2017-07-09 06:16 PM
Hello,
I have set up an encoder interface using SPL stm32f10x_tim.h which blinks an LED every time the motor makes a revolution. I am wondering how I would go about getting direction data from a similar setup.
&sharpinclude 'stm32f10x_rcc.h'
&sharpinclude 'stm32f10x_gpio.h'&sharpinclude 'stm32f10x_tim.h'&sharpinclude 'misc.h'/* Private function prototypes -----------------------------------------------*/
static void TIM_Config(void);void TIM3_IRQHandler (void);/* Private functions ---------------------------------------------------------*//**
* @brief Main program. * @param None * @retval None */int main(void){/* TIM Configuration */
TIM_Config();/* Infinite loop */
while (1) { int status = TIM_GetCounter(TIM3); printf ('status = %d\r\n',status); }}/**
* @brief Configure the TIM pins and the TIM IRQ Handler. * @param None * @retval None */static void TIM_Config(void){ TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; NVIC_InitTypeDef NVIC_InitStructure; GPIO_InitTypeDef GPIO_InitStructure;/* TIM3 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);/* GPIOA clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOC, ENABLE);/* TIM1 channel 2 pin (PE.11) configuration */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_Init(GPIOC, &GPIO_InitStructure); /* Time base configuration */ TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; // 48 counts per revolution of the motor shaft & gear ratio 34:1 TIM_TimeBaseStructure.TIM_Period = 1632; // Initialize TIM3 TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);/* Set TIM3 to Encoder mode */
TIM_EncoderInterfaceConfig(TIM3, TIM_EncoderMode_TI12, TIM_ICPolarity_Rising, TIM_ICPolarity_Rising);/* TIM Interrupts enable */
TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);/* TIM3 enable counter */
TIM_Cmd(TIM3, ENABLE);/* Enable the TIM3 global Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure);}/*blink LED every revolution */
void TIM3_IRQHandler(void){ GPIO_WriteBit(GPIOC,GPIO_Pin_9,Bit_SET); for (int i = 0; i <100; i++); GPIO_WriteBit(GPIOC,GPIO_Pin_9,Bit_RESET); TIM_ClearITPendingBit(TIM3,TIM_IT_Update);}
#encoder #timer #stm32f100rb