Write in I/O ports

[Altera_Forum]

Hello, I want to write from my aplication in eCos only a bit, or led in the I/O ports in Nios II for mesure the timing latency. Can someone help me please? I don't know do this, and I don't find any documentation about. 

 Thanks, Guillem

[Altera_Forum]

For my test I use : 

# include <cyg/hal/io.h>  unsigned char ledpio;   myfunct() {  IOWR(LED_PIO_BASE,0, 1); // 1 for bit 0 .................  IOWR(LED_PIO_BASE,0, 0); // or  ledpio = ledpio|4; // 4 for bit 2  IOWR_8DIRECT(LED_PIO_BASE , 0, ledpio); ..............  ledpio = ledpio&~4;   IOWR_8DIRECT(LED_PIO_BASE , 0, ledpio); }  LED_PIO_BASE is defined in cyg/hal/system.h for my project