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