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

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#pragma once
#include "com_iface.h"
/** Debug USART iface */
extern ComIface *debug_iface;
/** ESP8266 com iface */
extern ComIface *data_iface;
/** Do-nothing iface */
extern ComIface *com_iface_noop;
/** File descriptors for use with built-in "files" */
enum {
FD_STDIN = 0,
FD_STDOUT = 1,
FD_STDERR = 2,
FD_DLNK = 3,
};
#define FNAME_DLNK "dlnk"