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Add support for holding a button on boot to wait for programmer. #352

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Add support for holding a button on boot to wait for programmer. #352

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00fe371
Add support for holding a button on boot to wait for programmer.
xC0000005 Sep 26, 2022
28ef0a6
save work.
xC0000005 Aug 7, 2025
2b34e62
Add NODATE=1 option to Makefile, for deterministic compilation.
dlitz Feb 27, 2024
40d4c78
fixed formatting and typos
aschnell Mar 23, 2024
a139854
https://github.com/Optiboot/optiboot/issues/357
WestfW May 25, 2025
49e1255
don't run baudcheck if bash isn't present
WestfW May 26, 2025
dbf23a2
fix copy and paste
xC0000005 Aug 7, 2025
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5 changes: 5 additions & 0 deletions optiboot/bootloaders/optiboot/optiboot.c
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Original file line number Diff line number Diff line change
Expand Up @@ -895,6 +895,11 @@ int main(void) {
#endif
#endif

#ifdef HOLD_TO_PROG
if (HOLD_TO_PROG_ON)
watchdogConfig(WATCHDOG_OFF);
else
#endif
// Set up watchdog to trigger after desired timeout
watchdogConfig(WDTPERIOD);

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23 changes: 23 additions & 0 deletions optiboot/bootloaders/optiboot/pin_defs.h
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Expand Up @@ -1628,3 +1628,26 @@
#if SOFT_UART && defined(SOFTTX) && defined(SOFTRX)
#include "pins_softuart.h"
#endif

#ifdef HOLD_TO_PROG

#if HOLD_TO_PROG == D0
#undef HOLD_TO_PROG
#define HOLD_TO_PROG_PIN PIND
#define HOLD_TO_PROG PIND0

#else
#error -------------------------------------------
#error Unrecognized LED name. Should be like "B5"

@hecko hecko Dec 22, 2022

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I think this is incorrect wording probably an effect of cut&paste. Can you re-word please?

@xC0000005 xC0000005 Dec 29, 2022

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Yeah, I'll change it (and yeah, it's cut and paste).

#error -------------------------------------------
#endif

#endif

#ifdef BUTTON_ON_HIGH
// A pin is 1 when the button is down
#define HOLD_TO_PROG_ON ((HOLD_TO_PROG_PIN & HOLD_TO_PROG) == 1)
#else
// A pin is 0 when the button is down
#define HOLD_TO_PROG_ON ((HOLD_TO_PROG_PIN & HOLD_TO_PROG) == 0)
#endif