/* MSP430f2013 -------------- +3,5V --|DVCC GND|-- DVSS red LED --|P1.0 P2.6|-- TXD --|P1.1 P2.7|-- RXD --|P1.2 TEST|-- TEST/SBWTCK Switch2 --|P1.3 RESET|-- RST/NMI/SBWTDIO PWM 1 --|P1.4 P1.7|-- PWM 2 --|P1.5 P1.6|-- green LED -------------- */ #include "msp430g2211.h" #include "inttypes.h" #include "stdbool.h" // MSP430g2231 Signale / PINs #define TXD BIT1 // TXD an P1.1 #define RXD BIT2 // RXD an P1.2 // Timing for the Software UART #define BitTime 104 // 9600 Baud, SMCLK=1MHz (1MHz/9600)=104 #define BitTime_5 52 // BitTime / 2 /* ---- global Variables ------------------------------------------------------------------------------------ */ uint8_t BitCnt; // BitCount for the serial output uint16_t TXByte; // TXByte sent uint16_t RXByte; // RXByte recieved uint16_t channel1; //Analog Channel1.value //P1.6 uint16_t channel2; //Analog Channel2.value //P1.7 uint16_t counter1; //PWM counter 1; uint16_t counter2; //PWM counter 2; bool digiput; //Digital Port1.0 = Channel 3 uint16_t selector; //Which channel will be the next? uint16_t selected_channel; bool isReceiving; bool hasReceived; /* ---- Prototypes ------------------------------------------------------------------------------------------- */ void putChar (uint8_t c); void main (void) { WDTCTL = WDTPW + WDTHOLD; // stop WDT BCSCTL1 = CALBC1_1MHZ; // set range DCOCTL = CALDCO_1MHZ; // SMCLK = DCO = 1MHz P1SEL |= TXD; // TXD connected @ Timer P1DIR |= TXD | BIT0 | BIT4 | BIT5; // TXD as Output, P1.0 as digital, P1.4 as channel1, P1.5 as channel2 P1IES |= RXD; // RXD Hi/lo edge interrupt P1IFG &= ~RXD; // clear RXD (flag) before enabling interrupt P1IE |= RXD; // Enable RXD interrupt channel1 = 0; channel2 = 0; counter1 = 0; counter2 = 0; digiput = false; selector = 1; selected_channel = 1; // ---- Soft. UART Timer Setup ---- CCTL0 = OUT; // TXD Idle as Mark = '1' TACTL = TASSEL_2 + MC_2; // SMCLK, continuous mode isReceiving = false; // set initial values hasReceived = false; __bis_SR_register (GIE); // interrupts enabled putChar(42); //Send ON-State while (1) { if (hasReceived) { // Char recieved ? hasReceived = false; if(selector != 2){ // clear "hasReceived" flag putChar (23); //Send ACK switch(RXByte){ case 0:{ putChar(42); }break; case 1:{ //Analog channel 1 selected_channel = 1; selector = 2; }break; case 2:{ //Analog channel 2 selected_channel = 2; selector = 2; }break; case 3:{//Digital Channel selected_channel = 3; selector = 2; }break; case 4:{ //Reset analog channel1 = 0; channel2 = 0; selector = 2; }break; case 5:{ //Reset all channel1 = 0; channel2 = 0; digiput = 1; selector = 2; }break; } }else{ switch(selected_channel){ case 1:{ channel1 = RXByte; }break; case 2:{ channel2 = RXByte; }break; case 3:{ digiput = RXByte; } } selector = 1; } } if (~hasReceived) __bis_SR_register (CPUOFF + GIE); //Handle digital output if(digiput){ P1OUT &= ~(BIT0); }else{ P1OUT |= BIT0; } //Handle analog channel 1 counter1++; if(counter1 == 0){ P1OUT |= BIT4; } if(counter1 == channel1){ P1OUT &= ~(BIT4); } if(counter1 == 255){ counter1 = 0; } //Handle analog channel 2 counter2++; if(counter2 == 0){ P1OUT |= BIT5; } if(counter2 == channel2){ P1OUT &= ~(BIT5); } if(counter2 == 255){ counter2 = 0; } } } /* ---- simple putChar --------------------------------------------------------------------------------------- */ void putChar (uint8_t c) { while (isReceiving); // Receiver busy ? BitCnt = 0xA; // BitCounter 8 BIT + Start/Stop BIT CCR0 = TAR; // Compare Register initialisieren CCR0 += BitTime; // Add up BIT time TXByte = (c |= 0x100); // Add Stop BIT to TXByte (logic 1) TXByte <<= 1; // Add Start BIT to TXByte (logic 0) CCTL0 = CCIS0 + OUTMOD0 + CCIE; // Set signal, intial value, enable interrupts while (CCTL0 & CCIE); // Wait for all BIT to be sent } /* ---- Start receive timer and disable any current transmission --------------------------------------------- */ #pragma vector=PORT1_VECTOR __interrupt void Port_1 (void) { isReceiving = true; P1IE &= ~RXD; // Disable RXD interrupt P1IFG &= ~RXD; // Clear RXD IFG (interrupt flag) TACTL = TASSEL_2 + MC_2; // SMCLK, continuous mode CCR0 = TAR; // Init Compare Register CCR0 += BitTime_5; // Add up half BIT time CCTL0 = OUTMOD1 + CCIE; // Disable TX and enable interrupts RXByte = 0; // init RXByte BitCnt = 0x9; // BitCounter 8 BIT + ST } /* ---- Timer interrupt routine, transmitting and receiving bytes. ------------------------------------------- */ #pragma vector=TIMERA0_VECTOR __interrupt void Timer_A (void) { if (!isReceiving) { CCR0 += BitTime; // Add up BIT time if (BitCnt == 0) { // If all BITs are sent CCTL0 &= ~ CCIE; // Disable interrupt } else { CCTL0 |= OUTMOD2; // TX BIT = 0 if (TXByte & 0x01) CCTL0 &= ~ OUTMOD2; // If it should be 1, set it to 1 TXByte >>= 1; BitCnt --; } } else { CCR0 += BitTime; // Add up BIT time if (BitCnt == 0) { CCTL0 &= ~ CCIE; // Disable interrupt isReceiving = false; P1IFG &= ~RXD; // clear RXD IFG (interrupt flag) P1IE |= RXD; // enable RXD interrupt if ((RXByte & 0x201) == 0x200) { // check START/STOP BIT RXByte >>= 1; // Remove START BIT RXByte &= 0xFF; // Remove STOP BIT hasReceived = true; } __bic_SR_register_on_exit (CPUOFF); // Enable CPU so the main while loop continues } else { if ((P1IN & RXD) == RXD) RXByte |= 0x400; // Set the value in RXByte If bit is set RXByte >>= 1; // Shift BIT's BitCnt --; } } }