DE2 115 : Trying to send/receive usb bulk data from ISP1362 to FTDI 232H chip

Hi,

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I'm trying to use the isp 1362(host mode) with nios2 to communicate with a FTDI 232H chip (bulk transfer mode supported only).

Everything is fine, i can get the descriptor of the FTDI chip and i'm connected in full speed mode .

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Then this means you have made good progress.Nice.

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There is a PTD.c file provided by Terasic with multiple methods to handle all 4 usb transfert modes which are :

-send_iso for isochronous

-send_int for interrupt

-send_control for control

-send_ptl (what is that?)

I just want to send a byte in bulk mode (ie 0xAA)

What is the right way to do this?

i would say i should make a ptd with "void make_ptd(int *rptr,char token,char ep,int max,char tog,char addr,char port)"

But what should i put in the rptr[4], rptr[5], rptr[6] and rptr[7]?

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Sorry but I don't have idea about this. Particularly I don't have file which you are referring. Hence don't know what is the use of rptr.

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Is there a special code to put next the ptd to do an OUT transfer like in Control transfer?

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No. But you should put Bulk OUT request after SET CONFIGURATION request. USB device responds to bulk out after its configuration is set by host using SET CONFIGURATION request. Have you performed this request? Do you have some reference available or are you trying to do this your own? Asking this to know whether you have just got device descriptor or have already enumerated device.

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Or should i just put the data after the ptd?

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Payload offset starts immediately after PTD offset according to ISP1362 datasheet. Are you asking this?

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Well i'm quite lost for now...

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Don't worry! Be happy. We will see if we can help you.

Hi Mr Bhaumik,

first of all, thanks for your reply, i appreciate.

I'm sorry i'm at home, so i don't have the files. I will put them on my next reply monday.

I refered to Terasic example "Nios Host mouse vga" to get the descriptor, via "get_control" "send_control" functions. I set an adress to the FTDI chip on the port on which it's connected. Is that you mean by "set configuration"?

As you said yes i tried to to put the payload just after the ptd.

I'm surprised because i can see that i got a response with a completion code of 0x0 which means transaction has been successful. But nothing happened on the Led i connected to FTDI out port. I precise that the ftdi works fine because i tested it with a computer.

I'll send you my code as soon as possible.

And thanks again.

Hi,

Here are few comments from my side:

(1) You seems to have performed SET ADDRESS request. This is different from SET CONFIGURATION request. As per my knowledge, host should access endpoints other than default control endpoint only after configuring device using SET CONFIGURATION. Anyway, in general basically atleast following requests are performed ( you might be able to find this in the example which you are using) :

1. GET DEVICE DESCRIPTOR with 0x8 bytes ( @ default address )

2. SET ADDRESS ( @ default address )

All requests after this will use new address

1. GET DEVICE DESCRIPTOR with 0x12 bytes

2. GET CONFIGURATION DESCRIPTOR with 0x9 bytes

3. GET CONFIGURATION DESCRIPTOR with full configuration descriptor length

4. SET CONFIGURATION

Now, in your case you can perform Bulk OUT request.

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I'm surprised because i can see that i got a response with a completion code of 0x0 which means transaction has been successful. But nothing happened on the Led i connected to FTDI out port.

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This would be interesting to see why this is not working.

Please let me know if I am confusing at any point.

Regards,

Bhaumik

Hi again,

i'm now reading chapter 9 of usb 2 manual to understand what i'm doing...

here are the arrays you need to put after a setup ptd to get descriptors

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unsigned int get_control(unsigned int *rptr,unsigned int addr,char control_type,unsigned int extra,int port)

{

unsigned int cbuf[128];

unsigned int rbuf[128];

unsigned int cnt=0,lcnt=0;

unsigned int toggle_cnt=0;

unsigned int word_size;

unsigned int DesSize,MaxSize;

unsigned int dev_req[4]={0x0680,0x0100 ,0x0000,0x8};

unsigned int cfg_req[4]={0x0680,0x0200 ,0x0000,0x8};

unsigned int str_req[4]={0x0680,0x0300 ,0x0000,0x8};

unsigned int int_req[4]={0x0680,0x0400 ,0x0000,0x8};

unsigned int end_req[4]={0x0680,0x0500 ,0x0000,0x8};

unsigned int hid_req[4]={0x0681,0x2100 ,0x0000,0x8};

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As you can see, it's a bit confusing cause offsets here are not the same as it's shown in the manual. It's irritating :/

0x06 = bRequest field => type of request (get_descriptor here)

0x08 = bmRequestType

0x0100 = descriptorType = device

etc..

i'm just wondering why you put 0x12 bytes in get device descriptor after setting the address and 0x9 for get config descriptor.

arrrgh this thing makes me mad..

