我正在尝试从三个不同的通道读取 ADC 值(现在,稍后它将是 6 个通道,每个 ADC 上 3 个),我想在随机时间后访问我的 ADC 缓冲区并稍后使用 UART 发送它. 现在它们只是连接到+3.3V,中间有一个微调电位器,导致所有三个引脚上的电压不同,这意味着我应该能够经常读取ADC吗?无论如何,要做到这一点,我使用的是 STM32f303k8 板,我已经设置了要使用的 ADC1 通道 2,4 和 11。我使用 STM32CubeMX 生成代码,使用 HAL 库,在其中我将其配置为在循环模式下使用 DMA,使用连续转换和不同等级进行扫描转换。启动时(使用断点),我可以看到代码的 init 部分工作正常。ADC 初始化并启动 DMA,我什至用正确的值从 ADC1 将值输入我的缓冲区,通道 1 != 通道 2 != 通道 3。问题是当继续进行时,进程卡在无限循环处理程序中,并且永远不会到达我的 while(1) 那里我有一些任意语句。代码如下。
我一直在遵循不同的指南,看看我是否设置错了。其中之一是https://tunizem.blogspot.com/2014/09/using-adc-with-dma-on-stm32.html?showComment=1562660027777#c1229743050555367742。我尝试将采样时间从 1.5 一直更改为 601.5 个周期,还尝试将 EOCSelection 从单个更改为顺序。
ADC_HandleTypeDef hadc1;
DMA_HandleTypeDef hdma_adc1;
void MX_DMA_Init(void)
{
/* DMA controller clock enable */
__HAL_RCC_DMA1_CLK_ENABLE();
/* DMA interrupt init */
/* DMA1_Channel1_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA1_Channel1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn);
}
/* ADC1 init function */
void MX_ADC1_Init(void)
{
ADC_MultiModeTypeDef multimode = {0};
ADC_ChannelConfTypeDef sConfig = {0};
/** Common config
*/
hadc1.Instance = ADC1;
hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV4;
hadc1.Init.Resolution = ADC_RESOLUTION_12B;
hadc1.Init.ScanConvMode = ADC_SCAN_ENABLE;
hadc1.Init.ContinuousConvMode = ENABLE;
hadc1.Init.DiscontinuousConvMode = DISABLE;
hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc1.Init.NbrOfConversion = 3;
hadc1.Init.DMAContinuousRequests = ENABLE;//ENABLE;
hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc1.Init.LowPowerAutoWait = DISABLE;
hadc1.Init.Overrun = ADC_OVR_DATA_PRESERVED;//OVERWRITTEN;
if (HAL_ADC_Init(&hadc1) != HAL_OK)
{
Error_Handler();
}
/** Configure the ADC multi-mode
*/
multimode.Mode = ADC_MODE_INDEPENDENT;
if (HAL_ADCEx_MultiModeConfigChannel(&hadc1, &multimode) != HAL_OK)
{
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_2;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SingleDiff = ADC_SINGLE_ENDED;
sConfig.SamplingTime = ADC_SAMPLETIME_61CYCLES_5;
sConfig.OffsetNumber = ADC_OFFSET_NONE;
sConfig.Offset = 0;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_4;
sConfig.Rank = ADC_REGULAR_RANK_2;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_11;
sConfig.Rank = ADC_REGULAR_RANK_3;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
Error_Handler();
}
}
*
*
*
uint32_t adcValue1[60];
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_DMA_Init();
MX_ADC1_Init();
//MX_ADC2_Init();
MX_I2C1_Init();
MX_USART1_UART_Init();
MX_USART2_UART_Init();
//Start ADC writing to DMA on scan complete
if(HAL_ADC_Start_DMA(&hadc1, (uint32_t*)adcValue1, 120) != HAL_OK)
return 0;
uint32_t stopwatch = HAL_GetTick();
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while(1)
{
if(((uint32_t)HAL_GetTick() - stopwatch) > 49)
{
stopwatch = HAL_GetTick();
HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_3);
sprintf((char*)buffer, "(%d)\t ADC1, (%d)\t ADC2, (%d)\t ADC3",
adcValue1[0],
adcValue1[1], adcValue1[2]);
}
}
/* USER CODE END 3 */
}
}
我在“uint32_t stopwatch = HAL_GetTick();”处有一个断点 我可以看到 adcValue1 正在读取值。这些都是正确的,因为有 3.3V 进入所有三个,不同之处在于电位计设置为在通道 2 上输出 2.2V,即它低于其他两个。但这是我唯一一次可以看到正在阅读,因为在此之后它陷入了无限循环。
enter code here
adcValue1 uint32_t [60] 0x20000220 <adcValue1>
adcValue1[0] uint32_t 2614
adcValue1[1] uint32_t 3638
adcValue1[2] uint32_t 3639
adcValue1[3] uint32_t 2612
adcValue1[4] uint32_t 3639
adcValue1[5] uint32_t 3637
adcValue1[6] uint32_t 2615
adcValue1[7] uint32_t 3642
adcValue1[8] uint32_t 3641
adcValue1[9] uint32_t 2616
adcValue1[10] uint32_t 3642
adcValue1[11] uint32_t 3638
adcValue1[12] uint32_t 2611
adcValue1[13] uint32_t 3637
adcValue1[14] uint32_t 3640
adcValue1[15] uint32_t 2614
adcValue1[16] uint32_t 3639
adcValue1[17] uint32_t 3639
adcValue1[18] uint32_t 2615
adcValue1[19] uint32_t 3643
* @brief This is the code that gets called when the processor receives
an
* unexpected interrupt. This simply enters an infinite loop,
preserving
* the system state for examination by a debugger.
*
* @param None
* @retval : None
*/
Default_Handler:
Infinite_Loop: <--- STUCK HERE
b Infinite_Loop
.size Default_Handler, .-Default_Handler