Hello,
I had a problem with interrupt handling with the 16550 core.
Presumably a programming error in the C code of the component:
The uart did not process receive interrupts properly from the start.
What follows is an exact copy of the nios code for the uart:
altera_16550_uart_init.c line 439:
/* enable interrupts at the device */
regs = iord_altera_16550_uart_ier(sp->base);
regs |= altera_16550_uart_ier_erbfi_msk | altera_16550_uart_ier_etbei_msk;
iowr_altera_16550_uart_ier(base, sp->ctrl); }
Should be:
altera_16550_uart_init.c line 439:
/* enable interrupts at the device */
sp->ctrl = iord_altera_16550_uart_ier(sp->base);
sp->ctrl |= altera_16550_uart_ier_erbfi_msk | altera_16550_uart_ier_etbei_msk;
iowr_altera_16550_uart_ier(base, sp->ctrl); }
=> reading the interrupt enable register, modifying the read contents and then writing the result back using a different value does not make sense.
Best Regards,
Johi.
