I am trying to port the code to low power mode (my initial goal was to make my code work). I wanted to know if I am doing it right, or I still need to change the code, so it consumes as little power as possible. I am using ACLK clock. Please advice, if I could do any thing, so the code uses minimum power.
#include "mrfi.h"
#include "radios/family1/mrfi_spi.h"
#include "drivers/timer/timer.h"
#define TURT_ID 2
#define POLYNOMIAL 0xD8;
#define WIDTH 8
#define TOPBIT (1 << (WIDTH - 1))
volatile int radioReady = 1;
int8_t rssi;
unsigned int i = 0;
volatile uint32_t globaltimer = 0;
unsigned char seconds = 0;
char count[7];
void initializeRandomTimer(){
//unsigned int rand;
//rand = TI_getRandomIntegerFromVLO();
BCSCTL3 |= LFXT1S_2;
TACCTL0 = CCIE;
TACCR0= 3933 ; //goes for 3+random seconds
TACTL = MC_1 | TASSEL_1 | ID_3;
}
uint8_t getCRC(mrfiPacket_t *packet, char size){
uint8_t remainder= 0;
uint8_t i = 0;
for(i =0; i < size; ++i)
{
remainder = remainder ^ (packet->frame[i] << (WIDTH - 8));
uint8_t bit = 0;
for(bit = 8; bit > 0; --bit)
{
if(remainder & TOPBIT)
{
remainder = (remainder << 1) ^ POLYNOMIAL;
}
else
{
remainder = (remainder << 1);
}
}
}
return remainder;
}
int main(void)
{
P3SEL = 0x30;
BSP_Init();
MRFI_Init();
P3SEL |= 0x30;
UCA0CTL1 = UCSSEL_2;
UCA0BR0 = 0x41;
UCA0BR1 = 0x3;
UCA0MCTL = UCBRS_2;
UCA0CTL1 &= ~UCSWRST;
IE2 |= UCA0RXIE;
mrfiSpiWriteReg(PATABLE, 0xFF);
MRFI_WakeUp();
MRFI_RxOn();
initializeRandomTimer();
//initializeTimerB();
__bis_SR_register(LPM3_bits + GIE);
for(;;){
__bis_SR_register(LPM1_bits);
if(radioReady==1){
mrfiPacket_t packet;
packet.frame[0]=8+20;
packet.frame[1]=rssi;
packet.frame[2]=TURT_ID;
packet.frame[3] = globaltimer >> 16; //Timer 1 byte
packet.frame[4] = (globaltimer >> 8) & 0xFF; //Timer 2 byte
packet.frame[5] = globaltimer & 0xFF; //Timer 3 byte
packet.frame[6] = getCRC(&packet, 6); //CRC
MRFI_Transmit(&packet, MRFI_TX_TYPE_FORCED);
P1OUT^=0x01;
radioReady=0;
}
}
}
void MRFI_RxCompleteISR()
{
rssi=MRFI_Rssi();
mrfiPacket_t packet;
MRFI_Receive(&packet);
count[0] = packet.frame[0];
count[1] = packet.frame[1];
count[2] = packet.frame[2];
count[3] = packet.frame[3];
count[4] = packet.frame[4];
count[5] = packet.frame[5];
count[6] = packet.frame[6];
TXString(count,7);
char arr[1];
arr[0] = getCRC(&packet, 6);
TXString(arr, 1);
if(packet.frame[6] == getCRC(&packet, 6)) P1OUT ^= 0x02;
}
// Timer A0 interrupt service routine
interrupt(TIMERA0_VECTOR) Timer_A (void)
{
radioReady=1;
if(++i>=20){
globaltimer++;
i=0;
}
__bic_SR_register_on_exit(LPM3_bits);
}
