spi program of ftdi having doubt

[wild roze]

hi
i am trying to interface an ftdi 2232h to a pik kit via SPI . i downloaded some sample spi codes from the ftdi site. i didn't understand some portion of the
program . These are the codes


ChipSelectsDisableStates.bADBUS3ChipSelectPinState = false; // default is false This makes CS active high
ChipSelectsDisableStates.bADBUS4GPIOL1PinState = false;
ChipSelectsDisableStates.bADBUS5GPIOL2PinState = false;
ChipSelectsDisableStates.bADBUS6GPIOL3PinState = false;
ChipSelectsDisableStates.bADBUS7GPIOL4PinState = false;


HighInputOutputPins.bPin1InputOutputState = true;
HighInputOutputPins.bPin1LowHighState = false;
HighInputOutputPins.bPin2InputOutputState = true;
HighInputOutputPins.bPin2LowHighState = false;
HighInputOutputPins.bPin3InputOutputState = true;
HighInputOutputPins.bPin3LowHighState = false;
HighInputOutputPins.bPin4InputOutputState = true;
HighInputOutputPins.bPin4LowHighState = false;

HighInputOutputPins.bPin5InputOutputState = true;
HighInputOutputPins.bPin5LowHighState = false;
HighInputOutputPins.bPin6InputOutputState = true;
HighInputOutputPins.bPin6LowHighState = false;
HighInputOutputPins.bPin7InputOutputState = true;
HighInputOutputPins.bPin7LowHighState = false;
HighInputOutputPins.bPin8InputOutputState = true;
HighInputOutputPins.bPin8LowHighState = false;


why they configured these general purpose pins . i couldn't understand this . please reply if anybody knows this

 

[wp100]

Hi,

Are you saying you are connecting your Pic to the Ftdi then to the Pickit

If you got all that to work, what are you trying to ? - cannot see what it achieves, plus how do you know how to 'talk' to the PicKit ?

 

[wild roze]

sorry
i meant to say that i want to do a spi interface with my 25lc256(eeprom) using a ftdi 2232h . i was trying to do through the parallel ports of the ftdi (channel b) .

 

[bigdogguru]

Hi wild roze,

I have to ask. Did you finally get your FTDI 2232H Mini Module to function? Is this what you're attempting to implement a SPI interface with?

 

[wild roze]

hi guru
actually i was struggling with my module . i would like to interface the module with the microchip pic24 using spi now. i guess i will reach the target soon .

 

[bigdogguru]

Was the module damaged? Were you been able to use the UART to USB function of the FTDI 2232H?

 

[wild roze]

The thing is i couldn't write anything (device descriptors) to the eeprom of the module . I tried with the ftprog(utility) several times .The eeprom might have gone i believe. Then i decided to do the spi interface . There are parallel pins in the ftdi , through which we could do the spi interface . I downloaded some sample codes from their site and working on it....still.

 

[bigdogguru]

You may find this page of interest:

**broken link removed**

---------- Post added at 12:29 ---------- Previous post was at 12:26 ----------

Here's a previous thread discussing the topic:

FTDIchip's FT2232 USB to SPI converter

 

[wp100]

Hi,

You might find some of these code examples for the Pic24 of help.
Experimenter's page

 

[FvM]

The thing is i couldn't write anything (device descriptors) to the eeprom of the module . I tried with the ftprog(utility) several times .The eeprom might have gone i believe.

I rather doubt wrong usage of the tool.

 

[wild roze]

hi to all .... thanks for the reply .
They are recommending this tool (ftprog) to program the eeprom .

 

[bigdogguru]

Any luck with bit-banging SPI on the FT2232H?

 

[wild roze]

That i have to see....

 

[FvM]

They are recommending this tool (ftprog) to program the eeprom.

I've been using the older MProg tool (v3.5) up to now and never faced any difficulties. But I don't know, if FT2232H is still supported by it.

 

[wild roze]

i tried with mprog also ...it is not even detecting, showing device not found .