LAUNCHXL-CC1310: CC1310

JEnginnerHW

Part Number: LAUNCHXL-CC1310
Other Parts Discussed in Thread: CC1310

Hello everyone.
I am working on the interconnection of a RFID module through the four-wire SPI interface (CLK,MOSI,MISO,SS). A CC1310 as master.
The datasheet of my slave device specifies that the bit order of each data byte is LSB-First for writing.
I have checked the cc1310 datasheet and it is mentioned that the SPI write is MSB-first, could someone please guide me how can I make the change according to my slave device specification?

9 months ago

0 Sid 9 months ago

TI__Mastermind 20402 points

Hi,

This is the specification of the SPI peripheral itself, so the MSB first/LSB first data frame conversion cannot happen at the driver level.

Technical reference manual: www.ti.com/.../swcu117i.pdf

You could try to implement the conversion in the application level and provide inverted data to the SPI driver.

Regards,
Sid

0 JEnginnerHW 9 months ago in reply to Sid

Prodigy 110 points

unsigned char *invertir_8bit_bytes(unsigned char *x)
{
	int largoTrama = sizeof(x);

	for(int i =0;i<largoTrama;i++){
    x[i] = ((x[i] & 0x55) << 1) | ((x[i] & 0xAA) >> 1);
    x[i]= ((x[i] & 0x33) << 2) | ((x[i] & 0xCC) >> 2);
	}

    return x;

}

Hi Sid.

Thank you very much for the help, I am implementing the bit inversion from the application.

Attached is a bit-reversal function for a byte string.

Regards.

Interface

Interface forum

LAUNCHXL-CC1310: CC1310