0.9寸OLED 驱动程序，基于linux platform tree 下I2C 接口

/*************************************************************** Copyright 2024-2029. All rights reserved. 文件名 : drv_oled.c 作者 : tangmingfei2013@126.com 版本 : V1.0 描述 : oled 驱动程序 其他 : 无 日志 : 初版V1.0 2024/02/23 ***************************************************************/ #include <sys/types.h> #include <sys/stat.h> #include <linux/types.h> #include <linux/i2c-dev.h> #include <linux/i2c.h> #include <sys/ioctl.h> #include <unistd.h> #include <stdio.h> #include <string.h> #include <fcntl.h> #include <stdlib.h> #include <linux/fs.h> #include <errno.h> #include <assert.h> #include <string.h> #include <time.h> #include "drv_oled.h" #include "font.h" #define DEV_FILE "/dev/i2c-1" #define grayoled_swap(a, b) \ (((a) ^= (b)), ((b) ^= (a)), ((a) ^= (b))) ///< No-temp-var swap operation static int fd = -1; static unsigned char charSize=0; static int oled_write_reg( unsigned char data, unsigned char mode) { int ret = -1; unsigned char buf[2] = {0}; if( mode ){ buf[0] = 0x40; } else { buf[0] = 0; } buf[1] = data; ret = write(fd, buf, 2); if( ret < 0 ) { printf("write cmd to oled register failure.\n"); return -1; } return 0; } static void oled_drv_Init(void) { oled_write_reg(0xAE,PARA);//--display off oled_write_reg(0x00,PARA);//---set low column address oled_write_reg(0x10,PARA);//---set high column address oled_write_reg(0x40,PARA);//--set start line address oled_write_reg(0xB0,PARA);//--set page address oled_write_reg(0x81,PARA); // contract control oled_write_reg(0xFF,PARA);//--128 oled_write_reg(0xA1,PARA);//set segment remap oled_write_reg(0xA6,PARA);//--normal / reverse oled_write_reg(0xA8,PARA);//--set multiplex ratio(1 to 64) oled_write_reg(0x3F,PARA);//--1/32 duty oled_write_reg(0xC8,PARA);//Com scan direction oled_write_reg(0xD3,PARA);//-set display offset oled_write_reg(0x00,PARA);// oled_write_reg(0xD5,PARA);//set osc division oled_write_reg(0x80,PARA);// oled_write_reg(0xD8,PARA);//set area color mode off oled_write_reg(0x05,PARA);// oled_write_reg(0xD9,PARA);//Set Pre-Charge Period oled_write_reg(0xF1,PARA);// oled_write_reg(0xDA,PARA);//set com pin configuartion oled_write_reg(0x12,PARA);// oled_write_reg(0xDB,PARA);//set Vcomh oled_write_reg(0x30,PARA);// oled_write_reg(0x8D,PARA);//set charge pump enable oled_write_reg(0x14,PARA);// oled_write_reg(0xAF,PARA);//--turn on oled panel oled_clear(); } void oled_clear(void) { unsigned char i,n; for(i=0;i<8;i++) { oled_write_reg (0xb0+i,PARA); oled_write_reg (0x00,PARA); oled_write_reg (0x10,PARA); for( n = 0;n < 128; n++) { oled_write_reg(0,DATA); } } } void oled_release( void ) { close( fd ); } int oled_init(void) { // init i2c fd = open(DEV_FILE, O_RDWR); if( fd < 0 ) { close( fd ); printf("%s %s i2c device open failure: %s\n", __FILE__, __FUNCTION__, strerror(errno)); return -1; } ioctl(fd, I2C_TENBIT, 0); ioctl(fd, I2C_SLAVE, OLED_ADDR); oled_drv_Init(); return fd; } /* oled 12864 API */ void oled_setCharSize( unsigned char val ) { charSize = val; } void oled_setPostion( unsigned char x, unsigned char y) { oled_write_reg(0xb0+y,PARA); oled_write_reg(((x&0xf0)>>4)|0x10,PARA); oled_write_reg((x&0x0f),PARA); } void oled_displayOn(void) { oled_write_reg(0X8D,PARA); oled_write_reg(0X14,PARA); oled_write_reg(0XAF,PARA); } void oled_displayOff(void) { oled_write_reg(0X8D,PARA); oled_write_reg(0X10,PARA); oled_write_reg(0XAE,PARA); } void oled_upScreenOn(void) { unsigned char i,n; for(i=0;i<8;i++) { oled_write_reg (0xb0+i,PARA); oled_write_reg (0x00,PARA); oled_write_reg (0x10,PARA); for(n=0;n<128;n++) { oled_write_reg(1,DATA); } } } void oled_printfChar(unsigned char x,unsigned char y,unsigned char val ) { unsigned char character = 0; unsigned char i=0; character = val-' '; if( x > X_WIDTH-1) { x = 0; y += 2; } if( charSize == FONT_16 ) { oled_setPostion(x,y); for( i = 0; i < 8; i++) { oled_write_reg(F8X16[character*16+i],DATA); } oled_setPostion(x,y+1); for(i=0;i<8;i++) { oled_write_reg(F8X16[character*16+i+8],DATA); } } else { oled_setPostion(x,y); for(i=0;i<6;i++) { oled_write_reg(F6x8[character][i],DATA); } } } void oled_printfString(unsigned char x,unsigned char y,unsigned char *str ) { unsigned char index = 0; while ( str[index]!='\0' ) { oled_printfChar(x,y,str[index] ); x += 8; if( x > 120 ) { x=0; y+=2; } index++; } } void oled_printmutiChar(unsigned char x,unsigned char y,unsigned char *str, unsigned char length ) { unsigned char index = 0; for( index = 0; index < length; index++ ) { oled_printfChar(x,y,str[index] ); x += 8; if( x > 120 ) { x=0; y+=2; } } } /* Eed of this file */