Only enable timer overflow detection if halt debugging is disables

In addition provide that information via command "inf"

src/main.c

@@ -145,6 +145,11 @@ static void command_inf(char *arg) {
 		default:         CDC_Device_SendString(&VirtualSerial_CDC_Interface, "e:v\r");   break;
 	}
 
+	if(timer_has_overflow_detection()) {
+		CDC_Device_SendString(&VirtualSerial_CDC_Interface, "o:ov e\r");
+	} else {
+		CDC_Device_SendString(&VirtualSerial_CDC_Interface, "o:ov d\r");
+	}
 
 	if(PREF->PCON & PREF_PCON_IBYP_Msk) {
 		CDC_Device_SendString(&VirtualSerial_CDC_Interface, "o:ic d\n");

src/timer.c

@@ -5,16 +5,32 @@
 #define CYCCNT_LIMIT (UINT32_MAX)
 #define CYCCNT_INT_COST 40
 
-static uint32_t overflow_counter = 0;
+static uint32_t overflow_counter   = 0;
+static bool     overflow_detection = false;
 
 void DebugMon_Handler() {
 	++overflow_counter;
 }
 
-void timer_init() {
+bool timer_has_overflow_detection() {
+	return overflow_detection;
+}
+
+bool timer_enable_overflow_detection() {
+	if(CoreDebug->DHCSR & CoreDebug_DHCSR_C_DEBUGEN_Msk) {
+		return false;
+	}
+
 	DWT->COMP0 = CYCCNT_LIMIT;
 	DWT->MASK0 = 2; // watch 4Bytes (uint32_t)
-	DWT->FUNCTION0 = DWT_FUNCTION_CYCMATCH_Msk | 0x4 /* watch DWT_CYCCNT */;
+	DWT->FUNCTION0 = DWT_FUNCTION_CYCMATCH_Msk | 0x4; // watch DWT_CYCCNT
+
+	overflow_detection = true;
+	return true;
+}
+
+void timer_init() {
+	timer_enable_overflow_detection();
 
 	DWT->CYCCNT  = 0; // reset the counter
 	DWT->CTRL |= DWT_CTRL_CYCCNTENA_Msk | DWT_CTRL_CYCEVTENA_Msk;

src/timer.h

 #ifndef __TIMER_H
 	#define __TIMER_H
 
+	#include <stdbool.h>
 	#include <stdint.h>
 
 	void     timer_init();
+	bool     timer_enable_overflow_detection();
+	bool     timer_has_overflow_detection();
 	void     timer_start();
 	uint64_t timer_stop();
 #endif /* __TIMER_H */

xmccomm.c

@@ -151,6 +151,8 @@ static void resp_inf(bool success, char *resp) {
 		printf("Frequency: %.2f%cHz", freq_dbl, prefixes[idx]);
 	} else if(rem = strsw(resp, "ic ")) {
 		printf("Instruction Cache: Currently %s", ('e' == *rem) ? "enabled" : "disabled");
+	} else if(rem = strsw(resp, "ov ")) {
+		printf("Timer Overflow Detection: Currently %s", ('e' == *rem) ? "enabled" : "disabled");
 	} else {
 		printf("Unparsed: %s", resp);
 	}