2022年DSP的C语言编程 .pdf

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1、DSP的 C语言开发一、流程步骤：Resetvectors.asmc_int00(位于rts.lib 中)_args_main()（位于 rts.lib 中）调用 main（）1、配置 CPU相关寄存器2、初始化时钟和PLL3、配置相关外设寄存器4、设置中断（一关二设三开）main() 开始主要程序返回 c_int00下面是 vectors.asm函数，该文件在每个DSP的 project 中（需手工加入），其中有对_c_int00的调用， 而_c_int00在 rts.lib 中， 在开发时要手工加入。在 reset后， rom 等外存中的程序已经转移到了L2 cache中， 并且程序从 0

2、 x0000 0000处开始执行，而 0 x0000 0000处的程序正是 vectors.asm，以下就开始层层调用，进入 main 函数。= vectors.asm = 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 1 页，共 17 页 - - - - - - - - - ; Plug in the entry point at RESET in the interrupt vector table ; ; ; = unused = ; plug inifinite loop

3、- with nested branches to ; disable interrupts - for all undefined vectors ; unused .macro id .global unused:id: unused:id: b unused:id: ; nested branches to block interrupts nop 4 b unused:id: nop nop nop nop nop .endm .sect .vectors .ref _c_int00 ; C entry point .align 32*8*4 ; must be aligned on

4、256 word boundary RESET: ; reset vector mvkl _c_int00,b0 ; load destination function address to b0 mvkh _c_int00,b0 b b0 ; start branch to destination function mvc PCE1,b0 ; address of interrupt vectors mvc b0,ISTP ; set table to point here nop 3 ; fill delay slot nop nop ; ; plug unused interrupts

5、with infinite loops to ; catch stray interrupts ; unused 1 unused 2 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 2 页，共 17 页 - - - - - - - - - unused 3 unused 4 unused 5 unused 6 unused 7 unused 8 unused 9 unused 10 unused 11 unused 12 unused 13 unused 14 unused 15

6、Rts6000.lib来自于 rts6000.src， 该原文件是由多个 .c和.cpp以及.asm组成的，其中关于int _args_main()的函数：这个函数就是void _interrupt c_int00()在初始化完成后调用的函数，int _args_main()函数中调用了main(argc, argv)从而正式转入main 函数。args_main.c/ 1162235705 0 0 0 1930 /*/ /* The ARGS data structure is defined according to a convention with linker. */ /* */ /

7、* If the user want to pass arguments to loader, -args=# option has to */ /* be used in linking to generate executable. With this option, the linker */ /* will allocate a section starting with _c_args_, and with this # many */ /* bytes. The loader when parses the arguments, will dump the number of */

8、 /* arguments, argc as the 1st arguments at address _c_args_, all the actual */ /* arguments will be dumped after that. The total space for these arguments */ /* will not exceed # bytes. */ /* */ /* if -args=# is not used as a linker option, linker will put -1 at */ /* _c_args_ location. */ /* */ /*

9、 Based on the above convention, the following code implements the access to */ /* these arguments when main is called. */ /* */ /* This function is called from boot.asm or boot.c. */ /*/ typedef struct int argc; char *argv1; ARGS; extern ARGS _c_args_; 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - -

10、- - - - - 名师精心整理 - - - - - - - 第 3 页，共 17 页 - - - - - - - - - extern far int main(int argc, char *argv); int _args_main() register ARGS *pargs = &_c_args_; register int argc = 0; register char *argv = 0; if (pargs != (ARGS *)-1) argc = pargs-argc; argv = pargs-argv; return main(argc, argv); 以下是 boot

11、.c 文件：其中有extern void _interrupt c_int00()进行 C环境的初始化，比如堆栈的建立等，以及对main 函数的调用。boot.c/ 1162235706 0 0 0 3018 /*/ /* BOOT.C v6.0.8 - Initialize the C60 C runtime environment */ /* Copyright (c) 1993-2006 Texas Instruments Incorporated */ /*/ #include #define CINIT (void*)&_cinit_) extern far int _cinit_;

