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generate the serial number same as DFU

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This commit is contained in:
Conor Patrick 2019-02-16 14:08:59 -05:00
parent de31924be3
commit 991530f88b
1 changed files with 18 additions and 17 deletions
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35
targets/stm32l432/lib/usbd/usbd_desc.c
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@ -166,28 +166,29 @@ uint8_t *USBD_HID_ManufacturerStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *l
*/ */
uint8_t *USBD_HID_SerialStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length) uint8_t *USBD_HID_SerialStrDescriptor(USBD_SpeedTypeDef speed, uint16_t *length)
{ {
// Match the same alg as the DFU to make serial number
volatile uint8_t * UUID = (volatile uint8_t *)0x1FFF7590; volatile uint8_t * UUID = (volatile uint8_t *)0x1FFF7590;
uint8_t uuid[12]; const char hexdigit[] = "0123456789ABCDEF";
uint8_t uuid_str[25]; uint8_t uuid[6];
char c; uint8_t uuid_str[13];
uint8_t c;
int i; int i;
uuid_str[24] = 0; uuid_str[12] = 0;
memmove(uuid,(uint8_t *)UUID,12);
uuid[0] = UUID[11];
uuid[1] = UUID[10] + UUID[2];
uuid[2] = UUID[9];
uuid[3] = UUID[8] + UUID[0];
uuid[4] = UUID[7];
uuid[5] = UUID[6];
// quick method to convert to hex string // quick method to convert to hex string
for (i = 0; i < 12; i++) for (i = 0; i < 6; i++)
{ {
c = uuid[i] & 0x0f; c = (uuid[i]>>4) & 0x0f;
if (c < 0x0a) uuid_str[i * 2 + 0] = hexdigit[ c ];
uuid_str[i * 2 + 1] = c + '0'; c = (uuid[i]>>0) & 0x0f;
else uuid_str[i * 2 + 1] = hexdigit[ c ];
uuid_str[i * 2 + 1] = c + 'A' - 0x0a;
c = (uuid[i] & 0xf0) >> 4;
if (c < 0x0a)
uuid_str[i * 2] = c + '0';
else
uuid_str[i * 2] = c + 'A' - 0x0a;
} }