基于STM32F407ZGT6的ov7670例程

您好，基于STM32F407ZGT6的ov7670例程如下：

1. 首先，您需要在STM32F407ZGT6上实现I2C通信和DCMI接口配置，使其能够与OV7670相连。

2. 然后，您需要在STM32F407ZGT6上编写ov7670的驱动程序，以对其进行初始化和配置。以下是一个简单的ov7670初始化代码片段：

void ov7670_init(void)
{
    ov7670_write_reg(0x12, 0x80); // reset camera
    delay_ms(100);

    ov7670_write_reg(0x12, 0x00); // normal operation mode
    ov7670_write_reg(0x3d, 0x03); // enable PLL
    delay_ms(10);

    ov7670_write_reg(0x11, 0x01);
    ov7670_write_reg(0x3e, 0x00);
    ov7670_write_reg(0x70, 0x3a);
    ov7670_write_reg(0x71, 0x35);
    ov7670_write_reg(0x72, 0x11);
    ov7670_write_reg(0x73, 0xf0);
    ov7670_write_reg(0xa2, 0x02);
    ov7670_write_reg(0x15, 0x00);
    ov7670_write_reg(0x3f, 0x40);
    ov7670_write_reg(0x12, 0x0c);
    delay_ms(100);

    ov7670_write_reg(0x17, 0x13);
    ov7670_write_reg(0x18, 0x01);
    ov7670_write_reg(0x32, 0xb6);
    ov7670_write_reg(0x19, 0x02);
    ov7670_write_reg(0x1a, 0x7a);
    ov7670_write_reg(0x03, 0x0a);
    ov7670_write_reg(0x0c, 0x00);
    ov7670_write_reg(0x3e, 0x00);
    ov7670_write_reg(0x70, 0x3a);
    ov7670_write_reg(0x71, 0x35);
    ov7670_write_reg(0x72, 0x11);
    ov7670_write_reg(0x73, 0xf0);
    ov7670_write_reg(0xa2, 0x02);
    ov7670_write_reg(0x15, 0x00);
    ov7670_write_reg(0x40, 0xd0);
    ov7670_write_reg(0x41, 0x20);
    ov7670_write_reg(0x42, 0x20);
    ov7670_write_reg(0x43, 0x20);
    ov7670_write_reg(0x44, 0x20);
    ov7670_write_reg(0x45, 0x20);
    ov7670_write_reg(0x46, 0x20);
    ov7670_write_reg(0x47, 0x20);
    delay_ms(100);
}

3. 接下来，您需要编写DCMI的中断处理程序，以便在图像数据准备就绪时读取图像数据。以下是一个简单的DCMI中断处理程序代码片段：

void DCMI_IRQHandler(void)
{
    if (DCMI_GetITStatus(DCMI_IT_FRAME) != RESET)
    {
        DCMI_ClearITPendingBit(DCMI_IT_FRAME);

        if (image_ready == 0)
        {
            DCMI_CaptureCmd(DISABLE);

            for (i = 0; i < IMAGE_HEIGHT; i++)
            {
                for (j = 0; j < IMAGE_WIDTH; j++)
                {
                    image_buffer[i][j] = *(__IO uint16_t*) (LCD_FRAME_BUFFER + (i * IMAGE_WIDTH + j) * 2);
                }
            }

            image_ready = 1;
        }

        DCMI_CaptureCmd(ENABLE);
    }
}

4. 最后，您可以通过UART等串口通信方式将采集到的图像数据传输到计算机上进行处理和显示。以下是一个简单的UART发送代码片段：

void uart_send_image(void)
{
    uint32_t i, j;
    uint8_t pixel_data[2];

    for (i = 0; i < IMAGE_HEIGHT; i++)
    {
        for (j = 0; j < IMAGE_WIDTH; j++)
        {
            pixel_data[0] = (uint8_t) (image_buffer[i][j] >> 8);
            pixel_data[1] = (uint8_t) image_buffer[i][j];
            USART_SendData(USART1, pixel_data[0]);
            while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
            USART_SendData(USART1, pixel_data[1]);
            while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
        }
    }
}

希望这个例程能够对您有所帮助！