GPIO

Overview

Generally, a general-purpose input/output (GPIO) controller manages all GPIO pins by group. Each group of GPIO pins is associated with one or more registers. The GPIO pins are operated by reading data from and writing data to the registers.

The GPIO APIs define a set of standard functions for performing operations on GPIO pins, including:

  • Setting the pin direction, which can be input or output (high impedance is not supported currently)

  • Reading and writing level values, which can be low or high

  • Setting an interrupt service routine (ISR) function and interrupt trigger mode for a pin

  • Enabling or disabling interrupts for a pin

Available APIs

Table 1 APIs available for the GPIO driver

Capability

Function

Description

GPIO read/write

GpioRead

Reads the level value of a GPIO pin.

GpioWrite

Writes the level value of a GPIO pin.

GPIO settings

GpioSetDir

Sets the direction for a GPIO pin.

GpioGetDir

Obtains the direction for a GPIO pin.

GPIO interrupt settings

GpioSetIrq

Sets the ISR function for a GPIO pin.

GpioUnSetIrq

Cancels the setting of the ISR function for a GPIO pin.

GpioEnableIrq

Enables GPIO interrupts for a pin.

GpioDisableIrq

Disables GPIO interrupts for a pin.

NOTE
All functions provided in this document can be called only in kernel mode.

Usage Guidelines

How to Use

The GPIO APIs use the GPIO pin number to specify a pin. The figure below illustrates how to use the APIs.

Figure 1 Using GPIO driver APIs

Determining the GPIO Pin Number

The method for converting GPIO pin numbers varies depending on the GPIO controller model, parameters, and controller driver of different system on chips (SoCs).

  • Hi3516DV300

    A controller manages 12 groups of GPIO pins. Each group contains 8 GPIO pins.

    GPIO pin number = GPIO group index x Number of GPIO pins in each group + Offset in the group

    The group index ranges from 0 to 11.

    Example:

    GPIO pin number of GPIO10_3 = 10 x 8 + 3 = 83

  • Hi3518EV300

    A controller manages 10 groups of GPIO pins. Each group contains 10 GPIO pins.

    GPIO pin number = GPIO group index (0–9) x Number of GPIO pins in each group (10) + Offset in the group

    The group index ranges from 0 to 9.

    Example:

    GPIO pin number of GPIO7_3 = 7 x 10 + 3 = 73

Using APIs to Operate GPIO Pins

  • Set the direction for a GPIO pin.

    Before performing read/write operations on a GPIO pin, call GpioSetDir() to set the direction.

    int32_t GpioSetDir(uint16_t gpio, uint16_t dir);

Table 2 Description of GpioSetDir

<a name="table63111557616"></a>
<table><tbody><tr id="row17311165469"><td class="cellrowborder" valign="top" width="48.120000000000005%"><p id="p53110515616"><a name="p53110515616"></a><a name="p53110515616"></a><strong id="b1142022718160"><a name="b1142022718160"></a><a name="b1142022718160"></a>Parameter</strong></p>
</td>
<td class="cellrowborder" valign="top" width="51.88%"><p id="p5311454616"><a name="p5311454616"></a><a name="p5311454616"></a><strong id="b93161228141614"><a name="b93161228141614"></a><a name="b93161228141614"></a>Description</strong></p>
</td>
</tr>
<tr id="row0312151666"><td class="cellrowborder" valign="top" width="48.120000000000005%"><p id="p1431265763"><a name="p1431265763"></a><a name="p1431265763"></a>gpio</p>
</td>
<td class="cellrowborder" valign="top" width="51.88%"><p id="p83121553613"><a name="p83121553613"></a><a name="p83121553613"></a>GPIO pin number.</p>
</td>
</tr>
<tr id="row11312151619"><td class="cellrowborder" valign="top" width="48.120000000000005%"><p id="p173121451664"><a name="p173121451664"></a><a name="p173121451664"></a>dir</p>
</td>
<td class="cellrowborder" valign="top" width="51.88%"><p id="p153122520615"><a name="p153122520615"></a><a name="p153122520615"></a>Direction to set.</p>
</td>
</tr>
<tr id="row165937126386"><td class="cellrowborder" valign="top" width="48.120000000000005%"><p id="p83111453613"><a name="p83111453613"></a><a name="p83111453613"></a><strong id="b42491732121614"><a name="b42491732121614"></a><a name="b42491732121614"></a>Return Value</strong></p>
</td>
<td class="cellrowborder" valign="top" width="51.88%"><p id="p83111151165"><a name="p83111151165"></a><a name="p83111151165"></a><strong id="b1116336166"><a name="b1116336166"></a><a name="b1116336166"></a>Description</strong></p>
</td>
</tr>
<tr id="row205931212123817"><td class="cellrowborder" valign="top" width="48.120000000000005%"><p id="p18312151463"><a name="p18312151463"></a><a name="p18312151463"></a>0</p>
</td>
<td class="cellrowborder" valign="top" width="51.88%"><p id="p103124517618"><a name="p103124517618"></a><a name="p103124517618"></a>The operation is successful.</p>
</td>
</tr>
<tr id="row75931212153818"><td class="cellrowborder" valign="top" width="48.120000000000005%"><p id="p23121951261"><a name="p23121951261"></a><a name="p23121951261"></a>Negative value</p>
</td>
<td class="cellrowborder" valign="top" width="51.88%"><p id="p153121553610"><a name="p153121553610"></a><a name="p153121553610"></a>The operation failed.</p>
</td>
</tr>
</tbody>
</table>

  • Read or write the level value for a GPIO pin.

    Call GpioRead() to read the level value of a GPIO pin.

    int32_t GpioRead(uint16_t gpio, uint16_t *val);

Table 3 Description of GpioRead

<a name="table20347743174816"></a>
<table><tbody><tr id="row17348144394816"><td class="cellrowborder" valign="top" width="48.120000000000005%"><p id="p19348164313481"><a name="p19348164313481"></a><a name="p19348164313481"></a><strong id="b4862227121610"><a name="b4862227121610"></a><a name="b4862227121610"></a>Parameter</strong></p>
</td>
<td class="cellrowborder" valign="top" width="51.88%"><p id="p134810432488"><a name="p134810432488"></a><a name="p134810432488"></a><strong id="b677332841611"><a name="b677332841611"></a><a name="b677332841611"></a>Description</strong></p>
</td>
</tr>
<tr id="row134874324814"><td class="cellrowborder" valign="top" width="48.120000000000005%"><p id="p183481437485"><a name="p183481437485"></a><a name="p183481437485"></a>gpio</p>
</td>
<td class="cellrowborder" valign="top" width="51.88%"><p id="p43481043194819"><a name="p43481043194819"></a><a name="p43481043194819"></a>GPIO pin number.</p>
</td>
</tr>
<tr id="row20348343144815"><td class="cellrowborder" valign="top" width="48.120000000000005%"><p id="p1534864310480"><a name="p1534864310480"></a><a name="p1534864310480"></a>val</p>
</td>
<td class="cellrowborder" valign="top" width="51.88%"><p id="p13689159154815"><a name="p13689159154815"></a><a name="p13689159154815"></a>Pointer to the level value.</p>
</td>
</tr>
<tr id="row19348043154813"><td class="cellrowborder" valign="top" width="48.120000000000005%"><p id="p1234812431480"><a name="p1234812431480"></a><a name="p1234812431480"></a><strong id="b10599632101619"><a name="b10599632101619"></a><a name="b10599632101619"></a>Return Value</strong></p>
</td>
<td class="cellrowborder" valign="top" width="51.88%"><p id="p434894334814"><a name="p434894334814"></a><a name="p434894334814"></a><strong id="b236513361617"><a name="b236513361617"></a><a name="b236513361617"></a>Description</strong></p>
</td>
</tr>
<tr id="row3348184311486"><td class="cellrowborder" valign="top" width="48.120000000000005%"><p id="p1934854315487"><a name="p1934854315487"></a><a name="p1934854315487"></a>0</p>
</td>
<td class="cellrowborder" valign="top" width="51.88%"><p id="p103481943114814"><a name="p103481943114814"></a><a name="p103481943114814"></a>The operation is successful.</p>
</td>
</tr>
<tr id="row23485436482"><td class="cellrowborder" valign="top" width="48.120000000000005%"><p id="p1134834310486"><a name="p1134834310486"></a><a name="p1134834310486"></a>Negative value</p>
</td>
<td class="cellrowborder" valign="top" width="51.88%"><p id="p93491343144815"><a name="p93491343144815"></a><a name="p93491343144815"></a>The operation failed.</p>
</td>
</tr>
</tbody>
</table>


