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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2023-11-23 Chushicheng first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#include "drv_adc.h"
#include "hal/adc_types.h"
#ifdef SOC_ESP32_C6
#include "soc/apb_saradc_struct.h"
#include "soc/pcr_struct.h"
#include "soc/adc_channel.h"
#include "driver/gpio.h"
#include "driver/rtc_io.h"
#include "esp_rom_sys.h"
#include "esp_private/periph_ctrl.h"
#include "esp_private/sar_periph_ctrl.h"
#include "hal/adc_ll.h"
#else
#include "esp_adc/adc_oneshot.h"
#include "esp_adc/adc_cali.h"
#include "esp_adc/adc_cali_scheme.h"
#endif
/* ESP-IDF v6.1 renamed the maximum attenuation for the ESP32-C3 from
* 11 dB to 12 dB (ADC_ATTEN_DB_11 -> ADC_ATTEN_DB_12). Both are enum
* constants, so the preprocessor cannot tell them apart with #ifdef; use the
* IDF version macro to keep 5.1 builds working. */
#include "esp_idf_version.h"
#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(6, 0, 0)
#define ADC_DEV_ATTEN ADC_ATTEN_DB_12
#else
#define ADC_DEV_ATTEN ADC_ATTEN_DB_11
#endif
#ifdef BSP_USING_ADC
#define DBG_TAG "drv.adc"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#define EXAMPLE_READ_LEN 256
#define GET_UNIT(x) ((x >> 3) & 0x1)
/* esp i2c dirver class */
struct esp_adc
{
struct rt_adc_ops ops;
struct rt_adc_device adc_device;
rt_uint8_t adc_id;
#ifndef SOC_ESP32_C6
adc_oneshot_unit_handle_t handle;
adc_cali_handle_t cali_handle;
rt_uint8_t do_calibration1;
#endif
};
static struct esp_adc_config adc_config[] = {
#ifdef BSP_USING_ADC1
{
.adc_id = ADC_UNIT_1,
.device_name = "adc1",
},
#endif
};
static struct esp_adc esp_adc_obj[sizeof(adc_config) / sizeof(adc_config[0])];
#ifdef SOC_ESP32_C6
static struct rt_mutex adc_lock;
#endif
static rt_err_t _adc_enabled(struct rt_adc_device *device, rt_int8_t channel, rt_bool_t enabled)
{
#ifdef SOC_ESP32_C6
static int adc_on;
int gpio;
if (channel < 0 || channel > 6)
{
return -RT_EINVAL;
}
if (rt_mutex_take(&adc_lock, RT_WAITING_FOREVER) != RT_EOK)
{
return -RT_ERROR;
}
gpio = channel;
if (!enabled)
{
if (adc_on > 0)
{
adc_on--;
sar_periph_ctrl_adc_oneshot_power_release();
#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(6, 0, 0)
adc_ll_enable_bus_clock(false);
#else
periph_module_disable(PERIPH_SARADC_MODULE);
#endif
}
rt_mutex_release(&adc_lock);
return RT_EOK;
}
#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(6, 0, 0)
adc_ll_enable_bus_clock(true);
adc_ll_reset_register();
#else
periph_module_enable(PERIPH_SARADC_MODULE);
#endif
sar_periph_ctrl_adc_oneshot_power_acquire();
adc_on++;
PCR.saradc_conf.saradc_clk_en = 1;
PCR.saradc_conf.saradc_rst_en = 0;
PCR.saradc_clkm_conf.saradc_clkm_en = 1;
PCR.saradc_clkm_conf.saradc_clkm_sel = 0;
PCR.saradc_clkm_conf.saradc_clkm_div_num = 15;
PCR.saradc_clkm_conf.saradc_clkm_div_a = 0;
PCR.saradc_clkm_conf.saradc_clkm_div_b = 1;
APB_SARADC.saradc_ctrl.saradc_saradc_sar_clk_gated = 1;
APB_SARADC.saradc_ctrl.saradc_saradc_sar_clk_div = 1;
APB_SARADC.saradc_ctrl.saradc_saradc_xpd_sar_force = 3;
gpio_config_t cfg = {
.pin_bit_mask = 1ULL << gpio,
.mode = GPIO_MODE_DISABLE,
.pull_up_en = GPIO_PULLUP_DISABLE,
.pull_down_en = GPIO_PULLDOWN_DISABLE,
.intr_type = GPIO_INTR_DISABLE,
};
gpio_config(&cfg);
rtc_gpio_init(gpio);
rtc_gpio_set_direction(gpio, RTC_GPIO_MODE_DISABLED);
rtc_gpio_pulldown_dis(gpio);
rtc_gpio_pullup_dis(gpio);
APB_SARADC.saradc_onetime_sample.saradc_saradc_onetime_atten = 3;
APB_SARADC.saradc_onetime_sample.saradc_saradc_onetime_channel = channel;
rt_mutex_release(&adc_lock);
return RT_EOK;
#else
struct esp_adc *_adc = rt_container_of(device, struct esp_adc, adc_device);
