SPI master disable recieve

[nsnyder]

So I've been using the SPI master driver supplied via the SDK. I'm currently trying to use the nrf51822 to control an LCD screen so I can display some information. I don't need to read anything from the LCD driver and my LCD refresh rate is slower than I would like. However when I go through and try to remove any use of the receive buffer in an attempt to speed up my screen refresh rate the SPI driver just stops working. Is there some way for me to do this?

Thank you

[Stian Røed Hafskjold]

Did you set the SPI master frequency to the highest? You can change the frequency when you initialize the module. Please have a look at the documentation here: developer.nordicsemi.com/.../a00012.html

I don't think removing any use of the receive buffer will actually speed up anything.

[Francesco F]

Hi guys, I'm experiencing a similar problem: I'm working with a sharp memory lcd and my code for transmission was

spi_master_send_recv(SPI_MASTER_0, linebuff, linebuff_len, NULL, 0);

For the moment it's not working.. Is that a bad idea to have put rx_buff to NULL and rx_buff_len to 0?

Thanks in advance for the hint :)

[Sebastian]

Look at SPI master driver in SDK 9.0.0 - it should support zero length RX buffer.

In case you don't want to connect MISO line, during initialization you may declare it as unused: NRF_DRV_SPI_PIN_NOT_USED.