TWIM HAL¶
-
group
nrf_twim_hal
Hardware access layer for managing the TWIM peripheral.
Defines
-
NRF_TWIM_HAS_1000_KHZ_FREQ
¶ Symbol indicating whether 1000 kHz clock frequency is available.
Enums
-
enum
nrf_twim_task_t
¶ TWIM tasks.
Values:
-
enumerator
NRF_TWIM_TASK_STARTRX
¶ Start TWI receive sequence.
-
enumerator
NRF_TWIM_TASK_STARTTX
¶ Start TWI transmit sequence.
-
enumerator
NRF_TWIM_TASK_STOP
¶ Stop TWI transaction.
-
enumerator
NRF_TWIM_TASK_SUSPEND
¶ Suspend TWI transaction.
-
enumerator
NRF_TWIM_TASK_RESUME
¶ Resume TWI transaction.
-
enumerator
-
enum
nrf_twim_event_t
¶ TWIM events.
Values:
-
enumerator
NRF_TWIM_EVENT_STOPPED
¶ TWI stopped.
-
enumerator
NRF_TWIM_EVENT_ERROR
¶ TWI error.
-
enumerator
NRF_TWIM_EVENT_SUSPENDED
¶ TWI suspended.
-
enumerator
NRF_TWIM_EVENT_RXSTARTED
¶ Receive sequence started.
-
enumerator
NRF_TWIM_EVENT_TXSTARTED
¶ Transmit sequence started.
-
enumerator
NRF_TWIM_EVENT_LASTRX
¶ Byte boundary, starting to receive the last byte.
-
enumerator
NRF_TWIM_EVENT_LASTTX
¶ Byte boundary, starting to transmit the last byte.
-
enumerator
-
enum
nrf_twim_short_mask_t
¶ TWIM shortcuts.
Values:
-
enumerator
NRF_TWIM_SHORT_LASTTX_STARTRX_MASK
¶ Shortcut between LASTTX event and STARTRX task.
-
enumerator
NRF_TWIM_SHORT_LASTTX_SUSPEND_MASK
¶ Shortcut between LASTTX event and SUSPEND task.
-
enumerator
NRF_TWIM_SHORT_LASTTX_STOP_MASK
¶ Shortcut between LASTTX event and STOP task.
-
enumerator
NRF_TWIM_SHORT_LASTRX_STARTTX_MASK
¶ Shortcut between LASTRX event and STARTTX task.
-
enumerator
NRF_TWIM_SHORT_LASTRX_STOP_MASK
¶ Shortcut between LASTRX event and STOP task.
-
enumerator
NRF_TWIM_ALL_SHORTS_MASK
¶ All TWIM shortcuts.
-
enumerator
-
enum
nrf_twim_int_mask_t
¶ TWIM interrupts.
Values:
-
enumerator
NRF_TWIM_INT_STOPPED_MASK
¶ Interrupt on STOPPED event.
-
enumerator
NRF_TWIM_INT_ERROR_MASK
¶ Interrupt on ERROR event.
-
enumerator
NRF_TWIM_INT_SUSPENDED_MASK
¶ Interrupt on SUSPENDED event.
-
enumerator
NRF_TWIM_INT_RXSTARTED_MASK
¶ Interrupt on RXSTARTED event.
-
enumerator
NRF_TWIM_INT_TXSTARTED_MASK
¶ Interrupt on TXSTARTED event.
-
enumerator
NRF_TWIM_INT_LASTRX_MASK
¶ Interrupt on LASTRX event.
-
enumerator
NRF_TWIM_INT_LASTTX_MASK
¶ Interrupt on LASTTX event.
-
enumerator
NRF_TWIM_ALL_INTS_MASK
¶ All TWIM interrupts.
-
enumerator
-
enum
nrf_twim_frequency_t
¶ TWIM master clock frequency.
Values:
-
enumerator
NRF_TWIM_FREQ_100K
¶ 100 kbps.
-
enumerator
NRF_TWIM_FREQ_250K
¶ 250 kbps.
-
enumerator
NRF_TWIM_FREQ_400K
¶ 400 kbps.
-
enumerator
NRF_TWIM_FREQ_1000K
¶ 1000 kbps.
