git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@1099 35acf78f-673a-0410-8e92-d51de3d6d3f4
gdisirio
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/*
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ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT 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 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT 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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file AT91SAM7X/sam7x_serial.c
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* @brief AT91SAM7X Serial driver code.
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* @addtogroup AT91SAM7X_SERIAL
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* @{
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*/
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#include <ch.h>
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#include "board.h"
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#include "sam7x_serial.h"
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#include "at91lib/aic.h"
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#if USE_SAM7X_USART0 || defined(__DOXYGEN__)
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/** @brief USART0 serial driver identifier.*/
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FullDuplexDriver COM1;
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static uint8_t ib1[SERIAL_BUFFERS_SIZE];
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static uint8_t ob1[SERIAL_BUFFERS_SIZE];
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#endif
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#if USE_SAM7X_USART1 || defined(__DOXYGEN__)
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/** @brief USART1 serial driver identifier.*/
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FullDuplexDriver COM2;
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static uint8_t ib2[SERIAL_BUFFERS_SIZE];
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static uint8_t ob2[SERIAL_BUFFERS_SIZE];
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#endif
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static void SetError(AT91_REG csr, FullDuplexDriver *com) {
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dflags_t sts = 0;
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if (csr & AT91C_US_OVRE)
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sts |= SD_OVERRUN_ERROR;
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if (csr & AT91C_US_PARE)
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sts |= SD_PARITY_ERROR;
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if (csr & AT91C_US_FRAME)
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sts |= SD_FRAMING_ERROR;
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if (csr & AT91C_US_RXBRK)
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sts |= SD_BREAK_DETECTED;
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chSysLockFromIsr();
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chFDDAddFlagsI(com, sts);
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chSysUnlockFromIsr();
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}
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/** @cond never*/
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__attribute__((noinline))
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/** @endcond*/
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/**
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* @brief Common IRQ handler.
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* @param[in] u pointer to an USART I/O block
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* @param[in] com communication channel associated to the USART
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*/
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static void ServeInterrupt(AT91PS_USART u, FullDuplexDriver *com) {
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if (u->US_CSR & AT91C_US_RXRDY) {
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chSysLockFromIsr();
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chFDDIncomingDataI(com, u->US_RHR);
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chSysUnlockFromIsr();
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}
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if (u->US_CSR & AT91C_US_TXRDY) {
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chSysLockFromIsr();
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msg_t b = chFDDRequestDataI(com);
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chSysUnlockFromIsr();
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if (b < Q_OK)
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u->US_IDR = AT91C_US_TXRDY;
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else
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u->US_THR = b;
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}
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if (u->US_CSR & (AT91C_US_OVRE | AT91C_US_FRAME | AT91C_US_PARE | AT91C_US_RXBRK)) {
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SetError(u->US_CSR, com);
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u->US_CR = AT91C_US_RSTSTA;
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}
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AT91C_BASE_AIC->AIC_EOICR = 0;
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}
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#if USE_SAM7X_USART0 || defined(__DOXYGEN__)
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CH_IRQ_HANDLER(USART0IrqHandler) {
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CH_IRQ_PROLOGUE();
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ServeInterrupt(AT91C_BASE_US0, &COM1);
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CH_IRQ_EPILOGUE();
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}
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static void OutNotify1(void) {
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AT91C_BASE_US0->US_IER = AT91C_US_TXRDY;
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}
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#endif
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#if USE_SAM7X_USART1 || defined(__DOXYGEN__)
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CH_IRQ_HANDLER(USART1IrqHandler) {
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CH_IRQ_PROLOGUE();
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ServeInterrupt(AT91C_BASE_US1, &COM2);
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CH_IRQ_EPILOGUE();
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}
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static void OutNotify2(void) {
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AT91C_BASE_US1->US_IER = AT91C_US_TXRDY;
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}
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#endif
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/**
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* @brief USART setup.
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* @param[in] u pointer to an UART I/O block
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* @param[in] speed serial port speed in bits per second
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* @param[in] mr the value for the @p MR register
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* @note Must be invoked with interrupts disabled.
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* @note Does not reset the I/O queues.
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*/
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void usart_setup(AT91PS_USART u, int speed, int mr) {
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/* Disables IRQ sources and stop operations.*/
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u->US_IDR = 0xFFFFFFFF;
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u->US_CR = AT91C_US_RSTRX | AT91C_US_RSTTX | AT91C_US_RSTSTA;
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/* New parameters setup.*/
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if (mr & AT91C_US_OVER)
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u->US_BRGR = MCK / (speed * 8);
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else
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u->US_BRGR = MCK / (speed * 16);
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u->US_MR = mr;
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u->US_RTOR = 0;
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u->US_TTGR = 0;
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/* Enables operations and IRQ sources.*/
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u->US_CR = AT91C_US_RXEN | AT91C_US_TXEN | AT91C_US_DTREN | AT91C_US_RTSEN;
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u->US_IER = AT91C_US_RXRDY | AT91C_US_OVRE | AT91C_US_FRAME | AT91C_US_PARE |
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AT91C_US_RXBRK;
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}
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/**
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* @brief Serial driver initialization.
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* @param[in] prio0 priority to be assigned to the USART1 IRQ
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* @param[in] prio1 priority to be assigned to the USART2 IRQ
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* @note Handshake pads are not enabled inside this function because they
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* may have another use, enable them externally if needed.
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* RX and TX pads are handled inside.
