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esp-idf/components/hal/adc_hal.c

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// Copyright 2019-2020 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 <sys/param.h>
#include "soc/soc_caps.h"
#include "hal/adc_hal.h"
#include "hal/adc_hal_conf.h"
#include "hal/assert.h"
#include "sdkconfig.h"
#if CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32H2
#include "soc/gdma_channel.h"
#include "soc/soc.h"
#include "esp_rom_sys.h"
typedef enum {
ADC_EVENT_ADC1_DONE = BIT(0),
ADC_EVENT_ADC2_DONE = BIT(1),
} adc_hal_event_t;
#endif
void adc_hal_init(void)
{
// Set internal FSM wait time, fixed value.
adc_ll_digi_set_fsm_time(SOC_ADC_FSM_RSTB_WAIT_DEFAULT, SOC_ADC_FSM_START_WAIT_DEFAULT,
SOC_ADC_FSM_STANDBY_WAIT_DEFAULT);
adc_ll_set_sample_cycle(ADC_FSM_SAMPLE_CYCLE_DEFAULT);
adc_hal_pwdet_set_cct(SOC_ADC_PWDET_CCT_DEFAULT);
adc_ll_digi_output_invert(ADC_NUM_1, SOC_ADC_DIGI_DATA_INVERT_DEFAULT(ADC_NUM_1));
adc_ll_digi_output_invert(ADC_NUM_2, SOC_ADC_DIGI_DATA_INVERT_DEFAULT(ADC_NUM_2));
adc_ll_digi_set_clk_div(SOC_ADC_DIGI_SAR_CLK_DIV_DEFAULT);
}
#if SOC_ADC_ARBITER_SUPPORTED
void adc_hal_arbiter_config(adc_arbiter_t *config)
{
adc_ll_set_arbiter_work_mode(config->mode);
adc_ll_set_arbiter_priority(config->rtc_pri, config->dig_pri, config->pwdet_pri);
}
#endif
/*---------------------------------------------------------------
ADC calibration setting
---------------------------------------------------------------*/
#if SOC_ADC_HW_CALIBRATION_V1
void adc_hal_calibration_init(adc_ll_num_t adc_n)
{
adc_ll_calibration_init(adc_n);
}
static uint32_t s_previous_init_code[SOC_ADC_PERIPH_NUM] = {-1, -1};
void adc_hal_set_calibration_param(adc_ll_num_t adc_n, uint32_t param)
{
if (param != s_previous_init_code[adc_n]) {
adc_ll_set_calibration_param(adc_n, param);
s_previous_init_code[adc_n] = param;
}
}
#if CONFIG_IDF_TARGET_ESP32S2
static void cal_setup(adc_ll_num_t adc_n, adc_channel_t channel, adc_atten_t atten, bool internal_gnd)
{
adc_hal_set_controller(adc_n, ADC_CTRL_RTC); //Set controller
/* Enable/disable internal connect GND (for calibration). */
if (internal_gnd) {
adc_ll_rtc_disable_channel(adc_n);
adc_ll_set_atten(adc_n, 0, atten); // Note: when disable all channel, HW auto select channel0 atten param.
