Cortex-M3专用ARM_ST7920驱动程序详解及分享

#include "LPC17xx.h" // LPC1768 ST7920 128*64 主要性能描述参见PDFST7920.pdf
#include <stdint.h>  // 定义uint8_t格式变量类型

#define DELAY_N 20    // 命令延时，太快会导致写操作失败或出错  min:20
#define DELAY_CLR 200    // 清屏函数的延时，大些，否则液晶屏开始处有乱码
#define TIMER  150000 // 显示延时，延时函数参量max:uint32_t
#define NUM 7    // 能够显示的数据的总位数，不包括符号位

#define LCD_RS_1   LPC_GPIO0->FIOPIN |=  (1<<18)//相应位0.18置1，即置位
#define LCD_RS_0 LPC_GPIO0->FIOPIN &= ~(1<<18)//相应位0.18置0，即清零
#define LCD_RW_1 LPC_GPIO0->FIOPIN |=  (1<<19)
#define LCD_RW_0 LPC_GPIO0->FIOPIN &= ~(1<<19)
#define LCD_E_1     LPC_GPIO0->FIOPIN |=  (1<<20)
#define LCD_E_0     LPC_GPIO0->FIOPIN &= ~(1<<20)
#define LCD_PSB_1 LPC_GPIO0->FIOPIN |=  (1<<21)
#define LCD_PSB_0   LPC_GPIO0->FIOPIN &= ~(1<<21)
// RS  0.18
// RW  0.19
// E   0.20
// PSB  0.21
// DB0~7 对应ARM的2.0~2.7
//2.0~2.7 , 以及0.18~0.21 端口都设置为输出

//正弦波表，取点表 
int TABLE_SIN[46]={ 0,4,8,12,16,19,22,25,27,29,30,30,30,29,28,26,24,
21,18,14,10,6,2,-2,-6,-10,-14,-18,-21,-24,-26,-28,-29,
-30,-30,-30,-29,-27,-25,-22, -19,-16,-12,-8, -4,0};  
uint8_t TABLE_DOT[8]={0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01};
uint8_t TABLE_DOT_DOUBLE[8]={0x80,0xc0,0x60,0x30,0x18,0x0c,0x06,0x03};
uint8_t PICTURE[32*32]={0};    //最终要画的图

void Delay(uint32_t count)    // 延时函数，与宏定义DELAY_N配合使用
{
uint8_t j;
while(count--)
    {
     for(j=0;j<0x7f;j++);
    }
}

void LCD_Wcmd(uint8_t cmd)    //写命令
{
Delay(DELAY_N);
    LCD_RS_0;
    LCD_RW_0;
    LCD_E_0;
    LPC_GPIO2->FIOPIN0=cmd;    //命令写到2.0~2.7端口
    LCD_E_1;
    LCD_E_0;
}

void LCD_Wdata(uint8_t data)   //写数据，时序参考PDF
{
    Delay(DELAY_N);
    LCD_RS_1;
    LCD_RW_0;
    LCD_E_0;
    LPC_GPIO2->FIOPIN0=data;   //数据写到2.0~2.7端口
    LCD_E_1;
    LCD_E_0;