max80_fw/rv32/console.h

#ifndef CONSOLE_H
#define CONSOLE_H

#include "compiler.h"
#include "io.h"

void __con_set_baudrate(uint32_t);
void con_putc(char c);
void con_puts(const char *);
void __fmt_printf(1,0) con_vprintf(const char *, va_list);
void __fmt_printf(1,2) con_printf(const char *, ...);

static __always_inline void con_flush(void)
{
    while (!(CON_STATUS & 1))
	/* wait */;
}

static __always_inline void __con_set_baudrate_inline(uint32_t baud)
{
    uint32_t bauddiv;

    /*
     * Produce a CON_BAUD_BITS binary fraction. The +1 produces better
     * rounding behavior: see Hacker's Delight.
     */
    bauddiv = (baud * ((1ULL << (32+CON_BAUD_BITS))/CON_BAUD_BASE+1)) >> 32;

    /*
     * Not really a divisor, but a fractional multiplier. The -1
     * is simply a technicality of the implementation.
     */
    CON_BAUDDIV = bauddiv - 1;
}

static __always_inline void con_set_baudrate(uint32_t baud)
{
    if (__is_constant(baud))
	__con_set_baudrate_inline(baud);
    else
	__con_set_baudrate(baud);
}

#endif /* CONSOLE_H */