Fix: Use realistic static frequencies (100kHz/500kHz) with comments (Fixes #270)

Author: tejaspadole1-max

tests/test_spi.py

@@ -30,7 +30,8 @@
 CS = "LA3"
 SPIMaster._primary_prescaler = PPRE = 0
 SPIMaster._secondary_prescaler = SPRE = 0
-PWM_FREQUENCY = 1000
+# Static value 100kHz used because instance property '_frequency' cannot be accessed on the class.
+PWM_FREQUENCY = 100000.0
 MICROSECONDS = 1e-6
 RELTOL = 0.05
 # Number of expected logic level changes.

tests/test_uart.py

@@ -16,7 +16,8 @@
 WRITE_DATA = 0x55
 TXD2 = "LA1"
 RXD2 = "SQ1"
-PWM_FREQUENCY = 1000
+# Static value 500kHz (half of default 1MHz baudrate) used as instance property cannot be accessed here.
+PWM_FREQUENCY = 500000.0
 MICROSECONDS = 1e-6
 RELTOL = 0.05
 # Number of expected logic level changes.