Hi Thomas,
The Olimex ARM-USB-OCD JTAG documentation says it is an FT2232L chip, but
libftdi recognizes it as a FT2232C (printing ftdi->type displays 2).
The patch runs fine for me.
Cheers,
Pierre
Le 16 mai 2014 à 17:19, Thomas Jarosch a écrit :
> Hi Pierre,
>
> On Sunday, 4. May 2014 18:51:45 Pierre Molinaro wrote:
>> I use libftdi 1-1.1 (last release) with interface B of an Olimex
>> ARM-USB-OCD JTAG. All is working fine, but change baud rate.
>> ftdi_set_baudrate () does not fail, it returns 0, but has no effect on
>> baud rate.
>>
>> I have found this message in libftdi archives :
>>
>> http://developer.intra2net.com/mailarchive/html/libftdi/2013/msg00207.htm
>> l
>>
>> It suggested the following change in ftdi_convert_baudrate () function:
>> ------
>> if (ftdi->type == TYPE_2232H ||
>> ftdi->type == TYPE_4232H ||
>> ftdi->type == TYPE_232H )
>> {
>> *index = (unsigned short)(encoded_divisor >> 8);
>> }
>> else
>> {
>> *index = (unsigned short)(encoded_divisor >> 16);
>> }
>> *index &= 0xFF00;
>> *index |= ftdi->index;
>
> hmm, I prefer not touching this in a too generic way
> since I don't have AM type chips around to test it.
>
> What chip is used on your ARM-USB-OCD JTAG interface? FT2232C?
> May be we can narrow down what's happening.
>
> Does this code change work for you:
>
> $ git diff
> diff --git a/src/ftdi.c b/src/ftdi.c
> index b6caf6c..3e2ebfd 100644
> --- a/src/ftdi.c
> +++ b/src/ftdi.c
> @@ -1200,7 +1200,7 @@ static int ftdi_convert_baudrate(int baudrate, struct
> ftdi_context *ftdi,
> }
> // Split into "value" and "index" values
> *value = (unsigned short)(encoded_divisor & 0xFFFF);
> - if (ftdi->type == TYPE_2232H || ftdi->type == TYPE_4232H || ftdi->type
> == TYPE_232H)
> + if (ftdi->type == TYPE_2232C || ftdi->type == TYPE_2232H || ftdi->type
> == TYPE_4232H || ftdi->type == TYPE_232H)
> {
> *index = (unsigned short)(encoded_divisor >> 8);
> *index &= 0xFF00;
>
>
> ?
>
> Cheers,
> Thomas
>
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