add PWM test for ecap0 (P9_42) and ecap2 (P9_28)

Author: pdp7

source/c_pwm.c

@@ -318,15 +318,13 @@ BBIO_err pwm_setup(const char *key, float duty, float freq, int polarity)
         return BBIO_CAPE;
     }
     // Do pinmuxing
-    fprintf(stderr, "DEBUG: do pinmuxing: key=%s\n", key);
     if(!strcmp(key, "P9_28")) {
-        fprintf(stderr, "DEBUG: P9_28: use pwm2\n");
+        // ecap2 (P9_28) requires mode pwm2
+        // based on bonescript commit 23bf443 by Matthew West
         strncpy(pin_mode, "pwm2", PIN_MODE_LEN);
     } else {
-        fprintf(stderr, "DEBUG: use pwm\n");
         strncpy(pin_mode, "pwm", PIN_MODE_LEN);
     }
-    fprintf(stderr, "DEBUG: set_pin_mode(key=%s, pin_mode=%s)\n", key, pin_mode);
     set_pin_mode(key, pin_mode);
 
     // Get info for pwm

test/test_pwm_setup.py

@@ -48,6 +48,38 @@ def test_start_pwm(self):
         assert int(period) == 500000
         PWM.cleanup()
 
+    def test_start_pwm_ecap0(self):
+        print("test_start_pwm_ecap0\n");
+        PWM.cleanup()
+        PWM.start("P9_42", 0)
+        pwm_dir = get_pwm_dir()
+        assert os.path.exists(pwm_dir)
+        if kernel >= '4.1.0':
+            duty = open(pwm_dir + '/duty_cycle').read()
+        else:
+            duty = open(pwm_dir + '/duty').read()
+        period = open(pwm_dir + '/period').read()
+        assert int(duty) == 0
+        assert int(period) == 500000
+        PWM.cleanup()
+
+    # test not enabled as default as
+    # cape-universala overlay required
+    #def test_start_pwm_ecap2(self):
+        #print("test_start_pwm_ecap2\n");
+        #PWM.cleanup()
+        #PWM.start("P9_28", 0)
+        #pwm_dir = get_pwm_dir()
+        #assert os.path.exists(pwm_dir)
+        #if kernel >= '4.1.0':
+            #duty = open(pwm_dir + '/duty_cycle').read()
+        #else:
+            #duty = open(pwm_dir + '/duty').read()
+        #period = open(pwm_dir + '/period').read()
+        #assert int(duty) == 0
+        #assert int(period) == 500000
+        #PWM.cleanup()
+
     def test_start_pwm_with_polarity_one(self):
         PWM.cleanup()
         PWM.start("P9_14", 0, 2000, 1)