Reading LM4F120 internal temp sensor

[Bernard 7]

Hello,

 

Here is a ino file that allow to display temperature  from LM4F120 internal sensor.

 

It is based on example from TI workbook , ported a la mode Energia.

 

Nothing spectacular. I am slowly learning ARM and I wanted to share.

 

/* Read internal temperature sensor of LM4F120 
 Stellaris Launchpad
 Example from TI LM4F120 workbook
 A la mode Energia
 */

#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "driverlib/debug.h"
#include "driverlib/sysctl.h"
#include "driverlib/adc.h"
#include "Energia.h"

unsigned long ulADC0Value[4];
volatile unsigned long ulTempAvg;
volatile unsigned long ulTempValueC;
volatile unsigned long ulTempValueF;

void  setup()
{
  Serial.begin(9600);

  SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0);
  SysCtlADCSpeedSet(SYSCTL_ADCSPEED_125KSPS); // 250
  ADCSequenceDisable(ADC0_BASE, 1);
  ADCSequenceConfigure(ADC0_BASE, 1, ADC_TRIGGER_PROCESSOR, 0);
  ADCSequenceStepConfigure(ADC0_BASE, 1, 0, ADC_CTL_TS);
  ADCSequenceStepConfigure(ADC0_BASE, 1, 1, ADC_CTL_TS);
  ADCSequenceStepConfigure(ADC0_BASE, 1, 2, ADC_CTL_TS);
  ADCSequenceStepConfigure(ADC0_BASE, 1, 3, ADC_CTL_TS | ADC_CTL_IE | ADC_CTL_END);
  ADCSequenceEnable(ADC0_BASE, 1);
}
void loop()
{  
  ADCIntClear(ADC0_BASE, 1);
  ADCProcessorTrigger(ADC0_BASE, 1);
  
  while(!ADCIntStatus(ADC0_BASE, 1, false))
  {    
  }

  ADCSequenceDataGet(ADC0_BASE, 1, ulADC0Value);
  ulTempAvg = (ulADC0Value[0] + ulADC0Value[1] + ulADC0Value[2] + ulADC0Value[3] + 2)/4;
  ulTempValueC = (1475 - ((2475 * ulTempAvg)) / 4096)/10;
  ulTempValueF = ((ulTempValueC * 9) + 160) / 5;
  Serial.println(ulTempValueC);
  delay(300);
}

Salutations.

 

Bernard

 

 

 

 

 

 

 

 

[energia 485]

Thanks for sharing. This is a great example of how to use the Stellarisware drive lib in Energia!

[sirri 28]

it is working on the first try.. thanks a lot.. 

i have a stellaris launchpad as well now

and i want to explore its abilites (especially pros against msp430's)

..

now i will test it on raspberry pi, writing a simple python code.. yay^_^

[phaseform 3]

I'm not having any luck getting this to compile for my lm4f120. Are there libraries that need to be added, if so where can I find them?! "Energia.h" was used as an example library?!
thanks!

[energia 485]

If you are using Energia 11 and get something like the below then move #include "Energia.h" to the top as the first include. The reason is that the new driverlib depends on stdint.h and stdbool.h. Energia.h includes these. As an alternative, you can also include stdbool.h and stdint.h before any of the drivelib includes.

In file included from sketch_feb01a.ino:10:0:
/Applications/Energia.app/Contents/Resources/Java/hardware/lm4f/cores/lm4f/driverlib/debug.h:49:41: error: 'uint32_t' has not been declared
In file included from sketch_feb01a.ino:11:0:
/Applications/Energia.app/Contents/Resources/Java/hardware/lm4f/cores/lm4f/driverlib/sysctl.h:614:8: error: 'uint32_t' does not name a type
/Applications/Energia.app/Contents/Resources/Java/hardware/lm4f/cores/lm4f/driverlib/sysctl.h:615:8: error: 'uint32_t' does not name a type
/Applications/Energia.app/Contents/Resources/Java/hardware/lm4f/cores/lm4f/driverlib/sysctl.h:616:8: error: 'uint32_t' does not name a type
/Applications/Energia.app/Contents/Resources/Java/hardware/lm4f/cores/lm4f/driverlib/sysctl.h:617:37: warning: 'SysCtlPeripheralPresent' initialized and declared 'extern' [enabled by default]
/Applications/Energia.app/Contents/Resources/Java/hardware/lm4f/cores/lm4f/driverlib/sysctl.h:617:37: error: 'uint32_t' was not declared in this scope
/Applications/Energia.app/Contents/Resources/Java/hardware/lm4f/cores/lm4f/driverlib/sysctl.h:618:35: warning: 'SysCtlPeripheralReady' initialized and declared 'extern' [enabled by default]
/Applications/Energia.app/Contents/Resources/Java/hardware/lm4f/cores/lm4f/driverlib/sysctl.h:618:35: error: 'uint32_t' was not declared in this scope
/Applications/Energia.app/Contents/Resources/Java/hardware/lm4f/cores/lm4f/driverlib/sysctl.h:619:37: error: variable or field 'SysCtlPeripheralPowerOn' declared void
/Applications/Energia.app/Contents/Resources/Java/hardware/lm4f/cores/lm4f/driverlib/sysctl.h:619:37: error: 'uint32_t' was not declared in this scope
/Applications/Energia.app/Contents/Resources/Java/hardware/lm4f/cores/lm4f/driverlib/sysctl.h:620:38: error: variable or field 'SysCtlPeripheralPowerOff' declared void
/Applications/Energia.app/Contents/Resources/Java/hardware/lm4f/cores/lm4f/driverlib/sysctl.h:620:38: error: 'uint32_t' was not declared in this scope
/Applications/Energia.app/Contents/Resources/Java/hardware/lm4f/cores/lm4f/driverlib/sysctl.h:621:35: error: variable or field 'SysCtlPeripheralReset' declared void
/Applications/Energia.app/Contents/Resources/Java/hardware/lm4f/cores/lm4f/driverlib/sysctl.h:621:35: error: 'uint32_t' was not declared in this scope
/Applications/Energia.app/Contents/Resources/Java/hardware/lm4f/cores/lm4f/driverlib/sysctl.h:622:36: error: variable or field 'SysCtlPeripheralEnable' declared void
/Applications/Energia.app/Contents/Resources/Java/hardware/lm4f/cores/lm4f/driverlib/sysctl.h:622:36: error: 'uint32_t' was not declared in this scope
........
sketch_feb01a.ino: In function 'void setup()':
sketch_feb01a.ino:24:44: error: 'SysCtlPeripheralEnable' was not declared in this scope
sketch_feb01a.ino:25:44: error: 'SysCtlADCSpeedSet' was not declared in this scope
sketch_feb01a.ino:26:34: error: 'ADCSequenceDisable' was not declared in this scope
sketch_feb01a.ino:27:62: error: 'ADCSequenceConfigure' was not declared in this scope
sketch_feb01a.ino:28:55: error: 'ADCSequenceStepConfigure' was not declared in this scope
sketch_feb01a.ino:32:33: error: 'ADCSequenceEnable' was not declared in this scope
sketch_feb01a.ino: In function 'void loop()':
sketch_feb01a.ino:36:27: error: 'ADCIntClear' was not declared in this scope
sketch_feb01a.ino:37:35: error: 'ADCProcessorTrigger' was not declared in this scope
sketch_feb01a.ino:39:42: error: 'ADCIntStatus' was not declared in this scope
sketch_feb01a.ino:43:47: error: 'ADCSequenceDataGet' was not declared in this scope

