379 lines
8.9 KiB
C
379 lines
8.9 KiB
C
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/*
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ChibiOS/RT - Copyright (C) 2006-2014 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file AVR/serial_lld.c
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* @brief AVR low level serial driver code.
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*
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* @addtogroup SERIAL
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* @{
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*/
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#include "hal.h"
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#if HAL_USE_SERIAL || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/**
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* @brief USART0 serial driver identifier.
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* @note The name does not follow the convention used in the other ports
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* (COMn) because a name conflict with the AVR headers.
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*/
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#if AVR_SERIAL_USE_USART0 || defined(__DOXYGEN__)
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SerialDriver SD1;
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/* USARTs are not consistently named across the AVR range */
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#ifdef USART0_RX_vect
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#define AVR_SD1_RX_VECT USART0_RX_vect
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#define AVR_SD1_TX_VECT USART0_UDRE_vect
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#elif defined(USART_RX_vect)
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#define AVR_SD1_RX_VECT USART_RX_vect
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#define AVR_SD1_TX_VECT USART_UDRE_vect
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#else
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#error "Cannot find USART to use for SD1"
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#endif
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#endif /* AVR_SERIAL_USE_USART0 */
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/**
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* @brief USART1 serial driver identifier.
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* @note The name does not follow the convention used in the other ports
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* (COMn) because a name conflict with the AVR headers.
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*/
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#if AVR_SERIAL_USE_USART1 || defined(__DOXYGEN__)
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SerialDriver SD2;
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/* Check if USART1 exists for this MCU */
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#ifdef USART1_RX_vect
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#define AVR_SD2_RX_VECT USART1_RX_vect
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#define AVR_SD2_TX_VECT USART1_UDRE_vect
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#else
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#error "Cannot find USART to use for SD2"
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#endif
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#endif /* AVR_SERIAL_USE_USART1 */
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/*===========================================================================*/
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/* Driver local variables and types. */
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/*===========================================================================*/
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/**
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* @brief Driver default configuration.
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*/
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static const SerialConfig default_config = {
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UBRR(SERIAL_DEFAULT_BITRATE),
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USART_CHAR_SIZE_8
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};
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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static void set_error(uint8_t sra, SerialDriver *sdp) {
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eventflags_t sts = 0;
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uint8_t dor = 0;
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uint8_t upe = 0;
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uint8_t fe = 0;
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#if AVR_SERIAL_USE_USART0
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if (&SD1 == sdp) {
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dor = (1 << DOR0);
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upe = (1 << UPE0);
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fe = (1 << FE0);
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}
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#endif
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#if AVR_SERIAL_USE_USART1
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if (&SD2 == sdp) {
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dor = (1 << DOR1);
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upe = (1 << UPE1);
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fe = (1 << FE1);
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}
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#endif
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if (sra & dor)
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sts |= SD_OVERRUN_ERROR;
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if (sra & upe)
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sts |= SD_PARITY_ERROR;
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if (sra & fe)
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sts |= SD_FRAMING_ERROR;
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osalSysLockFromISR();
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chnAddFlagsI(sdp, sts);
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osalSysUnlockFromISR();
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}
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#if AVR_SERIAL_USE_USART0 || defined(__DOXYGEN__)
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static void notify1(GenericQueue *qp) {
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(void)qp;
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UCSR0B |= (1 << UDRIE0);
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}
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/**
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* @brief USART0 initialization.
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*
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* @param[in] config the architecture-dependent serial driver configuration
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*/
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static void usart0_init(const SerialConfig *config) {
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UBRR0L = config->sc_brr;
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UBRR0H = config->sc_brr >> 8;
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UCSR0A = 0;
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UCSR0B = (1 << RXEN0) | (1 << TXEN0) | (1 << RXCIE0);
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switch (config->sc_bits_per_char) {
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case USART_CHAR_SIZE_5:
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UCSR0C = 0;
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break;
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case USART_CHAR_SIZE_6:
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UCSR0C = (1 << UCSZ00);
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break;
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case USART_CHAR_SIZE_7:
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UCSR0C = (1 << UCSZ01);
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break;
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case USART_CHAR_SIZE_9:
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UCSR0B |= (1 << UCSZ02);
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UCSR0C = (1 << UCSZ00) | (1 << UCSZ01);
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break;
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case USART_CHAR_SIZE_8:
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default:
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UCSR0C = (1 << UCSZ00) | (1 << UCSZ01);
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}
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}
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/**
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* @brief USART0 de-initialization.
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*/
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static void usart0_deinit(void) {
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UCSR0A = 0;
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UCSR0B = 0;
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UCSR0C = 0;
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}
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#endif
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#if AVR_SERIAL_USE_USART1 || defined(__DOXYGEN__)
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static void notify2(GenericQueue *qp) {
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(void)qp;
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UCSR1B |= (1 << UDRIE1);
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}
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/**
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* @brief USART1 initialization.
