RE: [microblaze-uclinux] UART problem

[Sergi Gómez <SGomez@xxxxxxxx>]

Hi,

I already solved the baud rate problem on UART 3, which worked at 5800bauds. It's a configuration problem on HW definition. I have the PLV4.6 bus working at 62.5MHz, but in the PLV4.6 bus clock configuration on UART3 I had 100MHz instead 62.5MHz. That's why the UART was making a wrong frequency calculation.

Thank you

Sergi Gómez
ENGEL AXIL S.L.
Telf: +34 93 719 18 11
e-mail : sgomez@xxxxxxxx
Skype: engelaxil-sergigomez
Web: www.engel.es


-----Mensaje original-----
De: owner-microblaze-uclinux@xxxxxxxxxxxxxxxxxxxx [mailto:owner-microblaze-uclinux@xxxxxxxxxxxxxxxxxxxx] En nombre de Ayre, Aditya
Enviado el: martes, 08 de septiembre de 2009 6:39
Para: microblaze-uclinux@xxxxxxxxxxxxxx
Asunto: RE: [microblaze-uclinux] UART problem

If I had same problem, then I'd check following:
 
1. platgen warnings related to your uartlite instances 
(esp for clock period)

2. whether 'clock connection to uartlite is proper'

3. and if, things not nice with other uarts too, then 
Check on-board/fpga-dcm clocks

Hope this helps

-aditya
 


________________________________

	From: owner-microblaze-uclinux@xxxxxxxxxxxxxxxxxxxx [mailto:owner-microblaze-uclinux@xxxxxxxxxxxxxxxxxxxx] On Behalf Of Rod Campbell
	Sent: Monday, September 07, 2009 11:04 PM
	To: microblaze-uclinux@xxxxxxxxxxxxxx
	Subject: Re: [microblaze-uclinux] UART problem
	
	
	Hi,
	 I believe the uartlite has a hardwired baudrate.  If you want to have the flexibility of changing parms dynamically (like baudrate), I think you need to use a different Xilinx uart module.  I recall that they do have others available, but they use more FPGA resources, naturally. 
	
	I have no idea why you are getting a non-standard baudrate of 5800 (maybe you mean 4800 - still no idea)?
	
	Rod Campbell
	
	Sergi Gómez wrote: 

				Hello,
		 
		I'm using a Xilinx Spartan 3 DSP1800A development board with a microblaze and petalinux distribution. I set up 3 UartLites (from Xilinx IP core) to control 2 external HW peripherals and 1 console for monitor.
		I generate the petalinux 0.4-rc3 and booted the board with it. 
		But I have problems with uarts. I configured all 3 uarts with 9600bauds, 8-N-1. First problem is that even all 3 uarts are configured with same parameters (but different output pins), 2 of them are working perfectly and the 3rd is working at 5800bauds instead 9600. It's not problem defining the pins since I change them and always is failing the same Uart, not the same pins.
		Second problem is that I can't change the baudrate from my SW. I configure the port to 115200 dinamically, and it works always at 9600 instead. Any configuration I set up is not applied and port works permanently to 9600, 8-N-1.
		 
		I would appreciate any help
		 
		Thank you
		 
				Sergi Gómez
		ENGEL AXIL S.L.
		Telf: +34 93 719 18 11
		e-mail : sgomez@xxxxxxxx <mailto:sgomez@xxxxxxxx> 
		Skype: engelaxil-sergigomez
		Web: www.engel.es <http://www.engel.es> 
		 
		 
		


___________________________
microblaze-uclinux mailing list
microblaze-uclinux@xxxxxxxxxxxxxx
Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
Mailing List Archive : http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/


___________________________
microblaze-uclinux mailing list
microblaze-uclinux@xxxxxxxxxxxxxx
Project Home Page : http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
Mailing List Archive : http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/