I am tring to set up a Maxim MAX519 DAC using SCL1, & SDA1 on an ARMmite PRO. I don't get an ACK(I2C_I21STAT = 0x08) from the hardware after I send a STA_ It might be a hardware problem, as this is all new hardware & software. Any comments on the code? Code in LPC210x.h "#define I2C_I2C1NSET (*(REG3...

I need to set the clock speed for SCL1 on my PRO board. I have a funtion call !2CSPEED(400), but I don't think that applies to SCL1, only SCL0. I need to duplicate the function for SCL1, but I can't find the Source code.

Which module defines I2CSPEED?

I need to set P(17) to SCL1, and P(18) to SDA1, then PINSEL1 to (PINSEL1 || 0x010100). I can't find where this is done.

Also, I probably need a new version of Libarm7 for the PRO. I still have the Armmite version.

I'm trying to send a byte to an 8 bit DAC on the I2C bus from a PRO. I need to use P1(17), and P1(18) as SDA & SCL. Can I use I2COUT as is or can I modify the Function to use those pins?

I'm trying to measure the Period of an external Interrupt. It occurs as often as 1 msec. I read T0_CR0 and reset T0_TCR on each occurance. T0_PR is set to 0.

I need to know the rate of PCLK on my PRO board to calibrate the measurement.

Chris,

Thanks!

I'll jumper P!(17) & P1(18) to IO(12) & IO(13). They are unused and will be tri-state. This way they will be available on the Prototype Shield thriugh the Header.

I have run into a problem. The I2C bus outputs are on PO(2), and PO(3). These are not available on the PRO or ARMmite boards.

The DAC that I have on order rquires SDA & SCL for the I2C data transfer.

The parts that I selected are from Mouser. I'll try Digikey next. I have purchased from both in the past. I will look for another DAC, because the Mouser unit is a Dual and priced at $3.73 ea for 1 to 25 units. In the Dual DAC setup each DAC uses a seperate External Reference, since there are two DA...

I'm looking at a Maxim MAX517ACPA DAC, and an NXP BUK75144-55A,127 for the MOSFET. I need through hole mounting for the DAC. I still need to identify a single supply Op Amp.

I was thinking along those lines. I'll ned an Op Amp that works on a single supply, and a way to mount & heat sink the FET, also a DIP or SIP DAC. I got my ARMmite board working. I cleaned the solder splashes and flux. I plan to use it to test my Interrupt Proceedure, but I'll do the job on the Pro ...