mirror of https://github.com/ARMmbed/mbed-os.git
118 lines
2.9 KiB
C
118 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 "port_api.h"
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#include "psoc6_utils.h"
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#include "mbed_error.h"
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static void port_init_pins(port_t *obj)
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{
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uint32_t pin;
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uint32_t cy_mode;
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MBED_ASSERT(obj);
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MBED_ASSERT(obj->port);
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cy_mode = gpio_get_cy_drive_mode(obj->direction, obj->mode);
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for (pin = 0; pin < 8; ++pin) {
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if (obj->mask & (1 << pin)) {
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Cy_GPIO_Pin_FastInit(obj->port, pin, cy_mode, 0, HSIOM_SEL_GPIO);
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}
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}
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// Force output to enable pulls.
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if (obj->direction == PIN_INPUT) {
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switch (cy_mode) {
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case CY_GPIO_DM_PULLUP:
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port_write(obj, 0xff);
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break; // Force output to enable pulls.
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case CY_GPIO_DM_PULLDOWN:
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port_write(obj, 0);
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break;
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}
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}
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}
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void port_init(port_t *obj, PortName port, int mask, PinDirection dir)
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{
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uint32_t pin;
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MBED_ASSERT(obj);
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for (pin = 0; pin < 8; ++pin) {
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if (mask & (1 << pin)) {
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if (cy_reserve_io_pin((PinName)((port << 8)+pin))) {
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error("Port pin reservation conflict.");
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}
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}
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}
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obj->port_id = port;
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obj->port = Cy_GPIO_PortToAddr(port);
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obj->mask = mask & 0xff; // Only 8 bits exist on a port in PSoC.
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obj->direction = dir;
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obj->mode = PullDefault;
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port_init_pins(obj);
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}
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void port_mode(port_t *obj, PinMode mode)
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{
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MBED_ASSERT(obj);
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MBED_ASSERT(obj->port);
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obj->mode = mode;
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port_init_pins(obj);
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}
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void port_dir(port_t *obj, PinDirection dir)
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{
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MBED_ASSERT(obj);
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MBED_ASSERT(obj->port);
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obj->direction = dir;
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port_init_pins(obj);
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}
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void port_write(port_t *obj, int value)
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{
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MBED_ASSERT(obj);
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MBED_ASSERT(obj->port);
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if (obj->mask == 0xff) {
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obj->port->OUT = value;
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} else {
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// In case some bits are used for different functionality we need to write
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// each bit separately to not break things out, eg. pull up state on other bits.
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uint32_t pin;
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for (pin = 0; pin < 8; ++pin) {
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if (obj->mask & (1 << pin)) {
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Cy_GPIO_Write(obj->port, pin, value & 0x1);
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value >>= 1;
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}
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}
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}
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}
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int port_read(port_t *obj)
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{
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return obj->port->IN & obj->mask;
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}
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