[wip] Raw I/O support with libsimpleio

3rdparty/3rdparty.cmake

@@ -23,5 +23,6 @@ include(3rdparty/gamma.cmake)
 include(3rdparty/r8brain.cmake)
 include(3rdparty/mimalloc.cmake)
 include(3rdparty/snappy.cmake)
+include(3rdparty/libsimpleio.cmake)
 include(3rdparty/shmdata.cmake)
 include(3rdparty/sndfile.cmake)

3rdparty/libsimpleio.cmake

@@ -0,0 +1,41 @@
+if(UNIX AND NOT APPLE AND NOT EMSCRIPTEN)
+add_library(simpleio STATIC
+  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/cplusplus.h"
+  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/errmsg.c"
+  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/errmsg.inc"
+  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libadc.c"
+  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libadc.h"
+  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libdac.c"
+  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libdac.h"
+#  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libevent.c"
+#  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libevent.h"
+  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libgpio.c"
+  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libgpio.h"
+  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libhidraw.c"
+  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libhidraw.h"
+#  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libi2c.c"
+#  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libi2c.h"
+#  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libipv4.c"
+#  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libipv4.h"
+  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/liblinux.c"
+  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/liblinux.h"
+#  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/liblinx.c"
+#  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/liblinx.h"
+  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libpwm.c"
+  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libpwm.h"
+#  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libserial.c"
+#  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libserial.h"
+#  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libspi.c"
+#  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libspi.h"
+#  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libstream.c"
+#  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libstream.h"
+#  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libwatchdog.c"
+#  "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/libsimpleio/libwatchdog.h"
+  )
+
+target_include_directories(
+  simpleio
+  PUBLIC
+    "${CMAKE_CURRENT_LIST_DIR}/libsimpleio/"
+)
+endif()

3rdparty/libsimpleio/libsimpleio/cplusplus.h

@@ -0,0 +1,41 @@
+// C++ linkage goop: Define _BEGIN_STD_C and _END_STD_C, if necessary
+
+// Copyright (C)2013-2023, Philip Munts dba Munts Technologies.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef CPLUSPLUS_H
+#define CPLUSPLUS_H
+
+#if !(defined(_BEGIN_STD_C) && defined(_END_STD_C))
+#ifdef __cplusplus
+#ifdef _HAVE_STD_CXX
+#define _BEGIN_STD_C namespace std { extern "C" {
+#define _END_STD_C  } }
+#else
+#define _BEGIN_STD_C extern "C" {
+#define _END_STD_C  }
+#endif
+#else
+#define _BEGIN_STD_C
+#define _END_STD_C
+#endif
+#endif
+
+#endif

3rdparty/libsimpleio/libsimpleio/errmsg.c

@@ -0,0 +1,53 @@
+// Define macros for display error messages
+
+// Copyright (C)2016-2023, Philip Munts dba Munts Technologies.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+
+void PrintErrorMessage(const char *func, const char *file, int line, const char *msg, int err)
+{
+  char *slevel = getenv("DEBUGLEVEL");
+  if (slevel == NULL) return;
+
+  int ilevel = atoi(slevel);
+
+  switch (ilevel)
+  {
+    case 1 :
+      fprintf(stderr, "ERROR in %s(), at %s line %d: %s, %s\n", func, file, line, msg, strerror(err));
+      break;
+
+    case 2 :
+      syslog(LOG_ERR, "ERROR in %s(), at %s line %d: %s, %s\n", func, file, line, msg, strerror(err));
+      break;
+
+    case 3 :
+      fprintf(stderr, "ERROR in %s(), at %s line %d: %s, %s\n", func, file, line, msg, strerror(err));
+      syslog(LOG_ERR, "ERROR in %s(), at %s line %d: %s, %s\n", func, file, line, msg, strerror(err));
+      break;
+
+    default :
+      break;
+  }
+}

3rdparty/libsimpleio/libsimpleio/errmsg.inc

@@ -0,0 +1,27 @@
+// Define macros for display error messages
+
+// Copyright (C)2016-2023, Philip Munts dba Munts Technologies.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+
+#include <string.h>
+
+void PrintErrorMessage(const char *func, const char *file, int line, const char *msg, int err);
+
+#define ERRORMSG(msg, err, line) PrintErrorMessage(__func__, __FILE__, line, msg, err)

