82 lines
2.1 KiB
Python
82 lines
2.1 KiB
Python
import string
|
|
import time
|
|
import serial
|
|
from struct import *
|
|
import time
|
|
from migen.fhdl.structure import *
|
|
|
|
WRITE_CMD = 0x01
|
|
READ_CMD = 0x02
|
|
CLOSE_CMD = 0x03
|
|
|
|
def write_b(uart, data):
|
|
uart.write(pack('B',data))
|
|
|
|
class Uart2Csr:
|
|
def __init__(self, port, baudrate, debug=False):
|
|
self.port = port
|
|
self.baudrate = baudrate
|
|
self.debug = debug
|
|
self.uart = serial.Serial(port, baudrate, timeout=0.25)
|
|
|
|
def read(self, addr, burst_length=1):
|
|
write_b(self.uart, READ_CMD)
|
|
write_b(self.uart, burst_length)
|
|
write_b(self.uart, (addr & 0xff000000) >> 24)
|
|
write_b(self.uart, (addr & 0x00ff0000) >> 16)
|
|
write_b(self.uart, (addr & 0x0000ff00) >> 8)
|
|
write_b(self.uart, (addr & 0x000000ff))
|
|
values = []
|
|
for i in range(burst_length):
|
|
read = self.uart.read(1)
|
|
val = int(read[0])
|
|
if self.debug:
|
|
print("RD %02X @ %08X" %(val, addr + 4*i))
|
|
values.append(val)
|
|
if burst_length == 1:
|
|
return values[0]
|
|
else:
|
|
return values
|
|
|
|
def read_n(self, addr, n, endianess = "LE"):
|
|
r = 0
|
|
words = int(2**bits_for(n-1)/8)
|
|
for i in range(words):
|
|
if endianess == "BE":
|
|
r += self.read(addr+i)<<(8*i)
|
|
elif endianess == "LE":
|
|
r += self.read(addr+words-1-i)<<(8*i)
|
|
if self.debug:
|
|
print("RD @ %04X" %addr)
|
|
return r
|
|
|
|
def write(self, addr, data):
|
|
if isinstance(data, list):
|
|
burst_length = len(data)
|
|
else:
|
|
burst_length = 1
|
|
write_b(self.uart, WRITE_CMD)
|
|
write_b(self.uart, burst_length)
|
|
self.uart.write([(addr & 0xff000000) >> 24,
|
|
(addr & 0x00ff0000) >> 16,
|
|
(addr & 0x0000ff00) >> 8,
|
|
(addr & 0x000000ff)])
|
|
if isinstance(data, list):
|
|
for i in range(len(data)):
|
|
write_b(self.uart, data[i])
|
|
if self.debug:
|
|
print("WR %02X @ %08X" %(elt, addr + 4*i))
|
|
else:
|
|
write_b(self.uart, data)
|
|
if self.debug:
|
|
print("WR %02X @ %08X" %(data, addr))
|
|
|
|
def write_n(self, addr, data, n, endianess = "LE"):
|
|
words = int(2**bits_for(n-1)/8)
|
|
for i in range(words):
|
|
if endianess == "BE":
|
|
self.write(addr+i, (data>>(8*i)) & 0xFF)
|
|
elif endianess == "LE":
|
|
self.write(addr+words-1-i, (data>>(8*i)) & 0xFF)
|
|
if self.debug:
|
|
print("WR %08X @ %04X" %(data, addr)) |