H745驱动OV2640数据为00但通信正常

shenyixuan 提问时间：2024-8-3 19:49 / 未解决

问答
是否解决:	未解决

使用nucleo-h745zi-q驱动OV2640 dcmi使用cubemx初始化后直接连线具体为PC6, PC7, PC8, PC9, PD3, PE4, PE5, PE6-D0, D1, D2, D3, D4, D5, D6, D7
PA4-HREF
PG9-VSYNC
PB6-SCL
PB7-SDA

PD12-PWDN
PD13-RST
左边是板子的右边是OV2640上的引脚还有一个NC悬空  现在SCCB通信在示波器上看正常  但是回传数据均为0 程序主函数如下

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file          : main.c
  * @brief       : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2024 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "string.h"

#include <stdio.h>
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "ov2640.h"
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */

#ifndef HSEM_ID_0
#define HSEM_ID_0 (0U) /* HW semaphore 0*/
#endif

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
#if defined ( __ICCARM__ ) /*!< IAR Compiler */
#pragma location=0x30000000
ETH_DMADescTypeDef  DMARxDscrTab[ETH_RX_DESC_CNT]; /* Ethernet Rx DMA Descriptors */
#pragma location=0x30000080
ETH_DMADescTypeDef  DMATxDscrTab[ETH_TX_DESC_CNT]; /* Ethernet Tx DMA Descriptors */

#elif defined ( __CC_ARM )  /* MDK ARM Compiler */

__attribute__((at(0x30000000))) ETH_DMADescTypeDef  DMARxDscrTab[ETH_RX_DESC_CNT]; /* Ethernet Rx DMA Descriptors */
__attribute__((at(0x30000080))) ETH_DMADescTypeDef  DMATxDscrTab[ETH_TX_DESC_CNT]; /* Ethernet Tx DMA Descriptors */

#elif defined ( __GNUC__ ) /* GNU Compiler */

ETH_DMADescTypeDef DMARxDscrTab[ETH_RX_DESC_CNT] __attribute__((section(".RxDecripSection"))); /* Ethernet Rx DMA Descriptors */
ETH_DMADescTypeDef DMATxDscrTab[ETH_TX_DESC_CNT] __attribute__((section(".TxDecripSection"))); /* Ethernet Tx DMA Descriptors */
#endif

ETH_TxPacketConfig TxConfig;

DCMI_HandleTypeDef hdcmi;
DMA_HandleTypeDef hdma_dcmi;

ETH_HandleTypeDef heth;

UART_HandleTypeDef huart3;

/* USER CODE BEGIN PV */
HAL_StatusTypeDef dcmi_dma_status = HAL_OK;
uint8_t ov2640_verh = 0xff, ov2640_verl=0xff;
uint32_t dcmi_data_buff[16000]={0};
uint32_t DCMI_RN = 0;  //row number
uint32_t DCMI_CN = 0;  //column number
uint32_t DCMI_RS = 0;  //row start
uint32_t DCMI_CS = 0;  //column start
uint8_t tx_busy = 0;
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_DCMI_Init(void);
static void MX_ETH_Init(void);
static void MX_USART3_UART_Init(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
#define PUTCHAR_PROTOTYPE int fputc(int ch, FILE *f)
PUTCHAR_PROTOTYPE
{
USART3->TDR = ch;
while(!(USART3->ISR& USART_ISR_TXE_TXFNF_Msk))
{;}
   return ch;
}

void Send(uint8_t *pData,int jpglen)
{
  uint32_t i = 0;
  //printf("jpeg data size:%d\r\n",JPEG_BUFFER_LENGTH);
  HAL_Delay(1000);
  for(i = 0;i < jpglen;i++)
  {
//printf("%02x\t",pData);
printf("%c",pData);
  }
  HAL_Delay(1000);
  printf("\r\n");
}
void PY_OV2640_RGB565_CONFIG(void)
{
/*Camera Interface*/
SCCB_Rst();    //hard reset
HAL_Delay(100);

