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main.c
299 lines (272 loc) · 8.81 KB
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main.c
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/*-----------------------------------------------------------------------------
/ Todo: Fill this header ...
/----------------------------------------------------------------------------*/
#include <avr/io.h>
#include <avr/wdt.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <avr/eeprom.h>
#include <avr/pgmspace.h>
/*---------------------------------------------------------------------------*/
#include "usbdrv.h"
#include "string.h"
#include "digital.h"
#include "usbRelated.h"
#include "bitbang_i2c.h"
/*---------------------------------------------------------------------------*/
#define VERSION 0x04
/*---------------------------------------------------------------------------*/
void timer_init();
void initSerialNumber();
/*---------------------------------------------------------------------------*/
uint8_t debug[3];
volatile uint8_t gainSetting;
uint8_t thermocoupleReadout[4];
uint8_t coldJunctionReadout[4];
uint8_t* EE_addr = (uint8_t*)32;
volatile uint16_t timer0_counter;
/*---------------------------------------------------------------------------*/
int usbDescriptorStringSerialNumber[] = {
USB_STRING_DESCRIPTOR_HEADER(USB_CFG_SERIAL_NUMBER_LEN),
USB_CFG_SERIAL_NUMBER
};
/*---------------------------------------------------------------------------*/
void handleMessage()
{
switch(msgbuf[1])
{
case 0: /* Version reading */
{
msgbuf[2] = 0xBB;
msgbuf[3] = 0x66;
msgbuf[4] = VERSION;
break;
}
case 1: /* ADC reading */
{
msgbuf[2] = thermocoupleReadout[0];
msgbuf[3] = thermocoupleReadout[1];
msgbuf[4] = thermocoupleReadout[2];
msgbuf[5] = thermocoupleReadout[3];
msgbuf[6] = coldJunctionReadout[0];
msgbuf[7] = coldJunctionReadout[1];
msgbuf[8] = debug[0];
msgbuf[9] = debug[1];
msgbuf[10] = debug[2];
break;
}
case 2: /* GPIO control */
{
if(msgbuf[2] == 0)
{
digitalWrite(B,1,LOW);
}
else
{
digitalWrite(B,1,HIGH);
}
break;
}
case 3: /* Change serial number */
{
eeprom_write_byte((EE_addr+0),msgbuf[2]);
eeprom_write_byte((EE_addr+1),msgbuf[3]);
eeprom_write_byte((EE_addr+2),msgbuf[4]);
eeprom_write_byte((EE_addr+3),msgbuf[5]);
eeprom_write_byte((EE_addr+4),msgbuf[6]);
eeprom_write_byte((EE_addr+5),msgbuf[7]);
eeprom_write_byte((EE_addr+6),msgbuf[8]);
eeprom_write_byte((EE_addr+7),msgbuf[9]);
eeprom_write_byte((EE_addr+8),msgbuf[10]);
eeprom_write_byte((EE_addr+9),msgbuf[11]);
break;
}
case 4: /* Change PGA setting for MCP3421 */
{
gainSetting = msgbuf[2];
break;
}
default:
{
break;
}
}
}
/*---------------------------------------------------------------------------*/
int main(void)
{
uint8_t rv;
uint8_t i = 0;
uint8_t mcp3421_addr;
uint8_t mcp9800_addr;
uint8_t tmpReadout[4];
/* Variables for cold junction moving average filter */
int16_t movAvg_read;
int8_t movAvg_ind = 0;
int32_t movAvg_sum = 0;
uint8_t movAvg_stabil = 0;
int16_t movAvg_mem[8] = {0,0,0,0,0,0,0,0};
gainSetting = 0;
timer0_counter = 0;
initSerialNumber();
usb_init();
I2C_Init();
timer_init();
pinMode(B,1,OUTPUT);
/*-----------------------------------------------------------------------*/
/* Search for viable MCP3421 address options */
/*-----------------------------------------------------------------------*/
for(i=0x68;i<0x70;i++)
{
I2C_Start();
rv = I2C_Write(write_address(i));
I2C_Stop();
if(rv == 0)
{
mcp3421_addr = i;
}
}
/*-----------------------------------------------------------------------*/
/* Search for viable MCP9800 address options */
/*-----------------------------------------------------------------------*/
