PROTOCOLS
Gpio
Defined in fuchsia.hardware.gpio/gpio.fidl
Common error codes:
ZX_ERR_NOT_SUPPORTED: The requested operation is not supported by this controller.
ConfigureInterrupt
Configures the polarity of an interrupt and whether it is edge- or level-triggered. Only the
client with the interrupt can call ConfigureInterrupt(), unless no client has an
interrupt.
Returns ZX_ERR_INVALID_ARGS if no fields are set in config, or ZX_ERR_ACCESS_DENIED if
another client has the interrupt.
Request
| Name | Type |
|---|---|
config |
InterruptConfiguration
|
Response
| Name | Type |
|---|---|
payload |
Gpio_ConfigureInterrupt_Result
|
GetInterrupt
Gets an interrupt object pertaining to a particular GPIO pin. Only one interrupt may
be outstanding per pin, and it must be released by calling ReleaseInterrupt() before the
next call to GetInterrupt() will succeed.
Some GPIO controllers have a single interrupt that is demultiplexed across all pins. In this
case, the server masks the interrupt corresponding to this pin before triggering
interrupt, then waits for the client to assert SIGNAL_ACK_INTERRUPT on interrupt
before unmasking. Once the client has asserted the signal, the server is responsible for
clearing it.
Returns ZX_ERR_ALREADY_EXISTS if GetInterrupt() has already been called without a
subsequent call to ReleaseInterrupt(), ZX_ERR_INVALID_ARGS if options is invalid, or
ZX_ERR_ACCESS_DENIED if another client has the interrupt.
Request
| Name | Type |
|---|---|
options |
InterruptOptions
|
Response
| Name | Type |
|---|---|
payload |
Gpio_GetInterrupt_Result
|
Read
Reads the current value of a GPIO, returning true for a high voltage and false for a
low voltage.
Request
<EMPTY>
Response
| Name | Type |
|---|---|
payload |
Gpio_Read_Result
|
ReleaseInterrupt
Releases the interrupt, allowing GetInterrupt() to be called again or by another
client. A client's interrupt is automatically released when it disconnects from the
server.
Returns ZX_ERR_NOT_FOUND if the interrupt has already been released, or if
GetInterrupt() has not been called. Returns ZX_ERR_ACCESS_DENIED if another client has
the interrupt.
Request
<EMPTY>
Response
| Name | Type |
|---|---|
payload |
Gpio_ReleaseInterrupt_Result
|
SetBufferMode
Configures the output buffer as per mode.
Request
| Name | Type |
|---|---|
mode |
BufferMode
|
Response
| Name | Type |
|---|---|
payload |
Gpio_SetBufferMode_Result
|
STRUCTS
Gpio_ConfigureInterrupt_Response
Defined in fuchsia.hardware.gpio/gpio.fidl
<EMPTY>
Gpio_GetInterrupt_Response resource
Defined in fuchsia.hardware.gpio/gpio.fidl
| Field | Type | Description | Default |
|---|---|---|---|
interrupt |
handle<interrupt>
|
No default |
Gpio_Read_Response
Defined in fuchsia.hardware.gpio/gpio.fidl
| Field | Type | Description | Default |
|---|---|---|---|
value |
bool
|
No default |
Gpio_ReleaseInterrupt_Response
Defined in fuchsia.hardware.gpio/gpio.fidl
<EMPTY>
Gpio_SetBufferMode_Response
Defined in fuchsia.hardware.gpio/gpio.fidl
<EMPTY>
ENUMS
BufferMode strict
Type: uint32
Defined in fuchsia.hardware.gpio/gpio.fidl
Whether to drive the GPIO to a high or low voltage, or disable the output buffer.
| Name | Value | Description |
|---|---|---|
INPUT |
0 |
|
OUTPUT_LOW |
1 |
|
OUTPUT_HIGH |
2 |
InterruptMode strict
Type: uint32
Defined in fuchsia.hardware.gpio/gpio.fidl
| Name | Value | Description |
|---|---|---|
EDGE_LOW |
0 |
|
EDGE_HIGH |
1 |
|
EDGE_BOTH |
2 |
|
LEVEL_LOW |
3 |
|
LEVEL_HIGH |
4 |
TABLES
InterruptConfiguration
Defined in fuchsia.hardware.gpio/gpio.fidl
| Ordinal | Field | Type | Description |
|---|---|---|---|
1 |
mode |
InterruptMode
|
UNIONS
Gpio_ConfigureInterrupt_Result strict
Defined in fuchsia.hardware.gpio/gpio.fidl
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 |
response |
Gpio_ConfigureInterrupt_Response
|
|
2 |
err |
zx/Status
|
Gpio_GetInterrupt_Result strict resource
Defined in fuchsia.hardware.gpio/gpio.fidl
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 |
response |
Gpio_GetInterrupt_Response
|
|
2 |
err |
zx/Status
|
Gpio_Read_Result strict
Defined in fuchsia.hardware.gpio/gpio.fidl
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 |
response |
Gpio_Read_Response
|
|
2 |
err |
zx/Status
|
Gpio_ReleaseInterrupt_Result strict
Defined in fuchsia.hardware.gpio/gpio.fidl
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 |
response |
Gpio_ReleaseInterrupt_Response
|
|
2 |
err |
zx/Status
|
Gpio_SetBufferMode_Result strict
Defined in fuchsia.hardware.gpio/gpio.fidl
| Ordinal | Variant | Type | Description |
|---|---|---|---|
1 |
response |
Gpio_SetBufferMode_Response
|
|
2 |
err |
zx/Status
|
BITS
InterruptOptions flexible
Type: uint32
Defined in fuchsia.hardware.gpio/gpio.fidl
| Name | Value | Description |
|---|---|---|
WAKEABLE |
1 | The interrupt wakes up the system if the system is suspended. Must not be set if system suspend / resume is disabled. Added: 27
|
TIMESTAMP_MONO |
2 | The interrupt returns a monotonic timestamp from synchronous and asynchronous waits. Otherwise, it returns a boot timestamp from waits. Added: NEXT
|
CONSTANTS
| Name | Value | Type | Description |
|---|---|---|---|
| SIGNAL_ACK_INTERRUPT |
16777216
|
uint32 |
Added: 27
|
SERVICES
Service
Defined in fuchsia.hardware.gpio/gpio.fidl
| Name | Type | Transport |
|---|---|---|
| device |
fuchsia.hardware.gpio/Gpio
|
Channel |