} else {
adc_ll_rtc_enable_channel(adc_n, channel);
adc_ll_set_atten(adc_n, channel, atten);
}
}
static uint32_t read_cal_channel(adc_ll_num_t adc_n, int channel)
{
adc_ll_rtc_start_convert(adc_n, channel);
while (adc_ll_rtc_convert_is_done(adc_n) != true);
return (uint32_t)adc_ll_rtc_get_convert_value(adc_n);
}
#elif CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32H2
static void cal_setup(adc_ll_num_t adc_n, adc_channel_t channel, adc_atten_t atten, bool internal_gnd)
{
adc_ll_onetime_sample_enable(ADC_NUM_1, false);
adc_ll_onetime_sample_enable(ADC_NUM_2, false);
/* Enable/disable internal connect GND (for calibration). */
if (internal_gnd) {
const int esp32c3_invalid_chan = (adc_n == ADC_NUM_1) ? 0xF : 0x1;
adc_ll_onetime_set_channel(adc_n, esp32c3_invalid_chan);
} else {
adc_ll_onetime_set_channel(adc_n, channel);
}
adc_ll_onetime_set_atten(atten);
adc_ll_onetime_sample_enable(adc_n, true);
}
static uint32_t read_cal_channel(adc_ll_num_t adc_n, int channel)
{
adc_ll_intr_clear(ADC_LL_INTR_ADC1_DONE | ADC_LL_INTR_ADC2_DONE);
adc_ll_onetime_start(false);
esp_rom_delay_us(5);
adc_ll_onetime_start(true);
while (!adc_ll_intr_get_raw(ADC_LL_INTR_ADC1_DONE | ADC_LL_INTR_ADC2_DONE));
uint32_t read_val = -1;
if (adc_n == ADC_NUM_1) {
read_val = adc_ll_adc1_read();
} else if (adc_n == ADC_NUM_2) {
read_val = adc_ll_adc2_read();
if (adc_ll_analysis_raw_data(adc_n, read_val)) {
return -1;
}
}
return read_val;
}
#endif //CONFIG_IDF_TARGET_*
#define ADC_HAL_CAL_TIMES (10)
#define ADC_HAL_CAL_OFFSET_RANGE (4096)
uint32_t adc_hal_self_calibration(adc_ll_num_t adc_n, adc_channel_t channel, adc_atten_t atten, bool internal_gnd)
{
if (adc_n == ADC_NUM_2) {
adc_arbiter_t config = ADC_ARBITER_CONFIG_DEFAULT();
adc_hal_arbiter_config(&config);
}
cal_setup(adc_n, channel, atten, internal_gnd);
adc_ll_calibration_prepare(adc_n, channel, internal_gnd);
uint32_t code_list[ADC_HAL_CAL_TIMES] = {0};
uint32_t code_sum = 0;
uint32_t code_h = 0;
uint32_t code_l = 0;
uint32_t chk_code = 0;
for (uint8_t rpt = 0 ; rpt < ADC_HAL_CAL_TIMES ; rpt ++) {
code_h = ADC_HAL_CAL_OFFSET_RANGE;
code_l = 0;
chk_code = (code_h + code_l) / 2;
adc_ll_set_calibration_param(adc_n, chk_code);
uint32_t self_cal = read_cal_channel(adc_n, channel);
while (code_h - code_l > 1) {
if (self_cal == 0) {
code_h = chk_code;
} else {
code_l = chk_code;
}
chk_code = (code_h + code_l) / 2;
adc_ll_set_calibration_param(adc_n, chk_code);
self_cal = read_cal_channel(adc_n, channel);
if ((code_h - code_l == 1)) {
chk_code += 1;
adc_ll_set_calibration_param(adc_n, chk_code);
self_cal = read_cal_channel(adc_n, channel);
}
}
code_list[rpt] = chk_code;
code_sum += chk_code;
}
code_l = code_list[0];
code_h = code_list[0];
for (uint8_t i = 0 ; i < ADC_HAL_CAL_TIMES ; i++) {
code_l = MIN(code_l, code_list[i]);
code_h = MAX(code_h, code_list[i]);
}
chk_code = code_h + code_l;
uint32_t ret = ((code_sum - chk_code) % (ADC_HAL_CAL_TIMES - 2) < 4)
? (code_sum - chk_code) / (ADC_HAL_CAL_TIMES - 2)
: (code_sum - chk_code) / (ADC_HAL_CAL_TIMES - 2) + 1;
adc_ll_calibration_finish(adc_n);
return ret;
}
#endif //SOC_ADC_HW_CALIBRATION_V1
#if CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32H2
//This feature is currently supported on ESP32C3, will be supported on other chips soon
/*---------------------------------------------------------------
DMA setting
---------------------------------------------------------------*/
void adc_hal_context_config(adc_hal_context_t *hal, const adc_hal_config_t *config)
{
hal->dev = &GDMA;
hal->desc_dummy_head.next = hal->rx_desc;
hal->desc_max_num = config->desc_max_num;
