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esp-idf/components/hal/adc_hal.c

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C
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/*
* SPDX-FileCopyrightText: 2019-2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <sys/param.h>
#include "sdkconfig.h"
#include "hal/adc_hal.h"
#include "hal/assert.h"
#include "soc/lldesc.h"
#include "soc/soc_caps.h"
#if CONFIG_IDF_TARGET_ESP32
//ADC utilises I2S0 DMA on ESP32
#include "hal/i2s_hal.h"
#include "hal/i2s_types.h"
#include "soc/i2s_struct.h"
//ESP32 ADC uses the DMA through I2S. The I2S needs to be configured.
#define I2S_BASE_CLK (160 * 1000 * 1000)
#define SAMPLE_BITS 16
#define ADC_LL_CLKM_DIV_NUM_DEFAULT 2
#define ADC_LL_CLKM_DIV_B_DEFAULT 0
#define ADC_LL_CLKM_DIV_A_DEFAULT 1
i2s_dev_t *adc_hal_i2s_dev = I2S_LL_GET_HW(ADC_HAL_DMA_I2S_HOST);
#define adc_ll_digi_dma_set_eof_num(num) i2s_ll_rx_set_eof_num(adc_hal_i2s_dev, (num) * 4)
#define adc_ll_digi_reset() do { \
i2s_ll_rx_reset(adc_hal_i2s_dev); \
i2s_ll_rx_reset_fifo(adc_hal_i2s_dev); \
} while (0)
#define adc_ll_digi_trigger_enable() i2s_ll_rx_start(adc_hal_i2s_dev)
#define adc_ll_digi_trigger_disable() i2s_ll_rx_stop(adc_hal_i2s_dev)
#define adc_ll_digi_dma_enable() adc_ll_digi_set_data_source(1) //Will this influence I2S0
#define adc_ll_digi_dma_disable() adc_ll_digi_set_data_source(0)
#endif
void adc_hal_dma_ctx_config(adc_hal_dma_ctx_t *hal, const adc_hal_dma_config_t *config)
{
hal->desc_dummy_head.next = hal->rx_desc;
hal->eof_desc_num = config->eof_desc_num;
hal->eof_step = config->eof_step;
hal->eof_num = config->eof_num;
}
void adc_hal_digi_init(adc_hal_dma_ctx_t *hal)
{
// Set internal FSM wait time, fixed value.
adc_ll_digi_set_fsm_time(ADC_LL_FSM_RSTB_WAIT_DEFAULT, ADC_LL_FSM_START_WAIT_DEFAULT,
ADC_LL_FSM_STANDBY_WAIT_DEFAULT);
adc_ll_set_sample_cycle(ADC_LL_SAMPLE_CYCLE_DEFAULT);
adc_hal_pwdet_set_cct(ADC_LL_PWDET_CCT_DEFAULT);
adc_ll_digi_output_invert(ADC_UNIT_1, ADC_LL_DIGI_DATA_INVERT_DEFAULT(ADC_UNIT_1));
adc_ll_digi_output_invert(ADC_UNIT_2, ADC_LL_DIGI_DATA_INVERT_DEFAULT(ADC_UNIT_2));
adc_ll_digi_set_clk_div(ADC_LL_DIGI_SAR_CLK_DIV_DEFAULT);
adc_ll_digi_dma_set_eof_num(hal->eof_num);
#if CONFIG_IDF_TARGET_ESP32
i2s_ll_rx_set_sample_bit(adc_hal_i2s_dev, SAMPLE_BITS, SAMPLE_BITS);
i2s_ll_rx_enable_mono_mode(adc_hal_i2s_dev, 1);
i2s_ll_rx_force_enable_fifo_mod(adc_hal_i2s_dev, 1);
i2s_ll_rx_enable_right_first(adc_hal_i2s_dev, false);
i2s_ll_rx_enable_msb_shift(adc_hal_i2s_dev, false);
i2s_ll_rx_set_ws_width(adc_hal_i2s_dev, 16);
i2s_ll_rx_select_std_slot(adc_hal_i2s_dev, I2S_STD_SLOT_LEFT, false);
i2s_ll_enable_builtin_adc_dac(adc_hal_i2s_dev, 1);
#endif
adc_oneshot_ll_disable_all_unit();
}
void adc_hal_digi_deinit()
{
#if ADC_LL_POWER_MANAGE_SUPPORTED
adc_ll_set_power_manage(ADC_UNIT_1, ADC_LL_POWER_SW_OFF);
adc_ll_set_power_manage(ADC_UNIT_2, ADC_LL_POWER_SW_OFF);
#endif
adc_ll_digi_trigger_disable();
adc_ll_digi_dma_disable();
adc_ll_digi_clear_pattern_table(ADC_UNIT_1);
