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Altera_Forum's avatar
Altera_Forum
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16 years ago

How to use FIFOed Avalon Uart under uClinux on DE2 2c35 Board?

Hi all,

I tried to use "altera uart" to exchange data between my de2 board and an PC but i failed.

Now i want to use "FIFOed Avalon Uart" for that purpose. However, I do not know how to implement "FIFOed Avalon Uart" under uclinux.

I have built the hardware following this instruction: http://www.nioswiki.com/exampledesigns/fifoed_avalon_uart and used this patch: http://www.alterauserforums.org/forum/showthread.php?t=18198

But the "dev/ttyS0" can not be created. :confused:

Can u guys plz tell me how to use "FIFOed Avalon Uart" under uClinux?

many thanks!

5 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    16 years ago

    AFAIK no software changes are necessary, as the interface of the FIFOed Uart is identical to that of the Altera UART. So just use the Altera UART driver.

    -Michael
  • Altera_Forum's avatar
    Altera_Forum
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    16 years ago

    hi Michael,

    thanks for replying!

    i have used FIFOed Avalon Uart without any software changes. I have enabled both Altera JTAG UART support and Altera Uart support. But uClinux still told me "/dev/ttyS0 can not create".

    I really do not understand why!!
  • Altera_Forum's avatar
    Altera_Forum
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    16 years ago

    The ip class name may be wrong, please update the script,

    nios2-linux/linux-2.6/arch/nios2/scripts/nios2.h/fifoed_avalon_uart.pm

    - Hippo
  • Altera_Forum's avatar
    Altera_Forum
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    16 years ago

    here the script of fifoed_avalon_uart. It seems that this script is not implemented 

    package fifoed_avalon_uart;
use base qw(BasicModule);
use strict;
sub required_module_names {
	("uart0", "uart1", "uart2", "uart3")
}
sub required_class_name {
        "fifoed_avalon_uart";
}
sub base_address_cast {
	"void "
}
sub translate {
	my $class = shift;
	my ($system, $required_module_name, $module_name) = @_;
	$class->SUPER::translate (@_);
        if (defined ($fifoed_avalon_uart::default_uart)) {
                print "/* The default uart is always the first one found in the PTF file */\n";
                print "#define nasys_printf_uart na_$required_module_name\n\n";
                $fifoed_avalon_uart::default_uart = $required_module_name;
        }
}
sub run {
        fifoed_avalon_uart->run2 (@_);
}
1;
  • Altera_Forum's avatar
    Altera_Forum
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    16 years ago

    thanks for ur time spent on this topic.

    I've solved this problem by naming fidoed uart as "uart0" in SOPC builder