demo of driving MAX2719 dot matrix displays with STM32F103 Bluepill
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f103-dotmatrix/project/main.h

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#ifndef MAIN_H
#define MAIN_H
#include <stdint.h>
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <stm32f10x.h>
#define MIN(a,b) ((a)>(b)?(b):(a))
#define MAX(a,b) ((a)<(b)?(b):(a))
#define STR_HELPER(x) #x
#define STR(x) STR_HELPER(x)
#endif // MAIN_H