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//*****************************************************************************
// MSP430x42x0 Demo - SD16_A, LCD
//*****************************************************************************
//MLX90614 Pin Config
//GND-----6.0.....I/O supply the MLX90614
//SDA-----6.1
//SCL-----6.2
//POW-----6.3.....I/O supply the MLX90614
#include <msp430x42x0.h>
void LCD_CHECK(void);
void Init_LCD(void);
unsigned int A1,A2,A3,A4,A5;
#define a 0x01
#define b 0x02
#define c 0x04
#define d 0x80
#define e 0x40
#define f 0x10
#define g 0x20
#define h 0x08
const char char_gen[] = { // definitions for digits
a+b+c+d+e+f, // Displays "0"
b+c, // Displays "1"
a+b+d+e+g, // Displays "2"
a+b+c+d+g, // Displays "3"
b+c+f+g, // Displays "4"
a+c+d+f+g, // Displays "5"
a+c+d+e+f+g, // Displays "6"
a+b+c, // Displays "7"
a+b+c+d+e+f+g, // Displays "8"
a+b+c+d+f+g, // Displays "9"
};
//*************************************************************
//*************************************************************
void Delay(unsigned int n);
void start_bit();
void stop_bit();
void send_bit(unsigned char bit_out);
unsigned char receive_bit();
unsigned char slave_ack();
void TX_byte(unsigned char TX_buffer);
unsigned char RX_byte(unsigned char ack_nack);
unsigned char PEC_cal(unsigned char pec[],int n);
unsigned long int MEM_READ( unsigned char slave_addR, unsigned char cmdR );
void CALTEMP(unsigned long int TEMP);
void mlx90614_POW_0() { P6OUT &= ~0x08;} // define P6.3 ---> POW
void mlx90614_POW_1() { P6OUT |= 0x08;}
void mlx90614_GND_0() { P6OUT &= ~0x01;} // define P6.0 ---> GND
void mlx90614_GND_1() { P6OUT |= 0x01;}
void mlx90614_SCL_0() { P6OUT &= ~0x04;} // define P6.2 ---> SCL
void mlx90614_SCL_1() { P6OUT |= 0x04;}
void mlx90614_SDA_0() { P6OUT &= ~0x02;} // define P6.1 ---> SDA
void mlx90614_SDA_1() { P6OUT |= 0x02;}
#define _SDA_OUTPUT P6DIR |=0x02; //Set SDA as Output
#define _SDA_INPUT P6DIR &=~0x02; //Set SDA as Input
#define SDA ((P6IN & BIT1)>>1) //define input pin
//*************************************************************
//*************************************************************
void Delay(unsigned int n)
{
unsigned int i;
for(i=0;i<n;i++)
_NOP();
}
//----------------------------------------------------------------------------------------------------------------------------------------//
//Name: start_bit
//----------------------------------------------------------------------------------------------------------------------------------------//
void start_bit()
{
_SDA_OUTPUT; //Set SDA as output
Delay(5);
mlx90614_SDA_1();
//Delay(30);
mlx90614_SCL_1();
Delay(30);
mlx90614_SDA_0();
Delay(30);
mlx90614_SCL_0();
Delay(30);
}
//----------------------------------------------------------------------------------------------------------------------------------------//
//Name: stop_bit
//----------------------------------------------------------------------------------------------------------------------------------------//
void stop_bit()
{
_SDA_OUTPUT; //Set SDA as output
Delay(1);
//mlx90614_SCL_0();
mlx90614_SDA_0();
Delay(2);
mlx90614_SCL_1();
Delay(2);
mlx90614_SDA_1();
}
//----------------------------------------------------------------------------------------------------------------------------------------//
//Name: send_bit
//----------------------------------------------------------------------------------------------------------------------------------------//
void send_bit(unsigned char bit_out)
{
_SDA_OUTPUT; //Set SDA as output
Delay(5);
if(bit_out==0) {mlx90614_SDA_0();}else{mlx90614_SDA_1();}
Delay(5);
mlx90614_SCL_1();
Delay(30);
mlx90614_SCL_0();
Delay(30);
}
//----------------------------------------------------------------------------------------------------------------------------------------//
//Name: receive_bit
