Diff: main.cpp

Revision:

0:ee5cb967aa17

Child:

1:cd7b42c99ff8

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sat Jan 10 20:06:07 2015 +0000
@@ -0,0 +1,60 @@
+/*
+ * Using STM32's counter peripherals to interface rotary encoders.
+ * Encoders are supported on F4xx's TIM1,2,3,4,5. TIM2 & TIM5 have 32bit count, others 16bit.
+ * Beware mbed uses TIM5 for system timer, others for PWM.
+ * Check your platform's PeripheralPins.c & PeripheralNames.h if you need both PWM & encoders.
+ *
+ * Edit HAL_TIM_Encoder_MspInitFx.cpp to suit your mcu & board's available pinouts & pullups/downs.
+ *
+ * Thanks to:
+ * http://petoknm.wordpress.com/2015/01/05/rotary-encoder-and-stm32/
+ *
+ * References:
+ * http://www.st.com/st-web-ui/static/active/en/resource/technical/document/user_manual/DM00122015.pdf
+ * http://www.st.com/st-web-ui/static/active/en/resource/technical/document/reference_manual/DM00096844.pdf
+ * http://www.st.com/web/en/resource/technical/document/application_note/DM00042534.pdf
+ * http://www.st.com/web/en/resource/technical/document/datasheet/DM00102166.pdf
+ * 
+ * David Lowe Jan 2015
+ */
+
+#include "mbed.h"
+#include "Encoder.h"
+
+TIM_Encoder_InitTypeDef encoder1, encoder2, encoder3, encoder4;
+TIM_HandleTypeDef timer1, timer2, timer3, timer4;
+
+int main()
+{
+    //examples
+    
+    //counting on A-input only, 2 ticks per cycle, rolls over at 100
+    EncoderInit(encoder1, timer1, TIM1, 99, TIM_ENCODERMODE_TI1);
+    
+    //counting on both A&B inputs, 4 ticks per cycle, full 32-bit count
+    EncoderInit(encoder2, timer2, TIM2, 0xffffffff, TIM_ENCODERMODE_TI12);
+
+    //counting on B-input only, 2 ticks per cycle, full 16-bit count
+    EncoderInit(encoder3, timer3, TIM3, 0xffff, TIM_ENCODERMODE_TI2);
+    
+    //counting on both A&B inputs, 4 ticks per cycle, full 16-bit count
+    EncoderInit(encoder4, timer4, TIM4, 0xffff, TIM_ENCODERMODE_TI12);
+    
+    //TIM5 is used by mbed for systick
+    //EncoderInit(encoder2, timer2, TIM5, 0xffffffff, TIM_ENCODERMODE_TI12);
+    
+    printf("STM HAL encoder demo\n\r");
+    
+    while(1) {
+        int16_t count1=0, count3=0, count4=0;
+        int32_t count2=0, count5=0;
+        
+        count1=TIM1->CNT; //OK 401 411 TICKER 030
+        count2=TIM2->CNT; //OK 401 411 N/A 030
+        count3=TIM3->CNT; //OK 401 411 030
+        count4=TIM4->CNT; //OK 401 NOK 411 N/A 030
+        count5=TIM5->CNT; //TICKER 401 411 N/A 030
+        printf("%d %d %d %d %d\r\n", count1, count2, count3, count4, count5);
+        wait(1.0);
+    }
+}