mirror of
https://github.com/oliverschmidt/contiki.git
synced 2024-08-29 13:29:09 +00:00
bump libmc1322x to 7bee48243c
Conflicts:
cpu/mc1322x/board/Makefile.board
cpu/mc1322x/lib/include/uart.h
cpu/mc1322x/lib/uart1.c
cpu/mc1322x/lib/uart2.c
cpu/mc1322x/src/default_lowlevel.c
147 lines
4.5 KiB
C
147 lines
4.5 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.
|
|
*
|
|
*
|
|
*/
|
|
|
|
#include <mc1322x.h>
|
|
#include <stdint.h>
|
|
|
|
volatile char u1_tx_buf[UART1_TX_BUFFERSIZE];
|
|
volatile uint32_t u1_tx_head, u1_tx_tail;
|
|
|
|
#if UART1_RX_BUFFERSIZE > 32
|
|
volatile char u1_rx_buf[UART1_RX_BUFFERSIZE-32];
|
|
volatile uint32_t u1_rx_head, u1_rx_tail;
|
|
#endif
|
|
|
|
void uart1_isr(void) {
|
|
|
|
#if UART1_RX_BUFFERSIZE > 32
|
|
if (*UART1_USTAT & ( 1 << 6)) { //receive interrupt
|
|
while( *UART1_URXCON != 0 ) { //flush the hardware fifo into the software buffer
|
|
uint32_t u1_rx_tail_next;
|
|
u1_rx_tail_next = u1_rx_tail+1;
|
|
if (u1_rx_tail_next >= sizeof(u1_rx_buf))
|
|
u1_rx_tail_next = 0;
|
|
if (u1_rx_head != u1_rx_tail_next) {
|
|
u1_rx_buf[u1_rx_tail]= *UART1_UDATA;
|
|
u1_rx_tail = u1_rx_tail_next;
|
|
} else { //buffer is full, flush the fifo
|
|
while (*UART1_URXCON !=0) { if (*UART1_UDATA) { } }
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
while( *UART1_UTXCON != 0 ) {
|
|
if (u1_tx_head == u1_tx_tail) {
|
|
#if UART1_RX_BUFFERSIZE > 32
|
|
*UART1_UCON |= (1 << 13); /*disable tx interrupt */
|
|
#else
|
|
disable_irq(UART1);
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
*UART1_UDATA = u1_tx_buf[u1_tx_tail];
|
|
u1_tx_tail++;
|
|
if (u1_tx_tail >= sizeof(u1_tx_buf))
|
|
u1_tx_tail = 0;
|
|
}
|
|
}
|
|
|
|
void uart1_putc(char c) {
|
|
/* disable UART1 since */
|
|
/* UART1 isr modifies u1_tx_head and u1_tx_tail */
|
|
#if UART1_RX_BUFFERSIZE > 32
|
|
*UART1_UCON |= (1 << 13); /*disable tx interrupt */
|
|
#else
|
|
disable_irq(UART1);
|
|
#endif
|
|
|
|
if( (u1_tx_head == u1_tx_tail) &&
|
|
(*UART1_UTXCON != 0)) {
|
|
*UART1_UDATA = c;
|
|
} else {
|
|
u1_tx_buf[u1_tx_head] = c;
|
|
u1_tx_head += 1;
|
|
if (u1_tx_head >= sizeof(u1_tx_buf))
|
|
u1_tx_head = 0;
|
|
if (u1_tx_head == u1_tx_tail) { /* drop chars when no room */
|
|
#if UART1_DROP_CHARS
|
|
if (u1_tx_head) { u1_tx_head -=1; } else { u1_tx_head = sizeof(u1_tx_buf); }
|
|
#else
|
|
{
|
|
uint32_t u1_tx_tail_save=u1_tx_tail;
|
|
/* Back up head to show buffer not empty, and enable tx interrupt */
|
|
u1_tx_head--;
|
|
#if UART1_RX_BUFFERSIZE > 32
|
|
*UART1_UCON &= ~(1 << 13); /*enable tx interrupt */
|
|
#else
|
|
enable_irq(UART1);
|
|
#endif
|
|
/* Tail will change after one character goes out */
|
|
while (u1_tx_tail_save == u1_tx_tail) ;
|
|
/* Restore head to character we just stuffed */
|
|
u1_tx_head++;
|
|
return;
|
|
}
|
|
#endif /* UART1_DROP_CHARS */
|
|
}
|
|
|
|
#if UART1_RX_BUFFERSIZE > 32
|
|
*UART1_UCON &= ~(1 << 13); /*enable tx interrupt */
|
|
#else
|
|
enable_irq(UART1);
|
|
#endif
|
|
|
|
}
|
|
}
|
|
|
|
uint8_t uart1_getc(void) {
|
|
#if UART1_RX_BUFFERSIZE > 32
|
|
/* First pull from the ram buffer */
|
|
uint8_t c=0;
|
|
if (u1_rx_head != u1_rx_tail) {
|
|
c = u1_rx_buf[u1_rx_head++];
|
|
if (u1_rx_head >= sizeof(u1_rx_buf))
|
|
u1_rx_head=0;
|
|
return c;
|
|
}
|
|
#endif
|
|
/* Then pull from the hardware fifo */
|
|
while(uart1_can_get() == 0) { continue; }
|
|
return *UART1_UDATA;
|
|
}
|