Arm 如何在STM32 MCU中每通道每n秒读取几个ADC接口？
我使用STM32F0微控制器的ADC通道（12位分辨率）读取电路板三个不同点的电压值。我想做的是每2秒读取一次值（我有2秒的时间读取三个点中的值），然后通过UART接口发送它们。为了选择我正在读取的ADC通道，我实现了如下电压读取功能：Arm 如何在STM32 MCU中每通道每n秒读取几个ADC接口？,arm,adc,stm32f0,Arm,Adc,Stm32f0,我使用STM32F0微控制器的ADC通道（12位分辨率）读取电路板三个不同点的电压值。我想做的是每2秒读取一次值（我有2秒的时间读取三个点中的值），然后通过UART接口发送它们。为了选择我正在读取的ADC通道，我实现了如下电压读取功能： uint16_t readv1(void){ //Here I try to read ADC_CHANNEL_1 //chConfig and txtbuff are global variables: //ADC_ChannelCon
uint16_t readv1(void){
//Here I try to read ADC_CHANNEL_1
//chConfig and txtbuff are global variables:
//ADC_ChannelConfTypeDef chConfig;
//char txtbuff[64];
chConfig.Channel = ADC_CHANNEL_1;
HAL_ADC_ConfigChannel(&hadc, &chConfig);
uint32_t vref = HAL_ADC_GetValue(&hadc);
uint16_t vref2 = (uint16_t) vref;
sprintf(TextBuffer, "%u\n", vref2);
HAL_UART_Transmit(&huart4, (uint8_t*)txtbuff, strlen(txtbuff), 0xFFFFFFFF);
return vref2;
}
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim){
if (htim->Instance==TIM3){
//Here I call the functions which read the voltage values of different ADC channels
volt1 = readv1();
readv2(volt1);
readv3(volt1);
}
}
uint16_t readv1(void){
chConfig.Channel = ADC_CHANNEL_1;
// I added these two lines after the ADC channel selection
chConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
chConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;
// The first one will configure the ADC channel as enabled
// The second one is the sampling time (1.5)
HAL_ADC_ConfigChannel(&hadc, &chConfig);
// Then I added these two instructions:
HAL_ADC_Start_IT(&hadc);
HAL_ADCEx_Calibration_Start(&hadc);
// The first one starts the ADC in interruption mode
// The second one calls the calibration function
uint32_t vref = HAL_ADC_GetValue(&hadc);
// Finally I added these three last instructions:
HAL_ADC_Stop_IT(&hadc);
chConfig.Rank = ADC_RANK_NONE;
HAL_ADC_ConfigChannel(&hadc, &chConfig);
// The first one stops the ADC
// The second one will configure the ADC channel as disabled
// The third one sets the channel with the new parameters
uint16_t vref2 = (uint16_t) vref;
sprintf(TextBuffer, "%u\n", vref2);
HAL_UART_Transmit(&huart4, (uint8_t*)txtbuff, strlen(txtbuff), 0xFFFFFFFF);
return vref2;
}
chConfig.Channel=ADC\u Channel\n中n
的值其中n
是频道号。请注意，chConfig
与MX\u ADC\u Init（）
函数中声明的sConfig
类型相同，但chConfig
是全局变量，是否应在每个函数中声明为局部变量
我遇到的问题是，readv1
函数读取恒定电压（我用电压计检查过），但终端通过UART显示的数字变化很大，在120和2400之间。我不确定是否使用行chConfig.Channel=ADC\u Channel\u 1是好的，或者是否有任何其他步骤要遵循。如何正确读取每个ADC的值
为了每两秒钟扫描一次ADC，我使用了一个8 MHz定时器，如下所示：
uint16_t readv1(void){
//Here I try to read ADC_CHANNEL_1
//chConfig and txtbuff are global variables:
//ADC_ChannelConfTypeDef chConfig;
//char txtbuff[64];
chConfig.Channel = ADC_CHANNEL_1;
HAL_ADC_ConfigChannel(&hadc, &chConfig);
uint32_t vref = HAL_ADC_GetValue(&hadc);
uint16_t vref2 = (uint16_t) vref;
sprintf(TextBuffer, "%u\n", vref2);
HAL_UART_Transmit(&huart4, (uint8_t*)txtbuff, strlen(txtbuff), 0xFFFFFFFF);
return vref2;
}
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim){
if (htim->Instance==TIM3){
//Here I call the functions which read the voltage values of different ADC channels
volt1 = readv1();
readv2(volt1);
readv3(volt1);
}
}
uint16_t readv1(void){
chConfig.Channel = ADC_CHANNEL_1;
// I added these two lines after the ADC channel selection
chConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
chConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;
// The first one will configure the ADC channel as enabled
// The second one is the sampling time (1.5)
HAL_ADC_ConfigChannel(&hadc, &chConfig);
// Then I added these two instructions:
HAL_ADC_Start_IT(&hadc);
HAL_ADCEx_Calibration_Start(&hadc);
// The first one starts the ADC in interruption mode
// The second one calls the calibration function
uint32_t vref = HAL_ADC_GetValue(&hadc);
// Finally I added these three last instructions:
HAL_ADC_Stop_IT(&hadc);
chConfig.Rank = ADC_RANK_NONE;
HAL_ADC_ConfigChannel(&hadc, &chConfig);
// The first one stops the ADC
// The second one will configure the ADC channel as disabled
// The third one sets the channel with the new parameters
uint16_t vref2 = (uint16_t) vref;
sprintf(TextBuffer, "%u\n", vref2);
HAL_UART_Transmit(&huart4, (uint8_t*)txtbuff, strlen(txtbuff), 0xFFFFFFFF);
return vref2;
}
这是我初始化外围设备的主要功能：
int main(void)
{
