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rt2wb, exceptions: remove RTIOTimeout 

Assume that rt2wb transactions either collide and are then
reported (https://github.com/m-labs/artiq/issues/308) or that
they complete and the delay with which they complete does not matter.

If a transaction is ack'ed with a delay because the WB core's downstream
logic is busy, that may lead to a later collision with another WB
transaction.
This commit is contained in:
Robert Jördens 2016-03-01 14:44:07 +01:00
parent c2fe9a08ae
commit 324660ab40
6 changed files with 26 additions and 73 deletions
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5
artiq/coredevice/__init__.py
View File

@ -1,13 +1,12 @@
from artiq.coredevice import exceptions, dds, spi
from artiq.coredevice.exceptions import (RTIOUnderflow, RTIOSequenceError,
RTIOCollisionError, RTIOOverflow,
DDSBatchError, CacheError,
RTIOTimeout)
DDSBatchError, CacheError)
from artiq.coredevice.dds import (PHASE_MODE_CONTINUOUS, PHASE_MODE_ABSOLUTE,
PHASE_MODE_TRACKING)
__all__ = []
__all__ += ["RTIOUnderflow", "RTIOSequenceError", "RTIOCollisionError",
"RTIOOverflow", "DDSBatchError", "CacheError", "RTIOTimeout"]
"RTIOOverflow", "DDSBatchError", "CacheError"]
__all__ += ["PHASE_MODE_CONTINUOUS", "PHASE_MODE_ABSOLUTE",
"PHASE_MODE_TRACKING"]

11
artiq/coredevice/exceptions.py
View File

@ -108,17 +108,6 @@ class RTIOOverflow(Exception):
"""
artiq_builtin = True
class RTIOTimeout(Exception):
"""Raised when an RTIO input operation does not complete within the expected
time. This is only raised by channels where a response is guaranteed, such
as RT2WB (DDS and SPI).
This does not interrupt operations further than cancelling the current read
attempt. Reading can be reattempted after the exception is caught, and
events that have arrived in the meantime will be retrieved.
"""
artiq_builtin = True
class DDSBatchError(Exception):
"""Raised when attempting to start a DDS batch while already in a batch,
or when too many commands are batched.

5
artiq/coredevice/rt2wb.py
View File

@ -11,8 +11,3 @@ def rt2wb_output(time_mu: TInt64, channel: TInt32, addr: TInt32, data: TInt32
@syscall
def rt2wb_input(channel: TInt32) -> TInt32:
raise NotImplementedError("syscall not simulated")
@syscall
def rt2wb_input_sync(timeout_mu: TInt64, channel: TInt32) -> TInt32:
raise NotImplementedError("syscall not simulated")

39
artiq/coredevice/spi.py
View File

@ -1,7 +1,7 @@
from artiq.language.core import (kernel, portable, seconds_to_mu, now_mu,
delay_mu, int)
from artiq.language.units import MHz
from artiq.coredevice.rt2wb import rt2wb_output, rt2wb_input, rt2wb_input_sync
from artiq.coredevice.rt2wb import rt2wb_output, rt2wb_input
SPI_DATA_ADDR, SPI_XFER_ADDR, SPI_CONFIG_ADDR = range(3)
@ -55,17 +55,12 @@ class SPIMaster:
self.read_period_mu = int(read_div*self.ref_period_mu)
delay_mu(3*self.ref_period_mu)
@portable
def get_xfer_period_mu(self, write_length, read_length):
return int(write_length*self.write_period_mu +
read_length*self.read_period_mu)
@kernel
def set_xfer(self, chip_select=0, write_length=0, read_length=0):
rt2wb_output(now_mu(), self.channel, SPI_XFER_ADDR,
chip_select | (write_length << 16) | (read_length << 24))
self.xfer_period_mu = self.get_xfer_period_mu(write_length,
read_length)
self.xfer_period_mu = int(write_length*self.write_period_mu +
read_length*self.read_period_mu)
delay_mu(3*self.ref_period_mu)
@kernel
@ -74,28 +69,28 @@ class SPIMaster:
delay_mu(3*self.ref_period_mu)
@kernel
def read(self):
def read_async(self):
# every read_async() must be matched by an input_async()
rt2wb_output(now_mu(), self.channel, SPI_DATA_ADDR | SPI_RT2WB_READ, 0)
delay_mu(3*self.ref_period_mu)
@kernel
def input(self):
def input_async(self):
# matches the preeeding read_async()
return rt2wb_input(self.channel)
@kernel
def _rt2wb_read_sync(self, addr=0):
t = now_mu()
rt2wb_output(t, self.channel, addr | SPI_RT2WB_READ, 0)
return rt2wb_input_sync(t + 3*self.ref_period_mu, self.channel)
@kernel
def read_sync(self):
return self._rt2wb_read_sync(SPI_DATA_ADDR)
@kernel
def _get_config_sync(self):
return self._rt2wb_read_sync(SPI_CONFIG_ADDR)
rt2wb_output(now_mu(), self.channel, SPI_DATA_ADDR | SPI_RT2WB_READ, 0)
return rt2wb_input(self.channel)
@kernel
def _get_xfer_sync(self):
return self._rt2wb_read_sync(SPI_XFER_ADDR)
rt2wb_output(now_mu(), self.channel, SPI_XFER_ADDR | SPI_RT2WB_READ, 0)
return rt2wb_input(self.channel)
@kernel
def _get_config_sync(self):
rt2wb_output(now_mu(), self.channel, SPI_CONFIG_ADDR | SPI_RT2WB_READ,
0)
return rt2wb_input(self.channel)

1
artiq/runtime/ksupport.c
View File

@ -124,7 +124,6 @@ static const struct symbol runtime_exports[] = {
{"rt2wb_output", &rt2wb_output},
{"rt2wb_input", &rt2wb_input},
{"rt2wb_input_sync", &rt2wb_input_sync},
{"cache_get", &cache_get},
{"cache_put", &cache_put},

38
artiq/runtime/rt2wb.c
View File

@ -18,38 +18,14 @@ unsigned int rt2wb_input(int channel)
int status;
rtio_chan_sel_write(channel);
status = rtio_i_status_read();
if (status & RTIO_I_STATUS_OVERFLOW) {
rtio_i_overflow_reset_write(1);
artiq_raise_from_c("RTIOOverflow",
"RT2WB input overflow on channel {0}",
channel, 0, 0);
while((status = rtio_i_status_read())) {
if(status & RTIO_I_STATUS_OVERFLOW) {
rtio_i_overflow_reset_write(1);
artiq_raise_from_c("RTIOOverflow",
"RT2WB input overflow on channel {0}",
channel, 0, 0);
}
}
if (status & RTIO_I_STATUS_EMPTY)
artiq_raise_from_c("RTIOTimeout",
"RT2WB input timeout on channel {0}",
channel, 0, 0);
data = rtio_i_data_read();
rtio_i_re_write(1);
return data;
}
unsigned int rt2wb_input_sync(long long int timeout, int channel)
{
unsigned int data;
int status;
status = rtio_input_wait(timeout, channel);
if (status & RTIO_I_STATUS_OVERFLOW)
artiq_raise_from_c("RTIOOverflow",
"RT2WB input overflow on channel {0}",
channel, 0, 0);
if (status & RTIO_I_STATUS_EMPTY)
artiq_raise_from_c("RTIOTimeout",
"RT2WB input timeout on channel {0}",
channel, 0, 0);
data = rtio_i_data_read();
rtio_i_re_write(1);