cc3200: Fix UART tests after correcting uart.read() behaviour.

cc3200/mods/pybuart.c

@@ -65,7 +65,7 @@
  *******-***********************************************************************/
 #define PYBUART_FRAME_TIME_US(baud)             ((11 * 1000000) / baud)
 #define PYBUART_2_FRAMES_TIME_US(baud)          (PYBUART_FRAME_TIME_US(baud) * 2)
-#define PYBUART_RX_TIMEOUT_US(baud)             (PYBUART_2_FRAMES_TIME_US(baud))
+#define PYBUART_RX_TIMEOUT_US(baud)             (PYBUART_2_FRAMES_TIME_US(baud) * 8) // we need at least characters in the FIFO
 
 #define PYBUART_TX_WAIT_US(baud)                ((PYBUART_FRAME_TIME_US(baud)) + 1)
 #define PYBUART_TX_MAX_TIMEOUT_MS               (5)

tests/wipy/uart.py

@@ -54,7 +54,7 @@ print(uart1.read() == b'123456')
 print(uart1.write(b'123') == 3)
 print(uart0.read(1) == b'1')
 print(uart0.read(2) == b'23')
-print(uart0.read() == b'')
+print(uart0.read() == None)
 
 uart0.write(b'123')
 buf = bytearray(3)
@@ -79,28 +79,28 @@ uart0 = UART(0, 1000000, pins=('GP12', None))
 print(uart0.write(b'123456') == 6)
 print(uart1.read() == b'123456')
 print(uart1.write(b'123') == 3)
-print(uart0.read() == b'')
+print(uart0.read() == None)
 
 # rx only mode
 uart0 = UART(0, 1000000, pins=(None, 'GP13'))
 print(uart0.write(b'123456') == 6)
-print(uart1.read() == b'')
+print(uart1.read() == None)
 print(uart1.write(b'123') == 3)
 print(uart0.read() == b'123')
 
 # leave pins as they were (rx only mode)
 uart0 = UART(0, 1000000, pins=None)
 print(uart0.write(b'123456') == 6)
-print(uart1.read() == b'')
+print(uart1.read() == None)
 print(uart1.write(b'123') == 3)
 print(uart0.read() == b'123')
 
 # no pin assignemnt
 uart0 = UART(0, 1000000, pins=(None, None))
 print(uart0.write(b'123456789') == 9)
-print(uart1.read() == b'')
+print(uart1.read() == None)
 print(uart1.write(b'123456789') == 9)
-print(uart0.read() == b'')
+print(uart0.read() == None)
 print(Pin.board.GP12)
 print(Pin.board.GP13)
 
@@ -156,4 +156,3 @@ for uart_id in uart_id_range:
     uart.init(115200)
     print(uart)
     uart.read()
-