【MM32 eMiniBoard测评报告】+ MAX7219

1万 · 2020-4-20 19:18

今晚搞了一下MAX7219.
DIN:PC13
LOAD:PC14
CLK:PC15

代码：
#include "delay.h"
#include "sys.h"
#include "led.h"

#define uchar unsigned char
#define uint unsigned int

#define CLK_0          GPIO_ResetBits(GPIOC,GPIO_Pin_15)
#define CLK_1          GPIO_SetBits(GPIOC,GPIO_Pin_15)
#define LOAD_0       GPIO_ResetBits(GPIOC,GPIO_Pin_14)
#define LOAD_1       GPIO_SetBits(GPIOC,GPIO_Pin_14)
#define DIN_0          GPIO_ResetBits(GPIOC,GPIO_Pin_13)
#define DIN_1          GPIO_SetBits(GPIOC,GPIO_Pin_13)

#define NoOp 0x00          //??????
#define Digit0 0x01          // ???1???
#define Digit1 0x02          // ???2???
#define Digit2 0x03          // ???3???
#define Digit3 0x04          // ???4???
#define Digit4 0x05          // ???5???
#define Digit5 0x06          // ???6???
#define Digit6 0x07          // ???7???
#define Digit7 0x08          // ???8???

#define DecodeMode 0x09    // ???????
#define Intensity 0x0a       // ?????
#define ScanLimit 0x0b       // ???????
#define ShutDown 0x0c       // ????????

#define DisplayTest 0x0f    // ???????
#define ShutdownMode 0x00    // ?????
#define NormalOperation 0x01  // ??????
#define ScanDigit 0x07       // ??????,??8????
#define DecodeDigit 0xff    // ????,8???BCD?
#define IntensityGrade 0x0a // ??????
#define TestMode 0x01       // ??????
#define TextEnd 0x00       // ??????,????????

/*****************************************************************************
* Function implementation - global ('extern') and local ('static')
******************************************************************************/
uchar DisBuffer[8]={0,0,0,0,0,0,0,0}; // ?????
//******************??t??**************************************
void delay(uint t)
{
   uint i;
   while(t--)
   {
            /* ??12M??,???1ms */
            for (i=0;i<125;i++)
            {}
   }
}
//*************?MAX7219????(8?)********************
void SendChar (uchar ch)
{
uchar i,temp;
delay(1);
for (i=0;i<8;i++)
{
      temp=ch&0x80;
      ch=ch<<1;
      if(temp)
      {
         DIN_1;
         CLK_0;
         CLK_1;
      }
      else
      {
         DIN_0;
         CLK_0;
         CLK_1;
      }
}
}
//**************?MAX7219???(16?)*****************************
void WriteWord (uchar addr,uchar num)
{
LOAD_0;
delay(1);
SendChar(addr);
delay(1);
SendChar(num);
delay(1);
LOAD_1;                         // ????????
}
//*********************** MAX7219??? ******************
void InitDisplay (void)
{
WriteWord (ScanLimit,ScanDigit);       // ??????
WriteWord (DecodeMode,DecodeDigit);    // ??????
WriteWord (Intensity,IntensityGrade); // ????
WriteWord (ShutDown,NormalOperation); // ?????????

}
/********************************************************************************************************
**º¯ÊýÐÅÏ¢ £ºmain(void)
**¹¦ÄÜÃèÊö £º
**ÊäÈë²ÎÊý £ºÎÞ
**Êä³ö²ÎÊý £ºÎÞ
********************************************************************************************************/
int main(void)
{
delay_init();
LED_Init();
InitDisplay (); // MAX7219???
WriteWord(DisplayTest,TestMode);  // ??????,????LED
delay(1500);                   // ???1.5s
WriteWord (DisplayTest,TextEnd);  // ????????
WriteWord (Digit0,0);
WriteWord (Digit1,1);
WriteWord (Digit2,2);
WriteWord (Digit3,3);
while(1)             //ÎÞÏÞÑ»·
{
      LED1_TOGGLE();
      LED2_TOGGLE();
      LED3_TOGGLE();
      LED4_TOGGLE();
      delay_ms(300);
}
}

效果图：

工程：

MAX7219.rar (321.15 KB)