Re: AD9833
Posted: Fri Jun 16, 2023 3:40 pm
Hi
Further to above posts I tried to get both modules running using Martin's code, again as a known good example.
Not a great success. If I had either module connected all went well but when both were connected, module 1 just went crazy. It didn't matter if I swapped CS pins. Either worked alone but when both were connected module 1 wasn't happy.
Further testing showed that the CS pin on module one was constantly held low, meaning any and all activity on the SPI pins would be getting through whether intended to or not. Looking at the module through a magnifying lens it appears there is a solder bridge behind the chip pins.
New on order.
Regards
Further to above posts I tried to get both modules running using Martin's code, again as a known good example.
Not a great success. If I had either module connected all went well but when both were connected, module 1 just went crazy. It didn't matter if I swapped CS pins. Either worked alone but when both were connected module 1 wasn't happy.
Further testing showed that the CS pin on module one was constantly held low, meaning any and all activity on the SPI pins would be getting through whether intended to or not. Looking at the module through a magnifying lens it appears there is a solder bridge behind the chip pins.
New on order.
Regards