Call **GpioWrite()** to write the level value for a GPIO pin.

int32\_t GpioWrite\(uint16\_t gpio, uint16\_t val\);

Table 4 Description of GpioWrite

<a name="table1214911207520"></a>
<table><tbody><tr id="row6149720175218"><td class="cellrowborder" valign="top" width="48.120000000000005%"><p id="p18149132005216"><a name="p18149132005216"></a><a name="p18149132005216"></a><strong id="b19864427181615"><a name="b19864427181615"></a><a name="b19864427181615"></a>Parameter</strong></p>
</td>
<td class="cellrowborder" valign="top" width="51.88%"><p id="p16149220145216"><a name="p16149220145216"></a><a name="p16149220145216"></a><strong id="b4774132861616"><a name="b4774132861616"></a><a name="b4774132861616"></a>Description</strong></p>
</td>
</tr>
<tr id="row16149102014526"><td class="cellrowborder" valign="top" width="48.120000000000005%"><p id="p31495206527"><a name="p31495206527"></a><a name="p31495206527"></a>gpio</p>
</td>
<td class="cellrowborder" valign="top" width="51.88%"><p id="p1014972085212"><a name="p1014972085212"></a><a name="p1014972085212"></a>GPIO pin number.</p>
</td>
</tr>
<tr id="row3149112095214"><td class="cellrowborder" valign="top" width="48.120000000000005%"><p id="p1815072011528"><a name="p1815072011528"></a><a name="p1815072011528"></a>val</p>
</td>
<td class="cellrowborder" valign="top" width="51.88%"><p id="p1931618337524"><a name="p1931618337524"></a><a name="p1931618337524"></a>Level value to write.</p>
</td>
</tr>
<tr id="row1115062015220"><td class="cellrowborder" valign="top" width="48.120000000000005%"><p id="p10150172015218"><a name="p10150172015218"></a><a name="p10150172015218"></a><strong id="b760183221611"><a name="b760183221611"></a><a name="b760183221611"></a>Return Value</strong></p>
</td>
<td class="cellrowborder" valign="top" width="51.88%"><p id="p1150192015527"><a name="p1150192015527"></a><a name="p1150192015527"></a><strong id="b14366123310160"><a name="b14366123310160"></a><a name="b14366123310160"></a>Description</strong></p>
</td>
</tr>
<tr id="row111503202526"><td class="cellrowborder" valign="top" width="48.120000000000005%"><p id="p171501320205216"><a name="p171501320205216"></a><a name="p171501320205216"></a>0</p>
</td>
<td class="cellrowborder" valign="top" width="51.88%"><p id="p15150102017522"><a name="p15150102017522"></a><a name="p15150102017522"></a>The operation is successful.</p>
</td>
</tr>
<tr id="row1615002018528"><td class="cellrowborder" valign="top" width="48.120000000000005%"><p id="p15150182045212"><a name="p15150182045212"></a><a name="p15150182045212"></a>Negative value</p>
</td>
<td class="cellrowborder" valign="top" width="51.88%"><p id="p13150320105212"><a name="p13150320105212"></a><a name="p13150320105212"></a>The operation failed.</p>
</td>
</tr>
</tbody>
</table>

Example:

```
int32_t ret;
uint16_t val;
/* Set the output direction for GPIO3. */
ret = GpioSetDir(3, GPIO_DIR_OUT);
if (ret != 0) {
    HDF_LOGE("GpioSerDir: failed, ret %d\n", ret);
    return;
}
/* Write the low level GPIO_VAL_LOW for GPIO3. */
ret = GpioWrite(3, GPIO_VAL_LOW);
if (ret != 0) {
    HDF_LOGE("GpioWrite: failed, ret %d\n", ret);
    return;
}
/* Set the input direction for GPIO6. */
ret = GpioSetDir(6, GPIO_DIR_IN);
if (ret != 0) {
    HDF_LOGE("GpioSetDir: failed, ret %d\n", ret);
    return;
}
/* Read the level value of GPIO6. */
ret = GpioRead(6, &val);
```

  • Set the ISR function for a GPIO pin.

