Technical information

CSI to SPI Peripheral Communication in V850ES Microcontrollers

CSI00_SetType3(); /* set CSI00 interface for Type 3

transfer */

TEMP2_CS_ON; /* select chip to enable

reading */

/* delay 400ns between CS true and SCK rise */

/* one NOP takes 50ns at 20MHz, so do eight */

__asm("nop"); __asm("nop");

CSI00_ReceiveData(rxbuf, 3); /* set up to receive three bytes (first

is dummy) */

txbuf[0] = 0x01; /* set address to read temperature

low byte */

CSI00_SendDone = MD_FALSE; /* set flag false - will be wset

true by INTCSI00 */

CSI00_SendData(txbuf, 3); /* transmit address to start

transfer (number to receive) */

while (CSI00_SendDone == MD_FALSE)

; /* wait for CSI transfer done */

TEMP2_CS_OFF; /* deselect chip to allow conversion to start again

/* received data is now in rxbuf 1 and 2, with low byte, MSB first, in

rxbuf[1] */

/* and high byte in rxbuf[2] */

retval = (rxbuf[2] << 8) | rxbuf[1]; /* get 16-bit signed

temperature * 256 */

retval = retval / 2; /* scale down to

temperature * 128 for compatibility */

return (retval);

#endif

}

/* routine to delay for 500 msec */

void Temp_Delay_500ms(void)

{

SetMsecTimer(500); /* set timer for 500 milliseconds

while (!CheckMsecTimer())

; /* wait for timer done */

}

**---------------------------------------------------------------------------

** Abstract:

** Function to do display of temperature value

** Parameters:

** short temp - 16-bit signed temperature value (temperature * 128)

** Returns: None