CC2530 SPI Configuration

MengXi Li

Other Parts Discussed in Thread: SIMPLICITI

hello TI

I have this code for SPI configuration

void spi_init(void)
{
// Master Mode
PERCFG |= 0x02; // PERCFG.U1CFG = 1
P1SEL |= 0xE0; // P1_7, P1_6, and P1_5 are peripherals
P1SEL &= ~0x10; // P1_4 is GPIO (SSN)
P1DIR |= 0x10; // SSN is set as output

// Set baud rate to max (system clock frequency / 8)
// Assuming a 26 MHz crystal (CC1110Fx/CC2510Fx),
// max baud rate = 26 MHz / 8 = 3.25 MHz.
U1BAUD = 0x00; // BAUD_M = 0
U1GCR |= 0x11; // BAUD_E = 17

// SPI Master Mode
U1CSR &= ~0xA0;

// Configure phase, polarity, and bit order
U1GCR &= ~0xC0; // CPOL = CPHA = 0
U1GCR |= 0x20; // ORDER = 1

//1st priority: USART 1
P2DIR &= ~0xC0;
P2DIR |= ~0x40;

}

I checked that SCK signal with oscilloscopebut nothing happens..

what is wrong?

thanks a lot

over 14 years ago

0 GrantC over 14 years ago

TI__Expert 3940 points

MengXi,

There is some example SPI code in SimpliciTI (http://focus.ti.com/docs/toolsw/folders/print/simpliciti.html) that might be helpful. Do a search on MRFI_SPI in the source code.

0 MengXi Li over 14 years ago in reply to GrantC

Intellectual 360 points

Thanks a lot

I find the reason,now I see the signal

thanks

0 Mike McPherson over 14 years ago in reply to MengXi Li

Prodigy 20 points

can you share what the fix was?

0 MengXi Li over 14 years ago in reply to Mike McPherson

Intellectual 360 points

Hi Mike McPherson

I am new to SPI too

My problem was I just configered the SPI interface without sending or receiving any data, So there is no CLK Signal

If data is wrote into the UxDBUF , it will be send automatically and there will be out put signal

hope this can help

0 Mike McPherson over 14 years ago in reply to MengXi Li

Prodigy 20 points

thanks yes I have a clock also now!

0 Richard Schilling over 11 years ago in reply to MengXi Li

Prodigy 20 points

Hi MengXi Li ,

I'm wondering if you'd be willing to show how you set up to write data to the UxDBUF to get an output signal. I'm having the same problem as you were. Thank you.

Richard

0 Prakash Narayanan60 over 8 years ago in reply to MengXi Li

Prodigy 20 points

Hi MengXi Li,
I have the same SPI configuration as you have and i am trying to transmit the data like this

U1DBUF = 0x01;
while (!U1TX_BYTE);
U1TX_BYTE = 0;

In debug mode i am monitoing all the SFRs what i configured and everything is proper. when i put the data into U1DBUF, immediately U1TX_BYTE value is set to 1 but am not getting any clock signal output.

dono what else is wrong? thank in advance.