Diff: counter.cpp

Revision:

2:6f1807a35656

Parent:

1:3d22d4e6de38

Child:

3:8c3e5f30cb6d

--- a/counter.cpp	Tue Sep 29 14:10:53 2015 +0000
+++ b/counter.cpp	Wed Oct 07 05:50:07 2015 +0000
@@ -1,26 +1,57 @@
-// reference this code http://www.fmf.uni-lj.si/~ponikvar/STM32F407%20project/Timer2_Counting.pdf
+
 #include "mbed.h"
 #include "stm32f4xx.h"
+#include "stm32f4xx_hal_tim_ex.h"
+
+TIM_HandleTypeDef timer;
+TIM_Encoder_InitTypeDef encoder;
+
+//direction to PA_9 -- step to PA_8
 
 int main(){
- RCC->AHB1ENR |= 0x01 + 0x10; // Clock for PortA, E
- RCC->APB1ENR |= 0x01; // Clock for Timer2
- GPIOA->MODER |= 0x00000008; // all inputs but: PA1 => AF mode
- GPIOA->AFR[0] |= 0x00000010; // select AF1 (TIM2) for PA01 -> TIM2_CH2
+     GPIO_InitTypeDef GPIO_InitStruct;
+        __TIM1_CLK_ENABLE();
+        __GPIOA_CLK_ENABLE();
+        GPIO_InitStruct.Pin = GPIO_PIN_8 | GPIO_PIN_9;
+        GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+        GPIO_InitStruct.Pull = GPIO_PULLDOWN;
+        GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
+        GPIO_InitStruct.Alternate = GPIO_AF1_TIM1;
+        HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+        
+    timer.Instance = TIM1;
+    timer.Init.Period = 0xffff;
+    timer.Init.Prescaler = 1;
+    timer.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
+    timer.Init.CounterMode = TIM_COUNTERMODE_UP;
+     
+    HAL_TIM_Base_Init(&timer);
+   
+    encoder.EncoderMode = TIM_ENCODERMODE_TI1; 
+    encoder.IC1Filter = 0x0f;
+    encoder.IC1Polarity = TIM_INPUTCHANNELPOLARITY_RISING; //step signal
+    encoder.IC1Prescaler = TIM_ICPSC_DIV1;
+    encoder.IC1Selection = TIM_ICSELECTION_DIRECTTI;
 
- TIM2->CCMR1 |= 0x0100; // Ch. 2 as TI2
- TIM2->SMCR |= 0x0007; // Ext. clk mode 1
- TIM2->SMCR |= 0x0060; // TI2FP2 as ext. clock
- TIM2->CR1 |= 0x0001; // enable counting
+    encoder.IC2Filter = 0x0f;
+    encoder.IC2Polarity = TIM_INPUTCHANNELPOLARITY_BOTHEDGE;  //check direction  
+    encoder.IC2Prescaler = TIM_ICPSC_DIV1;
+    encoder.IC2Selection = TIM_ICSELECTION_INDIRECTTI;
+ 
+    HAL_TIM_Encoder_Init(&timer, &encoder);
+    HAL_TIM_Encoder_Start(&timer,TIM_CHANNEL_1);   
+
+    
+    TIM1->EGR = 1;           // Generate an update event
+    TIM1->CR1 = 1;           // Enable the counter
+
 
  while (1) {
         int16_t count1;
-        count1=TIM2->CNT; 
+        count1=TIM1->CNT; 
 
         printf("%d\r\n", count1);
         wait(1.0);
- if (GPIOE->IDR & 0x01) TIM2->CNT = 0; // reset counter
- if (GPIOE->IDR & 0x02) TIM2->CR1 |= 0x01; // enable counter
- if (GPIOE->IDR & 0x04) TIM2->CR1 &= ~0x01; // disable counter
+
  };
 } 
\ No newline at end of file