I have STM32Primer2. I the layman in architecture of this system. I should measure duration of impulses coming on input IRDA (PORTA-> PA10). For what I wished to use TIM1. I have got confused in these 4 channel what of them is connected to input PA10. How correctly to initialize the timer 1 in a capture mode. Here my program but it works not correctly reads always 0:
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/* Configure PA.10 as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// GPIO_PinRemapConfig(GPIO_PartialRemap_TIM1,ENABLE);
/* Configure GPIO_D Pin 8 = CS Irda */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOD, &GPIO_InitStructure);
// CS Irda = 1
GPIO_ResetBits(GPIOD, GPIO_Pin_8);
OldPLLFreq = UTIL_GetPll ();
//Enable clock
RCC_APB2PeriphClockCmd(
RCC_APB2Periph_GPIOA |
RCC_APB2Periph_GPIOD |
RCC_APB2Periph_TIM1 |
RCC_APB2Periph_AFIO |
RCC_APB2Periph_USART1, ENABLE);
UTIL_SetPll ( SPEED_VERY_HIGH );
TI3_Config(TIM1,TIM_ICPolarity_Falling,TIM_ICSelection_DirectTI,0x03);
TIM_SetIC3Prescaler(TIM1,TIM_ICPSC_DIV1);
vu16 bpinput=0;
//Begin synchronisation
do
{
bpinput = (GPIOA->IDR)& ( GPIO_Pin_10 );
}while (bpinput);
//Start measurement
uint16_t tmp = 0;
do
{
}while (!TIM_GetFlagStatus(TIM1, TIM_FLAG_CC3));
//end measurement
tmp=TIM_GetCapture3(TIM1);//this capture time???
TIM_ClearFlag(TIM1, TIM_FLAG_CC3);
UTIL_uint2str( str, tmp , 6, 0 );
DRAW_DisplayString(15,50,str,6);
DRAW_SetTextColor(RGB_BLACK);
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Where my error?
How it is necessary to do?
Whether eats examples?
Help please.
Regards,
Farkhat
Last edited by Fakhad (2009-10-19 06:51:16)