12、 extern far int _args_main(); extern far void exit(int status); extern far void _auto_init(const void *cinit); /*-*/ /* ALLOCATE THE MEMORY FOR THE SYSTEM STACK. THIS SECTION WILL BE SIZED */ /* BY THE LINKER. */ /*-*/ _asm(t.global _STACK_SIZE); #pragma DATA_ALIGN (_stack, 8); #pragma DATA_SECTION

13、(_stack, .stack); char _stack8; /*/ /* C_INT00() - C ENVIRONMENT ENTRY POINT */ /*/ 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 4 页，共 17 页 - - - - - - - - - extern void _interrupt c_int00() /*-*/ /* SET UP THE STACK POINTER IN B15. */ /* THE STACK POINTER POINTS 1

14、 WORD PAST THE TOP OF THE STACK, SO SUBTRACT */ /* 1 WORD FROM THE SIZE. ALSO THE SP MUST BE ALIGNED ON AN 8-BYTE BOUNDARY*/ /*-*/ _asm(t MVKLtt _stack + _STACK_SIZE - 4, SP); _asm(t MVKHtt _stack + _STACK_SIZE - 4, SP); _asm(t ANDtt 7,SP,SP); /*-*/ /* SET UP THE GLOBAL PAGE POINTER IN B14. */ /*-*/

15、 _asm(t MVKLtt $bss,DP); _asm(t MVKHtt $bss,DP); /*-*/ /* SET UP FLOATING POINT REGISTERS FOR C6700 */ /*-*/ #ifdef _TMS320C6700 FADCR = 0; FMCR = 0; #endif /*-*/ /* CALL THE AUTOINITIALIZATION ROUTINE. */ /*-*/ _auto_init(CINIT); _args_main(); /*-*/ /* CALL EXIT. */ /*-*/ exit(1); 通过以上步骤就完成了C语言环境的初

16、始化，并且自动进入到 main函数中，当然，main 函数执行结束后，又会返回到void _interrupt c_int00()中，参看上面黄色标记部分。二、需要文件：这里是不使用 BIOS和 csl库时的方法。1)gel文件： CCS调试时使用，因为不用reset，主要是 startup 程序。/* 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 5 页，共 17 页 - - - - - - - - - * This GEL file (init6x0 x.gel) is loa

17、ded on the command line * of Code Composer. It provides example code on how to * reset the C6x DSP and initialize the External Memory Interface. * * You may have to edit settings in emif_init() to your own * specifications as the example is applicable to the C6x EVM. * */ /* * The StartUp() function

18、 is called every time you start * Code Composer. You can customize this function to * initialize wait states in the EMIF or to perform * other initialization. */ StartUp() /* C6201 map1 specific memory mapping */ GEL_MapOn(); GEL_MapReset(); GEL_MapAdd(0 x00000000, 0, 0 x00010000, 1, 1); /* Internal

19、 Program RAM */ GEL_MapAdd(0 x00400000, 0, 0 x00c00000, 1, 1); /* External Memory Interface CE0 */ GEL_MapAdd(0 x01000000, 0, 0 x00400000, 1, 1); /* External Memory Interface CE0 */ GEL_MapAdd(0 x01400000, 0, 0 x00010000, 1, 1); /* External Memory Interface CE1 */ GEL_MapAdd(0 x01410000, 0, 0 x003f0

20、000, 1, 1); /* External Memory Interface CE1 */ GEL_MapAdd(0 x01800000, 0, 0 x00000024, 1, 1); /* Internal Peripheral Bus EMIF Registers */ GEL_MapAdd(0 x01840000, 0, 0 x00000074, 1, 1); /* Internal Peripheral Bus DMA Controller Registers */ GEL_MapAdd(0 x018c0000, 0, 0 x00000028, 1, 1); /* Internal

