Hello,
Regarding this post I am able to read my encoder value correctly.
// STM32 TIM3 Encoder Decoder (PC.06:A PC.07:B) VLDiscovery - sourcer32@gmail.com
#include ''stm32F10x.h''
#include ''STM32vldiscovery.h''
/**************************************************************************************/
void RCC_Configuration(void)
{
// clock for GPIO and AFIO (for ReMap)
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_AFIO, ENABLE);
// clock for TIM3
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
}
/**************************************************************************************/
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
// PC.06 TIM3_CH1, PC.07 TIM3_CH2
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_PinRemapConfig( GPIO_FullRemap_TIM3, ENABLE ); // Map TIM3 to GPIOC
}
/**************************************************************************************/
void TIM3_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_Period = 65535; // Maximal
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
// TIM_EncoderMode_TI1: Counter counts on TI1FP1 edge depending on TI2FP2 level.
TIM_EncoderInterfaceConfig(TIM3, TIM_EncoderMode_TI1, TIM_ICPolarity_Rising, TIM_ICPolarity_Rising);
TIM_Cmd(TIM3, ENABLE);
}
/**************************************************************************************/
int main(void)
{
RCC_Configuration();
GPIO_Configuration();
TIM3_Configuration();
// TIM3->CNT contains current position
while(1)
{
Print(TIM3->CNT);
}
}
My problem appears when I want to know the direction and number of pulse in each direction.
For example if the counter value is zero and I change the encoder position (when the previous value is 0 )and the next value is 65532 I need to know to determine the pulse changes is 2. And if the first value is 0 and the next value is 2 how to determine the pulse and rotation direction. In addition I need to know if the previous value is 65530 and the next value is 2 how to determine the number of pulses and the direction while the value of my timer is between 0 to 65535.
This confused me. I will be grateful if you could help me in this issue.
