diff options
Diffstat (limited to 'esp8266/machine_pin.c')
| -rw-r--r-- | esp8266/machine_pin.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/esp8266/machine_pin.c b/esp8266/machine_pin.c index 385551578..febbc1587 100644 --- a/esp8266/machine_pin.c +++ b/esp8266/machine_pin.c @@ -163,6 +163,28 @@ void mp_hal_pin_output(mp_hal_pin_obj_t pin_id) { } } +void mp_hal_pin_open_drain(mp_hal_pin_obj_t pin_id) { + const pyb_pin_obj_t *pin = &pyb_pin_obj[pin_id]; + + if (pin->phys_port == 16) { + // configure GPIO16 as input with output register holding 0 + WRITE_PERI_REG(PAD_XPD_DCDC_CONF, (READ_PERI_REG(PAD_XPD_DCDC_CONF) & 0xffffffbc) | 1); + WRITE_PERI_REG(RTC_GPIO_CONF, READ_PERI_REG(RTC_GPIO_CONF) & ~1); + WRITE_PERI_REG(RTC_GPIO_ENABLE, (READ_PERI_REG(RTC_GPIO_ENABLE) & ~1)); // input + WRITE_PERI_REG(RTC_GPIO_OUT, (READ_PERI_REG(RTC_GPIO_OUT) & ~1)); // out=0 + return; + } + + ETS_GPIO_INTR_DISABLE(); + PIN_FUNC_SELECT(pin->periph, pin->func); + GPIO_REG_WRITE(GPIO_PIN_ADDR(GPIO_ID_PIN(pin->phys_port)), + GPIO_REG_READ(GPIO_PIN_ADDR(GPIO_ID_PIN(pin->phys_port))) + | GPIO_PIN_PAD_DRIVER_SET(GPIO_PAD_DRIVER_ENABLE)); // open drain + GPIO_REG_WRITE(GPIO_ENABLE_ADDRESS, + GPIO_REG_READ(GPIO_ENABLE_ADDRESS) | (1 << pin->phys_port)); + ETS_GPIO_INTR_ENABLE(); +} + int pin_get(uint pin) { if (pin == 16) { return READ_PERI_REG(RTC_GPIO_IN_DATA) & 1; |