AM2431: Trying to output MCU_HFOSC0_CLK on MCU_SPI0_CS1

Hi Jeff,

Thanks for your query.

Jeff Hendrix said:

How do I set this up in sysconfig?

To configure the C6 pin as Chip select pin. Please add the MCPSI peripheral in example.syscfg file as shown below. 

Please refer below image.

Jeff Hendrix said:

I need to set CTRLMMR_MCU_OBSCLK_CTRL bit 24 and I don't see any APIs to modify the MCU registers.

You can use the HW_RD_REG32() API to write the register.

Hope the above information helps.

Regards,

Tushar

Hi Jeff,

Jeff Hendrix said:

I can't figure out how to set it up in sysconfig

Sysconfig doesn't provide option to select the C6 pin as MCU_HFOSC0_CLK.

You can configure this manually inside the application.

Please refer the below code which configures the C6 pin as MCU_HFOSC0_CLK.

/*
 *  Copyright (C) 2021 Texas Instruments Incorporated
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *    Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 *    Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the
 *    distribution.
 *
 *    Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <kernel/dpl/DebugP.h>
#include <kernel/dpl/ClockP.h>
#include <kernel/dpl/AddrTranslateP.h>
#include <kernel/dpl/HwiP.h>
#include "ti_drivers_config.h"
#include "ti_drivers_open_close.h"
#include "ti_board_open_close.h"
#include <drivers/pinmux/am64x_am243x/pinmux.h>

#define CTRLMMR_MCU_OBSCLK_CTRL         (0x4508000)

#define CTRLMMR_MCU_LOCK2_KICK0         (0x4509008)
#define CTRLMMR_MCU_LOCK2_KICK1         (0x450900C)

#define CTRLMMR_MCU_LOCK2_KICK0_VAL     (0x68EF3490)
#define CTRLMMR_MCU_LOCK2_KICK1_VAL     (0xD172BC5A)

#define HFOSC0_CLK                      (0x6)


static Pinmux_PerCfg_t gPinMuxMcuDomainCfg1[] = {
    /* MCU GPIO0 pin config */
    /* MCU_GPIO0_12 -> MCU_SPI0_CS1 (C6) */
    {
        PIN_MCU_SPI0_CS1,
        ( PIN_MODE(1) | PIN_INPUT_ENABLE | PIN_PULL_DISABLE )
    },

    {PINMUX_END, PINMUX_END}
};

void gpio_input_interrupt_main(void *args)
{
    int32_t         retVal;
    HwiP_Params     hwiPrms;

    /* Open drivers to open the UART driver for console */
    Drivers_open();
    Board_driversOpen();

    // Pinmuxing the MCU_SPI0_CS1
    Pinmux_config(gPinMuxMcuDomainCfg1, PINMUX_DOMAIN_ID_MCU);

    // Unlock the CTRL_MMR
    HW_WR_REG32((uint32_t *)CTRLMMR_MCU_LOCK2_KICK0, CTRLMMR_MCU_LOCK2_KICK0_VAL);
    HW_WR_REG32((uint32_t *)CTRLMMR_MCU_LOCK2_KICK1, CTRLMMR_MCU_LOCK2_KICK1_VAL);

    // Configure the CTRLMMR_MCU_OBSCLK_CTRL register to output HFOSC0 CLK
    HW_WR_REG32((uint32_t *)CTRLMMR_MCU_OBSCLK_CTRL, (HW_RD_REG32((uint32_t*)CTRLMMR_MCU_OBSCLK_CTRL) | HFOSC0_CLK));

    // Lock the CTRL_MMR
    HW_WR_REG32((uint32_t *)CTRLMMR_MCU_LOCK2_KICK0, 0x0);
    HW_WR_REG32((uint32_t *)CTRLMMR_MCU_LOCK2_KICK1, 0x0);

    Board_driversClose();
    Drivers_close();
}

Note: Please make sure you have C6 pin physical connection or it is pinned out on the EVM to probe the clock signal.

Regards,

Tushar

Hi Jeff,

Jeff Hendrix said:

Thanks, I think this is what I was looking for.

Thanks for the confirmation.

Jeff Hendrix said:

It would be nice if examples like this were in the TRM

Thanks for the suggestion, but we don't put code in TRM. I will create an FAQ for the same.

Closing the thread as original query has been answered.

Regards,

Tushar