Add C++ Peripheral class

CMakeLists.txt

@@ -33,22 +33,25 @@ set(AVCLAN_TARGET avr-attiny3216 CACHE STRING "Hardware target (port) to build")
 add_library(avclan STATIC
     src/avclan/avclan_frame.c
     src/avclan/avclan_protocol.c
-    src/avclan/cdchanger.c)
+    src/avclan/cdchanger.c
+    src/avclan/peripheral.cc
+)
 
-add_executable(mockingboard
-    src/sniffer.cc
-    src/com232.c)
-    
 # avclan exports its public generic headers (src/avclan) to consumers and
 # reaches into src/ for sibling headers (com232.h, board.h) during its own
 # build. The selected target adds its own per-target include path.
-target_include_directories(avclan
-    PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/src/avclan
-    PRIVATE ${CMAKE_CURRENT_SOURCE_DIR}/src)
-
-target_link_libraries(mockingboard avclan)
+target_include_directories(avclan PUBLIC
+    ${CMAKE_CURRENT_SOURCE_DIR}/src/avclan
+    ${CMAKE_CURRENT_SOURCE_DIR}/src)
 
 # Pull in the selected hardware target: its port sources, per-target headers,
 # hardware-specific compile options/definitions, device-pack handling, and the
 # flashing target. Added after the targets above so it can extend them.
 add_subdirectory(src/avclan/target/${AVCLAN_TARGET})
+
+add_executable(mockingboard
+    src/sniffer.cc
+    src/com232.c
+)
+
+target_link_libraries(mockingboard avclan)

src/avclan/avclan_defs.h

@@ -137,7 +137,7 @@ typedef enum avclan_bit : uint8_t {
 // progress/success before an error occured, with 0 being no errors
 typedef enum : uint8_t {
   rNO_ERROR = 0x00,
-  rBAD_DATA_PARITY,
+  rBAD_DATA_PARITY = 0x01,
   rBAD_LENGTH_RANGE,
   rBAD_LENGTH_PARITY,
   rBAD_PERIPHERAL_PARITY,
@@ -150,7 +150,7 @@ typedef enum : uint8_t {
 
 typedef enum : uint8_t {
   sNO_ERROR = 0x00,
-  sNAK_DATA,
+  sNAK_DATA = 0x01,
   sNAK_MESSAGE_LENGTH,
   sNAK_CONTROL,
   sNAK_ADDRESS,

src/avclan/avclan_frame.c

@@ -10,262 +10,6 @@
 #include "avclan_phy.h" // bus symbol I/O + transaction guard (target-provided)
 #include "com232.h"     // error logging
 
