CC1101 CHIP STATUS BYTE

Hi,

Please see chapter 10.1 in the CC1101 data sheet

"When the header byte, data byte, or command
strobe is sent on the SPI interface, the chip
status byte is sent by the CC1101 on the SO pin."

The register access is explained in chapter 10.2

just to confirm, so whenever i sent in a header byte to read the status of a register (its contents) then cc1101 will first send in the status byte and then the content of that specific register?

regards,

abhishek

Hi,

When reading from registers, the status byte is sent on the SO pin each time a header byte is transmitted on the SI pin. In order to read a register value a dummy byte must be transmitted (in order for the SPI clokc to run), see below.

    addr |= burst_bit_val | read_bit_val;     /* set read and burst bit as wanted */

    /* send register address byte, the read/write bit is already configured */

    SPI_WRITE_BYTE(addr);

    SPI_WAIT_DONE();

    /*  Send the byte value to write.  If this operation is a read, this value

     *  is not used and is just dummy data.  Wait for SPI access to complete. */

    SPI_WRITE_BYTE(writeValue);

    SPI_WAIT_DONE();

    /*  If this is a read operation, SPI data register now contains the register

     *  value which will be returned.  */

    readValue = SPI_READ_BYTE();

There is a lot of sample code available from ti.com for CC1101.