110 lines
3.4 KiB
C
110 lines
3.4 KiB
C
/*
|
|
* This file is part of the MicroPython project, http://micropython.org/
|
|
*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2021 Scott Shawcroft for Adafruit Industries
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#include "shared-bindings/microcontroller/Pin.h"
|
|
|
|
#include "peripherals/broadcom/gpio.h"
|
|
|
|
STATIC bool pin_in_use[BCM_PIN_COUNT];
|
|
STATIC bool never_reset_pin[BCM_PIN_COUNT];
|
|
|
|
void reset_all_pins(void) {
|
|
for (size_t i = 0; i < BCM_PIN_COUNT; i++) {
|
|
if (never_reset_pin[i]) {
|
|
continue;
|
|
}
|
|
reset_pin_number(i);
|
|
}
|
|
}
|
|
|
|
void never_reset_pin_number(uint8_t pin_number) {
|
|
never_reset_pin[pin_number] = true;
|
|
}
|
|
|
|
void reset_pin_number(uint8_t pin_number) {
|
|
pin_in_use[pin_number] = false;
|
|
never_reset_pin[pin_number] = false;
|
|
// Reset JTAG pins back to JTAG.
|
|
BP_PULL_Enum pull = BP_PULL_NONE;
|
|
if (22 <= pin_number && pin_number <= 27) {
|
|
gpio_set_function(pin_number, GPIO_FUNCTION_ALT4);
|
|
} else {
|
|
gpio_set_function(pin_number, GPIO_FUNCTION_INPUT);
|
|
}
|
|
// Set the pull to match the datasheet.
|
|
if (pin_number < 9 ||
|
|
(33 < pin_number && pin_number < 37) ||
|
|
pin_number > 45) {
|
|
pull = BP_PULL_UP;
|
|
} else if (pin_number != 28 &&
|
|
pin_number != 29 &&
|
|
pin_number != 44 &&
|
|
pin_number != 45) {
|
|
// Most pins are pulled low so we only exclude the four pins that aren't
|
|
// pulled at all. This will also set the JTAG pins 22-27
|
|
pull = BP_PULL_DOWN;
|
|
}
|
|
gpio_set_pull(pin_number, pull);
|
|
}
|
|
|
|
void common_hal_never_reset_pin(const mcu_pin_obj_t *pin) {
|
|
if (pin == NULL) {
|
|
return;
|
|
}
|
|
never_reset_pin_number(pin->number);
|
|
}
|
|
|
|
void common_hal_reset_pin(const mcu_pin_obj_t *pin) {
|
|
if (pin == NULL) {
|
|
return;
|
|
}
|
|
reset_pin_number(pin->number);
|
|
}
|
|
|
|
void claim_pin(const mcu_pin_obj_t *pin) {
|
|
pin_in_use[pin->number] = true;
|
|
}
|
|
|
|
bool pin_number_is_free(uint8_t pin_number) {
|
|
return !pin_in_use[pin_number];
|
|
}
|
|
|
|
bool common_hal_mcu_pin_is_free(const mcu_pin_obj_t *pin) {
|
|
return pin_number_is_free(pin->number);
|
|
}
|
|
|
|
uint8_t common_hal_mcu_pin_number(const mcu_pin_obj_t *pin) {
|
|
return pin->number;
|
|
}
|
|
|
|
void common_hal_mcu_pin_claim(const mcu_pin_obj_t *pin) {
|
|
return claim_pin(pin);
|
|
}
|
|
|
|
void common_hal_mcu_pin_reset_number(uint8_t pin_no) {
|
|
reset_pin_number(pin_no);
|
|
}
|