MSP430FR2433: MSP430FR2433 - Lowering Power Consumption

Iñigo Fernandez

Part Number: MSP430FR2433
Other Parts Discussed in Thread: MSP-FET

Hi E2E,

I have a problem with my code which is that when it enters LPM3 it consumes more than it should. As I understand it, if everything is ok, in LPM3 using ACLK, it should consume around 15uA.

In my code, every time it enters LPM3 it consumes much more than that.

Could someone take a look at my code? It might be a lot of work but I would appreciate it very much, thanks.

#include "msp430.h"

/*Constants for SPI interrupt*/
unsigned char RXData =0;
unsigned char TXData =0;


/*Nombre de los pines del despi-C02*/
#define BUSY    BIT1
#define DC      BIT2
#define RES     BIT3



/*All functions*/
void reset_modulo(void);
void escribir_comando(unsigned char comando);
void escribir_data(unsigned char data);
void delay_ms(unsigned int tiempo_milisegundos);
void configuracion_pantalla(void);
void esperar_busy(void);
void dibujar_imagen(const unsigned char* picData);
void Configuracion_SPI(void);
void timerA0_config(void);
void delay_s(unsigned int tiempo_segundos);
void PIN_config(void);


/*Image data*/
static const unsigned char gImage_ETIQUETA_entera[4736] = { /* 0X81,0X01,0X28,0X01,0X7C,0X00, */
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};



int main()
{
   WDTCTL = WDTPW | WDTHOLD;

   PIN_config();

   Configuracion_SPI();

   timerA0_config();

   PM5CTL0 &= ~LOCKLPM5;

   __enable_interrupt();

       while(1)
        {
           configuracion_pantalla();

          dibujar_imagen(gImage_ETIQUETA_entera);

          __bis_SR_register(LPM3_bits);
        }
}



void reset_modulo(void)
{
    P1OUT &= ~RES;
    delay_s(50);
    P1OUT |= RES;
    delay_s(50);

    P1OUT &= ~RES;
    delay_s(50);
    P1OUT |= RES;
    delay_s(50);

    P1OUT &= ~RES;
    delay_s(50);
    P1OUT |= RES;
    delay_s(50);
}








void escribir_comando(unsigned char comando)
{
    P1OUT &= ~DC;
    TXData = comando;
    UCA0IE |= UCTXIE;


    __bis_SR_register(LPM3_bits);
}







void escribir_data(unsigned char data)
{
    P1OUT|= DC;
    TXData=data;
    UCA0IE |= UCTXIE;


    __bis_SR_register(LPM3_bits); // Enter LPM3
}






#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=USCI_A0_VECTOR
__interrupt void USCI_A0_ISR(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(USCI_A0_VECTOR))) USCI_A0_ISR (void)
#else
#error Compiler not supported!
#endif
{
  switch(__even_in_range(UCA0IV,USCI_SPI_UCTXIFG))
  {
    case USCI_NONE: break;
    case USCI_SPI_UCRXIFG:
           RXData = UCA0RXBUF;
           UCA0IFG &= ~UCRXIFG;
           __bic_SR_register_on_exit(LPM3_bits);
           break;
    case USCI_SPI_UCTXIFG:
          UCA0TXBUF = TXData;
          UCA0IE &= ~UCTXIE;
          __bic_SR_register_on_exit(LPM3_bits);
          break;
    default: break;
  }
}







void configuracion_pantalla(void)
{
    reset_modulo();
    escribir_comando(0x04);
    esperar_busy();

    escribir_comando(0x00);
    escribir_data(0x9f);

    escribir_comando(0X50);
    escribir_data(0x97);
}






void esperar_busy(void)
{
   while((P1IN & BUSY));
}







void dibujar_imagen(const unsigned char* imagenData)
{
    unsigned int i;

        escribir_comando(0x10);
      for(i=0;i<4736;i++)
      {
      escribir_data(0xff);
      }
        escribir_comando(0x13);
      for(i=0;i<4736;i++)
      {
      escribir_data(*imagenData);
      imagenData++;
      }
      escribir_comando(0x12);
      delay_s(2000);
}








void Configuracion_SPI(void)
{
    UCA0CTLW0 |= UCSWRST;
    UCA0CTLW0 |= UCMST|UCSYNC|UCCKPL|UCMSB|UCMODE_2|UCSTEM;
    UCA0CTLW0 |= UCSSEL__SMCLK;
    UCA0CTLW0 &= ~UCSWRST;
}








void timerA0_config(void)
{
    TA0CTL |= TACLR;          //Reset TA0
    TA0CTL |= TASSEL__ACLK;  //Use ACLK as source for timer
    TA0CTL |= ID_3;          //32kHz/8=4kHz
    TA0CCTL0 &= ~CCIFG;
    TA0CCTL0 |= CCIE;        //habilitamos interrupciones en Timer_A0
}








