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- /*
- * main.c
- *
- * Created on: 2015年1月5日
- * Author: DSP28335
- */
- #include "main.h"
- void EPwmSetup();
- int main(void)
- {
- InitSysCtrl();
-
- EPwmSetup();
-
- DINT;
- InitPieCtrl();
- IER = 0x00;
- IFR = 0x00;
- InitPieVectTable();
- InitCpuTimers(); // For this example, only initialize the Cpu Timers
-
- ConfigCpuTimer(&CpuTimer0, 150, 500000);
- while(1)
- {
- ;
- }
- }
- #define PWM_CLK 10e3 // If diff freq. desired, change freq here.
- #define SP CPU_CLK/(2*PWM_CLK)
- #define TBCTLVAL 0x200E // Up-down cnt, timebase = SYSCLKOUT
- #define CPU_CLK 150e6
- void EPwmSetup()
- {
- InitEPwm1Gpio();
- EALLOW;
- EPwm1Regs.TBSTS.all=0;
- EPwm1Regs.TBPHS.half.TBPHS=0;
- EPwm1Regs.TBCTR=0;
- EPwm1Regs.CMPCTL.all=0x50; // Immediate mode for CMPA and CMPB
- EPwm1Regs.CMPA.half.CMPA =SP/2;
- EPwm1Regs.CMPB=0;
- EPwm1Regs.AQCTLA.all=0x60; // EPWMxA = 1 when CTR=CMPA and counter inc
- // EPWMxA = 0 when CTR=CMPA and counter dec
- EPwm1Regs.AQCTLB.all=0;
- EPwm1Regs.AQSFRC.all=0;
- EPwm1Regs.AQCSFRC.all=0;
- EPwm1Regs.DBCTL.all=0xb; // EPWMxB is inverted
- EPwm1Regs.DBRED=0;
- EPwm1Regs.DBFED=0;
- EPwm1Regs.TZSEL.all=0;
- EPwm1Regs.TZCTL.all=0;
- EPwm1Regs.TZEINT.all=0;
- EPwm1Regs.TZFLG.all=0;
- EPwm1Regs.TZCLR.all=0;
- EPwm1Regs.TZFRC.all=0;
- EPwm1Regs.ETSEL.all=0; // Interrupt when TBCTR = 0x0000
- EPwm1Regs.ETFLG.all=0;
- EPwm1Regs.ETCLR.all=0;
- EPwm1Regs.ETFRC.all=0;
- EPwm1Regs.PCCTL.all=0;
- EPwm1Regs.TBCTL.all=0x0010+TBCTLVAL; // Enable Timer
- EPwm1Regs.TBPRD=SP;
- EDIS;
- }
复制代码
我测量GPIO0和GPIO1都没有任何输出,都是低电平。板子是28335的最小系统。 |
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