diff options
Diffstat (limited to '_receiver/shmemIface.py')
| -rwxr-xr-x | _receiver/shmemIface.py | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/_receiver/shmemIface.py b/_receiver/shmemIface.py new file mode 100755 index 0000000..fd301b1 --- /dev/null +++ b/_receiver/shmemIface.py @@ -0,0 +1,195 @@ +""" + HeIMDALL DAQ Firmware + Python based shared memory interface implementations + + Author: Tamás Pető + License: GNU GPL V3 + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <https://www.gnu.org/licenses/>. +""" +import logging +from struct import pack, unpack +from multiprocessing import shared_memory +import numpy as np +import os + +A_BUFF_READY = 1 +B_BUFF_READY = 2 +INIT_READY = 10 +TERMINATE = 255 +class outShmemIface(): + + + def __init__(self, shmem_name, shmem_size, drop_mode = False): + + self.init_ok = True + logging.basicConfig(level=logging.INFO) + self.logger = logging.getLogger(__name__) + self.drop_mode = drop_mode + self.dropped_frame_cntr = 0 + + self.shmem_name = shmem_name + self.buffer_free = [True, True] + + self.memories = [] + self.buffers = [] + + # Try to remove shared memories if already exist + try: + shmem_A = shared_memory.SharedMemory(name=shmem_name+'_A',create=False, size=shmem_size) + shmem_A.close() + #shmem_A.unkink() + except FileNotFoundError as err: + self.logger.warning("Shared memory not exist") + try: + shmem_B = shared_memory.SharedMemory(name=shmem_name+'_B',create=False, size=shmem_size) + shmem_B.close() + #shmem_B.unkink() + except FileNotFoundError as err: + self.logger.warning("Shared memory not exist") + + # Create the shared memories + self.memories.append(shared_memory.SharedMemory(name=shmem_name+'_A',create=True, size=shmem_size)) + self.memories.append(shared_memory.SharedMemory(name=shmem_name+'_B',create=True, size=shmem_size)) + self.buffers.append(np.ndarray((shmem_size,), dtype=np.uint8, buffer=self.memories[0].buf)) + self.buffers.append(np.ndarray((shmem_size,), dtype=np.uint8, buffer=self.memories[1].buf)) + + # Opening control FIFOs + if self.drop_mode: + bw_fifo_flags = os.O_RDONLY | os.O_NONBLOCK + else: + bw_fifo_flags = os.O_RDONLY + try: + self.fw_ctr_fifo = os.open('_data_control/'+'fw_'+shmem_name, os.O_WRONLY) + self.bw_ctr_fifo = os.open('_data_control/'+'bw_'+shmem_name, bw_fifo_flags) + except OSError as err: + self.logger.critical("OS error: {0}".format(err)) + self.logger.critical("Failed to open control fifos") + self.bw_ctr_fifo = None + self.fw_ctr_fifo = None + self.init_ok = False + + # Send init ready signal + if self.init_ok: + os.write(self.fw_ctr_fifo, pack('B',INIT_READY)) + + def send_ctr_buff_ready(self, active_buffer_index): + # Send buffer ready signal on the forward FIFO + if active_buffer_index == 0: + os.write(self.fw_ctr_fifo, pack('B',A_BUFF_READY)) + elif active_buffer_index == 1: + os.write(self.fw_ctr_fifo, pack('B',B_BUFF_READY)) + + # Deassert buffer free flag + self.buffer_free[active_buffer_index] = False + + def send_ctr_terminate(self): + os.write(self.fw_ctr_fifo, pack('B',TERMINATE)) + self.logger.info("Terminate signal sent") + + def destory_sm_buffer(self): + for memory in self.memories: + memory.close() + memory.unlink() + + if self.fw_ctr_fifo is not None: + os.close(self.fw_ctr_fifo) + + if self.bw_ctr_fifo is not None: + os.close(self.bw_ctr_fifo) + + def wait_buff_free(self): + if self.buffer_free[0]: + return 0 + elif self.buffer_free[1]: + return 1 + else: + try: + buffer = os.read(self.bw_ctr_fifo, 1) + signal = unpack('B', buffer )[0] + + if signal == A_BUFF_READY: + self.buffer_free[0] = True + return 0 + if signal == B_BUFF_READY: + self.buffer_free[1] = True + return 1 + except BlockingIOError as err: + self.dropped_frame_cntr +=1 + self.logger.warning("Dropping frame.. Total: [{:d}] ".format(self.dropped_frame_cntr)) + return 3 + return -1 + + +class inShmemIface(): + + def __init__(self, shmem_name, ctr_fifo_path="_data_control/"): + + self.init_ok = True + logging.basicConfig(level=logging.INFO) + self.logger = logging.getLogger(__name__) + self.drop_mode = False + + self.shmem_name = shmem_name + + self.memories = [] + self.buffers = [] + try: + self.fw_ctr_fifo = os.open(ctr_fifo_path+'fw_'+shmem_name, os.O_RDONLY) + self.bw_ctr_fifo = os.open(ctr_fifo_path+'bw_'+shmem_name, os.O_WRONLY) + except OSError as err: + self.logger.critical("OS error: {0}".format(err)) + self.logger.critical("Failed to open control fifos") + self.bw_ctr_fifo = None + self.fw_ctr_fifo = None + self.init_ok = False + + if self.fw_ctr_fifo is not None: + if unpack('B', os.read(self.fw_ctr_fifo, 1))[0] == INIT_READY: + self.memories.append(shared_memory.SharedMemory(name=shmem_name+'_A')) + self.memories.append(shared_memory.SharedMemory(name=shmem_name+'_B')) + self.buffers.append(np.ndarray((self.memories[0].size,), + dtype=np.uint8, + buffer=self.memories[0].buf)) + self.buffers.append(np.ndarray((self.memories[1].size,), + dtype=np.uint8, + buffer=self.memories[1].buf)) + else: + self.init_ok = False + + def send_ctr_buff_ready(self, active_buffer_index): + if active_buffer_index == 0: + os.write(self.bw_ctr_fifo, pack('B',A_BUFF_READY)) + elif active_buffer_index == 1: + os.write(self.bw_ctr_fifo, pack('B',B_BUFF_READY)) + + def destory_sm_buffer(self): + for memory in self.memories: + memory.close() + + if self.fw_ctr_fifo is not None: + os.close(self.fw_ctr_fifo) + + if self.bw_ctr_fifo is not None: + os.close(self.bw_ctr_fifo) + + def wait_buff_free(self): + signal = unpack('B', os.read(self.fw_ctr_fifo, 1))[0] + if signal == A_BUFF_READY: + return 0 + elif signal == B_BUFF_READY: + return 1 + elif signal == TERMINATE: + return TERMINATE + return -1 |