STM32F072CBU微控制器。
我有多个ADC输入，希望单独和单独读取它们。 STMcubeMX生成样板代码，假设我希望按顺序读取所有输入，并且我无法弄清楚如何纠正这一点。
This blog post表达了我遇到的同样问题，但给出的解决方案似乎没有效果。为每次转换打开和关闭ADC与返回值中的错误相关。只有当我在STMcubeMX中配置单个ADC输入然后在不取消初始化ADC的情况下进行轮询才能返回准确的读数。
cubeMX＆＃39s的adc_init函数：
/* 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_SYNC_PCLK_DIV4;
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 = DISABLE;
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(__FILE__, __LINE__);
}
/**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_41CYCLES_5;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
/**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(__FILE__, __LINE__);
}
/**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(__FILE__, __LINE__);
}
/**Configure for the selected ADC regular channel to be converted.
*/
sConfig.Channel = ADC_CHANNEL_3;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
/**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(__FILE__, __LINE__);
}
/**Configure for the selected ADC regular channel to be converted.
*/
sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
/**Configure for the selected ADC regular channel to be converted.
*/
sConfig.Channel = ADC_CHANNEL_VREFINT;
if (HAL_ADC_ConfigChannel(&hadc, &sConfig) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
}
的main.c
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration----------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_ADC_Init();
MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
//HAL_TIM_Base_Start_IT(&htim3);
init_printf(NULL, putc_wrangler);
HAL_ADCEx_Calibration_Start(&hadc);
HAL_ADC_DeInit(&hadc); // ADC is initialized for every channel change
schedule_initial_events();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
event_loop();
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
/* USER CODE END 3 */
}
我现在正在关闭ADC并重新初始化以更改频道：
// Set up
ADC_ChannelConfTypeDef channelConfig;
channelConfig.SamplingTime = samplingT;
channelConfig.Channel = sensorChannel;
channelConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
if (HAL_ADC_Init(&hadc) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
if (HAL_ADC_ConfigChannel(&hadc, &channelConfig) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
// Convert
uint16_t retval;
if (HAL_ADC_Start(&hadc) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
if (HAL_ADC_PollForConversion(&hadc, 1) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
if (HAL_ADC_GetError(&hadc) != HAL_ADC_ERROR_NONE)
{
_Error_Handler(__FILE__, __LINE__);
}
retval = (uint16_t) HAL_ADC_GetValue(&hadc);
if (HAL_ADC_Stop(&hadc) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}
// Close
HAL_ADC_DeInit(&hadc);
此时我并不确定是否有办法完成我想要的工作，STM32似乎无法在有源ADC线上设置为常规组并按顺序进行转换。
答案 0 :(得分：2)
如果要在单次转换模式下读取多个ADC通道，则必须在每次读取之前更改通道设置，但不必重新启动ADC。只需按照以下步骤操作，选择新频道（如果频道必须不同，您也可以更改采样时间，但通常可以相同），选择频道等级，然后调用HAL_ADC_ConfigChannel功能。在此之后，您可以执行转换。
public用法示例：
void config_ext_channel_ADC(uint32_t channel, boolean_t val)
{
ADC_ChannelConfTypeDef sConfig;
sConfig.Channel = channel;
sConfig.SamplingTime = ADC_SAMPLETIME_71CYCLES_5;
if(True == val)
{
sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
}
else
{
sConfig.Rank = ADC_RANK_NONE;
}
HAL_ADC_ConfigChannel(&hadc, &sConfig);
}
uint32_t r_single_ext_channel_ADC(uint32_t channel)
{
uint32_t digital_result;
config_ext_channel_ADC(channel, True);
HAL_ADCEx_Calibration_Start(&hadc);
HAL_ADC_Start(&hadc);
HAL_ADC_PollForConversion(&hadc, 1000);
digital_result = HAL_ADC_GetValue(&hadc);
HAL_ADC_Stop(&hadc);
config_ext_channel_ADC(channel, False);
return digital_result;
}
此代码用于STM32F030。为了读取内部温度传感器和参考电压，需要稍微不同的上述功能版本，因为必须设置额外的使能位。
#define SUPPLY_CURRENT ADC_CHANNEL_5
#define BATTERY_VOLTAGE ADC_CHANNEL_6
uint16_t r_battery_voltage(uint16_t mcu_vcc)
{
float vbat;
uint16_t digital_val;
digital_val = r_single_ext_channel_ADC(BATTERY_VOLTAGE);
vbat = (mcu_vcc/4095.0) * digital_val;
vbat = vbat * 2; // 1/2 voltage divider
