Altera PLL Reconfig + Attera PLL = don't work

Altera_Forum · ‎12-18-2014

Hello all. I use Quartus 13.1. And DE1-SoC board with 5CSEMA5F31C6N.

I need to dynamicly phase shift output clocks from PLL so, I make Qsys system with Altera PLL Reconfig and Altera PLL, and some PIO.

I generate system and write code in Eclipse for NiosII, but phases don't shift, and reading from Altera PLL Reconfig registers don't work.

I don't know where i'am make a mistake...

P.S. Altera PLL - Enable dynamic reconfiguration of PLL is on

P.S. clk_0 = 50MHz


# include "system.h"# include "alt_types.h"# include "io.h"
//#include "define.h"
# define MODE_REG       0x00
# define STATUS_REG     0x04
//#define STATUS_REG     0x01
# define START_REG      0x08
//#define START_REG      0x02
# define DPS_REG     0x18
//#define DPS_REG     0x06
# define KEY0 0# define KEY1 1# define KEY2 2# define KEY3 3
# define LED9 3# define LED8 2# define LED7 1# define LED6 0
volatile alt_u32 tmp_data = 0;
int main(void)
{
alt_u32 pio_reg = 0;
alt_u32 button = 0;
alt_u32 status = 0;
alt_u8 button_pressed=0;
alt_u8 phase_shift=0;
while(1){
//test
    pio_reg |= (1<<LED6);
    IOWR_32DIRECT(PIO_LEDS_BASE,0,pio_reg);
    button = IORD_32DIRECT(PIO_BUTTONS_BASE,0);
    if (~(button) & (1<<KEY0)) {    //pressed
        pio_reg |= (1<<LED7);
        IOWR_32DIRECT(PIO_LEDS_BASE,0,pio_reg);
        if (phase_shift != 1)  { //doing phsft
            phase_shift = 1;
            IOWR_32DIRECT(PLL_RECONFIG_BASE,MODE_REG,0x1);
            IOWR_32DIRECT(PLL_RECONFIG_BASE,DPS_REG,0b1000010000000000001000);//positive shift c1 = 8 shifts
            IOWR_32DIRECT(PLL_RECONFIG_BASE,START_REG,0x1);
            tmp_data = IORD_32DIRECT(PLL_RECONFIG_BASE,0x0C); // tpm_data = 0 here
            tmp_data++;                                                             // tmp_data = 1 here
            do {
                status = IORD_32DIRECT(PLL_RECONFIG_BASE,STATUS_REG);//read status
                pio_reg |= (1<<LED9);
                IOWR_32DIRECT(PIO_LEDS_BASE,0,pio_reg);
            }while(status != 0x01);
            pio_reg &= ~(1<<LED9);
            IOWR_32DIRECT(PIO_LEDS_BASE,0,pio_reg);
        }
    } else {
        pio_reg &= ~(1<<LED7);
        IOWR_32DIRECT(PIO_LEDS_BASE,0,pio_reg);
        phase_shift = 0;
    }
}
}

Altera_Forum · ‎12-18-2014

I have had problems in the past with using the pll reconfig megafunction in qsys, perhaps try instantiating it outside qsys and exporting the signals from the pll megafunction and connecting it externally.