samples/GpioTestTool/main.cpp at develop · ERRLSTAR/samples · GitHub

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// GpioTestTool

// Utility to manipulate GPIO pins from the command line.

// Demonstrates how to use the GPIO WinRT APIs from standard

// C++ with WRL.

#include <windows.h>

#include <strsafe.h>

#include <wrl.h>

#include <string>

#include <vector>

#include <sstream>

#include <iostream>

#include <cwctype>

#include <windows.foundation.h>

#include <windows.devices.gpio.h>

using namespace ABI::Windows::Foundation;

using namespace ABI::Windows::Devices::Gpio;

using namespace Microsoft::WRL;

using namespace Microsoft::WRL::Wrappers;

typedef ITypedEventHandler<GpioPin *, GpioPinValueChangedEventArgs *>

IGpioPinValueChangedHandler;

class wexception

{

public:

explicit wexception (const std::wstring& Msg) : msg(Msg) { }

wexception (const wchar_t* Msg, ...) {

HRESULT hr;

WCHAR buf[512];

va_list argList;

va_start(argList, Msg);

hr = StringCchVPrintfW(

buf,

ARRAYSIZE(buf),

Msg,

argList);

va_end(argList);

this->msg = SUCCEEDED(hr) ? buf : Msg;

}

virtual ~wexception () { /*empty*/ }

virtual const wchar_t *wwhat () const

{

return this->msg.c_str();

}

private:

std::wstring msg;

};

ComPtr<IGpioController> MakeDefaultController ()

{

ComPtr<IGpioController> controller;

// get the activation factory

ComPtr<IGpioControllerStatics> controllerStatics;

HRESULT hr = GetActivationFactory(

HStringReference(RuntimeClass_Windows_Devices_Gpio_GpioController).Get(),

&controllerStatics);

if (FAILED(hr)) {

throw wexception(

L"Failed to get activation factory for %s. Please ensure the type "

L"is present on the system. (hr = 0x%x)",

RuntimeClass_Windows_Devices_Gpio_GpioController,

hr);

}

hr = controllerStatics->GetDefault(controller.GetAddressOf());

if (FAILED(hr)) {

throw wexception(

L"Failed to get instance of default GPIO controller. (hr = 0x%x)",

hr);

}

if (!controller) {

throw wexception(L"GPIO is not available on this system");

}

return controller;

}

ComPtr<IGpioPin> MakePin (int PinNumber)

{

auto controller = MakeDefaultController();

ComPtr<IGpioPin> pin;

HRESULT hr = controller->OpenPin(PinNumber, pin.GetAddressOf());

if (FAILED(hr)) {

throw wexception(L"Failed to open pin. (hr = 0x%x)", hr);

}

return pin;

}

void ListPins ()

{

auto controller = MakeDefaultController();

INT32 pinCount;

HRESULT hr = controller->get_PinCount(&pinCount);

if (FAILED(hr)) {

throw wexception(L"Failed to get pin count. (hr = 0x%x)", hr);

}

wprintf(L"The default GPIO controller has %d pins:\n", pinCount);

for (INT32 pinNumber = 0; pinNumber < pinCount; ++pinNumber) {

ComPtr<IGpioPin> pin;

hr = controller->OpenPin(pinNumber, pin.GetAddressOf());

switch (hr) {

case S_OK:

wprintf(L" Pin %d is available\n", pinNumber);

break;

case __HRESULT_FROM_WIN32(ERROR_SHARING_VIOLATION):

wprintf(L" Pin %d is currently in use\n", pinNumber);

break;

case __HRESULT_FROM_WIN32(ERROR_NOT_FOUND):

// pin is not available to applications; don't print anything

break;

default:

wprintf(

L" Pin %d: unexpected error occurred attempting to open. (hr = 0x%x)\n",

pinNumber,

hr);

}

GpioPinValue operator! (GpioPinValue Value)

{

return (Value == GpioPinValue_Low) ? GpioPinValue_High : GpioPinValue_Low;

}

std::wistream& operator>> (std::wistream& is, GpioPinValue& value)

{

int raw;

is >> raw;

if (is.fail()) {

return is;

}

switch (raw) {

case GpioPinValue_Low:

case GpioPinValue_High:

value = GpioPinValue(raw);

break;

default:

is.clear(is.failbit);

}

return is;

}

PCWSTR StringFromGpioPinValue (GpioPinValue value)

{

switch (value) {

case GpioPinValue_Low: return L"Low";

case GpioPinValue_High: return L"High";

default: return L"[invalid GpioPinValue]";

}

std::wistream& operator>> (std::wistream& is, GpioPinDriveMode& value)

