Freescale Freedom Development Platform (Questions and Answers)

QUESTION

You are looking for a simple Processor Expert example to make a single channel conversion with the ADC ?

ANSWER

You can use the typical example code below or download the FRDM-KL25Z Sample Code Package available on Freescale website : www.freescale.com/FRDM-KL25Z

There is a driver example for adc16 in the folder : kl25_sc \ klxx-sc-baremetal \ src \ drivers \

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];

I tried creating a PE ADC example, but the AD1_Init generated in AD1.c reads: void AD1_Init(void)

so your example code MyADCPtr = AD1_Init((LDD_TUserData *)NULL); /* Initialize the device */

incurs both an argument error and a result void can't be used error.

I looked around a bit, and AD1_Init is actually called by PE initialization. So where do I get MyADCPtr from?

Can you redo the example?

I tried creating a PE ADC example, but the AD1_Init generated in AD1.c reads: void AD1_Init(void)

so your example code MyADCPtr = AD1_Init((LDD_TUserData *)NULL); /* Initialize the device */

incurs both an argument error and a result void can't be used error.

I looked around a bit, and AD1_Init is actually called by PE initialization. So where do I get MyADCPtr from?

Can you redo the example?

Hello Gerrit

If you want to produce a simple project using the ADC with Processor Expert,

I would recommend to download the KL25 SampleCode V4 on Freescale website HERE (direct download link),

as new release now include a project example, called TPM Demo, featuring the ADC peripheral.

- Extract the package

- Launch CodeWarrior 10.3

- Right-clik in the Codewarrior Project Explorer Panel

- Choose Import, General, Existing Projects into Workspace, Browse directory ... Kinetis-L Sample Code

- Select TPM Demo PE then Finish

If you want to access the ADC parameters, used for this project, double-clik on ProcessorExpert.Pe and Select ADC0 in the component panel.

Tricks : In Codewarrior, if you have lost some windows or if you simply want to reorganize your views, simply select "Windows", "Reset Perspective ..."

PS: don't hesitate to share with the community if this answer was helpfull to solve your issue

Thanks, I'll review the TPM Demo. I was experimenting last weekend, and used Processor Expert to set up sampling on two pins. Looked at the code it generated and was able to invoke it and achieve correct 12b sampling at 33 kHz both inputs, purely in a software loop on the FRDM-KL25Z. Pretty impressive.

I'm now going to switch from FRDM-KL25Z to KL05Z to be closer to final production part, so if you happen to be creating another example, would be nice to have it for the KL05Z as well.

  regards, Gerrit