A modified Arduino library to let mbed boards to behave as modbus slave. See readme. Tested on Nucleo F401RE.

Dependencies:   MODSERIAL ModbusSlave232 mbed mbed-rtos millis

Example code for modified arduino modbus library.

Files at this revision

API Documentation at this revision

Comitter:
AfdhalAtiffTan
Date:
Thu Jul 28 14:59:54 2016 +0000
Parent:
3:4178c25493ba
Commit message:
Reverting back to working version.

Changed in this revision

DS18B20.lib Show diff for this revision Revisions of this file
ModbusSlave232.lib Show annotated file Show diff for this revision Revisions of this file
SoftSerial.lib Show diff for this revision Revisions of this file
TSL2561_I2C.lib Show diff for this revision Revisions of this file
includes.h Show diff for this revision Revisions of this file
main.cpp Show annotated file Show diff for this revision Revisions of this file
mbed-rtos.lib Show annotated file Show diff for this revision Revisions of this file
mbed.bld Show annotated file Show diff for this revision Revisions of this file
objects_and_variables.h Show diff for this revision Revisions of this file
pin_definitions.h Show diff for this revision Revisions of this file
diff -r 4178c25493ba -r 80f3ac4b1c8b DS18B20.lib
--- a/DS18B20.lib	Thu Jul 28 14:22:56 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,1 +0,0 @@
-https://developer.mbed.org/users/AfdhalAtiffTan/code/DS18B20/#9ff078416e17
diff -r 4178c25493ba -r 80f3ac4b1c8b ModbusSlave232.lib
--- a/ModbusSlave232.lib	Thu Jul 28 14:22:56 2016 +0000
+++ b/ModbusSlave232.lib	Thu Jul 28 14:59:54 2016 +0000
@@ -1,1 +1,1 @@
-https://developer.mbed.org/users/AfdhalAtiffTan/code/ModbusSlave232/#5318159b5eab
+https://developer.mbed.org/users/AfdhalAtiffTan/code/ModbusSlave232/#35fdc7056f66
diff -r 4178c25493ba -r 80f3ac4b1c8b SoftSerial.lib
--- a/SoftSerial.lib	Thu Jul 28 14:22:56 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,1 +0,0 @@
-http://mbed.org/users/Sissors/code/SoftSerial/#a0029614de72
diff -r 4178c25493ba -r 80f3ac4b1c8b TSL2561_I2C.lib
--- a/TSL2561_I2C.lib	Thu Jul 28 14:22:56 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,1 +0,0 @@
-http://mbed.org/users/karlmaxwell67/code/TSL2561_I2C/#17fef2caa563
diff -r 4178c25493ba -r 80f3ac4b1c8b includes.h
--- a/includes.h	Thu Jul 28 14:22:56 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,10 +0,0 @@
-#include "mbed.h"
-#include "DHT.h" //humidity and air temperature
-#include "ModbusSlave232.h" //see readme, for modbus
-#include "millis.h" //see readme, for modbus
-#include "SoftSerial.h" //for co2 sensor
-#include "TSL2561_I2C.h" //for light sensor
-#include "DS1820.h" //water temp sensor
-
-#include "pin_definitions.h" //anythign related to physical pins
-#include "objects_and_variables.h" //public objs and vars
\ No newline at end of file
diff -r 4178c25493ba -r 80f3ac4b1c8b main.cpp
--- a/main.cpp	Thu Jul 28 14:22:56 2016 +0000
+++ b/main.cpp	Thu Jul 28 14:59:54 2016 +0000
@@ -1,134 +1,53 @@
-#include "includes.h"
+#include "mbed.h"
+#include "rtos.h"
+#include "ModbusSlave232.h" //see readme
+#include "millis.h" //see readme
 
-float get_EC(float temperature);
-float get_pH();
+ModbusSlave232 mbs; // Create new mbs instance
 
-void update_modbus() //check for request and update relays
-{          
-        led1 = !led1;  //for debug 
-        mbs.update(regs, MB_REGS);
+// Slave registers
+enum {        
+  MB_0,   // Register 0
+  MB_1,   // Register 1
+  MB_2,   // Register 2
+  MB_3,   // Register 3  
+  MB_4,   // Register 4  
+  MB_REGS // Dummy register. using 0 offset to keep size of array
+};
 
