TMS320F28P650DH: How does SysConfig ClockTree view affect the EPWMCLKDIV setting

//#############################################################################
//
// FILE:   device.c
//
// TITLE:  Device setup for examples.
//
//#############################################################################
//
//
// 
// C2000Ware v5.04.00.00
//
// Copyright (C) 2024 Texas Instruments Incorporated - http://www.ti.com
//
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//
// Included Files
//
#include "device.h"
#include "driverlib.h"
#ifdef __cplusplus
using std::memcpy;
#endif
#ifdef CMDTOOL
#include "device_cmd.h"
#endif

//*****************************************************************************
//
// Function to initialize the device. Primarily initializes system control to a
// known state by disabling the watchdog, setting up the SYSCLKOUT frequency,
// and enabling the clocks to the peripherals.
//
// Note : In case XTAL is used as the PLL source, it is recommended to invoke
// the Device_verifyXTAL() before configuring PLL
//
//*****************************************************************************
void Device_init(void)
{
    //
    // Disable the watchdog
    //
    SysCtl_disableWatchdog();
#ifdef CMDTOOL
    CMD_init();
#endif

#ifdef _FLASH
#ifndef CMDTOOL
    //
    // Copy time critical code and flash setup code to RAM. This includes the
    // following functions: InitFlash();
    //
    // The RamfuncsLoadStart, RamfuncsLoadSize, and RamfuncsRunStart symbols
    // are created by the linker. Refer to the device .cmd file.
    //
    memcpy(&RamfuncsRunStart, &RamfuncsLoadStart, (size_t)&RamfuncsLoadSize);
#endif
    //
    // Call Flash Initialization to setup flash waitstates. This function must
    // reside in RAM.
    //
    Flash_initModule(FLASH0CTRL_BASE, FLASH0ECC_BASE, DEVICE_FLASH_WAITSTATES);
#endif

#ifdef CPU1

    //
    // Set up PLL control and clock dividers
    //
    SysCtl_setClock(DEVICE_SETCLOCK_CFG);

    //
    // Make sure the LSPCLK divider is set to the default (divide by 4)
    //
    SysCtl_setLowSpeedClock(SYSCTL_LSPCLK_PRESCALE_4);

    //
    // These asserts will check that the #defines for the clock rates in
    // device.h match the actual rates that have been configured. If they do
    // not match, check that the calculations of DEVICE_SYSCLK_FREQ and
    // DEVICE_LSPCLK_FREQ are accurate. Some examples will not perform as
    // expected if these are not correct.
    //
    ASSERT(SysCtl_getClock(DEVICE_OSCSRC_FREQ) == DEVICE_SYSCLK_FREQ);
    ASSERT(SysCtl_getLowSpeedClock(DEVICE_OSCSRC_FREQ) == DEVICE_LSPCLK_FREQ);

#ifndef _FLASH
    //
    // Call Device_cal function when run using debugger
    // This function is called as part of the Boot code. The function is called
    // in the Device_init function since during debug time resets, the boot code
    // will not be executed and the gel script will reinitialize all the
    // registers and the calibrated values will be lost.
	// Sysctl_deviceCal is a wrapper function for Device_Cal
    //
    SysCtl_deviceCal();
#endif

#endif

    //
    // Turn on all peripherals
    //
    Device_enableAllPeripherals();
}

#ifdef CPU1
//*****************************************************************************
//
// Function to boot CPU2
// Available bootmodes :
//      - BOOTMODE_BOOT_TO_FLASH_BANK0_SECTOR0
//      - BOOTMODE_BOOT_TO_FLASH_BANK0_SECTOR127_END
//      - BOOTMODE_BOOT_TO_FLASH_BANK1_SECTOR0
//      - BOOTMODE_BOOT_TO_FLASH_BANK2_SECTOR0
//      - BOOTMODE_BOOT_TO_FLASH_BANK3_SECTOR0
//      - BOOTMODE_BOOT_TO_FLASH_BANK4_SECTOR0
//      - BOOTMODE_BOOT_TO_FLASH_BANK4_SECTOR127_END
//      - BOOTMODE_BOOT_TO_SECURE_FLASH_BANK0_SECTOR0
//      - BOOTMODE_BOOT_TO_SECURE_FLASH_BANK1_SECTOR0
//      - BOOTMODE_BOOT_TO_SECURE_FLASH_BANK2_SECTOR0
//      - BOOTMODE_BOOT_TO_SECURE_FLASH_BANK3_SECTOR0
//      - BOOTMODE_BOOT_TO_SECURE_FLASH_BANK4_SECTOR0
//      - BOOTMODE_IPC_MSGRAM_COPY_BOOT_TO_M1RAM
//      - BOOTMODE_BOOT_TO_M0RAM
//      - BOOTMODE_BOOT_TO_FWU_FLASH
//      - BOOTMODE_BOOT_TO_FWU_FLASH_ALT1
//      - BOOTMODE_BOOT_TO_FWU_FLASH_ALT2
//      - BOOTMODE_BOOT_TO_FWU_FLASH_ALT3
//
// Note that while using BOOTMODE_IPC_MSGRAM_COPY_BOOT_TO_M1RAM,
// BOOTMODE_IPC_MSGRAM_COPY_LENGTH_xxxW must be ORed with the bootmode parameter
//
// This function must be called after Device_init function
//
//*****************************************************************************
void Device_bootCPU2(uint32_t bootmode)
{
    //
    // Configure the CPU1TOCPU2IPCBOOTMODE register
    //
    IPC_setBootMode(IPC_CPU1_L_CPU2_R,
                    (BOOT_KEY | bootmode));

    //
    // Set IPC Flag 0
    //
    IPC_setFlagLtoR(IPC_CPU1_L_CPU2_R, IPC_FLAG0);

