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CC1352P: RF Packet Sniffer Firmware UART transmits garbage characters

Jim Chong
Prodigy 45 points
Part Number: CC1352P
Other Parts Discussed in Thread: UNIFLASH

Tool/software:

Hi,

I'm trying to set up a CC1352P1 or a CC1352P7 as Wi-SUN RF Sniffers to test the reliability of my network.

I've gone through the Smart RF Sniffer Installation Guide and have flashed the CC1352P1 with the `sniffer_fw.hex` file supplied by the SmartRF Packet Sniffer 2 install. The launchpad's green LED blinks every 1 second indicating the firmware was written correctly.

I then try to verify the UART communication as recommended by other posts, as I would assume it should send a message every second. However, when I connect a serial terminal to the device I get garbage characters out. I'm running at 921600 baud, 8 data bits, 1 stop bit, no parity and no flow control.

This is the output I see on PuTTy

I've tried flashing with UniFlash and Flash Programmer 2 and the result is the same. I've erased the entire unprotected memory beforehand as well and verified the contents after. I've also tried unplugging and plugging in the devices and checking the serial communication but it all has the same effect.

This is the same behaviour when I try flashing the CC1352P7 as well.

Any ideas?

Thanks,

Jim