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// Copyright 2023 The Pigweed Authors
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#include "pw_digital_io/digital_io.h"
#include <array>
#include "fsl_clock.h"
#include "fsl_gpio.h"
#include "fsl_reset.h"
#include "pw_assert/check.h"
#include "pw_digital_io_mcuxpresso/digital_io.h"
#include "pw_status/status.h"
namespace pw::digital_io {
namespace {
constexpr size_t kRt595ClockNum = 8;
constexpr size_t kRt595ResetNum = 8;
constexpr std::array<clock_ip_name_t, kRt595ClockNum> kGpioClocks = GPIO_CLOCKS;
constexpr std::array<reset_ip_name_t, kRt595ResetNum> kGpioResets = GPIO_RSTS_N;
} // namespace
McuxpressoDigitalOut::McuxpressoDigitalOut(GPIO_Type* base,
uint32_t port,
uint32_t pin,
pw::digital_io::State initial_state)
: base_(base), port_(port), pin_(pin), initial_state_(initial_state) {
PW_CHECK(base != nullptr);
PW_CHECK(port < kGpioClocks.size());
PW_CHECK(port < kGpioResets.size());
}
pw::Status McuxpressoDigitalOut::DoEnable(bool enable) {
if (enable) {
if (is_enabled()) {
return pw::OkStatus();
}
CLOCK_EnableClock(kGpioClocks[port_]);
RESET_ClearPeripheralReset(kGpioResets[port_]);
gpio_pin_config_t config = {
.pinDirection = kGPIO_DigitalOutput,
.outputLogic = static_cast<uint8_t>(
initial_state_ == pw::digital_io::State::kActive ? 1U : 0U),
};
GPIO_PinInit(base_, port_, pin_, &config);
} else {
// Set to input on disable.
gpio_pin_config_t config = {
.pinDirection = kGPIO_DigitalInput,
.outputLogic = 0,
};
GPIO_PinInit(base_, port_, pin_, &config);
// Can't disable clock as other users on same port may be active.
}
enabled_ = enable;
return pw::OkStatus();
}
pw::Status McuxpressoDigitalOut::DoSetState(pw::digital_io::State state) {
if (!is_enabled()) {
return pw::Status::FailedPrecondition();
}
GPIO_PinWrite(
base_, port_, pin_, state == pw::digital_io::State::kActive ? 1 : 0);
return pw::OkStatus();
}
McuxpressoDigitalIn::McuxpressoDigitalIn(GPIO_Type* base,
uint32_t port,
uint32_t pin)
: base_(base), port_(port), pin_(pin) {
PW_CHECK(base != nullptr);
PW_CHECK(port < kGpioClocks.size());
PW_CHECK(port < kGpioResets.size());
}
pw::Status McuxpressoDigitalIn::DoEnable(bool enable) {
if (!enable) {
enabled_ = enable;
// Can't disable clock as other users on same port may be active.
return pw::OkStatus();
}
if (is_enabled()) {
return pw::Status::FailedPrecondition();
}
CLOCK_EnableClock(kGpioClocks[port_]);
RESET_ClearPeripheralReset(kGpioResets[port_]);
gpio_pin_config_t config = {
.pinDirection = kGPIO_DigitalInput,
.outputLogic = 0,
};
GPIO_PinInit(base_, port_, pin_, &config);
enabled_ = enable;
return pw::OkStatus();
}
pw::Result<pw::digital_io::State> McuxpressoDigitalIn::DoGetState() {
if (!is_enabled()) {
return pw::Status::FailedPrecondition();
}
uint32_t value = GPIO_PinRead(base_, port_, pin_);
return value == 1 ? pw::digital_io::State::kActive
: pw::digital_io::State::kInactive;
}
} // namespace pw::digital_io
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