-avclan_readerr_t AVCLAN_readframe(AVCLAN_frame_t *frame, log_t print) {
-  struct errtype {
-    avclan_readerr_t errno;
-    union {
-      uint8_t val; // BAD_LENGTH_RANGE: the out-of-range length value
-      struct {
-        uint16_t read_val;
-        uint8_t parity; // received (bad) parity bit
-      };
-    };
-  } err = {0};
-
-  AVCLAN_stopEvent(); // quiesce contending sources during the read
-
-  uint8_t tmp = 0;
-
-  err.errno = AVCLAN_readstartbit();
-  if (err.errno)
-    goto handle_err;
-
-  AVCLAN_readbits(&tmp, 1);
-  frame->is_unicast = tmp;
-
-  uint8_t parity = AVCLAN_readbits(&frame->controller_addr, 12);
-  AVCLAN_readbits(&tmp, 1);
-  if (parity != (tmp &= 1)) {
-    err.errno = rBAD_CONTROLLER_PARITY;
-    if (print.verbose) {
-      err.read_val = frame->controller_addr;
-      err.parity = tmp;
-    }
-    goto handle_err;
-  }
-
-  parity = AVCLAN_readbits(&frame->peripheral_addr, 12);
-  AVCLAN_readbits(&tmp, 1);
-  if (parity != (tmp &= 1)) {
-    err.errno = rBAD_PERIPHERAL_PARITY;
-    if (print.verbose) {
-      err.read_val = frame->peripheral_addr;
-      err.parity = tmp;
-    }
-    goto handle_err;
-  }
-
-  bool shouldACK = !AVCLAN_ismuted() && (frame->peripheral_addr == DEVICE_ADDR);
-
-  if (shouldACK)
-    AVCLAN_sendbit_ACK();
-  else
-    AVCLAN_readbits(&tmp, 1);
-
-  parity = AVCLAN_readbits(&frame->control, 4);
-  AVCLAN_readbits(&tmp, 1);
-  if (parity != (tmp &= 1)) {
-    err.errno = rBAD_CONTROL_PARITY;
-    if (print.verbose) {
-      err.read_val = frame->control;
-      err.parity = tmp;
-    }
-    goto handle_err;
-  } else if (shouldACK) {
-    AVCLAN_sendbit_ACK();
-  } else {
-    AVCLAN_readbits(&tmp, 1);
-  }
-
-  parity = AVCLAN_readbyte(&frame->length);
-  AVCLAN_readbits(&tmp, 1);
-  if (parity != (tmp &= 1)) {
-    err.errno = rBAD_LENGTH_PARITY;
-    if (print.verbose) {
-      err.read_val = frame->length;
-      err.parity = tmp;
-    }
-    goto handle_err;
-  } else if (shouldACK) {
-    AVCLAN_sendbit_ACK();
-  } else {
-    AVCLAN_readbits(&tmp, 1);
-  }
-
-  if (frame->length == 0 || frame->length > MAXMSGLEN) {
-    err.errno = rBAD_LENGTH_RANGE;
-    err.val = frame->length;
-    goto handle_err;
-  }
-
-  for (uint8_t i = 0; i < frame->length; i++) {
-    parity = AVCLAN_readbyte(&frame->data[i]);
-    AVCLAN_readbits(&tmp, 1);
-    if (parity != (tmp &= 1)) {
-      err.errno = rBAD_DATA_PARITY;
-      if (print.verbose) {
-        err.read_val = frame->data[i];
-        err.parity = tmp;
-      }
-      goto handle_err;
-    } else if (shouldACK) {
-      AVCLAN_sendbit_ACK();
-    } else {
-      AVCLAN_readbits(&tmp, 1);
-    }
-  }
-
-  if (false) {
-  handle_err:;
-    AVCLAN_startEvent();
-    RS232_Print("ERR(read): ");
-    switch (err.errno) {
-      case rLATCHED_COMPARATOR: RS232_Print("latched comparator"); break;
-      case rSTARTBIT_TOO_SHORT: RS232_Print("start bit too short"); break;
-      case rSTARTBIT_TOO_LONG: RS232_Print("start bit too long"); break;
-      case rBAD_CONTROLLER_PARITY:
-        RS232_Print("reading controller addr.");
-        goto VERBOSE;
-      case rBAD_PERIPHERAL_PARITY:
-        RS232_Print("reading peripheral addr.");
-        goto VERBOSE;
-      case rBAD_CONTROL_PARITY: RS232_Print("reading control"); goto VERBOSE;
-      case rBAD_LENGTH_PARITY: RS232_Print("reading length"); goto VERBOSE;
-      case rBAD_LENGTH_RANGE:
-        RS232_Print("bad length 0x");
-        RS232_PrintHex4(err.val);
-        break;
-      case rBAD_DATA_PARITY: RS232_Print("reading data"); goto VERBOSE;
-      case rNO_ERROR:
