Switch from stdio to direct TinyUSB CDC, drop cstdio from w6300

usb.cpp

@@ -0,0 +1,82 @@
+#include <cstring>
+#include "pico/unique_id.h"
+#include "tusb.h"
+
+constexpr uint16_t USB_VID = 0x2E8A;
+constexpr uint16_t USB_PID = 0x000A;
+
+static constexpr tusb_desc_device_t desc_device = {
+    sizeof(tusb_desc_device_t),
+    TUSB_DESC_DEVICE,
+    0x0200,
+    TUSB_CLASS_MISC,
+    MISC_SUBCLASS_COMMON,
+    MISC_PROTOCOL_IAD,
+    CFG_TUD_ENDPOINT0_SIZE,
+    USB_VID,
+    USB_PID,
+    0x0100,
+    1, 2, 3,
+    1,
+};
+
+enum { ITF_NUM_CDC, ITF_NUM_CDC_DATA, ITF_NUM_TOTAL };
+
+constexpr uint8_t EPNUM_CDC_NOTIF = 0x81;
+constexpr uint8_t EPNUM_CDC_OUT   = 0x02;
+constexpr uint8_t EPNUM_CDC_IN    = 0x82;
+constexpr uint16_t CONFIG_TOTAL_LEN = TUD_CONFIG_DESC_LEN + TUD_CDC_DESC_LEN;
+
+static uint8_t const desc_configuration[] = {
+    TUD_CONFIG_DESCRIPTOR(1, ITF_NUM_TOTAL, 0, CONFIG_TOTAL_LEN, 0x00, 100),
+    TUD_CDC_DESCRIPTOR(ITF_NUM_CDC, 0, EPNUM_CDC_NOTIF, 8, EPNUM_CDC_OUT, EPNUM_CDC_IN, 64),
+};
+
+static constexpr const char* string_desc[] = {
+    "\x09\x04",
+    "picomap",
+    "picomap",
+    nullptr,
+};
+
+static uint16_t desc_str_buf[33];
+
+extern "C" {
+
+uint8_t const* tud_descriptor_device_cb(void) {
+    return reinterpret_cast<uint8_t const*>(&desc_device);
+}
+
+uint8_t const* tud_descriptor_configuration_cb(uint8_t index) {
+    return desc_configuration;
+}
+
+uint16_t const* tud_descriptor_string_cb(uint8_t index, uint16_t langid) {
+    uint8_t chr_count;
+
+    if (index == 0) {
+        memcpy(&desc_str_buf[1], string_desc[0], 2);
+        chr_count = 1;
+    } else if (index == 3) {
+        pico_unique_board_id_t uid;
+        pico_get_unique_board_id(&uid);
+        chr_count = 0;
+        for (int i = 0; i < 8; i++) {
+            desc_str_buf[1 + chr_count++] = "0123456789ABCDEF"[uid.id[i] >> 4];
+            desc_str_buf[1 + chr_count++] = "0123456789ABCDEF"[uid.id[i] & 0xF];
+        }
+    } else {
+        if (index >= sizeof(string_desc) / sizeof(string_desc[0])) return nullptr;
+        const char* str = string_desc[index];
+        if (!str) return nullptr;
+        chr_count = strlen(str);
+        if (chr_count > 31) chr_count = 31;
+        for (uint8_t i = 0; i < chr_count; i++)
+            desc_str_buf[1 + i] = str[i];
+    }
+
+    desc_str_buf[0] = static_cast<uint16_t>((TUSB_DESC_STRING << 8) | (2 * chr_count + 2));
+    return desc_str_buf;
+}
+
+} // extern "C"