remove ep buffer for port with dedicated hw fifo

.clang-format

@@ -84,9 +84,9 @@ MaxEmptyLinesToKeep: 2
 NamespaceIndentation: All
 PenaltyBreakBeforeFirstCallParameter: 1000000
 PenaltyBreakOpenParenthesis: 1000000
+PPIndentWidth: 2
 QualifierAlignment: Custom
 QualifierOrder: ['static', 'const', 'volatile', 'restrict', 'type']
-ReflowComments: false
 SpaceAfterTemplateKeyword: false
 SpaceBeforeRangeBasedForLoopColon: false
 SpaceInEmptyParentheses: false

AGENTS.md

@@ -18,34 +18,39 @@ information that does not match the info here.
 
 - Install ARM GCC toolchain: `sudo apt-get update && sudo apt-get install -y gcc-arm-none-eabi`
 - Fetch core dependencies: `python3 tools/get_deps.py` -- takes <1 second. NEVER CANCEL.
-- For specific board families: `python3 tools/get_deps.py FAMILY_NAME` (e.g., rp2040, stm32f4)
+- For specific board families: `python3 tools/get_deps.py FAMILY_NAME` (e.g., rp2040, stm32f4), or
+  `python3 tools/get_deps.py -b BOARD_NAME`
 - Dependencies are cached in `lib/` and `hw/mcu/` directories
 
 ## Build Examples
 
 Choose ONE of these approaches:
 
-**Option 1: Individual Example with CMake (RECOMMENDED)**
+**Option 1: Individual Example with CMake and Ninja (RECOMMENDED)**
 
 ```bash
 cd examples/device/cdc_msc
 mkdir -p build && cd build
-cmake -DBOARD=raspberry_pi_pico -DCMAKE_BUILD_TYPE=MinSizeRel ..
-cmake --build . -j4
+cmake -DBOARD=raspberry_pi_pico -G Ninja -DCMAKE_BUILD_TYPE=MinSizeRel ..
+cmake --build .
 ```
 
 -- takes 1-2 seconds. NEVER CANCEL. Set timeout to 5+ minutes.
 
-**CMake with Ninja (Alternative)**
+**Option 2: All Examples for a Board**
+
+different folder than Option 1
 
 ```bash
-cd examples/device/cdc_msc
-mkdir build && cd build
-cmake -G Ninja -DBOARD=raspberry_pi_pico ..
-ninja
+cd examples/
+mkdir -p build && cd build
+cmake -DBOARD=raspberry_pi_pico -G Ninja -DCMAKE_BUILD_TYPE=MinSizeRel ..
+cmake --build .
 ```
 
