写一段ov5640在stm32h7单片机上的驱动程序

以下是一个简单的OV5640摄像头在STM32H7单片机上的驱动程序示例。本示例使用了STM32H743ZI开发板和OV5640摄像头模块。

#include "ov5640_driver.h"
#include "stm32h7xx_hal.h"

// OV5640寄存器定义
#define OV5640_CHIPID_HIGH 0x300A
#define OV5640_CHIPID_LOW 0x300B

// OV5640 I2C地址
#define OV5640_I2C_ADDR 0x78

// OV5640初始化寄存器值
const uint8_t ov5640_init_reg[][2] = {
    {0x31, 0x03},
    {0x32, 0x00},
    {0x2d, 0x00},
    {0x2e, 0x00},
    {0x2f, 0x00},
    {0x33, 0xa0},
    {0x3a, 0x04},
    {0x3b, 0x38},
    {0x3c, 0x00},
    {0x3d, 0x28},
    {0x3e, 0x00},
    {0x3f, 0x60},
    {0x40, 0x7f},
    {0x41, 0x6b},
    {0x42, 0x29},
    {0x44, 0x22},
    {0x45, 0x0a},
    {0x46, 0x04},
    {0x4a, 0x11},
    {0x4b, 0x01},
    {0x4c, 0x20},
    {0x4d, 0x00},
    {0x4e, 0x00},
    {0x4f, 0x00},
    {0x50, 0x22},
    {0x51, 0x2a},
    {0x52, 0x3c},
    {0x53, 0x00},
    {0x54, 0x00},
    {0x55, 0x88},
    {0x56, 0x28},
    {0x57, 0x00},
    {0x58, 0x00},
    {0x59, 0x00},
    {0x5a, 0x50},
    {0x5b, 0x3c},
    {0x5c, 0x00},
    {0x5d, 0x55},
    {0x5e, 0x7d},
    {0x63, 0x00},
    {0x64, 0x02},
    {0x65, 0x20},
    {0x66, 0x00},
    {0x69, 0x0a},
    {0x6a, 0x38},
    {0x6b, 0x01},
    {0x6c, 0x00},
    {0x6d, 0x02},
    {0x6e, 0xd0},
    {0x6f, 0x01},
    {0x70, 0x00},
    {0x71, 0x58},
    {0x72, 0x80},
    {0x73, 0x02},
    {0x74, 0x10},
    {0x75, 0x10},
    {0x76, 0x01},
    {0x77, 0x80},
    {0x7a, 0x20},
    {0x7b, 0x1c},
    {0x7c, 0x28},
    {0x7d, 0x3c},
    {0x7e, 0x55},
    {0x7f, 0x68},
    {0x80, 0x76},
    {0x81, 0x80},
    {0x82, 0x88},
    {0x83, 0x8f},
    {0x84, 0x96},
    {0x85, 0xa3},
    {0x86, 0xaf},
    {0x87, 0xc4},
    {0x88, 0xd7},
    {0x89, 0xe8},
    {0x8a, 0x20},
    {0x8c, 0x80},
    {0x90, 0xc8},
    {0x91, 0x00},
    {0x92, 0x00},
    {0x93, 0x00},
    {0x94, 0x55},
    {0x95, 0x46},
    {0x96, 0x2d},
    {0x97, 0x24},
    {0x98, 0x1f},
    {0x99, 0x1a},
    {0x9a, 0x16},
    {0x9b, 0x13},
    {0x9c, 0x0f},
    {0x9d, 0x0d},
    {0x9e, 0x0b},
    {0x9f, 0x09},
    {0xa0, 0x07},
    {0xa1, 0x00},
    {0xa2, 0x00},
    {0xa3, 0x00},
    {0xa4, 0x00},
    {0xa5, 0x00},
    {0xa6, 0x00},
    {0xa7, 0x00},
    {0xa8, 0x00},
    {0xa9, 0x00},
    {0xaa, 0x00},
    {0xab, 0x00},
    {0xac, 0x00},
    {0xad, 0x00},
    {0xae, 0x00},
    {0xaf, 0x00},
    {0xb0, 0x00},
    {0xb1, 0x00},
    {0xb2, 0x00},
    {0xb3, 0x00},
    {0xb4, 0x00},
    {0xb5, 0x00},
    {0xb6, 0x00},
    {0xb7, 0x00},
    {0xb8, 0x00},
    {0xb9, 0x00},
    {0xba, 0x00},
    {0xbb, 0x00},
    {0xbc, 0x00},
    {0xbd, 0x00},
    {0xbe, 0x00},
    {0xbf, 0x00},
    {0xc0, 0x00},
    {0xc1, 0x10},
    {0xc2, 0x20},
    {0xc3, 0x30},
    {0xc4, 0x40},
    {0xc5, 0x50},
    {0xc6, 0x60},
    {0xc7, 0x70},
    {0xc8, 0x80},
    {0xc9, 0x90},
    {0xca, 0xa0},
    {0xcb, 0xb0},
    {0xcc, 0xc0},
    {0xcd, 0xd0},
    {0xce, 0xe0},
    {0xcf, 0xf0},
    {0xd0, 0x00},
    {0xd1, 0x04},
    {0xd2, 0x10},
    {0xd3, 0x28},
    {0xd4, 0x3c},
    {0xd5, 0x50},
    {0xd6, 0x64},
    {0xd7, 0x7c},
    {0xd8, 0x8c},
    {0xd9, 0x9c},
    {0xda, 0xb0},
    {0xdb, 0xc4},
    {0xdc, 0xd8},
    {0xdd, 0xf0},
    {0xde, 0x20},
    {0xdf, 0x04},
    {0xe0, 0x02},
    {0xe1, 0x00},
    {0xe2, 0x03},
    {0xe3, 0x30},
    {0xe4, 0x80},
    {0xe5, 0x00},
    {0xe6, 0x00},
    {0xe7, 0x00},
    {0xe8, 0x00},
    {0xe9, 0x00},
    {0xea, 0x00},
    {0xeb, 0x00},
    {0xec, 0x00},
    {0xed, 0x00},
    {0xee, 0x00},
    {0xef, 0x00},
    {0xf0, 0x00},
    {0xf1, 0x00},
    {0xf2, 0x00},
    {0xf3, 0x00},
    {0xf4, 0x00},
    {0xf5, 0x00},
    {0xf6, 0x00},
    {0xf7, 0x00},
    {0xf8, 0x00},
    {0xf9, 0x00},
    {0xfa, 0x00},
    {0xfe, 0x00},
};

