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目录
一、摄像头基础
1.1 OV2640参数
1.2 视场角与镜头
二、OV2640驱动
三、OV2640视频接入
四、OV2640 200W JPG拍照实现
五、总结
一、摄像头基础
1.1 OV2640参数
选型时我们需要关注的通用指标是焦距，视场角，拍摄分辨率等信息。另外还需根据硬件板子情况来综合考虑。一般MCU芯片不支持MIPI接口，只能并口接入视频图像，这种情况就只能选择OV2640这种并口输出的sensor。ARM芯片一般都支持MIPI接口这时可以考虑性能更高的sensor，比如OV5640，OV2710。此外还需根据嵌入式板子的硬件供电情况来综合考虑。如下是OV2710的通用技术指标：
1.2 视场角与镜头
二、OV2640驱动
如下只是实例代码，完整代码请点此处下载
#include "fsl_ov2640.h"
#include "ov2640cfg.h"
#include "ov2640_jpeg.h"
#include "fsl_common.h"
#include "board.h"/******************************************************************************** Definitions******************************************************************************/
#define OV2640_SCCB_ADDR (0x60>>1)
#define OV2640_REVISION 0x2642Ustatus_t OV2640_WriteReg(uint8_t reg, uint8_t val)
{uint8_t i = 0;status_t WriteStatus = 0;for( i = 0 ;i < 3; i++ ){WriteStatus = BOARD_Camera_I2C_SendSCCB(OV2640_SCCB_ADDR, reg, kSCCB_RegAddr8Bit, &val, 1);if( WriteStatus == kStatus_Success)break;elsert_kprintf("WriteStatus = %d\r\n",WriteStatus);}return WriteStatus;
} status_t OV2640_ReadReg(uint8_t reg, uint8_t *val)
{return BOARD_Camera_I2C_ReceiveSCCB(OV2640_SCCB_ADDR, reg, kSCCB_RegAddr8Bit, val, 1);
} typedef struct _ov2640_reg
{uint8_t reg;uint8_t val;
} ov2640_reg_t;/******************************************************************************** Prototypes******************************************************************************///OV2640切换为JPEG模式
void OV2640_JPEG_Mode( void);
//OV2640切换为RGB565模式
void OV2640_RGB565_Mode( void);
void OV2640_RegSet( uint8_t mode);
/******************************************************************************** Variables******************************************************************************/
static const ov2640_reg_t ov2640_RA_DLMT_Regs[] = {{OV2640_DSP_RA_DLMT, 0x01},{OV2640_COM7_REG, 0x80}
};/******************************************************************************** Code******************************************************************************/
static void OV2640_DelayMs(uint32_t ms)
{VIDEO_DelayMs(ms);
}static status_t OV2640_WriteRegs(const ov2640_reg_t regs[], uint32_t num)
{status_t status = kStatus_Success;for (uint32_t i = 0; i < num; i++){status = OV2640_WriteReg(regs[i].reg, regs[i].val);if (kStatus_Success != status){break;}}return status;
}static status_t OV2640_SoftwareReset(void)
{return OV2640_WriteReg(OV2640_COM7_REG, 0x80);
}void ov2640_jpg_rgb565_set(void);
void ov2640_jpg_photo_set(void);status_t OV2640_Reg_Init(uint8_t mode)//0--rgb565 1--photo
{status_t status;uint8_t pid = 0U, ver = 0U;status = OV2640_WriteRegs(ov2640_RA_DLMT_Regs, ARRAY_SIZE(ov2640_RA_DLMT_Regs));if (kStatus_Success != status){return status;}/* Identify the device. */status = OV2640_ReadReg(OV2640_PID_REG, &pid);//0x0Aif (kStatus_Success != status){return status;}status = OV2640_ReadReg(OV2640_VER_REG, &ver);//0x0BUif (kStatus_Success != status){return status;}if (OV2640_REVISION != (((uint32_t)pid << 8U) | (uint32_t)ver)){return kStatus_Fail;}rt_kprintf("----camera id read ok %d %d\n", ver,rt_tick_get());rt_kprintf("----camera id read : 0x%x %d\n", (((uint32_t)pid << 8U) | (uint32_t)ver),rt_tick_get());OV2640_RegSet(mode);//0--rgb565 1--photort_kprintf("----OV2640_Reg_Init ok %d\r\n",rt_tick_get());return 0;
}void OV2640_svga_15fps(void)
{OV2640_WriteReg( 0XFF,0X01);OV2640_WriteReg( 0X11,0X01);OV2640_WriteReg(0x12, 0x40);OV2640_Wr