Hi Mike,
so are you saying it is the 7.3Mhz uart clock that limits the uart baudrate?
After reading the EP93XX Manual I encountered the following:
"UART2 contains an IrDA encoder operating at either
the slow (up to 115 Kbps), medium (0.576 or 1.152
Mbps), or fast (4 Mbps) IR data rates. It also has a 16
byte FIFO for receive and a 16 byte FIFO for transmit.
Note: USBm[1] and USBp[1] are not bonded out.
USBm[2,0] USB Negative Signals "
I assume UART1 is for COM1 and UART2 is for COM2, I am really confused of that
paragraph then.......
what do you think of getting a USB to serial board:
http://www.sparkfun.com/commerce/product_info.php?products_id=718
--- In Mike Ingle <> wrote:
>
> From ep93xx user manual:
> As another example, assume 230,400 baud (the maximum with a UARTCLK equal to
> 7.3728 Mhz), 5-bit characters, no parity, one stop bit, and no space between
> characters. There are 7 bits per character, so 230,400 / 7 = 32,914
> characters per second. Simultaneous transmitting and receiving implies 65,829
> characters per second. Using the DMA interface would result in 16,457 AHB
> accesses per second, while using the APB to access the UART leads to 65,829
> bus accesses per second.
>
> From the schematic, one can see that the xtal is 14.74Mhz my guess w/out
> looking deeper is that this does result in a 7.37Mhz uart clock. Thus you
> are limited to 230kbps from the ep9302 uart
>
> Mike
> On Feb 14, 2010, at 2:04 PM, tsao.terence wrote:
>
> > Hi,
> >
> > I have a 2.4Ghz radio card that supports up to 1Mbps transfer rate with
> > uart interface. Therefore I am trying to hack the TS7260 uart to have the
> > baudrate of 1000000. The only reason they quote maximum baudrate is only
> > 230K is because the limitation of the RS232 chip on board.
> >
> > Therefore I will like to bypass the RS232 level, but I don't know if you
> > can actually do that.
> >
> > 1.) Can I set the uart to a different set of pins therefore it doesn't go
> > though the RS232 chip and it won't have baud rate limitation issue?
> >
> > 2.) Get a USB to serial converter, but I don't really like that idea, I
> > want to use just the board itself.
> >
> > 3.) What else can I do to upscale the baudrate to 1000000 without having to
> > distort the signal.
> >
> > Remember I want UART not RS232
> >
> > Thanks
> >
> >
>
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