atmega328p::twi Namespace Reference

Two-wire interface definitions. More...

Enumerations
enum class	Prescaler : uint8_t { Divide1 = 1 , Divide4 = 4 , Divide16 = 16 , Divide64 = 64 }
	TWI clock prescaler values. More...
enum class	StatusCode : uint8_t {   BusError = 0x00 , StartTransmitted = 0x08 , RepeatedStartTransmitted = 0x10 , AddressWriteAck = 0x18 ,   AddressWriteNack = 0x20 , DataWriteAck = 0x28 , DataWriteNack = 0x30 , ArbitrationLost = 0x38 ,   AddressReadAck = 0x40 , AddressReadNack = 0x48 , DataReadAck = 0x50 , DataReadNack = 0x58 ,   OwnAddressWriteAck = 0x60 , ArbitrationLostOwnAddressWriteAck = 0x68 , GeneralCallAck = 0x70 , ArbitrationLostGeneralCallAck = 0x78 ,   OwnAddressDataAck = 0x80 , OwnAddressDataNack = 0x88 , GeneralCallDataAck = 0x90 , GeneralCallDataNack = 0x98 ,   StopOrRepeatedStartReceived = 0xA0 , OwnAddressReadAck = 0xA8 , ArbitrationLostOwnAddressReadAck = 0xB0 , OwnAddressReadDataAck = 0xB8 ,   OwnAddressReadDataNack = 0xC0 , LastDataByteAck = 0xC8 , NoRelevantStateInformation = 0xF8 }
	TWI bus status codes. More...
enum	: uint8_t {   module_count = 1U , address_bits = 7U , address_count = 128U , prescaler_count = 4U ,   sda_pin_value = 0x14U , scl_pin_value = 0x15U , supports_master = 1 , supports_slave = 1 ,   supports_multi_master_arbitration = 1 , supports_general_call = 1 , cpu_clock_must_exceed_max_of_16x_scl_and_250khz = 1 }
enum	: uint16_t { min_cpu_clocks_per_scl_in_slave_mode = 16U }
	TWI timing limits. More...
enum	: uint32_t { min_cpu_clock_hz = 250000UL , standard_mode_max_hz = 100000UL , fast_mode_max_hz = 400000UL }

Detailed Description

Two-wire interface definitions.

Enumeration Type Documentation

anonymous enum

anonymous enum : uint32_t

Enumerator
min_cpu_clock_hz	Min CPU clock (Hz).
standard_mode_max_hz	Standard mode max (Hz).
fast_mode_max_hz	Fast mode max (Hz).

anonymous enum

anonymous enum : uint8_t

Enumerator
module_count	Number of module.
address_bits	Address width (bits).
address_count	Number of address.
prescaler_count	Number of prescaler.
sda_pin_value	SDA logical pin encoding.
scl_pin_value	SCL logical pin encoding.
supports_master	Master supported.
supports_slave	Slave supported.
supports_multi_master_arbitration	Multi master arbitration supported.
supports_general_call	General call supported.
cpu_clock_must_exceed_max_of_16x_scl_and_250khz	CPU clock must exceed max of 16x SCL and 250khz.

anonymous enum

anonymous enum : uint16_t

TWI timing limits.

Enumerator
min_cpu_clocks_per_scl_in_slave_mode	Min CPU clocks per SCL in slave mode.

Prescaler

enum class atmega328p::twi::Prescaler : uint8_t

strong

TWI clock prescaler values.

Enumerator
Divide1	1 - TWI prescaler factor 1.
Divide4	4 - TWI prescaler factor 4.
Divide16	16 - TWI prescaler factor 16.
Divide64	64 - TWI prescaler factor 64.

StatusCode

enum class atmega328p::twi::StatusCode : uint8_t

strong

TWI bus status codes.

Enumerator
BusError	0x00 - Illegal START or STOP condition.
StartTransmitted	0x08 - START sent.
RepeatedStartTransmitted	0x10 - Repeated START sent.
AddressWriteAck	0x18 - SLA+W sent, ACK received.
AddressWriteNack	0x20 - SLA+W sent, NACK received.
DataWriteAck	0x28 - Data sent, ACK received.
DataWriteNack	0x30 - Data sent, NACK received.
ArbitrationLost	0x38 - Bus arbitration lost.
AddressReadAck	0x40 - SLA+R sent, ACK received.
AddressReadNack	0x48 - SLA+R sent, NACK received.
DataReadAck	0x50 - Data received, ACK returned.
DataReadNack	0x58 - Data received, NACK returned.
OwnAddressWriteAck	0x60 - Own SLA+W received; ACK sent.
ArbitrationLostOwnAddressWriteAck	0x68 - Arbitration lost; own SLA+W received.
GeneralCallAck	0x70 - General call received; ACK sent.
ArbitrationLostGeneralCallAck	0x78 - Arbitration lost; general call received.
OwnAddressDataAck	0x80 - Data received after own SLA+W; ACK sent.
OwnAddressDataNack	0x88 - Data received after own SLA+W; NACK sent.
GeneralCallDataAck	0x90 - General-call data received; ACK sent.
GeneralCallDataNack	0x98 - General-call data received; NACK sent.
StopOrRepeatedStartReceived	0xA0 - STOP or repeated START received.
OwnAddressReadAck	0xA8 - Own SLA+R received; ACK sent.
ArbitrationLostOwnAddressReadAck	0xB0 - Arbitration lost; own SLA+R received.
OwnAddressReadDataAck	0xB8 - Data transmitted; ACK received.
OwnAddressReadDataNack	0xC0 - Data transmitted; NACK received.
LastDataByteAck	0xC8 - Final data byte sent; ACK received.
NoRelevantStateInformation	0xF8 - No relevant TWI state.