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64 lines
1.4 KiB
C
64 lines
1.4 KiB
C
/*
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* uart0.c - Implementation of the uart.
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* Copyright (C) 2013 Milan Babel <babel@inf.fu-berlin.de>
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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#include <stdio.h>
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#include "board.h"
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#define UART0_TX U0TXBUF
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#define UART0_WAIT_TXDONE() while( (U0TCTL & TXEPT) == 0 ) { _NOP(); }
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#include "kernel.h"
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#include "board_uart0.h"
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int putchar(int c)
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{
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UART0_TX = c;
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UART0_WAIT_TXDONE();
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if (c == 10) {
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UART0_TX = 13;
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UART0_WAIT_TXDONE();
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}
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return c;
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}
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void usart0irq(void);
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/**
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* \brief the interrupt function
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*/
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interrupt(USART0RX_VECTOR) usart0irq(void) {
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int dummy = 0;
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/* Check status register for receive errors. */
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if(U0RCTL & RXERR) {
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if (U0RCTL & FE) {
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puts("rx framing error");
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}
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if (U0RCTL & OE) {
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puts("rx overrun error");
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}
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if (U0RCTL & PE) {
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puts("rx parity error");
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}
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if (U0RCTL & BRK) {
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puts("rx break error");
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}
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/* Clear error flags by forcing a dummy read. */
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dummy = U0RXBUF;
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}
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#ifdef MODULE_UART0
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else if (uart0_handler_pid != KERNEL_PID_UNDEF) {
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dummy = U0RXBUF;
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uart0_handle_incoming(dummy);
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uart0_notify_thread();
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}
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#endif
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}
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