1.0.0

src/usb_descriptors.c

@@ -0,0 +1,107 @@
+/*
+ * USBvalve - USB Descriptors for TinyUSB
+ *
+ * Composite device: CDC (serial) + MSC (mass storage)
+ *
+ */
+
+#include "tusb.h"
+#include "usb_config.h"
+
+//--------------------------------------------------------------------
+// Device Descriptor
+//--------------------------------------------------------------------
+static tusb_desc_device_t const desc_device = {
+    .bLength            = sizeof(tusb_desc_device_t),
+    .bDescriptorType    = TUSB_DESC_DEVICE,
+    .bcdUSB             = 0x0200, // USB 2.0
+    .bDeviceClass       = TUSB_CLASS_MISC,
+    .bDeviceSubClass    = MISC_SUBCLASS_COMMON,
+    .bDeviceProtocol    = MISC_PROTOCOL_IAD,
+    .bMaxPacketSize0    = CFG_TUD_ENDPOINT0_SIZE,
+    .idVendor           = USB_VENDORID,
+    .idProduct          = USB_PRODUCTID,
+    .bcdDevice          = 0x0100,
+    .iManufacturer      = 0x01,
+    .iProduct           = 0x02,
+    .iSerialNumber      = 0x03,
+    .bNumConfigurations = 0x01
+};
+
+uint8_t const* tud_descriptor_device_cb(void) {
+    return (uint8_t const*)&desc_device;
+}
+
+//--------------------------------------------------------------------
+// Configuration Descriptor
+//--------------------------------------------------------------------
+enum {
+    ITF_NUM_CDC = 0,
+    ITF_NUM_CDC_DATA,
+    ITF_NUM_MSC,
+    ITF_NUM_TOTAL
+};
+
+#define EPNUM_CDC_NOTIF  0x81
+#define EPNUM_CDC_OUT    0x02
+#define EPNUM_CDC_IN     0x82
+#define EPNUM_MSC_OUT    0x03
+#define EPNUM_MSC_IN     0x83
+
+#define CONFIG_TOTAL_LEN (TUD_CONFIG_DESC_LEN + TUD_CDC_DESC_LEN + TUD_MSC_DESC_LEN)
+
+static uint8_t const desc_configuration[] = {
+    // Config descriptor
+    TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_TOTAL_LEN, 0x00, 100),
+    // CDC: Interface Association + CDC Control + CDC Data
+    TUD_CDC_DESCRIPTOR(ITF_NUM_CDC, 4, EPNUM_CDC_NOTIF, 8, EPNUM_CDC_OUT, EPNUM_CDC_IN, 64),
+    // MSC
+    TUD_MSC_DESCRIPTOR(ITF_NUM_MSC, 5, EPNUM_MSC_OUT, EPNUM_MSC_IN, 64),
+};
+
+uint8_t const* tud_descriptor_configuration_cb(uint8_t index) {
+    (void)index;
+    return desc_configuration;
+}
+
+//--------------------------------------------------------------------
+// String Descriptors
+//--------------------------------------------------------------------
+static char const* string_desc_arr[] = {
+    [0] = (const char[]){0x09, 0x04},  // English
+    [1] = USB_MANUF,                    // Manufacturer
+    [2] = USB_DESCRIPTOR,               // Product
+    [3] = USB_SERIAL,                   // Serial
+    [4] = "USBvalve CDC",               // CDC Interface
+    [5] = "USBvalve MSC",               // MSC Interface
+};
+
+static uint16_t _desc_str[33];
+
+uint16_t const* tud_descriptor_string_cb(uint8_t index, uint16_t langid) {
+    (void)langid;
+
+    uint8_t chr_count;
+
+    if (index == 0) {
+        memcpy(&_desc_str[1], string_desc_arr[0], 2);
+        chr_count = 1;
+    } else {
+        if (index >= sizeof(string_desc_arr) / sizeof(string_desc_arr[0])) {
+            return NULL;
+        }
+
+        const char* str = string_desc_arr[index];
+        chr_count = strlen(str);
+        if (chr_count > 31) chr_count = 31;
+
+        for (uint8_t i = 0; i < chr_count; i++) {
+            _desc_str[1 + i] = str[i];
+        }
+    }
+
+    // First word is length (including header) and descriptor type
+    _desc_str[0] = (TUSB_DESC_STRING << 8) | (2 * chr_count + 2);
+
+    return _desc_str;
+}