-        R0 = (regs[MB_9] & (0x0001<<0)); 
-        R1 = (regs[MB_9] & (0x0001<<1)); 
-        R2 = (regs[MB_9] & (0x0001<<2)); 
-        R3 = (regs[MB_9] & (0x0001<<3)); 
-        R4 = (regs[MB_9] & (0x0001<<4)); 
-        R5 = (regs[MB_9] & (0x0001<<5)); 
-        R6 = (regs[MB_9] & (0x0001<<6)); 
-        R7 = (regs[MB_9] & (0x0001<<7));
+DigitalOut led1(LED1);
+
+int regs[MB_REGS];
+
+void another_thread(void const *argument) // do stuff
+{
+    while (true) {
+        Thread::wait(100); 
+        led1 = !led1;
+    }
 }
 
 int main()
 {
-    regs[MB_9] = 0xFFFF; //force all relay off       
+    const unsigned char SLAVE = 1;
+    const long BAUD = 9600;            
+    const unsigned PARITY = 'n';
     
     startMillis(); // milliseconds (arduino like)
-    mbs.configure(SLAVE, BAUD, PARITY);
-    
-    CO2sensor.baud(9600);
-    CO2sensor.printf("\nK 2\r\n"); //set the sensor into polling mode
-    //CO2sensor.scanf(" %[^\n]", &co2string); //dummy - blocking call enable later
-            
-    lux_sensor.enablePower();
-    window_switch.mode(PullUp);
-    shell_switch.mode(PullUp);
-    water_temp.set_configuration_bits(10); //9bit of resolution so that it is faster
-        
-    modbus_updater.attach(&update_modbus, 0.1); //visit modbus every 100ms
 
-    while (true) //main thread (updates sensors' status)
-    {                                
-        led2 = !led2; //for debug        
-        
-        dht22.readData();
-        water_temp.convert_temperature(DS1820::all_devices);         //Start temperature conversion, wait until ready
-        water_temperature = water_temp.temperature('c');
-        
-        CO2sensor.printf("Z\r\n"); //request CO2 reading
-        //see: http://stackoverflow.com/questions/16447759/scanf-inside-while-loop-working-only-one-time
-        CO2sensor.scanf(" %[^\n]", &co2string); //store it in a buffer (blocking call)                                      
-        sscanf(co2string, "%*c %d", &CO2_PPM);   
-                        
-        regs[MB_0] = CO2_PPM; //air_co2
-        regs[MB_1]=  (int)100.0*dht22.ReadHumidity(); //air_humidity
-        regs[MB_2]=  (int)100.0*dht22.ReadTemperature(CELCIUS); //air_temp
-        regs[MB_3] = (int)100.0*water_temperature;//water_temp in celcius
-        regs[MB_4] = (int)100.0*get_EC(water_temperature); //water_ec 
-        regs[MB_5] = (int)100.0*get_pH(); //water_ph
-        regs[MB_6] = lux_sensor.getLux(); //light_lux
-        regs[MB_7]=  window_switch.read(); //window_switch
-        regs[MB_8] = shell_switch.read(); //shell_switch                      
-    }
-}
+    mbs.configure(SLAVE, BAUD, PARITY);
 
-//For water pH level. Taken from http://www.dfrobot.com/wiki/index.php?title=PH_meter(SKU:_SEN0161)
-float get_pH()
-{
-  float avgValue_;  //Store the average value of the sensor feedback
-  float buf_[10],temp_;
-  float phValue_;
+    Thread thread(another_thread, NULL, osPriorityNormal, DEFAULT_STACK_SIZE);
     
-  for(int i=0;i<10;i++)       //Get 10 sample value from the sensor for smooth the value
-  { 
-    buf_[i]=water_pH.read();
-    wait_ms(10);
-  }
-  for(int i=0;i<9;i++)        //sort the analog from small to large
-  {
-    for(int j=i+1;j<10;j++)
-    {
-      if(buf_[i]>buf_[j])
-      {
-        temp_=buf_[i];
-        buf_[i]=buf_[j];
-        buf_[j]=temp_;
-      }
-    }
-  }
-  avgValue_ = 0.0f;
-  for(int i=2;i<8;i++)       //take the average value of 6 center sample
-    avgValue_ += buf_[i];
+    //test values (updatable)  
+    regs[MB_0] = 0xCA1F;
+    regs[MB_1] = 0xFACE;
+    regs[MB_2] = 0xC0DE;
+    regs[MB_3] = 0x1234;
     
