STM32F103VET6驱动OV7670代码，以及引脚接线图

以下是一个简单的 OV7670 摄像头驱动代码，可以在 STM32F103VET6 上运行，同时也包含了引脚接线图。需要注意的是，OV7670 摄像头的引脚定义可能会因不同的厂商而有所不同，因此需要根据具体的摄像头进行修改。

#include "stm32f10x.h"
#include "delay.h"
#include "ov7670.h"

#define OV7670_RESET_PIN GPIO_Pin_8
#define OV7670_RESET_PORT GPIOA
#define OV7670_PWDN_PIN GPIO_Pin_1
#define OV7670_PWDN_PORT GPIOB

void ov7670_init(void)
{
    GPIO_InitTypeDef GPIO_InitStruct;

    /* 初始化 RESET 引脚 */
    GPIO_InitStruct.GPIO_Pin = OV7670_RESET_PIN;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(OV7670_RESET_PORT, &GPIO_InitStruct);

    /* 初始化 PWDN 引脚 */
    GPIO_InitStruct.GPIO_Pin = OV7670_PWDN_PIN;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(OV7670_PWDN_PORT, &GPIO_InitStruct);

    /* 复位 OV7670 */
    GPIO_ResetBits(OV7670_RESET_PORT, OV7670_RESET_PIN);
    delay_ms(50);
    GPIO_SetBits(OV7670_RESET_PORT, OV7670_RESET_PIN);
    delay_ms(50);

    /* 关闭电源 */
    GPIO_ResetBits(OV7670_PWDN_PORT, OV7670_PWDN_PIN);
    delay_ms(50);

    /* 初始化寄存器 */
    ov7670_write_reg(0x12, 0x80); // RESET
    delay_ms(100);
    ov7670_write_reg(0x12, 0x00); // RESET

    /* 设置输出格式为 YUV422 */
    ov7670_write_reg(0x12, 0x00); // COM7
    ov7670_write_reg(0x40, 0xd0); // COM15
    ov7670_write_reg(0x41, 0x10); // COM16
    ov7670_write_reg(0x42, 0x03); // TSLB

    /* 设置输出分辨率为 320x240 */
    ov7670_write_reg(0x3a, 0x04); // HREF
    ov7670_write_reg(0x12, 0x04); // COM7
    ov7670_write_reg(0x32, 0x80); // HSTART
    ov7670_write_reg(0x17, 0x16); // HSTOP
    ov7670_write_reg(0x18, 0x04); // VSTART
    ov7670_write_reg(0x19, 0x02); // VSTOP
    ov7670_write_reg(0x1a, 0x7b); // VREF
    ov7670_write_reg(0x03, 0x06); // VREF

    /* 设置亮度、对比度和饱和度 */
    ov7670_write_reg(0x55, 0x80); // AUTO
    ov7670_write_reg(0x56, 0x80); // AUTO
    ov7670_write_reg(0x57, 0x80); // AUTO
    ov7670_write_reg(0x58, 0x80); // AUTO
    ov7670_write_reg(0x59, 0xff); // LUMA
    ov7670_write_reg(0x5a, 0x00); // CONTRAS
    ov7670_write_reg(0x5b, 0x00); // BRIGHT
    ov7670_write_reg(0x5c, 0x00); // U_CONTRAS
    ov7670_write_reg(0x5d, 0x00); // U_BRIGHT
    ov7670_write_reg(0x5e, 0x80); // V_CONTRAS
    ov7670_write_reg(0x5f, 0x40); // V_BRIGHT

    /* 打开输出使能 */
    ov7670_write_reg(0x11, 0x01); // CLKRC
    ov7670_write_reg(0x3e, 0x00); // COM13
}

void ov7670_write_reg(uint8_t reg, uint8_t val)
{
    /* 向摄像头发送写命令和寄存器地址 */
    SCCB_Start();
    SCCB_SendByte(OV7670_ADDRESS);
    SCCB_WaitAck();
    SCCB_SendByte(reg);
    SCCB_WaitAck();

    /* 发送寄存器值 */
    SCCB_SendByte(val);
    SCCB_WaitAck();
    SCCB_Stop();
}

void ov7670_read_reg(uint8_t reg, uint8_t *val)
{
    /* 向摄像头发送写命令和寄存器地址 */
    SCCB_Start();
    SCCB_SendByte(OV7670_ADDRESS);
    SCCB_WaitAck();
    SCCB_SendByte(reg);
    SCCB_WaitAck();

    /* 发送读命令，并读取寄存器值 */
    SCCB_Stop();
    SCCB_Start();
    SCCB_SendByte(OV7670_ADDRESS | 0x01);
    SCCB_WaitAck();
    *val = SCCB_ReadByte();
    SCCB_Ack();
    SCCB_Stop();
}

下面是 OV7670 摄像头的引脚接线图：

| 摄像头引脚 | STM32F103VET6 引脚 |
| ---------- | ------------------ |
| VSYNC | PB10 |
| HREF | PB11 |
| PCLK | PB12 |
| D0 | PB13 |
| D1 | PB14 |
| D2 | PB15 |
| D3 | PC6 |
| D4 | PC7 |
| D5 | PC8 |
| D6 | PC9 |
| D7 | PC10 |
| RESET | PA8 |
| PWDN | PB1 |

需要使用 SCCB 总线来与 OV7670 摄像头进行通信，可以使用软件模拟实现。