      //SCCB_WR_Reg(0xff, 0x01); //soft reset
      //SCCB_WR_Reg(0x12, 0x80);
      //HAL_Delay(100);

      ov2640_verh = SCCB_RD_Reg(0x1c);
      HAL_Delay(50);
      ov2640_verl = SCCB_RD_Reg(0x1d);
      HAL_Delay(50);

      while ((ov2640_verh==0xff)||(ov2640_verl==0xff))
      {
            HAL_UART_Transmit(&huart3, &ov2640_verh, 1, 0xFFFFFF);
            HAL_Delay(500);
            HAL_UART_Transmit(&huart3, &ov2640_verl, 1, 0xFFFFFF);
            HAL_Delay(500);
      }

      OV2640_UXGA_Init();

      //pix speed adjustment
      SCCB_WR_Reg(0xff, 0x00);
      SCCB_WR_Reg(0xd3, 0x00);
      SCCB_WR_Reg(0XFF, 0X01);
      SCCB_WR_Reg(0X11, 0x01);

      OV2640_RGB565_Mode();

  OV2640_OutSize_Set(640, 480);
      HAL_Delay(200);

}
/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{

  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */
/* USER CODE BEGIN Boot_Mode_Sequence_0 */
  int32_t timeout;
/* USER CODE END Boot_Mode_Sequence_0 */

/* USER CODE BEGIN Boot_Mode_Sequence_1 */
  /* Wait until CPU2 boots and enters in stop mode or timeout*/
  timeout = 0xFFFF;
  while((__HAL_RCC_GET_FLAG(RCC_FLAG_D2CKRDY) != RESET) && (timeout-- > 0));
  if ( timeout < 0 )
  {
  Error_Handler();
  }
/* USER CODE END Boot_Mode_Sequence_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 Boot_Mode_Sequence_2 */
/* When system initialization is finished, Cortex-M7 will release Cortex-M4 by means of
HSEM notification */
/*HW semaphore Clock enable*/
__HAL_RCC_HSEM_CLK_ENABLE();
/*Take HSEM */
HAL_HSEM_FastTake(HSEM_ID_0);
/*Release HSEM in order to notify the CPU2(CM4)*/
HAL_HSEM_Release(HSEM_ID_0,0);
/* wait until CPU2 wakes up from stop mode */
timeout = 0xFFFF;
while((__HAL_RCC_GET_FLAG(RCC_FLAG_D2CKRDY) == RESET) && (timeout-- > 0));
if ( timeout < 0 )
{
Error_Handler();
}
/* USER CODE END Boot_Mode_Sequence_2 */

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_DMA_Init();
  MX_DCMI_Init();
  MX_ETH_Init();
  MX_USART3_UART_Init();
  /* USER CODE BEGIN 2 */
      PY_OV2640_RGB565_CONFIG();
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
/* USER CODE END WHILE */
            dcmi_dma_status = HAL_DCMI_Init(&hdcmi);
            for (uint8_t i=0; i<10;i++)
            {
                           HAL_DCMI_DisableCrop (&hdcmi);

                           DCMI_RN = 48;
                           DCMI_CN = 1280;

                           DCMI_RS = 48*i;
                           DCMI_CS = 0;

                           HAL_DCMI_ConfigCrop (&hdcmi, DCMI_CS, DCMI_RS, DCMI_CN, DCMI_RN);
                           HAL_Delay(1);
                           HAL_DCMI_EnableCrop (&hdcmi);
                           HAL_Delay(1);

                           dcmi_dma_status = HAL_DCMI_Start_DMA(&hdcmi, DCMI_MODE_SNAPSHOT, dcmi_data_buff, DCMI_CN*DCMI_RN/4);

                           while(HAL_DMA_GetState(&hdma_dcmi)==HAL_DMA_STATE_BUSY) ;
                           HAL_DCMI_Stop(&hdcmi);

                        tx_busy = 1;
                           Send((uint8_t *)dcmi_data_buff, 61440);
                           while(tx_busy!=0) ;
            }

         }

/* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */