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-rw-r--r--examples/device/dfu/CMakeLists.txt15
-rw-r--r--examples/device/dfu/Makefile8
-rw-r--r--examples/device/dfu/skip.txt1
-rw-r--r--examples/device/dfu/src/main.c99
-rw-r--r--examples/device/dfu/src/usb_descriptors.c193
5 files changed, 185 insertions, 131 deletions
diff --git a/examples/device/dfu/CMakeLists.txt b/examples/device/dfu/CMakeLists.txt
index 3da8ee3df..61d169460 100644
--- a/examples/device/dfu/CMakeLists.txt
+++ b/examples/device/dfu/CMakeLists.txt
@@ -2,31 +2,28 @@ cmake_minimum_required(VERSION 3.20)
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)
+project(dfu C CXX ASM)
# Checks this example is valid for the family and initializes the project
-family_initialize_project(${PROJECT} ${CMAKE_CURRENT_LIST_DIR})
+family_initialize_project(${PROJECT_NAME} ${CMAKE_CURRENT_LIST_DIR})
# Espressif has its own cmake build system
if(FAMILY STREQUAL "espressif")
return()
endif()
-add_executable(${PROJECT})
+add_executable(${PROJECT_NAME})
# Example source
-target_sources(${PROJECT} PUBLIC
+target_sources(${PROJECT_NAME} PUBLIC
${CMAKE_CURRENT_SOURCE_DIR}/src/main.c
${CMAKE_CURRENT_SOURCE_DIR}/src/usb_descriptors.c
)
# Example include
-target_include_directories(${PROJECT} PUBLIC
+target_include_directories(${PROJECT_NAME} PUBLIC
${CMAKE_CURRENT_SOURCE_DIR}/src
)
# Configure compilation flags and libraries for the example without RTOS.
# See the corresponding function in hw/bsp/FAMILY/family.cmake for details.
-family_configure_device_example(${PROJECT} noos)
+family_configure_device_example(${PROJECT_NAME} noos)
diff --git a/examples/device/dfu/Makefile b/examples/device/dfu/Makefile
index 52a24cdb0..9e1eab4a2 100644
--- a/examples/device/dfu/Makefile
+++ b/examples/device/dfu/Makefile
@@ -1,14 +1,14 @@
-include ../../build_system/make/make.mk
+include ../../../hw/bsp/family_support.mk
INC += \
src \
- $(TOP)/hw \
+
# Example source
EXAMPLE_SOURCE = \
src/main.c \
src/usb_descriptors.c
-SRC_C += $(addprefix $(CURRENT_PATH)/, $(EXAMPLE_SOURCE))
+SRC_C += $(addprefix $(EXAMPLE_PATH)/, $(EXAMPLE_SOURCE))
-include ../../build_system/make/rules.mk
+include ../../../hw/bsp/family_rules.mk
diff --git a/examples/device/dfu/skip.txt b/examples/device/dfu/skip.txt
index 9dde06c30..ccff857ac 100644
--- a/examples/device/dfu/skip.txt
+++ b/examples/device/dfu/skip.txt
@@ -1,3 +1,2 @@
-mcu:TM4C123
mcu:BCM2835
family:espressif
diff --git a/examples/device/dfu/src/main.c b/examples/device/dfu/src/main.c
index c0c848837..fb3c22630 100644
--- a/examples/device/dfu/src/main.c
+++ b/examples/device/dfu/src/main.c
@@ -23,7 +23,7 @@
*
*/
- /*
+/*
* After device is enumerated in dfu mode run the following commands
*
* To transfer firmware from host to device (best to test with text file)
@@ -48,21 +48,18 @@
//--------------------------------------------------------------------+
// MACRO CONSTANT TYPEDEF PROTYPES
//--------------------------------------------------------------------+
-const char* upload_image[2]=
-{
- "Hello world from TinyUSB DFU! - Partition 0",
- "Hello world from TinyUSB DFU! - Partition 1"
-};
+const char *upload_image[2] = {"Hello world from TinyUSB DFU! - Partition 0",
+ "Hello world from TinyUSB DFU! - Partition 1"};
/* Blink pattern
* - 250 ms : device not mounted
