235 lines
6.6 KiB
C
235 lines
6.6 KiB
C
/*
|
|
Copyright 2007, Freie Universitaet Berlin. All rights reserved.
|
|
|
|
These sources were developed at the Freie Universität Berlin, Computer
|
|
Systems and Telematics group.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are
|
|
met:
|
|
|
|
- Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
|
|
- 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.
|
|
|
|
- Neither the name of Freie Universitaet Berlin (FUB) nor the names of its
|
|
contributors may be used to endorse or promote products derived from
|
|
this software without specific prior written permission.
|
|
|
|
This software is provided by FUB and the contributors on an "as is"
|
|
basis, without any representations or warranties of any kind, express
|
|
or implied including, but not limited to, representations or
|
|
warranties of non-infringement, merchantability or fitness for a
|
|
particular purpose. In no event shall FUB or contributors 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.
|
|
|
|
This implementation was developed by the CST group at the FUB.
|
|
|
|
For documentation and questions please use the web site
|
|
http://scatterweb.mi.fu-berlin.de and the mailinglist
|
|
scatterweb@lists.spline.inf.fu-berlin.de (subscription via the Website).
|
|
Berlin, 2007
|
|
*/
|
|
|
|
/**
|
|
* @file ScatterWeb.Uart.c
|
|
* @addtogroup interfaces
|
|
* @brief UART interface
|
|
* @author Michael Baar <baar@inf.fu-berlin.de>
|
|
*
|
|
* UART switch for RS232 and SPI protocols on UART1 written for
|
|
* ScatterWeb MSB boards. Compatible to ScatterWeb EOS,
|
|
* ScatterWeb Bootload and Contiki.
|
|
*/
|
|
|
|
#include <io.h>
|
|
#include <signal.h>
|
|
#include <string.h>
|
|
#include "dev/msb430-uart1.h"
|
|
#include "msp430.h"
|
|
#include "dev/lpm.h"
|
|
|
|
#ifndef U1ME
|
|
#define U1ME ME2
|
|
#endif
|
|
|
|
static volatile unsigned char uart_mode = UART_MODE_RESET;
|
|
static volatile unsigned char uart_lockcnt = 0;
|
|
volatile uint8_t uart_edge = 0;
|
|
|
|
static unsigned char uart_speed_br0[UART_NUM_MODES];
|
|
static unsigned char uart_speed_br1[UART_NUM_MODES];
|
|
static unsigned char uart_speed_bmn[UART_NUM_MODES];
|
|
static fp_uart_handler uart_handler[UART_NUM_MODES] = {NULL, NULL};
|
|
|
|
/*---------------------------------------------------------------------------*/
|
|
static void
|
|
uart_configure(unsigned mode)
|
|
{
|
|
_DINT(); // disable interrupts
|
|
|
|
UART_WAIT_TXDONE(); // wait till all buffered data has been transmitted
|
|
|
|
// configure
|
|
if(mode == UART_MODE_RS232) {
|
|
P5OUT |= 0x01;
|
|
// unselect SPI
|
|
P3SEL |= 0xC0;
|
|
// select rs232
|
|
// to RS232 mode
|
|
UCTL1 = SWRST | CHAR; // 8-bit character
|
|
UTCTL1 |= SSEL1; // UCLK = MCLK
|
|
// activate
|
|
U1ME |= UTXE1 | URXE1; // Enable USART1 TXD/RXD
|
|
} else if(mode == UART_MODE_SPI) {
|
|
P3SEL &= ~0xC0; // unselect RS232
|
|
// to SPI mode
|
|
UCTL1 = SWRST | CHAR | SYNC | MM; // 8-bit SPI Master
|
|
/*
|
|
* SMCLK, 3-pin mode, clock idle low, data valid on
|
|
* rising edge, UCLK delayed
|
|
*/
