ov2640与stm32的通讯
时间: 2023-07-30 09:04:34 浏览: 52
OV2640是一款图像传感器,可通过串行总线与STM32进行通信。常见的串行总线包括SPI和I2C。以下是使用SPI通信的示例:
1. 首先需要初始化SPI接口,例如:
```c
SPI_HandleTypeDef hspi;
void MX_SPI1_Init(void)
{
/* SPI1 parameter configuration*/
hspi.Instance = SPI1;
hspi.Init.Mode = SPI_MODE_MASTER;
hspi.Init.Direction = SPI_DIRECTION_2LINES;
hspi.Init.DataSize = SPI_DATASIZE_8BIT;
hspi.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi.Init.NSS = SPI_NSS_SOFT;
hspi.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256;
hspi.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi.Init.TIMode = SPI_TIMODE_DISABLE;
hspi.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi.Init.CRCPolynomial = 10;
if (HAL_SPI_Init(&hspi) != HAL_OK)
{
Error_Handler();
}
}
```
2. 配置OV2640的寄存器,例如读取设备ID:
```c
uint8_t ov2640_read_id(void)
{
uint8_t id = 0;
uint8_t tx_data[2] = {0x00, 0x0a}; //0x0a是OV2640设备ID寄存器地址
uint8_t rx_data[2] = {0, 0};
HAL_GPIO_WritePin(CAMERA_CS_GPIO_Port, CAMERA_CS_Pin, GPIO_PIN_RESET);
HAL_SPI_TransmitReceive(&hspi, tx_data, rx_data, 2, 1000);
HAL_GPIO_WritePin(CAMERA_CS_GPIO_Port, CAMERA_CS_Pin, GPIO_PIN_SET);
id = rx_data[1];
return id;
}
```
3. 读取图像数据,例如:
```c
uint8_t ov2640_read_data(uint8_t *data, uint32_t len)
{
uint8_t tx_data[2] = {0x00, 0x3c}; //0x3c是OV2640图像数据寄存器地址
uint8_t rx_data[2] = {0, 0};
HAL_GPIO_WritePin(CAMERA_CS_GPIO_Port, CAMERA_CS_Pin, GPIO_PIN_RESET);
HAL_SPI_Transmit(&hspi, tx_data, 2, 1000);
HAL_SPI_Receive(&hspi, data, len, 1000);
HAL_GPIO_WritePin(CAMERA_CS_GPIO_Port, CAMERA_CS_Pin, GPIO_PIN_SET);
return 0;
}
```
以上仅为简单示例,具体实现需要根据OV2640的数据手册和STM32的SPI驱动库进行调整。
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