shared/tinyusb: Allow max USB descriptor string to be configured.

Signed-off-by: Damien George <damien@micropython.org>

ports/rp2/usbd.c

@@ -38,7 +38,7 @@ void mp_usbd_port_get_serial_number(char *serial_buf) {
     pico_get_unique_board_id(&id);
     // convert to hex
     int hexlen = sizeof(id.id) * 2;
-    MP_STATIC_ASSERT(hexlen <= USBD_DESC_STR_MAX);
+    MP_STATIC_ASSERT(hexlen <= MICROPY_HW_USB_DESC_STR_MAX);
     for (int i = 0; i < hexlen; i += 2) {
         static const char *hexdig = "0123456789abcdef";
         serial_buf[i] = hexdig[id.id[i / 2] >> 4];

shared/tinyusb/mp_usbd.h

@@ -33,7 +33,7 @@
 void mp_usbd_task(void);
 
 // Function to be implemented in port code.
-// Can write a string up to USBD_DESC_STR_MAX characters long, plus terminating byte.
+// Can write a string up to MICROPY_HW_USB_DESC_STR_MAX characters long, plus terminating byte.
 extern void mp_usbd_port_get_serial_number(char *buf);
 
 #endif // MICROPY_INCLUDED_SHARED_TINYUSB_USBD_H

shared/tinyusb/mp_usbd_descriptor.c

@@ -67,8 +67,8 @@ const uint8_t mp_usbd_desc_cfg_static[USBD_STATIC_DESC_LEN] = {
 };
 
 const uint16_t *tud_descriptor_string_cb(uint8_t index, uint16_t langid) {
-    char serial_buf[USBD_DESC_STR_MAX + 1]; // Includes terminating NUL byte
-    static uint16_t desc_wstr[USBD_DESC_STR_MAX + 1]; // Includes prefix uint16_t
+    char serial_buf[MICROPY_HW_USB_DESC_STR_MAX + 1]; // Includes terminating NUL byte
+    static uint16_t desc_wstr[MICROPY_HW_USB_DESC_STR_MAX + 1]; // Includes prefix uint16_t
     const char *desc_str;
     uint16_t desc_len;
 
@@ -109,7 +109,7 @@ const uint16_t *tud_descriptor_string_cb(uint8_t index, uint16_t langid) {
 
         // Convert from narrow string to wide string
         desc_len = 2;
-        for (int i = 0; i < USBD_DESC_STR_MAX && desc_str[i] != 0; i++) {
+        for (int i = 0; i < MICROPY_HW_USB_DESC_STR_MAX && desc_str[i] != 0; i++) {
             desc_wstr[1 + i] = desc_str[i];
             desc_len += 2;
         }

shared/tinyusb/tusb_config.h

@@ -27,8 +27,7 @@
 #ifndef MICROPY_INCLUDED_SHARED_TINYUSB_TUSB_CONFIG_H
 #define MICROPY_INCLUDED_SHARED_TINYUSB_TUSB_CONFIG_H
 
-#include <py/mpconfig.h>
-#include "mpconfigport.h"
+#include "py/mpconfig.h"
 
 #if MICROPY_HW_ENABLE_USBDEV
 
@@ -90,7 +89,9 @@
 
 #define USBD_MAX_POWER_MA (250)
 
-#define USBD_DESC_STR_MAX (20)
+#ifndef MICROPY_HW_USB_DESC_STR_MAX
+#define MICROPY_HW_USB_DESC_STR_MAX (20)
+#endif
 
 #if CFG_TUD_CDC
 #define USBD_ITF_CDC (0) // needs 2 interfaces