3rdparty/libsimpleio/libsimpleio/libadc.c

@@ -0,0 +1,193 @@
+/* Industrial I/O A/D Converter services for Linux */
+
+// Copyright (C)2017-2023, Philip Munts dba Munts Technologies.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/param.h>
+
+#include "errmsg.inc"
+#include "libadc.h"
+
+#define NAME_FILE	"/sys/bus/iio/devices/iio:device%d/name"
+#define DATA_FILE	"/sys/bus/iio/devices/iio:device%d/in_voltage%d_raw"
+
+void ADC_get_name(int32_t chip, char *name, int32_t namesize, int32_t *error)
+{
+  assert(error != NULL);
+
+  char filename[MAXPATHLEN];
+  int fd;
+  ssize_t len;
+
+  // Validate parameters
+
+  if (chip < 0)
+  {
+    *error = EINVAL;
+    ERRORMSG("chip argument is invalid", *error, __LINE__ - 3);
+    return;
+  }
+
+  if (name == NULL)
+  {
+    *error = EINVAL;
+    ERRORMSG("name argument is NULL", *error, __LINE__ - 3);
+    return;
+  }
+
+  if (namesize < 16)
+  {
+    *error = EINVAL;
+    ERRORMSG("namesize argument is too small", *error, __LINE__ - 3);
+    return;
+  }
+
+  memset(filename, 0, sizeof(filename));
+  snprintf(filename, sizeof(filename), NAME_FILE, chip);
+
+  fd = open(filename, O_RDONLY);
+  if (fd < 0)
+  {
+    *error = errno;
+    ERRORMSG("open() failed", *error, __LINE__ - 4);
+    return;
+  }
+
+  memset(name, 0, namesize);
+  len = read(fd, name, namesize - 1);
+
+  if (len >= 0)
+    *error = 0;
+  else
+  {
+    *error = errno;
+    ERRORMSG("read() failed", *error, __LINE__ - 7);
+  }
+
+  while ((len > 0) && isspace(name[len-1]))
+    name[--len] = 0;
+
+  close(fd);
+}
+
+void ADC_open(int32_t chip, int32_t channel, int32_t *fd, int32_t *error)
+{
+  assert(error != NULL);
+
+  // Validate parameters
+
+  if (fd == NULL)
+  {
+    *error = EINVAL;
+    ERRORMSG("fd argument is NULL", *error, __LINE__ - 3);
+    return;
+  }
+
+  if (chip < 0)
+  {
+    *fd = -1;
+    *error = EINVAL;
+    ERRORMSG("chip argument is invalid", *error, __LINE__ - 4);
+    return;
+  }
+
+  // Validate parameters
+
+  if (channel < 0)
+  {
+    *fd = -1;
+    *error = EINVAL;
+    ERRORMSG("channel argument is invalid", *error, __LINE__ - 4);
+    return;
+  }
+
+  char filename[MAXPATHLEN];
+  snprintf(filename, sizeof(filename), DATA_FILE, chip, channel);
+
+  *fd = open(filename, O_RDONLY);
+  if (*fd < 0)
+  {
+    *fd = -1;
+    *error = errno;
+    ERRORMSG("open() failed", *error, __LINE__ - 5);
+    return;
+  }
+
+  *error = 0;
+}
+
+void ADC_read(int32_t fd, int32_t *sample, int32_t *error)
+{
+  assert(error != NULL);
+
+  char buf[32];
+  ssize_t len;
+
+  // Validate parameters
+
+  if (fd < 0)
+  {
+    *sample = 0;
+    *error = EINVAL;
+    ERRORMSG("fd argument is invalid", *error, __LINE__ - 3);
+    return;
+  }
+
+  if (sample == NULL)
+  {
+    *error = EINVAL;
+    ERRORMSG("sample argument is NULL", *error, __LINE__ - 3);
+    return;
+  }
+
+  // Rewind the raw data file
+
+  if (lseek(fd, SEEK_SET, 0) < 0)
+  {
+    *sample = 0;
+    *error = errno;
+    ERRORMSG("lseek() failed", *error, __LINE__ - 4);
+    return;
+  }
+
+  // Read the raw data file
+
+  len = read(fd, buf, sizeof(buf) - 1);
+
+  if (len < 0)
+  {
+    *sample = 0;
+    *error = errno;
+    ERRORMSG("read() failed", *error, __LINE__ - 4);
+    return;
+  }
+
+  buf[len] = 0;
+  *sample = atoi(buf);
+  *error = 0;
+}