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针对静止拍摄图像场景,实现STM32H750对30万像素OV7670摄像头进行图像捕获,并通过串口将数据送到上位机软件进行解码。
本文可作为STM32H7及STM32F7系列驱动OV7670摄像头的代码参考,通过DCMI的CROP功能,使用者可以从OV7670最大输出分辨率(640×480)中“剪”出更小分辨率图片。
对于需要STM32H750输出24MHz时钟给OV7670摄像头模块的场景,可以用STM32 MCO功能输出24MHz时钟。如果摄像头模块自带晶振,不需要STM32提供时钟。
USB虚拟串口:
USART1串口配置:
DCMI接口:
STM32H7的HAL库DCMI接口,从1.8版本升级1.9以上版本后,配置及函数存在问题。因此这里的参数配置(“Parameter Settings”)部分,会在程序里面重新配置。
而其它部分正常配置:
需要单独对DCMI接口的HSYNC和VSYNC做输入GPIO的配置:
OV7670的SCCB接口时序通过STM32的GPIO管脚模拟,不采用专用的IIC管脚。OV7670的Reset和PowerDown信号,也通过2个GPIO进行管理控制。
保存,并生成初始代码,再进行功能代码的编写。
编写ov7670.h文件:
#include "stm32h7xx_hal.h" #ifndef _OV7670_H #define _OV7670_H //for not open-drain bus /* * SIOC: PE7 * SIOD: PE8 * VSYNC: PB7 * HREF: PA4 * PCLK: PA6 * XCLK: PA8 //24MHz, optional to use * D7: PB9 * D6: PB8 * D5: PD3 * D4: PC11 * D3: PE1 * D2: PC8 * D1: PC7 * D0: PC6 * RESET: PD10 * PWDN: PD11 * * */ #define SCCB_SCL_L HAL_GPIO_WritePin(GPIOE,GPIO_PIN_7,GPIO_PIN_RESET) #define SCCB_SCL_H HAL_GPIO_WritePin(GPIOE,GPIO_PIN_7,GPIO_PIN_SET) #define SCCB_SDA_L HAL_GPIO_WritePin(GPIOE,GPIO_PIN_8,GPIO_PIN_RESET) #define SCCB_SDA_H HAL_GPIO_WritePin(GPIOE,GPIO_PIN_8,GPIO_PIN_SET) #define SCCB_READ_SDA HAL_GPIO_ReadPin(GPIOE, GPIO_PIN_8) #define SCCB_ID_W 0X42 //OV7670 ID for Write #define SCCB_ID_R 0X43 //OV7670 ID for Read #define OV7670_PWDN HAL_GPIO_WritePin(GPIOD,GPIO_PIN_11,GPIO_PIN_SET) #define OV7670_PWUP HAL_GPIO_WritePin(GPIOD,GPIO_PIN_11,GPIO_PIN_RESET) #define OV7670_RST HAL_GPIO_WritePin(GPIOD,GPIO_PIN_10,GPIO_PIN_RESET) #define OV7670_RUN HAL_GPIO_WritePin(GPIOD,GPIO_PIN_10,GPIO_PIN_SET) #define OV7670_VSYNC HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_7) #define OV7670_HREF HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_4) #define OV7670_PCLK HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_6) void SCCB_Start(void); void SCCB_Stop(void); void SCCB_No_Ack(void); uint8_t SCCB_WR_Byte(uint8_t data); uint8_t SCCB_RD_Byte(void); uint8_t SCCB_WR_Reg(uint8_t reg,uint8_t data); uint8_t SCCB_RD_Reg(uint8_t reg); uint32_t tickdelay; void SCCB_SDA_IN(void); void SCCB_SDA_OUT(void); #define ticknumber 12*10 void SCCB_Rst(void); /***********************************/ void OV7670_640_480_RGB565_Init(void); void OV7670_Light_Mode(uint8_t mode); void OV7670_Color_Saturation(uint8_t sat); void OV7670_Brightness(uint8_t bright); void OV7670_Contrast(uint8_t contrast); void OV7670_Special_Effects(uint8_t eft); #endif
编写ov7670.c文件:
#include <ov7670.h> //for not open-drain bus void SCCB_Start(void) { SCCB_SDA_H; SCCB_SCL_H; tickdelay = ticknumber;while(tickdelay--); SCCB_SDA_L; tickdelay = ticknumber;while(tickdelay--); SCCB_SCL_L; } void SCCB_Stop(void) { SCCB_SDA_L; tickdelay = ticknumber;while(tickdelay--); SCCB_SCL_H; tickdelay = ticknumber;while(tickdelay--); SCCB_SDA_H; tickdelay = ticknumber;while(tickdelay--); } void SCCB_No_Ack(void) { HAL_Delay(1); SCCB_SDA_H; SCCB_SCL_H; tickdelay = ticknumber;while(tickdelay--); SCCB_SCL_L; tickdelay = ticknumber;while(tickdelay--); SCCB_SDA_L; tickdelay = ticknumber;while(tickdelay--); } uint8_t SCCB_WR_Byte(uint8_t dat) { uint8_t j,res; for(j=0;j<8;j++) { if(dat&0x80)SCCB_SDA_H; else SCCB_SDA_L; dat<<=1; tickdelay = ticknumber;while(tickdelay--); SCCB_SCL_H; tickdelay = ticknumber;while(tickdelay--); SCCB_SCL_L; } SCCB_SDA_IN(); tickdelay = ticknumber;while(tickdelay--); SCCB_SCL_H; tickdelay = ticknumber;while(tickdelay--); if(SCCB_READ_SDA)res=1; else res=0; SCCB_SCL_L; SCCB_SDA_OUT(); return res; } uint8_t SCCB_RD_Byte(void) { uint8_t