STM8L驱动I2C类型的12864

原理

之前没有操作过12864这种类型的屏，但是，操作过其他类型的，原理都是相通的。12864是拥有128x64像素点这类屏幕的称号吧。屏幕有64行，128列；每个汉字是16x16，所以一个这样的屏，最多可以显示4x8的汉字或者8x16的字符。

我使用的是不带字库的I2C接口的屏幕，主芯片是ST7656。这样的屏，只能写，不能读。先配置屏幕，然后通过字模制作软件制作出待显示内容的像素数字，最后，通过数据线传送给屏幕显示。了解了原理后，接下来就根据主芯片的数据手册进行配置屏幕就好了。

硬件连线

• CS：片选
• RST: 复位
• RS：数据或命令选择
• SDA：I2C数据线
• SCL：I2C时钟线

I2C采用的是软件模拟的

底层写操作

#define IO_ST7565_CS_0 GPIO_WriteBit(GPIOB, GPIO_Pin_5, RESET) #define IO_ST7565_CS_1 GPIO_WriteBit(GPIOB, GPIO_Pin_5, SET)#define IO_ST7565_SDA_0 GPIO_WriteBit(GPIOB, GPIO_Pin_1, RESET) #define IO_ST7565_SDA_1 GPIO_WriteBit(GPIOB, GPIO_Pin_1, SET) #define IO_ST7565_SCK_0 GPIO_WriteBit(GPIOB, GPIO_Pin_2, RESET) #define IO_ST7565_SCK_1 GPIO_WriteBit(GPIOB, GPIO_Pin_2, SET) #define IO_ST7565_RST_0 GPIO_WriteBit(GPIOB, GPIO_Pin_4, RESET) #define IO_ST7565_RST_1 GPIO_WriteBit(GPIOB, GPIO_Pin_4, SET)#define IO_ST7565_RS_0 GPIO_WriteBit(GPIOB, GPIO_Pin_3, RESET) #define IO_ST7565_RS_1 GPIO_WriteBit(GPIOB, GPIO_Pin_3, SET)static void io_delay(uint16_t nCount) {while (nCount--); }/* rs == 1 data rs==0 cmd */ void ST7565_Write(uint8_t dat,uint8_t rs) {uint8_t i;IO_ST7565_SCK_0;IO_ST7565_CS_0;if(!rs){IO_ST7565_RS_0; //Command}else{IO_ST7565_RS_1;}io_delay(5);for(i = 0; i < 8; i++){ if( dat & 0x80){IO_ST7565_SDA_1;}else{IO_ST7565_SDA_0;}dat <<= 1;IO_ST7565_SCK_1;io_delay(5);IO_ST7565_SCK_0;io_delay(5);}io_delay(5);IO_ST7565_CS_1;IO_ST7565_RS_1;io_delay(5); }/* write cmd */ void writec(uint8_t com) { ST7565_Write(com,0); }/* write data */ void writed(uint8_t dat) { ST7565_Write(dat,1); }

初始化

void LcmClear(uint8_t FillData) {uint8_t i,j;for(i=0;i<8;i++){writec(0xB0|i); //Set Page Addresswritec(0x10); //Set Column Address = 0writec(0x00); //Colum from S1 -> S128 auto addfor(j=0;j<132;j++){writed( FillData );}} }void LcmInit(void) {IO_ST7565_CS_1;IO_ST7565_RST_0;delay_ms(10); //hard reset for 10msIO_ST7565_RST_1;delay_ms(10); writec(0xAE); //Display OFFwritec(0xA2); //1/64 Duty 1/9 Biaswritec(0xA0); //ADC select S0->S131(玻璃设计用S1-S128)writec(0xC0); //com1 --> com64writec(0x24); //对某些模块没用,用的外部Rb/Rawritec(0x81); //Sets V0writec(48); //内部电位器调节对比度writec(0x2F); //voltage follower ON regulator ON booster ONwritec(0xA6); //Normal Display (not reverse dispplay)writec(0xA4); //Entire Display Disablewritec(0x40); //Set Display Start Line = com0writec(0xB0); //Set Page Address = 0writec(0x10); //Set Column Address 4 higher bits = 0writec(0x00); //Set Column Address 4 lower bits = 1 , from IC SEG1 -> SEG128LcmClear(0);writec(0xAF); //Display ON }

上面的这些命令代表什么含义，输入的命令值具体代表什么，都可以在ST7656的官方数据手册中找到答案。

应用

使用字模软件制作字模：

uint8_t hzk[] = {/*-- 文字: 请 0 --*//*-- 宋体12; 此字体下对应的点阵为：宽x高=16x16 --*/0x00,0x00,0xFE,0x04,0x08,0x00,0xFF,0xA8,0xA8,0xA8,0xAA,0xA9,0xFE,0x00,0x00,0x00,0x02,0x42,0x33,0x00,0x00,0x22,0x2A,0x2A,0x2A,0xFE,0x2A,0x2A,0x2A,0x22,0x02,0x00, }uint8_t num[] = {/*-- 文字: 0 --*//*-- 宋体12; 此字体下对应的点阵为：宽x高=8x16 --*/0x00,0x07,0x08,0x10,0x10,0x08,0x07,0x00,0x00,0xF0,0x08,0x04,0x04,0x08,0xF0,0x00, }/* page: 0 - 7; col: 0 - 128 */ void show_char(uint8_t page, uint8_t col, uint8_t *data) {uint8_t i;/* set page address */writec(0xB0 | page);/* set column address */writec(0x10 | col >> 4);writec(col & 0xf);for(i = 8; i < 16; i++) {writed(data[i]);}page++;/* set page address */writec(0xB0 | page);/* set column address */writec((0x10 | (col >> 4)));writec(col & 0xf);for(i = 0; i < 8; i++){writed(data[i]);} }/* page: 0/2/4/6; col: 0 - 128 */ void show_chinese(uint8_t page, uint8_t col, uint8_t *data) {uint8_t i;/* set page address */writec(0xB0 | page);/* set column address */writec(0x10 | col >> 4);writec(col & 0xf);for(i = 0; i < 16; i++) {writed(data[i]);}page++;/* set page address */writec(0xB0 | page);/* set column address */writec((0x10 | (col >> 4)));writec(col & 0xf);for(i = 16; i < 32; i++){writed(data[i]);} }show_chinese(4, 0x20, hzk); show_char(2, 0x30, num);

资料

字模软件: https://download.csdn.net/download/donglicaiju76152/10805852
ST7656数据手册: https://download.csdn.net/download/donglicaiju76152/10805849

总结

以上是生活随笔为你收集整理的STM8L驱动I2C类型的12864的全部内容，希望文章能够帮你解决所遇到的问题。

如果觉得生活随笔网站内容还不错，欢迎将生活随笔推荐给好友。