-
enumerator
-
enum
nrf_twim_error_t
¶ TWIM error source.
Values:
-
enumerator
NRF_TWIM_ERROR_ADDRESS_NACK
¶ NACK received after sending the address.
-
enumerator
NRF_TWIM_ERROR_DATA_NACK
¶ NACK received after sending a data byte.
-
enumerator
NRF_TWIM_ERROR_OVERRUN
¶ Overrun error.
A new byte was received before the previous byte was handled by peripheral. (previous data is lost).
-
enumerator
Functions
-
NRF_STATIC_INLINE void
nrf_twim_task_trigger
(NRF_TWIM_Type *p_reg, nrf_twim_task_t task)¶ Function for activating the specified TWIM task.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
task – [in] Task to be activated.
-
NRF_STATIC_INLINE uint32_t
nrf_twim_task_address_get
(NRF_TWIM_Type const *p_reg, nrf_twim_task_t task)¶ Function for getting the address of the specified TWIM task register.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
task – [in] The specified task.
- Returns
Address of the specified task register.
-
NRF_STATIC_INLINE void
nrf_twim_event_clear
(NRF_TWIM_Type *p_reg, nrf_twim_event_t event)¶ Function for clearing the specified TWIM event.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
event – [in] Event to clear.
-
NRF_STATIC_INLINE bool
nrf_twim_event_check
(NRF_TWIM_Type const *p_reg, nrf_twim_event_t event)¶ Function for retrieving the state of the TWIM event.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
event – [in] Event to be checked.
- Returns true
The event has been generated.
- Returns false
The event has not been generated.
-
NRF_STATIC_INLINE uint32_t
nrf_twim_event_address_get
(NRF_TWIM_Type const *p_reg, nrf_twim_event_t event)¶ Function for getting the address of the specified TWIM event register.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
event – [in] The specified event.
- Returns
Address of the specified event register.
-
NRF_STATIC_INLINE void
nrf_twim_shorts_enable
(NRF_TWIM_Type *p_reg, uint32_t mask)¶ Function for enabling the specified shortcuts.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
mask – [in] Shortcuts to be enabled.
-
NRF_STATIC_INLINE void
nrf_twim_shorts_disable
(NRF_TWIM_Type *p_reg, uint32_t mask)¶ Function for disabling the specified shortcuts.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
mask – [in] Shortcuts to be disabled.
-
NRF_STATIC_INLINE void
nrf_twim_int_enable
(NRF_TWIM_Type *p_reg, uint32_t mask)¶ Function for enabling the specified interrupts.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
mask – [in] Mask of interrupts to be enabled.
-
NRF_STATIC_INLINE void
nrf_twim_int_disable
(NRF_TWIM_Type *p_reg, uint32_t mask)¶ Function for disabling the specified interrupts.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
mask – [in] Mask of interrupts to be disabled.
-
NRF_STATIC_INLINE uint32_t
nrf_twim_int_enable_check
(NRF_TWIM_Type const *p_reg, uint32_t mask)¶ Function for checking if the specified interrupts are enabled.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
mask – [in] Mask of interrupts to be checked.
- Returns
Mask of enabled interrupts.
-
NRF_STATIC_INLINE void
nrf_twim_subscribe_set
(NRF_TWIM_Type *p_reg, nrf_twim_task_t task, uint8_t channel)¶ Function for setting the subscribe configuration for a given TWIM task.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
task – [in] Task for which to set the configuration.
channel – [in] Channel through which to subscribe events.
-
NRF_STATIC_INLINE void
nrf_twim_subscribe_clear
(NRF_TWIM_Type *p_reg, nrf_twim_task_t task)¶ Function for clearing the subscribe configuration for a given TWIM task.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
task – [in] Task for which to clear the configuration.
-
NRF_STATIC_INLINE void
nrf_twim_publish_set
(NRF_TWIM_Type *p_reg, nrf_twim_event_t event, uint8_t channel)¶ Function for setting the publish configuration for a given TWIM event.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
event – [in] Event for which to set the configuration.
channel – [in] Channel through which to publish the event.
-
NRF_STATIC_INLINE void
nrf_twim_publish_clear
(NRF_TWIM_Type *p_reg, nrf_twim_event_t event)¶ Function for clearing the publish configuration for a given TWIM event.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
event – [in] Event for which to clear the configuration.
