Микроконтроллеры

Кто работал с MSP430F5xxx? Есть ли некие правила написания кода в IAR для обхода errata в этом ядре. Очень неохота собирать грабли. Смотрю вот примерчик для CC430 от TI. И непонятно, где то натыканы NOP, а где то отсутствуют. Например, NOP есть в завершении функции, и "для надежности? :)" после ее вызова. / #include "RF_Toggle_LED_Demo.h" extern RF_SETTINGS rfSettings; unsigned char packetReceived; unsigned char packetTransmit; unsigned char txBytesLeft = PACKET_LEN+1; // +1 for length byte unsigned char txPosition = 0; unsigned char rxBytesLeft = PACKET_LEN+2; // +3 for len & status bytes unsigned char rxPosition = 0; unsigned char lengthByteRead = 0; unsigned char RxBufferLength = 0; unsigned char TxBufferLength = 0; unsigned char * _p_Buffer = 0; unsigned char buttonPressed = 0; unsigned int i = 0; unsigned char transmitting = 0; unsigned char receiving = 0; unsigned char RxBuffer[PACKET_LEN+2] = {0}; unsigned char TxBuffer[PACKET_LEN+1]= { PACKET_LEN, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, }; void main( void ) { // Stop watchdog timer to prevent time out reset WDTCTL = WDTPW + WDTHOLD; // Increase PMMCOREV level to 2 for proper radio operation SetVCore(2); ResetRadioCore(); InitButtonLeds(); InitTimer(); // Clean out the RX Buffer rxPosition = PACKET_LEN+2; while(rxPosition--) { RxBuffer[rxPosition] = 0; } InitRadio(); ReceiveOn(); while (1) { P1IE |= BIT7; // Enable button interrupt __bis_SR_register( LPM3_bits + GIE ); __no_operation(); if (buttonPressed) // Process a button press->transmit { ReceiveOff(); // Button means TX, stop RX receiving = 0; TransmitPacket(); buttonPressed = 0; // Re-enable button press } if(receiving) { ReceivePacket(); __no_operation(); } if(!transmitting) { ReceiveOn(); } } } void ReceivePacket(void) { rxBytesLeft = PACKET_LEN + 2;// Set maximum packet leng + 2 for appended bytes rxPosition = 0; packetReceived = 0; __delay_cycles(2800); // Wait for bytes to fill in RX FIFO TA0CCR1 = RX_TIMER_PERIOD; // x cycles * 1/32768 = y us TA0CCTL1 |= CCIE; TA0CTL |= MC_2 + TACLR; // Start the timer- continuous mode __bis_SR_register(LPM3_bits + GIE); __no_operation(); TA0CCR1 = RX_TIMER_PERIOD; TA0CCTL1 &= ~(CCIE); TA0CTL &= ~(MC_3); // Turn off timer __no_operation(); } void TransmitPacket(void) { P3OUT |= BIT6; // Pulse LED during Transmit txBytesLeft = PACKET_LEN + 1; txPosition = 0; packetTransmit = 0; transmitting = 1; Strobe( RF_STX ); // Strobe STX TA0CCR1 = TX_TIMER_PERIOD; // x cycles * 1/32768 = y us TA0CCTL1 |= CCIE; TA0CTL |= MC_2 + TACLR; // Start the timer- continuous mode __bis_SR_register(LPM3_bits + GIE); __no_operation(); TA0CCR1 = TX_TIMER_PERIOD; // x cycles * 1/32768 = y us TA0CCTL1 &= ~(CCIE); TA0CTL &= ~(MC_3); // Turn off timer P3OUT &= ~BIT6; // Turn off LED after Transmit } void ReceiveOn(void) { RF1AIES &= ~BIT9; RF1AIFG = 0; // Clear pending RFIFG interrupts RF1AIE |= BIT9; // Enable the sync word received interrupt // Radio is in IDLE following a TX, so strobe SRX to enter Receive Mode Strobe( RF_SRX ); __no_operation(); } void ReceiveOff(void) { RF1AIE &= ~BIT9; // Disable RX interrupts RF1AIFG &= ~BIT9; // Clear pending IFG RF1AIES &= ~BIT9; // Switch back to to sync word // It is possible that ReceiveOff is called while radio is receiving a packet. // Therefore, it is necessary to flush the RX FIFO after issuing IDLE strobe // such that the RXFIFO is empty prior to receiving a packet. Strobe(RF_SIDLE); Strobe(RF_SFRX); } //------------------------------------------------------------------------------ // void pktRxHandler(void) // // DESCRIPTION: // This function is called every time a timer interrupt occurs. The // function starts by retreiving the status byte. Every time the status // byte indicates that there are available bytes in the RX FIFO, bytes are // read from the RX FIFO and written to RxBuffer. This is done until the // whole packet is received. If the status byte indicates that there has // been an RX FIFO overflow the RX FIFO is flushed. Please see the // EM430F5137RF900 RF Examples User Manual for a flow chart describing this // function. //------------------------------------------------------------------------------ void pktRxHandler(void) { unsigned char RxStatus; unsigned char bytesInFifo; // Which state? RxStatus = Strobe(RF_SNOP); switch(RxStatus & CC430_STATE_MASK) { case CC430_STATE_RX: // If there's anything in the RX FIFO.... if (bytesInFifo = MIN(rxBytesLeft, RxStatus & CC430_FIFO_BYTES_AVAILABLE_MASK)) { if((rxBytesLeft == PACKET_LEN + 2) && !lengthByteRead) { rxBytesLeft = ReadSingleReg(RXFIFO) + 2; // For appended bytes lengthByteRead = 1; } // Update how many bytes are left to be received rxBytesLeft -= bytesInFifo; // Read from RX FIFO and store the data in rxBuffer while (bytesInFifo--) { RxBuffer[rxPosition] = ReadSingleReg(RXFIFO); rxPosition++; } if (!rxBytesLeft){ packetReceived = 1; receiving = 0; lengthByteRead = 0; ReceiveOff(); P1OUT ^= BIT0; // Toggle LED1 } } break; default: if(!packetReceived) { packetReceived = 1; } rxBytesLeft = 0; receiving = 0; ReceiveOff(); break; } } // pktRxHandler //------------------------------------------------------------------------------ // void pktTxHandler(void) // // DESCRIPTION: // This function is called every time a timer interrupt occurs. The function starts // by getting the status byte. Every time the status byte indicates that there // is free space in the TX FIFO, bytes are taken from txBuffer and written to // the TX FIFO until the whole packet is written or the TXFIFO has underflowed. // See the EM430F5137RF900 RF Examples User Manual for a flow chart describing // this function. //------------------------------------------------------------------------------ void pktTxHandler(void) { unsigned char freeSpaceInFifo; unsigned char TxStatus; // Which state? TxStatus = Strobe(RF_SNOP); switch (TxStatus & CC430_STATE_MASK) { case CC430_STATE_TX: // If there's anything to transfer.. if (freeSpaceInFifo = MIN(txBytesLeft, TxStatus & CC430_FIFO_BYTES_AVAILABLE_MASK)) { txBytesLeft -= freeSpaceInFifo; while(freeSpaceInFifo--) { WriteSingleReg(TXFIFO, TxBuffer[txPosition]); txPosition++; } if(!txBytesLeft) { RF1AIES |= BIT9; // End-of-packet TX interrupt RF1AIFG &= ~BIT9; // clear RFIFG9 while(!