adc_ll_digi_clear_pattern_table(ADC_UNIT_2);
adc_ll_digi_reset();
adc_ll_digi_controller_clk_disable();
}
/*---------------------------------------------------------------
DMA read
---------------------------------------------------------------*/
static adc_ll_digi_convert_mode_t get_convert_mode(adc_digi_convert_mode_t convert_mode)
{
#if CONFIG_IDF_TARGET_ESP32 || SOC_ADC_DIGI_CONTROLLER_NUM == 1
return ADC_LL_DIGI_CONV_ONLY_ADC1;
#elif (SOC_ADC_DIGI_CONTROLLER_NUM >= 2)
switch (convert_mode) {
case ADC_CONV_SINGLE_UNIT_1:
return ADC_LL_DIGI_CONV_ONLY_ADC1;
case ADC_CONV_SINGLE_UNIT_2:
return ADC_LL_DIGI_CONV_ONLY_ADC2;
case ADC_CONV_BOTH_UNIT:
return ADC_LL_DIGI_CONV_BOTH_UNIT;
case ADC_CONV_ALTER_UNIT:
return ADC_LL_DIGI_CONV_ALTER_UNIT;
default:
abort();
}
#endif
}
/**
* For esp32s2 and later chips
* - Set ADC digital controller clock division factor. The clock is divided from `APLL` or `APB` clock.
* Expression: controller_clk = APLL/APB * (div_num + div_a / div_b + 1).
* - Enable clock and select clock source for ADC digital controller.
* For esp32, use I2S clock
*/
static void adc_hal_digi_sample_freq_config(adc_hal_dma_ctx_t *hal, adc_continuous_clk_src_t clk_src, uint32_t clk_src_freq_hz, uint32_t sample_freq_hz)
{
#if !CONFIG_IDF_TARGET_ESP32
uint32_t interval = clk_src_freq_hz / (ADC_LL_CLKM_DIV_NUM_DEFAULT + ADC_LL_CLKM_DIV_A_DEFAULT / ADC_LL_CLKM_DIV_B_DEFAULT + 1) / 2 / sample_freq_hz;
//set sample interval
adc_ll_digi_set_trigger_interval(interval);
//Here we set the clock divider factor to make the digital clock to 5M Hz
adc_ll_digi_controller_clk_div(ADC_LL_CLKM_DIV_NUM_DEFAULT, ADC_LL_CLKM_DIV_B_DEFAULT, ADC_LL_CLKM_DIV_A_DEFAULT);
adc_ll_digi_clk_sel(clk_src);
#else
i2s_ll_rx_clk_set_src(adc_hal_i2s_dev, I2S_CLK_SRC_DEFAULT); /*!< Clock from PLL_D2_CLK(160M)*/
uint32_t bclk_div = 16;
uint32_t bclk = sample_freq_hz * 2;
uint32_t mclk = bclk * bclk_div;
hal_utils_clk_div_t mclk_div = {};
i2s_hal_calc_mclk_precise_division(I2S_BASE_CLK, mclk, &mclk_div);
i2s_ll_rx_set_mclk(adc_hal_i2s_dev, &mclk_div);
i2s_ll_rx_set_bck_div_num(adc_hal_i2s_dev, bclk_div);
#endif
}
void adc_hal_digi_controller_config(adc_hal_dma_ctx_t *hal, const adc_hal_digi_ctrlr_cfg_t *cfg)
{
#if (SOC_ADC_DIGI_CONTROLLER_NUM == 1)
//Only one pattern table, this variable is for readability
const int pattern_both = 0;
adc_ll_digi_clear_pattern_table(pattern_both);
adc_ll_digi_set_pattern_table_len(pattern_both, cfg->adc_pattern_len);
for (int i = 0; i < cfg->adc_pattern_len; i++) {
adc_ll_digi_set_pattern_table(pattern_both, i, cfg->adc_pattern[i]);
}
#if ADC_LL_POWER_MANAGE_SUPPORTED
adc_ll_set_power_manage(0, ADC_LL_POWER_SW_ON);
#endif
#elif (SOC_ADC_DIGI_CONTROLLER_NUM >= 2)
uint32_t adc1_pattern_idx = 0;
uint32_t adc2_pattern_idx = 0;
adc_ll_digi_clear_pattern_table(ADC_UNIT_1);
adc_ll_digi_clear_pattern_table(ADC_UNIT_2);
for (int i = 0; i < cfg->adc_pattern_len; i++) {
if (cfg->adc_pattern[i].unit == ADC_UNIT_1) {
#if ADC_LL_POWER_MANAGE_SUPPORTED
adc_ll_set_power_manage(ADC_UNIT_1, ADC_LL_POWER_SW_ON);