-        __builtin_unreachable();
-      VERBOSE:
-        if (print.verbose) {
-          RS232_Print("; read 0x");
-          RS232_PrintHex(err.read_val);
-          RS232_Print(" and got bad parity ");
-          RS232_PrintHex4(err.parity);
-        }
-    }
-    RS232_Print("\n");
-  } else {
-    AVCLAN_startEvent();
-  }
-
-  // Only print if some data has been correctly received
-  if (print.print && (err.errno < rSTARTBIT_TOO_SHORT)) {
-    if (err.errno > rBAD_DATA_PARITY)
-      frame->length = 0;
-    AVCLAN_printframe(frame, print.binary);
-  }
-
-  return err.errno;
-}
-
-avclan_senderr_t AVCLAN_sendframe(const AVCLAN_frame_t *frame, log_t print) {
-  struct errtype {
-    // Error enum is ordered such that a lower numeric value corresponds to more
-    // success
-    avclan_senderr_t errno;
-    uint8_t val;
-  } err = {0};
-
-  if (AVCLAN_ismuted()) {
-    err.errno = sMUTED;
-    goto handle_err;
-  }
-
-  AVCLAN_stopEvent();
-
-  if (!AVCLAN_sendstartbit()) {
-    // Some other device is already driving the bus
-    err.errno = sBUSY;
-    goto handle_err;
-  }
-
-  AVCLAN_sendbits(&(uint8_t){frame->is_unicast}, 1);
-
-  avclan_bit_t parity = AVCLAN_sendbits(&frame->controller_addr, 12);
-  AVCLAN_sendbit(parity);
-
-  parity = AVCLAN_sendbits(&frame->peripheral_addr, 12);
-  AVCLAN_sendbit(parity);
-
-  if (frame->is_unicast && !AVCLAN_readbit_ACK()) {
-    err.errno = sNAK_ADDRESS;
-    goto handle_err;
-  }
-
-  parity = AVCLAN_sendbits(&frame->control, 4);
-  AVCLAN_sendbit(parity);
-
-  if (frame->is_unicast && !AVCLAN_readbit_ACK()) {
-    err.errno = sNAK_CONTROL;
-    goto handle_err;
-  }
-
-  parity = AVCLAN_sendbyte(&frame->length); // data length
-  AVCLAN_sendbit(parity);
-
-  if (frame->is_unicast && !AVCLAN_readbit_ACK()) {
-    err.errno = sNAK_MESSAGE_LENGTH;
-    goto handle_err;
-  }
-
-  for (uint8_t i = 0; i < frame->length; i++) {
-    parity = AVCLAN_sendbyte(&frame->data[i]);
-    AVCLAN_sendbit(parity);
-    // Based on the µPD6708 datasheet, ACK bit for broadcast doesn't seem
-    // necessary (i.e. This deviates from the previous broadcast specific
-    // function that sent an extra `1` bit after each byte/parity)
-    if (frame->is_unicast && !AVCLAN_readbit_ACK()) {
-      err.errno = sNAK_DATA;
-      err.val = i;
-      goto handle_err;
-    }
-    // else
-    //   AVCLAN_sendbit_1();
-  }
-
-  // back to read mode
-  if (false) {
-  handle_err:;
-    AVCLAN_startEvent();
-    RS232_Print("Error");
-    switch (err.errno) {
-      case sMUTED: RS232_Print(": Device muted"); break;
-      case sBUSY: RS232_Print(": Busy bus"); break;
-      case sNAK_ADDRESS:
-      case sNAK_CONTROL:
-      case sNAK_MESSAGE_LENGTH:
-      case sNAK_DATA:
-        RS232_Print(" NAK: ");
-        switch (err.errno) {
-          case sNAK_ADDRESS: RS232_Print("address"); break;
-          case sNAK_CONTROL: RS232_Print("Control"); break;
-          case sNAK_MESSAGE_LENGTH: RS232_Print("Message length"); break;
-          case sNAK_DATA:
-            RS232_Print(" data[");
-            RS232_PrintDec(err.val);
-            RS232_Print("]");
-            break;
-          case sNO_ERROR:
-          case sMUTED:
-          case sBUSY: __builtin_unreachable();
-        }
-        break;
-      case sNO_ERROR: __builtin_unreachable();
-    }
-    RS232_Print("\n");
-  } else {
-    AVCLAN_startEvent();
-  }
-
-  if (print.print)
-    AVCLAN_printframe(frame, print.binary);
-
-  return err.errno;
-}
-
 void AVCLAN_printframe(const AVCLAN_frame_t *frame, bool binary) {
   if (binary) {
     uint8_t buffer[8];

