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need to gpio_set_dir() at some point

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This commit is contained in:
Dan Halbert 2021-02-26 15:27:35 -05:00
parent d0f1cfb039
commit d9234ffa82
1 changed files with 11 additions and 14 deletions
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25
ports/raspberrypi/common-hal/digitalio/DigitalInOut.c
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@ -99,21 +99,18 @@ digitalio_direction_t common_hal_digitalio_digitalinout_get_direction(
void common_hal_digitalio_digitalinout_set_value(
digitalio_digitalinout_obj_t* self, bool value) {
const uint8_t pin = self->pin->number;
if (value) {
// If true, set the direction -before- setting the pin value, to
// to avoid a glitch true 3.3v on the pin before switching from output to input for open drain.
if (self->open_drain) {
gpio_set_dir(pin, GPIO_IN);
}
gpio_put(pin, true);
if (self->open_drain && value) {
// If true and open-drain, set the direction -before- setting
// the pin value, to to avoid a high glitch on the pin before
// switching from output to input for open-drain.
gpio_set_dir(pin, GPIO_IN);
gpio_put(pin, value);
} else {
// If false, set the direction -after- setting the pin value,
// to avoid a glitch 3.3v on the pin before switching from input to output for open drain,
// when previous value was high.
gpio_put(pin, false);
if (self->open_drain) {
gpio_set_dir(pin, GPIO_OUT);
}
// Otherwise set the direction -after- setting the pin value,
// to avoid a glitch which might occur if the old value was
// different and the pin was previously set to input.
gpio_put(pin, value);
gpio_set_dir(pin, GPIO_OUT);
}
}