21、 Peripheral Bus McBSP0 Registers */ GEL_MapAdd(0 x01900000, 0, 0 x00000028, 1, 1); /* Internal Peripheral Bus McBSP1 Registers */ GEL_MapAdd(0 x01940000, 0, 0 x0000000c, 1, 1); /* Internal Peripheral Bus Timer0 Registers */ GEL_MapAdd(0 x01980000, 0, 0 x0000000c, 1, 1); /* Internal Peripheral Bus Ti

22、mer1 Registers */ GEL_MapAdd(0 x019c0000, 0, 0 x0000000c, 1, 1); /* Internal Peripheral Bus Interrupt Selector Registers */ GEL_MapAdd(0 x02000000, 0, 0 x01000000, 1, 1); /* External Memory Interface CE2 */ GEL_MapAdd(0 x03000000, 0, 0 x01000000, 1, 1); /* External Memory Interface CE3 */ GEL_MapAdd

23、(0 x80000000, 0, 0 x00010000, 1, 1); /* Internal Data RAM */ OnTargetConnect() 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 6 页，共 17 页 - - - - - - - - - /* initialize the EMIF registers on the C6x when Code Composer starts up */ emif_init(); /* OnReset callback fun

24、ction called after the target processor has been reset */ OnReset(int nErrorCode) if (nErrorCode) GEL_TextOut(An error occured while resetting -%d-n,nErrorCode); else emif_init(); /* * Menuitem creates a selection available beneath the GEL * menu selection in Code Composer Studio. */ menuitem Resets

25、; hotmenu Reset_and_EMIF_Setup() GEL_Reset(); emif_init(); hotmenu Reset_EMIFset_and_ClearBreakPts() GEL_Reset(); emif_init(); GEL_BreakPtReset(); 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 7 页，共 17 页 - - - - - - - - - /*/ emif_init() /*-*/ /* EMIF REGISTER VALUE

26、S FROM SPRU269B */ /*-*/ #define EMIF_GCTL 0 x01800000 #define EMIF_CE1 0 x01800004 #define EMIF_CE0 0 x01800008 #define EMIF_CE2 0 x01800010 #define EMIF_CE3 0 x01800014 #define EMIF_SDRAMCTL 0 x01800018 #define EMIF_SDRAMREF 0 x0180001c /* * Edit values below to conform to your specifications * Th

27、e following assumes the EVM6x memory configuration */ /* OK for 133, 160 MHK CPU clock rate */ *(int *)EMIF_GCTL = 0 x3060; /* CE1 */ *(int *)EMIF_CE1 = 0 x40f40323; /* CE0 SBSRAM */ *(int *)EMIF_CE0 = 0 x30; /* CE2 and CE3 SBSRAM */ *(int *)EMIF_CE2 = 0 x30; *(int *)EMIF_CE3 = 0 x30; 2)rts.lib 文件：运

28、行支持库3) cmd 文件：存储器配置文件：F2812例子名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 8 页，共 17 页 - - - - - - - - - /* / TI File $Revision: /main/3 $ / Checkin $Date: March 16, 2007 15:33:27 $ /# / / FILE: DSP281x_Headers_nonBIOS.cmd / / TITLE: DSP281x Peripheral registers link

29、er command file / / DESCRIPTION: / / This file is for use in Non-BIOS applications. / / Linker command file to place the peripheral structures / used within the DSP28 headerfiles into the correct memory / mapped locations. / / This version of the file includes the PieVectorTable structure. / For BIO

30、S applications, please use the DSP281x_Headers_BIOS.cmd file / which does not include the PieVectorTable structure. / /# / $TI Release: DSP281x Header Files V1.11 $ / $Release Date: September 26, 2007 $ /# */ MEMORY PAGE 0: /* Program Memory */ PAGE 1: /* Data Memory */ DEV_EMU : origin = 0 x000880,

31、 length = 0 x000180 /* device emulation registers */ PIE_VECT : origin = 0 x000D00, length = 0 x000100 /* PIE Vector Table */ FLASH_REGS : origin = 0 x000A80, length = 0 x000060 /* FLASH registers */ CSM : origin = 0 x000AE0, length = 0 x000010 /* code security module registers */ XINTF : origin = 0

