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/*
* (C) Copyright 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 program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*/
#include "config.h"
#include "cpu.h"
#include "system.h"
/* UART 0/1 */
#define CONFIG_UART_BRSR 87
#define MAX_UART_BUFFER 32
static unsigned char uart1buffer[MAX_UART_BUFFER];
int uart1read = 0, uart1write = 0, uart1count = 0;
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 = 0x8000;
/* 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 uartPutc(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 uartPutHex(unsigned int n) {
unsigned int i;
for (i = 8; i != 0; i--) {
unsigned int digit = n >> 28;
uartPutc(digit >= 10 ? digit - 10 + 'A' : digit + '0');
n <<= 4;
}
}
void uartPuts(const char *str) {
char ch;
while ((ch = *str++) != '\0') {
uartPutc(ch);
}
}
void uartGets(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;
// Echo character back
IO_UART1_DTRR=ch;
// 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;
}
}
}
int uartPollch(unsigned int ticks) {
while (ticks--) {
if (IO_UART1_RFCR & 0x3f) {
return IO_UART1_DTRR & 0xff;
}
}
return -1;
}
bool uartAvailable(void)
{
return uart1count > 0;
}
void uart1_heartbeat(void)
{
char data[5] = {0x11, 0x30, 0x11^0x30, 0x11+0x30, '\0'};
uartPuts(data);
}
void uartSendData(char* data, int len)
{
int i;
for(i=0;i<len;i++)
uartPutc(data[i]);
}
bool uart1_getch(char *c)
{
if (uart1count > 0)
{
*c = uart1buffer[uart1read];
uart1read = (uart1read+1) % MAX_UART_BUFFER;
uart1count--;
return true;
}
return false;
}
/* UART1 receive intterupt handler */
void UART1(void)
{
if (IO_UART1_RFCR & 0x3f)
{
if (uart1count >= MAX_UART_BUFFER)
panicf("UART1 buffer overflow");
uart1buffer[uart1write] = IO_UART1_DTRR & 0xff;
uart1write = (uart1write+1) % MAX_UART_BUFFER;
uart1count++;
}
IO_INTC_IRQ0 = (1<<IRQ_UART1);
}
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