HW TEST - Timer (#6754)

* Added HW timer unit test

* Adde setUp and tearDown functions

tests/timer/test_timer.py

+def test_timer(dut):
+    dut.expect_unity_test_output(timeout=240)

tests/timer/timer.ino

+/* HW Timer test */
+#include <unity.h>
+
+#define TIMER_DIVIDER  16
+#define TIMER_SCALE    (APB_CLK_FREQ / TIMER_DIVIDER)
+
+hw_timer_t * timer = NULL;
+static volatile bool alarm_flag;
+
+/* These functions are intended to be called before and after each test. */
+void setUp(void) {
+  timer = timerBegin(0, TIMER_DIVIDER, true);
+  timerStop(timer);
+  timerRestart(timer);
+}
+
+void tearDown(void){
+  timerEnd(timer);
+}
+
+
+
+void ARDUINO_ISR_ATTR onTimer(){
+  alarm_flag = true;
+}
+
+
+void timer_interrupt_test(void){
+  
+  alarm_flag = false;
+  timerAttachInterrupt(timer, &onTimer, true);
+  timerAlarmWrite(timer, (1.2 * TIMER_SCALE), true);
+  timerAlarmEnable(timer);
+  timerStart(timer);
+  
+  delay(2000);
+
+  TEST_ASSERT_EQUAL(true, alarm_flag);
+
+  timerStop(timer);
+  timerRestart(timer);
+  alarm_flag = false;
+  timerAlarmDisable(timer);
+  timerStart(timer);
+
+  delay(2000);
+  TEST_ASSERT_EQUAL(false, alarm_flag);
+}
+
+void timer_divider_test(void){
+
+  uint64_t time_val;
+  uint64_t comp_time_val;
+
+  timerStart(timer);
+
+  delay(1000);
+  time_val = timerRead(timer);
+
+  // compare divider  16 and 8, value should be double
+  timerStop(timer);
+  timerSetDivider(timer,8);
+  timerRestart(timer);
+  timerStart(timer);
+
+  delay(1000);        
+  comp_time_val = timerRead(timer);
+    
+  TEST_ASSERT_INT_WITHIN(5000, 5000000, time_val);
+  TEST_ASSERT_INT_WITHIN(10000, 10000000, comp_time_val);
+
+  // divider is 256, value should be 2^4
+  timerStop(timer);
+  timerSetDivider(timer,256);
+  timerRestart(timer);
+  timerStart(timer);
+  delay(1000);       
+  comp_time_val = timerRead(timer);
+  TEST_ASSERT_INT_WITHIN(5000, 5000000, time_val);
+  TEST_ASSERT_INT_WITHIN(3126, 312500, comp_time_val);
+}
+
+void timer_read_test(void){
+
+  uint64_t set_timer_val = 0xFF;
+  uint64_t get_timer_val = 0;
+
+  timerWrite(timer,set_timer_val);
+  get_timer_val = timerRead(timer);
+
+  TEST_ASSERT_EQUAL(set_timer_val, get_timer_val);
+}
+
+void setup(){
+  
+  // Open serial communications and wait for port to open:
+  Serial.begin(115200);
+  while (!Serial) {
+    ;
+  }
+
+  UNITY_BEGIN();
+  RUN_TEST(timer_read_test);
+  RUN_TEST(timer_interrupt_test);
+  RUN_TEST(timer_divider_test);
+  UNITY_END();
+}
+
+void loop(){
+}