Program LMK&LMX on RFSoC4x2 from Vitis(No PYNQ)

Support
14

Summary for baremetal LMK&LMX program.

  1. LMK should be initialize manually by GPIOs before writing registers.
        XGpioPs Gpio;
        XGpioPs_Config *GpioConfigPtr;
        GpioConfigPtr = XGpioPs_LookupConfig(XPAR_GPIO_BASEADDR);
        XGpioPs_CfgInitialize(&Gpio, GpioConfigPtr,
				       GpioConfigPtr->BaseAddr);
        XGpioPs_SetDirectionPin(&Gpio, MIO_LMK_RST, 1);
	    XGpioPs_SetOutputEnablePin(&Gpio, MIO_LMK_RST, 1);
	    XGpioPs_WritePin(&Gpio, MIO_LMK_RST, 1);//lmk_reset.write(1)
        XGpioPs_WritePin(&Gpio, MIO_LMK_RST, 0);//lmk_reset.write(0)

        XGpioPs_SetDirectionPin(&Gpio, MIO_LMK_CLK_IN_SEL0, 1);
	    XGpioPs_SetOutputEnablePin(&Gpio, MIO_LMK_CLK_IN_SEL0, 1);
        XGpioPs_WritePin(&Gpio, MIO_LMK_CLK_IN_SEL0, 0);//lmk_clk_sel0.write(0)
        
        XGpioPs_SetDirectionPin(&Gpio, MIO_LMK_CLK_IN_SEL1, 1);
	    XGpioPs_SetOutputEnablePin(&Gpio, MIO_LMK_CLK_IN_SEL1, 1);
        XGpioPs_WritePin(&Gpio, MIO_LMK_CLK_IN_SEL1, 0);//lmk_clk_sel1.write(0)
  1. LMXs should be reset first, by writing reset values to register.
        u32 reset = 0x020000;//write reset
        TempBuffer[2] = reset & 0xFF;
        TempBuffer[1] = (reset>>8) & 0xFF;
        TempBuffer[0] = (reset>>16) & 0xFF;
        
        XSpiPs_SetSlaveSelect(SpiInstancePtr, slave_select);
        Status = XSpiPs_PolledTransfer(SpiInstancePtr, TempBuffer, 
        NULL, 3);

        reset = 0x000000;//remove reset
        TempBuffer[2] = reset & 0xFF;
        TempBuffer[1] = (reset>>8) & 0xFF;
        TempBuffer[0] = (reset>>16) & 0xFF;
        
        Status = XSpiPs_PolledTransfer(SpiInstancePtr, TempBuffer, 
        NULL, 3);
  1. Register values should be configured very carefully through TICS pro.
    I used PYNQ official register values, but it won’t work for PLL1 of LMK, it will not lock. Howerer, after I changed some settings for PLL1, it locked successfully.
    Download register values from here, then load it in TICS, and change value of ‘Phase Dector Fre’, ‘PLL1 R Dividers’ and ‘N divider’ for PLL1 as shown in the figure. After that, export and use the HEX values.
    image
    image1073×751 126 KB

If you want to build a baremetal project, code and register values for clk congifure is in the attached C code as a reference.
LMK_LMX.c (11.0 KB)