Directed Electronics 3200HS Informacje Techniczne Pobierz pdf (Strona 33)

SCI to SPI Peripheral Communication in V850ES Microcontrollers

Figure 21. Temp_Read_2(): Read Temperature Sensor 2 (DS1722)

Delay 100ns after CS activeDelay 100ns after CS active

TEMP2_CS_ON (P9H.6 = 1)TEMP2_CS_ON (P9H.6 = 1)

CSI00_SendDone = FALSE

CALL CSI00_SendData(txbuf, 3)

CSI00_SendDone = FALSE

CALL CSI00_SendData(txbuf, 3)

CALL CSI00_ReceiveData(rxbuf, 3)CALL CSI00_ReceiveData(rxbuf, 3)

Yes

SendDone

== FALSE?

Yes

SendDone

== FALSE?

TEMP2_CS_OFF (P9H.6 = 0)TEMP2_CS_OFF (P9H.6 = 0)

Return retval

txbuf[0] = 0x01txbuf[0] = 0x01

CALL CSI00_SetType3( )CALL CSI00_SetType3( )

Retval = rxbuf[2] << 8

Retval = retval | rxbuf[1]

Retval = retval / 2

Retval = rxbuf[2] << 8

Retval = retval | rxbuf[1]

Retval = retval / 2

The routine then calls CSI00_ReceiveData(rxbuf, 3) to set the location and count of bytes to be

read from the CSI00 peripheral. The first parameter, rxbuf, is a pointer to an array of byte values

to hold the data read; the second parameter, 3, is the count of bytes to receive.

The routine then sets the first byte of a transmit buffer, txbuf[0], to the address of the temperature

low byte, 01H. The routine sets the CSI00_SendDone flag to FALSE, and starts the write of the

address plus two dummy bytes by calling CSI00_SendData(txbuf, 3). The Temp_Read_2() routine

then waits for the CSI00_SendDone flag to be set.

On the call to CSI00_SendData(txbuf, 3), the transfer is started by writing the first byte of data

(01H) to the SOTB0L register. This data will be sent out the SO00 output and received at the SDI

input of the DS1722.

After the first byte has been sent, the INTCSI00 interrupt will occur, and the MD_INTCSI00()

interrupt service routine will transmit the next byte from txbuf[1], and read the received data into

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 98 99

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Philips DC200/93 User Manual (2 pages)

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Philips DC200/93 User Manual (2 pages)

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