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comm_serial: cleanup

This commit is contained in:
Sebastien Bourdeauducq 2014-12-02 11:09:02 +08:00
parent 20adb57140
commit 94218f785e
2 changed files with 28 additions and 46 deletions
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60
artiq/coredevice/comm_serial.py
View File

@ -22,7 +22,7 @@ class _H2DMsgType(Enum):
REQUEST_IDENT = 1
LOAD_OBJECT = 2
RUN_KERNEL = 3
UART_SET_BDRATE = 4
SET_BAUD_RATE = 4
class _D2HMsgType(Enum):
@ -59,32 +59,9 @@ class Comm:
def __init__(self, dev="/dev/ttyUSB1", baud=115200):
self._fd = os.open(dev, os.O_RDWR | os.O_NOCTTY)
self.port = os.fdopen(self._fd, "r+b", buffering=0)
self.dev = dev
real_baud = baud
baud = 115200
self.set_baud(baud)
if real_baud != baud:
baud = real_baud
self.set_baud(115200)
self.set_remote_baud(baud)
self.set_baud(baud)
self.current_baud = baud
def set_remote_baud(self, baud):
clk_freq = 80000000
_write_exactly(self.port, struct.pack(
">lbl", 0x5a5a5a5a, _H2DMsgType.UART_SET_BDRATE.value,
int((baud/clk_freq)*2**32)))
handshake = 0
while handshake < 4:
recv = struct.unpack(
"B", _read_exactly(self.port, 1))
if recv[0] == 0x5a:
handshake += 1
else:
logger.debug("SYNC ERR {:02x}\n".format(int(recv[0])))
handshake = 0
self.set_baud(baud)
logger.debug("Synchronized")
def set_baud(self, baud):
iflag, oflag, cflag, lflag, ispeed, ospeed, cc = \
@ -101,12 +78,27 @@ class Comm:
termios.tcdrain(self._fd)
termios.tcflush(self._fd, termios.TCOFLUSH)
termios.tcflush(self._fd, termios.TCIFLUSH)
logger.debug("connected to {} at {} baud".format(self.dev, baud))
logger.debug("baud rate set to".format(baud))
def set_remote_baud(self, baud):
_write_exactly(self.port, struct.pack(
">lbl", 0x5a5a5a5a, _H2DMsgType.SET_BAUD_RATE.value, baud))
handshake = 0
while handshake < 4:
recv = struct.unpack(
"B", _read_exactly(self.port, 1))
if recv[0] == 0x5a:
handshake += 1
else:
# FIXME: when loading immediately after a board reset,
# we erroneously get some zeros back.
logger.warning("unexpected sync character: {:02x}".format(int(recv[0])))
handshake = 0
self.set_baud(baud)
logger.debug("synchronized")
def close(self):
if self.current_baud != 115200:
self.set_remote_baud(115200)
self.set_baud(115200)
self.port.close()
def __enter__(self):
@ -116,20 +108,8 @@ class Comm:
self.close()
def _get_device_msg(self):
while True:
# FIXME: when loading immediately after a board reset,
# we erroneously get some zeros back.
# Ignore them with a warning for now.
spurious_zero_count = 0
while True:
(reply, ) = struct.unpack("B", _read_exactly(self.port, 1))
if reply == 0:
spurious_zero_count += 1
else:
break
if spurious_zero_count:
logger.warning("received {} spurious zeros".format(
spurious_zero_count))
msg = _D2HMsgType(reply)
if msg == _D2HMsgType.LOG:
(length, ) = struct.unpack(">h", _read_exactly(self.port, 2))

8
soc/runtime/comm_serial.c
View File

@ -10,7 +10,7 @@ enum {
MSGTYPE_REQUEST_IDENT = 1,
MSGTYPE_LOAD_OBJECT,
MSGTYPE_RUN_KERNEL,
MSGTYPE_UART_SETBDRATE,
MSGTYPE_SET_BAUD_RATE,
};
/* device to host */
@ -162,8 +162,10 @@ void comm_serve(object_loader load_object, kernel_runner run_kernel)
receive_and_load_object(load_object);
else if(msgtype == MSGTYPE_RUN_KERNEL)
receive_and_run_kernel(run_kernel);
else if(msgtype == MSGTYPE_UART_SETBDRATE) {
unsigned int ftw = receive_int();
else if(msgtype == MSGTYPE_SET_BAUD_RATE) {
unsigned int ftw;
ftw = ((long long)receive_int() << 32LL)/(long long)identifier_frequency_read();
send_int(0x5a5a5a5a);
uart_sync();
uart_tuning_word_write(ftw);