I2C#

sl_i2c_instance_t#

sl_i2c_instance_t

Enumeration to represent I2C instances.

sl_i2c_status_t#

sl_i2c_status_t

Enumeration to represent I2C driver status values.

sl_i2c_transfer_type_t#

sl_i2c_transfer_type_t

Enumeration to represent I2C transfer type.

sl_i2c_operating_mode_t#

sl_i2c_operating_mode_t

Enumeration to represent I2C operating mode.

sl_i2c_callback_t#

typedef void(* sl_i2c_callback_t) (sl_i2c_instance_t i2c_instance, uint32_t status) )(sl_i2c_instance_t i2c_instance, uint32_t status)

Callback for I2C Driver.

sl_i2c_driver_init#

sl_i2c_status_t sl_i2c_driver_init (sl_i2c_instance_t i2c_instance, const sl_i2c_config_t * p_user_config)

Initialize the I2C Module and clock.

Sets I2C instance mode, operating mode (bus-speed), frequency, and transfer type (using Interrupt or DMA). If the transfer type is DMA, it initializes DMA as well. Registers I2C instance callback and clears pending interrupts. Configures SDL and SCL pins as per the instance.

Returns

• status 0 if successful, else error code as follow

  • SL_I2C_SUCCESS (0x0000) - Success

  • SL_I2C_INVALID_PARAMETER (0x0F) - Parameters are invalid

  • SL_I2C_CALLBACK_BUSY (0x0D) - Driver is busy

sl_i2c_driver_set_follower_address#

sl_i2c_status_t sl_i2c_driver_set_follower_address (sl_i2c_instance_t i2c_instance, uint16_t address)

This API configures the follower address of the I2C module.

Should be used only in Follower mode after instance initialization. I2C leader device initiates an I2C transfer with an address that matches this address in the IC_SAR register of I2C follower device.

• Pre-conditions:

  • sl_i2c_driver_init

  • Here I2C mode should be set as follower mode

Returns

• status 0 if successful, else error code as follow

  • SL_I2C_SUCCESS (0x0000) - Success

  • SL_I2C_INVALID_PARAMETER (0x0F) - Parameters are invalid

sl_i2c_driver_configure_fifo_threshold#

sl_i2c_status_t sl_i2c_driver_configure_fifo_threshold (sl_i2c_instance_t i2c_instance, uint8_t tx_threshold_value, uint8_t rx_threshold_value)

This function is used to configure the TX and RX FIFO threshold values.

The valid range is 0-255, with the additional restriction that hardware does not allow this value to be set to a value larger than the depth of the buffer. A value of 0 sets the threshold for 1 entry, and a value of 255 sets the threshold for 256 entries. This should be called after I2C instance initialization.

• Pre-conditions:

  • sl_i2c_driver_init

Returns

• status 0 if successful, else error code as follow

  • SL_I2C_SUCCESS (0x0000) - Success

  • SL_I2C_INVALID_PARAMETER (0x0F) - Parameters are invalid

sl_i2c_driver_get_frequency#

sl_i2c_status_t sl_i2c_driver_get_frequency (sl_i2c_instance_t i2c_instance, uint32_t * frequency)

This API gets the current frequency of I2C transfer in MHz, by reading the system core clock frequency.

• Pre-conditions:

  • sl_i2c_driver_init

Returns

• status 0 if successful, else error code as follow

  • SL_I2C_SUCCESS (0x0000) - Success

  • SL_I2C_INVALID_PARAMETER (0x0F) - Parameters are invalid

sl_i2c_driver_send_data_blocking#

sl_i2c_status_t sl_i2c_driver_send_data_blocking (sl_i2c_instance_t i2c_instance, uint16_t address, uint8_t * tx_buffer, uint32_t tx_len)

This API sends the data in blocking mode (using interrupt), sets follower address when used in leader application, sets transmit empty interrupt and enable I2C interrupts.

• Pre-conditions:

  • sl_i2c_driver_init

  • Here transfer-type should be set as interrupt-type

  • sl_i2c_driver_set_follower_address (if sending from slave)

  • sl_i2c_driver_configure_fifo_threshold

Note

• Maximum tx_len used can be 80000 (receives in around 10 seconds)

Returns

• status 0 if successful, else error code as follow

  • SL_I2C_SUCCESS (0x0000) - Success

  • SL_I2C_INVALID_PARAMETER (0x0F) - Parameters are invalid

sl_i2c_driver_send_data_non_blocking#

sl_i2c_status_t sl_i2c_driver_send_data_non_blocking (sl_i2c_instance_t i2c_instance, uint16_t address, uint32_t * tx_buffer, uint32_t tx_len, sl_i2c_dma_config_t * p_dma_config)

This API sends the data in non-blocking mode (using DMA), also sets the follower address when used in Leader application.

Configures DMA rx and tx channels. Registers DMA callback & enables DMA channels.

• Pre-conditions:

  • sl_i2c_driver_init

  • Here transfer-type should be set as DMA-type

  • sl_i2c_driver_set_follower_address, if used in salve application

Note

• Maximum tx_len values can be 30000 (receives back in around 4 seconds)

Returns

• status 0 if successful, else error code as follow

  • SL_I2C_SUCCESS (0x0000) - Success

  • SL_I2C_INVALID_PARAMETER (0x0F) - Parameters are invalid

  • SL_DMA_TRANSFER_ERROR - DMA parameters are invalid

sl_i2c_driver_receive_data_blocking#

sl_i2c_status_t sl_i2c_driver_receive_data_blocking (sl_i2c_instance_t i2c_instance, uint16_t address, uint8_t * rx_buffer, uint32_t rx_len)

This API receives the data in blocking mode (using interrupt), also sets the follower address when used in Leader application.

