78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
/*
|
|
* Copyright (c) 2010, Mariano Alvira <mar@devl.org> and other contributors
|
|
* to the MC1322x project (http://mc1322x.devl.org)
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* This file is part of libmc1322x: see http://mc1322x.devl.org
|
|
* for details.
|
|
*
|
|
* $Id: uart1.c,v 1.2 2010/07/06 13:39:34 maralvira Exp $
|
|
*/
|
|
|
|
#include <mc1322x.h>
|
|
#include <types.h>
|
|
|
|
volatile char u1_tx_buf[1024];
|
|
volatile uint32_t u1_head, u1_tail;
|
|
|
|
void uart1_isr(void) {
|
|
while( *UART1_UTXCON != 0 ) {
|
|
if (u1_head == u1_tail) {
|
|
disable_irq(UART1);
|
|
return;
|
|
}
|
|
*UART1_UDATA = u1_tx_buf[u1_tail];
|
|
u1_tail++;
|
|
if (u1_tail >= sizeof(u1_tx_buf))
|
|
u1_tail = 0;
|
|
}
|
|
}
|
|
|
|
void uart1_putc(char c) {
|
|
/* disable UART1 since */
|
|
/* UART1 isr modifies u1_head and u1_tail */
|
|
disable_irq(UART1);
|
|
|
|
if( (u1_head == u1_tail) &&
|
|
(*UART1_UTXCON != 0)) {
|
|
*UART1_UDATA = c;
|
|
} else {
|
|
u1_tx_buf[u1_head] = c;
|
|
u1_head += 1;
|
|
if (u1_head >= sizeof(u1_tx_buf))
|
|
u1_head = 0;
|
|
if (u1_head == u1_tail) { /* drop chars when no room */
|
|
if (u1_head) { u1_head -=1; } else { u1_head = sizeof(u1_tx_buf); }
|
|
}
|
|
enable_irq(UART1);
|
|
}
|
|
}
|
|
|
|
uint8_t uart1_getc(void) {
|
|
while(uart1_can_get() == 0) { continue; }
|
|
return *UART1_UDATA;
|
|
}
|