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*/
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void serial_init(int prio0, int prio1) {
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#if USE_SAM7X_USART0 || defined(__DOXYGEN__)
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/* I/O queue setup.*/
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chFDDInit(&COM1, ib1, sizeof ib1, NULL, ob1, sizeof ob1, OutNotify1);
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/* Switches the I/O pins to the peripheral function A, disables pullups.*/
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AT91C_BASE_PIOA->PIO_PDR = AT91C_PA0_RXD0 | AT91C_PA1_TXD0;
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AT91C_BASE_PIOA->PIO_ASR = AT91C_PIO_PA0 | AT91C_PIO_PA1;
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AT91C_BASE_PIOA->PIO_PPUDR = AT91C_PIO_PA0 | AT91C_PIO_PA1;
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/* Starts the clock and clears possible sources of immediate interrupts.*/
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AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_US0);
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AT91C_BASE_US0->US_CR = AT91C_US_RSTRX | AT91C_US_RSTTX | AT91C_US_RSTSTA;
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/* Interrupts setup.*/
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AIC_ConfigureIT(AT91C_ID_US0,
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AT91C_AIC_SRCTYPE_HIGH_LEVEL | prio0,
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USART0IrqHandler);
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AIC_EnableIT(AT91C_ID_US0);
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/* Default parameters.*/
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usart_setup(AT91C_BASE_US0, DEFAULT_USART_BITRATE,
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AT91C_US_USMODE_NORMAL |
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AT91C_US_CLKS_CLOCK |
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AT91C_US_CHRL_8_BITS |
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AT91C_US_PAR_NONE |
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AT91C_US_NBSTOP_1_BIT);
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#endif
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#if USE_SAM7X_USART1 || defined(__DOXYGEN__)
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/* I/O queues setup.*/
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chFDDInit(&COM2, ib2, sizeof ib2, NULL, ob2, sizeof ob2, OutNotify2);
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/* Switches the I/O pins to the peripheral function A, disables pullups.*/
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AT91C_BASE_PIOA->PIO_PDR = AT91C_PA5_RXD1 | AT91C_PA6_TXD1;
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AT91C_BASE_PIOA->PIO_ASR = AT91C_PIO_PA5 | AT91C_PIO_PA6;
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AT91C_BASE_PIOA->PIO_PPUDR = AT91C_PIO_PA5 | AT91C_PIO_PA6;
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/* Starts the clock and clears possible sources of immediate interrupts.*/
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AT91C_BASE_PMC->PMC_PCER = (1 << AT91C_ID_US1);
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AT91C_BASE_US1->US_CR = AT91C_US_RSTRX | AT91C_US_RSTTX | AT91C_US_RSTSTA;
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/* Interrupts setup.*/
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AIC_ConfigureIT(AT91C_ID_US1,
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AT91C_AIC_SRCTYPE_HIGH_LEVEL | prio1,
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USART1IrqHandler);
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AIC_EnableIT(AT91C_ID_US1);
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/* Default parameters.*/
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usart_setup(AT91C_BASE_US1, DEFAULT_USART_BITRATE,
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AT91C_US_USMODE_NORMAL |
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AT91C_US_CLKS_CLOCK |
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AT91C_US_CHRL_8_BITS |
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AT91C_US_PAR_NONE |
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AT91C_US_NBSTOP_1_BIT);
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#endif
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}
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/** @} */
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@ -1,86 +0,0 @@
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/*
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ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT 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 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT 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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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file AT91SAM7X/sam7x_serial.h
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* @brief AT91SAM7X Serial driver macros and structures.
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* @addtogroup AT91SAM7X_SERIAL
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* @{
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*/
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#ifndef _SAM7X_SERIAL_H_
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#define _SAM7X_SERIAL_H_
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/**
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* @brief Serial buffers size.
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* @details Configuration parameter, you can change the depth of the queue
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* buffers depending on the requirements of your application.
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* @note The default is 128 bytes for both the transmission and receive buffers.
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*/
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#if !defined(SERIAL_BUFFERS_SIZE) || defined(__DOXYGEN__)
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#define SERIAL_BUFFERS_SIZE 128
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#endif
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/**
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* @brief Default bit rate.
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* @details Configuration parameter, at startup the UARTs are configured at
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* this speed.
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* @note It is possible to use @p SetUART() in order to change the working
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* parameters at runtime.
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*/
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#if !defined(DEFAULT_USART_BITRATE) || defined(__DOXYGEN__)
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#define DEFAULT_USART_BITRATE 38400
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#endif
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/**
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* @brief UART0 driver enable switch.
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* @details If set to @p TRUE the support for USART1 is included.
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* @note The default is @p TRUE.
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*/
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#if !defined(USE_SAM7X_USART0) || defined(__DOXYGEN__)
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#define USE_SAM7X_USART0 TRUE
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#endif
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/**
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* @brief UART1 driver enable switch.
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* @details If set to @p TRUE the support for USART2 is included.
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* @note The default is @p TRUE.
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*/
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#if !defined(USE_SAM7X_USART1) || defined(__DOXYGEN__)
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#define USE_SAM7X_USART1 TRUE
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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void serial_init(int prio0, int prio1);
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void usart_setup(AT91PS_USART u, int speed, int mr);
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CH_IRQ_HANDLER(UART0IrqHandler);
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CH_IRQ_HANDLER(UART1IrqHandler);
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#ifdef __cplusplus
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}
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#endif
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/** @cond never*/
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extern FullDuplexDriver COM1, COM2;
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/** @endcond*/
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#endif /* _SAM7X_SERIAL_H_ */
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/** @} */
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