    Call GpioSetIrq() to set the ISR function for a GPIO pin.

    int32_t GpioSetIrq(uint16_t gpio, uint16_t mode, GpioIrqFunc func, void *arg);

Table 5 Description of GpioSetIrq

<a name="table16804111812466"></a>
<table><tbody><tr id="row880401834615"><td class="cellrowborder" valign="top" width="48.54%"><p id="p380491819469"><a name="p380491819469"></a><a name="p380491819469"></a><strong id="b0865192761614"><a name="b0865192761614"></a><a name="b0865192761614"></a>Parameter</strong></p>
</td>
<td class="cellrowborder" valign="top" width="51.459999999999994%"><p id="p48041318114619"><a name="p48041318114619"></a><a name="p48041318114619"></a><strong id="b1477520282162"><a name="b1477520282162"></a><a name="b1477520282162"></a>Description</strong></p>
</td>
</tr>
<tr id="row19805181812465"><td class="cellrowborder" valign="top" width="48.54%"><p id="p11805101874611"><a name="p11805101874611"></a><a name="p11805101874611"></a>gpio</p>
</td>
<td class="cellrowborder" valign="top" width="51.459999999999994%"><p id="p6805181818461"><a name="p6805181818461"></a><a name="p6805181818461"></a>GPIO pin number.</p>
</td>
</tr>
<tr id="row1080541817469"><td class="cellrowborder" valign="top" width="48.54%"><p id="p580541864611"><a name="p580541864611"></a><a name="p580541864611"></a>mode</p>
</td>
<td class="cellrowborder" valign="top" width="51.459999999999994%"><p id="p380511180463"><a name="p380511180463"></a><a name="p380511180463"></a>Interrupt trigger mode.</p>
</td>
</tr>
<tr id="row83541951134617"><td class="cellrowborder" valign="top" width="48.54%"><p id="p5355351104610"><a name="p5355351104610"></a><a name="p5355351104610"></a>func</p>
</td>
<td class="cellrowborder" valign="top" width="51.459999999999994%"><p id="p11355551174619"><a name="p11355551174619"></a><a name="p11355551174619"></a>ISR function to set.</p>
</td>
</tr>
<tr id="row6593577469"><td class="cellrowborder" valign="top" width="48.54%"><p id="p165985724619"><a name="p165985724619"></a><a name="p165985724619"></a>arg</p>
</td>
<td class="cellrowborder" valign="top" width="51.459999999999994%"><p id="p559185784619"><a name="p559185784619"></a><a name="p559185784619"></a>Pointer to the parameters passed to the ISR function.</p>
</td>
</tr>
<tr id="row16299193210587"><td class="cellrowborder" valign="top" width="48.54%"><p id="p7804101884614"><a name="p7804101884614"></a><a name="p7804101884614"></a><strong id="b126021932131615"><a name="b126021932131615"></a><a name="b126021932131615"></a>Return Value</strong></p>
</td>
<td class="cellrowborder" valign="top" width="51.459999999999994%"><p id="p680441818466"><a name="p680441818466"></a><a name="p680441818466"></a><strong id="b836716339162"><a name="b836716339162"></a><a name="b836716339162"></a>Description</strong></p>
</td>
</tr>
<tr id="row12299632125817"><td class="cellrowborder" valign="top" width="48.54%"><p id="p1180511189465"><a name="p1180511189465"></a><a name="p1180511189465"></a>0</p>
</td>
<td class="cellrowborder" valign="top" width="51.459999999999994%"><p id="p180521812465"><a name="p180521812465"></a><a name="p180521812465"></a>The operation is successful.</p>
</td>
</tr>
<tr id="row029833235815"><td class="cellrowborder" valign="top" width="48.54%"><p id="p1080591814468"><a name="p1080591814468"></a><a name="p1080591814468"></a>Negative value</p>
</td>
<td class="cellrowborder" valign="top" width="51.459999999999994%"><p id="p18805141884611"><a name="p18805141884611"></a><a name="p18805141884611"></a>The operation failed.</p>
</td>
</tr>
</tbody>
</table>

>![](../public_sys-resources/icon-caution.gif) **CAUTION**<br/> 
>Only one ISR function can be set for a GPIO pin at a time. If **GpioSetIrq** is called repeatedly, the previous IRS function will be replaced.

