Replay UART

We highly encourage everyone to use our new Python package which is packed with features. This library is still supported, but is not recommended for new design.

The following script can be used to repeat UART streams captured and exported from Saleae Logic. After the capture is completed, export the Async Serial analyzer results as a csv file. You can follow this guide to export the file. The exported data should be in HEX-- Note that the base/radix of the exported data will match the current setting for display in the software.

Simply modify the parameters in lines 9-18 in the script below and then everything is ready to play back the file from the Binho Multi-Protocol USB Host Adapter.

For easy testing, here's an example export file from Saleae Logic that works with this script:

2KB

uart_9600.csv

from binhoHostAdapter import binhoHostAdapter
from binhoHostAdapter import binhoUtilities

from datetime import datetime, timedelta, time
import math
import csv


uartIndex = 0
uartBaudRate = 9600
uartDataBits = 8
uartParity = 'NONE'
uartStopBits = 1
uartEscapeString = "+++UART0"

captureExportFile = 'C:\\Users\\Batman\\Desktop\\LogicExports\\uart_9600.csv'

binhoCommPort = 'COM27'


# ---- No Need to Change Anything Below Here ----

print("Opening " + binhoCommPort + "...")
print()

# create the binhoHostAdapter object
binho = binhoHostAdapter.binhoHostAdapter(binhoCommPort)

print("Connecting to binho host adapter...")
print()

print("Connected!")
print()
binho.setLEDColor('YELLOW')

print("Setting UART bus parameters:")
print()
binho.setOperationMode(0, 'UART')

print('BaudRate: ' + str(uartBaudRate))
binho.setBaudRateUART(uartIndex, uartBaudRate)

print('Databits: ' + str(uartDataBits))
binho.setDataBitsUART(uartIndex, uartDataBits)

print('Parity Bit: ' + str(uartParity))
binho.setParityUART(uartIndex, uartParity)

print('Stop Bits: ' + str(uartStopBits))
binho.setStopBitsUART(uartIndex, uartStopBits)

binho.setEscapeSequenceUART(uartIndex, uartEscapeString)

print()
print("Computing USB Transit time...")
t0 = datetime.now()
binho.ping()
binho.ping()
binho.ping()
binho.ping()
binho.ping()
t1 = datetime.now()

avgUSBTxTime = (t1 - t0)/5
print('Average USB Tx Time = ' + str(avgUSBTxTime) + 's')
print()


print("Beginning Replay...")
print()
binho.beginBridgeUART(uartIndex)

with open(captureExportFile) as captureExport:
	capture_reader = csv.reader(captureExport, delimiter=',')
	rowCount = 0

	startTime = datetime.now()
	prevTimestamp = startTime
	prevRowTime = 0
	
	for row in capture_reader:

		if rowCount == 0:

			# These are the column headers, just advance to the next row
			rowCount += 1
			print('Row#\tTimestamp\t\t\t\tData')

		else:

			currRowTime = float(row[0])
			payload = int(row[1], 16)

			deltaTimems = (currRowTime - prevRowTime) * 1000
			#deltaTimems = 0.125 * 1000
			#print('DeltaT: ' + str(deltaTimems))
			#print('computed delta: ' + str(timedelta(0,0,0,math.floor(deltaTimems))))

			while (datetime.now() - prevTimestamp) < timedelta(0,0,0,math.floor(deltaTimems)):
				#nothing, sleep does not have high enough resolution
				# print('WAITING ' + str(datetime.now() - prevTimestamp))
				pass

			binho.writeBridgeUART(chr(payload))
			prevTimestamp = datetime.now()
			prevRowTime = currRowTime

			print(str(rowCount) + '\t' + str(prevTimestamp) + '\t\t' + str(payload))

			rowCount += 1

binho.stopBridgeUART(uartEscapeString)
binho.ping()
print('Finished Replaying...')
print()
binho.setLEDColor('BLUE')
binho.close()
print('Goodbye!')