* - 1000 ms : device mounted
* - 2500 ms : device is suspended
*/
-enum {
+enum {
BLINK_NOT_MOUNTED = 250,
- BLINK_MOUNTED = 1000,
- BLINK_SUSPENDED = 2500,
+ BLINK_MOUNTED = 1000,
+ BLINK_SUSPENDED = 2500,
};
static uint32_t blink_interval_ms = BLINK_NOT_MOUNTED;
@@ -70,21 +67,16 @@ static uint32_t blink_interval_ms = BLINK_NOT_MOUNTED;
void led_blinking_task(void);
/*------------- MAIN -------------*/
-int main(void)
-{
+int main(void) {
board_init();
// init device stack on configured roothub port
- tusb_rhport_init_t dev_init = {
- .role = TUSB_ROLE_DEVICE,
- .speed = TUSB_SPEED_AUTO
- };
+ tusb_rhport_init_t dev_init = {.role = TUSB_ROLE_DEVICE, .speed = TUSB_SPEED_AUTO};
tusb_init(BOARD_TUD_RHPORT, &dev_init);
board_init_after_tusb();
- while (1)
- {
+ while (1) {
tud_task(); // tinyusb device task
led_blinking_task();
}
@@ -95,29 +87,25 @@ int main(void)
//--------------------------------------------------------------------+
// Invoked when device is mounted
-void tud_mount_cb(void)
-{
+void tud_mount_cb(void) {
blink_interval_ms = BLINK_MOUNTED;
}
// Invoked when device is unmounted
-void tud_umount_cb(void)
-{
+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;
+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)
-{
+void tud_resume_cb(void) {
blink_interval_ms = tud_mounted() ? BLINK_MOUNTED : BLINK_NOT_MOUNTED;
}
@@ -129,19 +117,17 @@ void tud_resume_cb(void)
// Invoked right before tud_dfu_download_cb() (state=DFU_DNBUSY) or tud_dfu_manifest_cb() (state=DFU_MANIFEST)
// Application return timeout in milliseconds (bwPollTimeout) for the next download/manifest operation.
// During this period, USB host won't try to communicate with us.
-uint32_t tud_dfu_get_timeout_cb(uint8_t alt, uint8_t state)
-{
- if ( state == DFU_DNBUSY )
- {
+uint32_t tud_dfu_get_timeout_cb(uint8_t alt, uint8_t state) {
+ if (state == DFU_DNBUSY) {
// For this example
// - Atl0 Flash is fast : 1 ms
// - Alt1 EEPROM is slow: 100 ms
return (alt == 0) ? 1 : 100;
- }
- else if (state == DFU_MANIFEST)
- {
+ } else if (state == DFU_MANIFEST) {
// since we don't buffer entire image and do any flashing in manifest stage
return 0;
+ } else {
+ // nothing to do
}
return 0;
@@ -150,15 +136,13 @@ uint32_t tud_dfu_get_timeout_cb(uint8_t alt, uint8_t state)
// Invoked when received DFU_DNLOAD (wLength>0) following by DFU_GETSTATUS (state=DFU_DNBUSY) requests
// This callback could be returned before flashing op is complete (async).
// Once finished flashing, application must call tud_dfu_finish_flashing()
-void tud_dfu_download_cb(uint8_t alt, uint16_t block_num, uint8_t const* data, uint16_t length)
-{
- (void) alt;
- (void) block_num;
+void tud_dfu_download_cb(uint8_t alt, uint16_t block_num, const uint8_t *data, uint16_t length) {
+ (void)alt;
+ (void)block_num;
//printf("\r\nReceived Alt %u BlockNum %u of length %u\r\n", alt, wBlockNum, length);
- for(uint16_t i=0; i<length; i++)
- {
+ for (uint16_t i = 0; i < length; i++) {
printf("%c", data[i]);
}
@@ -169,9 +153,8 @@ void tud_dfu_download_cb(uint8_t alt, uint16_t block_num, uint8_t const* data, u
// Invoked when download process is complete, received DFU_DNLOAD (wLength=0) following by DFU_GETSTATUS (state=Manifest)
// Application can do checksum, or actual flashing if buffered entire image previously.