if (enabled)
{
//-------------ADC Init---------------//
adc_oneshot_unit_init_cfg_t init_config = {
.unit_id = _adc->adc_id,
};
ESP_ERROR_CHECK(adc_oneshot_new_unit(&init_config, &_adc->handle));
//-------------ADC Config---------------//
adc_oneshot_chan_cfg_t config = {
.bitwidth = ADC_BITWIDTH_DEFAULT,
.atten = ADC_DEV_ATTEN,
};
ESP_ERROR_CHECK(adc_oneshot_config_channel(_adc->handle, channel, &config));
#if ADC_CALI_SCHEME_CURVE_FITTING_SUPPORTED
adc_cali_curve_fitting_config_t cali_config = {
.unit_id = _adc->adc_id,
.atten = ADC_DEV_ATTEN,
.bitwidth = ADC_BITWIDTH_DEFAULT,
};
if (adc_cali_create_scheme_curve_fitting(&cali_config, &_adc->cali_handle) == ESP_OK)
{
_adc->do_calibration1 = 1;
}
else
#endif
{
_adc->do_calibration1 = 0;
}
// _adc->do_calibration1 = example_adc_calibration_init(_adc->adc_id, ADC_ATTEN_DB_11, &_adc->cali_handle);
}
else
{
ESP_ERROR_CHECK(adc_oneshot_del_unit(_adc->handle));
#if ADC_CALI_SCHEME_CURVE_FITTING_SUPPORTED
if (_adc->do_calibration1)
{
ESP_ERROR_CHECK(adc_cali_delete_scheme_curve_fitting(_adc->cali_handle));
}
#endif
}
return RT_EOK;
#endif
}
static rt_err_t _adc_get_value(struct rt_adc_device *device, rt_int8_t channel, rt_uint32_t *value)
{
RT_ASSERT(device != RT_NULL);
RT_ASSERT(value != RT_NULL);
#ifdef SOC_ESP32_C6
int i;
int done = 0;
uint32_t raw_pin = 0;
rt_err_t result;
if (rt_mutex_take(&adc_lock, RT_WAITING_FOREVER) != RT_EOK)
{
return -RT_ERROR;
}
APB_SARADC.saradc_onetime_sample.saradc_saradc_onetime_channel = channel;
APB_SARADC.saradc_int_clr.saradc_apb_saradc1_done_int_clr = 1;
APB_SARADC.saradc_onetime_sample.saradc_saradc1_onetime_sample = 0;
APB_SARADC.saradc_onetime_sample.saradc_saradc2_onetime_sample = 0;
APB_SARADC.saradc_onetime_sample.saradc_saradc1_onetime_sample = 1;
APB_SARADC.saradc_onetime_sample.saradc_saradc_onetime_start = 0;
esp_rom_delay_us(5);
APB_SARADC.saradc_onetime_sample.saradc_saradc_onetime_start = 1;
for (i = 0; i < 1000; i++)
{
if (APB_SARADC.saradc_int_raw.saradc_apb_saradc1_done_int_raw)
{
done = 1;
break;
}
esp_rom_delay_us(2);
}
if (done)
{
raw_pin = APB_SARADC.saradc_sar1data_status.saradc_apb_saradc1_data & 0xfff;
}
APB_SARADC.saradc_onetime_sample.saradc_saradc1_onetime_sample = 0;
APB_SARADC.saradc_onetime_sample.saradc_saradc_onetime_start = 0;
if (!done)
{
result = -RT_ETIMEOUT;
}
else
{
*value = raw_pin;
result = RT_EOK;
}
rt_mutex_release(&adc_lock);
return result;
#else
rt_uint32_t adc_raw = 0;
struct esp_adc *_adc = rt_container_of(device, struct esp_adc, adc_device);
ESP_ERROR_CHECK(adc_oneshot_read(_adc->handle, channel, &adc_raw));
if (_adc->do_calibration1)
{
ESP_ERROR_CHECK(adc_cali_raw_to_voltage(_adc->cali_handle, adc_raw, value));
}
else
{
*value = adc_raw;
}
return RT_EOK;
#endif
}
static const struct rt_adc_ops esp_adc_ops = {
.enabled = _adc_enabled,
.convert = _adc_get_value,
.get_resolution = RT_NULL,
.get_vref = RT_NULL,
};
int rt_hw_adc_init(void)
{
int result = RT_EOK;
#ifdef SOC_ESP32_C6
if (rt_mutex_init(&adc_lock, "adc", RT_IPC_FLAG_PRIO) != RT_EOK)
{
return -RT_ERROR;
}
#endif
for (rt_size_t i = 0; i < sizeof(esp_adc_obj) / sizeof(struct esp_adc); i++)
{
esp_adc_obj[i].adc_id = adc_config[i].adc_id;
/* register ADC device */
if (rt_hw_adc_register(&esp_adc_obj[i].adc_device, adc_config[i].device_name, &esp_adc_ops, &adc_config[i]) == RT_EOK)
{
LOG_D("%s init success", adc_config[i].device_name);
}
else
{
LOG_E("%s register failed", adc_config[i].device_name);
result = -RT_ERROR;
}
}
return result;
}
INIT_BOARD_EXPORT(rt_hw_adc_init);
#endif /* BSP_USING_ADC */
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