/** Initializes the QSPI for TLC549. */
public static void init() {
US.PUT2(SPCR1, 0x0); // disable QSPI
US.PUT1(PQSPAR, 0xB); // use PCS0, MOSI, MISO for QSPI //
US.PUT1(DDRQS, 0xE); // SCK, MOSI, PCS0 outputs; MISO is input
US.PUT2(PORTQS, 0xFF); // all Pins, in case QSPI disabled, are high
US.PUT2(SPCR0, 0xA028); // QSPI is master, 8 bits per transfer, inactive state of
// SCLK is LOW (CPOL=0), data captured on leading edge (CPHA=0), clock = 0.5 MHz
US.PUT2(SPCR2, 0x4000); // no interrupts, wraparound mode, NEWQP=0, ENDQP=0
US.PUT1(COMDRAM, 0x3E); // disable chip select after transfer, 8 bits, DT=1, DSCK=1, use PCS0
US.PUT2(SPCR1, 0xB816); // enable QSPI, 1.4usec delay from PCS to SCK,
// wait 17 usec for conversion after transfer
}
/**
* Reads a digitized analog input value.
*
* @return Input value (8bit, 0..255)
*/
public static short read() {
return US.GET2(RECRAM);
}