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circuitpython/teensy/pin_defs_teensy.c

72 lines
2.0 KiB

#include <stdint.h>
#include <mk20dx128.h>
#include "py/runtime.h"
#include "py/mphal.h"
#include "pin.h"
// Returns the pin mode. This value returned by this macro should be one of:
// GPIO_MODE_INPUT, GPIO_MODE_OUTPUT_PP, GPIO_MODE_OUTPUT_OD,
// GPIO_MODE_AF_PP, GPIO_MODE_AF_OD, or GPIO_MODE_ANALOG.
uint32_t pin_get_mode(const pin_obj_t *pin) {
if (pin->gpio == NULL) {
// Analog only pin
return GPIO_MODE_ANALOG;
}
volatile uint32_t *port_pcr = GPIO_PIN_TO_PORT_PCR(pin->gpio, pin->pin);
uint32_t pcr = *port_pcr;
uint32_t af = (pcr & PORT_PCR_MUX_MASK) >> 8;
if (af == 0) {
return GPIO_MODE_ANALOG;
}
if (af == 1) {
if (pin->gpio->PDDR & (1 << pin->pin)) {
if (pcr & PORT_PCR_ODE) {
return GPIO_MODE_OUTPUT_OD;
}
return GPIO_MODE_OUTPUT_PP;
}
return GPIO_MODE_INPUT;
}
if (pcr & PORT_PCR_ODE) {
return GPIO_MODE_AF_OD;
}
return GPIO_MODE_AF_PP;
}
// Returns the pin pullup/pulldown. The value returned by this macro should
// be one of GPIO_NOPULL, GPIO_PULLUP, or GPIO_PULLDOWN.
uint32_t pin_get_pull(const pin_obj_t *pin) {
if (pin->gpio == NULL) {
// Analog only pin
return GPIO_NOPULL;
}
volatile uint32_t *port_pcr = GPIO_PIN_TO_PORT_PCR(pin->gpio, pin->pin);
uint32_t pcr = *port_pcr;
uint32_t af = (pcr & PORT_PCR_MUX_MASK) >> 8;
// pull is only valid for digital modes (hence the af > 0 test)
if (af > 0 && (pcr & PORT_PCR_PE) != 0) {
if (pcr & PORT_PCR_PS) {
return GPIO_PULLUP;
}
return GPIO_PULLDOWN;
}
return GPIO_NOPULL;
}
// Returns the af (alternate function) index currently set for a pin.
uint32_t pin_get_af(const pin_obj_t *pin) {
if (pin->gpio == NULL) {
// Analog only pin
return 0;
}
volatile uint32_t *port_pcr = GPIO_PIN_TO_PORT_PCR(pin->gpio, pin->pin);
return (*port_pcr & PORT_PCR_MUX_MASK) >> 8;
}