usart.h — Maple v0.0.11 Documentation

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# `usart.h`

[Stub] support.

## Library Documentation

> USART definitions and prototypes.

> Author: | Marti Bolivar <>, Perry Hung <>

> Defines

> > USART1_BASE

> >   USART1 register map base pointer.

> > USART2_BASE

> >   USART2 register map base pointer.

> > USART3_BASE

> >   USART3 register map base pointer.

> > USART_SR_CTS_BIT

> > USART_SR_LBD_BIT

> > USART_SR_TXE_BIT

> > USART_SR_TC_BIT

> > USART_SR_RXNE_BIT

> > USART_SR_IDLE_BIT

> > USART_SR_ORE_BIT

> > USART_SR_NE_BIT

> > USART_SR_FE_BIT

> > USART_SR_PE_BIT

> > USART_SR_CTS

> > USART_SR_LBD

> > USART_SR_TXE

> > USART_SR_TC

> > USART_SR_RXNE

> > USART_SR_IDLE

> > USART_SR_ORE

> > USART_SR_NE

> > USART_SR_FE

> > USART_SR_PE

> > USART_DR_DR

> > USART_BRR_DIV_MANTISSA

> > USART_BRR_DIV_FRACTION

> > USART_CR1_UE_BIT

> > USART_CR1_M_BIT

> > USART_CR1_WAKE_BIT

> > USART_CR1_PCE_BIT

> > USART_CR1_PS_BIT

> > USART_CR1_PEIE_BIT

> > USART_CR1_TXEIE_BIT

> > USART_CR1_TCIE_BIT

> > USART_CR1_RXNEIE_BIT

> > USART_CR1_IDLEIE_BIT

> > USART_CR1_TE_BIT

> > USART_CR1_RE_BIT

> > USART_CR1_RWU_BIT

> > USART_CR1_SBK_BIT

> > USART_CR1_UE

> > USART_CR1_M

> > USART_CR1_WAKE

> > USART_CR1_WAKE_IDLE

> > USART_CR1_WAKE_ADDR

> > USART_CR1_PCE

> > USART_CR1_PS

> > USART_CR1_PS_EVEN

> > USART_CR1_PS_ODD

> > USART_CR1_PEIE

> > USART_CR1_TXEIE

> > USART_CR1_TCIE

> > USART_CR1_RXNEIE

> > USART_CR1_IDLEIE

> > USART_CR1_TE

> > USART_CR1_RE

> > USART_CR1_RWU

> > USART_CR1_RWU_ACTIVE

> > USART_CR1_RWU_MUTE

> > USART_CR1_SBK

> > USART_CR2_LINEN_BIT

> > USART_CR2_CLKEN_BIT

> > USART_CR2_CPOL_BIT

> > USART_CR2_CPHA_BIT

> > USART_CR2_LBCL_BIT

> > USART_CR2_LBDIE_BIT

> > USART_CR2_LBDL_BIT

> > USART_CR2_LINEN

> > USART_CR2_STOP

> > USART_CR2_STOP_BITS_1

> > USART_CR2_STOP_BITS_POINT_5

> > USART_CR2_STOP_BITS_1_POINT_5

> > USART_CR2_STOP_BITS_2

> > USART_CR2_CLKEN

> > USART_CR2_CPOL

> > USART_CR2_CPOL_LOW

> > USART_CR2_CPOL_HIGH

> > USART_CR2_CPHA

> > USART_CR2_CPHA_FIRST

> > USART_CR2_CPHA_SECOND

> > USART_CR2_LBCL

> > USART_CR2_LBDIE

> > USART_CR2_LBDL

> > USART_CR2_LBDL_10_BIT

> > USART_CR2_LBDL_11_BIT

> > USART_CR2_ADD

> > USART_CR3_CTSIE_BIT

> > USART_CR3_CTSE_BIT

> > USART_CR3_RTSE_BIT

> > USART_CR3_DMAT_BIT

> > USART_CR3_DMAR_BIT

> > USART_CR3_SCEN_BIT

> > USART_CR3_NACK_BIT

> > USART_CR3_HDSEL_BIT

> > USART_CR3_IRLP_BIT

> > USART_CR3_IREN_BIT

> > USART_CR3_EIE_BIT

> > USART_CR3_CTSIE

> > USART_CR3_CTSE

> > USART_CR3_RTSE

> > USART_CR3_DMAT

> > USART_CR3_DMAR

> > USART_CR3_SCEN

> > USART_CR3_NACK

> > USART_CR3_HDSEL

> > USART_CR3_IRLP

> > USART_CR3_IRLP_NORMAL

> > USART_CR3_IRLP_LOW_POWER

> > USART_CR3_IREN

> > USART_CR3_EIE

> > USART_GTPR_GT

> > USART_GTPR_PSC

> > USART_RX_BUF_SIZE

> Functions

> > void usart_init(usart_dev * dev)

> >   Initialize a serial port.

