Forum Discussion
Honored Contributor60 Uart's ?
I want to realize 60 Uart's on NIOS2 cpu
I can add 60 in SOPC builder only 32 IRQ can be assingd What happen whit these other UART that have no IRQ? Can someone tell that? And how can i fix this problem? I am using uClinux.10 Replies
Altera_ForumHi,
You can connect 32 of these irq signals to a PIO. Let the PIO generate an interrupt. And in the interrupt routine, read the pio to look what UART triggered it. If you do 2 of them, you can process 64 interrupts with 2 pins. You can do a bit better by making a user peripheral with 60 inputs for the IRQ's and one output to interrupt the processor. Reading from the custom hardware can give you directly the number of the uart that you want to process first (if you do some priority encoding). Stefaan.- Altera_Forum
uClinux only supports up to 4 altera_avalon_uarts... you'll need to mod the driver in order to support up to 60...
- Altera_Forum
I don't know anything about the uClinux driver -- but in general there is no requirement to have a UART that has an IRQ; its up to how your software is archictected. If your s/w driver polls the UART rather than relying on interrupts, you can just not connect the IRQ in SOPC Builder (specify "NC" instead of an integer in the IRQ field)..
- Altera_Forum
Hello,
just out of curiosity, what application needs 60 UARTs http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/biggrin.gif Dirk - Altera_Forum
Hi all!
<div class='quotetop'>QUOTE </div> --- Quote Start --- just out of curiosity, what application needs 60 UARTs[/b] --- Quote End --- Maybe a Christmas Tree... http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/biggrin.gif Bye! - Altera_Forum
I remember that someone designed in a Nios I a few years ago because they wanted to use an outragous number of UARTs and no other controller/processor offered it... I can't remember what the application was, but hey, that's the beauty of programmable logic.
- Altera_Forum
So i make a interrupt controller as a peripheral and connect all the IRQ from de UART's to this controller and then the controller have one IRQ to de CPU.
De peripheral generate a intterupt and tell witch UART gives a intterupt. Is it easy to mod de uClinux 4 altera_avalon_uarts driver ? - Altera_Forum
60 - RS232 UARTs? haha that's a lot of noise! lol
(sorry couldn't resist) - Altera_Forum
Jes lol, but 40 is also ok!
So can somone help me to mod de driver ? http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/cool.gif - Altera_Forum
<div class='quotetop'>QUOTE </div>
--- Quote Start --- Is it easy to mod de uClinux 4 altera_avalon_uarts driver ?[/b] --- Quote End --- very easy to mod the Linux driver to support more. All you need is to instantiate more Nios_serial structure. In the file drivers/serial/NIOSserial.c:
You can add more, or change to dynamically allocate and initialize this array. Maybe you also need minor change to the interrupt service routine since you have shared interrupts. Wentao Microtronixstatic struct NIOS_serial nios_soft = { // { 0,0,1,0,0,0,0, (nasys_printf_uart), (nasys_printf_uart_irq) }, /* ttyS0 */ { 0,0,1,0,0,0,0, (int) (na_uart0), (na_uart0_irq) }, /* ttyS0 */# ifdef na_uart1 // { 0,0,0,0,0,0,0, (nasys_gdb_uart), (nasys_gdb_uart_irq) }, /* ttyS1 */ { 0,0,0,0,0,0,0, (int) (na_uart1), (na_uart1_irq) }, /* ttyS1 */# endif# ifdef na_uart2 { 0,0,0,0,0,0,0, (int) (na_uart2), (na_uart2_irq) }, /* ttyS2 */# endif# ifdef na_uart3 { 0,0,0,0,0,0,0, (int) (na_uart3), (na_uart3_irq) }, /* ttyS3 */# endif };
