;
}
/*---------------------------------------------------------------
RTC controller setting
---------------------------------------------------------------*/
static uint16_t s_adc_cali_param[ADC_ATTEN_MAX] = {};
//NOTE: according to calibration version, different types of lock may be taken during the process:
// 1. Semaphore when reading efuse
// 2. Lock (Spinlock, or Mutex) if we actually do ADC calibration in the future
//This function shoudn't be called inside critical section or ISR
static uint32_t adc_get_calibration_offset(adc_ll_num_t adc_n, adc_channel_t channel, adc_atten_t atten)
{
const bool no_cal = false;
if (s_adc_cali_param[atten]) {
return (uint32_t)s_adc_cali_param[atten];
}
if (no_cal) {
return 0; //indicating failure
}
// check if we can fetch the values from eFuse.
int version = esp_efuse_rtc_calib_get_ver();
assert(version == 1);
uint32_t init_code = esp_efuse_rtc_calib_get_init_code(version, atten);
ESP_LOGD(ADC_TAG, "Calib(V%d) ADC%d atten=%d: %04X", version, adc_n, atten, init_code);
s_adc_cali_param[atten] = init_code;
return init_code;
}
// Internal function to calibrate PWDET for WiFi
esp_err_t adc_cal_offset(adc_ll_num_t adc_n, adc_channel_t channel, adc_atten_t atten)
{
uint32_t cal_val = adc_get_calibration_offset(adc_n, channel, atten);
ADC_ENTER_CRITICAL();
adc_hal_set_calibration_param(adc_n, cal_val);
ADC_EXIT_CRITICAL();
return ESP_OK;
}
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