[参考译文] TMS320F28335：闪存和 RAM 中的程序执行时间

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https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1217001/tms320f28335-program-execution-time-in-flash-and-ram

器件型号：TMS320F28335

大家好！

我使用 TMS320F28335进行电机控制。有人会告诉我当整个程序被写入闪存时、程序执行的最大频率吗？每次微控制器达到运行统计时、是否有办法将已写入程序从闪存移动到 RAM？如何实现？以这种方式更快地执行代码？

此致

2 年多前

0 admin 2 年多前

TI__Guru**** 2589280 points

请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

您好、Jake、

从闪存运行程序会更慢(根据表7.9.7.4 "闪存/OTP 存取时序"、存取时间约为37ns、我不知道这对于程序执行与数据访问是否发生了变化)。程序从中运行的存储器可以在 CCS 工程的.cmd 文件中进行配置。最佳方法是将所有代码加载到闪存中、并将需要及时执行的代码移动到 RAM 一次(最好不要重复复制、除非器件断电或复位)。代码在 RAM 上的执行速度更快、在闪存上执行大部分的初始配置将节省 RAM 上的一些空间。

我提供了一个基本模板、用于配置.cmd 文件以便从闪存启动并使用 F2838x 器件将程序加载到 RAM (您需要调整命名/为您的器件提供的 RAM 单元、但主要观点是使用.TI.ramfunc、.binit、#pragma 语句、和 memcpy 函数)。

命令链接器文件：

MEMORY
{
   /* BEGIN is used for the "boot to SARAM" bootloader mode   */
   BEGIN            : origin = 0x000000, length = 0x000002
   BOOT_RSVD        : origin = 0x000002, length = 0x0001AF     /* Part of M0, BOOT rom will use this for stack */
   RAMM0            : origin = 0x0001B1, length = 0x00024F
   RAMM1            : origin = 0x000400, length = 0x0003F8     /* on-chip RAM block M1 */
//   RAMM1_RSVD       : origin = 0x0007F8, length = 0x000008     /* Reserve and do not use for code as per the errata advisory "Memory: Prefetching Beyond Valid Memory" */
   RAMD0            : origin = 0x00C000, length = 0x000800
   RAMD1            : origin = 0x00C800, length = 0x000800
   RAMLS0           : origin = 0x008000, length = 0x000800
   RAMLS1           : origin = 0x008800, length = 0x000800
   RAMLS2           : origin = 0x009000, length = 0x000800
   RAMLS3           : origin = 0x009800, length = 0x000800
   RAMLS4           : origin = 0x00A000, length = 0x000800
   RAMLS5           : origin = 0x00A800, length = 0x000800
   RAMLS6           : origin = 0x00B000, length = 0x000800
   RAMLS7           : origin = 0x00B800, length = 0x000800
   RAMGS0           : origin = 0x00D000, length = 0x001000
   RAMGS1           : origin = 0x00E000, length = 0x001000
   RAMGS2           : origin = 0x00F000, length = 0x001000
   RAMGS3           : origin = 0x010000, length = 0x001000
   RAMGS4           : origin = 0x011000, length = 0x001000
   RAMGS5           : origin = 0x012000, length = 0x001000
   RAMGS6           : origin = 0x013000, length = 0x001000
   RAMGS7           : origin = 0x014000, length = 0x001000
   RAMGS8           : origin = 0x015000, length = 0x001000
   RAMGS9           : origin = 0x016000, length = 0x001000
   RAMGS10          : origin = 0x017000, length = 0x001000
   RAMGS11          : origin = 0x018000, length = 0x001000
   RAMGS12          : origin = 0x019000, length = 0x001000
   RAMGS13          : origin = 0x01A000, length = 0x001000
   RAMGS14          : origin = 0x01B000, length = 0x001000
   RAMGS15          : origin = 0x01C000, length = 0x000FF8
//   RAMGS15_RSVD     : origin = 0x01CFF8, length = 0x000008     /* Reserve and do not use for code as per the errata advisory "Memory: Prefetching Beyond Valid Memory" */

