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// Copyright 2022 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.
#pragma once
#include "fsl_clock.h"
#include "fsl_i2c.h"
#include "pw_i2c/initiator.h"
#include "pw_sync/interrupt_spin_lock.h"
#include "pw_sync/lock_annotations.h"
#include "pw_sync/mutex.h"
#include "pw_sync/timed_thread_notification.h"
namespace pw::i2c {
// Initiator interface implementation based on I2C driver in NXP MCUXpresso SDK.
// Currently supports only devices with 7 bit adresses.
class McuxpressoInitiator final : public Initiator {
public:
struct Config {
uint32_t flexcomm_address;
clock_name_t clock_name;
uint32_t baud_rate_bps;
};
McuxpressoInitiator(const Config& config)
: config_(config),
base_(reinterpret_cast<I2C_Type*>(config_.flexcomm_address)) {}
// Should be called before attempting any transfers.
void Enable() PW_LOCKS_EXCLUDED(mutex_);
void Disable() PW_LOCKS_EXCLUDED(mutex_);
~McuxpressoInitiator() final;
private:
Status DoWriteReadFor(Address device_address,
ConstByteSpan tx_buffer,
ByteSpan rx_buffer,
chrono::SystemClock::duration timeout) override
PW_LOCKS_EXCLUDED(mutex_);
// inclusive-language: disable
Status InitiateNonBlockingTransfer(chrono::SystemClock::duration rw_timeout,
i2c_master_transfer_t* transfer)
PW_LOCKS_EXCLUDED(callback_isl_);
// Non-blocking I2C transfer callback.
static void TransferCompleteCallback(I2C_Type* base,
i2c_master_handle_t* handle,
status_t status,
void* initiator_ptr)
PW_GUARDED_BY(callback_isl_);
// inclusive-language: enable
sync::Mutex mutex_;
Config const config_;
I2C_Type* const base_;
bool enabled_ PW_GUARDED_BY(mutex_);
// Transfer completion status for non-blocking I2C transfer.
sync::TimedThreadNotification callback_complete_notification_;
sync::InterruptSpinLock callback_isl_;
status_t transfer_status_ PW_GUARDED_BY(callback_isl_);
// inclusive-language: disable
i2c_master_handle_t handle_ PW_GUARDED_BY(mutex_);
// inclusive-language: enable
};
} // namespace pw::i2c
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