src/avclan/avclan_frame.h

@@ -39,8 +39,6 @@
 extern "C" {
 #endif
 
-avclan_readerr_t AVCLAN_readframe(AVCLAN_frame_t *frame, log_t print);
-avclan_senderr_t AVCLAN_sendframe(const AVCLAN_frame_t *frame, log_t print);
 void AVCLAN_printframe(const AVCLAN_frame_t *frame, bool binary);
 uint8_t AVCLAN_parseframe(const uint8_t *bytes, uint8_t len,
                           AVCLAN_frame_t *frame);

src/avclan/avclan_phy.h

@@ -53,20 +53,6 @@ uint8_t AVCLAN_readbitsi(uint8_t *bits, uint8_t len);
 uint8_t AVCLAN_readbitsl(uint16_t *bits, int8_t len);
 uint8_t AVCLAN_readbyte(uint8_t *byte);
 
-#define AVCLAN_sendbits(bits, len)                                             \
-  _Generic((bits),                                                             \
-      const uint16_t *: AVCLAN_sendbitsl,                                      \
-      uint16_t *: AVCLAN_sendbitsl,                                            \
-      const uint8_t *: AVCLAN_sendbitsi,                                       \
-      uint8_t *: AVCLAN_sendbitsi)(bits, len)
-
-#define AVCLAN_readbits(bits, len)                                             \
-  _Generic((bits),                                                             \
-      const uint16_t *: AVCLAN_readbitsl,                                      \
-      uint16_t *: AVCLAN_readbitsl,                                            \
-      const uint8_t *: AVCLAN_readbitsi,                                       \
-      uint8_t *: AVCLAN_readbitsi)(bits, len)
-
 #ifndef NDEBUG
 // Sample and dump bus bit timing over the serial link (REPL `M`).
 void AVCLan_Measure(void);
@@ -75,3 +61,38 @@ void AVCLan_Measure(void);
 #ifdef __cplusplus
 }
 #endif
+
+#ifdef __cplusplus
+template <class T, auto N> avclan_bit_t AVCLAN_sendbits(T bits);
+template <class T, auto N> avclan_bit_t AVCLAN_readbits(T *bits);
+
+// Temporary specializations bridging to legacy C API
+// Replace with proper (single?) template when phy has been ported
+template <auto N>
+  requires(N <= 8)
+avclan_bit_t AVCLAN_sendbits(uint8_t bits) {
+  return AVCLAN_sendbitsi(&bits, N);
+}
+template <auto N>
+  requires(N <= 16)
+avclan_bit_t AVCLAN_sendbits(uint16_t bits) {
+  return AVCLAN_sendbitsl(&bits, N);
+}
+template <> inline avclan_bit_t AVCLAN_sendbits<8>(uint8_t byte) {
+  return AVCLAN_sendbyte(&byte);
+}
+
+template <auto N>
+  requires(N <= 8)
+avclan_bit_t AVCLAN_readbits(uint8_t *bits) {
+  return static_cast<avclan_bit_t>(AVCLAN_readbitsi(bits, N));
+}
+template <auto N>
+  requires(N <= 16)
+avclan_bit_t AVCLAN_readbits(uint16_t *bits) {
+  return static_cast<avclan_bit_t>(AVCLAN_readbitsl(bits, N));
+}
+template <> inline avclan_bit_t AVCLAN_readbits<8>(uint8_t *byte) {
+  return static_cast<avclan_bit_t>(AVCLAN_readbyte(byte));
+}
+#endif

