UART1 Mode2

Enumerations
enum	uart1_mode2_baudrate_t { baudrate_172800 = 172800U , baudrate_345600 = 345600U }
	UART1 baud rate enumeration.

init
UART1 initialization functions
#define	uart1_mode2_init(pins, baudRate)
	Initializes UART1 in Mode 0.

Detailed Description

Functions and data structures for UART1 communication in Mode 2.

Mode 2 provides asynchronous communication with fixed baud rate and 9-bit data. 9-N-1.

The baud rate is fixed at 1/32 (or 1/64) the System clock cycle.

Attention

Baud rate is biased by frequency divider

See also

uart1_send_9bit()

uart1_receive_9bit()

is_uart1_send_byte_complete()

is_uart1_receive_byte_complete()

Author

Michael Golovanov

Macro Definition Documentation

uart1_mode2_init

#define uart1_mode2_init	(		pins,
			baudRate
	)

Value:

do {                                                                            \
    enable_mcu_interrupts();                                                    \
    enable_uart1_interrupt();                                                   \
                                                                                \
    /* PCON.7 always set to 1. Is it error? */                                  \
    baudRate == baudrate_345600 ? bit_set(PCON, SBIT7) : bit_clr(PCON, SBIT7);  \
                                                                                \
    /* SM1 = 1, SM0 = 0 to select UART1 mode2 */                                \
    SCON = 0x90;                                                                \
                                                                                \
    /* Set AUXR1 bits 6, 7 to select RxD/TxD pins */                            \
    AUXR1 &= 0x3F;                                                              \
    AUXR1 |= pins;                                                              \
} while (0)

Initializes UART1 in Mode 0.

Must be called before any UART communication is initiated.

Parameters

pins	uart1_pins_t The desired UART1 pins.
baudRate	uart1_mode2_baudrate_t The desired UART1 baud rate.

Attention

Baud rate is biased by frequency divider.