#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector = TIMER0_A0_VECTOR
__interrupt void Timer_A (void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(TIMER0_A0_VECTOR))) Timer_A (void)
#else
#error Compiler not supported!
#endif
{
    __bic_SR_register_on_exit(LPM3_bits);
}







void delay_s(unsigned int tiempo_segundos)
{
    TA0CCR0 = (4*tiempo_segundos);
    TA0CTL = (TA0CTL&~MC_0)|MC_1;


    __bis_SR_register(LPM3_bits);

    TA0CCTL0 &= ~CCIFG;
    TA0CTL = (TA0CTL&~MC_1)|MC_0;
}







void PIN_config(void)
{
       P1DIR|=0xFD;
       P2DIR|=0xFF;
       P3DIR|=0xFF;

       P1SEL0 |= BIT4 | BIT6 | BIT7;

       P1REN |= 0x02;
       P2REN |= 0xFF;
       P3REN |= 0xFF;


       P1OUT|=0x02;
       P2OUT&=0x00;
       P3OUT&=0x00;
}

over 4 years ago

0 Jace H over 4 years ago

TI__Guru 56685 points

Hell Inigo,

If you are consuming too much current, then there is some peripheral that has not been shutdown before entering LPM and keeping one of your clocks on. Place a NOP before entering LPM3 in order to place a breakpoint there. From there you can utilize the register view in CCS to see what clocks and/or peripherals are still active.

Specifically check our the which clocks have the clock request active, then you can track down which peripherals use that clock and are keeping it on.

0 Iñigo Fernandez over 4 years ago in reply to Jace H

Prodigy 70 points

In which part of the register view do I have to look to see the clocks that are active?

0 Iñigo Fernandez over 4 years ago

Prodigy 70 points

Part Number: MSP430FR2433

Hi E2E,

I am having power consumption problems in my microcontroller. I think the cause of the problem is the pin configuration because depending on how I configure it, it consumes more or less. How should I configure the pins so that I can use them in my code and not consume anything?

The pins I need are:

- 1.4 ----> MOSI (SPI)
- 1.5 ----> SIMO (SPI) ----> I'm not using this for nothing
- 1.6 ----> SCLK (SPI)
- 1.7 ----> STE (SPI)
- 1.1 ----> INPUT
- 1.2 ----> OUTPUT
- 1.3 ----> OUTPUT

The rest of the pins I don't use for anything. Thanks in advance.

0 Jace H over 4 years ago in reply to Iñigo Fernandez

TI__Guru 56685 points

Hello Inigo,

I've merged your posts together as they are about the same subject. Please stick to utilizing this thread for further discussion on this topic.

For the clocks, please look into the Clock System (CS) chapter of the User Guide for an explanation of clock registers. to check.
Please also see section 1.6 Connection of Unused Pins for guidance on your second question.

You can also utilize the ULP Advisor (Ultra Low Power) within CCS for more tips on how to lower your power consumption. You can also utilize EnergyTrace, if you have a compatible debugger (MSP-FET or Launchpad) for additional insight on your power consumption.

0 Bruce McKenney over 4 years ago

Guru 102905 points

I ran this code on a Launchpad. When I paused it, it was not in LPM3, rather it was spinning waiting for P1.1 ("BUSY") to go low, drawing about 250uA.

When I brought P1.1 low by patching P1.1 briefly to GND, it went into LPM3 and drew about 18uA.

You probably need to describe your circuit and test sequence.

[Edit: I had removed the jumper on J11 (P1.1 LED).]

0 Iñigo Fernandez over 4 years ago in reply to Bruce McKenney

Prodigy 70 points

The black part is in LPM3, but as you can see, the power consumption is 1.14mW. It means that it consumes around 350uA using (3V3).

0 Bruce McKenney over 4 years ago in reply to Iñigo Fernandez

Guru 102905 points

You probably need to describe your circuit and test sequence.

Are you using Free Run?

0 Jace H over 4 years ago in reply to Iñigo Fernandez

TI__Guru 56685 points

If you are at around 350uA, then this tells me you are only reaching LPM0, so SMLCK is still on. Check your peripherals that are still utilizing SMLCK.

0 Iñigo Fernandez over 4 years ago in reply to Jace H

Prodigy 70 points

I turned off the smclk clock with the command "CSCTL5 |= SMCLKOFF" and it still consumes the same...

0 Jace H over 4 years ago in reply to Iñigo Fernandez

TI__Guru 56685 points

Hello,

This means there is still a peripheral that is requesting the clock, as such clock requests override what settings you have. I suggest disabling peripherals you are using that are being driven by SMCLK one at a time until you find the situation that is causing the extra current.

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MSP430FR2433: MSP430FR2433 - Lowering Power Consumption