stm32/usbd_msc_interface: Allow configuring the MSC inquiry response.

This was previously hard-coded to "MicroPy" / "pyboard Flash" / "1.00".

Now allow it to be overridden by a board.

This work was funded through GitHub Sponsors.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

ports/stm32/mpconfigboard_common.h

@@ -256,6 +256,21 @@
 #define MICROPY_HW_USB_INTERFACE_FS_STRING      "Pyboard Interface"
 #endif
 
+// Must be 8 bytes.
+#ifndef MICROPY_HW_USB_MSC_INQUIRY_VENDOR_STRING
+#define MICROPY_HW_USB_MSC_INQUIRY_VENDOR_STRING "MicroPy "
+#endif
+
+// Must be 16 bytes.
+#ifndef MICROPY_HW_USB_MSC_INQUIRY_PRODUCT_STRING
+#define MICROPY_HW_USB_MSC_INQUIRY_PRODUCT_STRING "pyboard Flash   "
+#endif
+
+// Must be 4 bytes.
+#ifndef MICROPY_HW_USB_MSC_INQUIRY_REVISION_STRING
+#define MICROPY_HW_USB_MSC_INQUIRY_REVISION_STRING "1.00"
+#endif
+
 // Amount of incoming buffer space for each CDC instance.
 // This must be 2 or greater, and a power of 2.
 #ifndef MICROPY_HW_USB_CDC_RX_DATA_SIZE

ports/stm32/usbd_msc_interface.c

@@ -90,20 +90,17 @@ STATIC const uint8_t usbd_msc_vpd83[4] = {
     0x00, 0x00, // page length (additional bytes beyond this entry)
 };
 
-STATIC const int8_t usbd_msc_inquiry_data[36] = {
-    0x00, // peripheral qualifier; peripheral device type
-    0x80, // 0x00 for a fixed drive, 0x80 for a removable drive
-    0x02, // version
-    0x02, // response data format
-    (STANDARD_INQUIRY_DATA_LEN - 5), // additional length
-    0x00, // various flags
-    0x00, // various flags
-    0x00, // various flags
-    'M', 'i', 'c', 'r', 'o', 'P', 'y', ' ', // Manufacturer : 8 bytes
-    'p', 'y', 'b', 'o', 'a', 'r', 'd', ' ', // Product      : 16 Bytes
-    'F', 'l', 'a', 's', 'h', ' ', ' ', ' ',
-    '1', '.', '0', '0',                     // Version      : 4 Bytes
-};
+STATIC const int8_t usbd_msc_inquiry_data[STANDARD_INQUIRY_DATA_LEN] = \
+    "\x00"          // peripheral qualifier; peripheral device type
+    "\x80"          // 0x00 for a fixed drive, 0x80 for a removable drive
+    "\x02"          // version
+    "\x02"          // response data format
+    "\x1f"          // 0x1f = (STANDARD_INQUIRY_DATA_LEN - 5) = 0x24 - 5
+    "\x00\x00\x00"  // various flags
+    MICROPY_HW_USB_MSC_INQUIRY_VENDOR_STRING   // 8 bytes
+    MICROPY_HW_USB_MSC_INQUIRY_PRODUCT_STRING  // 16 bytes
+    MICROPY_HW_USB_MSC_INQUIRY_REVISION_STRING // 4 bytes
+;
 
 // Set the logical units that will be exposed over MSC
 void usbd_msc_init_lu(size_t lu_n, const void *lu_data) {
@@ -210,6 +207,11 @@ STATIC int usbd_msc_Inquiry(uint8_t lun, const uint8_t *params, uint8_t *data_ou
         return -1;
     }
 
+    // These strings must be padded to the expected length. (+1 here for null terminator).
+    MP_STATIC_ASSERT(sizeof(MICROPY_HW_USB_MSC_INQUIRY_VENDOR_STRING) == 8 + 1);
+    MP_STATIC_ASSERT(sizeof(MICROPY_HW_USB_MSC_INQUIRY_PRODUCT_STRING) == 16 + 1);
+    MP_STATIC_ASSERT(sizeof(MICROPY_HW_USB_MSC_INQUIRY_REVISION_STRING) == 4 + 1);
+
     uint8_t alloc_len = params[3] << 8 | params[4];
     int len = MIN(sizeof(usbd_msc_inquiry_data), alloc_len);
     memcpy(data_out, usbd_msc_inquiry_data, len);