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Create a bespoke bootloader programmer for gammaBoot trinkets

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This commit is contained in:
Stefan Rueger
2022-08-31 18:15:35 +01:00
parent dab99c0823
commit a536a01ebf
2 changed files with 24 additions and 1 deletions

17
src/avrdude.conf.in

@@ -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
#------------------------------------------------------------

8
src/usbtiny.c

@@ -618,7 +618,13 @@ static int usbtiny_chip_erase(const PROGRAMMER *pgm, const AVRPART *p) {
if (! usbtiny_avr_op( pgm, p, AVR_OP_CHIP_ERASE, res )) {
return -1;
}
usleep( p->chip_erase_delay );
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
pgm->initialize(pgm, p);