Edit - here are some resources in response to comments:
costate: http://bamafolks.com/randy/students/embedded/dynamicC_mtask.html
writeUserBlockArray: http://ftp1.digi.com/support/documentation/html/DynCFunctionReference/12fun595.htm#1259708
The error I am getting is `-1: Invalid address or range'.
#define MAX_SAMPLES 20
#define REPORT_AFTER 3
main()
{
int i;
int report;
int write_result;
int read_result;
struct temp_struct {
float celcius;
float fahrenheit;
} temperature_data;
struct temp_struct save_data[MAX_SAMPLES];
struct temp_struct read_data[MAX_SAMPLES];
unsigned int save_lens[MAX_SAMPLES];
float *pTempC, *pTempF;
pTempC = &temperature_data.celcius;
pTempF = &temperature_data.fahrenheit;
i = 0;
report = 0;
brdInit();
while(1)
{
costate
{
sampleTemp(&temperature_data.celcius, &temperature_data.fahrenheit);
save_data[i].celcius = *pTempC;
save_data[i].fahrenheit = *pTempF;
save_lens[i] = sizeof(temperature_data);
if(i==MAX_SAMPLES) i=0; else i++;
report=1; // Sample has been taken, a report can be produced
waitfor(DelaySec(SAMPLE_DELAY_SECS));
}
// If REPORT_AFTER set to 3, this executed every third sample taken.
// "report" the last set of data saved by printing out
if(report && i%REPORT_AFTER==0 && i!=0)
{
write_result = writeUserBlockArray(i-REPORT_AFTER, save_data, save_lens, REPORT_AFTER);
// Read data to check it was saved correctly
read_result = readUserBlockArray(read_data, save_lens, REPORT_AFTER, i-REPORT_AFTER);
// Print out all data saved here.
report = 0; // Do not report again until another sample has been taken.
break; // Stops after first report. Can be removed later
} // end if
} // end while
} // end main
float sampleTemp(float *tempC, float *tempF)
{
auto float Tk, //calculated temperature kelvins
Draw; //raw data value
auto int i;
printf("Getting temperature\n\n");
Draw = anaIn(7, SINGLE, GAIN_1);
//calculate temperature in kelvins
Tk = (Bt*Tkstd) / ( Tkstd * ( log( fabs( (-Draw*Rs) / (Rtstd*(Draw-(Dmax*Gain))) ) ) ) + Bt );
*tempC = Tk - 273.15; //convert to celcius
*tempF = 1.8*(Tk - 255.37); //calculate fahrenheit
return 0;
}
This is all relevant code. I am consistently getting -1 returned from the writeUserBlockArray() method which symbolises an invalid address or range.
I don't think the fact that it is Dynamic-C makes much difference but the offending method's outline is this:
writeUserBlockArray(addrOffset, arraySources, arraySourceSizes, numSources);
I am new to C and I think I am doing something wrong with the way I am saving the data to the array?
Thanks in advance.
The problem was that I was trying to write an array of data to the memory. The actual way of using the writeUserBlockArray(...) method is to specify an array of pointers.
New, working, code:
#define SAMPLE_DELAY_SECS 5
#define MAX_SAMPLES 20
#define REPORT_AFTER 3
main()
{
int temp;
int i; // Iteration #
int report; // Whether to produce a report or not
int write_result; // The numerical result of the write-to-memory operation
int read_result; // The numerical result of the read-from-memory operation
// Define a structure which can be used to hold both temperature measurements
struct temp_struct {
float celcius;
float fahrenheit;
} temperature_data;
void *save_pointers[MAX_SAMPLES]; // An array of pointers pointing to the data to be saved in memory
struct temp_struct save_data[MAX_SAMPLES]; // Array of actual data which can be loaded with the read operation
unsigned int save_lens[MAX_SAMPLES]; // An array of the size (in bytes) of each element in the save_data array
i = 0;
report = 0;
brdInit(); // Needs to be called before any operations are performed with the hardware.
while(1)
{
/*
* Costate is a way of multitasking in Dynamic-C. By using a costate block in
* conjunction with the waitfor keyword, the block can be paused until it
* has finished waiting.
*
* Further info:
* http://bamafolks.com/randy/students/embedded/dynamicC_mtask.html
*/
costate
{
// Method taken from: http://read.pudn.com/downloads107/sourcecode/embed/441399/Samples/RCM3700/Tcpip/RabbitWeb/TEMPERATURE.C__.htm
sampleTemp(&temperature_data.celcius, &temperature_data.fahrenheit);
save_pointers[i] = &temperature_data;
save_lens[i] = sizeof(temperature_data);
printf("save_data[%d].celcius is %f\n", i, save_data[i].celcius);
printf("save_data[%d].fahrenheit is %f\n\n", i, save_data[i].fahrenheit);
if(i==MAX_SAMPLES) i = 0; else i++;
report=1; // Sample has been taken, a report can be produced
waitfor(DelaySec(SAMPLE_DELAY_SECS));
}
/*
* This IF block is used to produce a report every so often, either by
* emailing out some data, updating the web interface or simply printing
* it to the screen.
*
* A report will be produced when:
* a) a new sample has been taken (report)
* b) the desired number of samples has been reached (i%REPORT_AFTER==0)
* c) it is not the very first sample to be taken (i!=0)
*/
if(report && i%REPORT_AFTER==0 && i!=0) // For every third sample
{
/*
* writeUserBlockArray(address_offset (unsigned int),
* sources (array),
* source_sizes (array),
* num_sources (int));
* Documentation:
* http://ftp1.digi.com/support/documentation/html/DynCFunctionReference/12fun595.htm#1259708
*/
write_result = writeUserBlockArray(i-REPORT_AFTER, save_pointers, save_lens, REPORT_AFTER);
/*
* readUserBlockArray(destinations (array),
* destination_sizes (array),
* num_sources (int),
* address_offset (unsigned int));
* Documentation:
* http://ftp1.digi.com/support/documentation/html/DynCFunctionReference/12fun441.htm#1259907
*/
read_result = readUserBlockArray(save_data, save_lens, REPORT_AFTER, i-REPORT_AFTER);
printf("Write Result: %d\nRead Result: %d\n\n", write_result, read_result);
printf("Most recent data...\n");
for(temp = 0; temp < REPORT_AFTER; temp++)
{
printf("save_data[%d].C: %f\n", temp, save_data[temp].celcius);
printf("save_data[%d].F: %f\n", temp, save_data[temp].fahrenheit);
}
report = 0; // Do not report again until another sample has been taken.
}// End if
}// End while
}// End main