|
|
UTCTL1 |= CKPH | SSEL1 | SSEL0 | STC; // activate
|
|
U1ME |= USPIE1; // Enable USART1 SPI
|
|
}
|
|
|
|
// restore speed settings
|
|
UBR01 = uart_speed_br0[mode]; // set baudrate
|
|
UBR11 = uart_speed_br1[mode];
|
|
UMCTL1 = uart_speed_bmn[mode]; // set modulation
|
|
|
|
UCTL1 &= ~SWRST; // clear reset flag
|
|
_EINT(); // enable interrupts
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
uart_set_speed(unsigned mode, unsigned ubr0,
|
|
unsigned ubr1, unsigned umctl)
|
|
{
|
|
// store setting
|
|
uart_speed_br0[mode] = ubr0; // baudrate
|
|
uart_speed_br1[mode] = ubr1; // baudrate
|
|
uart_speed_bmn[mode] = umctl; // modulation
|
|
|
|
// reconfigure, if mode active
|
|
if (uart_mode == mode) {
|
|
uart_configure(mode);
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
uart_set_handler(unsigned mode, fp_uart_handler fpHandler)
|
|
{
|
|
// store setting
|
|
uart_handler[mode] = fpHandler;
|
|
if(mode == uart_mode) {
|
|
if (fpHandler == NULL) {
|
|
IE2 &= ~URXIE1; // Disable USART1 RX interrupt
|
|
} else {
|
|
IE2 |= URXIE1; // Enable USART1 RX interrupt
|
|
}
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
int
|
|
uart_lock(unsigned mode)
|
|
{
|
|
// already locked?
|
|
if(uart_mode != mode && uart_lockcnt > 0) {
|
|
return 0;
|
|
}
|
|
|
|
// increase lock count
|
|
uart_lockcnt++;
|
|
// switch mode (if neccessary)
|
|
uart_set_mode(mode);
|
|
return 1;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
int
|
|
uart_lock_wait(unsigned mode)
|
|
{
|
|
while(UART_WAIT_LOCK(mode)) {
|
|
_NOP();
|
|
}
|
|
return uart_lock(mode);
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
int
|
|
uart_unlock(unsigned mode)
|
|
{
|
|
if((uart_lockcnt == 0) || (mode != uart_mode)) {
|
|
uart_lockcnt = 0;
|
|
uart_set_mode(UART_MODE_DEFAULT);
|
|
return 0;
|
|
}
|
|
|
|
// decrement lock
|
|
if (uart_lockcnt > 0) {
|
|
uart_lockcnt--;
|
|
// if no more locks, switch back to default mode
|
|
if(uart_lockcnt == 0) {
|
|
uart_set_mode(UART_MODE_DEFAULT);
|
|
}
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
uart_set_mode(unsigned mode)
|
|
{
|
|
// do nothing if mode already set
|
|
if(mode == uart_mode) {
|
|
return;
|
|
}
|
|
|
|
IE2 &= ~(URXIE1 | UTXIE1); // disable irq
|
|
uart_configure(mode); // configure uart parameters
|
|
uart_mode = mode;
|
|
|
|
if(uart_handler[mode] != NULL) {
|
|
IE2 |= URXIE1; // Enable USART1 RX interrupt
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
int
|
|
uart_get_mode(void)
|
|
{
|
|
return uart_mode;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
interrupt(UART1RX_VECTOR)
|
|
uart_rx(void)
|
|
{
|
|
fp_uart_handler handler = uart_handler[uart_mode];
|
|
int c;
|
|
|
|
if(!(IFG2 & URXIFG1)) {
|
|
// If start edge detected, toggle & return
|
|
uart_edge = 1;
|
|
U1TCTL &= ~URXSE;
|
|
U1TCTL |= URXSE;
|
|
_BIC_SR_IRQ(LPM3_bits);
|
|
return;
|
|
}
|
|
uart_edge = 0;
|
|
if(!(URCTL1 & RXERR)) {
|
|
c = UART_RX;
|
|
if(handler(c)) {
|
|
_BIC_SR_IRQ(LPM3_bits);
|
|
}
|
|
} else {
|
|
// read out the char to clear the I-flags, etc.
|
|
c = UART_RX;
|
|
}
|
|
}
|