博流BL606P音视频开发板：驱动MAX7219点阵模组

编辑语：

芯片开放社区（OCC）面向广大开发者推出应用实战系列内容，通过分享开发者实战开发案例，总结应用开发经验，梳理开发中的常见问题及解决方案，为后续参与的开发者提供更多参考与借鉴。

本文是关于开发者 乘简基于BL606P-DVK开发板实战开发的系列文章中的一篇，主要介绍了驱动MAX7219点阵模组，后面还会持续更新社区开发者的测评内容，敬请期待！

01硬件部分

我买了一款MAX7219芯片的点阵模块，8个8x8连在一起的模块，只需要3个GPIO口即可驱动，可以显示两个16x16点阵的汉字

连线图：

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

main.c的代码：

#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//点阵模块数量

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*/
};
 

//写1个字节
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();
    }
}

//写入配置数据
void max7219_writeset(uint8_t address, uint8_t dat)
{
    uint8_t i;
    
    cs_l();
    for(i=0;i

02演示效果