1 // Copyright 2023 The Pigweed Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not 4 // use this file except in compliance with the License. You may obtain a copy of 5 // the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12 // License for the specific language governing permissions and limitations under 13 // the License. 14 15 #pragma once 16 17 #include "pw_digital_io/digital_io.h" 18 #include "pw_spi/chip_selector.h" 19 20 namespace pw::spi { 21 22 /// An implementation of pw::spi::ChipSelector that sets the state of a 23 /// pw_digital_io output when activated. 24 class DigitalOutChipSelector : public ChipSelector { 25 public: DigitalOutChipSelector(pw::digital_io::DigitalOut & cs_pin)26 constexpr DigitalOutChipSelector(pw::digital_io::DigitalOut& cs_pin) 27 : cs_pin_(cs_pin) {} 28 29 /// Set a pw::digital_io::DigitalOut state as a chip select signal. 30 /// 31 /// @param[active] true Set the DigitalOut to kActive 32 /// @param[active] false Set the DigitalOut to kInactive SetActive(bool active)33 inline Status SetActive(bool active) override { 34 return cs_pin_.SetState(active ? pw::digital_io::State::kActive 35 : pw::digital_io::State::kInactive); 36 } 37 38 private: 39 pw::digital_io::DigitalOut& cs_pin_; 40 }; 41 42 } // namespace pw::spi 43