Maxim-integrated 73S12xxF Software Manual do Utilizador descarregar pdf (Página 42)

73S12xxF Software User Guide UG_12xxF_016

42 Rev. 1.50

len: Input parameter.

Specifies the maximum number of bytes to receive at any one time.

Return Codes On a successful completion or termination, the serial Status will return one of the following:

S_EMPTY Reception has started but the receive buffer is still empty.

S_PENDING Reception has started, but is not yet completed.

S_FULL Reception has started and the buffer is now full.

S_PARITY_ERR Parity error occurred on the received byte(s).

S_OVERRUN Buffer overrun, which may result in a loss of at least 1 byte.

Serial_CRx()

Purpose Get additional bytes from the receiving buffer.

Synopsis Unsigned Integer Serial_CRx ( U08x xdata *buffer, U16 len )

Parameters buffer: Input parameter

Specifies a pointer to the data buffer to store the data received from the PC UART.

len: Input parameter.

Specifies the maximum number of bytes to receive at any one time.

Return Value Upon completion, returns the number of bytes received thus far.

Serial_RxLen()

Purpose Number of bytes received thus far.

Synopsis Unsigned Integer Serial_ RxLen ( void )

Parameters None.

Return Value Unsigned integer specifying the number of bytes received thus far.

Serial_RxByte ()

Purpose Get a quick byte out of the input buffer.

Synopsis Unsigned Char Serial_RxByte ( void )

Parameters None.

Return Value Byte received from the serial interface.

This function performs similarly as Serial_CRx ( U08 &cbyte, 1 ) but has much less overhead. Use this

API when performance optimization is required yet only one byte can be read at a time.

4.2.7 USB API – Available with 64K Flash version of the 73S12xxF

This API manages the USB interface which is compatible with the USB Specifications 2.0 – Full

Speed/12Mbps. The USB protocol Suspend, Resume and Reset operations are managed by this API.

The API includes:

• USB_Init() (page 43)

• USB_Status() (page 48)

• USB_Stall() (page 49)

• USB_UnStall() (page 49)

• USB_IN_1() (page 49)

• USB_IN_2() (page 50)

• USB_OUT_1() (page 50)

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Maxim-integrated 73S12xxF Software Manual do Utilizador Página 42