If the ISR function is no longer required, call **GpioUnSetIrq()** to cancel the setting.

int32\_t GpioUnSetIrq\(uint16\_t gpio\);

Table 6 Description of GpioUnSetIrq

<a name="table1157224664316"></a>
<table><tbody><tr id="row175721546174317"><td class="cellrowborder" valign="top" width="48.54%"><p id="p16572144694311"><a name="p16572144694311"></a><a name="p16572144694311"></a><strong id="b16866132761617"><a name="b16866132761617"></a><a name="b16866132761617"></a>Parameter</strong></p>
</td>
<td class="cellrowborder" valign="top" width="51.459999999999994%"><p id="p185721461435"><a name="p185721461435"></a><a name="p185721461435"></a><strong id="b1377613282167"><a name="b1377613282167"></a><a name="b1377613282167"></a>Description</strong></p>
</td>
</tr>
<tr id="row1257284664318"><td class="cellrowborder" valign="top" width="48.54%"><p id="p95721946144317"><a name="p95721946144317"></a><a name="p95721946144317"></a>gpio</p>
</td>
<td class="cellrowborder" valign="top" width="51.459999999999994%"><p id="p1557313464439"><a name="p1557313464439"></a><a name="p1557313464439"></a>GPIO pin number.</p>
</td>
</tr>
<tr id="row1857324618435"><td class="cellrowborder" valign="top" width="48.54%"><p id="p1257344624314"><a name="p1257344624314"></a><a name="p1257344624314"></a><strong id="b1160353241610"><a name="b1160353241610"></a><a name="b1160353241610"></a>Return Value</strong></p>
</td>
<td class="cellrowborder" valign="top" width="51.459999999999994%"><p id="p457384611439"><a name="p457384611439"></a><a name="p457384611439"></a><strong id="b133681833151617"><a name="b133681833151617"></a><a name="b133681833151617"></a>Description</strong></p>
</td>
</tr>
<tr id="row357318466439"><td class="cellrowborder" valign="top" width="48.54%"><p id="p1573164616438"><a name="p1573164616438"></a><a name="p1573164616438"></a>0</p>
</td>
<td class="cellrowborder" valign="top" width="51.459999999999994%"><p id="p857384614319"><a name="p857384614319"></a><a name="p857384614319"></a>The operation is successful.</p>
</td>
</tr>
<tr id="row18573124610433"><td class="cellrowborder" valign="top" width="48.54%"><p id="p165731146134311"><a name="p165731146134311"></a><a name="p165731146134311"></a>Negative value</p>
</td>
<td class="cellrowborder" valign="top" width="51.459999999999994%"><p id="p6573164613437"><a name="p6573164613437"></a><a name="p6573164613437"></a>The operation failed.</p>
</td>
</tr>
</tbody>
</table>

After the ISR function is set, call **GpioEnableIrq()** to enable interrupts.

int32\_t GpioEnableIrq\(uint16\_t gpio\);

Table 7 Description of GpioEnableIrq

<a name="table26659291568"></a>
<table><tbody><tr id="row866632919566"><td class="cellrowborder" valign="top" width="50%"><p id="p066642985615"><a name="p066642985615"></a><a name="p066642985615"></a><strong id="b108661927171614"><a name="b108661927171614"></a><a name="b108661927171614"></a>Parameter</strong></p>
</td>
<td class="cellrowborder" valign="top" width="50%"><p id="p566613293568"><a name="p566613293568"></a><a name="p566613293568"></a><strong id="b10777228121617"><a name="b10777228121617"></a><a name="b10777228121617"></a>Description</strong></p>
</td>
</tr>
<tr id="row19666029165620"><td class="cellrowborder" valign="top" width="50%"><p id="p16660295566"><a name="p16660295566"></a><a name="p16660295566"></a>gpio</p>
</td>
<td class="cellrowborder" valign="top" width="50%"><p id="p1566632916566"><a name="p1566632916566"></a><a name="p1566632916566"></a>GPIO pin number.</p>
</td>
</tr>
<tr id="row84182176010"><td class="cellrowborder" valign="top" width="50%"><p id="p1566652915566"><a name="p1566652915566"></a><a name="p1566652915566"></a><strong id="b160443201612"><a name="b160443201612"></a><a name="b160443201612"></a>Return Value</strong></p>
</td>
<td class="cellrowborder" valign="top" width="50%"><p id="p966642917562"><a name="p966642917562"></a><a name="p966642917562"></a><strong id="b12369193319162"><a name="b12369193319162"></a><a name="b12369193319162"></a>Description</strong></p>
</td>
</tr>
<tr id="row154188171403"><td class="cellrowborder" valign="top" width="50%"><p id="p1866610292563"><a name="p1866610292563"></a><a name="p1866610292563"></a>0</p>
</td>
<td class="cellrowborder" valign="top" width="50%"><p id="p13666182975613"><a name="p13666182975613"></a><a name="p13666182975613"></a>The operation is successful.</p>
</td>
</tr>
<tr id="row1041891720012"><td class="cellrowborder" valign="top" width="50%"><p id="p766642911562"><a name="p766642911562"></a><a name="p766642911562"></a>Negative value</p>
</td>
<td class="cellrowborder" valign="top" width="50%"><p id="p1566652995613"><a name="p1566652995613"></a><a name="p1566652995613"></a>The operation failed.</p>
</td>
</tr>
</tbody>
</table>

