59 lines
1.5 KiB
Python
59 lines
1.5 KiB
Python
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import string
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import time
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import serial
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from struct import *
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import time
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WRITE_CMD = 0x01
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READ_CMD = 0x02
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CLOSE_CMD = 0x03
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def write_b(uart, data):
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uart.write(pack('B',data))
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class Uart2Csr:
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def __init__(self, port, baudrate, debug=False):
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self.port = port
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self.baudrate = baudrate
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self.debug = debug
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self.uart = serial.Serial(port, baudrate, timeout=0.25)
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def read(self, addr, burst_length=1):
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write_b(self.uart, READ_CMD)
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write_b(self.uart, burst_length)
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write_b(self.uart, (addr & 0xff000000) >> 24)
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write_b(self.uart, (addr & 0x00ff0000) >> 16)
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write_b(self.uart, (addr & 0x0000ff00) >> 8)
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write_b(self.uart, (addr & 0x000000ff))
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values = []
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for i in range(burst_length):
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read = self.uart.read(1)
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val = int(read[0])
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if self.debug:
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print("RD %02X @ %08X" %(val, addr + 4*i))
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values.append(val)
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if burst_length == 1:
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return values[0]
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else:
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return values
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def write(self, addr, data):
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if isinstance(data, list):
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burst_length = len(data)
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else:
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burst_length = 1
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write_b(self.uart, WRITE_CMD)
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write_b(self.uart, burst_length)
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self.uart.write([(addr & 0xff000000) >> 24,
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(addr & 0x00ff0000) >> 16,
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(addr & 0x0000ff00) >> 8,
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(addr & 0x000000ff)])
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if isinstance(data, list):
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for i in range(len(data)):
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write_b(self.uart, data[i])
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if self.debug:
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print("WR %02X @ %08X" %(elt, addr + 4*i))
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else:
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write_b(self.uart, data)
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if self.debug:
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print("WR %02X @ %08X" %(data, addr))
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