52840 SPI MISO Buffer empty

[Wenne]

Hallo,

I'm using a 52840dongle.

Uart ( PC-Terminal Debugging)

Radio ( reading 51822)

I2C Display

is working well

 No i need to write and read data to/from a spi eeprom.

I am able to write data to the EEprom and read these data from the EEprom ( I can see the correct read out data on the oscilloscope). 

But the receive Buffer m_rx_buf[0],  m_rx_buf[1],  m_rx_buf[2],  m_rx_buf[3],  m_rx_buf[4],  m_rx_buf[5],  m_rx_buf[6],  m_rx_buf[7],  m_rx_buf[8] ... is always 0.

The spim_event_handler  is working well.

maybe the mosi gpi port is not properly set to input ?

I assume that  nrf_gpio_cfg_input(miso_pin, (nrf_gpio_pin_pull_t)NRFX_SPIM_MISO_PULL_CFG); is correct too.

Do you have any idea ?

Best regards Wenne

  

[Wenne]

Oh really !!! - in the electrical sheet of the 52840 dongle it seems that pin 0.09 is free to use - i will check that on Monday !

Yes i need to read 1 byte of data only - it's a "old" 8bit eeprom  ( 25LC640 )

i have tried several different numbers of data, just to see the differencies on the oscilloscope ...

Thank you very much !!!

 

[Jørgen Holmefjord]

Yes, the pin is not connected to other peripherals on the dongle, but the firmware still needs to configure the pin for use as GPIO and not NFCT interface by setting the mentioned preprocessor symbol.