Suggestions on effectively learning NIOSII Soft programing

Hi,

Do you have any further update?

Yes, I am going through the book and wanting to try out the simpler examples before moving onto the SD card part.For now I am trying to get on the handle of the syntaxes.Thanks for your suggestion

I do have some other problem to an example code I found for displaying LCD characters. In a certain line in the example the following line was written:

IOWR_ALTERA_AVALON_PIO_DATA(LCD_BITBANG_BASE,0x00600|data);

The documentation didn't explain any thing for the above line.Is it doing an or operation among the hex datas?

Hi,

Do you have the full example code/ example design?

From my knowledge, the PIO macros are defined in "altera_avalon_pio_regs.h". The macro "IOWR_ALTERA_AVALON_PIO_DATA" writes the output port.

I meant the Bitwise Or operation.Here is the code:

#include "sys/alt_stdio.h"
#include "stdio.h"
#include "system.h"
#include "priv/alt_busy_sleep.h"
#include "altera_avalon_pio_regs.h"
#define LCD_BITBANG_BASE 0x11000

void SendCommand(alt_u8 cmd);
void SendData(alt_u8 data);
void SendMessage(char *msg);

int main()
{
SendCommand(0x0038);
SendCommand(0x0001);
SendCommand(0x0006);

SendMessage("IICT");
SendCommand(0x00C0);
SendMessage("FPGA");
SendCommand(0x000C);
return 0;
}

void SendCommand(alt_u8 cmd)
{
IOWR_ALTERA_AVALON_PIO_DATA(LCD_BITBANG_BASE,0x0400|cmd);
alt_busy_sleep(1000);
IOWR_ALTERA_AVALON_PIO_DATA(LCD_BITBANG_BASE,0x0000|cmd);
alt_busy_sleep(1000);
}
void SendData(alt_u8 data)
{
IOWR_ALTERA_AVALON_PIO_DATA(LCD_BITBANG_BASE,0x0600|data);
alt_busy_sleep(1000);
IOWR_ALTERA_AVALON_PIO_DATA(LCD_BITBANG_BASE,0x0200|data);
alt_busy_sleep(1000);
}
void SendMessage(char *msg)
{
while(*msg!=0)
{
SendData(*msg);
*msg++;
}
}

Also I saw some people using usleep instead of alt_busy_sleep.What are the comparative advantages of using one and the other?

I think I have managed to grasp it now, It's essentially adding the Enable bit and RS and RW with the bitwise OR Operation along with the commands and data

Hi,

The "alt_busy_sleep"; Microsecond delay routine which uses a calibrated busy loop to perform the delay. This is used to implement usleep for both uC/OS-II and the standalone HAL. I'll say it is quite common usage for Nios II designs.

Do you have any issues or have any other questions?

I have no other questions for now. I really appreciate your help

Hi,

Thanks for your update.

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