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Found 3 results

  1. I would like to trigger the sampling from a timer, but somehow cannot find the required information about the ADC12SHS bits in the ADC12CTL1 register. The family manual tells me to look in the specific device datasheet for that information, but I can't find it there (the MSP430F5529 datasheet). Also looked into the mspware C examples, but none uses timer triggered A/D. Where should I look for that info (which timers can be used, and how to set ADC12SHS bits to use them)?
  2. Hello, I am new to MSP430 devices and learning CCS to program it. I downloaded the following code to my MSP430F5438A contoller to check its behavior. It says LED gets ON when voltage @ P6.0 is greater than half of AVcc. AVcc is 3.3V, so LED should glow when P6.0 > 1.65. But LED doesn't glow until the voltage reaches to 3.6V. Please help me out with this. // MSP430F543xA Demo - ADC12_A, Sample A0, Set P1.0 if A0 > 0.5*AVcc // // Description: A single sample is made on A0 with reference to AVcc. // Software sets ADC12SC to start sample and conversion - ADC12SC // automatically cleared at EOC. ADC12 internal oscillator times sample (16x) // and conversion. In mainloop waits in LPM0 to save power until ADC12 // conversion complete, ADC12_ISR will force exit from LPM0 in Mainloop on // reti. If A0 > 0.5*AVcc, P1.0 set, else reset. // // M Morales // Texas Instruments Inc. // June 2009 // Built with CCE Version: 3.2.2 and IAR Embedded Workbench Version: 4.2 //****************************************************************************** #include <msp430.h> int temp; int main(void) { WDTCTL = WDTPW + WDTHOLD; // Stop WDT ADC12CTL0 = ADC12SHT02 + ADC12ON; // Sampling time, ADC12 on ADC12CTL1 = ADC12SHP; // Use sampling timer ADC12IE = 0x01; // Enable interrupt ADC12CTL0 |= ADC12ENC; P6SEL |= 0x01; // P6.0 ADC option select P1DIR |= BIT0; // P1.0 output __delay_cycles(10000); while (1) { ADC12CTL0 |= ADC12SC; // Start sampling/conversion __bis_SR_register(LPM0_bits + GIE); // LPM0, ADC12_ISR will force exit __no_operation(); // For debugger } } #pragma vector = ADC12_VECTOR __interrupt void ADC12_ISR(void) { switch(__even_in_range(ADC12IV,34)) { case 0: break; // Vector 0: No interrupt case 2: break; // Vector 2: ADC overflow case 4: break; // Vector 4: ADC timing overflow case 6: // Vector 6: ADC12IFG0 temp = ADC12MEM0; if (ADC12MEM0 >= 0x7ff) // ADC12MEM = A0 > 0.5AVcc? P1OUT |= BIT0; // P1.0 = 1 else P1OUT &= ~BIT0; // P1.0 = 0 __bic_SR_register_on_exit(LPM0_bits); // Exit active CPU break; case 8: break; // Vector 8: ADC12IFG1 case 10: break; // Vector 10: ADC12IFG2 case 12: break; // Vector 12: ADC12IFG3 case 14: break; // Vector 14: ADC12IFG4 case 16: break; // Vector 16: ADC12IFG5 case 18: break; // Vector 18: ADC12IFG6 case 20: break; // Vector 20: ADC12IFG7 case 22: break; // Vector 22: ADC12IFG8 case 24: break; // Vector 24: ADC12IFG9 case 26: break; // Vector 26: ADC12IFG10 case 28: break; // Vector 28: ADC12IFG11 case 30: break; // Vector 30: ADC12IFG12 case 32: break; // Vector 32: ADC12IFG13 case 34: break; // Vector 34: ADC12IFG14 default: break; } }
  3. Jaydeep

    MSP430F5438

    Hello, I am working on a project to design LPG detection system using MSPEXP430F5438 experiment board. My sensor gives 3V output when exposed to air and gives around 5V output when exposed to LPG. My sensor should alarm when output is above 3V. I want to use ADC12 core of MSP430F5438A. I have doubts regarding ADC12 like what should be the reference level, what should be the sampling cycle etc. Any help would be appreciated.
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