src/avclan/peripheral.cc

@@ -0,0 +1,278 @@
+// copyright (C) 2006 Marcin Slonicki <marcin@softservice.com.pl>
+// copyright (C) 2007 Louis Frigon
+// Copyright (C) 2015 Allen Hill <allenofthehills@gmail.com>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "peripheral.hpp"
+#include "avclan_defs.h"
+#include "avclan_frame.h"
+#include "avclan_phy.h" // bus symbol I/O + transaction guard (target-provided)
+#include "com232.h"     // error logging
+
+#include <cstdint>
+
+namespace avclan {
+
+Peripheral::Error::Read Peripheral::read(AVCLAN_frame_t *in, log_t print) {
+  struct errtype {
+    Error::Read errno;
+    union {
+      uint8_t val; // BAD_LENGTH_RANGE: the out-of-range length value
+      struct {
+        uint8_t parity; // received (bad) parity bit
+        uint16_t read_val;
+      };
+    };
+  } err = {};
+
+  using enum Error::Read;
+
+  AVCLAN_stopEvent(); // quiesce contending sources during the read
+
+  bool shouldACK = false;
+  uint8_t tmp = 0, parity = 0;
+
+  err.errno = Error::Read{AVCLAN_readstartbit()};
+  if (static_cast<uint8_t>(err.errno))
+    goto handle_err;
+
+  AVCLAN_readbits<1>(&tmp);
+  in->is_unicast = tmp;
+
+  parity = AVCLAN_readbits<12>(&in->controller_addr);
+  AVCLAN_readbits<1>(&tmp);
+  if (parity != (tmp &= 1)) {
+    err.errno = BAD_CONTROLLER_PARITY;
+    if (print.verbose) {
+      err.read_val = in->controller_addr;
+      err.parity = tmp;
+    }
+    goto handle_err;
+  }
+
+  parity = AVCLAN_readbits<12>(&in->peripheral_addr);
+  AVCLAN_readbits<1>(&tmp);
+  if (parity != (tmp &= 1)) {
+    err.errno = BAD_PERIPHERAL_PARITY;
+    if (print.verbose) {
+      err.read_val = in->peripheral_addr;
+      err.parity = tmp;
+    }
+    goto handle_err;
+  }
+
+  shouldACK = !AVCLAN_ismuted() && (in->peripheral_addr == address);
+
+  if (shouldACK)
+    AVCLAN_sendbit_ACK();
+  else
+    AVCLAN_readbits<1>(&tmp);
+
+  parity = AVCLAN_readbits<4>(&in->control);
+  AVCLAN_readbits<1>(&tmp);
+  if (parity != (tmp &= 1)) {
+    err.errno = BAD_CONTROL_PARITY;
+    if (print.verbose) {
+      err.read_val = in->control;
+      err.parity = tmp;
+    }
+    goto handle_err;
+  } else if (shouldACK) {
+    AVCLAN_sendbit_ACK();
+  } else {
+    AVCLAN_readbits<1>(&tmp);
+  }
+
+  parity = AVCLAN_readbyte(&in->length);
+  AVCLAN_readbits<1>(&tmp);
+  if (parity != (tmp &= 1)) {
+    err.errno = BAD_LENGTH_PARITY;
+    if (print.verbose) {
+      err.read_val = in->length;
+      err.parity = tmp;
+    }
+    goto handle_err;
+  } else if (shouldACK) {
+    AVCLAN_sendbit_ACK();
+  } else {
+    AVCLAN_readbits<1>(&tmp);
+  }
+
+  if (in->length == 0 || in->length > MAXMSGLEN) {
+    err.errno = BAD_LENGTH_RANGE;
+    err.val = in->length;
+    goto handle_err;
+  }
+
+  for (uint8_t i = 0; i < in->length; i++) {
+    parity = AVCLAN_readbits<8>(&in->data[i]);
+    AVCLAN_readbits<1>(&tmp);
+    if (parity != (tmp &= 1)) {
+      err.errno = BAD_DATA_PARITY;
+      if (print.verbose) {
+        err.read_val = in->data[i];
+        err.parity = tmp;
+      }
+      goto handle_err;
+    } else if (shouldACK) {
+      AVCLAN_sendbit_ACK();
+    } else {
+      AVCLAN_readbits<1>(&tmp);
+    }
+  }
+
+  if (false) {
+  handle_err:;
+    AVCLAN_startEvent();
+    RS232_Print("ERR(read): ");
+    switch (err.errno) {
+      case BAD_STARTBIT: RS232_Print("bad start bit (other)"); break;
+      case STARTBIT_TOO_SHORT: RS232_Print("bad start bit (short)"); break;
+      case STARTBIT_TOO_LONG: RS232_Print("bad start bit (long)"); break;
+      case BAD_CONTROLLER_PARITY:
+        RS232_Print("reading controller addr.");
+        goto VERBOSE;
+      case BAD_PERIPHERAL_PARITY:
+        RS232_Print("reading peripheral addr.");
+        goto VERBOSE;