{

is.clear();

std::wstring driveMode;

is >> driveMode;

if (!_wcsicmp(driveMode.c_str(), L"input")) {

value = GpioPinDriveMode_Input;

} else if (!_wcsicmp(driveMode.c_str(), L"output")) {

value = GpioPinDriveMode_Output;

} else if (!_wcsicmp(driveMode.c_str(), L"inputPullUp")) {

value = GpioPinDriveMode_InputPullUp;

} else if (!_wcsicmp(driveMode.c_str(), L"inputPullDown")) {

value = GpioPinDriveMode_InputPullDown;

} else {

is.clear(is.failbit);

}

return is;

}

PCWSTR StringFromGpioPinDriveMode (GpioPinDriveMode value)

{

switch (value) {

case GpioPinDriveMode_Input: return L"input";

case GpioPinDriveMode_Output: return L"output";

case GpioPinDriveMode_InputPullUp: return L"inputPullUp";

case GpioPinDriveMode_InputPullDown: return L"inputPullDown";

default: return L"[invalid GpioPinDriveMode]";

}

PCWSTR StringFromGpioSharingMode (GpioSharingMode value)

{

switch (value) {

case GpioSharingMode_Exclusive: return L"Exclusive";

case GpioSharingMode_SharedReadOnly: return L"SharedReadOnly";

default: return L"[invalid GpioSharingMode]";

}

PCWSTR StringFromGpioPinEdge (GpioPinEdge value)

{

switch (value) {

case GpioPinEdge_FallingEdge: return L"Falling";

case GpioPinEdge_RisingEdge: return L"Rising";

default: return L"[Invalid GpioPinEdge value]";

}

PCWSTR Help =

L"Commands:\n"

L" > write 0|1 Write pin low (0) or high (1)\n"

L" > high Alias for 'write 1'\n"

L" > low Alias for 'write 0'\n"

L" > toggle Toggle the pin from its current state\n"

L" > read Read pin\n"

L" > setdrivemode drive_mode Set the pins's drive mode\n"

L" where drive_mode = input|output|\n"

L" inputPullUp|inputPullDown\n"

L" > interrupt on|off Register or unregister for pin value\n"

L" change events.\n"

L" > info Dump information about the pin\n"

L" > help Display this help message\n"

L" > quit Quit\n";

void ShowPrompt (_In_ IGpioPin* pin)

{

auto listener = Callback<IGpioPinValueChangedHandler>([] (

_In_ IGpioPin* /*Pin*/,

_In_ IGpioPinValueChangedEventArgs* Args

) -> HRESULT

{

GpioPinEdge edge;

Args->get_Edge(&edge);

wprintf(L"%s edge occurred.\n", StringFromGpioPinEdge(edge));

return S_OK;

});

auto token = EventRegistrationToken();

bool listenerRegistered = false;

GpioPinValue outputLatch = GpioPinValue_High;

while (std::wcin) {

wprintf(L"> ");

std::wstring line;

if (!std::getline(std::wcin, line)) {

return;

}

std::wistringstream linestream(line);

std::wstring command;

linestream >> command;

if ((command == L"q") || (command == L"quit")) {

return;

} else if ((command == L"h") || (command == L"help")) {

wprintf(L"%s\n", Help);

} else if ((command == L"w") || (command == L"write")) {

GpioPinValue value;

linestream >> value;

if (linestream.fail()) {

wprintf(L"Syntax error: expecting 0 or 1\nUsage: write 0|1\n");

continue;

}

HRESULT hr = pin->Write(value);

if (FAILED(hr)) {

wprintf(L"Failed to write pin. (hr = 0x%x)\n", hr);

continue;

}

} else if (command == L"high") {

HRESULT hr = pin->Write(GpioPinValue_High);

if (FAILED(hr)) {

wprintf(L"Failed to write pin. (hr = 0x%x)\n", hr);

continue;

}

} else if (command == L"low") {

HRESULT hr = pin->Write(GpioPinValue_Low);

if (FAILED(hr)) {

wprintf(L"Failed to write pin. (hr = 0x%x)\n", hr);

continue;

}

} else if ((command == L"t") || (command == L"toggle")) {

outputLatch = !outputLatch;

HRESULT hr = pin->Write(outputLatch);

if (FAILED(hr)) {

wprintf(L"Failed to write pin. (hr = 0x%x)\n", hr);

continue;

}

} else if ((command == L"r") || (command == L"read")) {

GpioPinValue value;

HRESULT hr = pin->Read(&value);

if (FAILED(hr)) {

wprintf(L"Failed to read pin. (hr = 0x%x)\n", hr);

continue;