// Once finished flashing, application must call tud_dfu_finish_flashing()
-void tud_dfu_manifest_cb(uint8_t alt)
-{
- (void) alt;
+void tud_dfu_manifest_cb(uint8_t alt) {
+ (void)alt;
printf("Download completed, enter manifestation\r\n");
// flashing op for manifest is complete without error
@@ -182,27 +165,28 @@ void tud_dfu_manifest_cb(uint8_t alt)
// Invoked when received DFU_UPLOAD request
// Application must populate data with up to length bytes and
// Return the number of written bytes
-uint16_t tud_dfu_upload_cb(uint8_t alt, uint16_t block_num, uint8_t* data, uint16_t length)
-{
- (void) block_num;
- (void) length;
+uint16_t tud_dfu_upload_cb(uint8_t alt, uint16_t block_num, uint8_t *data, uint16_t length) {
+ (void)block_num;
+ (void)length;
- uint16_t const xfer_len = (uint16_t) strlen(upload_image[alt]);
+ if (block_num != 0u) {
+ return 0; // for this example we only support single block upload
+ }
+
+ const uint16_t xfer_len = tu_min16((uint16_t)strlen(upload_image[alt]), length);
memcpy(data, upload_image[alt], xfer_len);
return xfer_len;
}
// Invoked when the Host has terminated a download or upload transfer
-void tud_dfu_abort_cb(uint8_t alt)
-{
- (void) alt;
+void tud_dfu_abort_cb(uint8_t alt) {
+ (void)alt;
printf("Host aborted transfer\r\n");
}
// Invoked when a DFU_DETACH request is received
-void tud_dfu_detach_cb(void)
-{
+void tud_dfu_detach_cb(void) {
printf("Host detach, we should probably reboot\r\n");
}
@@ -210,13 +194,14 @@ void tud_dfu_detach_cb(void)
// BLINKING TASK + Indicator pulse
//--------------------------------------------------------------------+
-void led_blinking_task(void)
-{
- static uint32_t start_ms = 0;
- static bool led_state = false;
+void led_blinking_task(void) {
+ static uint32_t start_ms = 0;
+ static bool led_state = false;
// Blink every interval ms
- if ( board_millis() - start_ms < blink_interval_ms) return; // not enough time
+ if (tusb_time_millis_api() - start_ms < blink_interval_ms) {
+ return; // not enough time
+ }
start_ms += blink_interval_ms;
board_led_write(led_state);
diff --git a/examples/device/dfu/src/usb_descriptors.c b/examples/device/dfu/src/usb_descriptors.c
index fd469aaf2..e4291be2d 100644
--- a/examples/device/dfu/src/usb_descriptors.c
+++ b/examples/device/dfu/src/usb_descriptors.c
@@ -25,7 +25,6 @@
#include "bsp/board_api.h"
#include "tusb.h"
-#include "class/dfu/dfu_device.h"
/* A combination of interfaces must have a unique product id, since PC will save device driver after the first plug.
* Same VID/PID with different interface e.g MSC (first), then CDC (later) will possibly cause system error on PC.
@@ -33,49 +32,45 @@
* Auto ProductID layout's Bitmap:
* [MSB] HID | MSC | CDC [LSB]
*/
-#define _PID_MAP(itf, n) ( (CFG_TUD_##itf) << (n) )
-#define USB_PID (0x4000 | _PID_MAP(CDC, 0) | _PID_MAP(MSC, 1) | _PID_MAP(HID, 2) | \
- _PID_MAP(MIDI, 3) | _PID_MAP(VENDOR, 4) )
+#define PID_MAP(itf, n) ((CFG_TUD_##itf) ? (1 << (n)) : 0)
+#define USB_PID (0x4000 | PID_MAP(CDC, 0) | PID_MAP(MSC, 1) | PID_MAP(HID, 2) | PID_MAP(MIDI, 3) | PID_MAP(VENDOR, 4))
//--------------------------------------------------------------------+
// Device Descriptors
//--------------------------------------------------------------------+
-tusb_desc_device_t const desc_device =
-{
- .bLength = sizeof(tusb_desc_device_t),
- .bDescriptorType = TUSB_DESC_DEVICE,
- .bcdUSB = 0x0200,
+static const tusb_desc_device_t desc_device =
+ {.bLength = sizeof(tusb_desc_device_t),
+ .bDescriptorType = TUSB_DESC_DEVICE,
+ .bcdUSB = 0x0201,
- #if CFG_TUD_CDC
