RISCV_picorv32_fpga/sw/firmware/print.c

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// This is free and unencumbered software released into the public domain.
//
// Anyone is free to copy, modify, publish, use, compile, sell, or
// distribute this software, either in source code form or as a compiled
// binary, for any purpose, commercial or non-commercial, and by any
// means.
#include "firmware.h"
#define OUTPORT 0xffff0040
//volatile int n;
void print_chr(char ch)
{
while (*((volatile uint32_t*)OUTPORT) == 0 )
{
// Spin waiting for UART Tx empty.
}
*((volatile uint32_t*)OUTPORT) = ch;
}
void print_str(const char *p)
{
while (*p != 0)
{
print_chr(*(p++));
}
}
void print_dec(unsigned int val)
{
char buffer[10];
char *p = buffer;
while (val || p == buffer) {
*(p++) = val % 10;
val = val / 10;
}
while (p != buffer) {
print_chr('0' + *(--p));
}
}
void print_hex(unsigned int val, int digits)
{
for (int i = (4*digits)-4; i >= 0; i -= 4)
print_chr("0123456789ABCDEF"[(val >> i) % 16]);
}