pyserial_and_gpio_test.py

# Test the Cypress CY7C65213 GPIO Pins with simultaneous pyserial communication
# using Python 2.7 notation. Some of the following is deprecated in Python 3.0

# Before you run this test, use the Cypress USB-Serial Configuration Utility (under Windows) to:
#  Set UART RX Notification LED to "None"
#  Set UART TX Notification LED to "None"
#  Set UART RX or TX Notification LED to "GPIO_0"
#  Configure GPIO_1 as "Drive 0" (i.e. low output as default)
#  Configure GPIO_2 as "Input" (instead of "Tristate")

# Connect GPIO_1 to GPIO_2 using a jumper wire

# Connect TXD to RXD using a jumper wire
# Connect RTS to CTS using a jumper wire
# Connect DTR to DSR using a jumper wire

from cy7c65213 import CyUSBSerial, CyGPIO
import serial

# Windows COM port name (from Device Manager)
com_port = 'COM1'
# Linux tty name (e.g. Raspberry Pi)
#com_port = '/dev/ttyACM0'

# Point to the DLL provided by Cypress
# Windows
dll = "C:\\Program Files (x86)\\Cypress\\USB-Serial SDK\\library\\cyusbserial\\x64\\cyusbserial.dll"
# Linux (e.g. Raspberry Pi)
#dll = "/usr/local/lib/libcyusbserial.so"

# Load the DLL
lib = CyUSBSerial(lib = dll)

#dev = lib.find().next() # Use first device found
dev = lib.find(vid=0x04B4,pid=0x0003).next() # Look for a specific vendor and product id

# Access GPIO
gpio = CyGPIO(dev)

out_pin = gpio.pin(1) # GPIO Pin 1
in_pin = gpio.pin(2) # GPIO Pin 2

# Open serial port
ser = serial.Serial(com_port, 115200, timeout=1)

count = 0 # Initialise count

try:
    while(True): # Repeat until user presses Ctrl-C
        for x in [False,True]: # Alternate low and high
            ser.setRTS(x) # Set the RTS pin
            ser.setDTR(x) # Set the DTR pin
            out_pin.set(x) # Set the output pin
            ser.write('%05i'%count) # Write count to serial port
            print 'Received:',ser.read(100) # Try to read 100 characters forcing a timeout
            print 'CTS:',ser.getCTS() # Get CTS status
            print 'DSR:',ser.getDSR() # Get DSR status
            print 'Input pin:',in_pin.get() # Read the input pin
            print
            count += 1 # Increment count

except KeyboardInterrupt:
    print 'Ctrl-C received!'

finally:
    ser.close()
    print 'Bye!'