[参考译文] MSP432E401Y：如何从外部 SDRAM 执行代码。

亲爱的蔡杏娟。

我使用 在内部闪存中使用 JTAG 运行的定制应用代码将.out 文件数据写入 SDRAM。 将使用(QT GUI)应用从以太网接口接收数据、并接收从起始地址写入 SDRAM 中的数据。 然后将控制权授予 SDRAM 起始地址、如上所述。  

1.正如您之前讲过的、我对 链接器脚本文件存储器映射部分进行了更改。 但现在您给出的示例是、代码完全不同。

2.我想在 SDRAM 中运行下面的例子，把.out 文件写入 SDRAM ，然后从 SDRAM 开始执行代码？

3.在下面的代码和链接器脚本中需要做哪些更改?

4. MSP432E401Y SDRAM 起始地址为 0X60000000 并且我们的定制板中的 SDRAM 的大小 512 兆位。

5.在下面的示例代码和链接器脚本文件中需要做什么更改?

//*****************************************************************************
//
// blinky.c - Simple example to blink the on-board LED.
//
// Copyright (c) 2013-2017 Texas Instruments Incorporated.  All rights reserved.
// Software License Agreement
//
// Texas Instruments (TI) is supplying this software for use solely and
// exclusively on TI's microcontroller products. The software is owned by
// TI and/or its suppliers, and is protected under applicable copyright
// laws. You may not combine this software with "viral" open-source
// software in order to form a larger program.
//
// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
// DAMAGES, FOR ANY REASON WHATSOEVER.
//
//*****************************************************************************

#include <stdint.h>
#include <stdbool.h>
#include "ti/devices/msp432e4/driverlib/driverlib.h"

//*****************************************************************************
//
//! \addtogroup example_list
//! <h1>Blinky (blinky)</h1>
//!
//! A very simple example that blinks the on-board LED using direct register
//! access.
//
//*****************************************************************************

//*****************************************************************************
//
// The error routine that is called if the driver library encounters an error.
//
//*****************************************************************************
#ifdef DEBUG
void
__error__(char *pcFilename, uint32_t ui32Line)
{
    while(1);
}
#endif

//*****************************************************************************
//
// Blink the on-board LED.
//
//*****************************************************************************
int
main(void)
{
    volatile uint32_t ui32Loop;

    //
    // Enable the GPIO port that is used for the on-board LED.
    //
    SysCtlPeripheralEnable(SYSCTL_PERIPH_GPION);

    //
    // Check if the peripheral access is enabled.
    //
    while(!SysCtlPeripheralReady(SYSCTL_PERIPH_GPION))
    {
    }

    //
    // Enable the GPIO pin for the LED (PN0).  Set the direction as output, and
    // enable the GPIO pin for digital function.
    //
    GPIOPinTypeGPIOOutput(GPIO_PORTN_BASE, GPIO_PIN_0);

    //
    // Loop forever.
    //
    while(1)
    {
        //
        // Turn on the LED.
        //
        GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_0, GPIO_PIN_0);

        //
        // Delay for a bit.
        //
        for(ui32Loop = 0; ui32Loop < 200000; ui32Loop++)
        {
        }

        //
        // Turn off the LED.
        //
        GPIOPinWrite(GPIO_PORTN_BASE, GPIO_PIN_0, 0x0);

        //
        // Delay for a bit.
        //
        for(ui32Loop = 0; ui32Loop < 200000; ui32Loop++)
        {
        }
    }
}

/******************************************************************************
*
* Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
*
* 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.
*
 *****************************************************************************/
/* Suppress warnings and errors:                                            */
/* #10199-D CRC table operator (crc_table_for_<>) ignored:
    CRC table operator cannot be associated with empty output section       */
--diag_suppress=10199

--retain=interruptVectors

MEMORY
{
    FLASH (RX) : origin = 0x00000000, length = 0x00100000
    SRAM (RWX) : origin = 0x20000000, length = 0x00040000
}

/* The following command line options are set as part of the CCS project.    */
/* If you are building using the command line, or for some reason want to    */
/* define them here, you can uncomment and modify these lines as needed.     */
/* If you are using CCS for building, it is probably better to make any such */
/* modifications in your CCS project and leave this file alone.              */
/*                                                                           */
/* --heap_size=0                                                             */
/* --stack_size=256                                                          */
/* --library=rtsv7M4_T_le_eabi.lib                                           */

/* Section allocation in memory */

SECTIONS
{
#ifndef gen_crc_table
    .intvecs:   > 0x00000000
    .text   :   > FLASH
    .const  :   > FLASH
    .cinit  :   > FLASH
    .pinit  :   > FLASH
	.rodata :   > FLASH
    .init_array : > FLASH
#else
    .intvecs:   > 0x00000000, crc_table(crc_table_for_intvecs)
    .text   :   > FLASH, crc_table(crc_table_for_text)
    .const  :   > FLASH, crc_table(crc_table_for_const)
    .cinit  :   > FLASH, crc_table(crc_table_for_cinit)
    .pinit  :   > FLASH, crc_table(crc_table_for_pinit)
	.rodata : 	> FLASH, crc_table(crc_table_for_pinit)
    .init_array : > FLASH, crc_table(crc_table_for_init_array)
    .TI.crctab  : > FLASH
#endif

    .vtable :   > 0x20000000
    .data   :   > SRAM
    .bss    :   > SRAM
    .sysmem :   > SRAM
    .stack  :   > SRAM
}

__STACK_TOP = __stack + 512;

此致、

Naga Narasimha Rao P

您好！

 我想看看我是否能为你找到一个例子,但由于即将到来的美国假期,可能能够提供帮助的人是不在办公室,这将需要一些时间。 话虽如此、我之前展示的示例代码和链接器命令文件应作为实现此目标的概念。 是的、正如我在开头所述、它用于不同的器件。

 在这个例子中,它调用 EMIF_SDRAMInit ()。 您必须将其替换为您自己的 TM4C129上 EPI 模块初始化。  有关如何为 SDRAM 操作初始化 EPI、您可以参阅位于 C：\ti\TivaWare_C_Series-2.2.0.295\examples\peripherals\epi\SDRAM.c 的 TivaWare 示例。  

 如果我找到一个更好的示例、我会重新发布。  

您好！

请提供 示例代码以尽快从 SDRAM 中执行代码。

此致、

Naga Narasimha Rao P  

您好！

 今天是美国公共假日。 请预计响应会延迟。  

您好！

 请提供 MSP432E401Y MCU 的示例代码和链接器脚本、以从 SDRAM 执行代码。  

 我计划 按照以下方法从 SDRAM 执行代码：

1.我将在 MCU 的内部闪存中运行引导加载程序代码。 其中包含 SDRAM 和外部 SPI 闪存( NVM )初始化。

2.然后引导加载程序会将应用程序映像文件从外部闪存复制到 SDRAM 中。

3.然后执行 SDRAM 形式的应用程序。

此致、

Naga Narasimha Rao P

TI 参考设计软件配套资料具有您所需的一切。 我不知道还能提供什么。 配套软件具有带挂钩函数的引导加载程序、可用于初始化 EPI 和 SPI 闪存。 请查看 bl_config.h 文件。 引导加载程序示例位于 ektm4c129_qssi_bootloader 中。 该应用示例位于 ektm4c129_qssi_boot_deme1中。