/* MCU Configuration----------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* Configure the system clock */
SystemClock_Config();
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_USART4_UART_Init();
MX_ADC_Init();
MX_TIM3_Init();
/* USER CODE BEGIN 2 */
HAL_ADC_Start_IT(&hadc);
HAL_TIM_Base_Start_IT(&htim3);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
}
}
以下是定时器和ADC的初始化功能：
/* TIM3 init function */
static void MX_TIM3_Init(void)
{
TIM_ClockConfigTypeDef sClockSourceConfig;
TIM_MasterConfigTypeDef sMasterConfig;
htim3.Instance = TIM3;
htim3.Init.Prescaler = 8000;
htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
htim3.Init.Period = 1999;
htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
if (HAL_TIM_Base_Init(&htim3) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
}
/* ADC init function */
static void MX_ADC_Init(void)
{
ADC_ChannelConfTypeDef sConfig;
/**Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
*/
hadc.Instance = ADC1;
hadc.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
hadc.Init.Resolution = ADC_RESOLUTION_12B;
hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
hadc.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc.Init.LowPowerAutoWait = DISABLE;
hadc.Init.LowPowerAutoPowerOff = DISABLE;
hadc.Init.ContinuousConvMode = ENABLE;
hadc.Init.DiscontinuousConvMode = DISABLE;
hadc.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc.Init.DMAContinuousRequests = DISABLE;
hadc.Init.Overrun = ADC_OVR_DATA_PRESERVED;
if (HAL_ADC_Init(&hadc) != HAL_OK)
{
Error_Handler();
}
/**Configure for the selected ADC regular channel to be converted.
*/
sConfig.Channel = ADC_CHANNEL_0;
sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
sConfig.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
Error_Handler();
}
/**Configure for the selected ADC regular channel to be converted.
*/
sConfig.Channel = ADC_CHANNEL_1;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
Error_Handler();
}
/**Configure for the selected ADC regular channel to be converted.
*/
sConfig.Channel = ADC_CHANNEL_2;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
Error_Handler();
}
/**Configure for the selected ADC regular channel to be converted.
*/
sConfig.Channel = ADC_CHANNEL_4;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
Error_Handler();
}
}
我通过修改函数解决了这个问题，如下所示：
uint16_t readv1(void){
//Here I try to read ADC_CHANNEL_1
//chConfig and txtbuff are global variables:
//ADC_ChannelConfTypeDef chConfig;
//char txtbuff[64];
chConfig.Channel = ADC_CHANNEL_1;
HAL_ADC_ConfigChannel(&hadc, &chConfig);
uint32_t vref = HAL_ADC_GetValue(&hadc);
uint16_t vref2 = (uint16_t) vref;
sprintf(TextBuffer, "%u\n", vref2);
HAL_UART_Transmit(&huart4, (uint8_t*)txtbuff, strlen(txtbuff), 0xFFFFFFFF);
return vref2;
}
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim){
if (htim->Instance==TIM3){
//Here I call the functions which read the voltage values of different ADC channels
volt1 = readv1();
readv2(volt1);
readv3(volt1);
}
}
uint16_t readv1(void){
chConfig.Channel = ADC_CHANNEL_1;
// I added these two lines after the ADC channel selection
chConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
chConfig.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;
// The first one will configure the ADC channel as enabled
// The second one is the sampling time (1.5)
HAL_ADC_ConfigChannel(&hadc, &chConfig);
// Then I added these two instructions:
HAL_ADC_Start_IT(&hadc);
HAL_ADCEx_Calibration_Start(&hadc);
// The first one starts the ADC in interruption mode
// The second one calls the calibration function
uint32_t vref = HAL_ADC_GetValue(&hadc);
// Finally I added these three last instructions:
HAL_ADC_Stop_IT(&hadc);
chConfig.Rank = ADC_RANK_NONE;
HAL_ADC_ConfigChannel(&hadc, &chConfig);
// The first one stops the ADC
// The second one will configure the ADC channel as disabled
// The third one sets the channel with the new parameters
uint16_t vref2 = (uint16_t) vref;
sprintf(TextBuffer, "%u\n", vref2);
HAL_UART_Transmit(&huart4, (uint8_t*)txtbuff, strlen(txtbuff), 0xFFFFFFFF);
return vref2;
}
我添加了我在读取ADC通道的三个函数中提到的行。实际上，当我使用相同的程序读取所有ADC通道时，我创建了一个函数，该函数接收通道号作为参数。volt1=readv1（）；readv2（volt1）；readv3（volt1）；为什么raeadv2（）和readv3（）接受参数volt1，而readv1（）不接受？您说过“对于读取其他两个ADC通道，我使用相同的过程，只是更改行chConfig.Channel=ADC\u Channel\n；中的n是通道号。”尝试为volt1变量添加“volatile”。