hal->dma_chan = config->dma_chan;
hal->eof_num = config->eof_num;
}
void adc_hal_digi_init(adc_hal_context_t *hal)
{
gdma_ll_rx_clear_interrupt_status(hal->dev, hal->dma_chan, UINT32_MAX);
gdma_ll_rx_enable_interrupt(hal->dev, hal->dma_chan, GDMA_LL_EVENT_RX_SUC_EOF, true);
adc_ll_digi_dma_set_eof_num(hal->eof_num);
adc_ll_onetime_sample_enable(ADC_NUM_1, false);
adc_ll_onetime_sample_enable(ADC_NUM_2, false);
}
void adc_hal_fifo_reset(adc_hal_context_t *hal)
{
adc_ll_digi_reset();
gdma_ll_rx_reset_channel(hal->dev, hal->dma_chan);
}
static void adc_hal_digi_dma_link_descriptors(dma_descriptor_t *desc, uint8_t *data_buf, uint32_t size, uint32_t num)
{
HAL_ASSERT(((uint32_t)data_buf % 4) == 0);
HAL_ASSERT((size % 4) == 0);
uint32_t n = 0;
while (num--) {
desc[n].dw0.size = size;
desc[n].dw0.suc_eof = 0;
desc[n].dw0.owner = 1;
desc[n].buffer = data_buf;
desc[n].next = &desc[n + 1];
data_buf += size;
n++;
}
desc[n - 1].next = NULL;
}
void adc_hal_digi_rxdma_start(adc_hal_context_t *hal, uint8_t *data_buf)
{
//reset the current descriptor address
hal->cur_desc_ptr = &hal->desc_dummy_head;
adc_hal_digi_dma_link_descriptors(hal->rx_desc, data_buf, hal->eof_num * ADC_HAL_DATA_LEN_PER_CONV, hal->desc_max_num);
gdma_ll_rx_set_desc_addr(hal->dev, hal->dma_chan, (uint32_t)hal->rx_desc);
gdma_ll_rx_start(hal->dev, hal->dma_chan);
}
void adc_hal_digi_start(adc_hal_context_t *hal)
{
//the ADC data will be sent to the DMA
adc_ll_digi_dma_enable();
//enable sar adc timer
adc_ll_digi_trigger_enable();
}
adc_hal_dma_desc_status_t adc_hal_get_reading_result(adc_hal_context_t *hal, const intptr_t eof_desc_addr, dma_descriptor_t **cur_desc)
{
HAL_ASSERT(hal->cur_desc_ptr);
if (!hal->cur_desc_ptr->next) {
return ADC_HAL_DMA_DESC_NULL;
}
if ((intptr_t)hal->cur_desc_ptr == eof_desc_addr) {
return ADC_HAL_DMA_DESC_WAITING;
}
hal->cur_desc_ptr = hal->cur_desc_ptr->next;
*cur_desc = hal->cur_desc_ptr;
return ADC_HAL_DMA_DESC_VALID;
}
void adc_hal_digi_rxdma_stop(adc_hal_context_t *hal)
{
gdma_ll_rx_stop(hal->dev, hal->dma_chan);
}
void adc_hal_digi_clr_intr(adc_hal_context_t *hal, uint32_t mask)
{
gdma_ll_rx_clear_interrupt_status(hal->dev, hal->dma_chan, mask);
}
void adc_hal_digi_dis_intr(adc_hal_context_t *hal, uint32_t mask)
{
gdma_ll_rx_enable_interrupt(hal->dev, hal->dma_chan, mask, false);
}
void adc_hal_digi_stop(adc_hal_context_t *hal)
{
//Set to 0: the ADC data won't be sent to the DMA
adc_ll_digi_dma_disable();
//disable sar adc timer
adc_ll_digi_trigger_disable();
}
/*---------------------------------------------------------------
Single Read
---------------------------------------------------------------*/
//--------------------INTR-------------------------------//
static adc_ll_intr_t get_event_intr(adc_hal_event_t event)
{
adc_ll_intr_t intr_mask = 0;
if (event & ADC_EVENT_ADC1_DONE) {
intr_mask |= ADC_LL_INTR_ADC1_DONE;
}
if (event & ADC_EVENT_ADC2_DONE) {
intr_mask |= ADC_LL_INTR_ADC2_DONE;
}
return intr_mask;
}
static void adc_hal_intr_clear(adc_hal_event_t event)
{
adc_ll_intr_clear(get_event_intr(event));
}
static bool adc_hal_intr_get_raw(adc_hal_event_t event)
{
return adc_ll_intr_get_raw(get_event_intr(event));
}
//--------------------Single Read-------------------------------//
static void adc_hal_onetime_start(void)
{
/**
* There is a hardware limitation. If the APB clock frequency is high, the step of this reg signal: ``onetime_start`` may not be captured by the
* ADC digital controller (when its clock frequency is too slow). A rough estimate for this step should be at least 3 ADC digital controller
* clock cycle.