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*
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* @param[in] config the architecture-dependent serial driver configuration
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*/
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static void usart1_init(const SerialConfig *config) {
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UBRR1L = config->sc_brr;
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UBRR1H = config->sc_brr >> 8;
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UCSR1A = 0;
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UCSR1B = (1 << RXEN1) | (1 << TXEN1) | (1 << RXCIE1);
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switch (config->sc_bits_per_char) {
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case USART_CHAR_SIZE_5:
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UCSR1C = 0;
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break;
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case USART_CHAR_SIZE_6:
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UCSR1C = (1 << UCSZ10);
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break;
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case USART_CHAR_SIZE_7:
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UCSR1C = (1 << UCSZ11);
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break;
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case USART_CHAR_SIZE_9:
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UCSR1B |= (1 << UCSZ12);
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UCSR1C = (1 << UCSZ10) | (1 << UCSZ11);
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break;
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case USART_CHAR_SIZE_8:
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default:
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UCSR1C = (1 << UCSZ10) | (1 << UCSZ11);
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}
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}
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/**
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* @brief USART1 de-initialization.
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*/
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static void usart1_deinit(void) {
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UCSR1A = 0;
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UCSR1B = 0;
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UCSR1C = 0;
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}
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#endif
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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#if AVR_SERIAL_USE_USART0 || defined(__DOXYGEN__)
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/**
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* @brief USART0 RX interrupt handler.
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(AVR_SD1_RX_VECT) {
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uint8_t sra;
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OSAL_IRQ_PROLOGUE();
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sra = UCSR0A;
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if (sra & ((1 << DOR0) | (1 << UPE0) | (1 << FE0)))
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set_error(sra, &SD1);
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osalSysLockFromISR();
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sdIncomingDataI(&SD1, UDR0);
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osalSysUnlockFromISR();
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OSAL_IRQ_EPILOGUE();
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}
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/**
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* @brief USART0 TX interrupt handler.
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(AVR_SD1_TX_VECT) {
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msg_t b;
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OSAL_IRQ_PROLOGUE();
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osalSysLockFromISR();
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b = sdRequestDataI(&SD1);
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osalSysUnlockFromISR();
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if (b < Q_OK)
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UCSR0B &= ~(1 << UDRIE0);
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else
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UDR0 = b;
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OSAL_IRQ_EPILOGUE();
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}
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#endif /* AVR_SERIAL_USE_USART0 */
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#if AVR_SERIAL_USE_USART1 || defined(__DOXYGEN__)
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/**
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* @brief USART1 RX interrupt handler.
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(AVR_SD2_RX_VECT) {
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uint8_t sra;
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OSAL_IRQ_PROLOGUE();
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sra = UCSR1A;
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if (sra & ((1 << DOR1) | (1 << UPE1) | (1 << FE1)))
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set_error(sra, &SD2);
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osalSysLockFromISR();
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sdIncomingDataI(&SD2, UDR1);
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osalSysUnlockFromISR();
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OSAL_IRQ_EPILOGUE();
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}
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/**
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* @brief USART1 TX interrupt handler.
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*
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* @isr
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*/
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OSAL_IRQ_HANDLER(AVR_SD2_TX_VECT) {
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msg_t b;
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OSAL_IRQ_PROLOGUE();
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osalSysLockFromISR();
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b = sdRequestDataI(&SD2);
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osalSysUnlockFromISR();
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if (b < Q_OK)
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UCSR1B &= ~(1 << UDRIE1);
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else
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UDR1 = b;
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OSAL_IRQ_EPILOGUE();
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}
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#endif /* AVR_SERIAL_USE_USART1 */
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level serial driver initialization.
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*
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* @notapi
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*/
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void sd_lld_init(void) {
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#if AVR_SERIAL_USE_USART0
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sdObjectInit(&SD1, NULL, notify1);
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#endif
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#if AVR_SERIAL_USE_USART1
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sdObjectInit(&SD2, NULL, notify2);
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#endif
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}
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/**
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* @brief Low level serial driver configuration and (re)start.
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*
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* @param[in] sdp pointer to a @p SerialDriver object
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* @param[in] config the architecture-dependent serial driver configuration.
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* If this parameter is set to @p NULL then a default
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* configuration is used.
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*
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* @notapi
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*/
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void sd_lld_start(SerialDriver *sdp, const SerialConfig *config) {
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if (config == NULL)
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config = &default_config;
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#if AVR_SERIAL_USE_USART0
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if (&SD1 == sdp) {
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usart0_init(config);
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return;
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}
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#endif
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#if AVR_SERIAL_USE_USART1
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if (&SD2 == sdp) {
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usart1_init(config);
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return;
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}
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#endif
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}
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/**
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* @brief Low level serial driver stop.
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* @details De-initializes the USART, stops the associated clock, resets the
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* interrupt vector.
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*
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* @param[in] sdp pointer to a @p SerialDriver object
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*
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* @notapi
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*/
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void sd_lld_stop(SerialDriver *sdp) {
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#if AVR_SERIAL_USE_USART0
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if (&SD1 == sdp)
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usart0_deinit();
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#endif
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#if AVR_SERIAL_USE_USART1
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if (&SD2 == sdp)
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usart1_deinit();
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#endif
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}
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#endif /* HAL_USE_SERIAL */
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/** @} */
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