[MSP430F550x based frequency meter]

Hello

I am working whit msp432 and trying to measure frequency like you, but i have problem with the result, i can't measure more than 32888 Hz and i don't know the problem.

 

 

Would it be possible a little help? someone can see the problem?

 

 

My code is a Energia sketch:

#include <driverlib.h>

volatile uint32_t R10=0;
volatile uint32_t R20=0;
volatile uint32_t Cont=0;

const Timer_A_CaptureModeConfig captureModeConfig =
{
        TIMER_A_CAPTURECOMPARE_REGISTER_1,        // CC Register 1
        TIMER_A_CAPTUREMODE_RISING_EDGE,          // Rising Edge
        TIMER_A_CAPTURE_INPUTSELECT_CCIxB,        // CCIxB Input Select
        TIMER_A_CAPTURE_SYNCHRONOUS,              // Synchronized Capture
        TIMER_A_CAPTURECOMPARE_INTERRUPT_ENABLE,  // Enable interrupt
};
void TA1_0_IRQHandler(void)
{
  MAP_Timer_A_clearCaptureCompareInterrupt(TIMER_A1_BASE, TIMER_A_CAPTURECOMPARE_REGISTER_0); //clear
  R10++;
}

void TA2_0_IRQHandler(void)
{
  MAP_Timer_A_clearCaptureCompareInterrupt(TIMER_A2_BASE, TIMER_A_CAPTURECOMPARE_REGISTER_1); //clear
  R20++;
}

  
void setup()
{

  Serial.begin(9600);

  MAP_PCM_setPowerState(PCM_LPM0_DCDC_VCORE1);
  MAP_CS_initClockSignal(CS_SMCLK,CS_HFXTCLK_SELECT,CS_CLOCK_DIVIDER_4);      //Set system clock 12 MHz


  //Set GPIO 4.2 as timer
  MAP_GPIO_setAsPeripheralModuleFunctionInputPin(GPIO_PORT_P4, GPIO_PIN2, GPIO_PRIMARY_MODULE_FUNCTION);

  // Timer TA1 SMCLK/1
  TA1CTL = TASSEL_2;
  TA1CCTL0 = CCIE;
  TA1CCR0 = 60000;

  // Timer TA2 capture mode (CC Register 1, Rising Edge, CCIxB Input Select, Synchronized Capture, Enable interrupt)
  MAP_Timer_A_initCapture(TIMER_A2_BASE, &captureModeConfig);
  
  //Register interrupts
  MAP_Timer_A_registerInterrupt(TIMER_A2_BASE,TIMER_A_CCRX_AND_OVERFLOW_INTERRUPT, TA2_0_IRQHandler);
  MAP_Timer_A_registerInterrupt(TIMER_A1_BASE,TIMER_A_CCR0_INTERRUPT, TA1_0_IRQHandler);
 }

  
void loop()
{
  Serial.print(R20); //Timer A2 count
  Serial.print(" ");
  Serial.println(R10*60000);
  Serial.println(Cont);
  
  R10 = 0;
  R20 = 0;
  TA1R = 0; // clear timer counter
  TA2R = 0; // clear timer counter

  MAP_Timer_A_startCounter(TIMER_A2_BASE, TIMER_A_CONTINUOUS_MODE); //Star timers
  MAP_Timer_A_startCounter(TIMER_A1_BASE, TIMER_A_UP_MODE);
  
  while (R10 !=200 ){} // wait

  TA2CTL &= ~MC0; // stop timers
  TA1CTL &= ~MC1;
}
 

If i get to measure frequency before that your replies, i will share the code with everyone.

I will be working.

 

Thank you for all.

Regards.

[[Energia Library] Hardware Counter Library for MSP430]

Hello.

I have a quartz oscillator with fo=1.6 MHz and I have changed it features and now it band width is around 20 kHz. For this, i need to a good precision.

I am using the board msp430fr6989.

 

My code is the next:

#include <CounterLib_t.h>

Counter<CL_TimerB0> MyCounter; //pin P2.0

void setup() {
  MyCounter.start(CL_Div2); // 2 pulses 
  Serial.begin(9600);
}

void loop()
{
    MyCounter.reset();
    delay(1000);
    Serial.print((MyCounter.read()+32767.5*23)*2+32800);  //32765.5 = 65535/2          **CL_Div2**
                                                          //(MyCounter.read()+...)*2   **CL_Div2**
                                                          //32800 manual calibrate 
    Serial.println(" Hz");
    Serial.println(cont);
    delay(1000);
   }

With this code i get:

- From frequency generator: F=1.58 MHz     -> Measure with the board: F=1579589 Hz     -> Error: 0.026%

- From frequency generator: F=1.6 MHz       -> Measure with the board: F=1600093 Hz     -> Error: 0.0058%

- From frequency generator: F=1.62 MHz     -> Measure with the board: F=1620377 Hz     -> Error: 0.023%

 

The total BW is 127000 Hz

- From 1,542 MHz with error=0.077% to 1,669 MHz with error=0,074

 

For my proyect is a good precision.

 

I put images like a sample.

 

[Help with Frequency Meter, TivaC]

Hello.

 

I need to measure a frequency from output VCO with a Timer, this frequency is between 1 MHz and 2 MHz.

 

Whit my other board i don't have any problem because i can use de library ''CounterLib'' for MSP430 with Energia.

 

Can i use any library for TivaC for use like a ''CounterLib'' with Energia?

 

Best Regard.

 

P.C.

 

[Change resolution PWM with msp430FR6989]

 

You can use analogResolution() to set the PWM resolution. Note that this is tied with the analogFrequency() by default it is set to ~490 Hz (F_CPU/490).

This means that for the MSP430FR6989 running at 16 Mhz the max you can count up to is 16 MHz/490 = 32653 which is your max resolution.

 

e.g.

#define PWM_PIN 11
#define PWM_FREQ 490 // the default
#define PWM_RES (F_CPU / PWM_FREQ)


void setup() {
  /* set the PWM frequency */
  analogFrequency(PWM_FREQ);
  /* set the PWM resolution */
  analogResolution(PWM_RES);
  /* 490 Hz / 50% duty cycle on pin 11 */
  analogWrite(11, PWM_RES/2); 
}

void loop() 

Thanks you very much. it was what i want.

[Change resolution PWM with msp430FR6989]

Hello.

 

I am trying to change the output PWM resolution in my board for feed a VCO .

With enegia i can use 8 bits resolution but in the datasheet i can see that the output PWM resolution is 16 bits.

 

I have read this Topic http://forum.43oh.com/topic/5765-analogwrite-precision-question/ they use PWMWrite(Pin,Steps,duty cycle,Frequency) but, with msp430 it does not work.

 

There are any solution to increase the resolution of PWM output for msp430 like in Tiva C?

 

 

Best Regards.

P.C.