return vbat;
}
uint16_t r_supply_current(uint16_t mcu_vcc)
{
float v_sense, current;
uint16_t digital_val;
digital_val = r_single_ext_channel_ADC(SUPPLY_CURRENT);
v_sense = (mcu_vcc/4095.0) * digital_val;
current = v_sense * I_SENSE_GAIN;
return current;
}
MCU VDD计算的内部电压参考示例：
void config_int_channel_ADC(uint32_t channel, boolean_t val)
{
ADC_ChannelConfTypeDef sConfig;
sConfig.Channel = channel;
if(val == True)
{
if(channel == ADC_CHANNEL_VREFINT)
{
ADC->CCR |= ADC_CCR_VREFEN;
hadc.Instance->CHSELR = (uint32_t)(ADC_CHSELR_CHSEL17);
}
else if(channel == ADC_CHANNEL_TEMPSENSOR)
{
ADC->CCR |= ADC_CCR_TSEN;
hadc.Instance->CHSELR = (uint32_t)(ADC_CHSELR_CHSEL16);
}
sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
sConfig.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
}
else if(val == False)
{
if(channel == ADC_CHANNEL_VREFINT)
{
ADC->CCR &= ~ADC_CCR_VREFEN;
hadc.Instance->CHSELR = 0;
}
else if(channel == ADC_CHANNEL_TEMPSENSOR)
{
ADC->CCR &= ~ADC_CCR_TSEN;
hadc.Instance->CHSELR = 0;
}
sConfig.Rank = ADC_RANK_NONE;
sConfig.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
}
HAL_ADC_ConfigChannel(&hadc,&sConfig);
}
uint32_t r_single_int_channel_ADC(uint32_t channel)
{
uint32_t digital_result;
config_int_channel_ADC(channel, True);
HAL_ADCEx_Calibration_Start(&hadc);
HAL_ADC_Start(&hadc);
HAL_ADC_PollForConversion(&hadc, 1000);
digital_result = HAL_ADC_GetValue(&hadc);
HAL_ADC_Stop(&hadc);
config_int_channel_ADC(channel, False);
return digital_result;
}
内部温度传感器读数：
#define VREFINT_CAL_ADDR ((uint16_t*) ((uint32_t) 0x1FFFF7BA))
static float FACTORY_CALIB_VDD = 3.31;
uint16_t calculate_MCU_vcc()
{
float analog_Vdd;
uint16_t val_Vref_int = r_single_int_channel_ADC(ADC_CHANNEL_VREFINT);
analog_Vdd = (FACTORY_CALIB_VDD * (*VREFINT_CAL_ADDR))/val_Vref_int;
return analog_Vdd * 1000;
}
请注意，MCU的校准数据地址可能不同，请查看数据表以获取更多信息。
答案 1 :(得分：0)
我有类似的问题。我正在使用STM32F091RC。在ADC_V_PIN上，我具有外部多路复用器。在ADC_T_PIN上，我读取了NTC。我当时使用GPIO控制外部多路复用器（在下面的代码中看不到）。我需要的是在单个ADC_T_PIN读数之后的多个连续ADC_V_PIN读数。使用默认的ADC顺序读取，我将在ADC_V_PIN和ADC_T_PIN的每个外部复用读取之间获得。多次使用HAL_ADC_ConfigChannel似乎彼此互为或，并且我在阅读时遇到了问题。所以我根本没有使用HAL_ADC_ConfigChannel。相反，我在每个软件触发AD转换之前重新配置了CHSELR寄存器。这是使内部和外部多路复用器协同工作的方式。
这是初始化代码：
GPIO_InitStruct.Pin = ADC_V_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(ADC_V_PORT, &GPIO_InitStruct);
GPIO_InitStruct.Pin = ADC_T_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(ADC_T_PORT, &GPIO_InitStruct);
g_AdcHandle.Instance = ADC1;
if (HAL_ADC_DeInit(&g_AdcHandle) != HAL_OK)
{
/* ADC initialization error */
Error_Handler();
}
g_AdcHandle.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
g_AdcHandle.Init.Resolution = ADC_RESOLUTION_12B;
g_AdcHandle.Init.DataAlign = ADC_DATAALIGN_RIGHT;
g_AdcHandle.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;;
g_AdcHandle.Init.ContinuousConvMode = DISABLE;
g_AdcHandle.Init.DiscontinuousConvMode = ENABLE;
g_AdcHandle.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
g_AdcHandle.Init.LowPowerAutoWait = DISABLE;
g_AdcHandle.Init.LowPowerAutoPowerOff = DISABLE;
g_AdcHandle.Init.ExternalTrigConv = ADC_SOFTWARE_START;
g_AdcHandle.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
g_AdcHandle.Init.DMAContinuousRequests = DISABLE;
g_AdcHandle.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
g_AdcHandle.Init.SamplingTimeCommon = ADC_SAMPLETIME_239CYCLES_5;
if (HAL_ADC_Init(&g_AdcHandle) != HAL_OK)
{
/* ADC initialization error */
Error_Handler();
}
if (HAL_ADCEx_Calibration_Start(&g_AdcHandle) != HAL_OK)
{
/* Calibration Error */
Error_Handler();
}
while(1){
ADC1->CHSELR = ADC_CHSELR_CHSEL0;
HAL_ADC_Start(&g_AdcHandle);
HAL_ADC_PollForConversion(&g_AdcHandle, 10);
V = HAL_ADC_GetValue(&g_AdcHandle);
HAL_ADC_Stop(&g_AdcHandle);
ADC1->CHSELR = ADC_CHSELR_CHSEL10;
HAL_ADC_Start(&g_AdcHandle);
HAL_ADC_PollForConversion(&g_AdcHandle, 10);
T = HAL_ADC_GetValue(&g_AdcHandle);
HAL_ADC_Stop(&g_AdcHandle);
}