Problem in using ADC1 Channel 1 in DMA mode

[Ly Tai]

Posted on May 31, 2018 at 10:18

   Hi everyone! Currently I'm working with multi channel adc on STM32F103. And I tried to read ADC on 5 channel including ch0,ch1,ch2,ch3 and ch6 by using DMA. However, I met a problem that I cannot read the ADC value on channel 1 while the others work normally. I've found that the DMA use channel 1 as the interrupt pin and I wonder if it cause the problem. Do you have any ideas to overcome that problem? You can find the DMA and ADC1 initialization code below. Thank you so much!

ps: I cannot change the channel 1 to another because of requirement.

static void MX_ADC1_Init(void)

{

ADC_ChannelConfTypeDef sConfig;

/**Common config

*/ hadc1.Instance = ADC1; hadc1.Init.ScanConvMode = ADC_SCAN_ENABLE; hadc1.Init.ContinuousConvMode = ENABLE; hadc1.Init.DiscontinuousConvMode = DISABLE; hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START; hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT; hadc1.Init.NbrOfConversion = 5; if (HAL_ADC_Init(&hadc1) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); }

/**Configure Regular Channel

*/ sConfig.Channel = ADC_CHANNEL_0; sConfig.Rank = ADC_REGULAR_RANK_1; sConfig.SamplingTime = ADC_SAMPLETIME_239CYCLES_5; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); }

/**Configure Regular Channel

*/ sConfig.Channel = ADC_CHANNEL_1; sConfig.Rank = ADC_REGULAR_RANK_2; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); }

/**Configure Regular Channel

*/ sConfig.Channel = ADC_CHANNEL_2; sConfig.Rank = ADC_REGULAR_RANK_3; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); }

/**Configure Regular Channel

*/ sConfig.Channel = ADC_CHANNEL_3; sConfig.Rank = ADC_REGULAR_RANK_4; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); }

/**Configure Regular Channel

*/ sConfig.Channel = ADC_CHANNEL_6; sConfig.Rank = ADC_REGULAR_RANK_5; if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); }

}

/* USART1 init function */

static void MX_USART1_UART_Init(void){

huart1.Instance = USART1;

huart1.Init.BaudRate = 115200; huart1.Init.WordLength = UART_WORDLENGTH_8B; huart1.Init.StopBits = UART_STOPBITS_1; huart1.Init.Parity = UART_PARITY_NONE; huart1.Init.Mode = UART_MODE_TX_RX; huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE; huart1.Init.OverSampling = UART_OVERSAMPLING_16; if (HAL_MultiProcessor_Init(&huart1, 0, UART_WAKEUPMETHOD_IDLELINE) != HAL_OK) { _Error_Handler(__FILE__, __LINE__); }

}

/**

* Enable DMA controller clock */static 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, 1, 1); HAL_NVIC_EnableIRQ(DMA1_Channel1_IRQn); }

/** Configure pins as

* Analog * Input * Output * EVENT_OUT * EXTI*/static void MX_GPIO_Init(void){

GPIO_InitTypeDef GPIO_InitStruct;

/* GPIO Ports Clock Enable */

__HAL_RCC_GPIOC_CLK_ENABLE(); __HAL_RCC_GPIOA_CLK_ENABLE(); __HAL_RCC_GPIOB_CLK_ENABLE();

/*Configure GPIO pin Output Level */

HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13, GPIO_PIN_RESET);

/*Configure GPIO pin Output Level */

HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_7, GPIO_PIN_RESET);

/*Configure GPIO pin Output Level */

HAL_GPIO_WritePin(GPIOB, GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_10|GPIO_PIN_3, GPIO_PIN_SET);

/*Configure GPIO pin Output Level */

HAL_GPIO_WritePin(GPIOA, GPIO_PIN_15, GPIO_PIN_SET);

/*Configure GPIO pin : PC13 */

GPIO_InitStruct.Pin = GPIO_PIN_13; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

/*Configure GPIO pins : PA4 PA5 PA7 PA15 */

GPIO_InitStruct.Pin = GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_7|GPIO_PIN_15; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

/*Configure GPIO pins : PB0 PB1 PB10 PB3 */

GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_10|GPIO_PIN_3; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

/*Configure GPIO pins : PB13 PB14 PB15 */

GPIO_InitStruct.Pin = GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15; GPIO_InitStruct.Mode = GPIO_MODE_INPUT; GPIO_InitStruct.Pull = GPIO_NOPULL; HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

/*Configure GPIO pins : PA8 PA11 PA12 */

GPIO_InitStruct.Pin = GPIO_PIN_8|GPIO_PIN_11|GPIO_PIN_12; GPIO_InitStruct.Mode = GPIO_MODE_INPUT; GPIO_InitStruct.Pull = GPIO_NOPULL; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

}

#adc-stm32f103 #dma-adc