earckens
Active Member
A pcb for 24 inputs and 48 outputs (using serial-to-parallel and parallel to serial 8-bit registers) is working flawless with its controller program.
Now I also designed a 72 inputs (72IN) board using 9 8-bits paralle-to-serial-8-bit registers based on the pcb 24IN/48OUT concept.
I adjusted the program accordingly yet this does not work. To prove that my program is ok I modified that program to work on the 24IN/48OUT pcb, only reading the inputs: that works well.
I then tested my modified program on the 72IN pcb and again not working (not reading the 24 first inputs).
So to me that proves there is an issue with the hardware of the 72IN , and/or its combination with my 72IN program.
Attached are the schematics for the 24IN/48OUT pcb and the 72IN pcb. I am at my wits end (cannot see the forrest through the trees) about this so I decied to post my question on this forum.
Please have a thorough look at my schematics, and any pointers, hints, .. are welcome.
Erik
Below here is my code for the reading of 24 inputs ony:
(EDIT: which does work on the 24IN/48OUT pcb but not on the 72IN pcb)
Now I also designed a 72 inputs (72IN) board using 9 8-bits paralle-to-serial-8-bit registers based on the pcb 24IN/48OUT concept.
I adjusted the program accordingly yet this does not work. To prove that my program is ok I modified that program to work on the 24IN/48OUT pcb, only reading the inputs: that works well.
I then tested my modified program on the 72IN pcb and again not working (not reading the 24 first inputs).
So to me that proves there is an issue with the hardware of the 72IN , and/or its combination with my 72IN program.
Attached are the schematics for the 24IN/48OUT pcb and the 72IN pcb. I am at my wits end (cannot see the forrest through the trees) about this so I decied to post my question on this forum.
Please have a thorough look at my schematics, and any pointers, hints, .. are welcome.
Erik
Below here is my code for the reading of 24 inputs ony:
(EDIT: which does work on the 24IN/48OUT pcb but not on the 72IN pcb)
C++:
#include <Auto485.h>
#include <CMRI.h>
#include <SPI.h>
#define CMRI_ADDR 0 // select the CMRI node address
#define DE_PIN 2 // Arduino pin 2 -> MAX485 DE and RE pins
#define NOP __asm__ __volatile__ ("nop\n\t") // https://forum.arduino.cc/t/very-short-delays/43445/5
#define input_groups 3 // each group = 8 input bits; if 72 inputs then = 9
// pin 74HC165
const byte LATCH_165 = 9; // LATCH pin
Auto485 bus(DE_PIN); // RS485 bus transceiver
CMRI cmri(CMRI_ADDR, 24, 0, bus); // sets up an SMINI with address 5, SMINI = 72 inputs, 0 outputs
uint8_t input_state[3];
void setup() {
Serial.begin(9600);
delay(100);
Serial.println(__FILE__);
Serial.println("DCCpp_CMRI_nopxor72-in_v5.ino");
Serial.print("C/MRI address : ");
Serial.println(CMRI_ADDR);
delay(1000);
bus.begin(57600, SERIAL_8N2); // open the RS485 bus at 57600bps
SPI.begin (); // serial data protocol used to control 74HC165
pinMode(LATCH_165, OUTPUT);
digitalWrite (LATCH_165, HIGH);
// initialize last_input_state array with current input state
digitalWrite(LATCH_165, LOW); // pulse the parallel load latch
delay(1); // wait while data loads
digitalWrite(LATCH_165, HIGH);
input_state[0] = ~(SPI.transfer(0));
input_state[1] = ~(SPI.transfer(0));
input_state[2] = ~(SPI.transfer(0));
}
void loop() {
// 1: main processing node of cmri library
cmri.process();
// 2: update inputs
digitalWrite (LATCH_165, LOW); // pulse the parallel load latch
NOP; // use the macro instead of inline assembly
NOP;
digitalWrite (LATCH_165, HIGH);
byte new_input_state[3];
new_input_state[0] = ~(SPI.transfer(0));
new_input_state[1] = ~(SPI.transfer(0));
new_input_state[2] = ~(SPI.transfer(0));
if (memcmp(new_input_state, input_state, 3) != 0) {
memcpy(input_state, new_input_state, 3);
cmri.set_byte(0, new_input_state[0]);
cmri.set_byte(1, new_input_state[1]);
cmri.set_byte(2, new_input_state[2]);
}
// 4: wait for next iteration
delay(1);
}
