76 lines
2.3 KiB
Python
76 lines
2.3 KiB
Python
import serial
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from struct import *
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from misoc.com.uart.software.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 UARTWishboneBridgeDriver:
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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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if addrmap is not None:
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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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def close(self):
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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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datas = []
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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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word_addr = addr//4
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write_b(self.uart, (word_addr >> 24) & 0xff)
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write_b(self.uart, (word_addr >> 16) & 0xff)
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write_b(self.uart, (word_addr >> 8) & 0xff)
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write_b(self.uart, (word_addr >> 0) & 0xff)
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for i in range(burst_length):
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data = 0
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for k in range(4):
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data = data << 8
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data |= ord(self.uart.read())
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if self.debug:
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print("RD {:08X} @ {:08X}".format(data, addr + 4*i))
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datas.append(data)
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if burst_length == 1:
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return datas[0]
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else:
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return datas
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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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data = [data]
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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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word_addr = addr//4
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write_b(self.uart, (word_addr >> 24) & 0xff)
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write_b(self.uart, (word_addr >> 16) & 0xff)
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write_b(self.uart, (word_addr >> 8) & 0xff)
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write_b(self.uart, (word_addr >> 0) & 0xff)
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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 >> 24) & 0xff)
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dat = dat << 8
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if self.debug:
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print("WR {:08X} @ {:08X}".format(data[i], addr + 4*i))
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