temp=0,j; SCCB_SDA_IN(); for(j=8;j>0;j--) { tickdelay = ticknumber;while(tickdelay--); SCCB_SCL_H; temp=temp<<1; if(SCCB_READ_SDA)temp++; tickdelay = ticknumber;while(tickdelay--); SCCB_SCL_L; } SCCB_SDA_OUT(); return temp; } uint8_t SCCB_WR_Reg(uint8_t reg,uint8_t data) { uint8_t res=0; SCCB_Start(); if(SCCB_WR_Byte(SCCB_ID_W))res=1; tickdelay = ticknumber;while(tickdelay--); if(SCCB_WR_Byte(reg))res=1; tickdelay = ticknumber;while(tickdelay--); if(SCCB_WR_Byte(data))res=1; SCCB_Stop(); return res; } uint8_t SCCB_RD_Reg(uint8_t reg) { uint8_t val=0; SCCB_Start(); SCCB_WR_Byte(SCCB_ID_W); tickdelay = ticknumber;while(tickdelay--); SCCB_WR_Byte(reg); tickdelay = ticknumber;while(tickdelay--); SCCB_Stop(); tickdelay = ticknumber;while(tickdelay--); SCCB_Start(); SCCB_WR_Byte(SCCB_ID_R); tickdelay = ticknumber;while(tickdelay--); val=SCCB_RD_Byte(); SCCB_No_Ack(); SCCB_Stop(); return val; } void SCCB_SDA_IN(void) { GPIO_InitTypeDef GPIO_InitStruct = {0}; __HAL_RCC_GPIOE_CLK_ENABLE(); GPIO_InitStruct.Pin = GPIO_PIN_8; GPIO_InitStruct.Mode = GPIO_MODE_INPUT; GPIO_InitStruct.Pull = GPIO_PULLUP; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH; HAL_GPIO_Init(GPIOE, &GPIO_InitStruct); } void SCCB_SDA_OUT(void) { GPIO_InitTypeDef GPIO_InitStruct = {0}; __HAL_RCC_GPIOE_CLK_ENABLE(); GPIO_InitStruct.Pin = GPIO_PIN_8; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH; HAL_GPIO_Init(GPIOE, &GPIO_InitStruct); } void SCCB_Rst(void) { HAL_GPIO_WritePin(GPIOD,GPIO_PIN_11,GPIO_PIN_RESET) ; HAL_GPIO_WritePin(GPIOD,GPIO_PIN_10,GPIO_PIN_RESET) ; HAL_Delay(5); HAL_GPIO_WritePin(GPIOD,GPIO_PIN_10,GPIO_PIN_SET) ; HAL_Delay(5); } //--------------OV7670 Functions--------------// void OV7670_640_480_RGB565_Init(void) { SCCB_WR_Reg(0x11, 0x02); // 30fps SCCB_WR_Reg(0x6b, 0x8a); // pclk*6 SCCB_WR_Reg(0x3A, 0x04); SCCB_WR_Reg(0x12, 0x04); //RGB SCCB_WR_Reg(0x17, 0x13); SCCB_WR_Reg(0x18, 0x01); SCCB_WR_Reg(0x32, 0xB6); SCCB_WR_Reg(0x19, 0x02); SCCB_WR_Reg(0x1A, 0x7A); SCCB_WR_Reg(0x03, 0x0F); SCCB_WR_Reg(0x0C, 0x00); SCCB_WR_Reg(0x3E, 0x00); SCCB_WR_Reg(0x70, 0x3A); SCCB_WR_Reg(0x71, 0x35); SCCB_WR_Reg(0x72, 0x11); SCCB_WR_Reg(0x73, 0xF0); SCCB_WR_Reg(0xA2, 0x3B); SCCB_WR_Reg(0x1E, 0x0F); SCCB_WR_Reg(0x7a, 0x20); SCCB_WR_Reg(0x7b, 0x03); SCCB_WR_Reg(0x7c, 0x0a); SCCB_WR_Reg(0x7d, 0x1a); SCCB_WR_Reg(0x7e, 0x3f); SCCB_WR_Reg(0x7f, 0x4e); SCCB_WR_Reg(0x80, 0x5b); SCCB_WR_Reg(0x81, 0x68); SCCB_WR_Reg(0x82, 0x75); SCCB_WR_Reg(0x83, 0x7f); SCCB_WR_Reg(0x84, 0x89); SCCB_WR_Reg(0x85, 0x9a); SCCB_WR_Reg(0x86, 0xa6); SCCB_WR_Reg(0x87, 0xbd); SCCB_WR_Reg(0x88, 0xd3); SCCB_WR_Reg(0x89, 0xe8); SCCB_WR_Reg(0x13, 0xE0); SCCB_WR_Reg(0x00, 0x00); SCCB_WR_Reg(0x10, 0x00); SCCB_WR_Reg(0x0D, 0x50); SCCB_WR_Reg(0x42, 0x40); SCCB_WR_Reg(0x14, 0x28); SCCB_WR_Reg(0xA5, 0x03); SCCB_WR_Reg(0xAB, 0x03); SCCB_WR_Reg(0x24, 0x50); SCCB_WR_Reg(0x25, 0x43); SCCB_WR_Reg(0x26, 0xa3); SCCB_WR_Reg(0x9F, 0x78); SCCB_WR_Reg(0xA0, 0x68); SCCB_WR_Reg(0xA1, 0x03); SCCB_WR_Reg(0xA6, 0xd2); SCCB_WR_Reg(0xA7, 0xd2); SCCB_WR_Reg(0xA8, 0xF0); SCCB_WR_Reg(0xA9, 0x80); SCCB_WR_Reg(0xAA, 0x14); SCCB_WR_Reg(0x13, 0xE5); SCCB_WR_Reg(0x0E, 0x61); SCCB_WR_Reg(0x0F, 0x4B); // Flip (bit4) & Mirror (bit5) SCCB_WR_Reg(0x16, 0x02); SCCB_WR_Reg(0x21, 0x02); SCCB_WR_Reg(0x22, 0x91); SCCB_WR_Reg(0x29, 0x07); SCCB_WR_Reg(0x33, 0x0B); SCCB_WR_Reg(0x35, 0x0B); SCCB_WR_Reg(0x37, 0x1D); SCCB_WR_Reg(0x38, 0x71); SCCB_WR_Reg(0x39, 0x2A); SCCB_WR_Reg(0x3C, 0x78); SCCB_WR_Reg(0x4D, 0x40); SCCB_WR_Reg(0x4E, 0x20); SCCB_WR_Reg(0x69, 0x00); SCCB_WR_Reg(0x74, 0x10); SCCB_WR_Reg(0x8D, 0x4F); SCCB_WR_Reg(0x8E, 