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 #include "pw_digital_io/digital_io.h"
16
17 #include <array>
18
19 #include "fsl_clock.h"
20 #include "fsl_gpio.h"
21 #include "fsl_reset.h"
22 #include "pw_assert/check.h"
23 #include "pw_digital_io_mcuxpresso/digital_io.h"
24 #include "pw_status/status.h"
25
26 namespace pw::digital_io {
27 namespace {
28
29 constexpr std::array kGpioClocks = GPIO_CLOCKS;
30 constexpr std::array kGpioResets = GPIO_RSTS_N;
31
32 } // namespace
33
McuxpressoDigitalOut(GPIO_Type * base,uint32_t port,uint32_t pin,pw::digital_io::State initial_state)34 McuxpressoDigitalOut::McuxpressoDigitalOut(GPIO_Type* base,
35 uint32_t port,
36 uint32_t pin,
37 pw::digital_io::State initial_state)
38 : base_(base), port_(port), pin_(pin), initial_state_(initial_state) {
39 PW_CHECK(base != nullptr);
40 PW_CHECK(port < kGpioClocks.size());
41 PW_CHECK(port < kGpioResets.size());
42 }
43
DoEnable(bool enable)44 pw::Status McuxpressoDigitalOut::DoEnable(bool enable) {
45 if (enable) {
46 if (is_enabled()) {
47 return pw::OkStatus();
48 }
49
50 CLOCK_EnableClock(kGpioClocks[port_]);
51 RESET_ClearPeripheralReset(kGpioResets[port_]);
52
53 gpio_pin_config_t config = {
54 .pinDirection = kGPIO_DigitalOutput,
55 .outputLogic = static_cast<uint8_t>(
56 initial_state_ == pw::digital_io::State::kActive ? 1U : 0U),
57 };
58 GPIO_PinInit(base_, port_, pin_, &config);
59
60 } else {
61 // Set to input on disable.
62 gpio_pin_config_t config = {
63 .pinDirection = kGPIO_DigitalInput,
64 .outputLogic = 0,
65 };
66
67 // Must enable the clock, since GPIO can get disabled without ever
68 // being enabled.
69 CLOCK_EnableClock(kGpioClocks[port_]);
70 GPIO_PinInit(base_, port_, pin_, &config);
71
72 // Can't disable clock as other users on same port may be active.
73 }
74 enabled_ = enable;
75 return pw::OkStatus();
76 }
77
DoSetState(pw::digital_io::State state)78 pw::Status McuxpressoDigitalOut::DoSetState(pw::digital_io::State state) {
79 if (!is_enabled()) {
80 return pw::Status::FailedPrecondition();
81 }
82 GPIO_PinWrite(
83 base_, port_, pin_, state == pw::digital_io::State::kActive ? 1 : 0);
84 return pw::OkStatus();
85 }
86
McuxpressoDigitalIn(GPIO_Type * base,uint32_t port,uint32_t pin)87 McuxpressoDigitalIn::McuxpressoDigitalIn(GPIO_Type* base,
88 uint32_t port,
89 uint32_t pin)
90 : base_(base), port_(port), pin_(pin) {
91 PW_CHECK(base != nullptr);
92 PW_CHECK(port < kGpioClocks.size());
93 PW_CHECK(port < kGpioResets.size());
94 }
95
DoEnable(bool enable)96 pw::Status McuxpressoDigitalIn::DoEnable(bool enable) {
97 if (!enable) {
98 enabled_ = enable;
99 // Can't disable clock as other users on same port may be active.
100 return pw::OkStatus();
101 }
102
103 if (is_enabled()) {
104 return pw::Status::FailedPrecondition();
105 }
106
107 CLOCK_EnableClock(kGpioClocks[port_]);
108 RESET_ClearPeripheralReset(kGpioResets[port_]);
109
110 gpio_pin_config_t config = {
111 .pinDirection = kGPIO_DigitalInput,
112 .outputLogic = 0,
113 };
114 GPIO_PinInit(base_, port_, pin_, &config);
115
116 enabled_ = enable;
117 return pw::OkStatus();
118 }
119
DoGetState()120 pw::Result<pw::digital_io::State> McuxpressoDigitalIn::DoGetState() {
121 if (!is_enabled()) {
122 return pw::Status::FailedPrecondition();
123 }
124 uint32_t value = GPIO_PinRead(base_, port_, pin_);
125 return value == 1 ? pw::digital_io::State::kActive
126 : pw::digital_io::State::kInactive;
127 }
128
129 } // namespace pw::digital_io
130