3 wires SPI slave not supported - slave will only read

Moghul_Vasan · August 9, 2023, 7:02am

3 wires SPI slave not supported - slave will only read
what is that error

JohnnyK · August 9, 2023, 8:12am

Hello,

usually is good to share your target, Mbed OS version and some context.

However it seems it is related to STM32

ARMmbed/mbed-os/blob/13f43cce521a2b07250b8cb3865367f6e47c1019/targets/TARGET_STM/stm_spi_api.c#L678-L686


      
          if (handle->Init.Direction == SPI_DIRECTION_1LINE) {
              /*  SPI slave implemtation in MBED does not support the 3 wires SPI.
               *  (e.g. when MISO is not connected). So we're forcing slave in
               *  2LINES mode. As MISO is not connected, slave will only read
               *  from master, and cannot write to it. Inform user.
               */
              debug("3 wires SPI slave not supported - slave will only read\r\n");
              handle->Init.Direction = SPI_DIRECTION_2LINES;
          }

BR, Jan

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3 wires SPI slave not supported - slave will only read

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