Watch Dev pack LCD API not working

iVivek

Other Parts Discussed in Thread: CC2650STK

Hi,

I followed the instructions form http://processors.wiki.ti.com/index.php/CC26xx_LCD to get the Watch dev pack working on the Sensor Tag. I am able to see the test message on the LCD. But the LCD API (devpkLcdText) only works if its used in the SensorTag_init function in the start.

I tried using the API when a key is pressed:

static void SensorTag_callback(PIN_Handle handle, PIN_Id pinId)
{
switch (pinId) {

case Board_KEY_LEFT:
    SensorTagKeys_processKeyLeft();
    devpkLcdText("Left", 2,0);

    break;

case Board_KEY_RIGHT:
    SensorTagKeys_processKeyRight();
    devpkLcdText("Right", 2,0);

But the application seems to crash when I press the key. Even if I call devpkLcdText on the last line of SensorTag_init it seems to crash.

Can someone please help ?

over 10 years ago

0 YiKai Chen over 10 years ago

Guru 735685 points

I try the same thing and have the same result.

0 YiKai Chen over 10 years ago in reply to YiKai Chen

Guru 735685 points

I get the following reply from TI. Will test it while CC2650STK is nearby.

"The function SensorTag_callback is called from within an interrupt context so you can’t do any LCD(i.e. SPI) accesses at this point. Instead I suggest you look at the file SensorTag_Keys.c, where key processing is done in the thread context. See SensorTagKeys_processEvent(), here you can use the LCD calls at will."

0 YiKai Chen over 10 years ago in reply to YiKai Chen

Guru 735685 points

I had tried to put LCD display code in SensorTagKeys_processEvent but still cannot get correct display. I will try to contact TI again.

0 iVivek over 10 years ago in reply to YiKai Chen

Intellectual 350 points

Yes, I think its not about interrupt context. It does not even work at the end of SensorTag_init but it work at the start of SensorTag_init
I am working on a custom profile which is based on SimpleBLEPeripheral and the LCD API is working fine with this profile.
May be this API is interfering with the other traffic on the SPI bus when it is used with the Sensor profile.

0 YiKai Chen over 10 years ago in reply to iVivek

Guru 735685 points

Yes, I agree with you. I think there might be something wrong with TI's patch. Anyway, I had tried to contact TI for help and hope them can reply soon.

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Watch Dev pack LCD API not working