osd-contiki/cpu/stm32w108/dev/uart1.c

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/**
* \addtogroup stm32w-cpu
*
* @{
*/
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/*
* Copyright (c) 2010, STMicroelectronics.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*
*/
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/**
* \file
* Machine dependent STM32W UART1 code.
* \author
* Salvatore Pitrulli
* \version
* 0.1
* \since
* 03.04.2010
*/
#include <stdio.h>
#include <stdlib.h>
#include "sys/energest.h"
#include "dev/uart1.h"
#include "dev/watchdog.h"
#include "lib/ringbuf.h"
#include "dev/leds.h"
static int (*uart1_input_handler) (unsigned char c);
void uart1_rx_interrupt(void);
void uart1_tx_interrupt(void);
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static volatile uint8_t transmitting;
#ifdef UART1_CONF_TX_WITH_INTERRUPT
#define TX_WITH_INTERRUPT UART1_CONF_TX_WITH_INTERRUPT
#else /* UART1_CONF_TX_WITH_INTERRUPT */
#define TX_WITH_INTERRUPT 1
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#endif /* UART1_CONF_TX_WITH_INTERRUPT */
#if TX_WITH_INTERRUPT
#ifdef UART1_CONF_TX_BUFSIZE
#define UART1_TX_BUFSIZE UART1_CONF_TX_BUFSIZE
#else /* UART1_CONF_TX_BUFSIZE */
#define UART1_TX_BUFSIZE 64
#endif /* UART1_CONF_TX_BUFSIZE */
static struct ringbuf txbuf;
static uint8_t txbuf_data[UART1_TX_BUFSIZE];
#endif /* TX_WITH_INTERRUPT */
/*---------------------------------------------------------------------------*/
void
uart1_set_input(int (*input) (unsigned char c))
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{
uart1_input_handler = input;
}
/*---------------------------------------------------------------------------*/
void
uart1_writeb(unsigned char c)
{
watchdog_periodic();
#if TX_WITH_INTERRUPT
/*
* Put the outgoing byte on the transmission buffer. If the buffer
* is full, we just keep on trying to put the byte into the buffer
* until it is possible to put it there.
*/
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while(ringbuf_put(&txbuf, c) == 0);
/*
* If there is no transmission going, we need to start it by putting
* the first byte into the UART.
*/
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if(transmitting == 0) {
transmitting = 1;
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SC1_DATA = ringbuf_get(&txbuf);
INT_SC1FLAG = INT_SCTXFREE;
INT_SC1CFG |= INT_SCTXFREE;
}
#else /* TX_WITH_INTERRUPT */
/* Loop until the transmission buffer is available. */
while((INT_SC1FLAG & INT_SCTXFREE) == 0);
/* Transmit the data. */
SC1_DATA = c;
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INT_SC1FLAG = INT_SCTXFREE;
#endif /* TX_WITH_INTERRUPT */
}
/*---------------------------------------------------------------------------*/
#if ! NETSTACK_CONF_WITH_IPV4
/* If NETSTACK_CONF_WITH_IPV4 is defined, putchar() is defined by the SLIP driver */
#endif /* ! NETSTACK_CONF_WITH_IPV4 */
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/*---------------------------------------------------------------------------*/
/*
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* Initalize the RS232 port.
*/
void
uart1_init(unsigned long ubr)
{
uint16_t uartper;
uint32_t rest;
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GPIO_PBCFGL &= 0xF00F;
GPIO_PBCFGL |= 0x0490;
uartper = (uint32_t) 24e6 / (2 * ubr);
rest = (uint32_t) 24e6 % (2 * ubr);
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SC1_UARTFRAC = 0;
if(rest > (2 * ubr) / 4 && rest < (3 * 2 * ubr) / 4) {
SC1_UARTFRAC = 1; /* + 0.5 */
} else if(rest >= (3 * 2 * ubr) / 4) {
uartper++; /* + 1 */
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}
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SC1_UARTPER = uartper;
SC1_UARTCFG = SC_UART8BIT;
SC1_MODE = SC1_MODE_UART;
/*
* Receive buffer has data interrupt mode and Transmit buffer free interrupt
* mode: Level triggered.
*/
SC1_INTMODE = SC_RXVALLEVEL | SC_TXFREELEVEL;
INT_SC1CFG = INT_SCRXVAL; /* Receive buffer has data interrupt enable */
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transmitting = 0;
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#if TX_WITH_INTERRUPT
ringbuf_init(&txbuf, txbuf_data, sizeof(txbuf_data));
#endif /* TX_WITH_INTERRUPT */
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INT_SC1FLAG = 0xFFFF;
INT_CFGSET = INT_SC1;
}
/*---------------------------------------------------------------------------*/
void
halSc1Isr(void)
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{
ENERGEST_ON(ENERGEST_TYPE_IRQ);
if(INT_SC1FLAG & INT_SCRXVAL) {
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uart1_rx_interrupt();
INT_SC1FLAG = INT_SCRXVAL;
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}
#if TX_WITH_INTERRUPT
else if(INT_SC1FLAG & INT_SCTXFREE) {
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uart1_tx_interrupt();
INT_SC1FLAG = INT_SCTXFREE;
}
#endif /* TX_WITH_INTERRUPT */
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ENERGEST_OFF(ENERGEST_TYPE_IRQ);
}
/*--------------------------------------------------------------------------*/
void
uart1_rx_interrupt(void)
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{
uint8_t c;
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c = SC1_DATA;
if(uart1_input_handler != NULL) {
uart1_input_handler(c);
}
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}
/*---------------------------------------------------------------------------*/
#if TX_WITH_INTERRUPT
void
uart1_tx_interrupt(void)
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{
if(ringbuf_elements(&txbuf) == 0) {
transmitting = 0;
INT_SC1CFG &= ~INT_SCTXFREE;
} else {
SC1_DATA = ringbuf_get(&txbuf);
}
}
#endif /* TX_WITH_INTERRUPT */
/** @} */