[sexton 0]

The code below works in Energia 10,compiles in 11 but does nothing.Can anyone tell why?

 

 

 

/* Read internal temperature sensor of LM4F120 


 Stellaris Launchpad

 Example from TI LM4F120 workbook

 A la mode Energia

 */

#include "Energia.h"

#include "inc/hw_memmap.h"

#include "inc/hw_types.h"

#include "driverlib/debug.h"

#include "driverlib/sysctl.h"

#include "driverlib/adc.h"





unsigned long ulADC0Value[4];

volatile unsigned long ulTempAvg;

volatile unsigned long ulTempValueC;

volatile unsigned long ulTempValueF;

volatile unsigned long tt;

volatile unsigned long tc;

void  setup()

{

  Serial.begin(9600);

  pinMode(RED_LED, OUTPUT);

  pinMode(GREEN_LED, OUTPUT);

  pinMode(BLUE_LED, OUTPUT);



  SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0);

  SysCtlADCSpeedSet(SYSCTL_ADCSPEED_125KSPS); // 250

  ADCSequenceDisable(ADC0_BASE, 1);

  ADCSequenceConfigure(ADC0_BASE, 1, ADC_TRIGGER_PROCESSOR, 0);

  ADCSequenceStepConfigure(ADC0_BASE, 1, 0, ADC_CTL_TS);

  ADCSequenceStepConfigure(ADC0_BASE, 1, 1, ADC_CTL_TS);

  ADCSequenceStepConfigure(ADC0_BASE, 1, 2, ADC_CTL_TS);

  ADCSequenceStepConfigure(ADC0_BASE, 1, 3, ADC_CTL_TS | ADC_CTL_IE | ADC_CTL_END);

  ADCSequenceEnable(ADC0_BASE, 1);

}

void loop()

{  

  ADCIntClear(ADC0_BASE, 1);

  ADCProcessorTrigger(ADC0_BASE, 1);



  while(!ADCIntStatus(ADC0_BASE, 1, false))

  {    

  }



  ADCSequenceDataGet(ADC0_BASE, 1, ulADC0Value);

  ulTempAvg = (ulADC0Value[0] + ulADC0Value[1] + ulADC0Value[2] + ulADC0Value[3] + 2)/4;

  ulTempValueC = (1475 - ((2475 * ulTempAvg)) / 4096);

  ulTempValueF = ((ulTempValueC * 9) + 160) / 5;

  Serial.println(ulTempValueC);

  for (int tc =1;tc <=ulTempValueC/100;tc ++)

    dot();



  tt=ulTempValueC%100;



  for (int ttt =1;ttt <=abs(tt/10);ttt ++)

    gdot();

  for (int tc =1;tc <=ulTempValueC%10;tc ++)

    bdot();

  delay(3000);



}



void dot()

{

  digitalWrite(RED_LED, HIGH);

  delay(250);

  digitalWrite(RED_LED, LOW);

  delay(250);

}

void gdot()

{

  digitalWrite(GREEN_LED, HIGH);

  delay(250);

  digitalWrite(GREEN_LED, LOW);

  delay(250);

}

void bdot()

{

  digitalWrite(BLUE_LED, HIGH);

  delay(250);

  digitalWrite(BLUE_LED, LOW);

  delay(250);

}

[energia 485]

Odd, this should work as it worked on Energia 10. It seems to hang after ADCSequenceDisable(ADC0_BASE, 0);

I will have to look into this with a debugger.

[yezo 1]

I added this:

 

    SYSCTL_RCGC0_R |= SYSCTL_RCGC0_ADC0;  

    ROM_ADCHardwareOversampleConfigure(ADC0_BASE, 64);

 

Before the ADCSequenceDisable line and it works ok.