> >   Parameters:

> >   - `dev` -

> >     Serial port to be initialized

> > void usart_set_baud_rate(usart_dev * dev, uint32 clock_speed, uint32 baud)

> >   Configure a serial port’s baud rate.

> >   Parameters:

> >   - `dev` -

> >     Serial port to be configured

> >   - `clock_speed` -

> >     Clock speed, in megahertz.

> >   - `baud` -

> >     Baud rate for transmit/receive.

> > void usart_enable(usart_dev * dev)

> >   Enable a serial port.

> >   USART is enabled in single buffer transmission mode, multibuffer receiver mode, 8n1.

> >   Serial port must have a baud rate configured to work properly.

> >   Parameters:

> >   - `dev` -

> >     Serial port to enable.

> >   See: | usart_set_baud_rate()

> > void usart_disable(usart_dev * dev)

> >   Turn off a serial port.

> >   Parameters:

> >   - `dev` -

> >     Serial port to be disabled

> > void usart_foreach(void(*)( usart_dev *dev) fn)

> > uint32 usart_tx(usart_dev * dev, const uint8 * buf, uint32 len)

> >   Nonblocking USART transmit.

> >   Parameters:

> >   - `dev` -

> >     Serial port to transmit over

> >   - `buf` -

> >     Buffer to transmit

> >   - `len` -

> >     Maximum number of bytes to transmit

> >   Return: | Number of bytes transmitted

> > void usart_putudec(usart_dev * dev, uint32 val)

> >   Transmit an unsigned integer to the specified serial port in decimal format.

> >   This function blocks until the integer’s digits have been completely transmitted.

> >   Parameters:

> >   - `dev` -

> >     Serial port to send on

> >   - `val` -

> >     Number to print

> > void usart_disable_all(void )

> >   Disable all serial ports.

> > void usart_putc(usart_dev * dev, uint8 byte)

> >   Transmit one character on a serial port.

> >   This function blocks until the character has been successfully transmitted.

> >   Parameters:

> >   - `dev` -

> >     Serial port to send on.

> >   - `byte` -

> >     Byte to transmit.

> > void usart_putstr(usart_dev * dev, const char * str)

> >   Transmit a character string on a serial port.

> >   This function blocks until str is completely transmitted.

> >   Parameters:

> >   - `dev` -

> >     Serial port to send on

> >   - `str` -

> >     String to send

> > uint8 usart_getc(usart_dev * dev)

> >   Read one character from a serial port.

> >   It’s not safe to call this function if the serial port has no data available.

> >   Parameters:

> >   - `dev` -

> >     Serial port to read from

> >   Return: | byte read
> >   See: | usart_data_available()

> > uint32 usart_data_available(usart_dev * dev)

> >   Return the amount of data available in a serial port’s RX buffer.

> >   Parameters:

> >   - `dev` -

> >     Serial port to check

> >   Return: | Number of bytes in dev’s RX buffer.

> > void usart_reset_rx(usart_dev * dev)

> >   Discard the contents of a serial port’s RX buffer.

> >   Parameters:

> >   - `dev` -

> >     Serial port whose buffer to empty.

> Variables

> > usart_dev * USART1

> >   USART1 device.

> > usart_dev * USART2

> >   USART2 device.

> > usart_dev * USART3

> >   USART3 device.

> class usart_reg_map

> > USART register map type.

> > Public Members

> > > __io uint32 SR

> > >   Status register.

> > > __io uint32 DR

> > >   Data register.

> > > __io uint32 BRR

> > >   Baud rate register.

> > > __io uint32 CR1

> > >   Control register 1.

> > > __io uint32 CR2

> > >   Control register 2.

> > > __io uint32 CR3

> > >   Control register 3.

> > > __io uint32 GTPR

> > >   Guard time and prescaler register.

> class usart_dev

> > USART device type.

> > Public Members

> > > usart_reg_map * regs

> > >   Register map.

> > > ring_buffer * rb

> > >   RX ring buffer.

> > > uint32 max_baud

> > >   Maximum baud.

> > > uint8 rx_buf[USART_RX_BUF_SIZE]

> > >   Actual RX buffer used by rb.

> > > rcc_clk_id clk_id

> > >   RCC clock information.

> > > nvic_irq_num irq_num

> > >   USART NVIC interrupt.

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