Renesas Single-Chip Microcomputer M38C89T-ADF Bedienungsanleitung PDF herunterladen (Seite 109)

Rev.1.00 May 22 2012

REJ09B0566

4-89

Library Reference

4.2.9 40BSerial Communication Interface R_SCI_GetStatus

6) R_SCI_GetStatus

Synopsis

Check the status of a SCI channel.

Prototype bool R_SCI_GetStatus(

uint8_t data1, // Channel selection

uint8_t * data2, // Status flags

uint8_t * data3, // Characters transmitted

uint8_t * data4

// Characters received

);

Description

Acquires status of SCI transmission / reception.

[data1]

Select channel SCIFn (where n = 0 to 7).

[data2]

The status flags shall be stored in the format:

b7 to b6 b5 b4 b3 – b0

0: Transmit idle

1: Transmission in progress

0: Receive idle

1: Reception in progress

[data3]

The storage locations for the number of characters that are have been transmitted in the current transmission.

Specify PDL_NA if this information is not required.

[data4]

The storage locations for the number of characters that are have been received in the current reception

process. Specify PDL_NA if this information is not required.

Return value

True if all parameters are valid and the operation completed; false if a parameter was out of range.

Category

SCI

Reference

R_SCI_Send, R_SCI_Receive

Remarks

None.

Program example

/* PDL definitions */

#include “r_pdl_sci.h”

/* PDL device-specific definitions */

#include “r_pdl_definitions.h”

uint8_t StatusValue;

uint32_t TxChars;

uint32_t RxChars;

void func(void)

{

/* Read the status of SCI channel 0 */

R_SCI_GetStatus(

&StatusValue,

&TxChars,

&RxChars

);

}

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