Pci express was almost easier for me... or i'm not normal

Hello,

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As you can see, it's a bit confusing cause offsets here are not the same as it's shown in the manual. It's irritating :/

0x06 = bRequest field => type of request (get_descriptor here)

0x08 = bmRequestType

0x0100 = descriptorType = device

etc..

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Hope following will help to clear your doubt.

unsigned int dev_req[4]={0x0680,0x0100 ,0x0000,0x8};

dev_req[0] = 0x0680 ( Lower byte is 0x80 which is bmRequestType, Higher byte is 0x06 which is bRequest )

dev_req[1] = 0x0100 ( This 2 bytes are for wValue. Lower byte is 0x00 and upper byte is 0x01 which indicates Device descriptor.)

dev_req[2] = 0x0000 ( This 2 bytes are for wIndex. For device descriptor this field is 0.)

dev_req[3] = 0x0008 ( This 2 bytes are for wLength. This is 8 means we are expecting device to send 8 bytes in response to this request.)

Reference: 9.4.3 Get Descriptor and Table 9-2 from USB2.0 Specification

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i'm just wondering why you put 0x12 bytes in get device descriptor after setting the address and 0x9 for get config descriptor.

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I think, at present, you do not need to worry about this. I will answer later on.

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arrrgh this thing makes me mad..

Pci express was almost easier for me... or i'm not normal

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Hey brother, you are absolutely normal. PCI express may be simpler, but USB is also not that much difficult. At initial stage, it seems difficult but then you will love it.

Could you share code which you used to perform Bulk Request? I would like to check whether you are using correct endpoint number and device address.

Have a Nice day.

Regards,

Bhaumik

oups sorry i forgot the code, but i'm sure i'm setting address 2 on port 2 (after get descriptor config) and 0 for endpoint (but i don't know how to check if it's good or not). I will give you what i wrote as soon as i'll get in front on my screens tomorrow.

cheers.

hi,

how are you today?

here is the file, the main program is "main_prog_BULK_transfer" (at the end) + USB.c with "send_bulk" method i'm trying to do.

There is a screenshot of what i receive in debug console.

I'm just trying things so don't pay attention to the mess :oops:

Hi again Bhaumik,

it looks like it's working now. I send the byte to the led with bulk data out to endpoint number 2 (i tried 1 & 2, 0 is for control). I don't know how to get a list of that.

But i have some questions fo you:

-Why do i receive nothing when i ask a get_configuration? (get_config[] = {0x0880, 0,0,1};)

-How can I know the endpoint number where i should send data? In the demo program, with interrupt mode for mouse, it's shown it receive data from endpoint 1, what the hell? looks like arbitrary for me.

Hi,

I am sorry. I am busy with some other work and have not looked at your code yet. But glad to hear that you made progress.

Here are quick answers to your questions.

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-Why do i receive nothing when i ask a get_configuration? (get_config[] = {0x0880, 0,0,1};)

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You should be getting one byte but its value will be zero. You are interested in Endpoint descriptor. Hence you should perform GET_DESCRIPTOR ( with descriptor type = Configuration ). Please observe difference between GET_CONFIGURATION request and GET_DESCRIPTOR ( with descriptor type = configuration.)

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-How can I know the endpoint number where i should send data? In the demo program, with interrupt mode for mouse, it's shown it receive data from endpoint 1, what the hell? looks like arbitrary for me.

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From previous posts, it seems you are thinking in correct direction. To get list of available endpoints you need to perform GET_DESCRIPTOR ( descriptor type= configuration ).

I will try to elaborate these tonight if I get chance.

Kind Regards,

Bhaumik