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HAL+STM32F429I DISCOVERY+DCMI+DMA

mitjaneho
Associate II

‎2015-11-09 03:44 AM

Posted on November 09, 2015 at 12:44

I am only posting this as a last resort after making sure that I could nothing more about it. Just need fresh pair of eyes to check if I have missed out something.

I am trying to use the HAL library to interface a POA030R image sensor (custom board) with the STM32F429I DISCOVERY Board through DCMI using DMA to store buffer on the internal memory. Right now the issue is: 1. The camera is shooting blanks (0x00h) 2. Which i checked with the PCLK and there's basically nothing (used digital oscilloscope) My code is as follows: my main(void) code: 

HAL_Init();
/* Configure the system clock to 180 MHz */
SystemClock_Config();
/* Configure MCO1 as 5 MHz for image sensor clock */
HAL_RCC_MCOConfig (RCC_MCO1, RCC_MCO1SOURCE_PLLCLK, RCC_MCODIV_2); 
/* POA030R Camera function calls */
Configure_POA030R();
/* Initialize DMA and then DCMI */
POA030R_Init();
/* Extract Image */
POA030R_ImageOut();
/* Infinite loop */
while (1)
{
}

Configure_POA030R function basically calls on I2C to configure the internal registers to set the mode to QVGA in YCbCr (Y Cb Y Cr) format The POA030R_Init() function is where I initialize DMA and DCMI 

static void POA030R_Init(void)
{
static DMA_HandleTypeDef hdma_poa030r;
GPIO_InitTypeDef GPIO_Init_Structure;
DCMI_HandleTypeDef *hdcmi = &hdcmi_poa030r;
/*** Enable peripherals and GPIO clocks ***/
/* Enable DCMI clock */
__DCMI_CLK_ENABLE();
/* Enable DMA2 clock */
__DMA2_CLK_ENABLE(); 
/* Enable GPIO clocks */
__GPIOA_CLK_ENABLE();
__GPIOB_CLK_ENABLE();
__GPIOC_CLK_ENABLE();
__GPIOD_CLK_ENABLE();
__GPIOE_CLK_ENABLE();
/*** Configure the GPIO ***/
/* Configure DCMI GPIO as alternate function */
/* PA4 HREF 
PA6 PIXCLK */
GPIO_Init_Structure.Pin = GPIO_PIN_4 | GPIO_PIN_6; 
GPIO_Init_Structure.Mode = GPIO_MODE_AF_PP;
GPIO_Init_Structure.Pull = GPIO_PULLUP;
GPIO_Init_Structure.Speed = GPIO_SPEED_HIGH;
GPIO_Init_Structure.Alternate = GPIO_AF13_DCMI; 
HAL_GPIO_Init(GPIOA, &GPIO_Init_Structure);
/* PB7 VSYNC */
GPIO_Init_Structure.Pin = GPIO_PIN_7 | GPIO_PIN_8; 
GPIO_Init_Structure.Mode = GPIO_MODE_AF_PP;
GPIO_Init_Structure.Pull = GPIO_PULLUP;
GPIO_Init_Structure.Speed = GPIO_SPEED_HIGH;
GPIO_Init_Structure.Alternate = GPIO_AF13_DCMI; 
HAL_GPIO_Init(GPIOB, &GPIO_Init_Structure);
/* PC6 D0
PC7 D1
PC11 D4 */
GPIO_Init_Structure.Pin = GPIO_PIN_6 | GPIO_PIN_7 | GPIO_PIN_11; 
GPIO_Init_Structure.Mode = GPIO_MODE_AF_PP;
GPIO_Init_Structure.Pull = GPIO_PULLUP;
GPIO_Init_Structure.Speed = GPIO_SPEED_HIGH;
GPIO_Init_Structure.Alternate = GPIO_AF13_DCMI; 
HAL_GPIO_Init(GPIOC, &GPIO_Init_Structure);
/* PD3 D5 */
GPIO_Init_Structure.Pin = GPIO_PIN_3; 
GPIO_Init_Structure.Mode = GPIO_MODE_AF_PP;
GPIO_Init_Structure.Pull = GPIO_PULLUP;
GPIO_Init_Structure.Speed = GPIO_SPEED_HIGH;
GPIO_Init_Structure.Alternate = GPIO_AF13_DCMI; 
HAL_GPIO_Init(GPIOD, &GPIO_Init_Structure);
/* PE0 D2
PE1 D3
PE5 D6 
PE6 D7 */
GPIO_Init_Structure.Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_5 |\
GPIO_PIN_6; 
GPIO_Init_Structure.Mode = GPIO_MODE_AF_PP;
GPIO_Init_Structure.Pull = GPIO_PULLUP;
GPIO_Init_Structure.Speed = GPIO_SPEED_HIGH;
GPIO_Init_Structure.Alternate = GPIO_AF13_DCMI; 
HAL_GPIO_Init(GPIOE, &GPIO_Init_Structure); 
/*** Configure the DMA ***/
/* Set the parameters to be configured */
hdma_poa030r.Init.Channel = DMA_CHANNEL_1;
hdma_poa030r.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_poa030r.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_poa030r.Init.MemInc = DMA_MINC_ENABLE;
hdma_poa030r.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_poa030r.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
hdma_poa030r.Init.Mode = DMA_CIRCULAR;
hdma_poa030r.Init.Priority = DMA_PRIORITY_VERY_HIGH;
hdma_poa030r.Init.FIFOMode = DMA_FIFOMODE_DISABLE; 
hdma_poa030r.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;
hdma_poa030r.Init.MemBurst = DMA_MBURST_SINGLE;
hdma_poa030r.Init.PeriphBurst = DMA_PBURST_SINGLE; 
hdma_poa030r.Instance = DMA2_Stream1;
/* Associate the initialized DMA handle to the DCMI handle */
__HAL_LINKDMA(hdcmi, DMA_Handle, hdma_poa030r);
/*** Configure the NVIC for DCMI and DMA ***/
/* NVIC configuration for DCMI transfer complete interrupt */
HAL_NVIC_SetPriority(DCMI_IRQn, 5, 0);
HAL_NVIC_EnableIRQ(DCMI_IRQn); 
/* NVIC configuration for DMA2D transfer complete interrupt */
HAL_NVIC_SetPriority(DMA2_Stream1_IRQn, 5, 0);
HAL_NVIC_EnableIRQ(DMA2_Stream1_IRQn);
/* Configure the DMA stream */
HAL_DMA_Init(hdcmi->DMA_Handle); 
/* Configure DCMI for POA030R*/
DCMI_POA030R_Init();
}
static void DCMI_POA030R_Init(void)
{
DCMI_HandleTypeDef *phdcmi = &hdcmi_poa030r;
/* Configure the DCMI to interface with POA030R Sensor */
phdcmi->Init.CaptureRate = DCMI_CR_ALL_FRAME;
phdcmi->Init.HSPolarity = DCMI_HSPOLARITY_LOW;
phdcmi->Init.SynchroMode = DCMI_SYNCHRO_HARDWARE;
phdcmi->Init.VSPolarity = DCMI_VSPOLARITY_LOW;
phdcmi->Init.ExtendedDataMode = DCMI_EXTEND_DATA_8B;
phdcmi->Init.PCKPolarity = DCMI_PCKPOLARITY_RISING;
phdcmi->Instance = DCMI;
HAL_DCMI_Init(phdcmi);
}