0x00); SCCB_WR_Reg(0x8F, 0x00); SCCB_WR_Reg(0x90, 0x00); SCCB_WR_Reg(0x91, 0x00); SCCB_WR_Reg(0x96, 0x00); SCCB_WR_Reg(0x9A, 0x80); SCCB_WR_Reg(0xB0, 0x84); SCCB_WR_Reg(0xB1, 0x0C); SCCB_WR_Reg(0xB2, 0x0E); SCCB_WR_Reg(0xB3, 0x82); SCCB_WR_Reg(0xB8, 0x0A); SCCB_WR_Reg(0x43, 0x02); SCCB_WR_Reg(0x44, 0xf2); SCCB_WR_Reg(0x45, 0x46); SCCB_WR_Reg(0x46, 0x63); SCCB_WR_Reg(0x47, 0x32); SCCB_WR_Reg(0x48, 0x3b); SCCB_WR_Reg(0x59, 0x92); SCCB_WR_Reg(0x5a, 0x9b); SCCB_WR_Reg(0x5b, 0xa5); SCCB_WR_Reg(0x5c, 0x7a); SCCB_WR_Reg(0x5d, 0x4a); SCCB_WR_Reg(0x5e, 0x0a); SCCB_WR_Reg(0x6c, 0x0a); SCCB_WR_Reg(0x6d, 0x55); SCCB_WR_Reg(0x6e, 0x11); SCCB_WR_Reg(0x6f, 0x9e); SCCB_WR_Reg(0x6A, 0x40); SCCB_WR_Reg(0x01, 0x40); SCCB_WR_Reg(0x02, 0x40); SCCB_WR_Reg(0x13, 0xf7); SCCB_WR_Reg(0x4f, 0x9c); SCCB_WR_Reg(0x50, 0x99); SCCB_WR_Reg(0x51, 0x02); SCCB_WR_Reg(0x52, 0x29); SCCB_WR_Reg(0x53, 0x8b); SCCB_WR_Reg(0x54, 0xb5); SCCB_WR_Reg(0x58, 0x1e); SCCB_WR_Reg(0x62, 0x08); SCCB_WR_Reg(0x63, 0x10); SCCB_WR_Reg(0x64, 0x04); SCCB_WR_Reg(0x65, 0x00); SCCB_WR_Reg(0x66, 0x05); SCCB_WR_Reg(0x94, 0x04); SCCB_WR_Reg(0x95, 0x06); SCCB_WR_Reg(0x41, 0x08); SCCB_WR_Reg(0x3F, 0x00); SCCB_WR_Reg(0x75, 0x44); SCCB_WR_Reg(0x76, 0xe1); SCCB_WR_Reg(0x4C, 0x00); SCCB_WR_Reg(0x77, 0x01); SCCB_WR_Reg(0x3D, 0xC0); SCCB_WR_Reg(0x4B, 0x09); SCCB_WR_Reg(0xC9, 0x60); SCCB_WR_Reg(0x41, 0x38); SCCB_WR_Reg(0x56, 0x40); SCCB_WR_Reg(0x34, 0x11); SCCB_WR_Reg(0x3b, 0x02); SCCB_WR_Reg(0xa4, 0x88); //disable night mode SCCB_WR_Reg(0x92, 0x00); SCCB_WR_Reg(0x96, 0x00); SCCB_WR_Reg(0x97, 0x30); SCCB_WR_Reg(0x98, 0x20); SCCB_WR_Reg(0x99, 0x20); SCCB_WR_Reg(0x9A, 0x84); SCCB_WR_Reg(0x9B, 0x29); SCCB_WR_Reg(0x9C, 0x03); SCCB_WR_Reg(0x9D, 0x99); SCCB_WR_Reg(0x9E, 0x7F); SCCB_WR_Reg(0x78, 0x00); SCCB_WR_Reg(0x79, 0x01); SCCB_WR_Reg(0xc8, 0xf0); SCCB_WR_Reg(0x79, 0x0f); SCCB_WR_Reg(0xc8, 0x00); SCCB_WR_Reg(0x79, 0x10); SCCB_WR_Reg(0xc8, 0x7e); SCCB_WR_Reg(0x79, 0x0a); SCCB_WR_Reg(0xc8, 0x80); SCCB_WR_Reg(0x79, 0x0b); SCCB_WR_Reg(0xc8, 0x01); SCCB_WR_Reg(0x79, 0x0c); SCCB_WR_Reg(0xc8, 0x0f); SCCB_WR_Reg(0x79, 0x0d); SCCB_WR_Reg(0xc8, 0x20); SCCB_WR_Reg(0x79, 0x09); SCCB_WR_Reg(0xc8, 0x80); SCCB_WR_Reg(0x79, 0x02); SCCB_WR_Reg(0xc8, 0xc0); SCCB_WR_Reg(0x79, 0x03); SCCB_WR_Reg(0xc8, 0x40); SCCB_WR_Reg(0x79, 0x05); SCCB_WR_Reg(0xc8, 0x30); SCCB_WR_Reg(0x79, 0x26); SCCB_WR_Reg(0x3b, 0x02); SCCB_WR_Reg(0x43, 0x02); SCCB_WR_Reg(0x44, 0xf2); SCCB_WR_Reg(0x30, 0x4F); SCCB_WR_Reg(0x09, 0x00); SCCB_WR_Reg(0x15, 0x00); SCCB_WR_Reg(0x40, 0xd0); SCCB_WR_Reg(0x8c, 0x00); } void OV7670_config_window(uint16_t startx,uint16_t starty,uint16_t width, uint16_t height) { uint16_t endx=(startx+width*2)%784; uint16_t endy=(starty+height*2); uint16_t x_reg, y_reg; uint16_t temp; SCCB_WR_Reg(0x12, 0x14); x_reg = SCCB_RD_Reg(0x32); x_reg &= 0xC0; y_reg = SCCB_RD_Reg(0x03); y_reg &= 0xF0; temp = x_reg|((endx&0x7)<<3)|(startx&0x7); SCCB_WR_Reg(0x32, temp ); temp = (startx&0x7F8)>>3; SCCB_WR_Reg(0x17, temp ); temp = (endx&0x7F8)>>3; SCCB_WR_Reg(0x18, temp ); temp = y_reg|((endy&0x3)<<2)|(starty&0x3); SCCB_WR_Reg(0x03, temp ); temp = (starty&0x3FC)>>2; SCCB_WR_Reg(0x19, temp ); temp = (endy&0x3FC)>>2; SCCB_WR_Reg(0x1A, temp ); } //Light_Mode //0:auto //1:sunny //2,cloudy //3,office //4,home void OV7670_Light_Mode(uint8_t mode) { uint8_t reg13val=0XE7; uint8_t reg01val=0; uint8_t reg02val=0; switch(mode) { case 1://sunny reg13val=0XE5; reg01val=0X5A; reg02val=0X5C; break; case 2://cloudy reg13val=0XE5; reg01val=0X58; reg02val=0X60; break; case 3://office reg13val=0XE5; reg01val=0X84; reg02val=0X4c; break; case 