- // Use Interface Association Descriptor (IAD) for CDC
- // As required by USB Specs IAD's subclass must be common class (2) and protocol must be IAD (1)
- .bDeviceClass = TUSB_CLASS_MISC,
- .bDeviceSubClass = MISC_SUBCLASS_COMMON,
- .bDeviceProtocol = MISC_PROTOCOL_IAD,
- #else
- .bDeviceClass = 0x00,
- .bDeviceSubClass = 0x00,
- .bDeviceProtocol = 0x00,
- #endif
+#if CFG_TUD_CDC
+ // Use Interface Association Descriptor (IAD) for CDC
+ // As required by USB Specs IAD's subclass must be common class (2) and protocol must be IAD (1)
+ .bDeviceClass = TUSB_CLASS_MISC,
+ .bDeviceSubClass = MISC_SUBCLASS_COMMON,
+ .bDeviceProtocol = MISC_PROTOCOL_IAD,
+#else
+ .bDeviceClass = 0x00,
+ .bDeviceSubClass = 0x00,
+ .bDeviceProtocol = 0x00,
+#endif
- .bMaxPacketSize0 = CFG_TUD_ENDPOINT0_SIZE,
+ .bMaxPacketSize0 = CFG_TUD_ENDPOINT0_SIZE,
- .idVendor = 0xCafe,
- .idProduct = USB_PID,
- .bcdDevice = 0x0100,
+ .idVendor = 0xCafe,
+ .idProduct = USB_PID,
+ .bcdDevice = 0x0100,
- .iManufacturer = 0x01,
- .iProduct = 0x02,
- .iSerialNumber = 0x03,
+ .iManufacturer = 0x01,
+ .iProduct = 0x02,
+ .iSerialNumber = 0x03,
- .bNumConfigurations = 0x01
-};
+ .bNumConfigurations = 0x01};
// Invoked when received GET DEVICE DESCRIPTOR
// Application return pointer to descriptor
-uint8_t const * tud_descriptor_device_cb(void)
-{
- return (uint8_t const *) &desc_device;
+const uint8_t *tud_descriptor_device_cb(void) {
+ return (const uint8_t *)&desc_device;
}
//--------------------------------------------------------------------+
@@ -83,20 +78,17 @@ uint8_t const * tud_descriptor_device_cb(void)
//--------------------------------------------------------------------+
// Number of Alternate Interface (each for 1 flash partition)
-#define ALT_COUNT 2
+#define ALT_COUNT 2
-enum
-{
+enum {
ITF_NUM_DFU_MODE,
ITF_NUM_TOTAL
};
-#define CONFIG_TOTAL_LEN (TUD_CONFIG_DESC_LEN + TUD_DFU_DESC_LEN(ALT_COUNT))
+#define CONFIG_TOTAL_LEN (TUD_CONFIG_DESC_LEN + TUD_DFU_DESC_LEN(ALT_COUNT))
+#define FUNC_ATTRS (DFU_ATTR_CAN_UPLOAD | DFU_ATTR_CAN_DOWNLOAD | DFU_ATTR_MANIFESTATION_TOLERANT)
-#define FUNC_ATTRS (DFU_ATTR_CAN_UPLOAD | DFU_ATTR_CAN_DOWNLOAD | DFU_ATTR_MANIFESTATION_TOLERANT)
-
-uint8_t const desc_configuration[] =
-{
+uint8_t const desc_configuration[] = {
// Config number, interface count, string index, total length, attribute, power in mA
TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_TOTAL_LEN, 0x00, 100),
@@ -107,13 +99,91 @@ uint8_t const desc_configuration[] =
// Invoked when received GET CONFIGURATION DESCRIPTOR
// Application return pointer to descriptor
// Descriptor contents must exist long enough for transfer to complete
-uint8_t const * tud_descriptor_configuration_cb(uint8_t index)
-{
- (void) index; // for multiple configurations
+const uint8_t *tud_descriptor_configuration_cb(uint8_t index) {
+ (void)index; // for multiple configurations
return desc_configuration;
}
//--------------------------------------------------------------------+
+// BOS Descriptor
+//--------------------------------------------------------------------+
+
+/* Microsoft OS 2.0 registry property descriptor
+ Per MS requirements https://msdn.microsoft.com/en-us/library/windows/hardware/hh450799(v=vs.85).aspx
+ device should create DeviceInterfaceGUIDs. It can be done by driver and
+ in case of real PnP solution device should expose MS "Microsoft OS 2.0
+ registry property descriptor". Such descriptor can insert any record
+ into Windows registry per device/configuration/interface. In our case it
+ will insert "DeviceInterfaceGUIDs" multistring property.