+      case BAD_CONTROL_PARITY: RS232_Print("reading control"); goto VERBOSE;
+      case BAD_LENGTH_PARITY: RS232_Print("reading length"); goto VERBOSE;
+      case BAD_LENGTH_RANGE:
+        RS232_Print("bad length 0x");
+        RS232_PrintHex4(err.val);
+        break;
+      case BAD_DATA_PARITY:
+        RS232_Print("reading data");
+        goto VERBOSE;
+      VERBOSE:
+        if (print.verbose) {
+          RS232_Print("; read 0x");
+          RS232_PrintHex(err.read_val);
+          RS232_Print(" and got bad parity ");
+          RS232_PrintHex4(err.parity);
+        }
+    }
+    RS232_Print("\n");
+  } else {
+    AVCLAN_startEvent();
+  }
+
+  // Only print if some data has been correctly received
+  if (print.print && (err.errno < STARTBIT_TOO_SHORT)) {
+    if (err.errno > BAD_DATA_PARITY)
+      in->length = 0;
+    AVCLAN_printframe(in, print.binary);
+  }
+
+  return err.errno;
+}
+
+Peripheral::Error::Send Peripheral::send(const AVCLAN_frame_t *out,
+                                         log_t print) {
+  struct errtype {
+    // Error enum is ordered such that a lower numeric value corresponds to
+    // more success
+    Error::Send errno;
+    uint8_t val;
+  } err = {};
+
+  using enum Error::Send;
+
+  avclan_bit_t parity;
+
+  if (AVCLAN_ismuted()) {
+    err.errno = MUTED;
+    goto handle_err;
+  }
+
+  AVCLAN_stopEvent();
+
+  if (!AVCLAN_sendstartbit()) {
+    // Some other device is already driving the bus
+    err.errno = BUSY;
+    goto handle_err;
+  }
+
+  AVCLAN_sendbits<1>(static_cast<uint8_t>(out->is_unicast));
+
+  parity = AVCLAN_sendbits<12>(out->controller_addr);
+  AVCLAN_sendbit(parity);
+
+  parity = AVCLAN_sendbits<12>(address);
+  AVCLAN_sendbit(parity);
+
+  if (out->is_unicast && !AVCLAN_readbit_ACK()) {
+    err.errno = NAK_ADDRESS;
+    goto handle_err;
+  }
+
+  parity = AVCLAN_sendbits<4>(out->control);
+  AVCLAN_sendbit(parity);
+
+  if (out->is_unicast && !AVCLAN_readbit_ACK()) {
+    err.errno = NAK_CONTROL;
+    goto handle_err;
+  }
+
+  parity = AVCLAN_sendbits<8>(out->length); // data length
+  AVCLAN_sendbit(parity);
+
+  if (out->is_unicast && !AVCLAN_readbit_ACK()) {
+    err.errno = NAK_MESSAGE_LENGTH;
+    goto handle_err;
+  }
+
+  for (uint8_t i = 0; i < out->length; i++) {
+    parity = AVCLAN_sendbits<8>(out->data[i]);
+    AVCLAN_sendbit(parity);
+    // Based on the µPD6708 datasheet, ACK bit for broadcast doesn't seem
+    // necessary (i.e. This deviates from the previous broadcast specific
+    // function that sent an extra `1` bit after each byte/parity)
+    if (out->is_unicast && !AVCLAN_readbit_ACK()) {
+      err.errno = NAK_DATA;
+      err.val = i;
+      goto handle_err;
+    }
+    // else
+    //   AVCLAN_sendbit_1();
+  }
+
+  // back to read mode
+  if (false) {
+  handle_err:;
+    AVCLAN_startEvent();
+    RS232_Print("Error");
+    switch (err.errno) {
+      case MUTED: RS232_Print(": Device muted"); break;
+      case BUSY: RS232_Print(": Busy bus"); break;
+      case NAK_ADDRESS:
+      case NAK_CONTROL:
+      case NAK_MESSAGE_LENGTH:
+      case NAK_DATA:
+        RS232_Print(" NAK: ");
+        switch (err.errno) {
+          case NAK_ADDRESS: RS232_Print("address"); break;
+          case NAK_CONTROL: RS232_Print("Control"); break;
+          case NAK_MESSAGE_LENGTH: RS232_Print("Message length"); break;
+          case NAK_DATA:
+            RS232_Print(" data[");
+            RS232_PrintDec(err.val);
+            RS232_Print("]");
+            break;
+          case MUTED:
+          case BUSY: __builtin_unreachable();
+        }
+        break;
+    }
+    RS232_Print("\n");
+  } else {
+    AVCLAN_startEvent();
+  }
+
+  if (print.print)
+    AVCLAN_printframe(out, print.binary);
+
+  return err.errno;
+}
+
+} // namespace avclan

