I’m having an issue with a WP7504 chip. Long story short, it can’t place calls no matter what I do. Some details ahead.
I have two WP7504 chips, one I obtained earlier this year and one a few months ago. The older chip works completely fine, but the newer chip is having issues (hence why I believe it’s the chip). I have the same firmware installed on both. I have tested calling through both Legato application code (written in C) and AT commands. ATDxxxxxxxxxx; (with an actual phone number, obviously) works on the older chip, but returns “ERROR” on the newer chip. For some reason I have to add the semicolon or it returns “NO CARRIER.”
I’m using Red Pocket as the carrier with T-Mobile as the network. I have ensured that the RAT is the same on both.
Could it be that the newer chip is configured for a different carrier, or is simply bad? I have tried everything I can from a software standpoint. I have even verified that the GPIO ports are set to the same values via AT commands. Nothing seems to have any effect.
Board: mangOH Red
Firmware: SWI9X15Y_07.12.14.00 r34472 CARMD-EV-FRMWR1 2017/11/29 18:24:42
Thank you very much in advance for any insight/suggestions. Please let me know if I should provide any other information.