//----------------------------------------------------------------------------------------------------------------------------------------//
unsigned char receive_bit()
{
unsigned char bit_in;
_SDA_INPUT; //Set SDA as input
Delay(5);
mlx90614_SCL_1();
Delay(5);
if(SDA==1){bit_in=1;}else{bit_in=0;}
Delay(10);
mlx90614_SCL_0();
Delay(30);
return bit_in;
}
//----------------------------------------------------------------------------------------------------------------------------------------//
//Name: slave_ack
//1 - ACK
//0 -NACK
//----------------------------------------------------------------------------------------------------------------------------------------//
unsigned char slave_ack()
{
unsigned char ack;
ack=0;
_SDA_INPUT; //Set SDA as input
Delay(5);
mlx90614_SCL_1();
Delay(10);
if(SDA==1){ack=0;}else{ack=1;}
Delay(10);
mlx90614_SCL_0();
Delay(30);
return ack;
}
//----------------------------------------------------------------------------------------------------------------------------------------//
//Name: TX_byte
//----------------------------------------------------------------------------------------------------------------------------------------//
void TX_byte(unsigned char TX_buffer)
{
unsigned char Bit_counter;
unsigned char bit_out;
for(Bit_counter=8;Bit_counter;Bit_counter--)
{
if(TX_buffer&0x80){bit_out=1;}else{bit_out=0;}
send_bit(bit_out); //Send the current bit on SMBus
TX_buffer<<=1; //Get next bit to check
}
}
//----------------------------------------------------------------------------------------------------------------------------------------//
//Name: RX_byte
//Parameters: unsigned char ack_nack (acknowledgment bit)
//0 - Master device sends ACK
//1 - Master device sends NACK
//----------------------------------------------------------------------------------------------------------------------------------------//
unsigned char RX_byte(unsigned char ack_nack)
{
unsigned char RX_buffer;
unsigned char Bit_counter;
for(Bit_counter=8;Bit_counter;Bit_counter--)
{
if(receive_bit()==1) //Read a bit from the SDA line
{
RX_buffer<<=1; //If the bit is HIGH save 1 in RX_buffer
RX_buffer|=0x01;
}
else //If the bit is LOW save 0 in RX_buffer
{
RX_buffer<<=1;
RX_buffer&=0xfe;
}
}
send_bit(ack_nack); //Sends acknowledgment bit
return RX_buffer;
}
//----------------------------------------------------------------------------------------------------------------------------------------//
//CALCULATE THE PEC PACKET
//----------------------------------------------------------------------------------------------------------------------------------------//
unsigned char PEC_cal(unsigned char pec[],int n)
{
unsigned char crc[6];
unsigned char Bitposition=47;
unsigned char shift;
unsigned char i;
unsigned char j;
unsigned char temp;
do{
crc[5]=0; //Load CRC value 0x000000000107
crc[4]=0;
crc[3]=0;
crc[2]=0;
crc[1]=0x01;
crc[0]=0x07;
Bitposition=47; //Set maximum bit position at 47
shift=0; //Find first 1 in the transmitted bytes
i=5; //Set highest index (package byte index)
j=0; //Byte bit index, from lowest
while((pec[i]&(0x80>>j))==0 && (i>0))
{
Bitposition--;
if(j<7){ j++;}
else {j=0x00;i--;}
}//the position of highest "1" bit in Bitposition is calculated
shift=Bitposition-8; //Get shift value for CRC value
while(shift)
{
for(i=5;i<0xFF;i--)
{
if((crc[i-1]&0x80) && (i>0)) //Check if the MSB of the byte lower is "1"
{ //Yes - current byte + 1
temp=1; //No - current byte + 0
} //So that "1" can shift between bytes
else { temp=0;}
crc[i]<<=1;
crc[i]+=temp;
}
shift--;
}
//Exclusive OR between pec and crc
for(i=0;i<=5;i++) { pec[i]^=crc[i]; }
}
while(Bitposition>8);
return pec[0];
}
//----------------------------------------------------------------------------------------------------------------------------------------//
//READ DATA FROM RAM/EEPROM
