Merge pull request hathach#2105 from kholia/cdc_uac2_example

Add CDC+UAC2 composite device example for Pico

Author: hathach

examples/device/CMakeLists.txt

@@ -13,6 +13,7 @@ family_add_subdirectory(board_test)
 family_add_subdirectory(cdc_dual_ports)
 family_add_subdirectory(cdc_msc)
 family_add_subdirectory(cdc_msc_freertos)
+family_add_subdirectory(cdc_uac2)
 family_add_subdirectory(dfu)
 family_add_subdirectory(dfu_runtime)
 family_add_subdirectory(dynamic_configuration)

examples/device/cdc_uac2/CMakeLists.txt

@@ -0,0 +1,38 @@
+cmake_minimum_required(VERSION 3.17)
+
+include(${CMAKE_CURRENT_SOURCE_DIR}/../../../hw/bsp/family_support.cmake)
+
+# gets PROJECT name for the example (e.g. <BOARD>-<DIR_NAME>)
+family_get_project_name(PROJECT ${CMAKE_CURRENT_LIST_DIR})
+
+project(${PROJECT} C CXX ASM)
+
+# Checks this example is valid for the family and initializes the project
+family_initialize_project(${PROJECT} ${CMAKE_CURRENT_LIST_DIR})
+
+# Espressif has its own cmake build system
+if(FAMILY STREQUAL "espressif")
+  return()
+endif()
+
+add_executable(${PROJECT})
+
+# Example source
+target_sources(${PROJECT} PUBLIC
+  ${CMAKE_CURRENT_SOURCE_DIR}/src/cdc_app.c
+  ${CMAKE_CURRENT_SOURCE_DIR}/src/main.c
+  ${CMAKE_CURRENT_SOURCE_DIR}/src/uac2_app.c
+  ${CMAKE_CURRENT_SOURCE_DIR}/src/usb_descriptors.c
+  )
+
+# Example include
+target_include_directories(${PROJECT} PUBLIC
+  ${CMAKE_CURRENT_SOURCE_DIR}/src
+  )
+
+# Configure compilation flags and libraries for the example... see the corresponding function
+# in hw/bsp/FAMILY/family.cmake for details.
+family_configure_device_example(${PROJECT} noos)
+
+# Uncomment me to enable UART based debugging
+# pico_enable_stdio_uart(${PROJECT} 1)

examples/device/cdc_uac2/Makefile

@@ -0,0 +1,16 @@
+include ../../make.mk
+
+INC += \
+	src \
+	$(TOP)/hw \
+
+# Example source
+EXAMPLE_SOURCE += \
+  src/cdc_app.c \
+  src/main.c \
+  src/uac2_app.c \
+  src/usb_descriptors.c \
+
+SRC_C += $(addprefix $(CURRENT_PATH)/, $(EXAMPLE_SOURCE))
+
+include ../../rules.mk

examples/device/cdc_uac2/README.md

@@ -0,0 +1,52 @@
+#### Composite CDC + UAC2 on Pico
+
+This example provides a composite CDC + UAC2 device on top of a Raspberry Pi
+Pico board.
+
+
+#### Use Cases
+
+- The CDC + UAC2 composite device happens to be important, especially in the
+  amateur radio community.
+
+  Modern radios (`rigs`) like Icom IC-7300 + IC-705 expose a sound card and a
+  serial device (`composite device`) to the computer over a single USB cable.
+  This allows for Audio I/O and CAT control over a single USB cable which is
+  very convenient.
+
+  By including and maintaining this example in TinyUSB repository, we enable
+  the amateur radio community to build (`homebrew`) radios with similar
+  functionality as the (expensive) commercial rigs.
+
+  This PR is important in bridging this specific gap between the commercial
+  rigs and homebrew equipment.
+
+- https://digirig.net/digirig-mobile-rev-1-9/ is a digital interface for
+  interfacing radios (that lack an inbuilt digital interface) with computers.
+  Digirig Mobile works brilliantly (is OSS!) and is a big improvement over
+  traditional digital interfaces (like the SignaLink USB Interface). By using a
+  Raspberry Pi Pico powered CDC + UAC2 composite device, we can simplify the
+  Digirig Mobile schematic, drastically reduce the manufacturing cost, and
+  (again) enable the homebrewers community to homebrew a modern digital interface
+  with ease themselves.
+
+
+#### Build Steps
+
+```
+cd examples/device/cdc_uac2
+
+export PICO_SDK_PATH=$HOME/pico-sdk
+
+cmake -DFAMILY=rp2040 pico .
+
+cmake -DFAMILY=rp2040 -DCMAKE_BUILD_TYPE=Debug # use this for debugging
+
+make BOARD=raspberry_pi_pico all
+```
+
+
+#### Development Notes
+
+Please try to keep this code synchronized with the `uac2_headset` example
+included in this repository.