src/avclan/peripheral.hpp

@@ -0,0 +1,46 @@
+// copyright (C) 2006 Marcin Slonicki <marcin@softservice.com.pl>
+// copyright (C) 2007 Louis Frigon
+// Copyright (C) 2015 Allen Hill <allenofthehills@gmail.com>
+// SPDX-License-Identifier: GPL-3.0-or-later
+#pragma once
+
+#include "avclan_defs.h"
+#include <cstdint>
+
+namespace avclan {
+class Peripheral {
+public:
+  struct Error {
+    // Error enums are ordered such that a lower numeric value corresponds to
+    // more progress/success before an error occured, with 0 being no errors
+    enum class Read : uint8_t {
+      BAD_DATA_PARITY = rBAD_DATA_PARITY, // = 0x01
+      BAD_LENGTH_RANGE = rBAD_LENGTH_RANGE,
+      BAD_LENGTH_PARITY = rBAD_LENGTH_PARITY,
+      BAD_PERIPHERAL_PARITY = rBAD_PERIPHERAL_PARITY,
+      BAD_CONTROLLER_PARITY = rBAD_CONTROLLER_PARITY,
+      BAD_CONTROL_PARITY = rBAD_CONTROL_PARITY,
+      STARTBIT_TOO_SHORT = rSTARTBIT_TOO_SHORT,
+      STARTBIT_TOO_LONG = rSTARTBIT_TOO_LONG,
+      BAD_STARTBIT = rLATCHED_COMPARATOR,
+    };
+
+    enum class Send : uint8_t {
+      NAK_DATA = sNAK_DATA, // = 0x01
+      NAK_MESSAGE_LENGTH = sNAK_MESSAGE_LENGTH,
+      NAK_CONTROL = sNAK_CONTROL,
+      NAK_ADDRESS = sNAK_ADDRESS,
+      BUSY = sBUSY,
+      MUTED = sMUTED,
+    };
+  };
+
+  Peripheral(uint16_t address) : address{address} {}
+
+  Error::Read read(AVCLAN_frame_t *in, log_t print);
+  Error::Send send(const AVCLAN_frame_t *out, log_t print);
+
+private:
+  const uint16_t address;
+};
+} // namespace avclan

src/avclan/target/avr-attiny3216/CMakeLists.txt

@@ -89,7 +89,7 @@ FetchContent_MakeAvailable(avr_libstdcpp)
 add_library(libstdcpp INTERFACE)
 target_include_directories(libstdcpp SYSTEM
     INTERFACE ${avr_libstdcpp_SOURCE_DIR}/include)
-target_link_libraries(avclan INTERFACE libstdcpp)
+target_link_libraries(avclan PUBLIC libstdcpp)
 endif()
 
 

src/sniffer.cc

@@ -10,6 +10,7 @@
 #include "avclandrv.h"
 #include "board.h"
 #include "com232.h"
+#include "peripheral.hpp"
 #include "queue.hpp"
 
 const char *const offon[] = {"OFF", "ON"};
@@ -59,7 +60,6 @@ int main() {
   uint8_t data_tmp[MAXMSGLEN + sizeof(AVCLAN_frame_t)];
   uint8_t seqIdx = 0; // current index in data_tmp
 
-  uint8_t err = 0;
   uint8_t failedStatusReports = 0;
 
   // Temporary, direct access is questionable since cache has ownership
@@ -69,16 +69,19 @@ int main() {
 
   const AVCLAN_frame_t *lastStatus = nullptr;
 
+  avclan::Peripheral cd_changer(0x360);
+  using Error = avclan::Peripheral::Error;
+
   Setup();
   print_help();
 
   while (true) {
     if (AVCLAN_busActive()) {
       if (auto msg = cache.pop()) {
-        err = AVCLAN_readframe(msg.get(), (log_t){.print = printAllFrames,
-                                                  .binary = printBinary,
-                                                  .verbose = verbose});
-        if (!err)
+        auto err = cd_changer.read(msg.get(), (log_t){.print = printAllFrames,
+                                                      .binary = printBinary,
+                                                      .verbose = verbose});
+        if (err == Error::Read{0x00})
           incoming.push(std::move(msg));
       } else {
         RS232_Print("!! Dropping an incoming message; cache is empty !!\n");
@@ -108,18 +111,18 @@ int main() {
     }
 
     if (auto out = outgoing.pop()) {
-      err = AVCLAN_sendframe(
+      auto err = cd_changer.send(
           out.get(), (log_t){.print = printAllFrames, .binary = printBinary});
-      if (err || (reaction_t)out->reaction == r_SendOnly) {
-        if (err && out.get() == lastStatus && ++failedStatusReports > 1) {
-          failedStatusReports = 0;
-          AVCLAN_stopPlaying(); // Disable periodic updates if e.g. no-one's
-                                // listening (car was turned off?)
-        }
-      } else {
+      if (err == Error::Send{0x00} && (reaction_t)out->reaction > r_SendOnly) {
         AVCLAN_statemachine(out.get());
         if (out->reaction)
           outgoing.push(std::move(out));
+
+      } else if (err == Error::Send::NAK_ADDRESS && out.get() == lastStatus &&
+                 ++failedStatusReports > 1) {
+        failedStatusReports = 0;
+        AVCLAN_stopPlaying(); // Disable periodic updates if e.g. no-one's
+                              // listening (car was turned off?)
       }
     }