CCS/F28M36P63C2: SPI baudrate- Tech ref manual

Srinivasan Venkatasubramani

Part Number: F28M36P63C2

Tool/software: Code Composer Studio

Hello,

I have a query about something i read on the Technical reference manual regarding the C28 SPI interface with regards to setting the SPI Baudrate. I am trying to SPI write to an LCD , with a transfer every 500 ms.

I am trying to decide the appropriate SPI BRR value. and i am following the below steps

#define CPU_FREQ     150E6      // 150MHz
#define SPI_BAUDRATE 2     // 2 Hz
#define LSPCLK_FREQ  (CPU_FREQ/4)
#define SPI_BRR      (LSPCLK_FREQ/SPI_BAUDRATE)-1

Is this accurate?

Thank you,

Srini

over 7 years ago

0 Marlyn Rosales Castaneda20 over 7 years ago

TI__Mastermind 26390 points

Hi Srini,
I will look into this and get back to you by tomorrow.

Best,
Marlyn

0 Srinivasan Venkatasubramani over 7 years ago in reply to Marlyn Rosales Castaneda20

Expert 1455 points

Okay, Marlyn. Thank you very much.

Srini

0 Marlyn Rosales Castaneda20 over 7 years ago in reply to Srinivasan Venkatasubramani

TI__Mastermind 26390 points

Hi Srini,

I understand that you want to send a transfer every 500ms, but you can achieve this my triggering a CPU timer interrupt every 500ms.

The SPI baudrate will be based on the speed at which you want to transfer the words. For example if you want to transfer something at 500kbps or so. The max speed you can go up to is 10Mbps in this scenario.

I would just adjust the SPI baudrate and then create an interrupt that will get triggered every 500ms.

Best Regards,

Marlyn

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CCS/F28M36P63C2: SPI baudrate- Tech ref manual