AN3123

OS-independent SPEAr UART HAL

Doc ID 16862 Rev 2

23/30

10

OS-independent SPEAr UART HAL

This section describes an OS independent hardware abstraction layer (HAL) for the SPEAr

UART which you can use as a starting point for developing your own HAL code.

10.1

SetBaseDevice()

This API sets the base address of the UART.

static t_UARTError SetBaseDevice(volatile u32 *SPEAR_UART_APB_BASE,

struct spear_uart_config *dev)

●

UARTId: Identify the UART device

If the UARTId is UART0 or UART1, then it is a valid input for it otherwise it is said to be an

invalid UART ID.

10.2

GetBaudDivisor()

This function returns the integer and fractional values of the baud rate divisor.

static u32 GetBaudDivisor(t_UARTBaudRate BaudRate, u32

*IntegralVal)

●

BaudRate: Baud rate to be configured

●

IntegralVal - Baud rate divisor's integral value

Baud rate is a constant value & can be selected from the table given below

:

Table 14.

Baud rate values

Option

Value

BAUD110

110

BAUD300

300

BAUD1200

1200

BAUD2400

2400

BAUD4800

4800

BAUD9600

9600

BAUD19200

19200

BAUD38400

38400

BAUD57600

57600

BAUD115200

115200

BAUD230400

230400

BAUD460800

460800