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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 Catalin Patulea <cat@vv.carleton.ca>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "cpu.h"
#include "system.h"
#include "string.h"
#include "panic.h"
#define MAX_UART_BUFFER 31
#define SEND_RING_SIZE 256
#define RECIEVE_RING_SIZE 20
char
// uart1_send_buffer_ring[SEND_RING_SIZE],
uart1_recieve_buffer_ring[RECIEVE_RING_SIZE];
//static unsigned int uart1_send_count, uart1_send_read, uart1_send_write;
static unsigned int uart1_recieve_count, uart1_recieve_read, uart1_recieve_write;
void uart_init(void)
{
// 8-N-1
IO_UART1_MSR=0x8000;
IO_UART1_BRSR=0x0057;
IO_UART1_RFCR = 0x8010; /* Trigger later */
/* gio 27 is input, uart1 rx
gio 28 is output, uart1 tx */
IO_GIO_DIR1 |= (1<<11); /* gio 27 */
IO_GIO_DIR1 &= ~(1<<12); /* gio 28 */
/* init the recieve buffer */
uart1_recieve_count=0;
uart1_recieve_read=0;
uart1_recieve_write=0;
/* Enable the interrupt */
IO_INTC_EINT0 |= INTR_EINT0_UART1;
}
void uart1_putc(char ch)
{
/* Wait for room in FIFO */
while ((IO_UART1_TFCR & 0x3f) >= 0x20);
/* Write character */
IO_UART1_DTRR=ch;
}
void uart1_puts(const char *str, int size)
{
int count=0;
while (count<size)
{
uart1_putc(str[count]);
count++;
}
}
/* This function returns the number of bytes left in the queue after a read is done (negative if fail)*/
int uart1_gets_queue(char *str, unsigned int size)
{
IO_INTC_EINT0 &= ~INTR_EINT0_UART1;
int retval;
if(uart1_recieve_count<size)
{
retval= -1;
}
else
{
if(uart1_recieve_read+size<RECIEVE_RING_SIZE)
{
memcpy(str,uart1_recieve_buffer_ring+uart1_recieve_read,size);
}
else
{
int tempcount=(RECIEVE_RING_SIZE-uart1_recieve_read);
memcpy(str,uart1_recieve_buffer_ring+uart1_recieve_read,tempcount);
memcpy(str+tempcount,uart1_recieve_buffer_ring,size-tempcount);
}
uart1_recieve_count-=size;
if(uart1_recieve_read+size<RECIEVE_RING_SIZE)
uart1_recieve_read+=size;
else
uart1_recieve_read=size-(RECIEVE_RING_SIZE-uart1_recieve_read);
retval=uart1_recieve_count;
}
/* Enable the interrupt */
IO_INTC_EINT0 |= INTR_EINT0_UART1;
return retval;
}
/* UART1 receive interupt handler */
void UART1(void)
{
while (IO_UART1_RFCR & 0x3f)
{
if (uart1_recieve_count > RECIEVE_RING_SIZE)
panicf("UART1 buffer overflow");
else
{
if(uart1_recieve_write==RECIEVE_RING_SIZE)
uart1_recieve_write=0;
uart1_recieve_buffer_ring[uart1_recieve_write] = IO_UART1_DTRR & 0xff;
uart1_recieve_write++;
uart1_recieve_count++;
}
}
IO_INTC_IRQ0 = INTR_IRQ0_UART1;
}
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