Spyros Papanastasiou / Mbed 2 deprecated General_purpose_timer_TIM2__custom_interrupt_handler

Using CMSIS NVIC functions to set custom timer interrupt handler.

Dependencies:   mbed

Diff: main.cpp

Revision:
3:db424769ecca
Parent:
2:7c45a714b991
Child:
4:c52637c8d084
--- a/main.cpp	Thu Aug 01 07:53:05 2019 +0000
+++ b/main.cpp	Fri Aug 02 04:16:14 2019 +0000
@@ -1,5 +1,5 @@
-#include <mbed.h>
-
+//#include <mbed.h>
+#include "stm32f303xe.h"
 #include <iostream>
 #include <iomanip>
 
@@ -10,7 +10,7 @@
 
 void inline enable_timer ()
 {
-    TIM2->CR1 = TIM_CR1_URS | TIM_CR1_CEN;
+    TIM2->CR1 |= TIM_CR1_ARPE | TIM_CR1_OPM | TIM_CR1_URS | TIM_CR1_CEN;
 }
 
 void inline enable_timer_interrupt ()
@@ -100,10 +100,21 @@
     toggle_LED();
 }
 
+void fun ()
+{
+    cout << "Interrupt hit!" << endl;
+    clear_timer_status();
+    toggle_LED();
+}
+
 inline void enable_interrupt ()
 {
-    NVIC_SetPriority(TIM2_IRQn, 255);
+    NVIC_SetPriority(TIM2_IRQn, 250);
+    cout << "TIM2_IRQn priority : " << NVIC_GetPriority(TIM2_IRQn) << endl;
     NVIC_EnableIRQ(TIM2_IRQn);
+    cout << "TIM2_IRQn status   : " << NVIC_GetEnableIRQ(TIM2_IRQn) << endl;
+    cout << "TIM2_IRQn pending  : " << NVIC_GetPendingIRQ(TIM2_IRQn) << endl;
+    NVIC_SetVector(TIM2_IRQn, (uint32_t) &fun);
 }
 
 //
@@ -119,20 +130,27 @@
     TIM2->CR1 = TIM2->CR2 = TIM2->SMCR = TIM2->DIER = TIM2->SR = TIM2->CCMR1 = TIM2->CCMR2
               = TIM2->CCER = TIM2->CNT = TIM2->PSC = TIM2->CCR1 = TIM2->CCR2 = TIM2->CCR3 
               = TIM2->CCR4 = TIM2->DCR = TIM2->DMAR = 0;
+    TIM2->CR1 |= TIM_CR1_UDIS;
     downscale_timer_max();
     limit_timer_counter_to(0x1000);
     // ^ LED stays open for 0.5 and closed for 0.5 with a total of 1 sec.
     // -
     clear_timer_status();
-//    enable_timer_interrupt();
+    enable_timer_interrupt();
     enable_timer();
     enable_interrupt();
     cout << "Exiting main().." << endl;
     cout << endl;
+        cout << hex
+             << "Status : 0x" << TIM2->SR << endl
+             << "Count  : 0x" << TIM2->CNT << endl;
+    TIM2->CR1 &= ~TIM_CR1_UDIS;
     while (true)
     {
         cout << hex
              << "Status : 0x" << TIM2->SR << endl
              << "Count  : 0x" << TIM2->CNT << endl;
+        if (TIM2->CNT > 2)
+            TIM2->SR = 0;
     }
 }
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