HT1621段式液晶驱动代码

HT1621是一种常见的段式液晶驱动芯片，其驱动代码如下：

#include <ht1621.h>

#define HT1621_WR  2  // HT1621写入引脚
#define HT1621_RD  3  // HT1621读取引脚
#define HT1621_CS  4  // HT1621片选引脚

void HT1621_Write(unsigned char data, unsigned char cnt)
{
    unsigned char i;

    pinMode(HT1621_WR, OUTPUT);
    pinMode(HT1621_RD, OUTPUT);
    pinMode(HT1621_CS, OUTPUT);

    digitalWrite(HT1621_CS, LOW);
    for (i = 0; i < cnt; i++)
    {
        digitalWrite(HT1621_WR, LOW);
        shiftOut(HT1621_WR, HT1621_RD, MSBFIRST, data);
        digitalWrite(HT1621_WR, HIGH);
        data >>= 1;
    }
    digitalWrite(HT1621_CS, HIGH);
}

void HT1621_Init(void)
{
    HT1621_Write(0x52, 4);  // 启动系统振荡器
    HT1621_Write(0x80, 3);  // 设置系统时钟，1/3Duty，4COM，Bias=1/2
    HT1621_Write(0xA4, 3);  // 停止显示
    HT1621_Write(0xEB, 4);  // 设置LCD偏压电压
    HT1621_Write(0x40, 8);  // 初始化显示RAM
    HT1621_Write(0xA6, 3);  // 正常显示，不反转
}

void HT1621_Display(unsigned char *buffer, unsigned char cnt)
{
    unsigned char i;

    HT1621_Write(0xA4, 3);  // 停止显示

    HT1621_Write(0x40, 8);  // 初始化显示RAM
    for (i = 0; i < cnt; i++)
    {
        HT1621_Write(buffer[i], 4);
    }

    HT1621_Write(0xA2, 3);  // 打开显示，不闪烁
}

其中，`HT1621_Write`函数用于向HT1621芯片写入数据，`HT1621_Init`函数用于初始化HT1621芯片，`HT1621_Display`函数用于显示数据。在使用HT1621芯片时，需要先调用`HT1621_Init`函数进行初始化，然后再调用`HT1621_Display`函数显示数据。