}

wprintf(L"%s\n", StringFromGpioPinValue(value));

} else if (command == L"setdrivemode") {

GpioPinDriveMode driveMode;

linestream >> driveMode;

if (!linestream) {

wprintf(L"Syntax error: expecting valid drive mode. Type 'help' for usage.\n");

continue;

}

HRESULT hr = pin->SetDriveMode(driveMode);

if (FAILED(hr)) {

wprintf(L"Failed to set drive mode. (hr = 0x%x)\n", hr);

continue;

}

} else if ((command == L"int") || (command == L"interrupt")) {

std::wstring onOrOff;

linestream >> onOrOff;

if (onOrOff == L"on") {

if (listenerRegistered) {

wprintf(L"Interrupt listener already registered.\n");

continue;

}

HRESULT hr = pin->add_ValueChanged(listener.Get(), &token);

if (FAILED(hr)) {

wprintf(

L"Failed to add event listener to ValueChanged event. (hr = 0x%x)\n",

hr);

continue;

}

listenerRegistered = true;

} else if (onOrOff == L"off") {

if (!listenerRegistered) {

wprintf(L"No interrupt listener is currently registered.\n");

continue;

}

HRESULT hr = pin->remove_ValueChanged(token);

if (FAILED(hr)) {

wprintf(

L"Failed to remove ValueChanged event. (hr = 0x%x)\n",

hr);

continue;

}

listenerRegistered = false;

} else {

wprintf(

L"Expecting 'on' or 'off': %s. Type 'help' for usage.\n",

onOrOff.c_str());

}

} else if ((command == L"i") || (command == L"info")) {

int pinNumber;

pin->get_PinNumber(&pinNumber);

GpioSharingMode sharingMode;

pin->get_SharingMode(&sharingMode);

TimeSpan debounceTimeout;

pin->get_DebounceTimeout(&debounceTimeout);

GpioPinDriveMode driveMode;

pin->GetDriveMode(&driveMode);

GpioPinValue value;

pin->Read(&value);

wprintf(

L" Pin Number: %d\n"

L" Sharing Mode: %s\n"

L" Debounce Timeout: %d ms\n"

L" Drive Mode: %s\n"

L" Value: %s\n",

pinNumber,

StringFromGpioSharingMode(sharingMode),

int(debounceTimeout.Duration / 10000LL),

StringFromGpioPinDriveMode(driveMode),

StringFromGpioPinValue(value));

} else if (command.empty()) {

// ignore

} else {

wprintf(

L"Unrecognized command: %s. Type 'help' for command usage.\n",

command.c_str());

}

PCWSTR Usage =

L"GpioTestTool: Command line GPIO testing utility\n"

L"Usage: %s [-list] PinNumber\n"

L"\n"

L" -list List the available pins on the default GPIO controller.\n"

L" PinNumber The pin number with which you wish to interact. This\n"

L" parameter is required.\n"

L"\n"

L"Example:\n"

L" %s -list\n"

L" %s 47\n";

void PrintUsage (PCWSTR name)

{

wprintf(Usage, name, name, name);

}

int __cdecl wmain (_In_ int argc, _In_reads_(argc) wchar_t *argv[])

{

enum MainReturnValue { Success, Failure };

if (argc < 2) {

fwprintf(

stderr,

L"Missing required command line parameter PinNumber\n\n");

PrintUsage(argv[0]);

return Success;

}

PCWSTR arg = argv[1];

if (!_wcsicmp(arg, L"-h") || !_wcsicmp(arg, L"/h") ||

!_wcsicmp(arg, L"-?") || !_wcsicmp(arg, L"/?")) {

PrintUsage(argv[0]);

return Success;

}

RoInitializeWrapper roInit(RO_INIT_MULTITHREADED);

try {

if (!_wcsicmp(arg, L"-list") || !_wcsicmp(arg, L"/list")) {

ListPins();

return Success;

} else {

std::wistringstream is(arg);

INT32 pinNumber;

is >> pinNumber;

if (!is) {

fwprintf(

stderr,

L"Expecting integer: %s\nType %s /? for usage.\n",

arg,

argv[0]);

return Failure;

}

auto pin = MakePin(pinNumber);

wprintf(L"Type 'help' for a list of commands\n");

ShowPrompt(pin.Get());

return Success;

}

} catch (const wexception& ex) {

fwprintf(stderr, L"Error: %s\n", ex.wwhat());

return Failure;

}

samples/GpioTestTool/main.cpp at develop · ERRLSTAR/samples · GitHub

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