I'm using a stm32g473 and a sim7600E-H, uart not working reliably.

[TMich.1]

In my code i first setup the sim7600 using blocking mode and later switch to dma. But in blocking mode I'm having trouble receiving data over uart. Using a nucleo it sometimes works very reliably and other times doesn't work at all or it only receives the first letter. on my custom board i once was able to get at ok response but other times it was nothing or some random character. What could be the reason?

[Karl Yamashita]

Post your relevant code

[TMich.1]

sorry, here it is:

that good enough? i can put in the entire code as well if that is better

[Mohamed Aymen HZAMI]

Hello @TMich.1​,

Try to use the CubeFirmware USART with DMA example.

Mohamed Aymen

[Karl Yamashita]

There is no way to know what you're doing in SIMTransmitSetup? Post your code as a Code Snippet.

[TMich.1]

it ended up being a poor connection between chip and pcb, thank you for your help