Renesas Single-Chip Microcomputer M38C89T-ADF Manual de usuario descargar pdf (Pagina 106)

Rev.1.00 May 22 2012

REJ09B0566

4-86

Library Reference

4.2.9 40BSerial Communication Interface

R_SCI_Receive

4) R_SCI_Receive

Synopsis

Receive a string of characters.

Prototype bool R_SCI_Receive(

uint8_t data1, // Channel selection

uint8_t data1, // DMA Channel selection

uint8_t * data2, // Receive buffer pointer

uint8_t data3, // Receive threshold

void * func1, // Callback function

void * func2( uint8_t ), // Callback function

void * func3 // Callback function

);

Description

Enable SCI reception and acquire any incoming data.

[data1]

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

[data2]

The storage area for the expected data.

A null character shall be appended to the received data if more than one character is expected.

[data3]

The number of characters that must be received before the function completes or the callback function is

called.

[func1]

The function to be called when the number of received characters reaches the threshold number.

While the receive operation is in progress:

R_SCI_GetStatus can be used to find out how many characters have been received so far.

R_SCI_Stop can be used to terminate this operation early.

Specify PDL_NO_FUNC for this function to continue until the required number of characters has been

received.

[func2]

The function to be called if a receive error occurs. The error flags shall be supplied to the function in the

format of the Serial Status Register:

b7 b6 b5 b4 b3 b2 b1 b0

0 0 ORER FRE PER 0 0 0

ORER: Overrun error

FRE: Framing error

PER: Parity error

Specify PDL_NO_FUNC to ignore errors.

[func3]

The function to be called if the Break signal is detected.

Specify PDL_NO_FUNC to ignore Break signals.

Return value True if all parameters are valid and the operation completed;

False if a parameter was out of range or if the channel was already receiving.

Category

SCI

Reference

R_SCI_Create, R_SCI_Stop, R_SCI_GetStatus

Remarks (1/2) • The maximum number of characters to be received is 255.

• This function will wait until a transmission is complete before enabling the reception.

• If callback function func1 is specified, reception interrupts are used.

Please see the notes on callback function usage

• If no callback function func1 is specified, this function will monitor the RXI flag to manage the data

reception. If the SCI channel’s control registers are directly modified by the user, this function may lock

up.

• Error flags are cleared automatically.

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