Posted on July 09, 2015 at 22:13Hi, I am using the discovery board to try OPM on timer 2. I can not get it going with any effort on my code list below. Please help!!! It is important to our new product.
void GPIO_Configuration(void);
int main(void)
{
/* System Clocks Configuration */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA|RCC_AHBPeriph_GPIOC, ENABLE);
RCC_APB1PeriphResetCmd(RCC_APB1Periph_TIM2, ENABLE);
/* Configure the GPIO ports */
GPIO_Configuration();
/* TIM2 configuration: One Pulse mode ------------------------
The external signal is connected to TIM2_CH2 pin (PA.01),
The Rising edge is used as active edge,
The One Pulse signal is output on TIM2_CH1 pin (PA.00)
The TIM_Pulse defines the delay value
The (TIM_Period - TIM_Pulse) defines the One Pulse value.
The TIM2CLK is fixed to 72 MHz, the Prescaler is 1, so the
TIM2 counter clock is 36 MHz.
The Autoreload value is 65535 (TIM2->ARR), so the maximum
frequency value to trigger the TIM2 input is 500 Hz.
The TIM_Pulse defines the delay value, the delay value is fixed
to 455.08 us:
delay = CCR1/TIM2 counter clock = 455.08 us.
The (TIM_Period - TIM_Pulse) defines the One Pulse value,
the pulse value is fixed to 1.365ms:
One Pulse value = (TIM_Period - TIM_Pulse)/TIM2 counter clock = 1.365 ms.
------------------------------------------------------------ */
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 65535;
TIM_TimeBaseStructure.TIM_Prescaler = 1;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
/* TIM2 PWM2 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 16383; //delay..
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OC2Init(TIM2, &TIM_OCInitStructure); //PA1 output.
/* TIM2 PWM2 Mode configuration: Channel3 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 1; //No delay, immediate reacts to input.
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OC3Init(TIM2, &TIM_OCInitStructure); //PA2 output.
/* TIM2 configuration in Input Capture Mode */
TIM_ICStructInit(&TIM_ICInitStructure);
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1; //PA0 trigger
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0;
TIM_ICInit(TIM2, &TIM_ICInitStructure);
/* One Pulse Mode selection */
TIM_SelectOnePulseMode(TIM2, TIM_OPMode_Single);
/* Input Trigger selection */
TIM_SelectInputTrigger(TIM2, TIM_TS_TI1FP1);
/* Slave Mode selection: Trigger Mode */
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Trigger);
//GPIO_SetBits(GPIOA,GPIO_Pin_1);
while (1)
{
GPIO_SetBits(GPIOC,GPIO_Pin_8|GPIO_Pin_9); //Turn 2 leds on.
}
}
///////////////////////////////////////////////////
void GPIO_Configuration(void)
{
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_9; //PC8,9 to be output pp.
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource0,GPIO_AF_2);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource1,GPIO_AF_6);
GPIO_PinAFConfig(GPIOA,GPIO_PinSource2,GPIO_AF_6);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2; //PA2 to be alternative func.
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; //PA0 to be alternative func.
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
