Module gpio 

The C ABI for on-board bus addressing and pin logic.

These functions wrap [pamoja_gpio] for callers that reach the SDK through the flat C boundary: I2C addressing per NXP UM10204, the four SPI clock modes, and the pin model that maps a logical “asserted” onto a physical level.

Nothing here allocates or holds state, so nothing here is a handle. An I2C address is two scalars and crosses by value as PamojaI2cAddress; the rest are enumerations and small pure functions over them.

Structs

PamojaI2cAddress

A validated I2C device address.

Enums

PamojaI2cDirection

Which direction an I2C transfer runs, as the read/write bit encodes it.

PamojaPinEdge

The signal transition that triggers a pin interrupt.

PamojaPinLevel

The physical voltage level on a pin.

PamojaPinPolarity

Whether a signal is asserted by a high or a low physical level.

Constants

PAMOJA_I2C_FRAME_MAX

The largest I2C address frame, in bytes: the two a 10-bit address needs.

PAMOJA_I2C_RESERVED_BELOW

The first 7-bit address above the reserved block at the bottom of the range.

PAMOJA_I2C_RESERVED_FROM

The lowest 7-bit address the I2C specification keeps for itself.

Functions

pamoja_i2c_address_frame^⚠

Writes the address bytes a controller puts on the bus for a transfer.

pamoja_i2c_address_frame_len

Returns how many bytes an address frame occupies.

pamoja_i2c_address_is_general_call

Reports whether an address is the general call address 0x00.

pamoja_i2c_address_is_reserved

Reports whether a 7-bit address falls in a range the I2C specification reserves.

pamoja_i2c_address_seven_bit^⚠

Validates a 7-bit I2C address.

pamoja_i2c_address_ten_bit^⚠

Validates a 10-bit I2C address.

pamoja_pin_edge_triggered_by

Reports whether a change from one level to another fires an interrupt trigger.

pamoja_pin_level_from_bool

Returns the level a boolean names.

pamoja_pin_level_inverted

Returns the opposite level.

pamoja_pin_polarity_is_asserted

Reports whether a physical level means the signal is asserted.

pamoja_pin_polarity_level

Returns the physical level that represents a logical state under a polarity.

pamoja_spi_mode_cpol_cpha^⚠

Returns the (CPOL, CPHA) pair an SPI mode number names.

pamoja_spi_mode_from_cpol_cpha

Returns the SPI mode number a (CPOL, CPHA) pair names.