81 lines
2.9 KiB
C
81 lines
2.9 KiB
C
/***************************************************************************
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* sam7fc - Debug Unit RS232 Port *
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* *
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* Copyright (C) 01/2008 by Olaf Rempel *
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* razzor@kopf-tisch.de *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; version 2 of the License *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#include <stdint.h>
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#include <string.h>
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#include "AT91SAM7S256.h"
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#include "board.h"
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#include "at91_dbgu.h"
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#include "at91_sysc.h"
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#include "fifo.h"
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#define DBGU_BAUDRATE 115200
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#define DBGU_FIFO_SIZE 1024
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#define DBGU_TX_CHUNKS 16
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static struct fifo *txfifo;
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static void dbgu_isr(uint32_t status)
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{
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/* only enabled interrupts */
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status &= *AT91C_DBGU_IMR;
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if (status & AT91C_US_TXBUFE)
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if (fifo_txpdc(txfifo, AT91C_BASE_PDC_DBGU, DBGU_TX_CHUNKS) == 0)
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*AT91C_DBGU_IDR = AT91C_US_TXBUFE;
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}
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void at91_dbgu_init(void)
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{
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/* switch pins to UART */
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*AT91C_PIOA_PDR = AT91C_PA9_DRXD | AT91C_PA10_DTXD;
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/* enable Debug Port with 115200 Baud (+0.16%) */
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AT91S_DBGU *dbgu = AT91C_BASE_DBGU;
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dbgu->DBGU_BRGR = BAUD_TO_DIV(DBGU_BAUDRATE);
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dbgu->DBGU_MR = AT91C_US_PAR_NONE | AT91C_US_CHMODE_NORMAL;
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dbgu->DBGU_CR = AT91C_US_RXEN | AT91C_US_TXEN | AT91C_US_RSTSTA;
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txfifo = fifo_alloc(DBGU_FIFO_SIZE);
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/* enable TX PDC */
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dbgu->DBGU_PTCR = AT91C_PDC_TXTEN;
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sysc_register_isr(AT91_SYSIRQ_DBGU, dbgu_isr);
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}
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void at91_dbgu_putc(char c)
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{
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fifo_putbyte(txfifo, c);
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*AT91C_DBGU_IER = AT91C_US_TXBUFE;
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}
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void at91_dbgu_puts(const char *p)
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{
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fifo_put(txfifo, (char *)p, strlen(p));
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*AT91C_DBGU_IER = AT91C_US_TXBUFE;
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}
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int at91_dbgu_write(void *base, const char *buf, size_t len)
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{
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int retval = fifo_put(txfifo, (char *)buf, len);
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*AT91C_DBGU_IER = AT91C_US_TXBUFE;
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return retval;
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}
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