   /* Flash sectors */
   FLASH0           : origin = 0x080000, length = 0x002000  /* on-chip Flash */
   FLASH1           : origin = 0x082000, length = 0x002000  /* on-chip Flash */
   FLASH2           : origin = 0x084000, length = 0x002000  /* on-chip Flash */
   FLASH3           : origin = 0x086000, length = 0x002000  /* on-chip Flash */
   FLASH4           : origin = 0x088000, length = 0x008000  /* on-chip Flash */
   FLASH5           : origin = 0x090000, length = 0x008000  /* on-chip Flash */
   FLASH6           : origin = 0x098000, length = 0x008000  /* on-chip Flash */
   FLASH7           : origin = 0x0A0000, length = 0x008000  /* on-chip Flash */
   FLASH8           : origin = 0x0A8000, length = 0x008000  /* on-chip Flash */
   FLASH9           : origin = 0x0B0000, length = 0x008000  /* on-chip Flash */
   FLASH10          : origin = 0x0B8000, length = 0x002000  /* on-chip Flash */
   FLASH11          : origin = 0x0BA000, length = 0x002000  /* on-chip Flash */
   FLASH12          : origin = 0x0BC000, length = 0x002000  /* on-chip Flash */
   FLASH13          : origin = 0x0BE000, length = 0x002000  /* on-chip Flash */
   CPU1TOCPU2RAM    : origin = 0x03A000, length = 0x000800
   CPU2TOCPU1RAM    : origin = 0x03B000, length = 0x000800

   CPUTOCMRAM       : origin = 0x039000, length = 0x000800
   CMTOCPURAM       : origin = 0x038000, length = 0x000800

   CANA_MSG_RAM     : origin = 0x049000, length = 0x000800
   CANB_MSG_RAM     : origin = 0x04B000, length = 0x000800
   RESET            : origin = 0x3FFFC0, length = 0x000002
}


SECTIONS
{
   codestart        : > BEGIN
   .binit			: > FLASH3 /* .binit will execute before main because it's in the linker file */
   .text            : >> FLASH1 | FLASH2 | FLASH3 | FLASH4
   .cinit           : > FLASH1
   .switch          : > FLASH1
   .reset           : > RESET, TYPE = DSECT /* not used, */

	//
	// Copies contents from Flash 3 to RAMLS0 and RAMLS1 (if not enough room
	// on RAMLS0)
	//
   .TI.ramfunc : {} LOAD = FLASH3,
                    RUN = RAMLS0 | RAMLS1,
                    table(BINIT),
                    PAGE = 0, ALIGN(4)

   .stack           : > RAMM1
#if defined(__TI_EABI__)
   .bss             : > RAMLS5
   .bss:output      : > RAMGS0
   .init_array      : > RAMGS1
   .const           : >> FLASH5 | FLASH6 | FLASH7
   .data            : > RAMLS5
   .sysmem          : > RAMLS5
#else
   .pinit           : > FLASH1
   .ebss            : >> RAMLS5 | RAMGS0 | RAMGS1
   .econst          : >> FLASH5 | FLASH6 | FLASH7
   .esysmem         : > RAMLS5
#endif

   ramgs0 : > RAMGS0, type=NOINIT
   ramgs1 : > RAMGS1, type=NOINIT

   MSGRAM_CPU1_TO_CPU2 > CPU1TOCPU2RAM, type=NOINIT
   MSGRAM_CPU2_TO_CPU1 > CPU2TOCPU1RAM, type=NOINIT
   MSGRAM_CPU_TO_CM   > CPUTOCMRAM, type=NOINIT
   MSGRAM_CM_TO_CPU   > CMTOCPURAM, type=NOINIT
}

/*
//===========================================================================
// End of file.
//===========================================================================
*/

主程序代码：

//
// Included Files
//
#include "driverlib.h"
#include "device.h"
#include "board.h"
#include "c2000ware_libraries.h"

//
// This pre-processor command loads the function into the .TI.ramfunc
// section of memory
//
#pragma CODE_SECTION(ramCounter, ".TI.ramfunc");

//
// Main
//
void main(void)
{

    //
    // Initialize device clock and peripherals
    //
    Device_init();

    //
    // Disable pin locks and enable internal pull-ups.
    //
    Device_initGPIO();

    //
    // Initialize PIE and clear PIE registers. Disables CPU interrupts.
    //
    Interrupt_initModule();

    //
    // Initialize the PIE vector table with pointers to the shell Interrupt
    // Service Routines (ISR).
    //
    Interrupt_initVectorTable();

    //
    // PinMux and Peripheral Initialization
    //
    Board_init();

    //
    // C2000Ware Library initialization
    //
    C2000Ware_libraries_init();

    //
    // Copy functions from .TI.ramfunc from Flash to RAM; the method of using
    // binit replaces memcpy in this example, the line remains as a template
    // of how the function can be called
    //
    //EALLOW;
    //memcpy(&RamfuncsRunStart, &RamfuncsLoadStart, (size_t)&RamfuncsLoadSize);
    //EALLOW;

    //
    // Enable Global Interrupt (INTM) and real time interrupt (DBGM)
    //
    EINT;
    ERTM;

    while(1);
}

//
// End of File
//

此致、

Omer Amir

0 admin 2 年多前

TI__Guru**** 2589280 points

请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

感谢您的及时回复。

此致。

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[参考译文] TMS320F28335：闪存和 RAM 中的程序执行时间