TM4C123 Launchpad - ADC enable issue

Hi,

What sequencer did you enabled to work with your ADC?

Normally, when configuring ADC, first disable all sequencers, make configurations and then enable the sequencer and the ADC.

Hi,

Not exactly sure what you mean by that statement but here is my full section of ADC code.

SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC1);
while(!(SysCtlPeripheralReady(SYSCTL_PERIPH_ADC1)));
ADCSequenceConfigure(ADC1_BASE, 0, ADC_TRIGGER_PROCESSOR, 0);
ADCSequenceStepConfigure(ADC1_BASE, 0, 0, ADC_CTL_TS | ADC_CTL_IE | ADC_CTL_END);
ADCSequenceEnable(ADC1_BASE, 0);
ADCIntClear(ADC1_BASE, 0);

However if I leave while(!(SysCtlPeripheralReady(SYSCTL_PERIPH_ADC1))); in the code never drops to the next line.  But if I leave it out I get a Bus Fault on the ADCSequenceConfigure step.  That order of code comes directly out of the Examples in the workshops.  I have no other ADC code in the entire module except where I was attempting to read it which execution never gets to.  I have however got timer modules and ssi modules in use.  Any chance of these conflicting?

Thanks

Warwick

Hi,

   You are lacking these code lines below. Search this forum for ADC initialization codes.

   SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOX);

   GPIOPinTypeADC(GPIO_PORTX_BASE, GPIO_PIN_X );

- kel

Hi,

I couldn't find anywhere that it lists the pin and peripheral for the internal temperature. I presumed that the workshops for the Tiva C would have been correct..

I will try to help you more after I get home.

- kel

Hi Warwick,

Why did you use ADC1 when at Lab 5 Workshop uses ADC0? Have you tried the Lab 5 Workshop as is?

software-dl.ti.com/.../TM4C123G_LaunchPad_Workshop_Workbook.pdf

- kel

Hi Markel,

I have tried it both ways. That was probably one of my many attempts to get it working in any way that I can. I have however now just added it to the entire lab 5 into a standalone project and it works fine. So it must be something else that I'm already using. I wonder if the Temperature Sensor peripheral shares something else or if there is a particular clock setting that I need. I will do a little more experimentation.

Hi Markel,

So I changed things and ended up putting all of this at the start of my main function.

I still get a fault between the start of this block and the end:

InitConsole();
ArtisanInterface Interface;
SysCtlClockSet(SYSCTL_SYSDIV_2_5 | SYSCTL_USE_PLL| SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);
//Set ADC up for internal temp.
SysCtlPeripheralEnable(SYSCTL_PERIPH_ADC0);
//while(!(SysCtlPeripheralReady(SYSCTL_PERIPH_ADC0)));
ADCSequenceConfigure(ADC0_BASE, 1, ADC_TRIGGER_PROCESSOR, 0);
ADCSequenceStepConfigure(ADC0_BASE, 1, 0, ADC_CTL_TS | ADC_CTL_IE |
ADC_CTL_END);
ADCSequenceEnable(ADC0_BASE, 1);
ADCIntClear(ADC0_BASE, 1);

Below this comes my while loop for measuring it all.

Mark this post as "Answered", if you already made your ADC code to work.

- kel