【APM32F402R Micro-EVB开发板测评】+多通道A/D数据采集及显示

只看该作者 · 2025-7-23 13:32

APM32F402R Micro-EVB开发板配有一个12bit ADC数模转换器，可进行多个数据通道的采集。
以3个数据采集通道为例，其信号输入的引脚分别对应PA0~PA2。
它对 ADC的初始化函数为：

void ADC_Init(void)

{

    GPIO_Config_T GPIO_ConfigStruct;

    ADC_Config_T ADC_ConfigStruct;

    RCM_EnableAPB2PeriphClock(RCM_APB2_PERIPH_GPIOA);

    GPIO_ConfigStructInit(&GPIO_ConfigStruct);

    GPIO_ConfigStruct.mode    = GPIO_MODE_ANALOG;

    GPIO_ConfigStruct.pin     = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2;

    GPIO_Config(GPIOA, &GPIO_ConfigStruct);

    RCM_EnableAPB2PeriphClock(RCM_APB2_PERIPH_ADC1);

    ADC_Reset(ADC1);

    ADC_ConfigStructInit(&ADC_ConfigStruct);

    ADC_ConfigStruct.mode                  = ADC_MODE_INDEPENDENT;

    ADC_ConfigStruct.scanConvMode          = ENABLE;

    ADC_ConfigStruct.continuousConvMode    = ENABLE;

    ADC_ConfigStruct.externalTrigConv      = ADC_EXT_TRIG_CONV_NONE;

    ADC_ConfigStruct.dataAlign             = ADC_DATA_ALIGN_RIGHT;

    ADC_ConfigStruct.nbrOfChannel          = ADC_CH_SIZE;

    ADC_Config(ADC1, &ADC_ConfigStruct);

    RCM_ConfigADCCLK(RCM_PCLK2_DIV_6);

    ADC_ConfigRegularChannel(ADC1, ADC_CHANNEL_0, 1, ADC_SAMPLETIME_13CYCLES5);

    ADC_ConfigRegularChannel(ADC1, ADC_CHANNEL_1, 2, ADC_SAMPLETIME_13CYCLES5);

    ADC_ConfigRegularChannel(ADC1, ADC_CHANNEL_2, 3, ADC_SAMPLETIME_13CYCLES5);

    DMA_Init();

    ADC_EnableDMA(ADC1);

    ADC_Enable(ADC1);

    ADC_ResetCalibration(ADC1);

    while (ADC_ReadResetCalibrationStatus(ADC1));

    ADC_StartCalibration(ADC1);

    while (ADC_ReadCalibrationStartFlag(ADC1));

    ADC_EnableSoftwareStartConv(ADC1);

}

通过串口对采集数据进行输出的函数为：

复制

void ADC_MultiChannelPolling(void)

{

float voltage;

uint8_t index;

for (index = 0; index < ADC_CH_SIZE; index++)

{

voltage = (adcData[index] * 3300.0) / 4095.0;

printf("ADC CH[%d] voltage = %.03f mV\r\n", index, voltage);

}

printf("\r\n");

}

检测多通道数据采集的主程序为：

复制

int main(void)

{

USART_Config_T USART_ConfigStruct;

USART_ConfigStructInit(&USART_ConfigStruct);

USART_ConfigStruct.baudRate = 115200;

USART_ConfigStruct.hardwareFlow = USART_HARDWARE_FLOW_NONE;

USART_ConfigStruct.mode = USART_MODE_TX;

USART_ConfigStruct.parity = USART_PARITY_NONE;

USART_ConfigStruct.stopBits = USART_STOP_BIT_1;

USART_ConfigStruct.wordLength = USART_WORD_LEN_8B;

BOARD_COM_Config(COM1, &USART_ConfigStruct);

ADC_Init();

while (1)

{

ADC_MultiChannelPolling();

Delay(1000);

}

}

经程序的编译和下载，其检测结果如图1所示。

图1 检测结果

在配接TFT显示屏的情况下，其采集数据的显示函数为：

复制

void ADC_MultiChannelPolling(void)

{

float voltage;

uint8_t index;

for (index = 0; index < ADC_CH_SIZE; index++)

{

voltage = (adcData[index] * 3300.0) / 4095.0;

if(index ==0) LCD_ShowNum(60,60,voltage,4);

if(index ==1) LCD_ShowNum(60,90,voltage,4);

if(index ==2) LCD_ShowNum(60,120,voltage,4);

}

}

测试采集数据显示效果的主程序为：

复制

int main(void)

{

BOARD_TFT_Config();

tft_Init();

LCD_Clear(RED);

BACK_COLOR=RED;

POINT_COLOR=YELLOW;

LCD_ShowString(120,10,"APM32F402");

POINT_COLOR=WHITE;

LCD_DrawLine(0, 30, 319, 30);

LCD_DrawLine(0, 210, 319, 210);

POINT_COLOR=YELLOW;

LCD_ShowString(20,60,"ch0: mV ");

LCD_ShowString(20,90,"ch1: mV ");

LCD_ShowString(20,120,"ch2: mV ");

ADC_Init();

while (1)

{

ADC_MultiChannelPolling();

Delay(1000);

}

}