Diff: counter.cpp

Revision:

0:6adab3889554

Child:

1:3d22d4e6de38

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/counter.cpp	Tue Sep 29 14:05:36 2015 +0000
@@ -0,0 +1,26 @@
+// reference this code http://www.fmf.uni-lj.si/~ponikvar/STM32F407%20project/Timer2_Counting.pdf
+#include "mbed.h"
+#include "stm32f4xx.h"
+
+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
+
+ 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
+
+ while (1) {
+        int16_t count1;
+        count1=TIM2->CNT; //OK 401 411 TICKER 030
+
+        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
+ };
+} 
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