88 lines
2.2 KiB
Python
88 lines
2.2 KiB
Python
import serial
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from struct import *
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from litescope.host.driver.reg import *
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def write_b(uart, data):
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uart.write(pack('B',data))
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class LiteScopeUARTDriver:
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cmds = {
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"write" : 0x01,
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"read" : 0x02
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}
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def __init__(self, port, baudrate=115200, addrmap=None, busword=8, debug=False):
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self.port = port
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self.baudrate = str(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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self.regs = build_map(addrmap, busword, self.read, self.write)
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def open(self):
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self.uart.flushOutput()
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self.uart.close()
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self.uart.open()
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self.uart.flushInput()
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try:
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self.regs.uart2wb_sel.write(1)
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except:
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pass
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def close(self):
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try:
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self.regs.uart2wb_sel.write(0)
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except:
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pass
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self.uart.flushOutput()
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self.uart.close()
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def read(self, addr, burst_length=1):
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self.uart.flushInput()
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write_b(self.uart, self.cmds["read"])
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write_b(self.uart, burst_length)
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addr = addr//4
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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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val = 0
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for j in range(4):
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val = val << 8
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val |= ord(self.uart.read())
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if self.debug:
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print("RD %08X @ %08X" %(val, (addr+i)*4))
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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, self.cmds["write"])
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write_b(self.uart, burst_length)
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addr = addr//4
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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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if isinstance(data, list):
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for i in range(len(data)):
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dat = data[i]
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for j in range(4):
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write_b(self.uart, (dat & 0xff000000) >> 24)
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dat = dat << 8
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if self.debug:
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print("WR %08X @ %08X" %(data[i], (addr + i)*4))
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else:
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dat = data
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for j in range(4):
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write_b(self.uart, (dat & 0xff000000) >> 24)
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dat = dat << 8
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if self.debug:
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print("WR %08X @ %08X" %(data, (addr * 4)))
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