+ GUID is freshly generated and should be OK to use.
+ https://developers.google.com/web/fundamentals/native-hardware/build-for-webusb/
+ (Section Microsoft OS compatibility descriptors)
+*/
+
+#define BOS_TOTAL_LEN (TUD_BOS_DESC_LEN + TUD_BOS_MICROSOFT_OS_DESC_LEN)
+#define MS_OS_20_DESC_LEN 0xA2
+#define VENDOR_REQUEST_MICROSOFT 1
+
+// BOS Descriptor is required for webUSB
+const uint8_t desc_bos[] = {
+ // total length, number of device caps
+ TUD_BOS_DESCRIPTOR(BOS_TOTAL_LEN, 1),
+
+ // Microsoft OS 2.0 descriptor
+ TUD_BOS_MS_OS_20_DESCRIPTOR(MS_OS_20_DESC_LEN, 1)};
+
+const uint8_t *tud_descriptor_bos_cb(void) {
+ return desc_bos;
+}
+
+const uint8_t desc_ms_os_20[] = {
+ // Set header: length, type, windows version, total length
+ U16_TO_U8S_LE(0x000A), U16_TO_U8S_LE(MS_OS_20_SET_HEADER_DESCRIPTOR), U32_TO_U8S_LE(0x06030000),
+ U16_TO_U8S_LE(MS_OS_20_DESC_LEN),
+
+ // MS OS 2.0 Compatible ID descriptor: length, type, compatible ID, sub compatible ID
+ U16_TO_U8S_LE(0x0014), U16_TO_U8S_LE(MS_OS_20_FEATURE_COMPATBLE_ID), 'W', 'I', 'N', 'U', 'S', 'B', 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // sub-compatible
+
+ // MS OS 2.0 Registry property descriptor: length, type
+ U16_TO_U8S_LE(MS_OS_20_DESC_LEN - 0x0A - 0x14), U16_TO_U8S_LE(MS_OS_20_FEATURE_REG_PROPERTY),
+ U16_TO_U8S_LE(0x0007), U16_TO_U8S_LE(0x002A),// wPropertyDataType, wPropertyNameLength and PropertyName "DeviceInterfaceGUIDs\0" in UTF-16
+ 'D', 0x00, 'e', 0x00, 'v', 0x00, 'i', 0x00, 'c', 0x00, 'e', 0x00, 'I', 0x00, 'n', 0x00, 't', 0x00, 'e', 0x00,
+ 'r', 0x00, 'f', 0x00, 'a', 0x00, 'c', 0x00, 'e', 0x00, 'G', 0x00, 'U', 0x00, 'I', 0x00, 'D', 0x00, 's', 0x00, 0x00, 0x00,
+ U16_TO_U8S_LE(0x0050),// wPropertyDataLength
+ //bPropertyData: {3E7E0711-DF3B-4158-A32F-E5951B2AB9A1}.
