编写stm32f103c8t6驱动OV5640的代码
时间: 2023-07-30 12:08:20 浏览: 125
驱动OV5640需要使用I2C和DMA,以下是一个简单的代码框架,可以根据具体情况进行修改和完善。假设OV5640连接到STM32F103C8T6的I2C1和DMA1。
```c
#include "stm32f10x.h"
#include "ov5640.h"
#define I2C_SPEED 100000
#define I2C_SLAVE_ADDR 0x78
#define DMA_BUFFER_SIZE 640*480*2
uint8_t dma_buffer[DMA_BUFFER_SIZE];
void OV5640_Init(void)
{
// 初始化I2C1
I2C_InitTypeDef i2c_init;
i2c_init.I2C_ClockSpeed = I2C_SPEED;
i2c_init.I2C_Mode = I2C_Mode_I2C;
i2c_init.I2C_DutyCycle = I2C_DutyCycle_2;
i2c_init.I2C_OwnAddress1 = 0;
i2c_init.I2C_Ack = I2C_Ack_Enable;
i2c_init.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_Init(I2C1, &i2c_init);
I2C_Cmd(I2C1, ENABLE);
// 初始化DMA1
DMA_InitTypeDef dma_init;
dma_init.DMA_PeripheralBaseAddr = (uint32_t)&(I2C1->DR);
dma_init.DMA_MemoryBaseAddr = (uint32_t)dma_buffer;
dma_init.DMA_DIR = DMA_DIR_PeripheralSRC;
dma_init.DMA_BufferSize = DMA_BUFFER_SIZE;
dma_init.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
dma_init.DMA_MemoryInc = DMA_MemoryInc_Enable;
dma_init.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
dma_init.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
dma_init.DMA_Mode = DMA_Mode_Normal;
dma_init.DMA_Priority = DMA_Priority_High;
dma_init.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel7, &dma_init);
// 初始化OV5640
// ...
// 触发DMA传输
I2C_DMACmd(I2C1, ENABLE);
DMA_Cmd(DMA1_Channel7, ENABLE);
}
void OV5640_ReadFrame(uint16_t* buffer)
{
while (DMA_GetFlagStatus(DMA1_FLAG_TC7) == RESET);
DMA_ClearFlag(DMA1_FLAG_TC7);
// 将DMA缓冲区中的数据转换为RGB565格式的像素数据
for (int i = 0; i < DMA_BUFFER_SIZE / 2; i++)
{
uint8_t low = dma_buffer[i * 2];
uint8_t high = dma_buffer[i * 2 + 1];
buffer[i] = (high << 8) | low;
}
}
```
需要注意的是,以上代码只是一个简单的框架,具体的OV5640驱动实现需要根据OV5640的数据手册进行编写,同时需要根据具体的应用场景来决定如何使用读取到的图像数据。