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fix(display): return TWIM0 to its reset state before the application starts #103

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Merged
jamesarich merged 1 commit into from
Nov 10, 2026
Merged

fix(display): return TWIM0 to its reset state before the application starts #103

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14 changes: 14 additions & 0 deletions src/boards/boards.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1171,6 +1171,20 @@ void board_display_teardown(void) {
_display_present = false;
}
nrf_twim_disable(_twim);

// The application starts with no reset in between and the Arduino core never
// writes SHORTS: a LASTTX_STOP left here stops its repeated-start transfers,
// and it then waits for SUSPENDED with no timeout.
nrf_twim_shorts_set(_twim, 0);
nrf_twim_event_clear(_twim, NRF_TWIM_EVENT_STOPPED);
nrf_twim_event_clear(_twim, NRF_TWIM_EVENT_ERROR);
nrf_twim_event_clear(_twim, NRF_TWIM_EVENT_SUSPENDED);
nrf_twim_event_clear(_twim, NRF_TWIM_EVENT_RXSTARTED);
nrf_twim_event_clear(_twim, NRF_TWIM_EVENT_TXSTARTED);
nrf_twim_event_clear(_twim, NRF_TWIM_EVENT_LASTRX);
nrf_twim_event_clear(_twim, NRF_TWIM_EVENT_LASTTX);
(void) nrf_twim_errorsrc_get_and_clear(_twim);
nrf_twim_pins_set(_twim, 0xFFFFFFFF, 0xFFFFFFFF);
}

static bool oled_write_page(uint8_t page, uint8_t col, uint8_t const* buf, size_t nbytes) {
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