    //
    // Bring CPU2 out of reset. Wait for CPU2 to go out of reset.
    //
    SysCtl_controlCPU2Reset(SYSCTL_CORE_DEACTIVE);
    while(SysCtl_isCPU2Reset() == 0x1U);
}
#endif

//*****************************************************************************
//
// Function to turn on all peripherals, enabling reads and writes to the
// peripherals' registers.
//
// Note that to reduce power, unused peripherals should be disabled.
//
//*****************************************************************************
void Device_enableAllPeripherals(void)
{
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_DMA);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_TIMER0);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_TIMER1);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_TIMER2);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CPUBGCRC);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_TBCLKSYNC);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ERAD);
#ifdef CPU1
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CLA1);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CLA1BGCRC);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_GTBCLKSYNC);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EMIF1);
#endif

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM1);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM2);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM3);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM4);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM5);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM6);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM7);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM8);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM9);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM10);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM11);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM12);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM13);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM14);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM15);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM16);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM17);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPWM18);

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ECAP1);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ECAP2);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ECAP3);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ECAP4);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ECAP5);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ECAP6);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ECAP7);

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EQEP1);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EQEP2);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EQEP3);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EQEP4);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EQEP5);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EQEP6);

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_SD1);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_SD2);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_SD3);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_SD4);

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_SCIA);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_SCIB);

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_UARTA);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_UARTB);

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_SPIA);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_SPIB);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_SPIC);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_SPID);

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_I2CA);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_I2CB);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_PMBUSA);

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CANA);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_MCANA);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_MCANB);

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_USBA);

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ADCA);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ADCB);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ADCC);

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CMPSS1);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CMPSS2);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CMPSS3);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CMPSS4);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CMPSS5);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CMPSS6);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CMPSS7);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CMPSS8);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CMPSS9);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CMPSS10);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CMPSS11);

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_DACA);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_DACC);

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CLB1);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CLB2);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CLB3);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CLB4);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CLB5);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_CLB6);

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_FSITXA);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_FSITXB);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_FSIRXA);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_FSIRXB);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_FSIRXC);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_FSIRXD);

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_LINA);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_LINB);


    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_DCC0);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_DCC1);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_DCC2);

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ECAT);

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_HRCAL0);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_HRCAL1);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_HRCAL2);

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_AESA);

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_EPG1);

    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ADCCHECKER1);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ADCCHECKER2);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ADCCHECKER3);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ADCCHECKER4);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ADCCHECKER5);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ADCCHECKER6);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ADCCHECKER7);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ADCCHECKER8);
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_ADCSEAGGRCPU1);
}

//*****************************************************************************
//
// Function to disable pin locks and enable pullups on GPIOs.
//
//*****************************************************************************
void Device_initGPIO(void)
{
    //
    // Disable pin locks.
    //
    GPIO_unlockPortConfig(GPIO_PORT_A, 0xFFFFFFFF);
    GPIO_unlockPortConfig(GPIO_PORT_B, 0xFFFFFFFF);
    GPIO_unlockPortConfig(GPIO_PORT_C, 0xFFFFFFFF);
    GPIO_unlockPortConfig(GPIO_PORT_D, 0xFFFFFFFF);
    GPIO_unlockPortConfig(GPIO_PORT_E, 0xFFFFFFFF);
    GPIO_unlockPortConfig(GPIO_PORT_F, 0xFFFFFFFF);
    GPIO_unlockPortConfig(GPIO_PORT_H, 0xFFFFFFFF);
}

//*****************************************************************************
//
// Function to verify the XTAL frequency
// freq is the XTAL frequency in MHz
// The function return true if the the actual XTAL frequency matches with the
// input value
//
// Note that this function assumes that the PLL is not already configured and
// hence uses SysClk freq = 10MHz for DCC calculation
//
//*****************************************************************************
bool Device_verifyXTAL(float freq)
{
    //
    // Use DCC to verify the XTAL frequency using INTOSC2 as reference clock
    //

    //
    // Turn on XTAL and wait for it to power up using X1CNT
    //
    SysCtl_turnOnOsc(SYSCTL_OSCSRC_XTAL);
    SysCtl_clearExternalOscCounterValue();
    while(SysCtl_getExternalOscCounterValue() != SYSCTL_X1CNT_X1CNT_M);

    //
    // Enable DCC0 clock
    //
    SysCtl_enablePeripheral(SYSCTL_PERIPH_CLK_DCC0);

    //
    // Insert atleast 5 cycles delay after enabling the peripheral clock
    //
    asm(" RPT #5 || NOP");

    //
    // Configures XTAL as CLKSRC0 and INTOSC2 as CLKSRC1
    // Fclk0 = XTAL frequency (input parameter)
    // Fclk1 = INTOSC2 frequency = 10MHz
    //
    // Configuring DCC error tolerance of +/-1%
    // INTOSC2 can have a variance in frequency of +/-10%
    //
    // Assuming PLL is not already configured, SysClk freq = 10MHz
    //
    // Note : Update the tolerance and INTOSC2 frequency variance as necessary.
    //
    return (DCC_verifyClockFrequency(DCC0_BASE,
                                     DCC_COUNT1SRC_INTOSC2, 10.0F,
                                     DCC_COUNT0SRC_XTAL, freq,
                                     1.0F, 10.0F, 10.0F));

}

//*****************************************************************************
//
// Error handling function to be called when an ASSERT is violated
//
//*****************************************************************************
void __error__(const char *filename, uint32_t line)
{
    //
    // An ASSERT condition was evaluated as false. You can use the filename and
    // line parameters to determine what went wrong.
    //
    ESTOP0;
}