AM263P4: PLL/Clock XTALCLK_OSC Status

TollMan

Part Number: AM263P4

I am implementing a manufacturing test application.

If possible, I would like to read and report any status available concerning the crystal (XTALCLK_OSC), and the clocks generated by the PLL/Clocking.

For instance, SPRUJ55 Section 6.4 describes a Limp Mode “A dedicate coarse clock loss logic checks the XTAL clock against the RC CLK continuously to detect if the XTAL clock is toggling.”

However, I do not see any information in that section concerning registers that can be read.

SPRUJ55 section 6.4.5 Clocking Registers. Says: “For additional details related to device clocking registers, please refer to the Control - RCM Registers section.”

However, I do not see any information in that section that is related.

Please advise.

over 1 year ago

+1 Akshit Pareek over 1 year ago

TI__Expert 4230 points

Hi Scott,

CLKSRCSEL and CLKINUSE Registers can be checked to get the CLK source and status.

#include <stdio.h>
#include <kernel/dpl/DebugP.h>
#include <drivers/hw_include/cslr_soc.h>
#include <drivers/soc.h>
#include <drivers/soc/am263x/soc_rcm.c>

uint32_t base = CSL_TOP_RCM_U_BASE;

static inline void
App_readAndPrintRegValue()
{
    // clksrcsel
    uint32_t pllCoreClkSrcSel;
    pllCoreClkSrcSel = HW_RD_REG32(base + CSL_TOP_RCM_PLL_REF_CLK_SRC_SEL) & CSL_TOP_RCM_PLL_REF_CLK_SRC_SEL_PLL_CORE_REF_CLK_SRC_SEL_MASK;
    DebugP_log("CSL_TOP_RCM_PLL_REF_CLK_SRC_SEL: 0x%x\r\n", pllCoreClkSrcSel);

    // clkinuse
    uint32_t r5ssClkStatus;
    r5ssClkStatus = HW_RD_REG32(base + CSL_TOP_RCM_R5SS_CLK_STATUS) & CSL_TOP_RCM_R5SS_CLK_STATUS_CLKINUSE_MASK;
    DebugP_log("CSL_TOP_RCM_R5SS_CLK_STATUS: 0x%x\r\n", r5ssClkStatus);
}

For frequency

enum SOC_RcmPeripheralClockSource_e clkSrc = SOC_RcmPeripheralClockSource_XTALCLK;

uint32_t clkFreq = SOC_rcmGetPeripheralClockFrequency(clkSrc);

DebugP_log("Clock Frequency: %u\r\n", clkFreq);

You can also checkout .../mcu_plus_sdk/source/drivers/soc/am263x/soc_rcm.c and soc_rcm.h for more info,
and .../mcu_plus_sdk/source/drivers/hw_include/am263x/cslr_top_rcm.h for info on registers for clocks.

Regards,
Akshit

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AM263P4: PLL/Clock XTALCLK_OSC Status