Embedded 使用带DMA的STM32L4 ADC读取成像传感器
我读了很多关于如何进行多通道ADC读数的书。我的第一次成功是通过民意测验转化。然后我设法用DMA切换到ADC,但我被我的新目标卡住了。我想读取图像传感器的模拟输出。我不会用完整的循环来打扰您,但基本上最重要的是列的循环:Embedded 使用带DMA的STM32L4 ADC读取成像传感器,embedded,stm32,dma,adc,Embedded,Stm32,Dma,Adc,我读了很多关于如何进行多通道ADC读数的书。我的第一次成功是通过民意测验转化。然后我设法用DMA切换到ADC,但我被我的新目标卡住了。我想读取图像传感器的模拟输出。我不会用完整的循环来打扰您,但基本上最重要的是列的循环: 设置像素列的8位地址(带BSRR的8个GPIO引脚) 在读取模拟输出之前等待40ns(由于计算造成的时间延迟,如有必要,添加一些NOP) 读取两个输出(同时读取两个像素)并使用它们进行一些计算 使用通道选择和轮询进行转换非常慢,我希望每秒有几帧(越多越好)。 我试着在扫描模式下
static void MX_ADC1_Init(void)
{
ADC_ChannelConfTypeDef sConfig = {0};
hadc1.Instance = ADC1;
hadc1.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
hadc1.Init.Resolution = ADC_RESOLUTION_12B;
hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc1.Init.ScanConvMode = ADC_SCAN_ENABLE;
hadc1.Init.EOCSelection = ADC_EOC_SEQ_CONV;
hadc1.Init.LowPowerAutoWait = DISABLE;
hadc1.Init.ContinuousConvMode = ENABLE;
hadc1.Init.NbrOfConversion = 2;
hadc1.Init.NbrOfDiscConversion = 0;
hadc1.Init.DiscontinuousConvMode = DISABLE;
hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc1.Init.DMAContinuousRequests = ENABLE;
hadc1.Init.Overrun = ADC_OVR_DATA_PRESERVED;
hadc1.Init.OversamplingMode = DISABLE;
if (HAL_ADC_Init(&hadc1) != HAL_OK)
{
Error_Handler();
}
sConfig.Channel = ADC_CHANNEL_1;
sConfig.Rank = 1;
sConfig.SamplingTime = ADC_SAMPLETIME_12CYCLES_5;
sConfig.SingleDiff = ADC_SINGLE_ENDED;
sConfig.OffsetNumber = ADC_OFFSET_NONE;
sConfig.Offset = 0;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
Error_Handler();
}
sConfig.Channel = ADC_CHANNEL_2;
sConfig.Rank = 2;
if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
{
Error_Handler();
}
HAL_NVIC_SetPriority(ADC1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(ADC1_IRQn);
}
static void MX_DMA_Init(void)
{
/* DMA controller clock enable */
__HAL_RCC_DMAMUX1_CLK_ENABLE();
__HAL_RCC_DMA2_CLK_ENABLE();
__DMA2_CLK_ENABLE();
/* DMA interrupt init */
hdma_adc1.Instance = DMA2_Channel3;
hdma_adc1.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_adc1.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_adc1.Init.MemInc = DMA_MINC_ENABLE;
hdma_adc1.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_adc1.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
hdma_adc1.Init.Mode = DMA_CIRCULAR;
hdma_adc1.Init.Priority = DMA_PRIORITY_HIGH;
//HAL_DMA_DeInit(&hdma_adc1);
HAL_DMA_Init(&hdma_adc1);
__HAL_LINKDMA(&hadc1, DMA_Handle, hdma_adc1);
DMAMUX1_Channel9->CCR = 0x5;
/* DMA interrupt init */
/* DMA1_Channel1_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMA2_Channel3_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA2_Channel3_IRQn);
/* DMAMUX1_OVR_IRQn interrupt configuration */
HAL_NVIC_SetPriority(DMAMUX1_OVR_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMAMUX1_OVR_IRQn);
}
//somewhere in main.c, the read out loop:
uint32_t ADCBuffer[2];
