de2-115-fpga-pong/software/hello_world_bsp/HAL/src/alt_putchar.c

/******************************************************************************
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* License Agreement                                                           *
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#include <stdio.h>

#ifdef ALT_USE_DIRECT_DRIVERS
#include "system.h"
#include "sys/alt_driver.h"
#include "sys/alt_stdio.h"
#endif
#ifdef ALT_SEMIHOSTING
#include "sys/alt_stdio.h"
#include "unistd.h"
#endif

/*
 * Uses the ALT_DRIVER_WRITE() macro to call directly to driver if available.
 * Otherwise, uses newlib provided putchar() routine.
 */
int 
alt_putchar(int c)
{
#ifdef ALT_SEMIHOSTING
	char        c1 = (char)(c & 0xff);
    return write(STDOUT_FILENO,&c1,1);
#else
#ifdef ALT_USE_DIRECT_DRIVERS
    ALT_DRIVER_WRITE_EXTERNS(ALT_STDOUT_DEV);
    char        c1 = (char)(c & 0xff);

    if (ALT_DRIVER_WRITE(ALT_STDOUT_DEV, &c1, 1, 0) == -1) {
        return -1;
    }
    return c;
#else
    return putchar(c);
#endif
#endif
}