API integration of PID controller

Applications, development tools, FPGA, C, WEB
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JackTheRippchen
Posts: 12
Joined: Tue Sep 26, 2017 10:55 am

API integration of PID controller

Post by JackTheRippchen » Mon Oct 16, 2017 4:12 pm

Hi,
I'm wondering whether anybody has added the PID controller to the API yet. (Reinventing the wheel is waste of time, imho.)

My final goal is to modify the PID-oscilloscope-web-app. I'd like to step the setpoint of e.g. PID11 and capture the step answer by single trigger.
At the moment, this is too difficult for me. Therefore, I prefer going little steps and try to implement this in C without any web GUI. Hence, I need to control by API.
Sincerely, JackTheRippchen

JackTheRippchen
Posts: 12
Joined: Tue Sep 26, 2017 10:55 am

Re: API integration of PID controller

Post by JackTheRippchen » Tue Oct 17, 2017 3:58 pm

Referring to the existing API files on GitHub and this register map, I'm trying to build my own pid.c/pid.h files.

current conception of pid.h:

Code: Select all

#ifndef __PID_H
#define __PID_H

#include <stdint.h>

#include "redpitaya/rp.h"

#define PID_COUNT 4
#define ADC_COUNT_MAX 8191
#define ADC_COUNT_MIN -8192

// Base Generate address
#define PID_BASE_ADDR      0x00300000
#define PID_BASE_SIZE      0x4C

typedef struct pid_control_s {
	unsigned int PID11_IntegratorReset	:1;
	unsigned int PID12_IntegratorReset	:1;
	unsigned int PID21_IntegratorReset	:1;
	unsigned int PID22_IntegratorReset	:1;
	unsigned int 						:28;
    unsigned int PID11_SP				:14;
    unsigned int 						:18;
    unsigned int PID11_Kp				:14;
    unsigned int 						:18;
    unsigned int PID11_Ki				:14;
    unsigned int 						:18;
    unsigned int PID11_Kd				:14;
    unsigned int 						:18;	
    unsigned int PID12_SP				:14;
    unsigned int 						:18;
    unsigned int PID12_Kp				:14;
    unsigned int 						:18;
    unsigned int PID12_Ki				:14;
    unsigned int 						:18;
    unsigned int PID12_Kd				:14;
    unsigned int 						:18;
    unsigned int PID21_SP				:14;
    unsigned int 						:18;
    unsigned int PID21_Kp				:14;
    unsigned int 						:18;
    unsigned int PID21_Ki				:14;
    unsigned int 						:18;
    unsigned int PID21_Kd				:14;
    unsigned int 						:18;
    unsigned int PID22_SP				:14;
    unsigned int 						:18;
    unsigned int PID22_Kp				:14;
    unsigned int 						:18;
    unsigned int PID22_Ki				:14;
    unsigned int 						:18;
    unsigned int PID22_Kd				:14;
    unsigned int 						:18;	
} pid_control_t;

int pid_Init();
int pid_Release();

int pidEnableIntReset(rp_pid_t pid);
int pidDisableIntReset(rp_pid_t pid);
int pidSetParamSP(rp_pid_t pid, float value);
int pidSetParamKP(rp_pid_t pid, float value);
int pidSetParamKI(rp_pid_t pid, float value);
int pidSetParamKD(rp_pid_t pid, float value);

#endif //__PID_H
I don't understand why "PID11 set point" offset is 0x10 (register map page 13), while offset of e.g. "Ch A amplitude scale and offset" is 0x4 (register map page 10). In both cases, 32 bit (= 4 Byte) are described before. :?:

Furthermore, all modules start at address 0x40[x]00000 (register map page 3). In e.g. generate.h, the base address is 0x00200000 instead of 0x40200000. :?:
Sincerely, JackTheRippchen

lazyoracle
Posts: 2
Joined: Tue Aug 21, 2018 8:11 am

Re: API integration of PID controller

Post by lazyoracle » Wed Oct 10, 2018 5:02 pm

Hey. Did you manage to access the PID blocks on the FPGA using the C API? I would be happy to collaborate if you are still working on this.

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