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Changed the unique id generation to be 8 characters long. This is so Mac OS X uses the the unique id for naming the device file instead of the location.

This commit is contained in:
Piotr Esden-Tempski 2012-01-16 22:54:37 -08:00
parent 53ebc6770e
commit a7f14e3cc0
1 changed files with 9 additions and 6 deletions
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15
src/stm32/cdcacm.c
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@ -350,7 +350,7 @@ static const struct usb_config_descriptor config = {
.interface = ifaces,
};
static char serial_no[25];
static char serial_no[9];
static const char *usb_strings[] = {
"x",
@ -532,17 +532,20 @@ void usb_lp_can_rx0_isr(void)
static char *get_dev_unique_id(char *s)
{
volatile uint8_t *unique_id = (volatile uint8_t *)0x1FFFF7E8;
volatile uint32_t *unique_id_p = (volatile uint32_t *)0x1FFFF7E8;
uint32_t unique_id = *unique_id_p +
*(unique_id_p + 1) +
*(unique_id_p + 2);
int i;
/* Fetch serial number from chip's unique ID */
for(i = 0; i < 24; i+=2) {
s[i] = ((*unique_id >> 4) & 0xF) + '0';
s[i+1] = (*unique_id++ & 0xF) + '0';
for(i = 0; i < 8; i++) {
s[7-i] = ((unique_id >> (4*i)) & 0xF) + '0';
}
for(i = 0; i < 24; i++)
for(i = 0; i < 8; i++)
if(s[i] > '9')
s[i] += 'A' - '9' - 1;
s[8] = 0;
return s;
}