Dear all.
I am trying to implement Modbus protocol.Previously i used Modbus library function.I found We cant send request In below format. library help to store the values and sending request and receiving request will take care itself. The code
I downloaded library from here and its working fine . but they didnt code for CRC error what should be done particular error.
Here is My Serial code without Modbus.
#include "glob.h"
const int BUFFER_SZ = 32;
char sendBuffer[200];
static int OverRide=0;
void Take_Reading() {
for (int row = 0; row < 8; row++)
{
// // get rid of me:
digitalWrite(SO_enable, array[row][0]);
digitalWrite(S1_enable, array[row][1]);
digitalWrite(S2_enable, array[row][2]);
delay(150);
analog_1_pv[row] = ANALOG_SCALING * analogRead(A0);
analog_2_pv[row] = ANALOG_SCALING * analogRead(A1);
analog_3_pv[row] = ANALOG_SCALING * analogRead(A2);
if ( (analog_1_pv[row] <= MINV_RANGE || (analog_1_pv[row] >= MAXV_RANGE) ))
{
Current_Value1[row] = 0.0;
}
else
{
Current_Value1[row] = (analog_1_pv[row] * 12.5) - 31.25;
}
if ( (analog_2_pv[row] <= MINV_RANGE || (analog_2_pv[row] >= MAXV_RANGE) ))
{
Current_Value2[row] = 0.0;
}
else
{
Current_Value2[row] = (analog_2_pv[row] * 12.5) - 31.25;
}
if ( (analog_3_pv[row] <= MINV_RANGE || (analog_3_pv[row] >= MAXV_RANGE) ))
{
Current_Value3[row] = 0.0;
}
else
{
Current_Value3[row] = (analog_3_pv[row] * 12.5) - 31.25;
}
Mod_current[row] = (uint16_t)(Mul_Factor * Current_Value1[row]);
Mod_current[row + 8] = (uint16_t)(Mul_Factor * Current_Value2[row]);
Mod_current[row + 16] = (uint16_t)(Mul_Factor * Current_Value3[row]);
}
}
int ID_Check() {
int ID_value;
for (int row = 0; row < 8; row++)
{
digitalWrite(SO_enable, array[row][0]);
digitalWrite(S1_enable, array[row][1]);
digitalWrite(S2_enable, array[row][2]);
Status_Out[row] = digitalRead(Output_Read);
}
ID_value = 1 * Status_Out[7] + 2 * Status_Out[6] + 4 * Status_Out[5] + 8 * Status_Out[4] + 16 * Status_Out[3] + 32 * Status_Out[2] + 64 * Status_Out[1] + 128 * Status_Out[0];
return (ID_value);
}
int Take_Temp_Reading()
{
Temp_Total = Temp_Total - Temp_readings[Temp_index];
Temp_readings[Temp_index] = analogRead(A5);
Temp_Total = Temp_Total + Temp_readings[Temp_index];
Temp_index = Temp_index + 1;
if (Temp_index >= numReadings)
{
Temp_index = 0;
Temp_Average = Temp_Total / numReadings;
}
temp = (Temp_Average * 5.0) / 1023.0;
// temp = float(analogRead(A5)) * 5.0 / 1024.0;
temp_int = (int)(temp * 100.0);
return (temp_int);
// Serial.print("Temp"); Serial.println(temp);
}
int SPD_Check()
{
SPD_STATUS = digitalRead(SPD_STATUS_PIN);
return (SPD_STATUS);
}
int DC_Status()
{
DC_STATUS = digitalRead(DC_STATUS_PIN);
return (DC_STATUS);
}
int Take_HV_Reading()
{
//int analog_int= analogRead(A4);
total = total - readings[index];
// read from the sensor:
readings[index] = analogRead(A4);
// add the reading to the total:
total = total + readings[index];
// advance to the next position in the array:
index = index + 1;
// if we're at the end of the array...
