ra6m3之adc踩坑日志（基于rt-thread ）

问题描述

1.已经用fsp工具正确配置Pins

2.已经用fsp工具正确配置Stacks

3.问题是根本没有在RT-Thread Studio看到HAL相关的ADC代码，也没看到Settings里边的ADC配置选项

问题分析

RT-Thread跟Linux内核一样，采用Kconfig来配置驱动和组件，既然没有看到有ADC选项，可以考虑自己添加一个；再者，HAL_Drivers目录下的SConscript代码是这样的 ：

Import('RTT_ROOT')
Import('rtconfig')
from building import *

cwd = GetCurrentDir()

# add the general drivers.
src = Split("""
    drv_common.c
""")

if GetDepend(['BSP_USING_UART']):
    if GetDepend(['RT_USING_SERIAL_V2']):
        src += ['drv_usart_v2.c']
    else:
        print("\nThe current project does not support serial-v1\n")
        Return('group')

if GetDepend(['BSP_USING_GPIO']):
    src += ['drv_gpio.c']

if GetDepend(['BSP_USING_WDT']):
    src += ['drv_wdt.c']

if GetDepend(['BSP_USING_ONCHIP_RTC']):
    src += ['drv_rtc.c']

if GetDepend(['BSP_USING_I2C', 'RT_USING_I2C_BITOPS']):
    if GetDepend('BSP_USING_I2C0') or GetDepend('BSP_USING_I2C1'):
        src += ['drv_soft_i2c.c']

if GetDepend(['BSP_USING_I2C', 'BSP_USING_HW_I2C']):
        src += ['drv_i2c.c']

if GetDepend(['BSP_USING_SPI']):
    src += ['drv_spi.c']

if GetDepend(['BSP_USING_SCI_SPI']):
    src += ['drv_sci_spi.c']

if GetDepend(['BSP_USING_ADC']):
    src += ['drv_adc.c']

if GetDepend(['BSP_USING_DAC']):
    src += ['drv_dac.c']

if GetDepend(['BSP_USING_ONCHIP_FLASH']):
    src += ['drv_flash.c']

if GetDepend(['BSP_USING_PWM']):
    src += ['drv_pwm.c']

if GetDepend(['BSP_USING_ETH']):
    src += ['drv_eth.c']

if GetDepend(['BSP_USING_CAN']):
    src += ['drv_can.c']

if GetDepend(['BSP_USING_SDHI']):
    src += ['drv_sdhi.c']

if GetDepend(['BSP_USING_LCD']):
    src += ['drv_lcd.c']

path =  [cwd]
path += [cwd + '/config']

group = DefineGroup('Drivers', src, depend = [''], CPPPATH = path)

Return('group')

可以了解到drv_adc.c在HAL_Drivers目录下是存在的，只是它没有添加到整个RT-Thread工程里边来，只要开启BSP_USING_ADC宏即可；于是乎，编写Kconfig开启ADC支持，RT_USING_ADC是RT-Thread支持ADC的宏开关，代码如下：

config BSP_USING_ADC
    bool "Enable ADC"
    select BSP_USING_ADC0
    select RT_USING_ADC
    default y

重新编译，但是编译报错

很明显，需要开启BSP_USING_ADC0这个宏，于是乎，又在Kconfig加上一下代码：

config BSP_USING_ADC0
    bool "Enable ADC0"
    default y

重新打开Settings，终于看到两个开关，重新编译工程也没有问题了

测试

示例程序，在hal_entry.c加入以下代码：

/*
 * Copyright (c) 2006-2023, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author        Notes
 * 2021-10-10     Sherman       first version
 */

#include <rtthread.h>
#include "hal_data.h"
#include <rtdevice.h>

#define LED_PIN    BSP_IO_PORT_02_PIN_09 /* Onboard LED pins */

#define ADC_DEV_NAME        "adc0"      /* ADC 设备名称 */
#define ADC_DEV_CHANNEL     1           /* ADC 通道 */
#define REFER_VOLTAGE       330         /* 参考电压 3.3V,数据精度乘以100保留2位小数*/
#define CONVERT_BITS        (1 << 12)   /* 转换位数为12位 */

static int adc_vol_sample(int argc, char *argv[])
{
    rt_adc_device_t adc_dev;
    rt_uint32_t value, vol;
    rt_err_t ret = RT_EOK;

    /* 查找设备 */
    adc_dev = (rt_adc_device_t)rt_device_find(ADC_DEV_NAME);
    if (adc_dev == RT_NULL)
    {
        rt_kprintf("adc sample run failed! can't find %s device!\n", ADC_DEV_NAME);
        return RT_ERROR;
    }

    /* 使能设备 */
    ret = rt_adc_enable(adc_dev, ADC_DEV_CHANNEL);

    /* 读取采样值 */
    value = rt_adc_read(adc_dev, ADC_DEV_CHANNEL);
    rt_kprintf("the value is :%d \n", value);

    /* 转换为对应电压值 */
    vol = value * REFER_VOLTAGE / CONVERT_BITS;
    rt_kprintf("the voltage is :%d.%02d \n", vol / 100, vol % 100);

    /* 关闭通道 */
    ret = rt_adc_disable(adc_dev, ADC_DEV_CHANNEL);

    return ret;
}
/* 导出到 msh 命令列表中 */
MSH_CMD_EXPORT(adc_vol_sample, adc voltage convert sample);

void hal_entry(void)
{
    rt_kprintf("\nHello RT-Thread!\n");

    while (1)
    {
        rt_pin_write(LED_PIN, PIN_HIGH);
        rt_thread_mdelay(500);
        rt_pin_write(LED_PIN, PIN_LOW);
        rt_thread_mdelay(500);
    }
}

烧写运行demo，P001接板子电源口，运行结果如下，电压还是算合理的