Hello Mr Raj, Thank for your PIC post series, it is great your work for every beginner like me. I had followed stricky this your Uart guide, but unlucky. First times, when run hardware with USB-rs232 P9 convertor (without GND common to COM port of convertor)I can turn on/off LED (not receive any thing in ternminal), but after some my small change in code to send only one character or shorter string also on test board for better program over icsp which i did'nt recognized excactly which change is cause, i even now can not turn Led on/off also receive any thing.
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You must setup the serial port, by setting the correct registers. This is described in the data sheet. In section 12. In Hi-Tech C it is none built in library functions for serial communication. Introduction to the Microchip PIC C Programming. The final step is to put your code in a real PIC16F690. Now i need to see the data when i trasnmit. Aug 07, 2008 Serial communication with PIC chip. Arduino Forum > Forum 2005 -2010 (read only) > Hardware. I'm using the PIC16F690 that comes with the PICkit2 programmer/Low Pin Count demo board from Microchip. Here's my code written with the CCS C compiler for the midrange PIC devices: Code: // PIC code #include #fuses INTRC_IO, NOWDT.
When i common ground PIC and COM convertor, i can receive sometimes some weird characters. I had came back to simulate in Proteus with virtual terminal and oscilloscope to measure on A and C channel for rx/tx and i could see pules in channels but also didnt received any character also turn on/off LED. My hardware board is supplied by 12v adapter over LM7805cv to 5v, pin 1 connected to pin 1 icsp with isolate circuit as PICkit2 datasheet. Could you guide me how to investigate those error, Thank You alot for your any commend and guide! Thank for your soon reply, Mr Raj, (without GND common to COM port of convertor:That means when First time i tried in test board, i did'nt connect COM pin 5 to ground of test board but i could turn led on/off, but could not receive any thing on virtual terminal software. That is sames status for about 10 times.
But after some small change with code also hardware, or even recover back your original code, i even can not turn led on/off any more. When i connect COM pin 5 to ground of test board, sometimes i can see weird string in terminal (i understand that's for string in UART_init code), but still cannot turn led on/off. That means i can not transmit or receive any things. Sorry i stiil find how to post my picture or attach file in this reply which captures pulses in rx/tx channels on Proteus oscilloscope emulation evironment. Thank Raj, 1-I had never think to change MCU frequence, i thought frequence from crystal, after change mcu freq from 1 to 20 Mhz, i can see weird string as pic but still can not turn on/off LED 2- You mention to hex file that means MCU firmware, i click to MCU firmware and replace again your origin code and simulate again with same above state, have some warning as i casting example from UART_send_string('UART Module Initialized and active') to UART_send_string((char *)'UART Module Initialized and active'); to avoid warning but that 's for skip code warning only, simulation is same.
Thank Mr Raj, Everything follow guide, but i'm still unlucky, i added max232 to simulation also to testboard and i had better result but still not complete it, not receive the exact expected result. I get ok result with other uart lesson (on test board, not well with simulation) which use C prinf function and BRGH = 0 also RCIE. I'm trying to understand that code fully and will come back to investigate my issue in your lesson. Another way,I think i did'nt understand my proteus Hyper Terminal fully or it (Proteus 8.1) does not run exactly in Win7 64. Thank Mr Raj and see you at your wifi lesson! I have got following msg while compiling, cud u please the cause of error happened???? 877A.c:94: warning: (359) illegal conversion between pointer types pointer to const unsigned char -> pointer to unsigned char 877A.c:100: warning: (373) implicit signed to unsigned conversion 877A.c:103: warning: (359) illegal conversion between pointer types pointer to const unsigned char -> pointer to unsigned char 877A.c:107: warning: (373) implicit signed to unsigned conversion 877A.c:110: warning: (359) illegal conversion between pointer types pl help us.
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