*
* This limitation will be removed in hardware future versions.
*
*/
uint32_t digi_clk = APB_CLK_FREQ / (ADC_LL_CLKM_DIV_NUM_DEFAULT + ADC_LL_CLKM_DIV_A_DEFAULT / ADC_LL_CLKM_DIV_B_DEFAULT + 1);
//Convert frequency to time (us). Since decimals are removed by this division operation. Add 1 here in case of the fact that delay is not enough.
uint32_t delay = (1000 * 1000) / digi_clk + 1;
//3 ADC digital controller clock cycle
delay = delay * 3;
//This coefficient (8) is got from test. When digi_clk is not smaller than ``APB_CLK_FREQ/8``, no delay is needed.
if (digi_clk >= APB_CLK_FREQ / 8) {
delay = 0;
}
adc_ll_onetime_start(false);
esp_rom_delay_us(delay);
adc_ll_onetime_start(true);
//No need to delay here. Becuase if the start signal is not seen, there won't be a done intr.
}
static esp_err_t adc_hal_single_read(adc_ll_num_t adc_n, int *out_raw)
{
if (adc_n == ADC_NUM_1) {
*out_raw = adc_ll_adc1_read();
} else if (adc_n == ADC_NUM_2) {
*out_raw = adc_ll_adc2_read();
if (adc_ll_analysis_raw_data(adc_n, *out_raw)) {
return ESP_ERR_INVALID_STATE;
}
}
return ESP_OK;
}
esp_err_t adc_hal_convert(adc_ll_num_t adc_n, int channel, int *out_raw)
{
esp_err_t ret;
adc_hal_event_t event;
if (adc_n == ADC_NUM_1) {
event = ADC_EVENT_ADC1_DONE;
} else {
event = ADC_EVENT_ADC2_DONE;
}
adc_hal_intr_clear(event);
adc_ll_onetime_sample_enable(ADC_NUM_1, false);
adc_ll_onetime_sample_enable(ADC_NUM_2, false);
adc_ll_onetime_sample_enable(adc_n, true);
adc_ll_onetime_set_channel(adc_n, channel);
//Trigger single read.
adc_hal_onetime_start();
while (!adc_hal_intr_get_raw(event));
ret = adc_hal_single_read(adc_n, out_raw);
//HW workaround: when enabling periph clock, this should be false
adc_ll_onetime_sample_enable(adc_n, false);
return ret;
}
#else // !CONFIG_IDF_TARGET_ESP32C3 && !CONFIG_IDF_TARGET_ESP32H2
esp_err_t adc_hal_convert(adc_ll_num_t adc_n, int channel, int *out_raw)
{
adc_ll_rtc_enable_channel(adc_n, channel);
adc_ll_rtc_start_convert(adc_n, channel);
while (adc_ll_rtc_convert_is_done(adc_n) != true);
*out_raw = adc_ll_rtc_get_convert_value(adc_n);
if ((int)adc_ll_rtc_analysis_raw_data(adc_n, (uint16_t)(*out_raw))) {
return ESP_ERR_INVALID_STATE;
}
return ESP_OK;
}
#endif //#if CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32C3
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