9 years, 1 month ago.

Serial port on ST L053R8 does not work

I have a Nuclo L053R8 board updated with the latest Firmware and a GPRS Shield V2.0. I want to send a SMS via the GPRS shield and imported the Seeed_GPRS_Shield_GSM example program. I am not able to get any response from the GPRS module. The problem seems to be the serial port on the Nucleo board. When I am sending a AT command to the serial port D0/D1 pins, there is no activity on the these pins. I have tried D7 and D8 with the same result. The jumper for the serial port on the GPRS shiled is set according to the serial port used. I have aslo tried to rename the port name for D0 and D1 to PA_3 and PA_2 respectiviely. I have tried version 92, 93, 94 and the latest version of the mbed library. The USB Serial port is disabled. I have also tried to use RawSerial. Please help.