BS2p and MAX127 ADC

GeisteskrankerAlkoholiker

Hello. I like to connect my BS2p to a MAX127 12Bit ADC. My problem is how to write I2C command.

I need to initialize the device like:

START | SlaveAddr-Byte |A| Control-Byte |A| STOP

...to read the device:

START | SlaveAddr-Byte |A| Data-Byte (D11-D4) |A| Data-Byte (D3-D0 + 0000) |A| STOP


Is there anybody who can explain me how to write this program? Please!!!

Mike Green

Read the chapters in the Stamp Basic Syntax and Reference Manual on the I2C statements (I2CIN / I2COUT). These statements will take care of the start and stop transitions and the acknowledge bits. You only have to deal with the actual data bytes.

GeisteskrankerAlkoholiker

I read it already, but I don´t know how to do. Could u give me a hint? Please. I don´t want a complet program,just how to use this command.

I tried the 24C16 EEPROM program. That works fine, but this ADC don´t wanne communicate with my BS2p (Hardware is double-checkt).

Mike Green

I don't have my manual handy, but you would use the I2COUT and I2CIN·statements, something like
I2COUT <pin>,<slave address>,[noparse][[/noparse]<control byte>]
I2CIN <pin>,<slave address>,[noparse][[/noparse] dataByte1, dataByte2 ]

dataByte1 and dataByte2 are byte variables that store the received values.

I think <pin> is 0 or 8 since the SCL and SDA lines have to be connected to pins 0/1 or pins 8/9.

<slave address> is the device select value. The Stamp takes care of the input/output bit.

<control byte> is a control value or register number (depending on the device)

I may have some of this wrong, but you should be able to correct it with the manual chapter.
The Stamp does a write transfer first to send the control information. It then readdresses the
device for a read transfer for the information expected.