Posted on July 19, 2011 at 17:47Hi,
I am trying to produce PWM signal by using
TIM17 channel1 on PORTB-9,
but i can't get the PWM signal.
In debug mode i can see that TIM17 COUNTER register advanced and do overloop, but i just cant see the PWM signal on PORTB-9.
I configured RCC, GPIO and TIM (in this order as seen below).
Can any one give a hand?
THanks!
/************************************RCC***************************************************
/* Setup the microcontroller system. Initialize the Embedded Flash Interface,
initialize the PLL and update the SystemFrequency variable. */
SystemInit();
/*Configures the AHB clock (HCLK).*/
RCC_HCLKConfig(RCC_SYSCLK_Div2);
/*Configures the Low Speed APB clock (PCLK1).*/
RCC_PCLK1Config(RCC_HCLK_Div1);
/* Enable DMA1 clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
/* Enable ADC1-Periph, and ADC-GPIO (as defined in MW_hw.h) clocks */
RCC_APB2PeriphClockCmd( RCC_APB2Periph_TIM17 |
RCC_APB2Periph_GPIOB , ENABLE );
/************************************GPIO***************************************************
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_Init(MW_CONTROL_GPIO, &GPIO_InitStructure);
/************************************TIM17**************************************************
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 11999; TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM17, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse =11999*20/100; //20%
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1PreloadConfig(TIM17, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM17, ENABLE);
TIM_Cmd(TIM17, ENABLE);
// Enable PWM signal.
TIM_CCxCmd(TIM17, TIM_Channel_1, TIM_CCx_Enable);
#tim17 #tim-15-16-17-pwm
