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// Copyright 2021 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_spi/linux_spi.h"
#include <array>
#include <optional>
#include "gtest/gtest.h"
#include "pw_spi/chip_selector.h"
#include "pw_spi/device.h"
#include "pw_spi/initiator.h"
#include "pw_status/status.h"
#include "pw_sync/borrow.h"
namespace pw::spi {
namespace {
const pw::spi::Config kConfig = {.polarity = ClockPolarity::kActiveHigh,
.phase = ClockPhase::kFallingEdge,
.bits_per_word = BitsPerWord(8),
.bit_order = BitOrder::kMsbFirst};
class LinuxSpi : public ::testing::Test {
public:
LinuxSpi()
: initiator_(LinuxInitiator("/dev/spidev0.0", 1000000)),
chip_selector_(),
initiator_lock_(),
borrowable_initiator_(initiator_, initiator_lock_),
device_(borrowable_initiator_, kConfig, chip_selector_) {}
Device& device() { return device_; }
private:
LinuxInitiator initiator_;
LinuxChipSelector chip_selector_;
sync::VirtualMutex initiator_lock_;
sync::Borrowable<Initiator> borrowable_initiator_;
[[maybe_unused]] Device device_;
};
TEST_F(LinuxSpi, StartTransaction_Succeeds) {
// arrange
std::optional<Device::Transaction> transaction =
device().StartTransaction(ChipSelectBehavior::kPerWriteRead);
// act
// assert
EXPECT_TRUE(transaction.has_value());
}
TEST_F(LinuxSpi, HalfDuplexTransaction_Succeeds) {
// arrange
std::optional<Device::Transaction> transaction =
device().StartTransaction(ChipSelectBehavior::kPerWriteRead);
// act
ASSERT_TRUE(transaction.has_value());
std::array write_data{std::byte(1), std::byte(2), std::byte(3), std::byte(4)};
auto write_status = transaction->Write(ConstByteSpan(write_data));
std::array read_data{std::byte(1), std::byte(2), std::byte(3), std::byte(4)};
auto read_status = transaction->Read(read_data);
// assert
EXPECT_TRUE(write_status.ok());
EXPECT_TRUE(read_status.ok());
}
TEST_F(LinuxSpi, FullDuplexTransaction_Succeeds) {
// arrange
std::optional<Device::Transaction> transaction =
device().StartTransaction(ChipSelectBehavior::kPerWriteRead);
// act
ASSERT_TRUE(transaction.has_value());
std::array write_data{std::byte(1), std::byte(2), std::byte(3), std::byte(4)};
std::array read_data{std::byte(0), std::byte(0), std::byte(0), std::byte(0)};
auto wr_status = transaction->WriteRead(ConstByteSpan(write_data), read_data);
// assert
EXPECT_TRUE(wr_status.ok());
}
} // namespace
} // namespace pw::spi
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