>![](../public_sys-resources/icon-caution.gif) **CAUTION**<br/> 
>The configured ISR function can be responded only after the GPIO interrupt is enabled.

Call **GpioDisableIrq()** to disable interrupts.

int32\_t GpioDisableIrq\(uint16\_t gpio\);

Table 8 Description of GpioDisableIrq

<a name="table186682041918"></a>
<table><tbody><tr id="row186684413116"><td class="cellrowborder" valign="top" width="50%"><p id="p866844916"><a name="p866844916"></a><a name="p866844916"></a><strong id="b88678273169"><a name="b88678273169"></a><a name="b88678273169"></a>Parameter</strong></p>
</td>
<td class="cellrowborder" valign="top" width="50%"><p id="p46681413119"><a name="p46681413119"></a><a name="p46681413119"></a><strong id="b2077772812169"><a name="b2077772812169"></a><a name="b2077772812169"></a>Description</strong></p>
</td>
</tr>
<tr id="row4668243113"><td class="cellrowborder" valign="top" width="50%"><p id="p46681141919"><a name="p46681141919"></a><a name="p46681141919"></a>gpio</p>
</td>
<td class="cellrowborder" valign="top" width="50%"><p id="p136681241311"><a name="p136681241311"></a><a name="p136681241311"></a>GPIO pin number.</p>
</td>
</tr>
<tr id="row066884412"><td class="cellrowborder" valign="top" width="50%"><p id="p566824015"><a name="p566824015"></a><a name="p566824015"></a><strong id="b16605123251612"><a name="b16605123251612"></a><a name="b16605123251612"></a>Return Value</strong></p>
</td>
<td class="cellrowborder" valign="top" width="50%"><p id="p1766974515"><a name="p1766974515"></a><a name="p1766974515"></a><strong id="b1237063341617"><a name="b1237063341617"></a><a name="b1237063341617"></a>Description</strong></p>
</td>
</tr>
<tr id="row156694410112"><td class="cellrowborder" valign="top" width="50%"><p id="p14669141214"><a name="p14669141214"></a><a name="p14669141214"></a>0</p>
</td>
<td class="cellrowborder" valign="top" width="50%"><p id="p1266934818"><a name="p1266934818"></a><a name="p1266934818"></a>The operation is successful.</p>
</td>
</tr>
<tr id="row176691543117"><td class="cellrowborder" valign="top" width="50%"><p id="p7669941716"><a name="p7669941716"></a><a name="p7669941716"></a>Negative value</p>
</td>
<td class="cellrowborder" valign="top" width="50%"><p id="p4669164219"><a name="p4669164219"></a><a name="p4669164219"></a>The operation failed.</p>
</td>
</tr>
</tbody>
</table>

