Make DSP C++ programs as simple and clear as ARM/MCU

灞波儿奔

Make DSP C++ programs as simple and clear as ARM/MCU [Copy link]

/*----------------------------------------- DSP novice's first timer practical demonstration program -----------------------------------------*/ #include//C language can use stdio.h #include//C语言可以用string.h  
#include "C5402DEF.h"//  
  
volatile bool IOXF;  
volatile unsigned int SystemRamTest;  
  
extern "C" interrupt void Timer0Isr();  
extern "C" interrupt void Timer1Isr();  
  
class SystemObj {//系统类  
public:  
  SystemObj(void);  
public:  
  inline void SystemInit(void);  
  inline void PllInit(void);  
private:  
  unsigned int SystemRamTest;  
};  
  
SystemObj::SystemObj(void)  
{  
  Disable();//关中断  
  SREG->IMR = 0x0000;  
  SREG->IFR = 0xffff;  
//设置0x0080为中断向量表首址，在第2个128页内。  
  SREG->PMST = (0x01 << PMST_IPTR) | (1 << PMST_MP_MC) | (1 << PMST_OVLY);  
//  SREG->PMST |= (1 << PMST_DROM);//数据可const.   
/*---------------------------------------------------------------------------
若：设置0x0100为中断向量表首址，在第3个128页内。
则：*.cmd文件应该改为：
     PAGE 0: VECS: origin=0x0100,  length=0x66
则：
  SREG->PMST = (0x02 << PMST_IPTR) | (1 << PMST_MP_MC) | (1 << PMST_OVLY);
----------------------------------------------------------------------------*/  
  SystemInit();//系统初始化  
}  
  
void SystemObj::SystemInit(void)  
{  
  PllInit();//PLL初始化  
  if (::SystemRamTest != 0x55aa) {  
    ::SystemRamTest = 0x55aa;  
  }  
  if (SystemRamTest != 0x55aa) {  
    SystemRamTest = 0x55aa;  
  }  
  IOXF = 0;  
}  
  
void SystemObj::PllInit(void)  
{  
volatile unsigned int start;  
  do {  
    SREG->CLKMD = 0;  
    __nop();   
  }  
  while(SREG->CLKMD & (1 << CLKMD_PLLSTATUS));  
  SREG->CLKMD = (9 << CLKMD_PLLMUL) | (30 << CLKMD_PLLCOUNT) | (1 << CLKMD_PLLONOFF) | (1 << CLKMD_PLLNDIV) | (1 << CLKMD_PLLSTATUS);//100M  
//  SREG->CLKMD = (14 << CLKMD_PLLMUL) | (30 << CLKMD_PLLCOUNT) | (1 << CLKMD_PLLONOFF) | (1 << CLKMD_PLLNDIV) | (1 << CLKMD_PLLSTATUS);//150M  
  for (start = 0; start < 10000; start ++);//等待外设上电复位正常结束  
}  
  
SystemObj Sys;  
  
int main(void)  
{  
  DMA->DMSDI = 0;  
  DMA->DMPREC = 0;  
  TI_BASE_McBSP0->DXR10 = 0x00;  
  TI_BASE_McBSP0->SPSA0 = SPCR1;  
  TI_BASE_McBSP0->SPSD0 = 0x00;//SPCR1 = 0x00  
  McBSP0->DXR10 = 0x00;  
  McBSP0->SPSA0 = SPCR1;  
  McBSP0->SPSD0 = 0x00;//SPCR1 = 0x00  
  SREG->ST1 |= (1 << ST1_INTM);//应该用Disable();//关中断！！！否则无效！  
  __nop();  
  __nop();  
  SREG->ST1 &= ~(1 << ST1_INTM);//应该用Enable();//开中断！！！否则无效！  
  __nop();  
  __nop();  
  TIMER0->TCR |= (1 << TCR_TSS);//关闭启动定时器0  
  SREG->IMR = 0x0000;  
  SREG->IFR = 0xffff;  
  TIMER0->PRD = 50000;//设置定时周期  
  TIMER0->TCR &= ~(1 << TCR_TSS);//启动定时器0  
  SREG->IMR |= (1 << IMR_TINT0);//允许TINT0中断  
  TIMER1->TCR &= ~(1 << TCR_TSS);//启动定时器1  
  SREG->IMR |= (1 << IMR_TINT1);//允许TINT1中断  
  Enable();//开中断  
  while(1)  
  {  
    __nop();  
//   SREG->ST1 ^= (1 << ST1_XF);  
    __nop();  
  
    if (::IOXF) {  
      SREG->ST1 |= (1 << ST1_XF);  
    }  
    else {  
      SREG->ST1 &= ~(1 << ST1_XF);  
    }  
    idle1();  
  }  
}  
  
interrupt void Timer0Isr() {  
static int count = 0;  
  count ++;  
  if (count >= 4 * 250) {  
    count = 0;  
    ::IOXF = !::IOXF;//郁闷~~~中断中ST1被保护~~~  
  }  
//  SREG->ST1 ^= (1 << ST1_XF);//本想在此翻转，无奈被迫移入主程序中  
/*
    if (::IOXF) { SREG->ST1 |= (1 << ST1_XF); } else { SREG->ST1 &= ~(1 << ST1_XF); } */ // TIMER0->TCR |= (1 << TCR_TSS);//turn off start timer 0 } interrupt void Timer1Isr() {//run only once TIMER1->TCR |= (1 << TCR_TSS);//turn off start timer 1 (self-destruction) }