I2C_Start();
rv = I2C_Write(write_address(0x48));
I2C_Stop();
if(rv == 0)
{
mcp9800_addr = 0x48;
}
else
{
mcp9800_addr = 0x4D;
}
/*-----------------------------------------------------------------------*/
/* Set MCP9800 to 12 bit resolution */
/*-----------------------------------------------------------------------*/
I2C_Start();
I2C_Write(write_address(mcp9800_addr));
I2C_Write(0x01);
I2C_Write((1<<7)|(1<<6)|(1<<5));
I2C_Stop();
/*-----------------------------------------------------------------------*/
/* Set MCP9800 Register Pointer to Ambient Temperature */
/*-----------------------------------------------------------------------*/
I2C_Start();
I2C_Write(write_address(mcp9800_addr));
I2C_Write(0x00);
I2C_Stop();
while(1)
{
/*-------------------------------------------------------------------*/
/* MCP9800: Cold junction channel */
/*-------------------------------------------------------------------*/
usbPoll();
I2C_Start();
debug[0] = I2C_Write(read_address(mcp9800_addr));
tmpReadout[0] = I2C_Read(ACK);
tmpReadout[1] = I2C_Read(NO_ACK);
I2C_Stop();
movAvg_read = ((int16_t)tmpReadout[0] << 8) + ((int16_t)tmpReadout[1]);
movAvg_sum -= movAvg_mem[movAvg_ind];
movAvg_sum += movAvg_read;
movAvg_mem[movAvg_ind] = movAvg_read;
if(movAvg_ind == 7)
{
movAvg_ind = 0;
movAvg_stabil = 1;
}
else
{
movAvg_ind++;
}
if(movAvg_stabil == 1)
{
movAvg_read = movAvg_sum >> 3;
}
usbPoll();
cli();
coldJunctionReadout[0] = movAvg_read >> 8;
coldJunctionReadout[1] = movAvg_read & 0xFF;
sei();
/*-------------------------------------------------------------------*/
/* MCP3421: 3.75 SPS + 18 Bits + Initiate new conversion
/*-------------------------------------------------------------------*/
usbPoll();
I2C_Start();
I2C_Write(write_address(mcp3421_addr));
I2C_Write((1<<7)|(1<<3)|(1<<2)|gainSetting);
I2C_Stop();
/*-------------------------------------------------------------------*/
/* Small delay ...
/*-------------------------------------------------------------------*/
timer0_counter = 250;
while(timer0_counter)
{
usbPoll();
}
/*-------------------------------------------------------------------*/
/* MCP3421
/*-------------------------------------------------------------------*/
usbPoll();
I2C_Start();
I2C_Write(read_address(mcp3421_addr));
tmpReadout[0] = I2C_Read(ACK);
tmpReadout[1] = I2C_Read(ACK);
tmpReadout[2] = I2C_Read(ACK);
tmpReadout[3] = I2C_Read(NO_ACK);
I2C_Stop();
usbPoll();
cli();
thermocoupleReadout[0] = tmpReadout[0];
thermocoupleReadout[1] = tmpReadout[1];
thermocoupleReadout[2] = tmpReadout[2];
thermocoupleReadout[3] = tmpReadout[3];
sei();
}
return 0;
}
/*---------------------------------------------------------------------------*/
void timer_init()
{
/* Set prescale to 64 */
TCCR0B = (1<<CS01)|(1<<CS00);
/* enable overflow interrupt */
TIMSK = (1<<TOV0);
}
/*---------------------------------------------------------------------------*/
ISR(TIMER0_OVF_vect,ISR_NOBLOCK)
{
/* Resolution is almost 1ms */
if(timer0_counter > 0)
{
timer0_counter--;
}
}
/*---------------------------------------------------------------------------*/
void initSerialNumber()
{
uint8_t eepromProblem = 0;
uint8_t val[10];
uint8_t qw = 0;
for(qw=0;qw<10;qw++)
{
val[qw] = eeprom_read_byte(EE_addr+qw);
if((val[qw] < 48) || (val[qw] > 57))
{
eepromProblem = 1;
}
}
/* default serial number ... */
if(eepromProblem != 0)
{
for(qw=0;qw<10;qw++)
{
eeprom_write_byte((EE_addr+qw),'9');
}
}
for(qw=0;qw<10;qw++)
{
usbDescriptorStringSerialNumber[qw+1] = eeprom_read_byte(EE_addr+qw);
}
}
/*---------------------------------------------------------------------------*/