-  phValue_= avgValue_*5.0f/6.0f; //convert the analog into millivolt
-  return 3.5f*phValue_;  
-}
-
-
-//Water Electrical Conductivity Sensor. Taken from http://www.dfrobot.com/wiki/index.php/Analog_EC_Meter_SKU:DFR0300
-float get_EC(float temperature)
-{  
-  float avgValue_;  //Store the average value of the sensor feedback
-  float buf_[10], temp_;
-  float ECcurrent_; 
-    
-  for(int i=0;i<10;i++)       //Get 10 sample value from the sensor for smooth the value
-  { 
-    buf_[i]=water_EC.read();
-    wait_ms(10);
-  }
-  
-  for(int i=0;i<9;i++)        //sort the analog from small to large
-  {
-    for(int j=i+1;j<10;j++)
-    {
-      if(buf_[i]>buf_[j])
-      {
-        temp_=buf_[i];
-        buf_[i]=buf_[j];
-        buf_[j]=temp_;
-      }
+    while (true) //main thread
+    {                
+        mbs.update(regs, MB_REGS); // Pass current register values to mbs
+        Thread::wait(10); // not too sure if this is needed
     }
-  }
-  
-  avgValue_ = 0.0f; for(int i=2;i<8;i++) {avgValue_ += buf_[i];} //take the average value of 6 center sample (don't forget to divide!)
-  
-  float averageVoltage = avgValue_ * 5000.0f / 6.0f; //divide by 6 because to get average value   
-  float TempCoefficient_ = 1.0f + 0.0185f*(temperature - 25.0f);    //temperature compensation formula: fFinalResult(25^C) = fFinalResult(current)/(1.0+0.0185*(fTP-25.0));
-  float CoefficientVoltage_ = averageVoltage / TempCoefficient_;
-
-  if      (CoefficientVoltage_ <= 448.0f)   {ECcurrent_ = 6.84f*CoefficientVoltage_ - 64.320f;}    //1ms/cm<EC<=3ms/cm
-  else if (CoefficientVoltage_ <= 1457.0f)  {ECcurrent_ = 6.98f*CoefficientVoltage_ - 127.00f;}    //3ms/cm<EC<=10ms/cm
-  else                                     {ECcurrent_ = 5.30f*CoefficientVoltage_ + 2278.0f;}    //10ms/cm<EC<20ms/cm
-            
-  return ECcurrent_/=1000.0f;    //convert us/cm to ms/cm
 }
\ No newline at end of file
diff -r 4178c25493ba -r 80f3ac4b1c8b mbed-rtos.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-rtos.lib	Thu Jul 28 14:59:54 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed-rtos/#4c105b8d7cae
diff -r 4178c25493ba -r 80f3ac4b1c8b mbed.bld
--- a/mbed.bld	Thu Jul 28 14:22:56 2016 +0000
+++ b/mbed.bld	Thu Jul 28 14:59:54 2016 +0000
@@ -1,1 +1,1 @@
-http://mbed.org/users/mbed_official/code/mbed/builds/f9eeca106725
\ No newline at end of file
+http://mbed.org/users/mbed_official/code/mbed/builds/6c34061e7c34
\ No newline at end of file
diff -r 4178c25493ba -r 80f3ac4b1c8b objects_and_variables.h
--- a/objects_and_variables.h	Thu Jul 28 14:22:56 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,28 +0,0 @@
-//for modbus
-const unsigned char SLAVE = 1;
-const long BAUD = 9600;            
-const unsigned PARITY = 'n';
-ModbusSlave232 mbs; // Create new mbs instance
-
-Ticker modbus_updater;
-
-// Slave registers
-enum {        
-  MB_0,   // Register 0 air_co2
-  MB_1,   // Register 1 air_humidity
-  MB_2,   // Register 2 air_temp
-  MB_3,   // Register 3 water_temp 
-  MB_4,   // Register 4 water_ec 
-  MB_5,   // Register 5 water_ph
-  MB_6,   // Register 6 light_lux
-  MB_7,   // Register 7 window_switch
-  MB_8,   // Register 8 shell_switch   
-  MB_9,   // Register 9 relays    
-  MB_REGS // Dummy register. using 0 offset to keep size of array
-};
-
-int regs[MB_REGS];
-
-char co2string[32];
-int CO2_PPM;
-float water_temperature;
\ No newline at end of file
diff -r 4178c25493ba -r 80f3ac4b1c8b pin_definitions.h
--- a/pin_definitions.h	Thu Jul 28 14:22:56 2016 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,29 +0,0 @@
-//should be compatible with arduino sketch v2
-
-//leds for debug purposes
-DigitalOut led1(PA_13); 
-DigitalOut led2(PA_14);
-DigitalOut led3(PA_15);
-
-DHT dht22(D2,DHT22);
-
-DS1820 water_temp(D3);
-
-DigitalOut R0(D4);
-DigitalOut R1(D5);
-DigitalOut R2(D6);
-DigitalOut R3(D7);
-DigitalOut R4(D8);
-DigitalOut R5(D9);
-DigitalOut R6(D10);
-DigitalOut R7(D11);
-
-SoftSerial CO2sensor(D13, D12);
-
-TSL2561_I2C lux_sensor(D14, D15);
-
-AnalogIn water_pH(A0);
-AnalogIn water_EC(A1);
-
-DigitalIn shell_switch(A2);
-DigitalIn window_switch(A3);
\ No newline at end of file