Maxim-integrated 73S12xxF Software Bedienungsanleitung PDF herunterladen (Seite 40)

73S12xxF Software User Guide UG_12xxF_016

40 Rev. 1.50

After calling Serial_Init() and prior to receiving data from the RS232 interface, Serial_Rx() and Serial_Tx()

must be called to pass on the receive/transmit buffer pointer, which is used to store Rx and Tx characters,

respectively. For a sample of the Serial API usage, see the Pseudo-CCID application source code.

Serial_Init()

Purpose Configure the communication speed, flow control, character parity and number of

stop bits. The serial interrupt service routine is NOT maskable, the interrupt vector is

set internally, so using Set_Event (eSerial, ...) will not have any effect. The baud

rates listed below are available for specific CPU clock speeds only. Review the

API_Struct_12.h for more information.

Synopsis Bbool Serial_Init (

IN enum SERIAL_SPD speed,

IN Boolean parity_en,

IN Boolean parity,

IN Boolean two_stop_bits,

IN Boolean xon_xoff )

Parameters Speed: Input parameter

This selects the communication speed. Possible values are:

_RATE_600, 0

_RATE_1200, 1

_RATE_2400, 2

_RATE_4800, 3

_RATE_9600, 4

_RATE_14400, 5

_RATE_19200, 6

_RATE_28800, 7

_RATE_38400, 8

_RATE_57600, 9

_RATE_115200, 10

_RATE_125000, 11

_RATE_250000, 12

_RATE_375000 13

Parity_enb: Input parameter

Specifies if the exchanged characters contain a parity bit (TRUE) or not (FALSE).

parity: Input parameter

Specifies if the characters parity bits must be odd (TRUE) or even (FALSE).

Two_stop_bits: Input parameter

Specifies if the exchanged characters contain two stop bits (TRUE) or one (FALSE).

xon_xoff: Input parameter

Specifies if Xon_Xoff control is on (TRUE) or off (FALSE).

Return Codes None.

The lower speeds help support Plug & Play.

Serial_Tx()

Purpose Setup the Tx buffer before sending data to the PC UART. An application should call

this API immediately after calling Serial_Init().

Synopsis enum SERIAL_RC data *Serial_Tx ( U08x xdata *buffer, U16 len )

Parameters buffer: Input parameter

Specifies a pointer to the data buffer containing data to send to the PC UART.

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