I need help with FTDI's FTCSPI Library
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From: ghelbig on 15 Apr 2008 19:39 Hi, I'm trying to use the GPI calls in FTDI's FTCSPI library, and I can't seem to make it work. My biggest headache is that I can't find any documentation on the following: -------------------------- FTC_STATUS Status = FTC_SUCCESS; FTC_HANDLE ftHandle; FTC_CHIP_SELECT_PINS ChipSelectsDisableStates; FTC_INPUT_OUTPUT_PINS HighInputOutputPins; // Set chip select pin states (ADBUS3 - ADBUS7) ChipSelectsDisableStates.bADBUS3ChipSelectPinState = false; ChipSelectsDisableStates.bADBUS4GPIOL1PinState = false; ChipSelectsDisableStates.bADBUS5GPIOL2PinState = false; ChipSelectsDisableStates.bADBUS6GPIOL3PinState = false; ChipSelectsDisableStates.bADBUS7GPIOL4PinState = false; // Set GPIO pin states (ACBUS0 - ACBUS3) HighInputOutputPins.bPin1InputOutputState = true; HighInputOutputPins.bPin1LowHighState = false; HighInputOutputPins.bPin2InputOutputState = true; HighInputOutputPins.bPin2LowHighState = false; HighInputOutputPins.bPin3InputOutputState = true; HighInputOutputPins.bPin3LowHighState = false; HighInputOutputPins.bPin4InputOutputState = true; HighInputOutputPins.bPin4LowHighState = false; Status = SPI_SetGPIOs(ftHandle, &ChipSelectsDisableStates, &HighInputOutputPins); -------------------------- What I can't find is a definition of what these structure members do. For example, does setting ChipSelectDisableState to false mean that it is not disabled, AKA enabled? And if 'false' for InputOutput state mean input, or output? If someone could shed some light on this, or point me to some examples, I would appreciate it. TIA, G.
From: Paul Carpenter on 17 Apr 2008 06:01 <ghelbig(a)lycos.com> wrote in message news:8808e6ea-6018-4ac9-8061-5a672d0110a4(a)b5g2000pri.googlegroups.com... > Hi, > > I'm trying to use the GPI calls in FTDI's FTCSPI library, and I can't > seem to make it work. My biggest headache is that I can't find any > documentation on the following: By the looks of things you are rying to use a FT2232 device. I have a VB6 example up on my site (see sig). The code may help with getting flow sorted. > -------------------------- > FTC_STATUS Status = FTC_SUCCESS; > FTC_HANDLE ftHandle; > FTC_CHIP_SELECT_PINS ChipSelectsDisableStates; > FTC_INPUT_OUTPUT_PINS HighInputOutputPins; I don't understand your problem with the above definitions, as they are defined in the Appendix of FTDI SPI Programming Guide, which I believe you must have. > // Set chip select pin states (ADBUS3 - ADBUS7) > ChipSelectsDisableStates.bADBUS3ChipSelectPinState = false; > ChipSelectsDisableStates.bADBUS4GPIOL1PinState = false; > ChipSelectsDisableStates.bADBUS5GPIOL2PinState = false; > ChipSelectsDisableStates.bADBUS6GPIOL3PinState = false; > ChipSelectsDisableStates.bADBUS7GPIOL4PinState = false; > > // Set GPIO pin states (ACBUS0 - ACBUS3) > HighInputOutputPins.bPin1InputOutputState = true; > HighInputOutputPins.bPin1LowHighState = false; > HighInputOutputPins.bPin2InputOutputState = true; > HighInputOutputPins.bPin2LowHighState = false; > HighInputOutputPins.bPin3InputOutputState = true; > HighInputOutputPins.bPin3LowHighState = false; > HighInputOutputPins.bPin4InputOutputState = true; > HighInputOutputPins.bPin4LowHighState = false; > > Status = SPI_SetGPIOs(ftHandle, &ChipSelectsDisableStates, > &HighInputOutputPins); > -------------------------- > > What I can't find is a definition of what these structure members do. > For example, does setting ChipSelectDisableState to false mean that it > is not disabled, AKA enabled? And if 'false' for InputOutput state > mean input, or output? From memory, this sort of documentation is weak on FTDI software along with a few other aspects. They have a habit of putting UNDOCUMENTED examples in their guides assuming you know what everything means, without saying what the result is. I have not had to use the pin structures to get SPI working to 16 SPI devices. I would suggest trying a few combinations to see what setting one pin to all combinations does. > If someone could shed some light on this, or point me to some > examples, I would appreciate it. > > TIA, > G. > -- Paul Carpenter | paul(a)pcserviceselectronics.co.uk <http://www.pcserviceselectronics.co.uk/> PC Services <http://www.pcserviceselectronics.co.uk/fonts/> Timing Diagram Font <http://www.gnuh8.org.uk/> GNU H8 - compiler & Renesas H8/H8S/H8 Tiny <http://www.badweb.org.uk/> For those web sites you hate
