mirror of https://github.com/ARMmbed/mbed-os.git
100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
/*
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* mbed Microcontroller Library
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* Copyright (c) 2017-2018 Future Electronics
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "cmsis.h"
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#include "device.h"
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#include "mbed_assert.h"
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#include "gpio_object.h"
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#include "psoc6_utils.h"
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#include "mbed_error.h"
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#include "rtx_lib.h"
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static inline void gpio_set_dir_mode(gpio_t *obj)
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{
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MBED_ASSERT(obj);
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MBED_ASSERT(obj->port);
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MBED_ASSERT(obj->pin != NC);
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uint32_t pin = CY_PIN(obj->pin);
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uint32_t cymode = gpio_get_cy_drive_mode(obj->dir, obj->mode);
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Cy_GPIO_SetDrivemode(obj->port, pin, cymode);
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if (obj->dir == PIN_INPUT) {
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// Force output to enable pulls.
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switch (cymode) {
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case CY_GPIO_DM_PULLUP:
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Cy_GPIO_Write(obj->port, pin, 1);
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break;
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case CY_GPIO_DM_PULLDOWN:
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Cy_GPIO_Write(obj->port, pin, 0);
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break;
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}
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}
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}
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void gpio_init(gpio_t *obj, PinName pin)
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{
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MBED_ASSERT(obj);
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obj->pin = pin;
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obj->dir = PIN_INPUT;
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obj->mode = PullNone;
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if (pin == NC) {
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return;
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}
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MBED_ASSERT(CY_PIN(obj->pin) < 8); // PSoC6 architecture supports 8 pins per port.
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/*
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* Perform i/o reservation only if this is called outside of critical section/interrupt context.
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* This is a workaround for mbed_die() implementation, which configures LED1 inside critical section.
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* Normally user is advised to perform all of the i/o configuration at the program beginning,
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* or elsewhere in the running thread context. when we detect that we are in the wrong context here,
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* we assume it's explicitly called from mbed_die() or other fault handling, so eventual forcing
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* of the pin mode is deliberate and should not cause more problems.
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*/
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if (!(IsIrqMode() || IsIrqMasked())) {
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if (cy_reserve_io_pin(pin)) {
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error("GPIO pin reservation conflict.");
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}
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}
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obj->port = Cy_GPIO_PortToAddr(CY_PORT(obj->pin));
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const uint32_t outputVal = 0;
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Cy_GPIO_Pin_FastInit(obj->port, CY_PIN(obj->pin), CY_GPIO_DM_HIGHZ, outputVal, HSIOM_SEL_GPIO);
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}
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void gpio_mode(gpio_t *obj, PinMode mode)
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{
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MBED_ASSERT(obj);
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MBED_ASSERT(obj->pin != NC);
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obj->mode = mode;
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gpio_set_dir_mode(obj);
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}
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void gpio_dir(gpio_t *obj, PinDirection direction)
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{
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MBED_ASSERT(obj);
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MBED_ASSERT(obj->pin != NC);
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obj->dir = direction;
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gpio_set_dir_mode(obj);
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}
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