i2c.h — Maple v0.0.11 Documentation

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# `i2c.h`

[Stub] support.

## Library Documentation

> Inter-Integrated Circuit (I2C) peripheral support.

> Defines

> > I2C_MSG_READ

> > I2C_MSG_10BIT_ADDR

> > I2C1_BASE

> >   I2C1 register map base pointer.

> > I2C2_BASE

> >   I2C2 register map base pointer.

> > I2C_CR1_SWRST

> > I2C_CR1_ALERT

> > I2C_CR1_PEC

> > I2C_CR1_POS

> > I2C_CR1_ACK

> > I2C_CR1_START

> > I2C_CR1_STOP

> > I2C_CR1_PE

> > I2C_CR2_LAST

> > I2C_CR2_DMAEN

> > I2C_CR2_ITBUFEN

> > I2C_CR2_ITEVTEN

> > I2C_CR2_ITERREN

> > I2C_CR2_FREQ

> > I2C_CCR_FS

> > I2C_CCR_DUTY

> > I2C_CCR_CCR

> > I2C_SR1_SB

> > I2C_SR1_ADDR

> > I2C_SR1_BTF

> > I2C_SR1_ADD10

> > I2C_SR1_STOPF

> > I2C_SR1_RXNE

> > I2C_SR1_TXE

> > I2C_SR1_BERR

> > I2C_SR1_ARLO

> > I2C_SR1_AF

> > I2C_SR1_OVR

> > I2C_SR1_PECERR

> > I2C_SR1_TIMEOUT

> > I2C_SR1_SMBALERT

> > I2C_SR2_MSL

> > I2C_SR2_BUSY

> > I2C_SR2_TRA

> > I2C_SR2_GENCALL

> > I2C_SR2_SMBDEFAULT

> > I2C_SR2_SMBHOST

> > I2C_SR2_DUALF

> > I2C_SR2_PEC

> > I2C_FAST_MODE

> > I2C_DUTY_16_9

> > I2C_REMAP

> > I2C_BUS_RESET

> > I2C_ERROR_PROTOCOL

> > I2C_ERROR_TIMEOUT

> > I2C_IRQ_ERROR

> >   Enable one or more I2C interrupts.

> >   Parameters:

> >   - `dev` -

> >     I2C device

> >   - `irqs` -

> >     Bitwise or of: I2C_IRQ_ERROR (error interrupt), I2C_IRQ_EVENT (event interrupt), and I2C_IRQ_BUFFER (buffer interrupt).

> > I2C_IRQ_EVENT

> > I2C_IRQ_BUFFER

> Enums

> > i2c_state enum

> >   I2C device states.

> >   Values:

> >   - `I2C_STATE_DISABLED``= 0` -

> >     Disabled.

> >   - `I2C_STATE_IDLE``= 1` -

> >     Idle.

> >   - `I2C_STATE_XFER_DONE``= 2` -

> >     Done with transfer.

> >   - `I2C_STATE_BUSY``= 3` -

> >     Busy.

> >   - `I2C_STATE_ERROR``= -1` -

> >     Error occurred.

> Functions

> > void i2c_init(i2c_dev * dev)

> >   Initialize an I2C device and reset its registers to their default values.

> >   Parameters:

> >   - `dev` -

> >     Device to initialize.

> > void i2c_master_enable(i2c_dev * dev, uint32 flags)

> >   Initialize an I2C device as bus master.

> >   Parameters:

> >   - `dev` -

> >     Device to enable

> >   - `flags` -

> >     Bitwise or of the following I2C options: I2C_FAST_MODE: 400 khz operation, I2C_DUTY_16_9: 16/9 Tlow/Thigh duty cycle (only applicable for fast mode), I2C_BUS_RESET: Reset the bus and clock out any hung slaves on initialization, I2C_10BIT_ADDRESSING: Enable 10-bit addressing, I2C_REMAP: Remap I2C1 to SCL/PB8 SDA/PB9.

> > int32 i2c_master_xfer(i2c_dev * dev, i2c_msg * msgs, uint16 num, uint32 timeout)

> >   Process an i2c transaction.

> >   Transactions are composed of one or more i2c_msg’s, and may be read or write tranfers. Multiple i2c_msg’s will generate a repeated start in between messages.

> >   Parameters:

> >   - `dev` -

> >     I2C device

> >   - `msgs` -

> >     Messages to send/receive

> >   - `num` -

> >     Number of messages to send/receive

> >   - `timeout` -

> >     Bus idle timeout in milliseconds before aborting the transfer. 0 denotes no timeout.

> >   Return: | 0 on success, I2C_ERROR_PROTOCOL if there was a protocol error, I2C_ERROR_TIMEOUT if the transfer timed out.

> > void i2c_bus_reset(const i2c_dev * dev)

> >   Reset an I2C bus.

> >   Reset is accomplished by clocking out pulses until any hung slaves release SDA and SCL, then generating a START condition, then a STOP condition.

