101 lines
3.5 KiB
C
101 lines
3.5 KiB
C
/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos 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; either version 2 of the License, or
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* (at your option) any later version.
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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 Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2010 Develer S.r.l. (http://www.develer.com/)
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*
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* -->
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*
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* \brief SAM3 debug support (implementation).
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*
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* \author Stefano Fedrigo <aleph@develer.com>
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*/
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#include <cfg/cfg_debug.h>
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#include <cfg/macros.h> /* for BV() */
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#include <cpu/types.h>
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#include <io/sam3.h>
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#if (CONFIG_KDEBUG_PORT == 0)
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#define UART_BASE UART0_BASE
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#define UART_ID UART0_ID
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#define UART_PIO_BASE UART0_PORT
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#define UART_PERIPH UART0_PERIPH
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#define UART_PINS (BV(URXD0) | BV(UTXD0))
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#elif (CONFIG_KDEBUG_PORT == 1) && UART_PORTS > 1
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#define UART_BASE UART1_BASE
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#define UART_ID UART1_ID
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#define UART_PIO_BASE UART1_PORT
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#define UART_PERIPH UART1_PERIPH
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#define UART_PINS (BV(URXD1) | BV(UTXD1))
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#else
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#error "UART port not supported in this board"
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#endif
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// TODO: refactor serial simple functions and use them, see lm3s kdebug
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#define KDBG_WAIT_READY() while (!(HWREG(UART_BASE + UART_SR_OFF) & BV(UART_SR_TXRDY))) {}
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#define KDBG_WAIT_TXDONE() while (!(HWREG(UART_BASE + UART_SR_OFF) & BV(UART_SR_TXEMPTY))) {}
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#define KDBG_WRITE_CHAR(c) do { HWREG(UART_BASE + UART_THR_OFF) = (c); } while(0)
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/* Debug unit is used only for debug purposes so does not generate interrupts. */
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#define KDBG_MASK_IRQ(old) do { (void)old; } while(0)
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/* Debug unit is used only for debug purposes so does not generate interrupts. */
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#define KDBG_RESTORE_IRQ(old) do { (void)old; } while(0)
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typedef uint32_t kdbg_irqsave_t;
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INLINE void kdbg_hw_init(void)
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{
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/*
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* Disable PIO mode and set appropriate UART pins peripheral mode.
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* SAM3X,A,N,S,U: all of them has all UARTs on peripheral A.
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*/
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HWREG(UART_PIO_BASE + PIO_PDR_OFF) = UART_PINS;
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PIO_PERIPH_SEL(UART_PIO_BASE, UART_PINS, UART_PERIPH);
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/* Enable the peripheral clock */
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pmc_periphEnable(UART_ID);
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/* Reset and disable receiver & transmitter */
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HWREG(UART_BASE + UART_CR_OFF) = BV(UART_CR_RSTRX) | BV(UART_CR_RSTTX) | BV(UART_CR_RXDIS) | BV(UART_CR_TXDIS);
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/* Set mode: normal, no parity */
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HWREG(UART_BASE + UART_MR_OFF) = UART_MR_PAR_NO;
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/* Set baud rate */
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HWREG(UART_BASE + UART_BRGR_OFF) = CPU_FREQ / CONFIG_KDEBUG_BAUDRATE / 16;
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/* Enable receiver & transmitter */
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HWREG(UART_BASE + UART_CR_OFF) = BV(UART_CR_RXEN) | BV(UART_CR_TXEN);
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}
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