-
NRF_STATIC_INLINE void
nrf_twim_enable
(NRF_TWIM_Type *p_reg)¶ Function for enabling the TWIM peripheral.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
-
NRF_STATIC_INLINE void
nrf_twim_disable
(NRF_TWIM_Type *p_reg)¶ Function for disabling the TWIM peripheral.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
-
NRF_STATIC_INLINE void
nrf_twim_pins_set
(NRF_TWIM_Type *p_reg, uint32_t scl_pin, uint32_t sda_pin)¶ Function for configuring TWI pins.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
scl_pin – [in] SCL pin number.
sda_pin – [in] SDA pin number.
-
NRF_STATIC_INLINE uint32_t
nrf_twim_scl_pin_get
(NRF_TWIM_Type const *p_reg)¶ Function for retrieving the SCL pin selection.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
- Returns
SCL pin selection.
-
NRF_STATIC_INLINE uint32_t
nrf_twim_sda_pin_get
(NRF_TWIM_Type const *p_reg)¶ Function for retrieving the SDA pin selection.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
- Returns
SDA pin selection.
-
NRF_STATIC_INLINE void
nrf_twim_frequency_set
(NRF_TWIM_Type *p_reg, nrf_twim_frequency_t frequency)¶ Function for setting the TWI master clock frequency.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
frequency – [in] TWI frequency.
-
NRF_STATIC_INLINE uint32_t
nrf_twim_errorsrc_get_and_clear
(NRF_TWIM_Type *p_reg)¶ Function for checking the TWI error source.
The error flags are cleared after reading.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
- Returns
Mask with error source flags.
-
NRF_STATIC_INLINE void
nrf_twim_address_set
(NRF_TWIM_Type *p_reg, uint8_t address)¶ Function for setting the address to be used in TWI transfers.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
address – [in] Address to be used in transfers.
-
NRF_STATIC_INLINE void
nrf_twim_tx_buffer_set
(NRF_TWIM_Type *p_reg, uint8_t const *p_buffer, size_t length)¶ Function for setting the transmit buffer.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
p_buffer – [in] Pointer to the buffer with data to send.
length – [in] Maximum number of data bytes to transmit.
-
NRF_STATIC_INLINE void
nrf_twim_rx_buffer_set
(NRF_TWIM_Type *p_reg, uint8_t *p_buffer, size_t length)¶ Function for setting the receive buffer.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
p_buffer – [in] Pointer to the buffer for received data.
length – [in] Maximum number of data bytes to receive.
-
NRF_STATIC_INLINE void
nrf_twim_shorts_set
(NRF_TWIM_Type *p_reg, uint32_t mask)¶ Function for setting the specified shortcuts.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
mask – [in] Shortcuts to be set.
-
NRF_STATIC_INLINE uint32_t
nrf_twim_shorts_get
(NRF_TWIM_Type const *p_reg)¶ Function for getting the shortcut setting.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
- Returns
Current shortcut configuration.
-
NRF_STATIC_INLINE size_t
nrf_twim_txd_amount_get
(NRF_TWIM_Type const *p_reg)¶ Function for getting the amount of transmitted bytes.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
- Returns
Amount of transmitted bytes.
-
NRF_STATIC_INLINE size_t
nrf_twim_rxd_amount_get
(NRF_TWIM_Type const *p_reg)¶ Function for getting the amount of received bytes.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
- Returns
Amount of received bytes.
-
NRF_STATIC_INLINE void
nrf_twim_tx_list_enable
(NRF_TWIM_Type *p_reg)¶ Function for enabling the TX list feature.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
-
NRF_STATIC_INLINE void
nrf_twim_tx_list_disable
(NRF_TWIM_Type *p_reg)¶ Function for disabling the TX list feature.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
-
NRF_STATIC_INLINE void
nrf_twim_rx_list_enable
(NRF_TWIM_Type *p_reg)¶ Function for enabling the RX list feature.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
-
NRF_STATIC_INLINE void
nrf_twim_rx_list_disable
(NRF_TWIM_Type *p_reg)¶ Function for disabling the RX list feature.
- Parameters
p_reg – [in] Pointer to the structure of registers of the peripheral.
-