New Contiki port to STM32W108.
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cpu/stm32w108/dev/uart1.c
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cpu/stm32w108/dev/uart1.c
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/*
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* Copyright (c) 2010, STMicroelectronics.
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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
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* 3. The name of the author may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* This file is part of the Contiki OS
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*
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \file
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* Machine dependent STM32W UART1 code.
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* \author
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* Salvatore Pitrulli
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* \version
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* 0.1
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* \since
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* 03.04.2010
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*/
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/*---------------------------------------------------------------------------*/
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#include <stdio.h>
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#include <stdlib.h>
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//#include <io.h>
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//#include <signal.h>
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#include "sys/energest.h"
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#include "dev/uart1.h"
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#include "dev/watchdog.h"
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#include "lib/ringbuf.h"
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#include "dev/leds.h"
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static int (*uart1_input_handler)(unsigned char c);
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static volatile uint8_t transmitting;
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#ifdef UART1_CONF_TX_WITH_INTERRUPT
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#define TX_WITH_INTERRUPT UART1_CONF_TX_WITH_INTERRUPT
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#else /* UART1_CONF_TX_WITH_INTERRUPT */
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#define TX_WITH_INTERRUPT 1
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#endif /* UART1_CONF_TX_WITH_INTERRUPT */
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#if TX_WITH_INTERRUPT
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#ifdef UART1_CONF_TX_BUFSIZE
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#define UART1_TX_BUFSIZE UART1_CONF_TX_BUFSIZE
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#else /* UART1_CONF_TX_BUFSIZE */
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#define UART1_TX_BUFSIZE 64
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#endif /* UART1_CONF_TX_BUFSIZE */
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static struct ringbuf txbuf;
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static uint8_t txbuf_data[UART1_TX_BUFSIZE];
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#endif /* TX_WITH_INTERRUPT */
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/*---------------------------------------------------------------------------*/
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//uint8_t
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//uart1_active(void)
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//{
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// return ((~ UTCTL1) & TXEPT) | transmitting;
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//}
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/*---------------------------------------------------------------------------*/
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void
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uart1_set_input(int (*input)(unsigned char c))
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{
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uart1_input_handler = input;
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}
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/*---------------------------------------------------------------------------*/
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void
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uart1_writeb(unsigned char c)
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{
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watchdog_periodic();
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#if TX_WITH_INTERRUPT
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/* Put the outgoing byte on the transmission buffer. If the buffer
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is full, we just keep on trying to put the byte into the buffer
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until it is possible to put it there. */
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while(ringbuf_put(&txbuf, c) == 0);
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/* If there is no transmission going, we need to start it by putting
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the first byte into the UART. */
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if(transmitting == 0) {
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transmitting = 1;
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SC1_DATA = ringbuf_get(&txbuf);
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INT_SC1FLAG = INT_SCTXFREE;
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INT_SC1CFG |= INT_SCTXFREE;
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}
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#else /* TX_WITH_INTERRUPT */
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/* Loop until the transmission buffer is available. */
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while((INT_SC1FLAG & INT_SCTXFREE) == 0);
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/* Transmit the data. */
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SC1_DATA = c;
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INT_SC1FLAG = INT_SCTXFREE;
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#endif /* TX_WITH_INTERRUPT */
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}
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/*---------------------------------------------------------------------------*/
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#if ! WITH_UIP /* If WITH_UIP is defined, putchar() is defined by the SLIP driver */
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#endif /* ! WITH_UIP */
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/*---------------------------------------------------------------------------*/
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/**
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* Initalize the RS232 port.
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*
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*/
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void
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uart1_init(unsigned long ubr)
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{
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GPIO_PBCFGL &= 0xF00F;
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GPIO_PBCFGL |= 0x0490;
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u16_t uartper = (u32_t)24e6/(2*ubr);
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u32_t rest = (u32_t)24e6%(2*ubr);
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SC1_UARTFRAC = 0;
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if(rest > (2*ubr)/4 && rest < (3*2*ubr)/4){
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SC1_UARTFRAC = 1; // + 0.5
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}
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else if(rest >= (3*2*ubr)/4){
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uartper++; // + 1
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}
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SC1_UARTPER = uartper;
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SC1_UARTCFG = SC_UART8BIT;
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SC1_MODE = SC1_MODE_UART;
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SC1_INTMODE = SC_RXVALLEVEL | SC_TXFREELEVEL; // Receive buffer has data interrupt mode and Transmit buffer free interrupt mode: Level triggered.
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INT_SC1CFG = INT_SCRXVAL; // Receive buffer has data interrupt enable
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transmitting = 0;
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#if TX_WITH_INTERRUPT
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ringbuf_init(&txbuf, txbuf_data, sizeof(txbuf_data));
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#endif /* TX_WITH_INTERRUPT */
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INT_SC1FLAG = 0xFFFF;
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INT_CFGSET = INT_SC1;
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}
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/*---------------------------------------------------------------------------*/
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void uart1_rx_interrupt(void);
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void uart1_tx_interrupt(void);
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void halSc1Isr(void)
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{
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ENERGEST_ON(ENERGEST_TYPE_IRQ);
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if(INT_SC1FLAG & INT_SCRXVAL){
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uart1_rx_interrupt();
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INT_SC1FLAG = INT_SCRXVAL;
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}
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#if TX_WITH_INTERRUPT
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else if(INT_SC1FLAG & INT_SCTXFREE){
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uart1_tx_interrupt();
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INT_SC1FLAG = INT_SCTXFREE;
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}
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#endif /* TX_WITH_INTERRUPT */
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ENERGEST_OFF(ENERGEST_TYPE_IRQ);
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}
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void uart1_rx_interrupt(void)
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{
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uint8_t c;
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c = SC1_DATA;
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if(uart1_input_handler != NULL) {
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uart1_input_handler(c);
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}
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}
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/*---------------------------------------------------------------------------*/
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#if TX_WITH_INTERRUPT
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void uart1_tx_interrupt(void)
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{
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if(ringbuf_elements(&txbuf) == 0) {
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transmitting = 0;
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INT_SC1CFG &= ~INT_SCTXFREE;
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} else {
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SC1_DATA = ringbuf_get(&txbuf);
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}
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}
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#endif /* TX_WITH_INTERRUPT */
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/*---------------------------------------------------------------------------*/
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