Calling a variable through combining prefix and integer?

Development Boards Artemis
1

I can’t google for things I likely don’t yet know the terminology for, so it’s kind of difficult to explain what I want to do;

  • I have three arrays, named PMP1, PMP2, and PMP3

  • I want to call the correct array based on a given integer.

  • The prefix is “PMP” and int pumpid is 1; how do I use this to call array PMP1?

code snippet;

typedef struct

{

unsigned int PMPdosage = 30; // Dosage in ml.

unsigned int PMPremaining = 480; // Capacity remaining.

unsigned int PMP_speed = 1000; // Runtime needed for 1ml.

byte PMP_Time1[2] = { 00,00 }; // First dosing time.

byte PMP_Time2[2] = { 25,00 }; // Second dosing time.

byte PMP_Days1[7]{ 0,0,0,0,0,0,0 }; // First dosing days.

byte PMP_Days2[7]{ 0,0,0,0,0,0,0 }; // Second dosing days.

} PMP1, PMP2, PMP3;

void Pumpcmd(byte cmd, byte pumpid, unsigned int ml)

{

// THIS IS WHERE IM HAVING TROUBLE:

if(cmd == 3) PMP+pumpid.PMP_dosage = ml

}

2

Just turn your pumps into an array.

struct PumpDetails {
  unsigned int PMPdosage    = 30;                  // Dosage in ml.
  unsigned int PMPremaining = 480;                 // Capacity remaining.
  unsigned int PMP_speed    = 1000;                // Runtime needed for 1ml.
  byte         PMP_Time1[2] = {00, 00};            // First dosing time.
  byte         PMP_Time2[2] = {25, 00};            // Second dosing time.
  byte         PMP_Days1[7]{0, 0, 0, 0, 0, 0, 0};  // First dosing days.
  byte         PMP_Days2[7]{0, 0, 0, 0, 0, 0, 0};  // Second dosing days.
};

PumpDetails PMP[3];

void Pumpcmd(byte cmd, byte pumpid, unsigned int ml) {
  
  if (cmd == 3) PMP[pumpid-1].PMPdosage = ml; // subtract 1 because array starts at 0
}
3

I can’t edit my post, but please subtract 1 rather than add one to the array index. The last code line should read “if (cmd == 3) PMP[pumpid-1].PMPdosage = ml; // add 1 because array starts at 0”

4

Sorry you can’t edit your post. Not sure what settings we have in this forum. But anyway I fixed it and changed “add” to “subtract” in the comment