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avrdude
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Create a bespoke bootloader programmer for gammaBoot trinkets

This commit is contained in:
Stefan Rueger 2022-08-31 18:15:35 +01:00
parent dab99c0823
commit a536a01ebf
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GPG Key ID: B0B4F1FD86B1EC55
2 changed files with 24 additions and 1 deletions
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17
src/avrdude.conf.in
View File

@ -1458,6 +1458,23 @@ programmer
usbpid = 0x0c9f;
;
#------------------------------------------------------------
# gemmaBoot
#------------------------------------------------------------
# Serving the Gemma bootloader
# https://github.com/adafruit/Adafruit-Trinket-Gemma-Bootloader
programmer
id = "gemmaBoot";
desc = "Gemma bootloader disguised as USBtiny";
type = "usbtiny";
prog_modes = PM_SPM;
connection_type = usb;
usbvid = 0x2341;
usbpid = 0x0105;
;
#------------------------------------------------------------
# arduinoisp
#------------------------------------------------------------

6
src/usbtiny.c
View File

@ -618,6 +618,12 @@ static int usbtiny_chip_erase(const PROGRAMMER *pgm, const AVRPART *p) {
if (! usbtiny_avr_op( pgm, p, AVR_OP_CHIP_ERASE, res )) {
return -1;
}
if(pgm->prog_modes & PM_SPM) { // Talking to bootloader directly
AVRMEM *fl = avr_locate_mem(p, "flash");
// Estimated time it takes to erase all pages in bootloader
usleep(p->chip_erase_delay * (fl? fl->num_pages: 999));
} else
usleep(p->chip_erase_delay);
// prepare for further instruction