本帖最后由 比神乐 于 2021-1-27 17:29 编辑
今天捣鼓了一下MAX7219
MAX7219是数码管驱动芯片,模块是我自己做的。
硬件接线:
DIN:PD0
LOAD:PD2
CLK:PD4
代码:
#include <stdio.h>
#include "at32f4xx.h"
#include "at32_board.h"
/** @addtogroup AT32F407_StdPeriph_Examples
* @{
*/
/** @addtogroup GPIO_LEDToggle
* @{
*/
#define uchar unsigned char
#define uint unsigned int
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
#define CLK_0 CLK_GPIO->BRE = CLK_PIN
#define CLK_1 CLK_GPIO->BSRE = CLK_PIN
#define LOAD_0 LOAD_GPIO->BRE = LOAD_PIN
#define LOAD_1 LOAD_GPIO->BSRE = LOAD_PIN
#define DIN_0 DIN_GPIO->BRE = DIN_PIN
#define DIN_1 DIN_GPIO->BSRE = DIN_PIN
#define LED4_0 LED4_GPIO->BRE = LED4_PIN
#define LED4_1 LED4_GPIO->BSRE = LED4_PIN
#define LED2_0 LED2_GPIO->BRE = LED2_PIN
#define LED2_1 LED2_GPIO->BSRE = LED2_PIN
#define LED3_0 LED3_GPIO->BRE = LED3_PIN
#define LED3_1 LED3_GPIO->BSRE = LED3_PIN
#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
//******************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<3625;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_1;
delay(1);
CLK_0;
delay(1);
CLK_1;
delay(1);
}
else
{
DIN_0;
delay(1);
CLK_0;
delay(1);
CLK_1;
delay(1);
}
}
}
//**************向MAX7219写入字(16位)*****************************
void WriteWord (uchar addr,uchar num)
{
LOAD_0;
delay(1);
SendChar(addr);
delay(1);
SendChar(num);
delay(1);
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
}
void AT32_MAX7219_Init(void)
{
GPIO_InitType GPIO_InitStructure;
/*Enable the LED Clock*/
RCC_APB2PeriphClockCmd(CLK_GPIO_RCC_CLK|LOAD_GPIO_RCC_CLK|DIN_GPIO_RCC_CLK, ENABLE);
/*Configure the LED pin as ouput push-pull*/
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pins = CLK_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT_PP;
GPIO_InitStructure.GPIO_MaxSpeed = GPIO_MaxSpeed_2MHz;
GPIO_Init(CLK_GPIO, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pins = LOAD_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT_PP;
GPIO_InitStructure.GPIO_MaxSpeed = GPIO_MaxSpeed_2MHz;
GPIO_Init(LOAD_GPIO, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pins = DIN_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT_PP;
GPIO_InitStructure.GPIO_MaxSpeed = GPIO_MaxSpeed_2MHz;
GPIO_Init(DIN_GPIO, &GPIO_InitStructure);
}
void AT32_LED_Init(void)
{
GPIO_InitType GPIO_InitStructure;
/*Enable the LED Clock*/
RCC_APB2PeriphClockCmd(LED2_GPIO_RCC_CLK|LED3_GPIO_RCC_CLK|LED4_GPIO_RCC_CLK, ENABLE);
/*Configure the LED pin as ouput push-pull*/
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pins = LED2_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT_PP;
GPIO_InitStructure.GPIO_MaxSpeed = GPIO_MaxSpeed_2MHz;
GPIO_Init(LED2_GPIO, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pins = LED3_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT_PP;
GPIO_InitStructure.GPIO_MaxSpeed = GPIO_MaxSpeed_2MHz;
GPIO_Init(LED3_GPIO, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pins = LED4_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT_PP;
GPIO_InitStructure.GPIO_MaxSpeed = GPIO_MaxSpeed_2MHz;
GPIO_Init(LED4_GPIO, &GPIO_InitStructure);
}
/**
* [url=home.php?mod=space&uid=247401]@brief[/url] Main Function.
* @param None
* @retval None
*/
int main(void)
{
//AT32_Board_Init();
Delay_init();
AT32_LED_Init();
AT32_MAX7219_Init();
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);
for(;;)
{
// AT32_LEDn_Toggle(LED2);
// Delay_ms(1000);
LED2_0;
LED3_0;
LED4_0;
Delay_ms(1000);
LED2_1;
LED3_1;
LED4_1;
Delay_ms(1000);
}
}
效果图:
MAX7219模块原理图
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