In SX Microcontrollers, SX/B Compiler and SX-Key Tool, mike.blankenship wrote:

I am having trouble setting up the registers for this A/D using the SHIFTOUT Command. 

I am using the following Basic Setup flow on Page 29 of the DataSheet :

[url=http://datasheets.maxim-ic.com/en/ds/MAX1415-MAX1416.pdf]http://datasheets.maxim-ic.com/en/ds/MAX1415-MAX1416.pdf[/url]

 

The Datasheet specifies MSBFIRST and the allowable Clkin Freq is 400KHz to 2.5Mhz so I

setup the "SpeedMulti" constant to 10 (10x83Khz = 830 Khz)

 

I am thinking its the way Im sending the data to the SPI interface because

I cannot get the /DRDY (Data Ready) pin to go LOW. 

 

Has anyone used this 16Bit A/D before with the SX? Any help is appreciated.

 

Below is a sample of my code.

 

Thanks

 

 

 

DEVICE   SX28, OSCHS3, TURBO, STACKX, OPTIONX
FREQ   50_000_000


Dout    PIN  RB.0 OUTPUT           ' Data TO MAX1416 (DIN) Pin 14
Cpin    PIN  RB.2 OUTPUT            ' SCLK to MAX1416 (SCLK)Pin 1
Din     PIN RB.1 INPUT                   ' Data from MAX1416 (DOUT) Pin 13

 

TX       Pin     RA.0 output ' Serial to PC


Baud  CON "T9600"  ' BAUD for PC


ComRegWRClk     CON %00100000                    '$20  ' CH1 ; Set Operation WR to Clock REG
ClkRegWR           CON %10100101                    '$A5  ' INTCLK Frq 2.4576Mhz ; 60HZ Update
ComRegWRSetup  CON %00010000                     '$10 ' Set Operation WR to Setup REG
ComWRSetup       CON %01000100                     '$44 ' SelfCal ; Gain 0 ; UniPolar ; NoBuf ; Beg SelfCal Clear FSYNC
ComWRComReg     CON %1000                           '$08 ' Set Operation Read from ComReg to see if DATA is ready!

 

DataVar               VAR Byte                             'VAR for ShiftOutIn Command

TX_BYTE SUB 1


PROGRAM Start
Start:

Main:
pause 1000

SHIFTOUT Dout, Cpin, MSBFIRST,  ComRegWRClk,10
SHIFTOUT Dout, Cpin, MSBFIRST,  ClkRegWR,10
SHIFTOUT Dout, Cpin, MSBFIRST,  ComRegWRSetup,10
SHIFTOUT Dout, Cpin, MSBFIRST,  ComWRSetup,10
SHIFTOUT Dout, Cpin, MSBFIRST,  ComWRComReg,10
SHIFTIN Din, Cpin, MSBPOST, DataVar,10

'TX_BYTE DataVar
SEROUT TX, Baud, DataVar
SEROUT TX, Baud, "M"

 


goto Main

 


SUB TX_BYTE
  SEROUT TX, Baud, __PARAM1
ENDSUB

 

 

 

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