32、 x000B20, length = 0 x000020 /* external interface registers */ CPU_TIMER0 : origin = 0 x000C00, length = 0 x000008 /* CPU Timer0 registers (CPU Timer1 and Timer2 are reserved for BIOS)*/ PIE_CTRL : origin = 0 x000CE0, length = 0 x000020 /* PIE control registers */ ECANA : origin = 0 x006000, length

33、 = 0 x000040 /* eCAN control and status registers */ ECANA_LAM : origin = 0 x006040, length = 0 x000040 /* eCAN local acceptance masks */ ECANA_MOTS : origin = 0 x006080, length = 0 x000040 /* eCAN message object time stamps 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - -

34、 - 第 9 页，共 17 页 - - - - - - - - - */ ECANA_MOTO : origin = 0 x0060C0, length = 0 x000040 /* eCAN object time-out registers */ ECANA_MBOX : origin = 0 x006100, length = 0 x000100 /* eCAN mailboxes */ SYSTEM : origin = 0 x007010, length = 0 x000020 /* System control registers */ SPIA : origin = 0 x007

35、040, length = 0 x000010 /* SPI registers */ SCIA : origin = 0 x007050, length = 0 x000010 /* SCI-A registers */ XINTRUPT : origin = 0 x007070, length = 0 x000010 /* external interrupt registers */ GPIOMUX : origin = 0 x0070C0, length = 0 x000020 /* GPIO mux registers */ GPIODAT : origin = 0 x0070E0,

36、 length = 0 x000020 /* GPIO data registers */ ADC : origin = 0 x007100, length = 0 x000020 /* ADC registers */ EVA : origin = 0 x007400, length = 0 x000040 /* Event Manager A registers */ EVB : origin = 0 x007500, length = 0 x000040 /* Event Manager B registers */ SCIB : origin = 0 x007750, length =

37、 0 x000010 /* SCI-B registers */ MCBSPA : origin = 0 x007800, length = 0 x000040 /* McBSP registers */ CSM_PWL : origin = 0 x3F7FF8, length = 0 x000008 /* Part of FLASHA. CSM password locations. */ SECTIONS PieVectTableFile : PIE_VECT, PAGE = 1 /* Peripheral Frame 0 Register Structures */ DevEmuRegs

38、File : DEV_EMU, PAGE = 1 FlashRegsFile : FLASH_REGS, PAGE = 1 CsmRegsFile : CSM, PAGE = 1 XintfRegsFile : XINTF, PAGE = 1 CpuTimer0RegsFile : CPU_TIMER0, PAGE = 1 PieCtrlRegsFile : PIE_CTRL, PAGE = 1 /* Peripheral Frame 1 Register Structures */ ECanaRegsFile : ECANA, PAGE = 1 ECanaLAMRegsFile : ECAN

39、A_LAM PAGE = 1 ECanaMboxesFile : ECANA_MBOX PAGE = 1 ECanaMOTSRegsFile : ECANA_MOTS PAGE = 1 ECanaMOTORegsFile : ECANA_MOTO PAGE = 1 /* Peripheral Frame 2 Register Structures */ SysCtrlRegsFile : SYSTEM, PAGE = 1 SpiaRegsFile : SPIA, PAGE = 1 SciaRegsFile : SCIA, PAGE = 1 XIntruptRegsFile : XINTRUPT

40、, PAGE = 1 GpioMuxRegsFile : GPIOMUX, PAGE = 1 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 10 页，共 17 页 - - - - - - - - - GpioDataRegsFile : GPIODAT PAGE = 1 AdcRegsFile : ADC, PAGE = 1 EvaRegsFile : EVA, PAGE = 1 EvbRegsFile : EVB, PAGE = 1 ScibRegsFile : SCIB, PA

