Re: [ts-7000] TS7260 UART: set baudrate up to 1Mbps

[Mike Ingle <>]

>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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