void set_current_limit(float value)
{
#ifdef HARDWARE_TRIP
unsigned short d;
if (value == 9999) {
/* disable current trip */
d = 65535;
trip_disable = 1;
write_adc(REG_IOCONTROL, (1 << 4)); // P1DIR=1,P1DAT=0
} else {
/* remove reset */
trip_disable = 0;
write_adc(REG_IOCONTROL, (1 << 4) | (1 << 0)); // P1DIR=1,P1DAT=1
/* "inverse" calibration */
value /= user_data[0].cur_gain;
value += user_data[0].cur_offset;
/* omit cur_vgain calibration, because statistical mean of
unbalanced dividers is zero */
if (value < 0)
value = 0;
/* convert current to voltage */
value = value / DIVIDER * CUR_MULT * RCURR / 1E6;
/* convert to DAC units */
d = (unsigned short) ((value / 2.5 * 65535) + 0.5);
}
/* write current dac */
write_dac(5, d);
#else // HARDWARE_TRIP
if (value == 9999)
trip_disable = 1;
else
trip_disable = 0;
#endif // !HARDWARE_TRIP
}
byte set_voltage(float v, float* vset)
{
// Sets the PVS voltage. Reads it back and applies correction in a loop.
u16 k, iv, isv, goal;
if ((v < 0) || (v > 5.0))
return INVARG;
goal = (int)(v / dacm + 0.5);
iv = goal;
for(k=0; k < 15; ++k)
{
if(write_dac(iv)) return COMERR;
if(read_adc(12, &isv)) return COMERR; // Read channel 12.
if (abs(isv-goal) <= 1) break;
if (isv > goal) iv -= 1;
else if(isv < goal) iv += 1;
}
*vset = m12[12] * isv + c[12]; //The voltage actually set
return 0;
}
//------------------------------------------------------------------------------
// MAIN FUNCTION
//------------------------------------------------------------------------------
void main (void)
{
unsigned char index, voltage_out;
initialize_system();
printf("\n\rKeil Software, Inc.\n\r"); // Display starup message
printf("MCB517 MCU I²C Example Test Program\n\r");
printf("Version 1.0.0\n\r");
printf("Copyright 2000 - Keil Software, Inc.\n\r");
printf("All rights reserved.\n\n\r");
printf("P8591 Test Program....Reading from ADC channel 0, Writing to DAC!\n\r");
while (TRUE)
{
for (voltage_out = 0; voltage_out < 0xFF; voltage_out++)
{
write_dac(voltage_out); // Write voltage value to DAC
// Blink LEDs in sequence
for (index = 0x01; index < 0x80; index <<=1)
{
P4 = index;
delay_time(DELAY_BLINK);
}
for (index = 0x80; index > 0x01; index >>=1)
{
P4 = index;
delay_time(DELAY_BLINK);
}
// Read voltage (ADC 0) and display results
printf("DAC output: %3bu ADC Channel 0: %3bu\n\r", voltage_out, read_adc_channel(0x00));
}
}
}
void main()
{
// Stop watchdog timer to prevent time out reset
WDTCTL = WDTPW + WDTHOLD;
IO_init();
write_dac(0xff);
for(;;)
{
write_dac(0xff);
delay_ms(1);
write_dac(0xc0);
delay_ms(1);
write_dac(0x7f);
delay_ms(1);
write_dac(0x3f);
delay_ms(1);
write_dac(0x00);
delay_ms(1);
}
}
//
// Do digital to analogue to digital conversion
//
void main(void)
{ int d, dac_val, v, s, i;
printf ("These are the connections for the digital to analogue to digital test:\n");
printf ("jumper connecting GP11 to SCLK\n");
printf ("jumper connecting GP10 to MOSI\n");
printf ("jumper connecting GP9 to MISO\n");
printf ("jumper connecting GP8 to CSnA\n");
printf ("jumper connecting GP7 to CSnB\n");
printf ("jumper connecting DA1 on J29 to AD0 on J28\n");
printf ("When ready hit enter.\n");
(void) getchar();
// Map the I/O sections
setup_io();
// activate SPI bus pins
setup_gpio();
// Setup SPI bus
setup_spi();
// The value returned by the A to D can jump around quite a bit, so
// simply printing out the value isn't very useful. The bar graph
// is better because this hides the noise in the signal.
printf ("dig ana\n");
for (d=0; d <= 256; d+= 32)
{
if (d == 256)
dac_val = 255 * 16;
else
dac_val = d * 16;
write_dac(1, dac_val);
v= read_adc(0);
// v should be in range 0-1023
// map to 0-63
s = v >> 4;
printf("%3x %04d ", dac_val, v);
// show horizontal bar
for (i = 0; i < s; i++)
putchar('#');
for (i = 0; i < 64 - s; i++)
putchar(' ');
putchar('\n');
short_wait();
} // repeated write/read
for (d=224; d >= 0; d-= 32)
{
dac_val = d * 16;
write_dac(1, dac_val);
v= read_adc(0);
// v should be in range 0-1023
// map to 0-63
s = v >> 4;
printf("%3x %04d ", dac_val, v);
// show horizontal bar
for (i = 0; i < s; i++)
putchar('#');
for (i = 0; i < 64 - s; i++)
putchar(' ');
putchar('\n');
short_wait();
} // repeated write/read
printf("\n");
restore_io();
} // main
