TMS320F2800137: PI algorithm problem

Hello Luo

It is possible that TTPLPFC_gi_out may be updated some where else after being updated by the current loop. If you want the true value of TTPLPFC_gi_out from the current loop, add a new variable immidiately after TTPLPFC_gi_out in the current loop like below:

and then look for this new variable in the expression window.

Thanks

Amir

Hello, expert！

1、I tried according to what you said, and the result is still the same. The redefined variable value is 1, indicating that the result calculated by PI has always been 1, and the breakpoint shows that the result calculated by PI is also 1

2、May I ask, how can the software in the following figure be obtained? Can you provide a connection?

Best regards!

yong

Hello Young

#define TTPLPFC_GI_PI_KP (float) 0.3496503407
#define TTPLPFC_GI_PI_KI (float) 0.0020000510

how did you make these values zero? I dont think you can change these values in setting.h file. After changing these values, did you rebuild the project? I believe these values update to original values after building because values in the setting.h file comes from mainsysconfig. I am not sure why are u getting gi_out as 1. looks like it is saturating. Can you elaborate your experiment condition?

Thanks

Amir

hi

Firstly, we will migrate the TIDM02008 program to the F2800137 environment without porting the mainsysconfig file. Instead, we will simply migrate the source and header files, as shown in the following figure:

secondly

#Define TTPLPFC_ GI_ PI_ KP (float) 0.3496503407

#Define TTPLPFC_ GI_ PI_ KI (float) 0.0020000510

The two macro definitions can be configured with values through setting. h. They have been successfully configured to 0 and will not have any impact after compilation, as shown in the following figure;

thirdly 

The experimental conditions were carried out according to the steps and conditions of Experiment 2 in the experimental guide book.

Hello Yong

Currently, I am heavily loaded with other works. So I cannot go through your code.

Since you are not using the mainsysconfig file, I believe some of the value might have changed while porting. I will suggest to do an apple to apple comparison of your code with the original TIDM 2008 code. Also, please go through DCL_runPI_C1.asm file and see how this controller calculates its output. Hopefully it will give some clue.

Thanks

Amir