examples/device/cdc_uac2/src/cdc_app.c

@@ -0,0 +1,72 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Ha Thach (tinyusb.org)
+ * Copyright (c) 2022 Angel Molina ([email protected])
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ */
+
+#include "bsp/board.h"
+#include "tusb.h"
+#include "common.h"
+
+// Invoked when cdc when line state changed e.g connected/disconnected
+void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts)
+{
+  (void) itf;
+  (void) rts;
+
+  if (dtr)
+  {
+    // Terminal connected
+  }
+  else
+  {
+    // Terminal disconnected
+  }
+}
+
+// Invoked when CDC interface received data from host
+void tud_cdc_rx_cb(uint8_t itf)
+{
+  uint8_t buf[64];
+  uint32_t count;
+
+  // connected() check for DTR bit
+  // Most but not all terminal client set this when making connection
+  if (tud_cdc_connected())
+  {
+    if (tud_cdc_available()) // data is available
+    {
+      count = tud_cdc_n_read(itf, buf, sizeof(buf));
+      (void) count;
+
+      tud_cdc_n_write(itf, buf, count);
+      tud_cdc_n_write_flush(itf);
+      // dummy code to check that cdc serial is responding
+      board_led_write(0);
+      board_delay(50);
+      board_led_write(1);
+      board_delay(50);
+      board_led_write(0);
+    }
+  }
+}

examples/device/cdc_uac2/src/common.h

@@ -0,0 +1,34 @@
+#ifndef __COMMON_H__
+#define __COMMON_H__
+
+/* Blink pattern
+ * - 25 ms   : streaming data
+ * - 250 ms  : device not mounted
+ * - 1000 ms : device mounted
+ * - 2500 ms : device is suspended
+ */
+enum
+{
+  BLINK_STREAMING = 25,
+  BLINK_NOT_MOUNTED = 250,
+  BLINK_MOUNTED = 1000,
+  BLINK_SUSPENDED = 2500,
+};
+
+enum
+{
+  VOLUME_CTRL_0_DB = 0,
+  VOLUME_CTRL_10_DB = 2560,
+  VOLUME_CTRL_20_DB = 5120,
+  VOLUME_CTRL_30_DB = 7680,
+  VOLUME_CTRL_40_DB = 10240,
+  VOLUME_CTRL_50_DB = 12800,
+  VOLUME_CTRL_60_DB = 15360,
+  VOLUME_CTRL_70_DB = 17920,
+  VOLUME_CTRL_80_DB = 20480,
+  VOLUME_CTRL_90_DB = 23040,
+  VOLUME_CTRL_100_DB = 25600,
+  VOLUME_CTRL_SILENCE = 0x8000,
+};
+
+#endif

examples/device/cdc_uac2/src/main.c

@@ -0,0 +1,99 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Jerzy Kasenberg
+ * Copyright (c) 2022 Angel Molina <[email protected]>
+ * Copyright (c) 2023 Dhiru Kholia <[email protected]>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "bsp/board.h"
+#include "tusb.h"
+#include "common.h"
+
+extern uint32_t blink_interval_ms;
+
+#if (CFG_TUSB_MCU == OPT_MCU_RP2040)
+#include "pico/stdlib.h"
+#endif
+
+void led_blinking_task(void);
+
+/*------------- MAIN -------------*/
+int main(void)
+{
+  board_init();
+
+  // init device stack on configured roothub port
+  tud_init(BOARD_TUD_RHPORT);
+
+#if (CFG_TUSB_MCU == OPT_MCU_RP2040)
+  stdio_init_all();
+#endif
+
+  TU_LOG1("CDC UAC2 example running\r\n");
+
+  while (1)
+  {
+    tud_task(); // TinyUSB device task
+    led_blinking_task();
+
+#if (CFG_TUSB_MCU == OPT_MCU_RP2040)
+    // printf("Hello, world!\n");
+#endif
+  }
+
+  return 0;
+}
+
+//--------------------------------------------------------------------+
+// Device callbacks
+//--------------------------------------------------------------------+
+
+// Invoked when device is mounted
+void tud_mount_cb(void)
+{
+  blink_interval_ms = BLINK_MOUNTED;
+}
+
+// Invoked when device is unmounted
+void tud_umount_cb(void)
+{
+  blink_interval_ms = BLINK_NOT_MOUNTED;
+}
+
+// Invoked when usb bus is suspended
+// remote_wakeup_en : if host allow us  to perform remote wakeup
+// Within 7ms, device must draw an average of current less than 2.5 mA from bus
+void tud_suspend_cb(bool remote_wakeup_en)
+{
+  (void)remote_wakeup_en;
+  blink_interval_ms = BLINK_SUSPENDED;
+}
+
+// Invoked when usb bus is resumed
+void tud_resume_cb(void)
+{
+  blink_interval_ms = BLINK_MOUNTED;
+}