rt-thread/bsp/gd32/libraries/gd32_drivers/drv_adc.c

/*
 * Copyright (c) 2006-2022, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author            Notes
 * 2021-02-25     iysheng           first version
 * 2022-04-13     wangh             adc init and convert bug fix
 */

#include <board.h>

#ifdef RT_USING_ADC

#define DBG_TAG "drv.adc"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>

#define MAX_EXTERN_ADC_CHANNEL  16

typedef struct
{
    struct rt_adc_device adc_dev;
    char name[8];
    rt_base_t adc_pins[16];
    void *private_data;
} gd32_adc_device;

static gd32_adc_device adc_devs[] = {
#ifdef BSP_USING_ADC0
    {
        .name = "adc0",
        .adc_pins = {
            GET_PIN(A, 0), GET_PIN(A, 1), GET_PIN(A, 2), GET_PIN(A, 3),
            GET_PIN(A, 4), GET_PIN(A, 5), GET_PIN(A, 6), GET_PIN(A, 7),
            GET_PIN(B, 0), GET_PIN(B, 1), GET_PIN(C, 0), GET_PIN(C, 1),
            GET_PIN(C, 2), GET_PIN(C, 3), GET_PIN(C, 4), GET_PIN(C, 5),
        },
        .private_data = (void *)ADC0,
    },
#endif

#ifdef BSP_USING_ADC1
    {
        .name = "adc1",
        .adc_pins = {
            GET_PIN(A, 0), GET_PIN(A, 1), GET_PIN(A, 2), GET_PIN(A, 3),
            GET_PIN(A, 4), GET_PIN(A, 5), GET_PIN(A, 6), GET_PIN(A, 7),
            GET_PIN(B, 0), GET_PIN(B, 1), GET_PIN(C, 0), GET_PIN(C, 1),
            GET_PIN(C, 2), GET_PIN(C, 3), GET_PIN(C, 4), GET_PIN(C, 5),
        },
        .private_data = (void *)ADC1,
    },
#endif
};

static void gd32_adc_gpio_init(rt_base_t pin)
{
    rcu_periph_clock_enable((rcu_periph_enum)PIN_GDRCU(pin));
    gpio_init(PIN_GDPORT(pin), GPIO_MODE_AIN, GPIO_OSPEED_50MHZ, PIN_GDPIN(pin));
}

static rt_err_t drv_adc_enabled(struct rt_adc_device *device, rt_uint32_t channel, rt_bool_t enabled)
{
    if ((device == NULL) || (channel >= MAX_EXTERN_ADC_CHANNEL))
    {
        LOG_E("invalid channel\r\n");
        return -RT_EINVAL;
    }

    gd32_adc_device *gd32_adc = (gd32_adc_device *)device;
    uint32_t adc_periph = (uint32_t )(device->parent.user_data);

    if (enabled == ENABLE)
    {
        gd32_adc_gpio_init(gd32_adc->adc_pins[channel]);
        adc_deinit(adc_periph);
        adc_channel_length_config(adc_periph, ADC_REGULAR_CHANNEL, 1);
        adc_data_alignment_config(adc_periph, ADC_DATAALIGN_RIGHT);             /* 数据右对齐 */
        adc_external_trigger_config(adc_periph, ADC_REGULAR_CHANNEL, ENABLE);   /* 规则组外部触发使能 */
        adc_external_trigger_source_config(adc_periph, ADC_REGULAR_CHANNEL, ADC0_1_2_EXTTRIG_REGULAR_NONE);
        adc_special_function_config(adc_periph, ADC_SCAN_MODE, DISABLE);        /* 扫描模式禁止，单通道模式 */
        adc_special_function_config(adc_periph, ADC_CONTINUOUS_MODE, DISABLE);  /* 连续转换禁止，单次转换模式 */
        adc_discontinuous_mode_config(adc_periph, ADC_REGULAR_CHANNEL, 1);      /* 规则组间断使能及转换通道数目 */
        adc_enable(adc_periph);
        rt_hw_us_delay(500);
        adc_calibration_enable(adc_periph); /* ADC自校准 */
    }
    else
    {
        adc_disable(adc_periph);
    }

    return 0;
}

static rt_err_t drv_adc_convert(struct rt_adc_device *device, rt_uint32_t channel, rt_uint32_t *value)
{
    if ((device == NULL) || (channel >= MAX_EXTERN_ADC_CHANNEL) || (value == NULL))
    {
        LOG_E("invalid param\r\n");
        return -RT_EINVAL;
    }

    uint32_t adc_periph = (uint32_t )(device->parent.user_data);

    adc_regular_channel_config(adc_periph, 0, channel, ADC_SAMPLETIME_239POINT5);
    adc_software_trigger_enable(adc_periph, ADC_REGULAR_CHANNEL);

    while(!adc_flag_get(adc_periph, ADC_FLAG_EOC)); /* 等待ADC转换完成 */
    adc_flag_clear(adc_periph, ADC_FLAG_EOC);       /* 清除转换完成标志位 */
    adc_flag_clear(adc_periph, ADC_FLAG_STRC);
    *value = adc_regular_data_read(adc_periph);

    return 0;
}

static struct rt_adc_ops drv_adc_ops = {
    .enabled = drv_adc_enabled,
    .convert = drv_adc_convert,
};

static int rt_hw_adc_init(void)
{
    int ret, i = 0;

#ifdef BSP_USING_ADC0
    rcu_periph_clock_enable(RCU_ADC0);
#endif

#ifdef BSP_USING_ADC1
    rcu_periph_clock_enable(RCU_ADC1);
#endif

    rcu_adc_clock_config(RCU_CKADC_CKAPB2_DIV6);    /* 72/6 = 12MHz  need < 14MHZ */
    adc_mode_config(ADC_MODE_FREE);

    for (; i < sizeof(adc_devs) / sizeof(gd32_adc_device); i++)
    {
        ret = rt_hw_adc_register(&adc_devs[i].adc_dev,
                                 (const char *)adc_devs[i].name,
                                 &drv_adc_ops, (void *)adc_devs[i].private_data);
        if (ret != RT_EOK)
        {
            /* TODO err handler */
            LOG_E("failed register %s, err=%d\r\n", adc_devs[i].name, ret);
        }
    }

    return ret;
}
INIT_BOARD_EXPORT(rt_hw_adc_init);
#endif