forked from mzwerg/solar-harvester
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main.c
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main.c
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//******************************************************************************
// MSP430F2211 Solar Demo
//
// Description:
//
// ACLK = LFXTAL 32kHz, MCLK = DCO 8MHz, SMCLK = DCO 1MHz
//
// MSP430F2211
// -----------------
// /|\| XIN|-
// | | | 32kHz
// --|RST XOUT|-
// | |
// Vin-->|P1.6/CA06 P1.0|--> LED = pulse 1Hz
//
//
// Michael Zwerg
// March 2013
//******************************************************************************
#include <msp430g2211.h>
/***********************************/
/* Init WDT as delay counter */
/***********************************/
volatile unsigned int wdt_tick_cnt = 0;
volatile unsigned int delay_cnt = 0;
void init_wdta ( void )
{
WDTCTL = WDTPW + WDTHOLD; // hold WDT
IE1 &= ~WDTIE; // disable WDT interrupt
}
void delay_1s (unsigned int delay_value )
{
if (delay_value > 0)
{
wdt_tick_cnt = 0; // init tick counter
delay_cnt = delay_value; // set delay value
IFG1 &= ~WDTIFG; // clear all pending interrupts
IE1 |= WDTIE; // enable WDT interrupt
WDTCTL = WDT_ADLY_1000; // start WDT in interrupt mode
__bis_SR_register(LPM3_bits + GIE); // Enter LPM3, enable interrupts
}
}
void delay_250ms (unsigned int delay_value )
{
if (delay_value > 0)
{
wdt_tick_cnt = 0; // init tick counter
delay_cnt = delay_value; // set delay value
IFG1 &= ~WDTIFG; // clear all pending interrupts
IE1 |= WDTIE; // enable WDT interrupt
WDTCTL = WDT_ADLY_250; // start WDT in interrupt mode
__bis_SR_register(LPM3_bits + GIE); // Enter LPM3, enable interrupts
}
}
void delay_1ms (unsigned int delay_value )
{
if (delay_value > 0)
{
wdt_tick_cnt = 0; // init tick counter
delay_cnt = delay_value<<1; // set delay value
IFG1 &= ~WDTIFG; // clear all pending interrupts
IE1 |= WDTIE; // enable WDT interrupt
WDTCTL = WDT_MDLY_0_5; // start WDT in interrupt mode
__bis_SR_register(LPM0_bits + GIE); // Enter LPM0, enable interrupts
}
}
#pragma vector = WDT_VECTOR
__interrupt void WDT_ISR(void)
{
wdt_tick_cnt++;
if (wdt_tick_cnt == delay_cnt) // if delay reached
{
WDTCTL = WDTPW + WDTHOLD; // stop WDTA
IE1 &= ~WDTIE; // disable WDT interrupt
__bic_SR_register_on_exit(LPM3_bits); // wakeup from LPM
}
}
/***********************************/
/* Init Clock system */
/***********************************/
void init_cs ( void )
{
P2SEL |= 0xC0; // Select XT1 (P2.6 & P2.7)
do { // Loop until XT1,XT2 & DCO stabilizes
BCSCTL3 &= ~(LFXT1OF); // Clear fault flags
IFG1 &= ~OFIFG; // Clear fault flags
delay_250ms(1); // wait 250ms
} while (IFG1&OFIFG); // Test oscillator fault flag
if (CALBC1_1MHZ==0xFF) // If calibration constant erased
{
while(1); // do not load, trap CPU!!
}
DCOCTL = 0; // Select lowest DCOx and MODx settings
BCSCTL1 = CALBC1_1MHZ; // Set DCO to 1MHz
DCOCTL = CALDCO_1MHZ;
}
/***********************************/
/* Init COMPA module */
/***********************************/
void init_comp ( void )
{
CAPD = CAPD6; // disable digital function on COMP pin
CACTL2 = P2CA3+P2CA2+CAF; // assign P1.6/CA6 as input
}
char comp ( void )
{
char caout;
CACTL1 = CAON+CAREF0; // enable COMPA
caout = CACTL2 & CAOUT;
CACTL1 = 0;
return (caout);
}
/***********************************/
/* Init Port module */
/***********************************/
void init_port ( void )
{
// all (unused) port pins to LOW
P1OUT = 0;
P2OUT = 0;
// all (unused) port pins to OUTPUT
P1DIR = 0xFF;
P2DIR = 0xFF;
}
void init_port_sw2 ( void )
{
// configure P1.3 as SW2
P1DIR &= ~(BIT3);
P1REN |= (BIT3);
P1OUT |= (BIT3);
P1IFG = 0xFF;
P1IFG = 0x00;
P1IE |= (BIT3);
}
#pragma vector = PORT1_VECTOR
__interrupt void PRT1_ISR(void)
{
P1IFG = 0;
__bic_SR_register_on_exit(LPM4_bits); // wakeup from LPM
}
/***********************************/
/* MAIN */
/***********************************/
void main( void )
{
// initialize all system relevant modules like
// Clock System, Power Managment Module, I/O-Ports
init_wdta ();
init_port ();
init_cs ();
init_port_sw2 ();
init_comp ();
// __bis_SR_register(LPM4_bits+GIE); // Enter LPM3, enable interrupts
while (1)
{
delay_250ms(1);
if (comp()==0)
{
P1OUT |= 0x01;
delay_1ms(200);
P1OUT &= ~0x01;
}
}
}