Sets receive full interrupt and enables I2C interrupts.

• Pre-conditions:

  • sl_i2c_driver_init

  • Here transfer-type should be set as interrupt-type

  • sl_i2c_driver_set_follower_address, if used in follower application

  • sl_i2c_driver_configure_fifo_threshold

Note

• Maximum rx_len used can be 80000 (receives in around 10 seconds)

Returns

• status 0 if successful, else error code as follow

  • SL_I2C_SUCCESS (0x0000) - Success

  • SL_I2C_INVALID_PARAMETER (0x0F) - Parameters are invalid

sl_i2c_driver_receive_data_non_blocking#

sl_i2c_status_t sl_i2c_driver_receive_data_non_blocking (sl_i2c_instance_t i2c_instance, uint16_t address, uint8_t * rx_buffer, uint32_t rx_len, sl_i2c_dma_config_t * p_dma_config)

This API receives the data in non-blocking mode (using DMA), also sets the follower address when used in Leader application.

Configures DMA rx and tx channels. Registers DMA callback & enables DMA channels.

• Pre-conditions:

  • sl_i2c_driver_init

  • Here transfer-type should be set as DMA-type

  • sl_i2c_driver_set_follower_address, if used in salve application

Note

• Maximum rx_len values can be 30000 (receives back in around 4 seconds)

Returns

• status 0 if successful, else error code as follow

  • SL_I2C_SUCCESS (0x0000) - Success

  • SL_I2C_INVALID_PARAMETER (0x0F) - Parameters are invalid

  • SL_DMA_TRANSFER_ERROR - DMA parameters are invalid

sl_i2c_driver_transfer_data#

sl_i2c_status_t sl_i2c_driver_transfer_data (sl_i2c_instance_t i2c_instance, sl_i2c_transfer_config_t const * p_transfer_config, uint16_t address)

This API first transmits data and then receives data from an I2C device (using interrupts).

Also sets follower address when used in Leader application. Sets & enable transmit empty interrupt while transmitting data . Sets & enable receive full interrupt while receiving data

• Pre-conditions:

  • sl_i2c_driver_init

  • Here transfer-type should be set as Interrupt-type

  • sl_i2c_driver_set_follower_address, if used in follower application

Note

• Maximum tx_len & rx_len values can be 80000 (sends & receives back in around 20 seconds)

Returns

• status 0 if successful, else error code as follow

  • SL_I2C_SUCCESS (0x0000) - Success

  • SL_I2C_INVALID_PARAMETER (0x0F) - Parameters are invalid

sl_i2c_driver_deinit#

sl_i2c_status_t sl_i2c_driver_deinit (sl_i2c_instance_t i2c_instance)

De-initializes the I2C peripheral, disables clock, and unregisters the callback.

• Pre-conditions:

  • sl_i2c_driver_init

Returns

• status 0 if successful, else error code as follow

  • SL_I2C_SUCCESS (0x0000) - Success

  • SL_I2C_INVALID_PARAMETER (0x0F) - Parameters are invalid

sl_si91x_i2c_pin_init#

sl_i2c_status_t sl_si91x_i2c_pin_init (sl_i2c_pin_init_t * pin_init)

Set the Pin configuration for I2C.

It configures the SDA and SCL pins. Also enables internal pullups of SDA & SCL lines of follower device.

Returns

• status 0 if successful, else error code as follow

  • SL_I2C_SUCCESS (0x0000) - Success

  • SL_I2C_INVALID_PARAMETER (0x0F) - Parameters are invalid

SL_I2C0_DMA_TX_CHANNEL#

#define SL_I2C0_DMA_TX_CHANNEL

31

I2C Peripheral.

Overview#

I2C standard compliant bus interface with open-drain pins Configurable as Primary or Secondary Four speed modes: Standard Mode (100 kbps), Fast Mode (400 kbps), Fast Mode Plus (1Mbps) and High-Speed Mode (3.4 Mbps) 7 or 10-bit addressing 7 or 10-bit combined format transfers Support for Clock synchronization and Bus Clear Programmable SDA Hold time Integrated transmit and receive buffers with support for DMA Bulk transmit mode in I2C Slave mode Interrupt based operation (polled mode also available)

Initialization#

Call init API with the init parameters. Call set follower address API, in follower mode Call Set FIFO threshold API

SL_I2C0_DMA_RX_CHANNEL#

#define SL_I2C0_DMA_RX_CHANNEL

30

SL_I2C1_DMA_TX_CHANNEL#

#define SL_I2C1_DMA_TX_CHANNEL

3

SL_I2C1_DMA_RX_CHANNEL#

#define SL_I2C1_DMA_RX_CHANNEL

2

SL_I2C2_DMA_TX_CHANNEL#

#define SL_I2C2_DMA_TX_CHANNEL

5

SL_I2C2_DMA_RX_CHANNEL#

#define SL_I2C2_DMA_RX_CHANNEL

4