4://home reg13val=0XE5; reg01val=0X96; reg02val=0X40; break; } SCCB_WR_Reg(0X13,reg13val); SCCB_WR_Reg(0X01,reg01val); SCCB_WR_Reg(0X02,reg02val); } //Color_Saturation //0:-2 //1:-1 //2,0 //3,1 //4,2 void OV7670_Color_Saturation(uint8_t sat) { uint8_t reg4f5054val=0X80; uint8_t reg52val=0X22; uint8_t reg53val=0X5E; switch(sat) { case 0://-2 reg4f5054val=0X40; reg52val=0X11; reg53val=0X2F; break; case 1://-1 reg4f5054val=0X66; reg52val=0X1B; reg53val=0X4B; break; case 3://1 reg4f5054val=0X99; reg52val=0X28; reg53val=0X71; break; case 4://2 reg4f5054val=0XC0; reg52val=0X33; reg53val=0X8D; break; } SCCB_WR_Reg(0X4F,reg4f5054val); SCCB_WR_Reg(0X50,reg4f5054val); SCCB_WR_Reg(0X51,0X00); SCCB_WR_Reg(0X52,reg52val); SCCB_WR_Reg(0X53,reg53val); SCCB_WR_Reg(0X54,reg4f5054val); SCCB_WR_Reg(0X58,0X9E); } //Brightness //0:-2 //1:-1 //2,0 //3,1 //4,2 void OV7670_Brightness(uint8_t bright) { uint8_t reg55val=0X00; switch(bright) { case 0://-2 reg55val=0XB0; break; case 1://-1 reg55val=0X98; break; case 3://1 reg55val=0X18; break; case 4://2 reg55val=0X30; break; } SCCB_WR_Reg(0X55,reg55val); } //Contrast //0:-2 //1:-1 //2,0 //3,1 //4,2 void OV7670_Contrast(uint8_t contrast) { uint8_t reg56val=0X40; switch(contrast) { case 0://-2 reg56val=0X30; break; case 1://-1 reg56val=0X38; break; case 3://1 reg56val=0X50; break; case 4://2 reg56val=0X60; break; } SCCB_WR_Reg(0X56,reg56val); } //Special_Effects //0:normal //1,negative //2,black-white //3,red //4,green //5,blue //6,classic void OV7670_Special_Effects(uint8_t eft) { uint8_t reg3aval=0X04; uint8_t reg67val=0XC0; uint8_t reg68val=0X80; switch(eft) { case 1: reg3aval=0X24; reg67val=0X80; reg68val=0X80; break; case 2: reg3aval=0X14; reg67val=0X80; reg68val=0X80; break; case 3: reg3aval=0X14; reg67val=0Xc0; reg68val=0X80; break; case 4: reg3aval=0X14; reg67val=0X40; reg68val=0X40; break; case 5: reg3aval=0X14; reg67val=0X80; reg68val=0XC0; break; case 6: reg3aval=0X14; reg67val=0XA0; reg68val=0X40; break; } SCCB_WR_Reg(0X3A,reg3aval); SCCB_WR_Reg(0X68,reg67val); SCCB_WR_Reg(0X67,reg68val); }
以上代码实现对OV7670的接口访问, 实现OV7670初始化(配置为640×80 RGB模式),并持续向外输出图像。
STM32通过串口接收指令,程序里设计一个标识变量scmd用于指示接收到的指令。需要在USB虚拟串口的接收函数里进行处理:
static int8_t CDC_Receive_FS(uint8_t* Buf, uint32_t *Len)
{
/* USER CODE BEGIN 6 */
extern uint8_t scmd;
if(Buf[0]==0x01) scmd=0x01;
USBD_CDC_SetRxBuffer(&hUsbDeviceFS, &Buf[0]);
USBD_CDC_ReceivePacket(&hUsbDeviceFS);
return (USBD_OK);
/* USER CODE END 6 */
}
以及在USART1的接收中断里进行处理:
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) { if (huart == &huart1) { if (aRxBuffer==0x01) { scmd = 0x02; aRxBuffer=0x00; HAL_UART_Receive_IT(&huart1, (uint8_t *)&aRxBuffer, 1); } else { HAL_UART_Receive_IT(&huart1, (uint8_t *)&aRxBuffer, 1); } } return; }
STM32向上位机发送图像数据采用USB虚拟串口或串口DMA方式,程序里设计一个标识变量tx_busy,在当前DMA发送完后指示状态:
static int8_t CDC_TransmitCplt_FS(uint8_t *Buf, uint32_t *Len, uint8_t epnum)
{
uint8_t result = USBD_OK;
/* USER CODE BEGIN 13 */
extern uint8_t tx_busy ;
tx_busy = 0;
UNUSED(Buf);
UNUSED(Len);
UNUSED(epnum);
/* USER CODE END 13 */
return result;
}
同样,对USART1的DMA发送完处理:
void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart)
{
extern uint8_t tx_busy;
if (huart == &huart1)
{
tx_busy = 0;
}
}
初始化DCMI DMA配置时,如将接收地址设置为不自增方式。后续的图像捕获需要工作在DMA接收地址自增方式,因此单独设计两个函数可用于切换。
void DCMI_DMA_MemInc_En(void) { HAL_DMA_DeInit(&hdma_dcmi); hdma_dcmi.Init.MemInc = DMA_MINC_ENABLE; if (HAL_DMA_Init(&hdma_dcmi) != HAL_OK) { Error_Handler(); } } void DCMI_DMA_MemInc_Den(void) { HAL_DMA_DeInit(&hdma_dcmi); hdma_dcmi.Init.MemInc = DMA_MINC_DISABLE; if (HAL_DMA_Init(&hdma_dcmi) != HAL_OK) { Error_Handler(); } }
