to solve the problem

sir i have written a program to get the delay of 700usec and 20usec i got the exact timing delay here my problem is i want 20usec pulse to be continued.i think u can understand when i paste my code.kindly suggest me how to get the 20usec continuously

#include "stm32f0xx.h"
#include "stm32f0308_Discovery.h"

#define in1 GPIO_Pin_1
#define in2 GPIO_Pin_2
#define in3 GPIO_Pin_3
#define in4 GPIO_Pin_4
#define in5 GPIO_Pin_5
#define in_GPIO GPIOA

#define out1 GPIO_Pin_1
#define out2 GPIO_Pin_2
#define out3 GPIO_Pin_3
#define out4 GPIO_Pin_4
#define out5 GPIO_Pin_5
#define out_GPIO GPIOC

void TM_Delay_Init(void);
void TM_DelayMillis(uint32_t millis);
void TM_DelayMillis1(uint32_t millis);

GPIO_InitTypeDef GPIO_InitStructure ;

int inval;
uint32_t multiplier;

int main(void)
{ SystemInit(); SystemCoreClockUpdate(); TM_Delay_Init();

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE); RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE);

/* Configure PA in input mode */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 ; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; // enable internal Pullup resistors on the GPIO pins GPIO_Init(GPIOA, &GPIO_InitStructure);

/*configure PC in output mode */

GPIOC->MODER |= (GPIO_MODER_MODER1_0) ; //GPIOC-> GPIO_MODER_MODER8_0 = 0x01; GPIOC->OTYPER &= ~(GPIO_OTYPER_OT_1) ; //GPIOC->OTYPER = 0x00; GPIOC->OSPEEDR |= (GPIO_OSPEEDER_OSPEEDR1); //GPIOC->OSPEEDR = 0x00; GPIOC->PUPDR &= ~(GPIO_PUPDR_PUPDR1);

while(1)
{

inval = GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0);//|GPIO_Pin_2|GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5);

if(inval==1) {

GPIO_SetBits(in_GPIO,in1); GPIO_SetBits(out_GPIO,out1); TM_DelayMillis(7); GPIO_ResetBits(in_GPIO, in1); GPIO_ResetBits(out_GPIO,out1); TM_DelayMillis(7);

/*20us delay*/ GPIO_SetBits(in_GPIO,in1); GPIO_SetBits(out_GPIO,out1); TM_DelayMillis1(20); GPIO_ResetBits(in_GPIO, in1); GPIO_ResetBits(out_GPIO,out1); TM_DelayMillis(20); } } }

void TM_DelayMillis(uint32_t millis) { /* Multiply millis with multipler */ /* Substract 10 */ millis = 100 * millis * multiplier - 10; /* 4 cycles for one loop */ while (millis--);
}

void TM_DelayMillis1(uint32_t millis) { /* Multiply millis with multipler */ /* Substract 10 */ millis = 1 * millis * multiplier - 10; /* 4 cycles for one loop */ while (millis--);
}

void TM_Delay_Init(void) { RCC_ClocksTypeDef RCC_Clocks;

/* Get system clocks */ RCC_GetClocksFreq(&RCC_Clocks);

/* While loop takes 4 cycles */ /* For 1 us delay, we need to divide with 4M */ multiplier = RCC_Clocks.HCLK_Frequency / 4000000;
}

kindly help me in repeting the 20usec