From: ghelbig on 17 Apr 2008 13:24
On Apr 17, 3:01 am, "Paul Carpenter" <p...(a)pcserviceselectronics.co.uk> wrote: > <ghel...(a)lycos.com> wrote in message > > news:8808e6ea-6018-4ac9-8061-5a672d0110a4(a)b5g2000pri.googlegroups.com... > > > Hi, > > > I'm trying to use the GPI calls in FTDI's FTCSPI library, and I can't > > seem to make it work. My biggest headache is that I can't find any > > documentation on the following: > > By the looks of things you are rying to use a FT2232 device. > > I have a VB6 example up on my site (see sig). The code may help with > getting flow sorted. > > > -------------------------- > > FTC_STATUS Status = FTC_SUCCESS; > > FTC_HANDLE ftHandle; > > FTC_CHIP_SELECT_PINS ChipSelectsDisableStates; > > FTC_INPUT_OUTPUT_PINS HighInputOutputPins; > > I don't understand your problem with the above definitions, as they are > defined in the Appendix of FTDI SPI Programming Guide, which I believe > you must have. > > > > > // Set chip select pin states (ADBUS3 - ADBUS7) > > ChipSelectsDisableStates.bADBUS3ChipSelectPinState = false; > > ChipSelectsDisableStates.bADBUS4GPIOL1PinState = false; > > ChipSelectsDisableStates.bADBUS5GPIOL2PinState = false; > > ChipSelectsDisableStates.bADBUS6GPIOL3PinState = false; > > ChipSelectsDisableStates.bADBUS7GPIOL4PinState = false; > > > // Set GPIO pin states (ACBUS0 - ACBUS3) > > HighInputOutputPins.bPin1InputOutputState = true; > > HighInputOutputPins.bPin1LowHighState = false; > > HighInputOutputPins.bPin2InputOutputState = true; > > HighInputOutputPins.bPin2LowHighState = false; > > HighInputOutputPins.bPin3InputOutputState = true; > > HighInputOutputPins.bPin3LowHighState = false; > > HighInputOutputPins.bPin4InputOutputState = true; > > HighInputOutputPins.bPin4LowHighState = false; > > > Status = SPI_SetGPIOs(ftHandle, &ChipSelectsDisableStates, > > &HighInputOutputPins); > > -------------------------- > > > What I can't find is a definition of what these structure members do. > > For example, does setting ChipSelectDisableState to false mean that it > > is not disabled, AKA enabled? And if 'false' for InputOutput state > > mean input, or output? > > From memory, this sort of documentation is weak on FTDI software > along with a few other aspects. They have a habit of putting > UNDOCUMENTED examples in their guides assuming you know > what everything means, without saying what the result is. > > I have not had to use the pin structures to get SPI working to 16 SPI > devices. > > I would suggest trying a few combinations to see what setting > one pin to all combinations does. > > > If someone could shed some light on this, or point me to some > > examples, I would appreciate it. > > > TIA, > > G. > > -- > Paul Carpenter | p...(a)pcserviceselectronics.co.uk > <http://www.pcserviceselectronics.co.uk/> PC Services > <http://www.pcserviceselectronics.co.uk/fonts/> Timing Diagram Font > <http://www.gnuh8.org.uk/> GNU H8 - compiler & Renesas H8/H8S/H8 Tiny > <http://www.badweb.org.uk/> For those web sites you hate Paul, Yes, it's a 2232. I should have said so. I'm not having trouble with the SPI part. In my circuit, I need to wiggle some bits to enable the SPI on the slave device; that is what is not working. I have no problem with the structure definitions, but the member values are eluding me. Sigh. Yes, the undocumented example is more confusing than useful. And the function names in the examples (version 1.0) do not exactly match the function call names in the library (version 1.0). Double sigh. Right now it seems that the set_GPIOs call works only once per device open. The 1st call does something related to the structure elements, but subsequent calls do nothing until the device is closed and re- opened. Unfortunately, closing and re-opening sets the GPIOs to default, which wonks-up the sequence I need to do. I will take a look at your examples. Thanks! G. |