102 lines
3.0 KiB
C++
102 lines
3.0 KiB
C++
// Copyright 2021 The Pigweed Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy of
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// the License at
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//
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// https://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, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations under
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// the License.
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#include "pw_spi/linux_spi.h"
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#include <array>
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#include <optional>
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#include "gtest/gtest.h"
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#include "pw_spi/chip_selector.h"
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#include "pw_spi/device.h"
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#include "pw_spi/initiator.h"
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#include "pw_status/status.h"
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#include "pw_sync/borrow.h"
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namespace pw::spi {
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namespace {
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const pw::spi::Config kConfig = {.polarity = ClockPolarity::kActiveHigh,
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.phase = ClockPhase::kFallingEdge,
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.bits_per_word = BitsPerWord(8),
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.bit_order = BitOrder::kMsbFirst};
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class LinuxSpi : public ::testing::Test {
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public:
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LinuxSpi()
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: initiator_(LinuxInitiator("/dev/spidev0.0", 1000000)),
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chip_selector_(),
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initiator_lock_(),
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borrowable_initiator_(initiator_, initiator_lock_),
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device_(borrowable_initiator_, kConfig, chip_selector_) {}
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Device& device() { return device_; }
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private:
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LinuxInitiator initiator_;
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LinuxChipSelector chip_selector_;
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sync::VirtualMutex initiator_lock_;
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sync::Borrowable<Initiator> borrowable_initiator_;
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[[maybe_unused]] Device device_;
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};
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TEST_F(LinuxSpi, StartTransaction_Succeeds) {
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// arrange
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std::optional<Device::Transaction> transaction =
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device().StartTransaction(ChipSelectBehavior::kPerWriteRead);
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// act
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// assert
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EXPECT_TRUE(transaction.has_value());
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}
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TEST_F(LinuxSpi, HalfDuplexTransaction_Succeeds) {
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// arrange
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std::optional<Device::Transaction> transaction =
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device().StartTransaction(ChipSelectBehavior::kPerWriteRead);
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// act
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ASSERT_TRUE(transaction.has_value());
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std::array write_data{std::byte(1), std::byte(2), std::byte(3), std::byte(4)};
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auto write_status = transaction->Write(ConstByteSpan(write_data));
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std::array read_data{std::byte(1), std::byte(2), std::byte(3), std::byte(4)};
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auto read_status = transaction->Read(read_data);
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// assert
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EXPECT_TRUE(write_status.ok());
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EXPECT_TRUE(read_status.ok());
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}
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TEST_F(LinuxSpi, FullDuplexTransaction_Succeeds) {
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// arrange
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std::optional<Device::Transaction> transaction =
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device().StartTransaction(ChipSelectBehavior::kPerWriteRead);
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// act
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ASSERT_TRUE(transaction.has_value());
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std::array write_data{std::byte(1), std::byte(2), std::byte(3), std::byte(4)};
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std::array read_data{std::byte(0), std::byte(0), std::byte(0), std::byte(0)};
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auto wr_status = transaction->WriteRead(ConstByteSpan(write_data), read_data);
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// assert
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EXPECT_TRUE(wr_status.ok());
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}
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} // namespace
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} // namespace pw::spi
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