原创 HT16511的驱动程序

 2007-11-12 21:33  1928 2 2 分类: 电源/新能源

使用LPC2220的GPIO模拟SPI协议，驱动HT16511芯片

首先定义：

#define HTDO GPIOA0
#define HTDI GPIOA2
#define HTCLK GPIOA4
#define HTCS GPIOA6

//向HT16511写一个字符
extern void write_char(unsigned char data)
{
unsigned char k;

for (k=0;k<8;k++)
{
  gpio_set(HTCLK);

  if (data & 0x01 == 0x01)
  {gpio_clr(HTDI);}
  else
  {gpio_set(HTDI);}

  delay(50);
  gpio_clr(HTCLK);
  delay(50);

  data = data>>1;
}
return;
}

//从HT16511读一个字符
extern unsigned char read_char(void)
{
register char i;
unsigned char temp="0";

for(i=0;i<8;i++)
{
  gpio_clr(HTCLK);
  delay(50);
  gpio_set(HTCLK);
  delay(25);

  temp=temp>>1;

  if(gpio_get(HTDO))
  {temp &= ~0x80;}
  else
  {temp |= 0x80;}

  delay(25);
}
return temp;
}

//刷新显示
extern void update_disp(unsigned char *disp_data)
{
unsigned char i;

//发送0x40，数据模式：一般模式、地址自增、向显存写数据
    gpio_clr(HTCS);
    delay(100);
    gpio_set(HTCS);

    write_char(0x40);

    //发送0xc0，设置地址为00H
    gpio_clr(HTCS);
    delay(100);
    gpio_set(HTCS);

    write_char(0xc0);

    //向显示RAM发送数据
    for(i=0;i<36;i++)
    {write_char(*(i+disp_data));}

    //发送0x8f，打开显示
    gpio_clr(HTCS);
    delay(100);
    gpio_set(HTCS);

    write_char(0x8f);
    return;
}