samr21: cpuid implemented by reading 128 bits from flash

RIOT-OS · Dec 15, 2014 · 9fafc45 · 9fafc45
1 parent 1c03805
commit 9fafc45
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Showing 3 changed files with 22 additions and 1 deletion.
diff --git a/boards/samr21-xpro/Makefile.features b/boards/samr21-xpro/Makefile.features
@@ -1 +1 @@
-FEATURES_PROVIDED += periph_gpio cpp
+FEATURES_PROVIDED += periph_gpio periph_cpuid cpp
diff --git a/cpu/samd21/include/cpu-conf.h b/cpu/samd21/include/cpu-conf.h
@@ -48,5 +48,9 @@
 /** @} */
 
 
+/**
+ * @brief CPUID_ID_LEN length of cpuid in bytes
+ */
+#define CPUID_ID_LEN (16) /* 128 bits long, 16 bytes long */
 #endif /* __CPU_CONF_H */
 /** @} */
diff --git a/cpu/samd21/periph/cpuid.c b/cpu/samd21/periph/cpuid.c
@@ -0,0 +1,17 @@
+
+#include <string.h>
+
+#include "cpu-conf.h"
+#include "periph/cpuid.h"
+
+#define Word0 (*(volatile uint32_t *)0x0080A00C)
+#define Word1 (*(volatile uint32_t *)0x0080A040)
+#define Word2 (*(volatile uint32_t *)0x0080A044)
+#define Word3 (*(volatile uint32_t *)0x0080A048)
+
+
+void cpuid_get(void *id)
+{
+ uint32_t source_address[] = {Word0, Word1, Word2, Word3};
+ memcpy(id, (void*) source_address, CPUID_ID_LEN);
+}