> >   Parameters:

> >   - `dev` -

> >     I2C device

> > void i2c_disable(i2c_dev * dev)

> >   Disable an I2C device.

> >   This function disables the corresponding peripheral and marks dev’s state as I2C_STATE_DISABLED.

> >   Parameters:

> >   - `dev` -

> >     Device to disable.

> > void i2c_peripheral_enable(i2c_dev * dev)

> >   Turn on an I2C peripheral.

> >   Parameters:

> >   - `dev` -

> >     Device to enable

> > void i2c_peripheral_disable(i2c_dev * dev)

> >   Turn off an I2C peripheral.

> >   Parameters:

> >   - `dev` -

> >     Device to turn off

> > void i2c_write(i2c_dev * dev, uint8 byte)

> >   Fill transmit register.

> >   Parameters:

> >   - `dev` -

> >     I2C device

> >   - `byte` -

> >     Byte to write

> > void i2c_set_input_clk(i2c_dev * dev, uint32 freq)

> >   Set input clock frequency, in MHz.

> >   Parameters:

> >   - `dev` -

> >     I2C device

> >   - `freq` -

> >     Frequency in megahertz (2-36)

> > void i2c_set_clk_control(i2c_dev * dev, uint32 val)

> >   Set I2C clock control register.

> >   See RM008

> >   Parameters:

> >   - `dev` -

> >     I2C device

> >   - `val` -

> >     Value to use for clock control register (in Fast/Standard mode)

> > void i2c_set_trise(i2c_dev * dev, uint32 trise)

> >   Set SCL rise time.

> >   Parameters:

> >   - `dev` -

> >     I2C device

> >   - `trise` -

> >     Maximum rise time in fast/standard mode (see RM0008 for relevant formula).

> > void i2c_start_condition(i2c_dev * dev)

> >   Generate a start condition on the bus.

> >   Parameters:

> >   - `dev` -

> >     I2C device

> > void i2c_stop_condition(i2c_dev * dev)

> >   Generate a stop condition on the bus.

> >   Parameters:

> >   - `dev` -

> >     I2C device

> > void i2c_enable_irq(i2c_dev * dev, uint32 irqs)

> > void i2c_disable_irq(i2c_dev * dev, uint32 irqs)

> >   Disable one or more I2C interrupts.

> >   Parameters:

> >   - `dev` -

> >     I2C device

> >   - `irqs` -

> >     Bitwise or of: I2C_IRQ_ERROR (error interrupt), I2C_IRQ_EVENT (event interrupt), and I2C_IRQ_BUFFER (buffer interrupt).

> > void i2c_enable_ack(i2c_dev * dev)

> >   Enable I2C acknowledgment.

> >   Parameters:

> >   - `dev` -

> >     I2C device

> > void i2c_disable_ack(i2c_dev * dev)

> >   Disable I2C acknowledgment.

> >   Parameters:

> >   - `dev` -

> >     I2C device

> Variables

> > i2c_dev *const I2C1

> >   I2C1 device.

> > i2c_dev *const I2C2

> >   I2C2 device.

> class i2c_reg_map

> > I2C register map type.

> > Public Members

> > > __io uint32 CR1

> > >   Control register 1.

> > > __io uint32 CR2

> > >   Control register 2.

> > > __io uint32 OAR1

> > >   Own address register 1.

> > > __io uint32 OAR2

> > >   Own address register 2.

> > > __io uint32 DR

> > >   Data register.

> > > __io uint32 SR1

> > >   Status register 1.

> > > __io uint32 SR2

> > >   Status register 2.

> > > __io uint32 CCR

> > >   Clock control register.

> > > __io uint32 TRISE

> > >   TRISE register.

> class i2c_msg

> > I2C message type.

> > Public Members

> > > uint16 addr

> > >   Address.

> > > uint16 flags

> > >   Bitwise OR of I2C_MSG_READ and I2C_MSG_10BIT_ADDR.

> > > uint16 length

> > >   Message length.

> > > uint16 xferred

> > >   Messages transferred.

> > > uint8 * data

> > >   Data.

> class i2c_dev

> > I2C device type.

> > Public Members

> > > i2c_reg_map * regs

> > >   Register map.

> > > gpio_dev * gpio_port

> > >   SDA, SCL pins’ GPIO port.

> > > uint8 sda_pin

> > >   SDA bit on gpio_port.

> > > uint8 scl_pin

> > >   SCL bit on gpio_port.

> > > rcc_clk_id clk_id

> > >   RCC clock information.

> > > nvic_irq_num ev_nvic_line

> > >   Event IRQ number.

> > > nvic_irq_num er_nvic_line

> > >   Error IRQ number.

> > > i2c_state state

> > >   Device state.

> > > uint16 msgs_left

> > >   Messages left.

> > > i2c_msg * msg

> > >   Messages.

> > > uint32 timestamp

> > >   For internal use.

> > > uint32 error_flags

> > >   Error flags, set on I2C error condition.

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