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| author | Jenna Fox <a@creativepony.com> | 2012-09-26 01:09:14 +1000 |
|---|---|---|
| committer | Jenna Fox <a@creativepony.com> | 2012-09-26 01:09:14 +1000 |
| commit | 9c15f6e5caee526aa429112318df096ec7b46355 (patch) | |
| tree | af34087b945f96a244137e875d52462bd6b4a817 /firmware/Makefile | |
| parent | 7b20da73c9a0ed03d32c2f9e654367900cb1e06f (diff) | |
| download | micronucleus-9c15f6e5caee526aa429112318df096ec7b46355.tar.gz micronucleus-9c15f6e5caee526aa429112318df096ec7b46355.tar.bz2 micronucleus-9c15f6e5caee526aa429112318df096ec7b46355.zip | |
instructions in makefile on how to calculate BOOTLOADER_ADDRESS
Diffstat (limited to 'firmware/Makefile')
| -rw-r--r-- | firmware/Makefile | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/firmware/Makefile b/firmware/Makefile index 0e38760..403786a 100644 --- a/firmware/Makefile +++ b/firmware/Makefile @@ -17,13 +17,16 @@ F_CPU = 16500000 DEVICE = attiny85 -# BOOTLOADER_ADDRESS is 1800 for 8k devices, 3800 for 16k and 7800 for 32k. -# Can be on the start of any flash page for ATtiny85, but must be set low enough so there is space for the full boot loader -# BOOTLOADER_ADDRESS is in units of 4 bytes seems like -BOOTLOADER_ADDRESS = 1740 FUSEOPT = $(FUSEOPT_t85) LOCKOPT = -U lock:w:0x2f:m +# hexadecimal address for bootloader section to begin. To calculate the best value: +# - make clean; make main.hex; ### output will list data: 2124 (or something like that) +# - for the size of your device (8kb = 1024 * 8 = 8192) subtract above value 2124... = 6068 +# - How many pages in is that? 6068 / 64 (tiny85 page size in bytes) = 94.8125 +# - round that down to 94 - our new bootloader address is 94 * 64 = 6016, in hex = 1780 +BOOTLOADER_ADDRESS = 1780 + PROGRAMMER = -c USBasp # PROGRAMMER contains AVRDUDE options to address your programmer |