After that I call in the POA030R_ImageOut function to spit out the image 

static void POA030R_ImageOut(void)
{
HAL_DCMI_Start_DMA(&hdcmi_poa030r, DCMI_MODE_SNAPSHOT, (uint32_t) POA030R_BUFFER, 0x9600);
/*Random check of value*/
printf (''0x%x\n\r'', POA030R_BUFFER[2]);
}

0x9600 refers to hex value of (320*240*2/4) where 320*240*2 total size in Bytes divided by word transfer (4Bytes) so 0x9600 is the DMA buffer size the buffer is declared as: 

/* Buffer for image as defined in main.h */
uint8_t POA030R_BUFFER[IMAGE_BUFFER_SIZE];
/* For POA030R receive buffer (QVGA) [main.h] */
#define PIXEL_WIDTH 320
#define PIXEL_HEIGHT 240
#define PER_PIXEL_BYTES 2 /* Average of 2 Bytes per pixel */ 
#define IMAGE_BUFFER_SIZE (PIXEL_WIDTH * PIXEL_HEIGHT * PER_PIXEL_BYTES)

I have placed my interrupts on the main.c file. They have been declared as: 

/**
* @brief This function handles DMA2 Stream1 interrupt request.
* @param None
* @retval None
*/
void DMA2_Stream1_IRQHandler(void)
{
HAL_DMA_IRQHandler(hdcmi_poa030r.DMA_Handle);
}
/**
* @brief This function handles DCMI interrupt request.
* @param None
* @retval None
*/
void DCMI_IRQHandler(void)
{
HAL_DCMI_IRQHandler(&hdcmi_poa030r);
}

If anyone could let me know what the issue is, i would be more than grateful. Thanks in advanced! #cmos #dcmi #stm32f429i #dma
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