int bread (
struct vnode * vp,
lblkno_t blkno,
int size,
struct ucred * cred,
struct buf ** bpp
) {
struct buf *bp;
bp = buf_getblk (vp, blkno, size);
*bpp = bp;
/* if not found in cache, do some I/O */
if ((bp->b_flags & B_CACHE) == 0) {
bp->b_flags |= B_READ;
bp->b_flags &= ~(B_DONE | B_ERROR | B_INVAL);
bp->b_bio->bio_flags = BIO_READ;
VOP_STRATEGY (vp, bp);
return (buf_wait (bp));
}
return (OK);
}
int bwrite (
struct buf * bp
) {
int rtval;
int oldflags = bp->b_flags;
if(bp->b_flags & B_INVAL) {
brelse (bp);
return (OK);
}
if((bp->b_flags & B_BUSY) == 0) {
#ifdef DIAGNOSTIC
logMsg ("bwrite: buffer is not busy",
0, 0, 0, 0, 0, 0);
#endif
return;
}
bp->b_flags &= ~(B_READ | B_DONE | B_ERROR);
bp->b_bio->bio_flags = BIO_WRITE;
VOP_STRATEGY (bp->b_vp, bp);
if ((oldflags & B_ASYNC) == 0) {
rtval = buf_wait (bp);
brelse (bp);
return (rtval);
}
return(OK);
}
void main(void)
{
/* Configure the oscillator for the device */
ConfigureOscillator();
/* Initialize I/O and Peripherals for application */
InitApp();
select_chip(1); // Select the ADT7320
SSPBUF = 0b00001000; // Command byte indicating a write
buf_wait();
SSPBUF = 0b00000000; // Write to the ADT7320 config register
buf_wait();
select_chip(2); // Select the AD7793 ADC
SSPBUF = 0b00001000; // Command byte indicating a write to the
buf_wait(); // mode register
SSPBUF = 0b00000000; // First 8 bits of the 16 bit mode register
buf_wait();
SSPBUF = 0b11000001; // Second 8 bits of the mode register
buf_wait();
select_chip(1);
SSPBUF = 0b01010000; // Command byte to read temperature
buf_wait();
int junc_bin = SSPBUF/1000;
float junc_temp = 25;
int loop_counter = 0;
while(1)
{
PORTCbits.RC6 = 0b1;
PORTCbits.RC7 = 0b1;
PORTBbits.RB5 = 0b1;
PORTBbits.RB4 = 0b1;
PORTBbits.RB3 = 0b1;
PORTBbits.RB2 = 0b1;
PORTBbits.RB1 = 0b1;
PORTBbits.RB0 = 0b1;
PORTA = 0b11110111;
for (int thermo_sel = 1; thermo_sel < 3; thermo_sel++)
{
select_chip(2);
SSPBUF = 0b00010000; // Command byte indicating a write to the
buf_wait(); // config register for the thermocouple
SSPBUF = 0b01000110; // First 8 bits of the 16 bit config register
buf_wait(); // for the thermocouple
switch (thermo_sel)
{
case 1:
SSPBUF = 0b10010000; // Second 8 bits for the first thermo
buf_wait();
break;
case 2:
SSPBUF = 0b10010001; // Second 8 bits for the second thermo
buf_wait();
break;
}
int not_ready = 1;
while (not_ready == 1)
{
SSPBUF = 0b01000000; // Command byte to read status
buf_wait();
not_ready = SSPBUF/10000000;
}
SSPBUF = 0b01011000; // Command byte to read from first thermo
buf_wait();
float thermo_v = 0;
for (int i=0; i<3; i++)
{
//thermo_v += (binary_decimal(SSPBUF) * (16 - i * 8));
}
junc_temp = (binary_decimal(junc_bin))/16.0;
// if (junc_temp/1000000000000) {junc_temp = (binary_decimal(junc_bin) - 8192)/16.0;}
float tc = temp_voltage(junc_temp) + thermo_v;
seven_segment(voltage_temp(tc), thermo_sel);
}
loop_counter++;
if (loop_counter > 100)
{
loop_counter = 0;
select_chip(1);
SSPBUF = 0b01010000; // Command byte to read temperature
buf_wait();
junc_bin = SSPBUF;
}
char* str = display_number(216.98);
char strval[5];
for (int i=0; i<6; i++) {strval[i] = *(str+i);}
char digit = strval[0];
int val = 5;
switch (digit) {
case 0x30:
val = 0;
break;
case 0x31:
val = 1;
break;
case 0x32:
val = 2;
break;
}
int result = val;
/* TODO <INSERT USER APPLICATION CODE HERE> */
}
}