41、GE = 1 McbspaRegsFile : MCBSPA, PAGE = 1 /* Code Security Module Register Structures */ CsmPwlFile : CSM_PWL, PAGE = 1 /* end of file */ 4) vectors.asm：中断向量表 : 5) GlobalVariableDefs.c ： 将变量与文件区对应起来，从而在cmd 中将文件区与存储区对应起来。例子：#ifdef _cplusplus #pragma DATA_SECTION(GpioMuxRegsFile) #else #pragma DATA_SEC

42、TION(GpioMuxRegs,GpioMuxRegsFile); #endif volatile struct GPIO_MUX_REGS GpioMuxRegs; /- #ifdef _cplusplus #pragma DATA_SECTION(McbspaRegsFile) #else #pragma DATA_SECTION(McbspaRegs,McbspaRegsFile); #endif volatile struct MCBSP_REGS McbspaRegs; 6) 芯片的总体 .h 和.c 文件 : 给数据类型规范、 给寄存器赋值等。 以及芯片的初始化等（基于 stru

43、ct 和 union） 。具体而言， PLL和时钟、看门狗（如果有的话） 、中断配置等。说明： 1、每个 union 是一个寄存器的格式；2、每个 union 的变量是寄存器本身（实际上只有这一个变量）3、对 union 变量的每次赋值是对寄存器的一次配置。4、寄存器格式在相关 .h 中定义，寄存器变量在相关.c 中定义，Main.c 中进行寄存器赋值7) 各个子外设的 .h 和.c 文件： 外设的初始化、 配置、对外设的相关操作 （基于 struct 和 union）名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理

44、 - - - - - - - 第 11 页，共 17 页 - - - - - - - - - 8) main.c 主程序。这些文件的关系图：main.c芯片的总体 .h和.c文件各个子外设的 .h和.c文件GlobalVariableDefs.c vectors.asmcmd文件rts.lib 文件Gel文件三、定时中断例程：主程序：void main() /* Initialize CSL, must when using CSL. */ CSL_init(); /* Initialize DEC6713 board. */ 名师资料总结 - - -精品资料欢迎下载 - - - - - -

45、- - - - - - - - - - - - 名师精心整理 - - - - - - - 第 12 页，共 17 页 - - - - - - - - - DEC6713_init(); /* Open TIMER1 device, and reset them to power-on default state. */ hTimer1 = TIMER_open(TIMER_DEV1,TIMER_OPEN_RESET); /* Obtain the event ID for the timer device. */ TimerEventId = TIMER_getEventId(hTimer1)

46、; IRQ_setVecs(vectors); /* point to the IRQ vector table */ IRQ_globalEnable(); /* Globally enable interrupts */ IRQ_nmiEnable(); /* Enable NMI interrupt */ /* Map TIMER events to physical interrupt number */ IRQ_map(TimerEventId, 14); /* Reset the timer events. */ IRQ_reset(TimerEventId); /* Config

47、ure the timer devices */ TIMER_configArgs(hTimer1, TimerControl, /* use predefined control value */ 0 x00000B72, /* set period */ 0 x00000000 /* start count value at zero */ ); /* Enable the timer events(events are disabled while resetting) */ IRQ_enable(TimerEventId); /* Start the timers */ TIMER_s

48、tart(hTimer1); while(cnt TIMER_CNT) TIMER_pause(hTimer1); TIMER_close(hTimer1); printf(nDone.); exit(0); printf(n Count : %3d ,cnt); /* name: Interrupt Service Routine c_int14 purpose: ISR to service TIMERINT1. vecs.asm must be modified to include c_int14 entry. inputs: n/a returns: n/a */ interrupt

49、 void c_int14(void) TimerEventHandler(); return; /* end c_int14 */ /* * End of DEC6713_TIMER.c */ 中断向量表：* * vecs.asm V1.00 * Copyright 2004 by SEED Electronic Technology LTD. 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 14 页，共 17 页 - - - - - - - - - * All rights re

50、served. SEED Electronic Technology LTD. * Restricted rights to use, duplicate or disclose this code are * granted through contract. * Designed by: Hongshuai.Li * *- * Global symbols defined here and exported out of this file *- .global _vectors .global _c_int00 .global _vector1 .global _vector2 .glo