8727c4e2ec
Prior to this commit, if you configure a pin as an output type (I2C in this
example) and then later configure it back as an input, then it will report
the type incorrectly. Example:
>>> import machine
>>> b6 = machine.Pin('B6')
>>> b6
Pin(Pin.cpu.B6, mode=Pin.IN)
>>> machine.I2C(1)
I2C(1, scl=B6, sda=B7, freq=420000)
>>> b6
Pin(Pin.cpu.B6, mode=Pin.ALT_OPEN_DRAIN, pull=Pin.PULL_UP, af=Pin.AF4_I2C1)
>>> b6.init(machine.Pin.IN)
>>> b6
Pin(Pin.cpu.B6, mode=Pin.ALT_OPEN_DRAIN, af=Pin.AF4_I2C1)
With this commit the last print now works:
>>> b6
Pin(Pin.cpu.B6, mode=Pin.IN)
32 lines
1015 B
C
32 lines
1015 B
C
#include "py/obj.h"
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#include "pin.h"
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// Returns the pin mode. This value returned by this macro should be one of:
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// GPIO_MODE_INPUT, GPIO_MODE_OUTPUT_PP, GPIO_MODE_OUTPUT_OD,
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// GPIO_MODE_AF_PP, GPIO_MODE_AF_OD, or GPIO_MODE_ANALOG.
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uint32_t pin_get_mode(const pin_obj_t *pin) {
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GPIO_TypeDef *gpio = pin->gpio;
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uint32_t mode = (gpio->MODER >> (pin->pin * 2)) & 3;
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if (mode == GPIO_MODE_OUTPUT_PP || mode == GPIO_MODE_AF_PP) {
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if (gpio->OTYPER & pin->pin_mask) {
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mode |= 1 << 4; // Converts from xxx_PP to xxx_OD
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}
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}
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return mode;
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}
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// Returns the pin pullup/pulldown. The value returned by this macro should
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// be one of GPIO_NOPULL, GPIO_PULLUP, or GPIO_PULLDOWN.
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uint32_t pin_get_pull(const pin_obj_t *pin) {
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return (pin->gpio->PUPDR >> (pin->pin * 2)) & 3;
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}
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// Returns the af (alternate function) index currently set for a pin.
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uint32_t pin_get_af(const pin_obj_t *pin) {
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return (pin->gpio->AFR[pin->pin >> 3] >> ((pin->pin & 7) * 4)) & 0xf;
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}
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