ser_simple_avr.c

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#warning FIXME:This module is obsolete, yuo must refactor it.

#if 0
#include "ser_simple_avr.h"

#include <cfg/compiler.h>
#include <appconfig.h>
#include <cfg/macros.h> /* BV() */
#include <hw/hw_cpufreq.h>

#include <avr/io.h>

int _ser_putchar(int c)
{
    /* Disable Rx to avoid echo*/
    UCSR0B &= ~BV(RXEN);
    /* Enable tx*/
    UCSR0B |= BV(TXEN);
    /* Prepare transmission */
    UDR0 = c;
    /* Wait until byte sent */
    while (!(UCSR0A & BV(TXC))) {}
    /* Disable tx to avoid short circuit when tx and rx share the same wire. */
    UCSR0B &= ~BV(TXEN);
    /* Enable Rx */
    UCSR0B |= BV(RXEN);
    /* Delete TRANSMIT_COMPLETE_BIT flag */
    UCSR0A |= BV(TXC);
    return c;
}


int _ser_getchar(void)
{
    /* Wait for data */
    while (!(UCSR0A & BV(RXC))) {}
    return UDR0;

}


int _ser_getchar_nowait(void)
{
    if (!(UCSR0A & BV(RXC))) return EOF;
    else return UDR0;
}

void _ser_settimeouts(void)
{
}

void _ser_setbaudrate(unsigned long rate)
{
    /* Compute baud-rate period */
    uint16_t period = DIV_ROUND(CPU_FREQ / 16UL, rate) - 1;

    UBRR0H = (period) >> 8;
    UBRR0L = (period);
}

int _ser_print(const char *s)
{
    while(*s) _ser_putchar(*s++);
    return 0;
}


void _ser_setparity(int parity)
{
    /* Set the new parity */
    UCSR0C |= (UCSR0C & ~(BV(UPM1) | BV(UPM0))) | (parity << UPM0); 
}

void _ser_purge(void)
{
    while (_ser_getchar_nowait() != EOF) {}
}

struct Serial * _ser_open(void)
{
    /*
     * Set Rx and Tx pins as input to avoid short
     * circuit when serial is disabled.
     */
    DDRE  &= ~(BV(PE0)|BV(PE1));
    PORTE &= ~BV(PE0);
    PORTE |=  BV(PE1);
    /* Enable only Rx section */
    UCSR0B = BV(RXEN);
    return NULL;
}


void _ser_close(void)
{
    /* Disable Rx & Tx. */
    UCSR0B &= ~(BV(RXEN) | BV(TXEN));
}

#endif