Posted on July 15, 2013 at 15:03
this is my code:
Hi,
I'm working with STM3220G. I have to create a project that: configure GPIOA(pin1) in output for 20msec. After 20msec, starts a PWM for 5msecand so on... My problem is: when I see in myosciloscope, the waveform are not aligned. The situation is:
this is my code:
#include <
stdio.h
>
#include ''stm32f2xx.h''
#include <
RTL.h
>
#include ''stm32f2xx_rcc.h''
#include ''stm32f2xx_tim.h''
#include ''stm32f2xx_gpio.h''
#include ''gpioInit.h''
#include ''timInit.h''
#define STARTPWM 1
#define STOPPWM 0
#define CONFSTART 1
#define CONFPWM 2
int start = 0;
unsigned int counterTimeStart = 0;
unsigned int counterTimePwm = 0;
unsigned int counterEndPeriod = 0;
int number_of_steps = 5;
int current_step = 0;
int count = 0;
short int doPwm = 0;
OS_TID t_clock;
OS_TID t_start;
OS_TID t_pwm;
/**************************************************************************************/
/**************************************************************************************/
void RCC_Configuration(void)
{
/* --------------------------- System Clocks Configuration -----------------*/
/* TIM2 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
/* GPIOA clock enable */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
}
/**************************************************************************************/
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_ClearPendingIRQ(TIM2_IRQn);
/* Enable the TIM1 gloabal Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
//NVIC_SetPriority(SysTick_IRQn, 2);
//NVIC_SetPriority(TIM2_IRQn, 4);
}
/**************************************************************************************/
/**************************************************************************************/
void TIM2_Configuration(void)
{
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
/* Time base configuration - SystemCoreClock = 120000000 for 120 MHz board */
TIM_TimeBaseStructure.TIM_Prescaler = (uint16_t) (((SystemCoreClock / 1000000) / 2) - 1); // Shooting for 1 MHz, (1us)
TIM_TimeBaseStructure.TIM_Period = 1000 - 1; // 1 MHz / 20000 = 50 Hz (20ms)
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
/* Enable TIM2 Preload register on ARR */
TIM_ARRPreloadConfig(TIM2, ENABLE);
/* TIM PWM1 Mode configuration: Channel */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 500; // Servo Top-Center
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
/* Output Compare PWM1 Mode configuration: Channel2 PA.1 */
TIM_OC2Init(TIM2, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable);
/* TIM2 Interrupts enable */
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
/* TIM2 enable counter */
TIM_Cmd(TIM2, ENABLE);
}
/**************************************************************************************/
void GPIO_Configuration(int mode)
{
GPIO_InitTypeDef GPIO_InitStructure;
if(mode == 1){
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIOA->ODR = 0x0002;
}else{
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource1, GPIO_AF_TIM2); // PA1 TIM2_CH2
}
}
void TIM2_IRQHandler(void)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
//START
if((current_step == 20) && (doPwm == 0)){
//doPwm = 1;
isr_evt_set(0x0001, t_start);
}
//PWM
if((current_step == number_of_steps) && (doPwm == 2)){
//doPwm = 3;
isr_evt_set(0x0002, t_pwm);
}
current_step++;
}
__task void starts(void){
for(;;){
os_evt_wait_and(0x0001, 0xffff);
TIM_Cmd(TIM2, DISABLE);
GPIO_Configuration(CONFPWM);
current_step = 0;
doPwm = 2;
TIM_Cmd(TIM2, ENABLE);
}
}
__task void pwm(void){
for(;;){
os_evt_wait_and(0x0002, 0xffff);
GPIO_Configuration(CONFSTART);
TIM_Cmd(TIM2, DISABLE);
doPwm = 0;
current_step = 0;
TIM_Cmd(TIM2, ENABLE);
}
}
__task void init(void){
t_start = os_tsk_create(starts,1);
t_pwm = os_tsk_create(pwm,1);
os_tsk_delete_self ();
}
int main(void)
{
RCC_Configuration();
NVIC_Configuration();
TIM2_Configuration();
GPIO_Configuration(CONFSTART);
os_sys_init(init);
while(1)
{
}
}
