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Merge #19357

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19357: boards/adafruit-itsybitsy-m4: turn off APA102 LED on startup r=benpicco a=benpicco



Co-authored-by: Benjamin Valentin <benjamin.valentin@bht-berlin.de>
This commit is contained in:
bors[bot] 2023-03-16 22:31:54 +00:00 committed by GitHub
commit c4400e8964
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1 changed files with 36 additions and 0 deletions
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36
boards/adafruit-itsybitsy-m4/board.c
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@ -53,3 +53,39 @@ static mtd_spi_nor_t samd51_nor_dev = {
mtd_dev_t *mtd0 = (mtd_dev_t *)&samd51_nor_dev;
#endif /* MODULE_MTD */
static inline void _toggle(unsigned n)
{
n *= 2;
while (--n) {
/* This might break if the GPIO driver gets more optimized, but
* with the current implementation the toggle is slow enough :) */
gpio_toggle(APA102_PARAM_CLK_PIN);
}
}
void board_init(void)
{
/* if the real driver is used, it will deal with the LED */
if (IS_USED(MODULE_APA102)) {
return;
}
/* bootloader leaves on an annoyingly bright LED - turn it off manually */
gpio_init(APA102_PARAM_DATA_PIN, GPIO_OUT);
gpio_init(APA102_PARAM_CLK_PIN, GPIO_OUT);
/* start frame - 32 zero bits */
gpio_clear(APA102_PARAM_DATA_PIN);
_toggle(32);
/* LED frame: 3 start bits (1), 5 alpha bits (0), 24 color bits (0) */
gpio_set(APA102_PARAM_DATA_PIN);
_toggle(3);
gpio_clear(APA102_PARAM_DATA_PIN);
_toggle(29); /* 5 alpha + 8 red + 8 green + 8 blue */
/* end frame - 32 one bits */
gpio_set(APA102_PARAM_DATA_PIN);
_toggle(32);
}