litex/misoclib/tools/litescope/host/driver/uart.py

89 lines
2.9 KiB
Python

import serial
from struct import *
from misoclib.tools.litescope.host.driver.reg import *
def write_b(uart, data):
uart.write(pack('B', data))
class LiteScopeUARTDriver:
cmds = {
"write" : 0x01,
"read" : 0x02
}
def __init__(self, port, baudrate=115200, addrmap=None, busword=8, debug=False):
self.port = port
self.baudrate = str(baudrate)
self.debug = debug
self.uart = serial.Serial(port, baudrate, timeout=0.25)
if addrmap is not None:
self.regs = build_map(addrmap, busword, self.read, self.write)
def open(self):
self.uart.flushOutput()
self.uart.close()
self.uart.open()
self.uart.flushInput()
try:
self.regs.uart2wb_sel.write(1)
except:
pass
def close(self):
try:
self.regs.uart2wb_sel.write(0)
except:
pass
self.uart.flushOutput()
self.uart.close()
def read(self, addr, burst_length=None, repeats=None):
datas = []
def to_int(v):
return 1 if v is None else v
for i in range(to_int(repeats)):
self.uart.flushInput()
write_b(self.uart, self.cmds["read"])
write_b(self.uart, burst_length)
write_b(self.uart, (addr//4 & 0xff000000) >> 24)
write_b(self.uart, (addr//4 & 0x00ff0000) >> 16)
write_b(self.uart, (addr//4 & 0x0000ff00) >> 8)
write_b(self.uart, (addr//4 & 0x000000ff))
for j in range(to_int(burst_length)):
data = 0
for k in range(4):
data = data << 8
data |= ord(self.uart.read())
if self.debug:
print("RD %08X @ %08X" %(data, (addr+j)*4))
datas.append(data)
return datas
def write(self, addr, data):
if isinstance(data, list):
burst_length = len(data)
else:
burst_length = 1
write_b(self.uart, self.cmds["write"])
write_b(self.uart, burst_length)
write_b(self.uart, (addr//4 & 0xff000000) >> 24)
write_b(self.uart, (addr//4 & 0x00ff0000) >> 16)
write_b(self.uart, (addr//4 & 0x0000ff00) >> 8)
write_b(self.uart, (addr//4 & 0x000000ff))
if isinstance(data, list):
for i in range(len(data)):
dat = data[i]
for j in range(4):
write_b(self.uart, (dat & 0xff000000) >> 24)
dat = dat << 8
if self.debug:
print("WR %08X @ %08X" %(data[i], (addr + i)*4))
else:
dat = data
for j in range(4):
write_b(self.uart, (dat & 0xff000000) >> 24)
dat = dat << 8
if self.debug:
print("WR %08X @ %08X" %(data, (addr * 4)))