Using a uart without HAL

Hi,

The HAL functions works with UART register, so if in one side you use them to read or write, and on another side you access directly the UART register, this may result in conflict, particularly with interrupts.

To access directly the registers of UART, you don't have to disable anything about HAL, just use the macro defined in the file altera_avalon_uart_regs.h. (cf Nios II Software Developer’s Handbook, Chapter 7, part Accessing Hardware, for the use of IORD and IOWR macros).

So, to write or read data, you simply have to do the following :

IOWR_ALTERA_AVALON_UART_TXDATA(UART_BASE, data);

data = IORD_ALTERA_AVALON_UART_RXDATA(UART_BASE);

Jérôme