RA生态之ADC 采样

ADC 配置

点击 Stacks->New Stack-> Analog -> ADC r_adc

先是单通道ADC

默认12位ADC精度，对齐方式扫描(也最常见的方式)

下图是设置回调函数adc_callback，和回调中断优先级为2

 在PIN那里选择通道

R_ADC_Open()函数:开启和初始化 ADC 模式(在这里是开启adc0)

/* Initializes the module. */

err = R_ADC_Open(&g_adc0_ctrl, &g_adc0_cfg);

/* Handle any errors. This function should be defined by the user. */

assert(FSP_SUCCESS == err);

 R_ADC_ScanCfg()函数: 配置 ADC 扫描参数，赋能 ADC 通道(在这里是赋能adc的通道0)

/* Enable channels. */

err = R_ADC_ScanCfg(&g_adc0_ctrl, &g_adc0_channel_cfg);

assert(FSP_SUCCESS == err);

 R_ADC_ScanStart()函数:启动扫描，若设置为单次扫描，没扫描完一次都需要重新开启

/* Enable scan triggering from ELC events. */

、

(void) R_ADC_ScanStart(&g_adc0_ctrl);

 回调函数 adc_callback ()（名字是自己定义的）:学过51都知道中断吧，差不多的意思

volatile bool scan_complete_flag = false;

void adc_callback (adc_callback_args_t * p_args)

{

        FSP_PARAMETER_NOT_USED(p_args);

        scan_complete_flag = true;

}

 故需要在扫描时候在主程序中等待其扫描完毕

scan_complete_flag = false;

while (!scan_complete_flag)

{

        /* Wait for callback to set flag. */

}

 R_ADC_Read()函数：读取单个通道的 ADC 值

err =R_ADC_Read(&g_adc0_ctrl, ADC_CHANNEL_0, &adc_data1);

assert(FSP_SUCCESS == err);

a1=(double)(adc_data1/4095.0)*3.3;

 示例代码：

double a0;

uint16_t adc_data1=0;

volatile bool scan_complete_flag = false;

void adc_callback (adc_callback_args_t * p_args)

{

        FSP_PARAMETER_NOT_USED(p_args);

        scan_complete_flag = true;

}

void hal_entry(void)

{

        /* TODO: add your own code here */

        fsp_err_t err = FSP_SUCCESS;

        /* Initializes the module. */

        err = R_ADC_Open(&g_adc0_ctrl, &g_adc0_cfg);

        /* Handle any errors. This function should be defined by the user. */

        assert(FSP_SUCCESS == err);

        /* Enable channels. */

        err = R_ADC_ScanCfg(&g_adc0_ctrl, &g_adc0_channel_cfg);

        assert(FSP_SUCCESS == err);

while(1)

{

        /* Enable scan triggering from ELC events. */

        R_ADC_ScanStart(&g_adc0_ctrl);

        scan_complete_flag = false;

        while (!scan_complete_flag)

        {

                /* Wait for callback to set flag. */

        }

        err =R_ADC_Read(&g_adc0_ctrl, ADC_CHANNEL_0, &adc_data1);

        assert(FSP_SUCCESS == err);

        a0=(adc_data1/4095.0)*3.3;

        R_BSP_SoftwareDelay (20, BSP_DELAY_UNITS_MILLISECONDS);

}

#if BSP_TZ_SECURE_BUILD

/* Enter non-secure code */

R_BSP_NonSecureEnter();

#endif

}

 

现象：可读取通道 0（P000）电压值a0