+ '{', 0x00, '3', 0x00, 'E', 0x00, '7', 0x00, 'E', 0x00, '0', 0x00, '7', 0x00, '1', 0x00, '1', 0x00, '-', 0x00,
+ 'D', 0x00, 'F', 0x00, '3', 0x00, 'B', 0x00, '-', 0x00, '4', 0x00, '1', 0x00, '5', 0x00, '8', 0x00, '-', 0x00,
+ 'A', 0x00, '3', 0x00, '2', 0x00, 'F', 0x00, '-', 0x00, 'E', 0x00, '5', 0x00, '9', 0x00, '5', 0x00, '1', 0x00,
+ 'B', 0x00, '2', 0x00, 'A', 0x00, 'B', 0x00, '9', 0x00, 'A', 0x00, '1', 0x00, '}', 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+TU_VERIFY_STATIC(sizeof(desc_ms_os_20) == MS_OS_20_DESC_LEN, "Incorrect size");
+
+// Invoked when a control transfer occurred on an interface of this class
+// Driver response accordingly to the request and the transfer stage (setup/data/ack)
+// return false to stall control endpoint (e.g unsupported request)
+bool tud_vendor_control_xfer_cb(uint8_t rhport, uint8_t stage, const tusb_control_request_t *request) {
+ // nothing to with DATA & ACK stage
+ if (stage != CONTROL_STAGE_SETUP) {
+ return true;
+ }
+
+ if (request->bmRequestType_bit.type == TUSB_REQ_TYPE_VENDOR) {
+ if (request->bRequest == VENDOR_REQUEST_MICROSOFT) {
+ if (request->wIndex == 7) {
+ return tud_control_xfer(rhport, request, (void *)(uintptr_t)desc_ms_os_20, MS_OS_20_DESC_LEN);
+ } else {
+ return false;
+ }
+ }
+ }
+
+ // stall unknown request
+ return false;
+}
+
+//--------------------------------------------------------------------+
// String Descriptors
//--------------------------------------------------------------------+
@@ -126,25 +196,24 @@ enum {
};
// array of pointer to string descriptors
-char const *string_desc_arr[] =
-{
- (const char[]) { 0x09, 0x04 }, // 0: is supported language is English (0x0409)
- "TinyUSB", // 1: Manufacturer
- "TinyUSB Device", // 2: Product
- NULL, // 3: Serials will use unique ID if possible
- "FLASH", // 4: DFU Partition 1
- "EEPROM", // 5: DFU Partition 2
+static const char *string_desc_arr[] = {
+ (const char[]){0x09, 0x04}, // 0: is supported language is English (0x0409)
+ "TinyUSB", // 1: Manufacturer
+ "TinyUSB Device", // 2: Product
+ NULL, // 3: Serials will use unique ID if possible
+ "FLASH", // 4: DFU Partition 1
+ "EEPROM", // 5: DFU Partition 2
};
static uint16_t _desc_str[32 + 1];
// Invoked when received GET STRING DESCRIPTOR request
// Application return pointer to descriptor, whose contents must exist long enough for transfer to complete
-uint16_t const *tud_descriptor_string_cb(uint8_t index, uint16_t langid) {
- (void) langid;
+const uint16_t *tud_descriptor_string_cb(uint8_t index, uint16_t langid) {
+ (void)langid;
size_t chr_count;
- switch ( index ) {
+ switch (index) {
case STRID_LANGID:
memcpy(&_desc_str[1], string_desc_arr[0], 2);
chr_count = 1;
@@ -158,24 +227,28 @@ uint16_t const *tud_descriptor_string_cb(uint8_t index, uint16_t langid) {
// Note: the 0xEE index string is a Microsoft OS 1.0 Descriptors.
// https://docs.microsoft.com/en-us/windows-hardware/drivers/usbcon/microsoft-defined-usb-descriptors
- if ( !(index < sizeof(string_desc_arr) / sizeof(string_desc_arr[0])) ) return NULL;
+ if (!(index < sizeof(string_desc_arr) / sizeof(string_desc_arr[0]))) {
+ return NULL;
+ }
const char *str = string_desc_arr[index];
// Cap at max char
- chr_count = strlen(str);
- size_t const max_count = sizeof(_desc_str) / sizeof(_desc_str[0]) - 1; // -1 for string type
- if ( chr_count > max_count ) chr_count = max_count;
+ chr_count = strlen(str);
+ const size_t max_count = sizeof(_desc_str) / sizeof(_desc_str[0]) - 1; // -1 for string type
+ if (chr_count > max_count) {
+ chr_count = max_count;
+ }
// Convert ASCII string into UTF-16
- for ( size_t i = 0; i < chr_count; i++ ) {
+ for (size_t i = 0; i < chr_count; i++) {
_desc_str[1 + i] = str[i];
}
break;
}
// first byte is length (including header), second byte is string type
- _desc_str[0] = (uint16_t) ((TUSB_DESC_STRING << 8) | (2 * chr_count + 2));
+ _desc_str[0] = (uint16_t)((TUSB_DESC_STRING << 8) | (2 * chr_count + 2));
return _desc_str;
}