今天搞了一下MAX7219。
代码:
#include <SI_EFM8SB2_Register_Enums.h> // SFR declarations
#include "InitDevice.h"
SI_SBIT(LED, SFR_P1, 4); // LED
SI_SBIT(S1, SFR_P0, 2); // BTN0
SI_SBIT(CLK, SFR_P0, 5); // CLK
SI_SBIT(LOAD, SFR_P0, 4); // LOAD
SI_SBIT(DIN, SFR_P0, 3); // DIN
#define uchar unsigned char
#define uint unsigned int
#define SYSCLK 24500000/8 // Clock speed in Hz (default)
#define SW_PRESSED 0
#define SW_NOT_PRESSED 1
#define LED_ON 0
#define LED_OFF 1
#define CLK_0 0
#define CLK_1 1
#define LOAD_0 0
#define LOAD_1 1
#define DIN_0 0
#define DIN_1 1
#define NoOp 0x00 //空操作寄存器
#define Digit0 0x01 // 数码管1寄存器
#define Digit1 0x02 // 数码管2寄存器
#define Digit2 0x03 // 数码管3寄存器
#define Digit3 0x04 // 数码管4寄存器
#define Digit4 0x05 // 数码管5寄存器
#define Digit5 0x06 // 数码管6寄存器
#define Digit6 0x07 // 数码管7寄存器
#define Digit7 0x08 // 数码管8寄存器
#define DecodeMode 0x09 // 译码模式寄存器
#define Intensity 0x0a // 亮度寄存器
#define ScanLimit 0x0b // 扫描位数寄存器
#define ShutDown 0x0c // 低功耗模式寄存器
#define DisplayTest 0x0f // 显示测试寄存器
#define ShutdownMode 0x00 // 低功耗方式
#define NormalOperation 0x01 // 正常操作方式
#define ScanDigit 0x07 // 扫描位数设置,显示8位数码管
#define DecodeDigit 0xff // 译码设置,8位均为BCD码
#define IntensityGrade 0x0a // 亮度级别设置
#define TestMode 0x01 // 显示测试模式
#define TextEnd 0x00 // 显示测试结束,恢复正常工作模式
/*****************************************************************************
* Function implementation - global ('extern') and local ('static')
******************************************************************************/
uchar DisBuffer[8]={0,0,0,0,0,0,0,0}; // 显示缓存区
unsigned int j;
//******************延时t毫秒**************************************
void delay(uint t)
{
uint i;
while(t--)
{
/* 对于12M时钟,约延时1ms */
for (i=0;i<125;i++)
{}
}
}
//*************向MAX7219写入字节(8位)********************
void SendChar (uchar ch)
{
uchar i,temp;
delay(1);
for (i=0;i<8;i++)
{
temp=ch&0x80;
ch=ch<<1;
if(temp)
{
DIN=DIN_1;
//for(j=0;j<30;j++);
CLK=CLK_0;
//for(j=0;j<30;j++);
CLK=CLK_1;
//for(j=0;j<30;j++);
}
else
{
DIN=DIN_0;
//for(j=0;j<30;j++);
CLK=CLK_0;
//for(j=0;j<30;j++);
CLK=CLK_1;
//for(j=0;j<30;j++);
}
}
}
//**************向MAX7219写入字(16位)*****************************
void WriteWord (uchar addr,uchar num)
{
LOAD=LOAD_0;
//delay(1);
SendChar(addr);
//delay(1);
SendChar(num);
//delay(1);
LOAD=LOAD_1; // 锁存进相应寄存器
}
//*********************** MAX7219初始化 ******************
void InitDisplay (void)
{
WriteWord (ScanLimit,ScanDigit); // 设置扫描界限
WriteWord (DecodeMode,DecodeDigit); // 设置译码模式
WriteWord (Intensity,IntensityGrade); // 设置亮度
WriteWord (ShutDown,NormalOperation); // 设置为正常工作模式
}
//-----------------------------------------------------------------------------
// SiLabs_Startup() Routine
// ----------------------------------------------------------------------------
// This function is called immediately after reset, before the initialization
// code is run in SILABS_STARTUP.A51 (which runs before main() ). This is a
// useful place to disable the watchdog timer, which is enable by default
// and may trigger before main() in some instances.
//-----------------------------------------------------------------------------
void SiLabs_Startup (void)
{
// Disable the watchdog here
}
//-----------------------------------------------------------------------------
// main() Routine
// ----------------------------------------------------------------------------
// Note: the software watchdog timer is not disabled by default in this
// example, so a long-running program will reset periodically unless
// the timer is disabled or your program periodically writes to it.
//
// Review the "Watchdog Timer" section under the part family's datasheet
// for details. To find the datasheet, select your part in the
// Simplicity Launcher and click on "Data Sheet".
//-----------------------------------------------------------------------------
int main (void)
{
uint i;
uchar k=0;
enter_DefaultMode_from_RESET();
InitDisplay (); // MAX7219初始化
WriteWord(DisplayTest,TestMode); // 开始显示测试,点亮所有LED
delay(1500); // 延时约1.5s
WriteWord (DisplayTest,TextEnd); // 退出显示测试模式
WriteWord (Digit0,0);
WriteWord (Digit1,1);
WriteWord (Digit2,2);
WriteWord (Digit3,3);
while (1)
{
LED = LED_OFF;
DIN=DIN_1;
for(i=0;i<60000;i++);
LED = LED_ON;
DIN=DIN_0;
for(i=0;i<60000;i++);
InitDisplay (); // MAX7219初始化
WriteWord (Digit0,0);
WriteWord (Digit1,1);
WriteWord (Digit2,2);
WriteWord (Digit3,k);
k++;
if(k>=10)
k=0;
} // Spin forever
}
效果图:
照片拍的不太好。
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