//----------------------------------------------------------------------------------------------------------------------------------------//
unsigned long int MEM_READ(unsigned char slave_addR, unsigned char cmdR)
{
unsigned char DataL; //
unsigned char DataH; //Data packets from MLX90614
unsigned char PEC; //
unsigned long int Data; //Register value returned from MLX90614
unsigned char Pecreg; //Calculated PEC byte storage
unsigned char arr[6]; //Buffer for the sent bytes
unsigned char ack_nack;
unsigned char SLA;
SLA=(slave_addR<<1);
begin:
start_bit(); //Send start bit
TX_byte(SLA); //Send slave address, write
if(slave_ack()==0){stop_bit();goto begin;} //Send command
TX_byte(cmdR);
if(slave_ack()==0){stop_bit();goto begin;}//Send Repeated start bit
start_bit(); //Send slave address, read
TX_byte(SLA+1);
if(slave_ack()==0){stop_bit();goto begin;}
DataL=RX_byte(0); //
//Read two bytes data
DataH=RX_byte(0); //
PEC=RX_byte(ack_nack); //Read PEC from MLX90614
if(ack_nack==1) //Master sends ack or nack
//This depends on the pec calculation,
//if the PEC is not correct, send nack and goto begin
{stop_bit();goto begin;} //Send stop bit
stop_bit();
arr[5]=(SLA);
arr[4]=cmdR;
arr[3]=(SLA+1);
arr[2]=DataL;
arr[1]=DataH;
arr[0]=0;
Pecreg=PEC_cal(arr,6); //Calculate CRC
if(PEC==Pecreg){ ack_nack=0;}
else{ ack_nack=1;}
Data=(DataH*256)+DataL;
return Data;
}
//---------------------------------------
//Name: CALTEMP
//Temperature data is T=(Data)*0.02-273.15
//---------------------------------------
void CALTEMP(unsigned long int TEMP)
{
unsigned long int T;
unsigned int A, B;
//unsigned int tempb;
T=TEMP*2;
if(T>=27315)
{
T=T-27315;
A=T/100;
B=T-A*100;
if(A>=100){A1=A/100;A=A%100;A2=A/10;A=A%10;A3=A;}
else if(A>=10){A1=0;A2=A/10;A=A%10;A3=A;}
else {A1=0;A2=0;A3=A;}
if(B>=10){A4=B/10;B=B%10;A5=B;}
else{A4=0;A5=B;}
}
else
{
T=27315-T;
A=T/100;
B=T-A*100;
A1=9;
if(A>=10){A2=A/10;A=A%10;A3=A;}
else{A2=0;A3=A;}
if(B>=10){ A4=A/10;B=B%10;A5=B;}
else{A4=0;A5=B;}
}
}
//------------------------------------------------------------------------------
// LCD Test Code
//------------------------------------------------------------------------------
void LCD_CHECK() // Clear LCD
{
int j;
for( j = 0; j < 8; j ++) { LCDMEM[j] = 0; }
}
//------------------------------------------------------------------------------
// Init_LCD.
//------------------------------------------------------------------------------
void Init_LCD()
{
P5SEL = 0x1C; // Set COM pins for LCD
LCDACTL = LCDON + LCD4MUX + LCDFREQ_128; // 4mux LCD, ACLK/128
LCDAPCTL0 = 0x0F; // Segs S0-S15 = outputs
LCDAVCTL0 = LCDCPEN; // Enable LCDA charge pump
LCDAVCTL1 = VLCD_3_44; // to 3.26V
}
//*************************************************************
//*************************************************************
void main(void)
{
volatile unsigned int i;
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
SCFI0 |= FN_3; // Set DCO operating range
SCFQCTL = 121; // (121+1) x 32768 x 2 = 7.99 Mhz
FLL_CTL0 = DCOPLUS + XCAP14PF; // DCO+ set so freq = xtal x D x N+1
for (i = 0; i < 10000; i++); // Delay for 32 kHz crystal to
P1OUT = 0; // All P1.x reset
P1IES = 0xC0; // P1.0, P1.1 hi/low edge
P1DIR = 0x3F; // P1.0/1 = input (switches)
P6DIR = 0xFF; // All P6.x outputs
P6OUT = 0; // All P6.x reset
P5SEL = 0x1C; // Set COM pins for LCD
mlx90614_GND_0(); //powr supply
mlx90614_POW_1();
Init_LCD();
LCD_CHECK();
while (1)
{
unsigned long int i;
unsigned long int DATA;
DATA=MEM_READ(0x5a,0x07);
CALTEMP(DATA);
//start_bit();
//A4=1; A5=2; A6=3; A7=4; A8=5;
LCDMEM[0] |= a + f + e +d + h;
LCDMEM[1] = char_gen[A5 & 0x0f];
LCDMEM[2] = char_gen[A4 & 0x0f];
LCDMEM[3] = char_gen[A3 & 0x0f];
LCDMEM[3] |= h;
LCDMEM[4] = char_gen[A2 & 0x0f];
LCDMEM[5] = char_gen[A1 & 0x0f];
for (i = 0; i < 0x20000; i++); // Delay
for (i = 0; i < 0x20000; i++); // Delay
}
}

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