-**Option 2: Individual Example with Make**
+-- takes 15-20 seconds, may have some objcopy failures that are non-critical. NEVER CANCEL. Set timeout to 30+ minutes.
+
+**Option 3: Individual Example with Make**
 
 ```bash
 cd examples/device/cdc_msc
@@ -54,13 +59,6 @@ make BOARD=raspberry_pi_pico all
 
 -- takes 2-3 seconds. NEVER CANCEL. Set timeout to 5+ minutes.
 
-**Option 3: All Examples for a Board**
-
-```bash
-python3 tools/build.py -b BOARD_NAME
-```
-
--- takes 15-20 seconds, may have some objcopy failures that are non-critical. NEVER CANCEL. Set timeout to 30+ minutes.
 
 ## Build Options
 
@@ -101,6 +99,17 @@ python3 tools/build.py -b BOARD_NAME
 - Run specific test: `cd test/unit-test && ceedling test:test_fifo`
 - Tests use Unity framework with CMock for mocking
 
+## Hardware-in-the-Loop (HIL) Testing
+
+- Run tests on actual hardware, one of following ways:
+    - test a specific board `python test/hil/hil_test.py -b BOARD_NAME -B examples local.json`
+    - test all boards in config `python test/hil/hil_test.py -B examples local.json`
+- In case of error, enabled verbose mode with `-v` flag for detailed logs. Also try to observe script output, and try to
+  modify hil_test.py (temporarily) to add more debug prints to pinpoint the issue.
+- Requires pre-built (all) examples for target boards (see Build Examples section 2)
+
+take 2-5 minutes. NEVER CANCEL. Set timeout to 20+ minutes.
+
 ## Documentation
 
 - Install requirements: `pip install -r docs/requirements.txt`
@@ -145,11 +154,8 @@ python3 tools/build.py -b BOARD_NAME
     - Install pre-commit: `pip install pre-commit && pre-commit install`
     - Runs all quality checks, unit tests, spell checking, and formatting
     - Takes 10-15 seconds. NEVER CANCEL. Set timeout to 15+ minutes.
-2. **Build validation**: Build at least one example that exercises your changes
-   ```bash
-   cd examples/device/cdc_msc
-   make BOARD=raspberry_pi_pico all
-   ```
+2. **Build validation**: Build at least one board with all example that exercises your changes, see Build Examples
+   section (option 2)
 3. Run unit tests relevant to touched modules; add fuzz/HIL coverage when modifying parsers or protocol state machines.
 
 ### Manual Testing Scenarios

docs/info/changelog.rst

@@ -5,7 +5,7 @@ Changelog
 0.20.0
 ======
 
-*November 19, 2024*
+*November 19, 2025*
 
 General
 -------

src/class/cdc/cdc_device.c

@@ -66,6 +66,8 @@ typedef struct {
 
 #define ITF_MEM_RESET_SIZE offsetof(cdcd_interface_t, line_coding)
 
+// Skip local EP buffer if dedicated hw FIFO is supported
+  #if CFG_TUD_EDPT_DEDICATED_HWFIFO == 0
 typedef struct {
   TUD_EPBUF_DEF(epout, CFG_TUD_CDC_EP_BUFSIZE);
   TUD_EPBUF_DEF(epin, CFG_TUD_CDC_EP_BUFSIZE);
@@ -75,6 +77,9 @@ typedef struct {
   #endif
 } cdcd_epbuf_t;
 
+CFG_TUD_MEM_SECTION static cdcd_epbuf_t _cdcd_epbuf[CFG_TUD_CDC];
+#endif
+
 //--------------------------------------------------------------------+
 // Weak stubs: invoked if no strong implementation is available
 //--------------------------------------------------------------------+
@@ -115,7 +120,6 @@ TU_ATTR_WEAK void tud_cdc_send_break_cb(uint8_t itf, uint16_t duration_ms) {
 // INTERNAL OBJECT & FUNCTION DECLARATION
 //--------------------------------------------------------------------+
 static cdcd_interface_t _cdcd_itf[CFG_TUD_CDC];
-CFG_TUD_MEM_SECTION static cdcd_epbuf_t _cdcd_epbuf[CFG_TUD_CDC];
 static tud_cdc_configure_t _cdcd_cfg = TUD_CDC_CONFIGURE_DEFAULT();
 
 TU_ATTR_ALWAYS_INLINE static inline uint8_t find_cdc_itf(uint8_t ep_addr) {
@@ -166,40 +170,22 @@ void tud_cdc_n_get_line_coding(uint8_t itf, cdc_line_coding_t *coding) {
 }
 
 #if CFG_TUD_CDC_NOTIFY
-bool tud_cdc_n_notify_uart_state (uint8_t itf, const cdc_notify_uart_state_t *state) {
+bool tud_cdc_n_notify_msg(uint8_t itf, cdc_notify_msg_t *msg) {
   TU_VERIFY(itf < CFG_TUD_CDC);
-  cdcd_interface_t *p_cdc   = &_cdcd_itf[itf];
-  cdcd_epbuf_t     *p_epbuf = &_cdcd_epbuf[itf];
+  const cdcd_interface_t *p_cdc = &_cdcd_itf[itf];
   TU_VERIFY(tud_ready() && p_cdc->ep_notify != 0);
   TU_VERIFY(usbd_edpt_claim(p_cdc->rhport, p_cdc->ep_notify));
 
-  cdc_notify_msg_t* notify_msg = &p_epbuf->epnotify;
-  notify_msg->request.bmRequestType = CDC_REQ_TYPE_NOTIF;
-  notify_msg->request.bRequest = CDC_NOTIF_SERIAL_STATE;
-  notify_msg->request.wValue = 0;
-  notify_msg->request.wIndex = p_cdc->itf_num;
-  notify_msg->request.wLength = sizeof(cdc_notify_uart_state_t);
-  notify_msg->serial_state = *state;
-
-  return usbd_edpt_xfer(p_cdc->rhport, p_cdc->ep_notify, (uint8_t *)notify_msg, 8 + sizeof(cdc_notify_uart_state_t), false);
-}
-
