116 lines
3.9 KiB
C
116 lines
3.9 KiB
C
/*
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* This file is part of Adafruit for EFR32 project
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*
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* The MIT License (MIT)
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*
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* Copyright 2023 Silicon Laboratories Inc. www.silabs.com
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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 "shared-bindings/microcontroller/Pin.h"
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#include "shared-bindings/digitalio/DigitalInOut.h"
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#include "py/mphal.h"
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#include "em_gpio.h"
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#define GPIO_PORT_COUNT (MP_ARRAY_SIZE(ports))
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GPIO_Port_TypeDef ports[] = {gpioPortA, gpioPortB, gpioPortC, gpioPortD};
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STATIC uint16_t claimed_pins[GPIO_PORT_COUNT];
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STATIC uint16_t __ALIGNED(4) never_reset_pins[GPIO_PORT_COUNT];
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// Reset all pin except pin in never_reset_pins list
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void reset_all_pins(void) {
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uint8_t pin_num;
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uint8_t port_num;
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// Reset claimed pins
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for (pin_num = 0; pin_num < GPIO_PORT_COUNT; pin_num++) {
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claimed_pins[pin_num] = never_reset_pins[pin_num];
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}
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for (port_num = 0; port_num < GPIO_PORT_COUNT; port_num++) {
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for (pin_num = 0; pin_num < 16; pin_num++) {
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if (GPIO_PORT_PIN_VALID(ports[port_num],pin_num)
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&& !(never_reset_pins[port_num] >> pin_num & 0x01)) {
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GPIO_PinModeSet(ports[port_num], pin_num,gpioModeInput,1);
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}
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}
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}
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}
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// Mark pin as free and return it to a quiescent state.
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void reset_pin_number(uint8_t pin_port, uint8_t pin_number) {
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// Clear claimed bit & reset
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claimed_pins[pin_port] &= ~(1 << pin_number);
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never_reset_pins[pin_port] &= ~(1 << pin_number);
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GPIO_PinModeSet(pin_port, pin_number, gpioModeInput, 1);
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}
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// Mark pin as never reset
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void never_reset_pin_number(uint8_t pin_port, uint8_t pin_number) {
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never_reset_pins[pin_port] |= 1 << pin_number;
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// Make sure never reset pins are also always claimed
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claimed_pins[pin_port] |= 1 << pin_number;
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}
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// Mark pin as never reset
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void common_hal_never_reset_pin(const mcu_pin_obj_t *pin) {
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never_reset_pin_number(pin->port, pin->number);
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}
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// Reset pin
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void common_hal_reset_pin(const mcu_pin_obj_t *pin) {
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if (pin == NULL) {
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return;
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}
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reset_pin_number(pin->port, pin->number);
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}
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// Mark pin as in used
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void claim_pin(uint8_t pin_port, uint8_t pin_number) {
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// Set bit in claimed_pins bitmask.
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claimed_pins[pin_port] |= 1 << pin_number;
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}
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// Check pin status free or in used
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bool pin_number_is_free(uint8_t pin_port, uint8_t pin_number) {
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return !(claimed_pins[pin_port] & (1 << pin_number));
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}
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// Check pin status free or in used
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bool common_hal_mcu_pin_is_free(const mcu_pin_obj_t *pin) {
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return pin_number_is_free(pin->port, pin->number);
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}
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// Calculate pin number for a pin obj
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uint8_t common_hal_mcu_pin_number(const mcu_pin_obj_t *pin) {
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return pin->port * 16 + pin->number;
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}
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// Mark pin is in used
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void common_hal_mcu_pin_claim(const mcu_pin_obj_t *pin) {
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claim_pin(pin->port, pin->number);
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}
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// Reset pin by pin number
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void common_hal_mcu_pin_reset_number(uint8_t pin_no) {
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reset_pin_number(pin_no / 16, pin_no % 16);
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}
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