nrf51822 + temp sensor problem spi rx

[kimtuna]

Hello.

I use nrf51822 EK and TN-901 temp sensor. My plan is nrf51822 slave, TN-901 is master or considering the roles reverse. Getting value is spi and output is uart. But i don't know how to get value in spi. Upload my source and sheet.

Please advise.

Thank you.

TN-901_Datasheet.pdf

spi_master.zip

[FormerMember]

I think it will be easier if you use the spi_master.c and .h files that is in the SDK. With this you could do something like this

#include "spi_master.h"
#include "simple_uart.h"
#include "spi_master_config.h"
#include "nrf_delay.h"
main(){
    simple_uart_config( required parameters );
    spi_master_init( required parameters );
    while(1){
        spi_master_tx_rx( parameters );
        spi_master_tx_rx( parameters );    //Receive MSB here
        spi_master_tx_rx( parameters );    //Receive LSB here
        spi_master_tx_rx( parameters );    
        spi_master_tx_rx( parameters );

        character string with MSB and LSB with required formatting
        simple_uart_put_string( temp_string ); 
        nrf_delay_ms(1000);
    }
}

With this you need not touch any registers in main and the code is more elegant. Hope this helps, Prithvi

[kimtuna]

Thank u Prithvi, the temp sensor to generate a frequency of 2kHz, so I want to slave way.. What should I do? I want receive only..

[FormerMember]

The datasheet is horribly insufficient. A bit of Googling lead me to this - http://forum.arduino.cc/index.php?topic=84705.0 Which means the code that is in my last post isn't needed. I would use GPIO interrupt because the interface isn't actually SPI. The Arduino code provided in the link would help you.