#endif
adc_ll_digi_set_pattern_table(ADC_UNIT_1, adc1_pattern_idx, cfg->adc_pattern[i]);
adc1_pattern_idx++;
} else if (cfg->adc_pattern[i].unit == ADC_UNIT_2) {
#if ADC_LL_POWER_MANAGE_SUPPORTED
adc_ll_set_power_manage(ADC_UNIT_2, ADC_LL_POWER_SW_ON);
#endif
adc_ll_digi_set_pattern_table(ADC_UNIT_2, adc2_pattern_idx, cfg->adc_pattern[i]);
adc2_pattern_idx++;
} else {
abort();
}
}
adc_ll_digi_set_pattern_table_len(ADC_UNIT_1, adc1_pattern_idx);
adc_ll_digi_set_pattern_table_len(ADC_UNIT_2, adc2_pattern_idx);
#endif
adc_ll_digi_convert_limit_enable(ADC_LL_DEFAULT_CONV_LIMIT_EN);
adc_ll_digi_set_convert_limit_num(ADC_LL_DEFAULT_CONV_LIMIT_NUM);
adc_ll_digi_set_convert_mode(get_convert_mode(cfg->conv_mode));
//clock and sample frequency
adc_hal_digi_sample_freq_config(hal, cfg->clk_src, cfg->clk_src_freq_hz, cfg->sample_freq_hz);
}
void adc_hal_digi_dma_link(adc_hal_dma_ctx_t *hal, uint8_t *data_buf)
{
dma_descriptor_t *desc = hal->rx_desc;
uint32_t per_eof_size = hal->eof_num * SOC_ADC_DIGI_DATA_BYTES_PER_CONV;
uint32_t eof_step = hal->eof_step;
uint32_t eof_num = hal->eof_desc_num;
HAL_ASSERT(((uint32_t)data_buf % 4) == 0);
HAL_ASSERT((per_eof_size % 4) == 0);
uint32_t n = 0;
dma_descriptor_t *desc_head = desc;
hal->cur_desc_ptr = &hal->desc_dummy_head;
while (eof_num--) {
uint32_t eof_size = per_eof_size;
for (int i = 0; i < eof_step; i++) {
uint32_t this_len = eof_size;
if (this_len > DMA_DESCRIPTOR_BUFFER_MAX_SIZE_4B_ALIGNED) {
this_len = DMA_DESCRIPTOR_BUFFER_MAX_SIZE_4B_ALIGNED;
}
desc[n] = (dma_descriptor_t) {
.dw0.size = this_len,
.dw0.length = 0,
.dw0.suc_eof = 0,
.dw0.owner = 1,
.buffer = data_buf,
.next = &desc[n+1]
};
eof_size -= this_len;
data_buf += this_len;
n++;
}
}
desc[n-1].next = desc_head;
}
adc_hal_dma_desc_status_t adc_hal_get_reading_result(adc_hal_dma_ctx_t *hal, const intptr_t eof_desc_addr, uint8_t **buffer, uint32_t *len)
{
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;
}
uint8_t *buffer_start = NULL;
uint32_t eof_len = 0;
dma_descriptor_t *eof_desc = hal->cur_desc_ptr;
//Find the eof list start
eof_desc = eof_desc->next;
eof_desc->dw0.owner = 1;
buffer_start = eof_desc->buffer;
eof_len += eof_desc->dw0.length;
if ((intptr_t)eof_desc == eof_desc_addr) {
goto valid;
}
//Find the eof list end
for (int i = 1; i < hal->eof_step; i++) {
eof_desc = eof_desc->next;
eof_desc->dw0.owner = 1;
eof_len += eof_desc->dw0.length;
if ((intptr_t)eof_desc == eof_desc_addr) {
goto valid;
}
}
valid:
hal->cur_desc_ptr = eof_desc;
*buffer = buffer_start;
*len = eof_len;
return ADC_HAL_DMA_DESC_VALID;
}
void adc_hal_digi_enable(bool enable)
{
if (enable) {
adc_ll_digi_trigger_enable();
} else {
adc_ll_digi_trigger_disable();
}
}
void adc_hal_digi_connect(bool enable)
{
if (enable) {
adc_ll_digi_dma_enable();
} else {
adc_ll_digi_dma_disable();
}
}
void adc_hal_digi_reset(void)
{
adc_ll_digi_reset();
}
#if ADC_LL_WORKAROUND_CLEAR_EOF_COUNTER
void adc_hal_digi_clr_eof(void)
{
adc_ll_digi_dma_clr_eof();
}
#endif
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