147 lines
4.5 KiB
C
147 lines
4.5 KiB
C
/*
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* Copyright (c) 2010, Mariano Alvira <mar@devl.org> and other contributors
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* to the MC1322x project (http://mc1322x.devl.org)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of libmc1322x: see http://mc1322x.devl.org
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* for details.
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*
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*
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*/
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#include <mc1322x.h>
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#include <stdint.h>
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volatile char u2_tx_buf[UART2_TX_BUFFERSIZE];
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volatile uint32_t u2_tx_head, u2_tx_tail;
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#if UART2_RX_BUFFERSIZE > 32
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volatile char u2_rx_buf[UART2_RX_BUFFERSIZE-32];
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volatile uint32_t u2_rx_head, u2_rx_tail;
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#endif
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void uart2_isr(void) {
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#if UART2_RX_BUFFERSIZE > 32
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if (*UART2_USTAT & ( 1 << 6)) { //receive interrupt
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while( *UART2_URXCON != 0 ) { //flush the hardware fifo into the software buffer
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uint32_t u2_rx_tail_next;
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u2_rx_tail_next = u2_rx_tail+1;
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if (u2_rx_tail_next >= sizeof(u2_rx_buf))
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u2_rx_tail_next = 0;
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if (u2_rx_head != u2_rx_tail_next) {
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u2_rx_buf[u2_rx_tail]= *UART2_UDATA;
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u2_rx_tail = u2_rx_tail_next;
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} else { //buffer is full, flush the fifo
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while (*UART2_URXCON !=0) if (*UART2_UDATA);
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}
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}
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return;
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}
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#endif
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while( *UART2_UTXCON != 0 ) {
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if (u2_tx_head == u2_tx_tail) {
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#if UART2_RX_BUFFERSIZE > 32
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*UART2_UCON |= (1 << 13); /*disable tx interrupt */
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#else
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disable_irq(UART2);
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#endif
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return;
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}
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*UART2_UDATA = u2_tx_buf[u2_tx_tail];
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u2_tx_tail++;
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if (u2_tx_tail >= sizeof(u2_tx_buf))
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u2_tx_tail = 0;
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}
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}
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void uart2_putc(char c) {
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/* disable UART2 since */
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/* UART2 isr modifies u2_tx_head and u2_tx_tail */
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#if UART2_RX_BUFFERSIZE > 32
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*UART2_UCON |= (1 << 13); /*disable tx interrupt */
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#else
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disable_irq(UART2);
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#endif
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if( (u2_tx_head == u2_tx_tail) &&
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(*UART2_UTXCON != 0)) {
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*UART2_UDATA = c;
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} else {
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u2_tx_buf[u2_tx_head] = c;
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u2_tx_head += 1;
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if (u2_tx_head >= sizeof(u2_tx_buf))
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u2_tx_head = 0;
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if (u2_tx_head == u2_tx_tail) { /* drop chars when no room */
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#if UART2_DROP_CHARS
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if (u2_tx_head) { u2_tx_head -=1; } else { u2_tx_head = sizeof(u2_tx_buf); }
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#else
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{
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uint32_t u2_tx_tail_save=u2_tx_tail;
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/* Back up head to show buffer not empty, and enable tx interrupt */
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u2_tx_head--;
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#if UART2_RX_BUFFERSIZE > 32
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*UART2_UCON &= ~(1 << 13); /*enable tx interrupt */
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#else
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enable_irq(UART2);
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#endif
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/* Tail will change after one character goes out */
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while (u2_tx_tail_save == u2_tx_tail) ;
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/* Restore head to character we just stuffed */
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u2_tx_head++;
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return;
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}
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#endif /* UART2_DROP_CHARS */
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}
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#if UART2_RX_BUFFERSIZE > 32
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*UART2_UCON &= ~(1 << 13); /*enable tx interrupt */
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#else
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enable_irq(UART2);
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#endif
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}
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}
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uint8_t uart2_getc(void) {
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#if UART2_RX_BUFFERSIZE > 32
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/* First pull from the ram buffer */
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uint8_t c=0;
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if (u2_rx_head != u2_rx_tail) {
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c = u2_rx_buf[u2_rx_head++];
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if (u2_rx_head >= sizeof(u2_rx_buf))
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u2_rx_head=0;
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return c;
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}
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#endif
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/* Then pull from the hardware fifo */
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while(uart2_can_get() == 0) { continue; }
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return *UART2_UDATA;
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}
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