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-rw-r--r--lib/stm32/desig.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/stm32/desig.c b/lib/stm32/desig.c
index 0743dc8..ea861aa 100644
--- a/lib/stm32/desig.c
+++ b/lib/stm32/desig.c
@@ -35,3 +35,25 @@ void desig_get_unique_id(u32 result[])
result[1] = bits63_32;
result[2] = bits31_16 << 16 | bits15_0;
}
+
+void desig_get_unique_id_as_string(char *string,
+ unsigned int string_len)
+{
+ int i, len;
+ u8 device_id[12];
+ static const char chars[] = "0123456789ABCDEF";
+
+ desig_get_unique_id((u32 *)device_id);
+
+ /* Each byte produces two characters */
+ len = (2 * sizeof(device_id) < string_len) ?
+ 2 * sizeof(device_id) : string_len - 1;
+
+ for (i = 0; i < len; i += 2) {
+ string[i] = chars[(device_id[i / 2] >> 0) & 0x0F];
+ string[i + 1] = chars[(device_id[i / 2] >> 4) & 0x0F];
+ }
+
+ string[len] = '\0';
+}
+