Sending data with SPI pins

armin neamati

Other Parts Discussed in Thread: TMS320C6678

I have a custom board with TMS320C6678 and FPGA Virtex6. I want to send a random data from this DSP to the FPGA with SPI pins. I set the registers according to SPI datasheet page29. I list the registers that i set at below:

set_reg(SPI_GCR0,0x00000000);
set_reg(SPI_GCR0,0x00000001);

set_reg(SPI_GCR1 ,0x00000003);
set_reg(SPI_PC0 ,0x00000602);
set_reg(SPI_DAT1 ,0x10015555);
set_reg(SPI_FMT0 ,0x3F00FF10);
set_reg(SPI_DELAY,0xFFFF0000);
set_reg(SPI_GCR1 ,0x01000003);

set_reg(SPI_DAT0 ,0x55555555);

I want to send 0x55555555 data to FPGA and see that on chipscope but i can't see any clock or data on SPCK or MOSI pin. How can i fix this problem?

over 10 years ago

0 Raja over 10 years ago

TI__Guru* 81335 points

Hi,

please ensure that the spi registers are configured correctly with example code. please refer below thread.

http://e2e.ti.com/support/dsp/c6000_multi-core_dsps/f/639/t/211199.aspx

thank you.

0 Senthilkumar Srinivasan over 10 years ago

TI__Mastermind 43660 points

Hello Armin,

Which CS your are using ? What is the state of the CS pin when you initiate data transfer ?

I suspect the problem with SPI configuration. Please try TI provided code for SPI interface.

Regards,

Senthil

0 armin neamati over 10 years ago in reply to Senthilkumar Srinivasan

Expert 1595 points

Hello SenthilKumar
I'm using CS1 for FPGA and CS0 for SPI NOR Flash. I want to send data to FPGA so i set the first two bit of PC0 reg to "10" (set_reg(SPI_PC0 ,0x00000602);)

0 Senthilkumar Srinivasan over 10 years ago in reply to armin neamati

TI__Mastermind 43660 points

Hello Armin,

Are you able to access SPI NOR flash ?

Are you using custom code or TI provided example ? If you are using custom code, could you try with TI provided example ?

Did you ensure all the hardware connections ?

Regards,

Senthil

0 armin neamati over 10 years ago in reply to Senthilkumar Srinivasan

Expert 1595 points

Hello SenthilKumar
I am not able to access SPI NOR flash yet. Hardware connection has no problem. What is your mean about TI provided example?

0 Ganapathi Dhandapani95 over 10 years ago in reply to armin neamati

TI__Mastermind 28085 points

Hi Armin,

SPI based NOR writer driver code is available in MCSDK package, Please use this test code to validate your SPI interface.

MCSDK Path: \ti\mcsdk_2_01_02_06\tools\writer\nor\

TI provide test code support only for EVM supported NOR flash chip only. If you using other NOR flash means you need to modified the test code based on your NOR flash data manual.

Thanks,

0 armin neamati over 10 years ago in reply to Ganapathi Dhandapani95

Expert 1595 points

The code that you said is for programming NOR flash.

I don't want program NOR flash. I want to send a data from SPI module of DSP to FPGA and see this at chip-scope while this TI's test code is
suitable for programming NOR flash.

0 Senthilkumar Srinivasan over 10 years ago in reply to armin neamati

TI__Mastermind 43660 points

Hello Armin,

The intention of giving the test code is to validate the SPI hardware/interface. I would suggest you to modify this code (mainly on configuration part) for either FPGA or your SPI NOR flash and check the interface.

Regards,

Senthil

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Sending data with SPI pins