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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 Catalin Patulea <cat@vv.carleton.ca>
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* 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"
/* UART 0/1 */
#define CONFIG_UART_BRSR 87
#define MAX_UART_BUFFER 31
unsigned char uart1buffer[MAX_UART_BUFFER];
int uart1read = 0, uart1write = 0, uart1count = 0;
/*
static void do_checksums(char *data, int len, char *xor, char *add)
{
int i;
*xor = data[0];
*add = data[0];
for(i=1;i<len;i++)
{
*xor ^= data[i];
*add += data[i];
}
}
*/
void uart_init(void)
{
// 8-N-1
IO_UART1_MSR=0x8000;
IO_UART1_BRSR=CONFIG_UART_BRSR;
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 */
uart1read = 0;
uart1write = 0;
uart1count = 0;
/* Enable the interrupt */
IO_INTC_EINT0 |= (1<<IRQ_UART1);
}
void uart1_putc(char ch)
{
/* Wait for room in FIFO */
while ((IO_UART1_TFCR & 0x3f) >= 0x20);
/* Write character */
IO_UART1_DTRR=ch;
}
/* Unsigned integer to ASCII hexadecimal conversion */
void uart1_putHex(unsigned int n)
{
unsigned int i;
for (i = 8; i != 0; i--) {
unsigned int digit = n >> 28;
uart1_putc(digit >= 10 ? digit - 10 + 'A' : digit + '0');
n <<= 4;
}
}
void uart1_puts(const char *str)
{
char ch;
while ((ch = *str++) != '\0') {
uart1_putc(ch);
}
}
void uart1_gets(char *str, unsigned int size)
{
for (;;) {
char ch;
/* Wait for FIFO to contain something */
while ((IO_UART1_RFCR & 0x3f) == 0);
/* Read character */
ch = (char)IO_UART1_DTRR;
/* If CR, also echo LF, null-terminate, and return */
if (ch == '\r') {
IO_UART1_DTRR='\n';
if (size) {
*str++ = '\0';
}
return;
}
/* Append to buffer */
if (size) {
*str++ = ch;
--size;
}
}
}
bool uart1_getch(char *c)
{
if (uart1count > 0)
{
if(uart1read>MAX_UART_BUFFER)
uart1read=0;
*c = uart1buffer[uart1read++];
uart1count--;
return true;
}
return false;
}
/* UART1 receive intterupt handler */
void UART1(void)
{
while (IO_UART1_RFCR & 0x3f)
{
if (uart1count > MAX_UART_BUFFER)
panicf("UART1 buffer overflow");
else
{
if(uart1write>MAX_UART_BUFFER)
uart1write=0;
uart1buffer[uart1write++] = IO_UART1_DTRR & 0xff;
uart1count++;
}
}
IO_INTC_IRQ0 = (1<<IRQ_UART1);
}
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