if (index >= numReadings1)
{
index = 0;
average = total / numReadings1;
}
else
{
HV_voltage = (average * 5.0) / 1023.0;
}
if (HV_voltage <= 0.25)
{
Conv_HV_voltage = 0.0;
}
else
{
Conv_HV_voltage = 197.837837838 * HV_voltage + 10.8108108108;
}
HV_Reading = (uint16_t)(Conv_HV_voltage * 10);
// HV_Reading = (uint16_t)(Conv_HV_voltage * 10);
return(HV_Reading);
}
void Serial_Command1()
{
Take_Reading();
int Temp_read=Take_Temp_Reading();
int HV_Read=Take_HV_Reading();
SPD=SPD_Check();
DISCONNECTOR=DC_Status();
// Device_ID=ID_Check();
Device_ID=1;
Serial.print("SMCB1");
Serial.print(",");
Serial.print(Device_ID);
Serial.print(",");
for (int i = 0; i < 14; i++) {
Serial.print(Mod_current[i]);
Serial.print(",");
}
for (int i = 23; i > 13; i--) {
Serial.print(Mod_current[i]);
Serial.print(",");
}
Serial.print(Temp_read);
Serial.print(",");
Serial.print(HV_Read);
Serial.print(",");
Serial.print(SPD);
Serial.print(",");
Serial.print(DISCONNECTOR);
Serial.print(",");
Serial.println("END");
}
void Serial_Command2(int a)
{
Take_Reading();
int Temp_read=Take_Temp_Reading();
int HV_Read=Take_HV_Reading();
SPD=SPD_Check();
DISCONNECTOR=DC_Status();
Device_ID=1;
// Serial.print("Command2 executed: ");
snprintf(sendBuffer, a, "SMCB1,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d ,END",Device_ID,
Mod_current[0], Mod_current[1], Mod_current[2], Mod_current[3],
Mod_current[4], Mod_current[5], Mod_current[6], Mod_current[7],
Mod_current[8], Mod_current[9], Mod_current[10], Mod_current[11],
Mod_current[12], Mod_current[13], Mod_current[14], Mod_current[23],
Mod_current[22], Mod_current[21], Mod_current[20], Mod_current[19],
Mod_current[18], Mod_current[17], Mod_current[16], Mod_current[15],
Mod_current[14], Temp_read, HV_Read, SPD, DISCONNECTOR);
Serial.println(sendBuffer);
//Serial.println(a);
}
void setup()
{
Serial.begin(57600);
Serial.println("Format 1: <SMCB1,1>");
Serial.println("Format 2: <SMCB1,1,Length>");
Serial.println("Format 2: <SMCB1,1,Length,ON> ON- turn on timer ,off to turn off timer");
}
// Parse the request, WITHOUT the '<' and '>' delimiters.
void parseRequest(char *request)
{
// Check the request starts with the prefix "SMCB1,1".
if (strncmp(request, "SMCB1,1", 7) != 0) {
Serial.println(F("Error: bad request prefix"));
// Serial_Command1();
return;
}
request += 7;
if (request[0] == '\0') {
//Serial.println(F("Received format 1"));
Serial_Command1();
return;
}
if (request[0] != ',') {
Serial.println(F("Error: ',' expected"));
return;
}
request++;
char * comma = strchr(request, ',');
if (!comma) {
int length = atoi(request);
Serial_Command2(length);
return;
}
int timer = atoi(request);
char * on_off = comma + 1;
char * Compare="ON";
bool on = strcmp(on_off, "ON") == 0;
if (!on && strcmp(on_off, "OFF") != 0) { // sanity check
Serial.println(F("Error: expected either ON or OFF"));
return;
}
int v = strcmp(on_off, Compare);
if(v==0)
{
Serial.println("Timer is on");
OverRide=1;
}
else
{
Serial.println("Timer is OFF");
OverRide=0;
}
}
void loop()
{
static char buffer[BUFFER_SZ]; // received chars
static size_t pos; // current position in buffer
static bool insideRequest; // are we between '<' and '>'?
//Serial.println("Loop Begin");
if (Serial.available()) {
// Serial.println("Loopsfsfsfsf executed");
char c = Serial.read();
if (insideRequest) {
if (c == '>') { // end of request received
buffer[pos] = '\0'; // terminate the string
parseRequest(buffer);
pos = 0; // get ready for the next request
insideRequest = false;
}
else if (pos < BUFFER_SZ-1) { // add char to buffer
buffer[pos++] = c;
}
}
else if (c == '<') { // start of request
insideRequest = true;
}
// Serial.println("Loop executed");
}
}
I have attached AVR c code for atmega328 with Modbus response.
Is there any code avilable written in C with implimented modbus functional code.
AVR C CODE.txt (5.16 KB)