按照1.8版本HAL库,设计DCMI的初始化修正函数:
void PY_DCMI_Full_Init(void) { hdcmi.Instance = DCMI; hdcmi.Init.SynchroMode = DCMI_SYNCHRO_HARDWARE; hdcmi.Init.PCKPolarity = DCMI_PCKPOLARITY_RISING; hdcmi.Init.VSPolarity = DCMI_VSPOLARITY_HIGH; hdcmi.Init.HSPolarity = DCMI_HSPOLARITY_LOW; hdcmi.Init.CaptureRate = DCMI_CR_ALL_FRAME; hdcmi.Init.ExtendedDataMode = DCMI_EXTEND_DATA_8B; hdcmi.Init.JPEGMode = DCMI_JPEG_DISABLE; hdcmi.Init.ByteSelectMode = DCMI_BSM_ALL; hdcmi.Init.ByteSelectStart = DCMI_OEBS_ODD; hdcmi.Init.LineSelectMode = DCMI_LSM_ALL; hdcmi.Init.LineSelectStart = DCMI_OELS_ODD; if (HAL_DCMI_Init(&hdcmi) != HAL_OK) { Error_Handler(); } }
在程序跑起来后,会先对OV7670接口进行典型寄存器读取并USART1串口输出,用于识别接口时序是否正常。然后进入命令等待,接收到指令后,再从OV7670输出的图像中截取数据串口DMA输出。
/* USER CODE BEGIN Header */ /** ****************************************************************************** * @file : main.c * @brief : Main program body ****************************************************************************** * @attention * * <h2><center>© Copyright (c) 2021 STMicroelectronics. * All rights reserved.</center></h2> * * This software component is licensed by ST under BSD 3-Clause license, * the "License"; You may not use this file except in compliance with the * License. You may obtain a copy of the License at: * opensource.org/licenses/BSD-3-Clause * ****************************************************************************** */ /* USER CODE END Header */ /* Includes ------------------------------------------------------------------*/ #include "main.h" #include "usb_device.h" /* Private includes ----------------------------------------------------------*/ /* USER CODE BEGIN Includes */ #include <string.h> #include "ov7670.h" /* USER CODE END Includes */ /* Private typedef -----------------------------------------------------------*/ /* USER CODE BEGIN PTD */ void DCMI_DMA_MemInc_En(void); void DCMI_DMA_MemInc_Den(void); void PY_DCMI_Full_Init(void); /* USER CODE END PTD */ /* Private define ------------------------------------------------------------*/ /* USER CODE BEGIN PD */ uint8_t aRxBuffer=0; uint8_t TxBuff[99] = {0}; uint8_t StatusFlag = 0; uint8_t OV7670_verh = 0xff, OV7670_verl=0xff; HAL_StatusTypeDef dcmi_dma_status = HAL_OK; uint32_t* dcmi_data_buff; uint32_t DCMI_RN = 0; //row number uint32_t DCMI_CN = 0; //column number uint32_t DCMI_RS = 0; //row start uint32_t DCMI_CS = 0; //column start uint8_t scmd = 0; uint8_t tx_busy = 0; /* USER CODE END PD */ /* Private macro -------------------------------------------------------------*/ /* USER CODE BEGIN PM */ /* USER CODE END PM */ /* Private variables ---------------------------------------------------------*/ DCMI_HandleTypeDef hdcmi; DMA_HandleTypeDef hdma_dcmi; UART_HandleTypeDef huart1; DMA_HandleTypeDef hdma_usart1_tx; /* USER CODE BEGIN PV */ /* USER CODE END PV */ /* Private function prototypes -----------------------------------------------*/ void SystemClock_Config(void); static void MX_GPIO_Init(void); static void MX_DMA_Init(void); static void MX_DCMI_Init(void); static void MX_USART1_UART_Init(void); /* USER CODE BEGIN PFP */ /* USER CODE END PFP */ /* Private user code ---------------------------------------------------------*/ /* USER CODE BEGIN 0 */ /* USER CODE END 0 */ /** * @brief The application entry point. * @retval int */ int main(void) { /* USER CODE BEGIN 1 */ dcmi_data_buff = 0x30000000; /* USER CODE END 1 */ /* MCU Configuration--------------------------------------------------------*/ /* Reset of all peripherals, Initializes the Flash interface and the Systick. */ HAL_Init(); /* USER CODE BEGIN Init */ /* USER CODE END Init */ /* Configure the system clock */ SystemClock_Config(); /* USER CODE BEGIN SysInit */ /* USER CODE END SysInit */ /* Initialize all configured peripherals */ MX_GPIO_Init(); MX_DMA_Init(); MX_USB_DEVICE_Init(); MX_DCMI_Init(); MX_USART1_UART_Init(); /* USER CODE BEGIN 2 */ if (HAL_UART_Receive_IT(&huart1, (uint8_t *)&aRxBuffer, 1)!