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This interface was completely configured, controlled, and read
by a 90LS8535 Atmel AVR (TM).
This is a first attempt with an Atmel AVR (had it for a week
so far), and programming with CodeVisionAVR (TM).
In this example:
- ADC0 is plotted as an analog channel and in gauge 1
- A variable (count) is plotted as a second analog channel
and in gauge 2
- Port C controlled with the switches
- Port B input is displayed on the lights and 4 lower bits
plotted in digital.
Example code to control plot:
plot_config();
// send configuration information for gauges, lights, etc
gauge_range(1,0,1200);
// set gauge 1 to 0-1200
gauge_setpoints(1,100,1100);
// set gauge 1 setpoints 100 low, 1000 high
gauge_range(2,-300,300);
// set gauge 2 range -300 to 300
gauge_setpoints(2,-200,200);
// set gauge 2 setpoints -200 low, 200 high
gauge_alarm(1,1);
// enable alarm on gauge 1
set_labels();
// call routine to set labels of gauges, etc
switch_set(2,1);
// turn switch 2 on
putsf("!SPAN 0,1000\r");
// set Y axis span
putsf("!PLOT 1\r");
// enable plotting
putsf("!RSET\r");
// reset the plot
while(1)
{
count++;
// increment general counter
delay_ms(500);
// 500mS delay (appox.)
printf("!STAT Switch Byte = %d\r",switchByte);
// place data of sitchByte read in status box
plot_channel(1,adc_data[0]);
// plot analog channel 1 with ADC0
plot_channel(2,count);
// plot analog channel 2 with count;
gauge_set(1,adc_data[0]);
// set gauge 1 value to ADC0
gauge_set(2,count);
// set gauge 2 value to count
gauge_label(2,count);
// set gauge 2 label to count value
plot_digital(4,PINB);
// plot 4 lower bits of PINB in digital
lights_set(PINB);
// set Lights to PINB byte
switches_read();
// go update switch variables
PORTC=switchByte;
// Set port C to read switch byte
};
Currently, StampPlot is sending a byte serially of the switch
values (at least 1 must be on). This is read by the AVR to control PORT
C. I have tried to use analog sliders (multiple) for reading analog values
from StampPlot, and have had success, but for limited run time. All
instructions to StampPlot must end in a ASCII 13 (\r). When using scanf
for returning data, it wants a ASCII 10 for end of string... gets a little
messy....
Example: To read 3 sliders (not shown) called SLD1, SLD2, SLD3
putsf("!READ
(SLD1),(SLD2),(SLD3)\r");
// Tell StampPlot to send 3 values, comma separated.
putsf("!BSND
10:);
// Send byte value of 10 from StampPlot to end string.
scanf("\r%d,%d,%d\r\n",Slider1,slider2,slider3) ; //
Accept returning data and parse into variables
But scanf often causes the controller to lock up awaiting data
and other issues, and I decided to move on.
Also, this could be made into a really nice library instead of
functions in the main code.
I'm happy to post any better examples, and to provide free
licenses for such!
To use this example:
- Compile and program AVR.
- Connect the AVR's RXD and TXD, to serial port
- Run StampPlot, select no-frills plot.
- Connect on Stampplot.
- Reset AVR -- StampPlot configuration should begin.
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