GPIOF -> BSRR = (col) | (((~col) & 0xFF) << (16)); //r_col case, F0:7
HAL_ADC_Start_DMA(&hadc1, ADCBuffer, 2);
//And the callbacks and handlers in STM32L4xx_it.c:
void DMA2_Channel3_IRQHandler(void)
{
HAL_DMA_IRQHandler(&hdma_adc1);
HAL_ADC_IRQHandler(&hadc1);
}
void HAL_ADC_ConvCpltCallback(ADC_HandleTypeDef* hadc) {
if(vCol==159){
HAL_ADC_Stop_DMA(hadc);
}
}
void HAL_ADC_ConvHalfCpltCallback(ADC_HandleTypeDef *hadc)
{
vCol++;
GPIOF -> BSRR = (vCol) | (((~vCol) & 0xFF) << (16)); //r_col case, F0:7
rsum = rsum + ADCBuffer[0] + ADCBuffer[1];
}
void ADC_IRQHandler()
{
HAL_ADC_IRQHandler(&hadc1);
}
static void MX_ADC1_Init(void)
{
ADC_ChannelConfTypeDef sConfig={0};
hadc1.Instance=ADC1;
hadc1.Init.ClockPrescaler=ADC\u CLOCK\u ASYNC\u DIV1;
hadc1.Init.Resolution=ADC_Resolution_12B;
hadc1.Init.DataAlign=ADC\u DataAlign\u RIGHT;
hadc1.Init.ScanConvMode=ADC\u SCAN\u ENABLE;
hadc1.Init.EOCSelection=ADC_EOC_SEQ_CONV;
hadc1.Init.LowPowerAutoWait=禁用;
hadc1.Init.ContinuousConvMode=启用;
hadc1.Init.nbrof转换=2;
hadc1.Init.nbrofdisconversion=0;
hadc1.Init.DiscontinuousConvMode=禁用;
hadc1.Init.ExternalTrigConv=ADC\u软件\u启动;
hadc1.Init.externaltrigconverge=ADC_externaltrigconverge_NONE;
hadc1.Init.DMAContinuousRequests=ENABLE;
hadc1.Init.overflow=ADC\u OVR\u数据保存;
hadc1.Init.OversamplingMode=禁用;
if(HAL_ADC_Init(&hadc1)!=HAL_OK)
{
错误处理程序();
}
sConfig.Channel=ADC\u Channel\u 1;
sConfig.Rank=1;
sConfig.SamplingTime=ADC_SAMPLETIME_12周期_5;
sConfig.SingleDiff=ADC\u SINGLE\u end;
sConfig.OffsetNumber=ADC\u OFFSET\u NONE;
sConfig.Offset=0;
if(HAL_ADC_配置通道(&hadc1,&sConfig)!=HAL_正常)
{
错误处理程序();
}
sConfig.Channel=ADC\u Channel\u 2;
sConfig.Rank=2;
if(HAL_ADC_配置通道(&hadc1,&sConfig)!=HAL_正常)
{
错误处理程序();
}
HAL_NVIC_SetPriority(ADC1_IRQn,0,0);
HAL_NVIC_EnableIRQ(ADC1_IRQn);
}
静态void MX_DMA_Init(void)
{
/*DMA控制器时钟启用*/
__HAL_RCC_DMAMUX1_CLK_ENABLE();
__HAL_RCC_DMA2_CLK_ENABLE();
__DMA2_时钟_启用();
/*DMA中断初始化*/
hdma_adc1.Instance=DMA2_Channel3;
hdma_adc1.Init.Direction=DMA_PERIPH_TO_内存;
hdma_adc1.Init.PeriphInc=DMA_PINC_DISABLE;
hdma_adc1.Init.MemInc=DMA_MINC_ENABLE;
hdma_adc1.Init.PeriphDataAlignment=DMA_PDATAALIGN_字;
hdma_adc1.Init.MemDataAlignment=DMA_MDATAALIGN_字;
hdma_adc1.Init.Mode=DMA_循环;
hdma_adc1.Init.Priority=DMA_Priority_HIGH;
//HAL_DMA_Denit(&hdma_adc1);
HAL_DMA_Init(&hdma_adc1);
__HAL_LINKDMA(和hadc1、DMA_句柄、hdma_adc1);
DMAMUX1_信道9->CCR=0x5;
/*DMA中断初始化*/
/*DMA1\U通道1\U IRQn中断配置*/
HAL_NVIC_SetPriority(DMA2_信道3_IRQn,0,0);
HAL_NVIC_EnableIRQ(DMA2_信道3_IRQn);
/*DMAMUX1_OVR_IRQn中断配置*/
HAL_NVIC_SetPriority(DMAMUX1_OVR_IRQn,0,0);
HAL_NVIC_EnableIRQ(DMAMUX1_OVR_IRQn);
}
//在main.c中的某个地方,读取循环:
uint32_t ADCBuffer[2];
GPIOF->BSRR=(col)|((~col)和0xFF)BSRR=(vCol)|((~vCol)和0xFF)为每个像素触发一个中断是毫无意义的。进入和离开中断的开销,特别是HAL开销太大。行方式当然是可行的。这种方式可以有固定的时间来设置地址和采样值。采样端可以通过定时器实现gger ADC和ADC使用DMA存储整行。我不太熟悉基于计时器的机制来设置列地址以及如何同步两个并行操作。另一种方法是使用低级别(直接注册