=HAL_OK) { MX_USART1_UART_Init(); HAL_UART_Receive_IT(&huart1, (uint8_t *)&aRxBuffer, 1); } SCCB_Rst(); OV7670_verh = SCCB_RD_Reg(0x0a); OV7670_verl = SCCB_RD_Reg(0x0b); HAL_UART_Transmit(&huart1, &OV7670_verh, 1, 0xFFFFFF); HAL_Delay(50); HAL_UART_Transmit(&huart1, &OV7670_verl, 1, 0xFFFFFF); HAL_Delay(50); OV7670_640_480_RGB565_Init(); OV7670_Light_Mode(0); OV7670_Color_Saturation(2); OV7670_Brightness(2); OV7670_Contrast(2); HAL_Delay(200); HAL_DCMI_DeInit(&hdcmi); PY_DCMI_Full_Init(); /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { HAL_Delay(1); if (scmd==1) { scmd = 0; TxBuff[0]=0x55;TxBuff[1]=0xaa; TxBuff[2]=0x01; //OV7670 label tx_busy = 1; CDC_Transmit_FS(TxBuff, 3); while(tx_busy==1) HAL_Delay(1); dcmi_dma_status = HAL_DCMI_Init(&hdcmi); for (uint8_t i=0; i<10;i++) { HAL_DCMI_DisableCrop (&hdcmi); DCMI_RN = 48; DCMI_CN = 1280; DCMI_RS = 48*i; DCMI_CS = 0; HAL_DCMI_ConfigCrop (&hdcmi, DCMI_CS, DCMI_RS, DCMI_CN, DCMI_RN); HAL_Delay(1); HAL_DCMI_EnableCrop (&hdcmi); HAL_Delay(1); dcmi_dma_status = HAL_DCMI_Start_DMA(&hdcmi, DCMI_MODE_SNAPSHOT, dcmi_data_buff, DCMI_CN*DCMI_RN/4); while(HAL_DMA_GetState(&hdcmi)==HAL_DMA_STATE_BUSY) ; HAL_DCMI_Stop(&hdcmi); tx_busy = 1; CDC_Transmit_FS((uint8_t *)dcmi_data_buff, 61440); while(tx_busy!=0) ; } } if (scmd==2) { scmd = 0; DCMI_DMA_MemInc_En(); TxBuff[0]=0x55;TxBuff[1]=0xaa; TxBuff[2]=0x01; //OV7670 label HAL_UART_Transmit(&huart1, TxBuff, 3, 0xFFFFFF); HAL_Delay(100); dcmi_dma_status = HAL_DCMI_Init(&hdcmi); for (uint8_t i=0; i<10;i++) { HAL_DCMI_DisableCrop (&hdcmi); DCMI_RN = 48; DCMI_CN = 1280; DCMI_RS = 48*i; DCMI_CS = 0; HAL_DCMI_ConfigCrop (&hdcmi, DCMI_CS, DCMI_RS, DCMI_CN, DCMI_RN); HAL_Delay(1); HAL_DCMI_EnableCrop (&hdcmi); HAL_Delay(1); dcmi_dma_status = HAL_DCMI_Start_DMA(&hdcmi, DCMI_MODE_SNAPSHOT, dcmi_data_buff, DCMI_CN*DCMI_RN/4); while(HAL_DMA_GetState(&hdcmi)==HAL_DMA_STATE_BUSY) ; HAL_DCMI_Stop(&hdcmi); tx_busy = 1; HAL_UART_Transmit_DMA(&huart1, (uint8_t *)dcmi_data_buff, 61440); while(tx_busy!=0) HAL_Delay(1); } } /* USER CODE END WHILE */ /* USER CODE BEGIN 3 */ } /* USER CODE END 3 */ } /** * @brief System Clock Configuration * @retval None */ void SystemClock_Config(void) { RCC_OscInitTypeDef RCC_OscInitStruct = {0}; RCC_ClkInitTypeDef RCC_ClkInitStruct = {0}; /** Supply configuration update enable */ HAL_PWREx_ConfigSupply(PWR_LDO_SUPPLY); /** Configure the main internal regulator output voltage */ __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE0); while(!__HAL_PWR_GET_FLAG(PWR_FLAG_VOSRDY)) {} /** Initializes the RCC Oscillators according to the specified parameters * in the RCC_OscInitTypeDef structure. */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48|RCC_OSCILLATORTYPE_HSI; RCC_OscInitStruct.HSIState = RCC_HSI_DIV1; RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT; RCC_OscInitStruct.HSI48State = RCC_HSI48_ON; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI; RCC_OscInitStruct.PLL.PLLM = 32; RCC_OscInitStruct.PLL.PLLN = 480; RCC_OscInitStruct.PLL.PLLP = 2; RCC_OscInitStruct.PLL.PLLQ = 2; RCC_OscInitStruct.PLL.PLLR = 2; RCC_OscInitStruct.PLL.PLLRGE = RCC_PLL1VCIRANGE_1; RCC_OscInitStruct.PLL.PLLVCOSEL = RCC_PLL1VCOWIDE; RCC_OscInitStruct.PLL.PLLFRACN = 0; if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { Error_Handler(); } /** Initializes the CPU, AHB and APB buses clocks */ RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2 |RCC_CLOCKTYPE_D3PCLK1|RCC_CLOCKTYPE_D1PCLK1; RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV2; RCC_ClkInitStruct.APB3CLKDivider = RCC_APB3_DIV2; RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV2; RCC_ClkInitStruct.APB2CLKDivider = RCC_APB2_DIV2; RCC_ClkInitStruct.APB4CLKDivider = RCC_APB4_DIV2; if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK) { Error_Handler(); } HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_HSI48, RCC_MCODIV_2); } /** * @brief DCMI Initialization Function * @param None * @retval None */ static void MX_DCMI_Init(void) { /* USER CODE BEGIN DCMI_Init 0 */ /* USER CODE END DCMI_Init 0 */ /* USER CODE BEGIN DCMI_Init 1 */ /* USER CODE END DCMI_Init 1 */ hdcmi.Instance = DCMI; hdcmi.Init.SynchroMode = DCMI_SYNCHRO_EMBEDDED; hdcmi.Init.PCKPolarity = DCMI_PCKPOLARITY_RISING; hdcmi.Init.CaptureRate = DCMI_CR_ALL_FRAME; hdcmi.Init.ExtendedDataMode = DCMI_EXTEND_DATA_8B; hdcmi.Init.SyncroCode.FrameEndCode = 0; hdcmi.Init.SyncroCode.FrameStartCode = 0; hdcmi.Init.SyncroCode.LineStartCode = 0; hdcmi.Init.SyncroCode.LineEndCode = 0; hdcmi.Init.JPEGMode = DCMI_JPEG_DISABLE; hdcmi.Init.ByteSelectMode = DCMI_BSM_ALL; hdcmi.Init.ByteSelectStart = DCMI_OEBS_ODD; hdcmi.Init.LineSelectMode = DCMI_LSM_ALL; hdcmi.Init.LineSelectStart = DCMI_OELS_ODD; if (HAL_DCMI_Init(&hdcmi) != HAL_OK) { Error_Handler(); } /* USER CODE BEGIN DCMI_Init 2 */ /* USER CODE END DCMI_Init 2 */ } /** * @brief USART1 Initialization Function * @param None * @retval None */ static void MX_USART1_UART_Init(void) { /* USER CODE BEGIN USART1_Init 0 */ /* USER CODE END USART1_Init 0 */ /* USER CODE BEGIN USART1_Init 1 */ /* USER CODE END USART1_Init 1 */ huart1.Instance = USART1; huart1.Init.BaudRate = 230400; huart1.Init.WordLength = UART_WORDLENGTH_8B; huart1.Init.StopBits = UART_STOPBITS_1; huart1.Init.Parity = UART_PARITY_NONE; huart1.Init.Mode = UART_MODE_TX_RX; huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE; huart1.Init.OverSampling = UART_OVERSAMPLING_16; huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE; huart1.Init.ClockPrescaler = UART_PRESCALER_DIV1; huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT; if (HAL_UART_Init(&huart1) != HAL_OK) { Error_Handler(); } if (HAL_UARTEx_SetTxFifoThreshold(&huart1, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK) { Error_Handler(); } if (HAL_UARTEx_SetRxFifoThreshold(&huart1, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK) { Error_Handler(); } if (HAL_UARTEx_DisableFifoMode(&huart1) != HAL_OK) { Error_Handler(); } /* USER CODE BEGIN USART1_Init 2 */ /* USER CODE END USART1_Init 2 */ } /** * Enable DMA controller clock */ static void MX_DMA_Init(void) { /* DMA controller clock enable */ __HAL_RCC_DMA1_CLK_ENABLE(); /* DMA interrupt init */ /* DMA1_Stream0_IRQn interrupt configuration */ HAL_NVIC_SetPriority(DMA1_Stream0_IRQn, 0, 0); HAL_NVIC_EnableIRQ(DMA1_Stream0_IRQn); /* DMA1_Stream1_IRQn interrupt configuration */ HAL_NVIC_SetPriority(DMA1_Stream1_IRQn, 0, 0); HAL_NVIC_EnableIRQ(DMA1_Stream1_IRQn); } /** * @brief GPIO Initialization Function * @param None * @retval None */ static void MX_GPIO_Init(void) { GPIO_InitTypeDef GPIO_InitStruct = {0}; /* GPIO Ports Clock Enable */ __HAL_RCC_GPIOA_CLK_ENABLE(); __HAL_RCC_GPIOE_CLK_ENABLE(); __HAL_RCC_GPIOD_CLK_ENABLE(); __HAL_RCC_GPIOC_CLK_ENABLE(); __HAL_RCC_GPIOB_CLK_ENABLE(); /*Configure GPIO pin Output Level */ HAL_GPIO_WritePin(GPIOE, GPIO_PIN_7|GPIO_PIN_8, GPIO_PIN_SET); /*Configure GPIO pin Output Level */ HAL_GPIO_WritePin(GPIOD, GPIO_PIN_10, GPIO_PIN_SET); /*Configure GPIO pin Output Level */ HAL_GPIO_WritePin(GPIOD, GPIO_PIN_11, GPIO_PIN_RESET); /*Configure GPIO pins : PE7 PE8 */ GPIO_InitStruct.Pin = GPIO_PIN_7|GPIO_PIN_8; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH; HAL_GPIO_Init(GPIOE, &GPIO_InitStruct); /*Configure GPIO pins : PD10 PD11 */ GPIO_InitStruct.Pin = GPIO_PIN_10|GPIO_PIN_11; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH; HAL_GPIO_Init(GPIOD, &GPIO_InitStruct); /*Configure GPIO pin : PA8 */ GPIO_InitStruct.Pin = GPIO_PIN_8; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH; GPIO_InitStruct.Alternate = GPIO_AF0_MCO; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); } /* USER CODE BEGIN 4 */ void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart) { if (huart == &huart1) { if (aRxBuffer==0x01) { scmd = 0x02; aRxBuffer=0x00; HAL_UART_Receive_IT(&huart1, (uint8_t *)&aRxBuffer, 1); } else { HAL_UART_Receive_IT(&huart1, (uint8_t *)&aRxBuffer, 1); } } return; } void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart) { extern uint8_t tx_busy; if (huart == &huart1) { tx_busy = 0; } } void DCMI_DMA_MemInc_En(void) { HAL_DMA_DeInit(&hdma_dcmi); hdma_dcmi.Init.MemInc = DMA_MINC_ENABLE; if (HAL_DMA_Init(&hdma_dcmi) != HAL_OK) { Error_Handler(); } } void DCMI_DMA_MemInc_Den(void) { HAL_DMA_DeInit(&hdma_dcmi); hdma_dcmi.Init.MemInc = DMA_MINC_DISABLE; if (HAL_DMA_Init(&hdma_dcmi) != HAL_OK) { Error_Handler(); } } void PY_DCMI_Full_Init(void) { hdcmi.Instance = DCMI; hdcmi.Init.SynchroMode = DCMI_SYNCHRO_HARDWARE; hdcmi.Init.PCKPolarity = DCMI_PCKPOLARITY_RISING; hdcmi.Init.VSPolarity = DCMI_VSPOLARITY_HIGH; hdcmi.Init.HSPolarity = DCMI_HSPOLARITY_LOW; hdcmi.Init.CaptureRate = DCMI_CR_ALL_FRAME; hdcmi.Init.ExtendedDataMode = DCMI_EXTEND_DATA_8B; hdcmi.Init.JPEGMode = DCMI_JPEG_DISABLE; hdcmi.Init.ByteSelectMode = DCMI_BSM_ALL; hdcmi.Init.ByteSelectStart = DCMI_OEBS_ODD; hdcmi.Init.LineSelectMode = DCMI_LSM_ALL; hdcmi.Init.LineSelectStart = DCMI_OELS_ODD; if (HAL_DCMI_Init(&hdcmi) != HAL_OK) { Error_Handler(); } } /* USER CODE END 4 */ /** * @brief This function is executed in case of error occurrence. * @retval None */ void Error_Handler(void) { /* USER CODE BEGIN Error_Handler_Debug */ /* User can add his own implementation to report the HAL error return state */ __disable_irq(); while (1) { } /* USER CODE END Error_Handler_Debug */ } #ifdef USE_FULL_ASSERT /** * @brief Reports the name of the source file and the source line number * where the assert_param error has occurred. * @param file: pointer to the source file name * @param line: assert_param error line source number * @retval None */ void assert_failed(uint8_t *file, uint32_t line) { /* USER CODE BEGIN 6 */ /* User can add his own implementation to report the file name and line number, ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ /* USER CODE END 6 */ } #endif /* USE_FULL_ASSERT */ /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
基于STM32CUBEIDE工程:
https://download.csdn.net/download/hwytree/20372220
配套测试用上位机软件分为一维码识别和二维码识别两个软件,下载地址:
一维码识别
https://download.csdn.net/download/hwytree/20306099
二维码识别
https://download.csdn.net/download/hwytree/20306112
https://blog.csdn.net/hwytree/article/details/119004881
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