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This is usually the case when using a compiler, for example the C-compiler PCM from CCS. This means, that the first 4 words in the user program must contain a GOTO (long jump) pointing to the remaining user program. The bootloader reallocates the program words between 0x000 and 0x003. The last lines will generate a compiler error if the user program goes higher than 0x0EFF. Memory reservation in Microchip MPASM is done like this for a 16F873: #org 0x0F00,0x0FFF //16F873 bootloader resides here For the 16F873, memory reservation is done like this in CCS C (PCM 3.060): Memory reservation is necessary to preserve the code space used by the bootloader. In my case, the PIC downloader and HyperTerminal both use COM2 - but never at the same time!
#Ccs bootloader tutorial serial
If the downloaded program is going to use the serial port of the PIC, the PIC downloader must be closed and a terminal program (e.g. After a few seconds - viola - the new user program is running in the PIC. The bootloader and PIC downloader shake hands and then the hex-file is downloaded. The reset activates the bootloader and makes it listen for a new download on the serial port. Load the hex-file into the PIC downloader (click Search or press F2), activate the downloader (click Write or press F4) and reset the PIC. The PIC downloader writing to the target PIC
#Ccs bootloader tutorial software
A test program is also included in the bootloader software package.įig. An UART test program for 16F873 and a description of a testboard for 16F873 can be found elsewhere on this site. After having programmed the bootloader into the PIC, the download procedure is tested by downloading a suitable program into the PIC. The PIC downloader is used for transferring the hex-file from your PC to the bootloader in the target chip. This is because the bootloader does not change the configuration word of the PIC.Ī PIC downloader is contained in the bootloader software package. The fuses selected when programming the bootloader can not be changed later by the downloaded user program. Fuse settings for programming the bootloader My recommended fuse settings are shown in figure 2.įig. If the Low Voltage programming fuse is on, the PIC may become unstable during operation. I did not want the Low Voltage programming to be on (which it is in the hex-file). Load the hex-file into the PIC-programmer and check the fuse settings before programming.
#Ccs bootloader tutorial how to
I'll explain the procedure by giving an example how to program the bootloader version 8.23 into a 16F873.Ĭhoose the hex-file with the right crystal oscillator frequency and the desired download speed. The bootloader package contains all the software needed. If no download is detected, the bootloader activates the user program, starting with the first 4 reallocated words and then jumping to the remaining user program. At boot time, the bootloader waits 200 ms for a download to begin. The original 4 words are recognized during download and reallocated to the memory space of the bootloader.
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The first 4 words in the flash memory (0x000 to 0x003) contain a jump to the bootloader.