emu_autotemp.c

// This program will emulate the autotemp
// compile: gcc emu_autotemp.c -o emu_autotemp
#include <unistd.h>				//Needed for I2C port
#include <fcntl.h>				//Needed for I2C port
#include <sys/ioctl.h>			//Needed for I2C port
#include <linux/i2c-dev.h>		//Needed for I2C port
#include <stdio.h>

#define	I2C_ADDRESS	0x40	// 0x80 = the SVM USB

const char AUTOTEMP_DATALOG[186] = {0x82, 0xA4, 0x01, 0x01, 0xB4, 0x03, 0x02, 0x00, 0x00, 0x00, 0x0A, 0x08, 0x80, 0x08, 0x34, 0x00, 0x00, 0x00, 0x08, 0x62, 0x07, 0x08, 0x00, 0x00, 0x00, 0x08, 0x48, 0x07, 0xD0, 0x00, 0x00, 0x00, 0x08, 0x53, 0x08, 0x34, 0x0A, 0x00, 0x06, 0x08, 0xAC, 0x08, 0x34, 0x00, 0x00, 0x00, 0x09, 0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x64, 0x00, 0x00, 0x00, 0x00, 0x64, 0x64, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x61, 0x00, 0x00, 0x06, 0x9A, 0x02, 0x52, 0x00, 0x00, 0x00, 0x70, 0x04, 0x59, 0x02, 0xFB, 0x04, 0x09, 0x04, 0x4C, 0x08, 0xBE, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x09};
const int AUTOTEMP_DATALOG_LENGTH = 186;

int SendMessage(int fd, const char *message, int length);
int ReadBytes(int fd, int length);
void PrintHelp();

#define KEY_QUESTION 63
#define KEY_R 114
#define KEY_S 115
#define KEY_0 48
#define KEY_5 53
#define KEY_6 54
#define KEY_X 120
#define KEY_D 100	// datalog
#define KEY_A 97	
#define KEY_C 99	
#define KEY_I 105	
#define KEY_V 118 	
#define KEY_O 111	

int main()
{
	int file_i2c;

	//----- OPEN THE I2C BUS -----
	char *filename = (char*)"/dev/i2c-1";
	if ((file_i2c = open(filename, O_RDWR)) < 0)
	{
		//ERROR HANDLING: you can check errno to see what went wrong
		printf("Failed to open the i2c bus");
		return -1;
	}
	
	int addr = I2C_ADDRESS;          //<<<<<The I2C address of the slave
	if (ioctl(file_i2c, I2C_SLAVE, addr) < 0)
	{
		printf("Failed to acquire bus access and/or talk to slave.\n");
		//ERROR HANDLING; you can check errno to see what went wrong
		return -1;
	}

	int c;
	do
	{
		printf("Emulating Autotemp. Type a command (? = help)\n");
		c = getchar();

		switch (c)
		{
		case KEY_QUESTION:
			PrintHelp();
			break;

		case KEY_D:
			if (SendMessage(file_i2c, AUTOTEMP_DATALOG, AUTOTEMP_DATALOG_LENGTH)==0)
				printf("Send message datalog\n");
			break;

		case KEY_X:
			printf("Stopping\n");
			break;
		
		default:
			printf("Unknown command\n");
			break;
		}
	} while (c!=KEY_X);
}


void PrintHelp()
{
	printf("? = Help\n");
	printf("d = Versturen datalog\n");
	printf("x = Exit\n");
}

int SendMessage(int fd, const char *message, int length)
{
	//----- WRITE BYTES -----
	// The first byte is the destination address, so can be skipped.

	int written = write(fd, message, length);
	if (written != length)		//write() returns the number of bytes actually written, if it doesn't match then an error occurred (e.g. no response from the device)
	{
		/* ERROR HANDLING: i2c transaction failed */
		printf("Failed to write message to the i2c bus. Written bytes:%d\n", written);
		return -1;
	}

	return 0;
}


int ReadBytes(int fd, int length)
{
	char buffer[60];

	//----- READ BYTES -----
	if (read(fd, buffer, length) != length)		//read() returns the number of bytes actually read, if it doesn't match then an error occurred (e.g. no response from the device)
	{
		//ERROR HANDLING: i2c transaction failed
		printf("Failed to read from the i2c bus.\n");
		return -1;
	}
	else
	{
		printf("Data read: %s\n", buffer);
		return 0;
	}
}