Lab 2 energy consumption, wireless chat

1. Lab 2energy consumption,wireless chat Thomas Watteyne EE290Q – Spring 2010 http://wsn.eecs.berkeley.edu/290Q

2. Simple Tx/Rx Init MSP430 (clock, leds, button) Init CC2500 (pins, SPI, registers) CC2500 to RX state Start CC2500 oscill. (IDLE state) low power mode, waiting for interrupts Executed when packet received (“meta” interrupt declaration) Executed when button pushed clear button interrupt flag copy to cc2500 TXFIFO and send declare packet w. max length declare useful length txrx_simple #include "mrfi.h" int main(void) { BSP_Init(); P1REN |= 0x04; P1IE |= 0x04; MRFI_Init(); MRFI_WakeUp(); MRFI_RxOn(); __bis_SR_register(GIE+LPM4_bits); } void MRFI_RxCompleteISR() { P1OUT ^= 0x02; } #pragma vector=PORT1_VECTOR __interrupt void Port_1 (void) { P1IFG &= ~0x04; mrfiPacket_t packet; packet.frame[0]=8+20; MRFI_Transmit(&packet, MRFI_TX_TYPE_FORCED); P1OUT ^= 0x01; }

3. Change Channel #include "radios/family1/mrfi_spi.h" mrfiSpiWriteReg(CHANNR,0x10); Removing this line cause continuous transmissions txrx_simple #include "mrfi.h" int main(void) { BSP_Init(); P1REN |= 0x04; P1IE |= 0x04; MRFI_Init(); MRFI_WakeUp(); MRFI_RxOn(); __bis_SR_register(GIE+LPM4_bits); } void MRFI_RxCompleteISR() { P1OUT ^= 0x02; } #pragma vector=PORT1_VECTOR __interrupt void Port_1 (void) { P1IFG &= ~0x04; mrfiPacket_t packet; packet.frame[0]=8+20; MRFI_Transmit(&packet, MRFI_TX_TYPE_FORCED); P1OUT ^= 0x01; }

4. Continuous Transmission

5. Change Transmission Power #include "radios/family1/mrfi_spi.h" mrfiSpiWriteReg(PATABLE,0xFF); txrx_simple #include "mrfi.h" int main(void) { BSP_Init(); P1REN |= 0x04; P1IE |= 0x04; MRFI_Init(); MRFI_WakeUp(); MRFI_RxOn(); __bis_SR_register(GIE+LPM4_bits); } void MRFI_RxCompleteISR() { P1OUT ^= 0x02; } #pragma vector=PORT1_VECTOR __interrupt void Port_1 (void) { P1IFG &= ~0x04; mrfiPacket_t packet; packet.frame[0]=8+20; MRFI_Transmit(&packet, MRFI_TX_TYPE_FORCED); P1OUT ^= 0x01; }

6. Impact of Transmission Power

7. Wireless Chat [1/3] Enable UART txrx_chat #include "radios/family1/mrfi_spi.h" #include "mrfi.h" uint8_t index_output = 9; mrfiPacket_tpacketToSend; int main(void) { BSP_Init(); MRFI_Init(); P3SEL |= 0x30; // P3.4,5 = USCI_A0 TXD/RXD UCA0CTL1 = UCSSEL_2; // SMCLK UCA0BR0 = 0x41; // 9600 from 8Mhz UCA0BR1 = 0x3; UCA0MCTL = UCBRS_2; UCA0CTL1 &= ~UCSWRST; // Initialize USCI state machine IE2 |= UCA0RXIE; // Enable USCI_A0 RX interrupt MRFI_WakeUp(); MRFI_RxOn(); index_output=0; __bis_SR_register(GIE+LPM4_bits); }

8. Wireless Chat [2/3] when received a packet Copy RXFIFO into “packet” newline(for PuTTY) write over serial port txrx_chat void MRFI_RxCompleteISR() { uint8_t i; P1OUT ^= 0x02; mrfiPacket_t packet; MRFI_Receive(&packet); char output[] = {" "}; for (i=9;i<29;i++) { output[i-9]=packet.frame[i]; if (packet.frame[i]=='\r') { output[i-9]='\n'; output[i-8]='\r'; } } TXString(output, (sizeof output)); }

9. Wireless Chat [3/3] copy serial input buffer to “rx” when received one character over serial port Append to the packet being constructed newline or packet full copy to TXFIFO, trigger Tx re-initialize echo over serial port txrx_chat #pragma vector=USCIAB0RX_VECTOR __interrupt void USCI0RX_ISR(void) { char rx = UCA0RXBUF; uint8_t i; packetToSend.frame[index_output]=rx; index_output++; if (rx=='\r' || index_output==29) { packetToSend.frame[0]=28; MRFI_Transmit(&packetToSend, MRFI_TX_TYPE_FORCED); index_output = 9; for(i=9;i<29;i++) { packetToSend.frame[i]=' '; } P1OUT ^= 0x01; } P1OUT ^= 0x02; TXString(&rx, 1); }