TMS320F28335: Send data to AD5344 by xintf

user5624527

Part Number: TMS320F28335

Hi, I have an evaluation circuit board on which TMS320F28335 and a Digital-to-Analog chip - AD5344 are connected with each other by xintf. Which block should I choose to fulfill this function? I have the external addresses of AD5344, which one of them is 0B0000H, and this address is located in xintf zone 6. should I use the block "Memory Copy"? I have tried it, but the generated code correspond to this block is automatically assigned in the "Model Initialize Function", which is executed only once. I want to send data to AD5344 by xintf during whole the process. How can I do it?

I use ccs6.1 and matlab 2017a on my computer, and XDS200 emulator.

Best regards

K.K

over 8 years ago

0 Hareesh Janakiraman over 8 years ago

TI__Guru* 95315 points

Looking at memory map in the datasheet (Fig 6-23, page 159 of SPRS439N), zone 6 is from 0x10 0000 - 0x1F FFFF. Address 0xB0000 is actually "Reserved". Please double-check the address mapping in your evaluation board. Looking at the register mapping of the AD5344 device, it appears there are only 4 registers (for the 4 DACs) that you need to write to. Perhaps you could try the below (an XINTF address of 0x100000 is used):

volatile unsigned int *memval;

int memory_value = 0x1234;

memval = (unsigned int *)0x100000; // Write address

*memval = memory_value;

(or)

*(volatile unsigned int *)0x100000 = (unsigned int)0x1234;

I didn’t try this on silicon, so please check the syntax.

0 venkatesh chilapur over 8 years ago in reply to Hareesh Janakiraman

Mastermind 6460 points

Hi,

Please ensure the sample time in the memory copy block is not set to 'inf' as this would generate the code one during init.

Under the 'Destination' tab of the block parameter pane, please update the sample time to the rate at which data should be copied.

You can also choose to write '-1' to default to model sample rate.

0 user5624527 over 8 years ago in reply to Hareesh Janakiraman

Intellectual 800 points

Thank you for your response.
I apologize for having given you the wrong xintf address. The address of the first register in AD5344 should be 0x1B0000. That address is the one which I have tried and failed many times before. I know exactly how to use xintf by writting c code. What I want to know is how to automatically generate the corresponding c code by using the blocks in Simulink. That's the purpose of model base design(MBD). Do you have any idea about that？

0 venkatesh chilapur over 8 years ago in reply to user5624527

Mastermind 6460 points

Hi,

In the memory copy block there is provision to write customer code before and after the memory copy operation.
These options are available under the 'options' tab.
You may also provide the snippet of the code to better understand the use case.

0 user5624527 over 7 years ago in reply to venkatesh chilapur

Intellectual 800 points

Hi.
and I want to know the method to access xintf by model based design of Simulink, not the method by c code. I am waiting for your suggestion.

0 user5624527 over 7 years ago in reply to venkatesh chilapur

Intellectual 800 points

Dear venkatesh chilapur:
Would please give me the method to access xintf by model based design of Simulink, not the method by c code. I am waiting for your suggestion.

0 user5624527 over 7 years ago in reply to Hareesh Janakiraman

Intellectual 800 points

Dear Hareesh J:
Would please give me the method to access xintf by model based design of Simulink, not the method by c code. I am waiting for your suggestion.

0 Hareesh Janakiraman over 7 years ago in reply to user5624527

TI__Guru* 95315 points

K.K,

I regret Simulink is not my area of expertise. You need to be assisted by Mathworks here.

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TMS320F28335: Send data to AD5344 by xintf