Compiler/TMS320F28379D: I need help about code execution time.

Kim Jooyoung

Prodigy 30 points

Part Number: TMS320F28379D

Tool/software: TI C/C++ Compiler

Hi,

I have a question regarding code execution time.

I am testing using F2837x controlCARD R1.3 Board.

The firmware is also provided by TI.(EtherCAT)

The System Clock is set to operate at 200 MHz.

The problem is that one code runs at 50Mhz (20ns).

In the example below, it takes 20 ns to run a line of assembly.

INC *-SP[3]

The system clock is 5 ns per count and requires 4 counts.

I think something is strange, but I do not know what's wrong.

Can you give me a solution?

Thank you.

over 7 years ago

0 Nima Eskandari over 7 years ago

TI__Guru 52070 points

Have you configured the device's clocks (SYSCTL module)?

0 Kim Jooyoung over 7 years ago in reply to Nima Eskandari

Prodigy 30 points

I set the source code below.(200Mhz)

/*PLLSYSCLK = 20MHz(XTAL_OSC) * 20 (IMULT) + 0 (FMULT) / 2 (PLLCLK_BY_2)*/

InitSysPll(XTAL_OSC,IMULT_20,FMULT_0,PLLCLK_BY_2);

0 Nima Eskandari over 7 years ago in reply to Kim Jooyoung

TI__Guru 52070 points

Are you running the code from flash or RAM? have you configure the Flash Wait states?

0 Nima Eskandari over 7 years ago in reply to Nima Eskandari

TI__Guru 52070 points

Vivek Singh can you think of anything else that could cause this?

0 Vivek Singh over 7 years ago in reply to Nima Eskandari

TI__Guru** 116581 points

Let's wait to see answer from customer to your last query. If running from flash then this can happen.

0 Vivek Singh over 7 years ago in reply to Vivek Singh

TI__Guru** 116581 points

Kim, any further update on this issue?

0 Nima Eskandari over 7 years ago in reply to Vivek Singh

TI__Guru 52070 points

Kim,

If you are using FLASH make sure to use the _FLASH macro so that the Device_init (driverlib) and InitSysCtrl (bitfields) function can configure your waitstates.

If the answer does not help, please reply to this thread.

Thank you,

Nima Eskandari

C2000™︎ microcontrollers

C2000 microcontrollers forum

Compiler/TMS320F28379D: I need help about code execution time.