topic Using Codewarrior and PE on FRDM board, getting ADC and DAC to work in Kinetis Microcontrollers

Using Codewarrior and PE on FRDM board, getting ADC and DAC to work

steve_fae — Sat, 01 Dec 2012 19:15:30 GMT

1. In trying to get a simple ADC function to work using adc and PE typical example code, the code doesn't compile. One variable doesn't seem to be defined.

If someone has a working PE example of a single channel conversion that would be great.

2. For a simple DAC example using CW and PE, when trying to execute

Error = dim_voltage_SetValue(MyDACDataPtr, 0xffff); which is basically sending a value to the DAC output, the debugger goes to:

PE_ISR(Cpu_Interrupt)

{

/* This code can be changed using the CPU component property "Build Options / Unhandled int code" */

PE_DEBUGHALT();

what causes this, and if its an unhandled interrupt how do I find out what caused it?

Re: Using Codewarrior and PE on FRDM board, getting ADC and DAC to work

filipsobczak — Sat, 01 Dec 2012 21:50:58 GMT

Regarding ADC. I also used the typical example code and had no trouble compiling it.

Here's my code, it's almost the same as the example code. I only altered it to work with a static sample group (here group 1).

AD1_TResultData MeasuredValue[SAMPLE_GROUP_SIZE];

LDD_TDeviceData *MyADCPtr;

LDD_TError Error;

MyADCPtr = AD1_Init((LDD_TUserData *)NULL); /* Initialize the device */

	Error = AD1_SelectSampleGroup(MyADCPtr, 1U);
	Error = AD1_StartSingleMeasurement(MyADCPtr); // Start continuous measurement
	while (!AD1_GetMeasurementCompleteStatus(MyADCPtr)) {}; // Wait for conversion completeness
	Error = AD1_GetMeasuredValues(MyADCPtr, (LDD_TData *)MeasuredValue); // Read measured values
	FsrReadings[1] = MeasuredValue[0];

Re: Using Codewarrior and PE on FRDM board, getting ADC and DAC to work

steve_fae — Sat, 01 Dec 2012 23:55:29 GMT

Thanks filipsobczak,

I can now compile. So the input is ADC0_DP0 which is PTE20 on the FRDMKL board, but the value never changes, its always 0x5ac, whether I tie the pin to P3V3 [3v] or GND. What did you set the reference to? What might I be missing? In addition I tied VREFH to P3V3 on FRDMKL board but VREFL isn't pinned out.

Thanks btw.

Re: Using Codewarrior and PE on FRDM board, getting ADC and DAC to work

filipsobczak — Sun, 02 Dec 2012 11:37:12 GMT

I'm afraid I can't help you anymore. My voltage referrence pins are VREFH and VREFL. And for further notice ADC0_DP0 is a differential channel. In single ended mode the PTE20 ADC input channel is ADC0_SE0.