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mspsim/tests/msp430setup.c

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/*
* Copyright (c) 2007, Swedish Institute of Computer Science.
* 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. Neither the name of the Institute 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 THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE 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.
*
* $Id: msp430setup.c,v 1.2 2007/01/22 15:45:04 nfi Exp $
*
* -----------------------------------------------------------------
*
* Author : Adam Dunkels, Joakim Eriksson, Niclas Finne
* Created : 2007-01-22
* Updated : $Date: 2007/01/22 15:45:04 $
* $Revision: 1.2 $
*/
#include "msp430setup.h"
#if __MSPGCC__
#include <msp430.h>
#include <msp430libc.h>
#include <legacymsp430.h>
#include <sys/crtld.h>
#else /* __MSPGCC__ */
#include <io.h>
#include <signal.h>
#include <sys/unistd.h>
#endif /* __MSPGCC__ */
#include <stdio.h>
/*--------------------------------------------------------------------------*/
/* RS232 Interface */
/*--------------------------------------------------------------------------*/
static int (* input_handler)(unsigned char) = NULL;
/*---------------------------------------------------------------------------*/
interrupt(UART1RX_VECTOR)
rs232_rx_usart1(void)
{
/* Check status register for receive errors. - before reading RXBUF since
it clears the error and interrupt flags */
if(!(URCTL1 & RXERR) && input_handler != NULL) {
input_handler(RXBUF1);
} else {
/* Else read out the char to clear the I-flags, etc. */
RXBUF1;
}
}
/*--------------------------------------------------------------------------*/
void
rs232_init(void)
{
/* RS232 */
UCTL1 = CHAR; /* 8-bit character */
UTCTL1 = SSEL1; /* UCLK = MCLK */
rs232_set_speed(RS232_57600);
input_handler = NULL;
ME2 |= (UTXE1 | URXE1); /* Enable USART1 TXD/RXD */
IE2 |= URXIE1; /* Enable USART1 RX interrupt */
}
/*---------------------------------------------------------------------------*/
void
rs232_send(char c)
{
/* Loop until the transmission buffer is available. */
while ((IFG2 & UTXIFG1) == 0);
/* Transmit the data. */
TXBUF1 = c;
}
/*---------------------------------------------------------------------------*/
void
rs232_set_speed(unsigned char speed)
{
if(speed == RS232_19200) {
/* Set RS232 to 19200 */
UBR01 = 0x80; /* 2,457MHz/19200 = 128 -> 0x80 */
UBR11 = 0x00; /* */
UMCTL1 = 0x00; /* no modulation */
} else if(speed == RS232_38400) {
/* Set RS232 to 38400 */
UBR01 = 0x40; /* 2,457MHz/38400 = 64 -> 0x40 */
UBR11 = 0x00; /* */
UMCTL1 = 0x00; /* no modulation */
} else if(speed == RS232_57600) {
UBR01 = 0x2a; /* 2,457MHz/57600 = 42.7 -> 0x2A */
UBR11 = 0x00; /* */
UMCTL1 = 0x5b; /* */
} else if(speed == RS232_115200) {
UBR01 = 0x15; /* 2,457MHz/115200 = 21.4 -> 0x15 */
UBR11 = 0x00; /* */
UMCTL1 = 0x4a; /* */
} else {
rs232_set_speed(RS232_57600);
}
}
/*---------------------------------------------------------------------------*/
void
rs232_set_input(int (*f)(unsigned char))
{
input_handler = f;
}
/*--------------------------------------------------------------------------*/
int
putchar(int c)
{
rs232_send(c);
return c;
}
/*--------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
void
esb_sensors_init(void)
{
P5SEL &= ~(1 << 5);
P5DIR |= (1 << 5);
}
/*---------------------------------------------------------------------------*/
void
esb_sensors_on(void)
{
P5OUT &= ~(1 << 5);
}
/*---------------------------------------------------------------------------*/
void
esb_sensors_off(void)
{
P5OUT |= (1 << 5);
}
/*---------------------------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
/* CPU INIT */
/*--------------------------------------------------------------------------*/
static void
msp430_init_dco(void)
{
/* This code taken from the FU Berlin sources and reformatted. */
#define DELTA 600
unsigned int compare, oldcapture = 0;
unsigned int i;
BCSCTL1 = 0xa4; /* ACLK is devided by 4. RSEL=6 no division for MCLK
and SSMCLK. XT2 is off. */
BCSCTL2 = 0x00; /* Init FLL to desired frequency using the 32762Hz
crystal DCO frquenzy = 2,4576 MHz */
WDTCTL = WDTPW + WDTHOLD; /* Stop WDT */
BCSCTL1 |= DIVA1 + DIVA0; /* ACLK = LFXT1CLK/8 */
for(i = 0xffff; i > 0; i--); /* Delay for XTAL to settle */
CCTL2 = CCIS0 + CM0 + CAP; // Define CCR2, CAP, ACLK
TACTL = TASSEL1 + TACLR + MC1; // SMCLK, continous mode
while(1) {
while((CCTL2 & CCIFG) != CCIFG); /* Wait until capture occured! */
CCTL2 &= ~CCIFG; /* Capture occured, clear flag */
compare = CCR2; /* Get current captured SMCLK */
compare = compare - oldcapture; /* SMCLK difference */
oldcapture = CCR2; /* Save current captured SMCLK */
if(DELTA == compare) {
break; /* if equal, leave "while(1)" */
} else if(DELTA < compare) { /* DCO is too fast, slow it down */
DCOCTL--;
if(DCOCTL == 0xFF) { /* Did DCO role under? */
BCSCTL1--;
}
} else { /* -> Select next lower RSEL */
DCOCTL++;
if(DCOCTL == 0x00) { /* Did DCO role over? */
BCSCTL1++;
}
/* -> Select next higher RSEL */
}
}
CCTL2 = 0; /* Stop CCR2 function */
TACTL = 0; /* Stop Timer_A */
BCSCTL1 &= ~(DIVA1 + DIVA0); /* remove /8 divisor from ACLK again */
}
/*---------------------------------------------------------------------------*/
static void
init_ports(void)
{
/* Turn everything off, device drivers are supposed to enable what is
* really needed!