I2C_HandleTypeDef hi2c1;

// 初始化I2C接口
static void OV5640_I2C_Init(void)
{
    hi2c1.Instance = I2C1;
    hi2c1.Init.Timing = 0x00707CBB;
    hi2c1.Init.OwnAddress1 = 0;
    hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
    hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
    hi2c1.Init.OwnAddress2 = 0;
    hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
    hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
    hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
    if (HAL_I2C_Init(&hi2c1) != HAL_OK)
    {
        Error_Handler();
    }
}

// 写入OV5640寄存器
static HAL_StatusTypeDef OV5640_WriteReg(uint16_t reg, uint8_t value)
{
    uint8_t data[2];
    data[0] = reg >> 8;
    data[1] = reg & 0xFF;
    if (HAL_I2C_Master_Transmit(&hi2c1, OV5640_I2C_ADDR, data, 2, 1000) != HAL_OK)
    {
        return HAL_ERROR;
    }
    data[0] = value;
    if (HAL_I2C_Master_Transmit(&hi2c1, OV5640_I2C_ADDR, data, 1, 1000) != HAL_OK)
    {
        return HAL_ERROR;
    }
    return HAL_OK;
}

// 读取OV5640寄存器
static HAL_StatusTypeDef OV5640_ReadReg(uint16_t reg, uint8_t *value)
{
    uint8_t data[2];
    data[0] = reg >> 8;
    data[1] = reg & 0xFF;
    if (HAL_I2C_Master_Transmit(&hi2c1, OV5640_I2C_ADDR, data, 2, 1000) != HAL_OK)
    {
        return HAL_ERROR;
    }
    if (HAL_I2C_Master_Receive(&hi2c1, OV5640_I2C_ADDR, value, 1, 1000) != HAL_OK)
    {
        return HAL_ERROR;
    }
    return HAL_OK;
}

// 初始化OV5640
void OV5640_Init(void)
{
    OV5640_I2C_Init();
    uint8_t chip_id_high, chip_id_low;
    OV5640_ReadReg(OV5640_CHIPID_HIGH, &chip_id_high);
    OV5640_ReadReg(OV5640_CHIPID_LOW, &chip_id_low);
    if (chip_id_high != 0x56 || chip_id_low != 0x40)
    {
        Error_Handler();
    }
    for (uint32_t i = 0; i < sizeof(ov5640_init_reg) / sizeof(ov5640_init_reg[0]); i++)
    {
        OV5640_WriteReg(ov5640_init_reg[i][0], ov5640_init_reg[i][1]);
    }
}

// 获得OV5640的ID
uint16_t OV5640_GetID(void)
{
    uint8_t chip_id_high, chip_id_low;
    OV5640_ReadReg(OV5640_CHIPID_HIGH, &chip_id_high);
    OV5640_ReadReg(OV5640_CHIPID_LOW, &chip_id_low);
    return (chip_id_high << 8) | chip_id_low;
}

以上代码仅为示例，具体实现可能需要根据具体硬件和软件环境进行修改和优化。