OS-independent SPEAr UART HAL

AN3123

24/30

Doc ID 16862 Rev 2

10.3

UART_Init()

This routine is used to initialize the UART. This function sets the default settings and enables

the UART.

t_UARTError UART_Init(struct spear_uart **uart_device, t_UARTId

UARTId)

This function sets the default settings as shown in the example below:

struct spear_uart_config *dev;

dev->FIFOStatus

= FIFO_ENABLE;

dev->BaudRate

= BAUD115200;

dev->WordLength

= DATA8;

dev->StopBitSelect

= STOP1;

dev->ParitySelect

= PARITY_DISABLE;

dev->TxWatermarkLevel

= OneByTwo;

dev->RxWatermarkLevel

= OneByTwo;

dev->TxEnable

= TRUE;

dev->RxEnable

= TRUE;

dev->UARTId

= UARTId;

10.4

UART_Configure()

This function is used to configure a UART device. It first disables the UART, then finds the

integral and fractional baud rate and configures the line control register, control register and

various interrupt registers, etc. and finally enables the UART.

t_UARTError UART_Configure(struct spear_uart_config *dev)

●

UARTId: Identify the UART device

●

Config: Configuration information

The configuration information is selected as follows:

●

ParitySelect: If it is already zero, this means that odd parity is selected. If EVEN then

even parity is selected, otherwise invalid parity is selected.

●

WordLength: Its value can be chosen from the table given below:

Table 15.

WordLength values

Option

Value

DATA8

WORD_LENGTH_8

DATA7

WORD_LENGTH_7

DATA6

WORD_LENGTH_6

DATA5

Already zero