Example:

```
/* ISR function */
*/
int32_t MyCallBackFunc(uint16_t gpio, void *data)
{
    HDF_LOGI("%s: gpio:%u interrupt service in! data=%p\n", __func__, gpio, data);
    return 0;
}

int32_t ret;
/* Set the ISR function to MyCallBackFunc, the parameter to NULL, and the interrupt trigger mode to rising edge. */
ret = GpioSetIrq(3, OSAL_IRQF_TRIGGER_RISING, MyCallBackFunc, NULL);
if (ret != 0) {
    HDF_LOGE("GpioSetIrq: failed, ret %d\n", ret);
    return;
}

/* Enable an interrupt for GPIO3. */
ret = GpioEnableIrq(3);
if (ret != 0) {
    HDF_LOGE("GpioEnableIrq: failed, ret %d\n", ret);
    return;
}

/* Disable the interrupt for GPIO3. */
ret = GpioDisableIrq(3);
if (ret != 0) {
    HDF_LOGE("GpioDisableIrq: failed, ret %d\n", ret);
    return;
}

/* Cancel the ISR function for GPIO3. */
ret = GpioUnSetIrq(3);
if (ret != 0) {
    HDF_LOGE("GpioUnSetIrq: failed, ret %d\n", ret);
    return;
}
```

Usage Example

The procedure is as follows:

  1. Select an idle GPIO pin.

    This example uses pin GPIO10_3 on a Hi3516D V300 development board as an example. The pin number is 83. You can select an idle GPIO pin as required.

  2. Set the ISR function for the pin, with the trigger mode of rising edge and failing edge.

  3. Write high and low levels to the pin alternately, and observe the execution of the ISR function.

#include "gpio_if.h"
#include "hdf_log.h"
#include "osal_irq.h"
#include "osal_time.h"

static uint32_t g_irqCnt;

/* ISR function */
static int32_t TestCaseGpioIrqHandler(uint16_t gpio, void *data)
{
    HDF_LOGE("%s: irq triggered! on gpio:%u, data=%p", __func__, gpio, data);
    g_irqCnt++; /* If the ISR function is triggered, the number of global interrupts is incremented by 1. */
    return GpioDisableIrq(gpio);
}

/* Test case function */
static int32_t TestCaseGpioIrqEdge(void)
{
    int32_t ret;
    uint16_t valRead;
    uint16_t mode;
    uint16_t gpio = 83; /* Number of the GPIO pin to test */
    uint32_t timeout;

    /* Set the output direction for the pin. */
    ret = GpioSetDir(gpio, GPIO_DIR_OUT);
    if (ret != HDF_SUCCESS) {
        HDF_LOGE("%s: set dir fail! ret:%d\n", __func__, ret);
        return ret;
    }

    /* Disable the interrupt of the pin. */
    ret = GpioDisableIrq(gpio);
    if (ret != HDF_SUCCESS) {
        HDF_LOGE("%s: disable irq fail! ret:%d\n", __func__, ret);
        return ret;
    }

    /* Set the ISR function for the pin. The trigger mode is both rising edge and falling edge. */
    mode = OSAL_IRQF_TRIGGER_RISING | OSAL_IRQF_TRIGGER_FALLING;
    HDF_LOGE("%s: mode:%0x\n", __func__, mode);
    ret = GpioSetIrq(gpio, mode, TestCaseGpioIrqHandler, NULL);
    if (ret != HDF_SUCCESS) {
        HDF_LOGE("%s: set irq fail! ret:%d\n", __func__, ret);
        return ret;
    }

    /* Enable the interrupt for this pin. */
    ret = GpioEnableIrq(gpio);
    if (ret != HDF_SUCCESS) {
        HDF_LOGE("%s: enable irq fail! ret:%d\n", __func__, ret);
        (void)GpioUnSetIrq(gpio);
        return ret;
    }

    g_irqCnt = 0; /* Reset the global counter. */
    timeout = 0;  /* Reset the waiting time. */
    /* Wait for the ISR function of this pin to trigger. The timeout duration is 1000 ms. */
    while (g_irqCnt <= 0 && timeout < 1000) {
        (void)GpioRead(gpio, &valRead);
        (void)GpioWrite(gpio, (valRead == GPIO_VAL_LOW) ? GPIO_VAL_HIGH : GPIO_VAL_LOW);
        HDF_LOGE("%s: wait irq timeout:%u\n", __func__, timeout);
        OsalMDelay(200); /* wait for irq trigger */
        timeout += 200;
    }
    (void)GpioUnSetIrq(gpio);
    return (g_irqCnt > 0) ? HDF_SUCCESS : HDF_FAILURE;
}