*/
/* All configured for digital I/O */
#ifdef P1SEL
P1SEL = 0;
#endif
#ifdef P2SEL
P2SEL = 0;
#endif
#ifdef P3SEL
P3SEL = 0;
#endif
#ifdef P4SEL
P4SEL = 0;
#endif
#ifdef P5SEL
P5SEL = 0;
#endif
#ifdef P6SEL
P6SEL = 0;
#endif
/* All available inputs */
#ifdef P1DIR
P1DIR = 0;
P1OUT = 0;
#endif
#ifdef P2DIR
P2DIR = 0;
P2OUT = 0;
#endif
#ifdef P3DIR
P3DIR = 0;
P3OUT = 0;
#endif
#ifdef P4DIR
P4DIR = 0;
P4OUT = 0;
#endif
#ifdef P5DIR
P5DIR = 0;
P5OUT = 0;
#endif
#ifdef P6DIR
P6DIR = 0;
P6OUT = 0;
#endif
P1IE = 0;
P2IE = 0;
}
/*---------------------------------------------------------------------------*/
static void init_ports_toberemoved() {
////////// Port 1 ////
P1SEL = 0x00;
P1DIR = 0x81; // Outputs: P10=IRSend, P17=RS232RTS
// Inputs: P11=Light, P12=IRRec, P13=PIR, P14=Vibration,
// P15=Clockalarm, P16=RS232CTS
P1OUT = 0x00;
////////// Port 2 ////
P2SEL = 0x00; // No Sels
P2DIR = 0x7F; // Outpus: P20..P23=Leds+Beeper, P24..P26=Poti
// Inputs: P27=Taster
P2OUT = 0x77;
////////// Port 3 ////
P3SEL = 0xE0; // Sels for P34..P37 to activate UART,
P3DIR = 0x5F; // Inputs: P30..P33=CON4, P35/P37=RXD Transceiver/RS232
// OutPuts: P36/P38=TXD Transceiver/RS232
P3OUT = 0xE0; // Output a Zero on P34(TXD Transceiver) and turn SELECT off when receiving!!!
////////// Port 4 ////
P4SEL = 0x00; // CON5 Stecker
P4DIR = 0xFF;
P4OUT = 0x00;
////////// Port 5 ////
P5SEL = 0x00; // P50/P51= Clock SDA/SCL, P52/P53/P54=EEPROM SDA/SCL/WP
P5DIR = 0xDA; // P56/P57=Transceiver CNTRL0/1
P5OUT = 0x0F;
////////// Port 6 ////
P6SEL = 0x00; // P60=Microphone, P61=PIR digital (same as P13), P62=PIR analog
P6DIR = 0x00; // P63=extern voltage, P64=battery voltage, P65=Receive power
P6OUT = 0x00;
}
/*--------------------------------------------------------------------------*/
void
msp430_setup(void)
{
dint();
init_ports();
msp430_init_dco();
eint();
init_ports_toberemoved();
esb_sensors_init();
esb_sensors_on();
rs232_init();
}
#define asmv(arg) __asm__ __volatile__(arg)
#define STACK_EXTRA 32
static char *cur_break = (char *)(
#if defined(__MSP430_LIBC__) && 20110612 <= __MSP430_LIBC__
__bss_end
#else
&__bss_end + 1
#endif
);
/*
* Allocate memory from the heap. Check that we don't collide with the
* stack right now (some other routine might later). A watchdog might
* be used to check if cur_break and the stack pointer meet during
* runtime.
*/
void *
sbrk(int incr)
{
char *stack_pointer;
asmv("mov r1, %0" : "=r" (stack_pointer));
stack_pointer -= STACK_EXTRA;
if(incr > (stack_pointer - cur_break))
return (void *)-1; /* ENOMEM */
void *old_break = cur_break;
cur_break += incr;
/*
* If the stack was never here then [old_break .. cur_break] should
* be filled with zeros.
*/
return old_break;
}
/*
* Mask all interrupts that can be masked.
*/
int
splhigh_(void)
{
/* Clear the GIE (General Interrupt Enable) flag. */
int sr;
asmv("mov r2, %0" : "=r" (sr));
asmv("bic %0, r2" : : "i" (GIE));
return sr & GIE; /* Ignore other sr bits. */
}
/*
* Restore previous interrupt mask.
*/
void
splx_(int sr)
{
/* If GIE was set, restore it. */
asmv("bis %0, r2" : : "r" (sr));
}
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