Sparky, I checked and double checked all the wiring and the clock settings, etc. and couldn't find any mistakes. So I tried a 20 MHz oscillator without any change in what I was seeing. The delay_ms command seemed to be working correctly. I could program it to give me a 10 uS pulse on the heartbeat p...

Sparky, Thanks for jumping in. OK, I put the code back in to set up the SDA and SCL lines. I also set the analog inputs to digital. // I2C Pins sbit SCL at LATB1_bit; sbit SCL_dir at TRISB1_bit; sbit SDA at LATB0_bit; sbit SDA_dir at TRISB0_bit; void main() { PCFG0_bit = 1; // turn off analog inputs...

Yes, I have 4K7 pull up resistors on each line.

Terry

I'm trying without luck to get an 18F4550 to connect to another device via the hardware I2C port. The program freezes whenever I add the line I2C1_Start; to the program. I have looked at the SDA and SCL lines with a logic analyzer and I'm not seeing what I expected. I see the SDA line go low followe...

The number of bytes that you specify here... const char HID_INPUT_REPORT_BYTES = 64; const char HID_OUTPUT_REPORT_BYTES = 64; Must match the number of bytes that you really are sending as defined in your descriptor table. const struct { char report[USB_HID_RPT_SIZE]; }hid_rpt_desc = { { 0x05, 0x01, ...

If you paste your code inside the code tags it makes it keeps the indentation and makes it much easier to read. Click on the Code box(next to the Quote box) at the top of the reply screen and then paste your code in between the Code and /Code tags. while (1) { // endless loop if (RA0_bit) { // butto...

OK, I have figured out part of what is happening. flag_xmt = 0; flag_xmt_p = 0; if(flag_xmt==1||flag_xmt_p==1) { // Start transmit sequence heartbeat_cntr = 0; // clear counter beacon_cntr6 = 0; // clear counter LED1 = 1; // turn on transmit LED xmt = 1; } I missed the fact that flag_xmt_p could be ...

Android, Thanks for the tips. I appreciate the pointers. if(rmc_valid==1 & gga_valid==1) { // if both GPS sentences report good data turn on LED2 This was a mistake that I didn't catch before. I always confuse & and &&. I am updating my code to reflect your pointers. ...all do the same thing, but th...

Android and Spary1039 Thanks for the ideas, they were very much appreciated. Unfortunately neither one cleared up the strange issue that I am seeing. Timer 3 is interrupting around 70,000 times per second in order to produce a 32 step sine wave of 2200Hz. Some times the program will run for minutes ...

I am having the strangest problem with a program I am working on and wondering if anyone else has seen something like this. I am using MikroC version 6.5.0 with a PIC18F4550. The reference oscillator frequency is 12MHz and that is multiplied up to 48 MHz. The program runs on a custom PCB. The issue ...

Don't forget that the EEPROM on the PIC has a limited number of erase/write cycles. If you write to the memory once a second the EEPROM will be worn out in a little over 1 day.

100,000 Erase/write cycle data EEPROM memory, typical

The _T6936c.h file I was using was an older copy and didn't have the line referring to INVERT. I sustituted the file with the newest version of _T6936c.h and the problem is solved. /* * color masks */ #define T6963C_WHITE 0b1000 #define T6963C_BLACK 0 #define T6963C_INVERT 2 Terry

Marina, Thank you for the reply. In the Help File INVERT is listed as an option for T6963C_circle_fill. I did notice that INVERT was not included in the color masks in the .h file. Terry Prototype void T6963C_circle_fill(int x, int y, long r, unsigned char pcolor); Returns Nothing. Description Draws...

I am using the SmartGLCD panel and want to draw a filled circle but have it invert the existing color. The command T6963C_circle_fill(120, 64, 110, T6963C_INVERT); returns an error when I try to use it. Both T6963C_WHITE and T6963C_BLACK work correctly. "191 324 Undeclared identifier 'T6963C_INVERT'...

Try this.
http://www.ganssle.com/debouncing-pt2.htm