Maxim Integrated 73M1822/73M1922 Control Module - Manual (Page 75)

UG_1x22_053 73M1822/73M1922 Control Module User Guide
Rev. 1.0 75
7.12.7 M1X22_GPIO_INTR_POLARITY
Description
GPIO Interrupt signal transition edge selection. The defines the interrupt source as being either on a
rising or a falling edge of the corresponding GPIO pin. If configured as M1X22_GPIO_POL_RISING a
rising edge will trigger an interrupt from the corresponding GPIO pin. If configured as
M1X22_GPIO_POL_FALLING
a falling edge will trigger an interrupt from the corresponding GPIO pin.
Prototype
typedef enum {
M1X22_GPIO_POL_RISING = 0, /* Sig transition edge polarity - RISING */
M1X22_GPIO_POL_FALLING = 1 /* Sig transition edge polarity - FALLING */
}
M1X22_GPIO_INTR_POLARITY;
Parameters
Name Value Description
M1X22_GPIO_POL_RISING 0 Interrupt edge selection – RISING.
M1X22_GPIO_POL_FALLING 1 Interrupt edge selection – FALLING.
7.12.8 M1X22_GPIO_CONFIG_t
Description
This structure is used by the M1X22_GPIO_CONFIG IOCTLs to read or write GPIO configuration. The
first field in the config structure is the command action field – GET or SET. For the GET command the
“direction” and “polarity” fields are returned if successful.
Prototype
typedef struct gpio_config
{
M1X22_GPIO_CONFIG_COMMAND command; /* command */
M1X22_GPIO_NUMBER gpio; /* GPIO number */
M1X22_GPIO_SIGNAL_DIR direction; /* signal direction */
M1X22_GPIO_INTR_POLARITY polarity; /* intr edge selection */
}
M1X22_GPIO_CONFIG_t;
Parameters
Data Type Name Description
M1X22_GPIO_CONFIG_COMMAND command GET or SET GPIO config command.
M1X22_GPIO_NUMBER gpio GPIO number.
M1X22_GPIO_DIRECTION direction GPIO pin direction – input/output.
M1X22_GPIO_INTR_POLARITY polarity Interrupt on signal transition edge polarity.