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芯片開放社區（OCC）面向廣大開發者推出應用實戰系列內容，通過分享開發者實戰開發案例，總結應用開發經驗，梳理開發中的常見問題及解決方案，為后續參與的開發者提供更多參考與借鑒。

本文是關于開發者 乘簡基于BL606P-DVK開發板實戰開發的系列文章中的一篇，主要介紹了驅動MAX7219點陣模組，后面還會持續更新社區開發者的測評內容，敬請期待！

01硬件部分

我買了一款MAX7219芯片的點陣模塊，8個8x8連在一起的模塊，只需要3個GPIO口即可驅動，可以顯示兩個16x16點陣的漢字

連線圖：

GPIO2連入DIN，GPIO3連入CS，GPIO4連入CLK，VCC接5V，GND接GND

main.c的代碼：

#include 
#include 
#include 
#include 
#include "app_main.h"
#include "max7219.h"

int main(int argc, char *argv[])
{
   board_yoc_init();
    max7219_Init();

    printf("
app start core clock %d........
", soc_get_cur_cpu_freq());
    
    Display();

    return 0;
}

max7219.h

#ifndef _MAX7219_H_
#define _MAX7219_H_

#include 
#include 
#include 

#define MODS_7219 8//點陣模塊數量

void max7219_Init();
void Display();

#endif

max7219.c

#include "max7219.h"

gpio_dev_t gpio_din = { GPIO_PIN_2, OUTPUT_PUSH_PULL, (void*)0 };
gpio_dev_t gpio_cs= { GPIO_PIN_3, OUTPUT_PUSH_PULL, (void*)0 };
gpio_dev_t gpio_clk = { GPIO_PIN_4, OUTPUT_PUSH_PULL, (void*)0 };

#define din_l()    hal_gpio_output_low(&gpio_din)
#define din_h()    hal_gpio_output_high(&gpio_din)

#define clk_l()    hal_gpio_output_low(&gpio_clk)
#define clk_h()    hal_gpio_output_high(&gpio_clk)

#define cs_l()    hal_gpio_output_low(&gpio_cs)
#define cs_h()    hal_gpio_output_high(&gpio_cs)


uint8_t FONT8[][8]={
    {0x38,0x44,0x44,0x44,0x44,0x44,0x44,0x38},/*"0",0*/
    {0x10,0x30,0x10,0x10,0x10,0x10,0x10,0x38},/*"1",1*/
    {0x38,0x44,0x44,0x08,0x10,0x20,0x40,0x7C},/*"2",2*/
    {0x38,0x44,0x04,0x18,0x04,0x04,0x44,0x38},/*"3",3*/
    {0x08,0x18,0x18,0x28,0x48,0x7C,0x08,0x1C},/*"4",4*/
    {0x7C,0x40,0x40,0x78,0x44,0x04,0x44,0x38},/*"5",5*/
    {0x18,0x24,0x40,0x58,0x64,0x44,0x44,0x38},/*"6",6*/
    {0x3C,0x04,0x08,0x08,0x10,0x10,0x10,0x10},/*"7",7*/
    {0x38,0x44,0x44,0x38,0x44,0x44,0x44,0x38},/*"8",8*/
    {0x38,0x44,0x44,0x4C,0x34,0x04,0x48,0x30},/*"9",9*/
};
 

//寫1個字節
void max7219_writebyte(uint8_t dat)
{
    uint8_t i;
    for(i=0;i<8;i++){
    clk_l();
    if(dat & 0x80)din_h();else din_l();
    dat<<=1;
    clk_h();
    }
}

//寫入配置數據
void max7219_writeset(uint8_t address, uint8_t dat)
{
    uint8_t i;
    
    cs_l();
    for(i=0;i

02演示效果

?