217 lines
7.5 KiB
C
217 lines
7.5 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdint.h>
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#include <string.h>
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#include "py/runtime.h"
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#include "py/mphal.h"
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#include "hal/include/hal_gpio.h"
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#include "common-hal/microcontroller/Pin.h"
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#include "shared-bindings/digitalio/DigitalInOut.h"
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#include "supervisor/shared/translate/translate.h"
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digitalinout_result_t common_hal_digitalio_digitalinout_construct(
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digitalio_digitalinout_obj_t *self, const mcu_pin_obj_t *pin) {
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claim_pin(pin);
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self->pin = pin;
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self->output = false;
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self->open_drain = false;
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// Must set pull after setting direction.
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gpio_set_pin_direction(pin->number, GPIO_DIRECTION_IN);
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gpio_set_pin_pull_mode(pin->number, GPIO_PULL_OFF);
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return DIGITALINOUT_OK;
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}
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void common_hal_digitalio_digitalinout_never_reset(
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digitalio_digitalinout_obj_t *self) {
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never_reset_pin_number(self->pin->number);
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}
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bool common_hal_digitalio_digitalinout_deinited(digitalio_digitalinout_obj_t *self) {
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return self->pin == NULL;
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}
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void common_hal_digitalio_digitalinout_deinit(digitalio_digitalinout_obj_t *self) {
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if (common_hal_digitalio_digitalinout_deinited(self)) {
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return;
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}
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reset_pin_number(self->pin->number);
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self->pin = NULL;
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}
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void common_hal_digitalio_digitalinout_switch_to_input(
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digitalio_digitalinout_obj_t *self, digitalio_pull_t pull) {
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self->output = false;
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// This also sets direction to input.
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common_hal_digitalio_digitalinout_set_pull(self, pull);
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}
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digitalinout_result_t common_hal_digitalio_digitalinout_switch_to_output(
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digitalio_digitalinout_obj_t *self, bool value,
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digitalio_drive_mode_t drive_mode) {
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const uint8_t pin = self->pin->number;
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gpio_set_pin_pull_mode(pin, GPIO_PULL_OFF);
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// Turn on "strong" pin driving (more current available). See DRVSTR doc in datasheet.
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hri_port_set_PINCFG_DRVSTR_bit(PORT, (enum gpio_port)GPIO_PORT(pin), GPIO_PIN(pin));
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self->output = true;
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self->open_drain = drive_mode == DRIVE_MODE_OPEN_DRAIN;
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// Direction is set in set_value. We don't need to do it here.
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common_hal_digitalio_digitalinout_set_value(self, value);
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return DIGITALINOUT_OK;
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}
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digitalio_direction_t common_hal_digitalio_digitalinout_get_direction(
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digitalio_digitalinout_obj_t *self) {
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return self->output ? DIRECTION_OUTPUT : DIRECTION_INPUT;
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}
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void common_hal_digitalio_digitalinout_set_value(
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digitalio_digitalinout_obj_t *self, bool value) {
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const uint8_t pin = self->pin->number;
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const uint8_t port = GPIO_PORT(pin);
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const uint32_t pin_mask = 1U << GPIO_PIN(pin);
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if (value) {
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if (self->open_drain) {
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// Assertion: pull is off, so the pin is floating in this case.
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// We do open-drain high output (no sinking of current)
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// by changing the direction to input with no pulls.