(RF1AIFG & BIT9)); // poll RFIFG9 for TX end-of-packet RF1AIES &= ~BIT9; // End-of-packet TX interrupt RF1AIFG &= ~BIT9; // clear RFIFG9 transmitting = 0; packetTransmit = 1; } } break; case CC430_STATE_TX_UNDERFLOW: Strobe(RF_SFTX); // Flush the TX FIFO __no_operation(); // No break here! default: if(!packetTransmit) packetTransmit = 1; if (transmitting) { if ((TxStatus & CC430_STATE_MASK) == CC430_STATE_IDLE) { transmitting = 0; } } break; } } // pktTxHandler void InitTimer(void) { P5SEL |= 0x03; // Set xtal pins LFXT_Start(XT1DRIVE_0); TA0CCR1 = RX_TIMER_PERIOD; // x cycles * 1/32768 = y us TA0CCTL1 = CCIE; // Enable interrupts TA0CTL = TASSEL__ACLK + TACLR; // ACLK source } void InitButtonLeds(void) { // Set up the button as interruptible P1DIR &= ~BIT7; P1REN |= BIT7; P1IES &= BIT7; P1IFG = 0; P1OUT |= BIT7; P1IE |= BIT7; // Initialize Port J PJOUT = 0x00; PJDIR = 0xFF; // Set up LEDs P1OUT &= ~BIT0; P1DIR |= BIT0; P3OUT &= ~BIT6; P3DIR |= BIT6; } void InitRadio(void) { // Set the High-Power Mode Request Enable bit so LPM3 can be entered // with active radio enabled PMMCTL0_H = 0xA5; PMMCTL0_L |= PMMHPMRE_L; PMMCTL0_H = 0x00; WriteRfSettings(&rfSettings); WriteSinglePATable(PATABLE_VAL); } /************************************** * Interrupt Service Routines **************************************/ #pragma vector=TIMER0_A1_VECTOR __interrupt void TIMER0_A1_ISR(void) { switch(__even_in_range(TA0IV,14)) { case 0: break; case 2: if(receiving) { TA0CCR1 += RX_TIMER_PERIOD; // 16 cycles * 1/32768 = ~500 us pktRxHandler(); if(packetReceived) __bic_SR_register_on_exit(LPM3_bits); } else if(transmitting) { TA0CCR1 += TX_TIMER_PERIOD; // 16 cycles * 1/32768 = ~500 us pktTxHandler(); if(packetTransmit) __bic_SR_register_on_exit(LPM3_bits); } break; case 4: break; // CCR2 not used case 6: break; // Reserved not used case 8: break; // Reserved not used case 10: break; // Reserved not used case 12: break; // Reserved not used case 14: break; // Overflow not used } } #pragma vector=CC1101_VECTOR __interrupt void CC1101_ISR(void) { switch(__even_in_range(RF1AIV,32)) // Prioritizing Radio Core Interrupt { case 0: break; // No RF core interrupt pending case 2: break; // RFIFG0 case 4: break; // RFIFG1 case 6: break; // RFIFG2 case 8: break; // RFIFG3 case 10: break; // RFIFG4 case 12: break; // RFIFG5 case 14: break; // RFIFG6 case 16: break; // RFIFG7 case 18: break; // RFIFG8 case 20: // RFIFG9 if(!(RF1AIES & BIT9)) // RX sync word received { receiving = 1; __bic_SR_register_on_exit(LPM3_bits); // Exit active } else while(1); // trap break; case 22: break; // RFIFG10 case 24: break; // RFIFG11 case 26: break; // RFIFG12 case 28: break; // RFIFG13 case 30: break; // RFIFG14 case 32: break; // RFIFG15 } } #pragma vector=PORT1_VECTOR __interrupt void PORT1_ISR(void) { switch(__even_in_range(P1IV, 16)) { case 0: break; case 2: break; // P1.0 IFG case 4: break; // P1.1 IFG case 6: break; // P1.2 IFG case 8: break; // P1.3 IFG case 10: break; // P1.4 IFG case 12: break; // P1.5 IFG case 14: break; // P1.6 IFG case 16: // P1.7 IFG __delay_cycles(1000); // debounce delay buttonPressed = 1; P1IE = 0; // Debounce by disabling buttons P1IFG = 0; __bic_SR_register_on_exit(LPM3_bits); // Exit active break; } }