-bool tud_cdc_n_notify_conn_speed_change(uint8_t itf, const cdc_notify_conn_speed_change_t* conn_speed_change) {
-  TU_VERIFY(itf < CFG_TUD_CDC);
-  cdcd_interface_t *p_cdc   = &_cdcd_itf[itf];
-  cdcd_epbuf_t     *p_epbuf = &_cdcd_epbuf[itf];
-  TU_VERIFY(tud_ready() && p_cdc->ep_notify != 0);
-  TU_VERIFY(usbd_edpt_claim(p_cdc->rhport, p_cdc->ep_notify));
+    #if CFG_TUD_EDPT_DEDICATED_HWFIFO
+  cdc_notify_msg_t *msg_epbuf = msg;
+    #else
+  cdc_notify_msg_t *msg_epbuf = &_cdcd_epbuf[itf].epnotify;
+  *msg_epbuf                  = *msg;
+    #endif
 
-  cdc_notify_msg_t* notify_msg = &p_epbuf->epnotify;
-  notify_msg->request.bmRequestType = CDC_REQ_TYPE_NOTIF;
-  notify_msg->request.bRequest = CDC_NOTIF_CONNECTION_SPEED_CHANGE;
-  notify_msg->request.wValue = 0;
-  notify_msg->request.wIndex = p_cdc->itf_num;
-  notify_msg->request.wLength = sizeof(cdc_notify_conn_speed_change_t);
-  notify_msg->conn_speed_change = *conn_speed_change;
+  msg_epbuf->request.wIndex = p_cdc->itf_num;
 
-  return usbd_edpt_xfer(p_cdc->rhport, p_cdc->ep_notify, (uint8_t *)notify_msg, 8 + sizeof(cdc_notify_conn_speed_change_t), false);
+  return usbd_edpt_xfer(p_cdc->rhport, p_cdc->ep_notify, (uint8_t *)msg_epbuf, 8 + msg_epbuf->request.wLength, false);
 }
 #endif
 
@@ -268,8 +254,6 @@ void cdcd_init(void) {
   tu_memclr(_cdcd_itf, sizeof(_cdcd_itf));
   for (uint8_t i = 0; i < CFG_TUD_CDC; i++) {
     cdcd_interface_t *p_cdc   = &_cdcd_itf[i];
-    cdcd_epbuf_t     *p_epbuf = &_cdcd_epbuf[i];
-
     p_cdc->wanted_char = (char) -1;
 
     // default line coding is : stop bit = 1, parity = none, data bits = 8
@@ -278,14 +262,23 @@ void cdcd_init(void) {
     p_cdc->line_coding.parity = 0;
     p_cdc->line_coding.data_bits = 8;
 
+  #if CFG_TUD_EDPT_DEDICATED_HWFIFO
+    uint8_t *epout_buf = NULL;
+    uint8_t *epin_buf  = NULL;
+  #else
+    cdcd_epbuf_t *p_epbuf   = &_cdcd_epbuf[i];
+    uint8_t      *epout_buf = p_epbuf->epout;
+    uint8_t      *epin_buf  = p_epbuf->epin;
+  #endif
+
     tu_edpt_stream_init(&p_cdc->stream.rx, false, false, false, p_cdc->stream.rx_ff_buf, CFG_TUD_CDC_RX_BUFSIZE,
-                        p_epbuf->epout, CFG_TUD_CDC_EP_BUFSIZE);
+                        epout_buf, CFG_TUD_CDC_EP_BUFSIZE);
 
     // TX fifo can be configured to change to overwritable if not connected (DTR bit not set). Without DTR we do not
     // know if data is actually polled by terminal. This way the most current data is prioritized.
     // Default: is overwritable
     tu_edpt_stream_init(&p_cdc->stream.tx, false, true, _cdcd_cfg.tx_overwritabe_if_not_connected,
-                        p_cdc->stream.tx_ff_buf, CFG_TUD_CDC_TX_BUFSIZE, p_epbuf->epin, CFG_TUD_CDC_EP_BUFSIZE);
+                        p_cdc->stream.tx_ff_buf, CFG_TUD_CDC_TX_BUFSIZE, epin_buf, CFG_TUD_CDC_EP_BUFSIZE);
   }
 }
 
@@ -481,11 +474,35 @@ bool cdcd_xfer_cb(uint8_t rhport, uint8_t ep_addr, xfer_result_t result, uint32_
   if (ep_addr == stream_rx->ep_addr) {
     tu_edpt_stream_read_xfer_complete(stream_rx, xferred_bytes);
 
-    // Check for wanted char and invoke wanted callback (multiple times if multiple wanted received)
+    // Check for wanted char and invoke wanted callback
     if (((signed char)p_cdc->wanted_char) != -1) {
-      for (uint32_t i = 0; i < xferred_bytes; i++) {
-        if ((p_cdc->wanted_char == (char)stream_rx->ep_buf[i]) && !tu_edpt_stream_empty(stream_rx)) {
-          tud_cdc_rx_wanted_cb(itf, p_cdc->wanted_char);
+      tu_fifo_buffer_info_t buf_info;
+      tu_fifo_get_read_info(&stream_rx->ff, &buf_info);
+
+      // find backward
+      uint8_t *ptr;
+      if (buf_info.wrapped.len > 0) {
+        ptr = buf_info.wrapped.ptr + buf_info.wrapped.len - 1; // last byte of wrap buffer
+      } else if (buf_info.linear.len > 0) {
+        ptr = buf_info.linear.ptr + buf_info.linear.len - 1;   // last byte of linear buffer
+      } else {
+        ptr = NULL;                                      // no data
+      }
+
+      if (ptr != NULL) {
+        for (uint32_t i = 0; i < xferred_bytes; i++) {
+          if (p_cdc->wanted_char == (char)*ptr) {
+            tud_cdc_rx_wanted_cb(itf, p_cdc->wanted_char);
+            break; // only invoke once per transfer, even if multiple wanted chars are present
+          }
+
+          if (ptr == buf_info.wrapped.ptr) {
+            ptr = buf_info.linear.ptr + buf_info.linear.len - 1; // last byte of linear buffer
+          } else if (ptr == buf_info.linear.ptr) {
+            break;                                         // reached the beginning
+          } else {
+            ptr--;
+          }
         }
       }
     }