arm - how to obtain a 100 hz square signal using pwm timer in lpc1114/333 -


i need please. new on arm. work on embedded project. in project using lpc1114 microchip , drv8821 drive stepper motor, need timer pwm square signal 100 hz. have been reading user manual lpc1114 , wrote code failed. code below please analyze code , me. stuck in project. abmotor step data sheet , project schematic pin 27 (pin 0_8)

#include "lpc11xx.h"  int main(void) {      //set 16 bit timer pwm operation     lpc_iocon->pio0_8         = (lpc_iocon->pio0_8 & ~(0x3ff)) | 0x2;     //set pin pwm use (sec 7.4.23)     lpc_syscon->sysahbclkctrl |= (1<<7);                                  //enable clock signal 16 bit timer0 (sec 3.5.14)     lpc_tmr16b0->pr           = 0x0;                                      //set prescaler max value, not used here (sec 18.7.4)     lpc_tmr16b0->mcr          = 0x10;                                     //set reset on counter match (sec 18.7.6)     lpc_tmr16b0->emr          |= 0x20;                                    //set pin 27 1 on match (sec 18.7.10)     lpc_tmr16b0->ccr          = 0;                                        //set timer mode (sec 18.7.11)     lpc_tmr16b0->pwmc         = 0x1;                                      //set channel 0 pwm mode (sec 18.7.12)     lpc_tmr16b0->mr1          = ???????;                                     //set value period (sec 18.7.7)     lpc_tmr16b0->mr0          = ??????;                                      //set value duty cycle (sec 18.7.7)     lpc_tmr16b0->tcr          |= 0x3;                                     //enable , reset counter (sec 18.7.2)     lpc_tmr16b0->tcr          &= ~(0x2);                                  //clear reset bit (sec 18.7.2)      while(1){                                                     //infinite loop     }     return 0 ; }

when write code , see dc 2,68v in pin 27 oscilloscope screen. need square signal 100hz in pin. please me. @ least dont know value assign instead of question marks(mr1 , mr0) in code adjust signal 100hz frequency.

best regards,


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