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hri_port_clear_DIR_DIR_bf(PORT, port, pin_mask);
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} else {
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hri_port_set_DIR_DIR_bf(PORT, port, pin_mask);
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hri_port_set_OUT_OUT_bf(PORT, port, pin_mask);
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}
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} else {
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hri_port_set_DIR_DIR_bf(PORT, port, pin_mask);
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hri_port_clear_OUT_OUT_bf(PORT,port, pin_mask);
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}
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}
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bool common_hal_digitalio_digitalinout_get_value(
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digitalio_digitalinout_obj_t *self) {
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const uint8_t pin = self->pin->number;
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if (!self->output) {
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return gpio_get_pin_level(pin);
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} else {
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if (self->open_drain && hri_port_get_DIR_reg(PORT, GPIO_PORT(pin), 1U << GPIO_PIN(pin)) == 0) {
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return true;
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} else {
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return hri_port_get_OUT_reg(PORT, GPIO_PORT(pin), 1U << GPIO_PIN(pin));
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}
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}
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}
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digitalinout_result_t common_hal_digitalio_digitalinout_set_drive_mode(
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digitalio_digitalinout_obj_t *self,
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digitalio_drive_mode_t drive_mode) {
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bool value = common_hal_digitalio_digitalinout_get_value(self);
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self->open_drain = drive_mode == DRIVE_MODE_OPEN_DRAIN;
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// True is implemented differently between modes so reset the value to make
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// sure it's correct for the new mode.
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if (value) {
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common_hal_digitalio_digitalinout_set_value(self, value);
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}
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return DIGITALINOUT_OK;
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}
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digitalio_drive_mode_t common_hal_digitalio_digitalinout_get_drive_mode(
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digitalio_digitalinout_obj_t *self) {
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if (self->open_drain) {
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return DRIVE_MODE_OPEN_DRAIN;
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} else {
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return DRIVE_MODE_PUSH_PULL;
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}
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}
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void common_hal_digitalio_digitalinout_set_pull(
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digitalio_digitalinout_obj_t *self, digitalio_pull_t pull) {
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enum gpio_pull_mode asf_pull = GPIO_PULL_OFF;
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switch (pull) {
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case PULL_UP:
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asf_pull = GPIO_PULL_UP;
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break;
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case PULL_DOWN:
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asf_pull = GPIO_PULL_DOWN;
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break;
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case PULL_NONE:
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default:
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break;
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}
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// Must set pull after setting direction.
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gpio_set_pin_direction(self->pin->number, GPIO_DIRECTION_IN);
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gpio_set_pin_pull_mode(self->pin->number, asf_pull);
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}
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digitalio_pull_t common_hal_digitalio_digitalinout_get_pull(
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digitalio_digitalinout_obj_t *self) {
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uint32_t pin = self->pin->number;
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if (self->output) {
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mp_raise_AttributeError(translate("Cannot get pull while in output mode"));
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return PULL_NONE;
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} else {
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if (hri_port_get_PINCFG_PULLEN_bit(PORT, GPIO_PORT(pin), GPIO_PIN(pin)) == 0) {
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return PULL_NONE;
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}
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if (hri_port_get_OUT_reg(PORT, GPIO_PORT(pin), 1U << GPIO_PIN(pin)) > 0) {
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return PULL_UP;
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} else {
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return PULL_DOWN;
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}
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}
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}
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bool common_hal_digitalio_has_reg_op(digitalinout_reg_op_t op) {
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return true;
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}
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volatile uint32_t *common_hal_digitalio_digitalinout_get_reg(digitalio_digitalinout_obj_t *self, digitalinout_reg_op_t op, uint32_t *mask) {
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const uint8_t pin = self->pin->number;
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int port = GPIO_PORT(pin);
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*mask = 1u << GPIO_PIN(pin);
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switch (op) {
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case DIGITALINOUT_REG_READ:
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return (volatile uint32_t *)&PORT->Group[port].IN.reg;
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case DIGITALINOUT_REG_WRITE:
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return &PORT->Group[port].OUT.reg;
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case DIGITALINOUT_REG_SET:
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return &PORT->Group[port].OUTSET.reg;
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case DIGITALINOUT_REG_RESET:
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return &PORT->Group[port].OUTCLR.reg;
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case DIGITALINOUT_REG_TOGGLE:
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return &PORT->Group[port].OUTTGL.reg;
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default:
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return NULL;
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}
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}
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