用的是骑飞的OV2640,但是仔细的核查了SCCB协议，无法发现问题

jack_zhou · 发表于 2015-7-22 13:45:46

但是依旧读不出模块的ID：希望各位给与纠正

[mw_shl_code=c,true]#include "sccb.h" #include "Delay.h" #include "bsp_usart1.h" void I2C_GPIO(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE); //SDA?è?? GPIO_InitStructure.GPIO_Pin=I2C_SDA; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU; GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz; GPIO_Init(GPIO_I2C,&GPIO_InitStructure); //scl?è?? GPIO_InitStructure.GPIO_Pin=I2C_SCL; GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_Init(GPIO_I2C,&GPIO_InitStructure); I2C_SCL_H; I2C_SDA_H; I2C_SDA_OUT(); } void I2C_SDA_OUT(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE); GPIO_InitStructure.GPIO_Pin=I2C_SDA; GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP; GPIO_Init(GPIO_I2C,&GPIO_InitStructure); } void I2C_SDA_IN(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE); GPIO_InitStructure.GPIO_Pin=I2C_SDA; GPIO_InitStructure.GPIO_Speed=GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU; GPIO_Init(GPIO_I2C,&GPIO_InitStructure); } //?ú?ú???????? void I2C_Start(void) { I2C_SDA_H; Delay_us(100); I2C_SCL_H; Delay_us(100); I2C_SDA_L; Delay_us(100); I2C_SCL_L; Delay_us(100); } //?ú?ú???????? void I2C_Stop(void) { I2C_SDA_L; Delay_us(100); I2C_SCL_L; Delay_us(100); I2C_SCL_H; Delay_us(100); I2C_SDA_H; Delay_us(100); } //?÷?ú?ú?ú????????ACK void I2C_Ack(void) { I2C_SDA_OUT(); I2C_SDA_H; Delay_us(100); I2C_SCL_H; Delay_us(100); I2C_SCL_L; Delay_us(100); I2C_SDA_H; } //?÷?ú???ú?ú????????NACK void I2C_NAck(void) { I2C_SDA_H; Delay_us(100); I2C_SCL_H; Delay_us(100); I2C_SCL_L; Delay_us(100); I2C_SDA_L; Delay_us(100); } /****?ì?é????????********/ char TestAsk(void) { char ask; I2C_SCL_H; Delay_us(100); I2C_SDA_IN(); Delay_us(100); ask=GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_7); Delay_us(100); I2C_SCL_L; Delay_us(100); return ask; } unsigned char I2C_Send_Byte(unsigned char DData) { unsigned char j,tem; //??°??????????????? for(j=8;j>0;j--) { I2C_SCL_L; if((DData)&0x80) { I2C_SDA_H; } else { I2C_SDA_L; } DData<<=1; Delay_us(100); I2C_SCL_H; Delay_us(100); I2C_SCL_L; Delay_us(100); } Delay_us(100); I2C_SDA_IN(); Delay_us(100); I2C_SCL_H; Delay_us(100); //???????????????????é??,0±í??????????????1±í???????? if(GPIO_ReadInputDataBit(GPIO_I2C,I2C_SDA)==1) { tem=0; printf("\r\n????·????§°?\r\n"); } else { tem=1; printf("\r\n????·???????\r\n"); } I2C_SCL_L; Delay_us(100); I2C_SDA_OUT(); return(tem); } unsigned char I2C_Read_Byte(void) { unsigned char read,j; read=0x00; I2C_SDA_IN(); Delay_us(100); I2C_SCL_L; for(j=8;j>0;j--) { Delay_us(100); I2C_SCL_H; Delay_us(100); read<<=1; if(GPIO_ReadInputDataBit(GPIO_I2C,I2C_SDA)) { read |=0x01; } Delay_us(50); I2C_SCL_L; Delay_us(100); } return read; } //?????????÷???? u8 OV2640_WR_Reg(u8 reg,u8 data) { I2C_Start(); //;//????OV2640??ID if(0==I2C_Send_Byte(SCCB_ID)) { I2C_Stop(); return 0; } Delay_us(100); //;//?????è????×÷???ü?? if(0==I2C_Send_Byte(reg & 0x00ff))//?è???????????· { I2C_Stop(); return 0; } Delay_ms(100); //;//?????è?????? if(0==I2C_Send_Byte(data)) { I2C_Stop(); return 0; } I2C_Stop(); return 1; } //?????????÷???????? u8 OV2640_RD_Data(u8 reg) { u8 val; I2C_Start(); I2C_Send_Byte(SCCB_ID);//?????÷????ID Delay_us(100); I2C_Send_Byte(reg);//?????è????×÷???????÷ Delay_us(100); I2C_Stop(); Delay_us(100); I2C_Start(); I2C_Send_Byte(SCCB_ID | 0x01); Delay_us(100); val=I2C_Read_Byte(); I2C_NAck(); I2C_Stop(); return val; } [/mw_shl_code]

这里是参考原子哥的程序来读取OV2640的ID的

[mw_shl_code=c,true]u8 OV2640_ReadID(void) { u32 reg=0; I2C_GPIO(); OV2640_DataInit(); PCLK_HR_VSYNC_RST_GPIOInit(); OV2640_RST_L;//????????OV2640 Delay_ms(5); OV2640_RST_H; OV2640_WR_Reg(0xff,0x01);//??×÷sensor?????÷ if(0== OV2640_WR_Reg(0x12,0x80))//????OV2640 { printf("\r\nOV2640???????§°?\r\n"); LCD_DispEnCh(5,80,"OV2640 Init ERROR",RED); } OV2640_WR_Reg(OV2640_DSP_RA_DLMT, 0x01);//?????????·???à?????? Delay_ms(5); reg = OV2640_RD_Data(OV2640_SENSOR_MIDH); reg<<=8; reg |= OV2640_RD_Data(OV2640_SENSOR_MIDL); LCD_DispEnCh(5,100,"OV2640 ID:",RED); printf("OV2640??ID??:%d\r\n",reg); LCD_DisNum(65,100,reg,RED); if( (reg!=0)&&(reg != 0xffff) ) { printf("\r\n????OV2640??ID???·\r\n"); return 1; } else { printf("\r\n????OV2640??ID???í\r\n"); return 0; } }[/mw_shl_code]