moo
/
bit-band
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bit-band
by 
vics66@...
Revision 1:95cec43280f9, committed 2014-06-03
- Comitter:
- moo
- Date:
- Tue Jun 03 21:14:03 2014 +0000
- Parent:
- 0:cd40794dcbe8
- Commit message:
- bit-band test
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
diff -r cd40794dcbe8 -r 95cec43280f9 main.cpp
--- a/main.cpp Mon Jun 02 02:28:30 2014 +0000
+++ b/main.cpp Tue Jun 03 21:14:03 2014 +0000
@@ -1,17 +1,26 @@
+/*
+* bit-band test
+*/
+
#include "mbed.h"
DigitalOut led1(LED1);
-extern "C" void HardFault_Handler() {__nop();}
+extern "C" void HardFault_Handler()
+{
+ __nop();
+}
int main()
{
- volatile uint8_t *a1 = (uint8_t*)(0x10000000); // SRAM先頭アドレス
- *a1 = (uint8_t)0x1; // Memory windowsにて0x1になることを確認
+ volatile int *a1 = (int*)(0x10000000); // SRAM先頭アドレス
+ *a1 = 0x1; // Memory windowにて0x1 → 0x0になることを確認した
+ *a1 = 0x0;
- volatile uint8_t *a2 = (uint8_t*)(0x22000000); // SRAM先頭アドレスをbit-bandで指定
- *a2 = (uint8_t)0x0; // Memory windowsにて0x01になることを確認出来ない
+ volatile int *a2 = (int*)(0x22000000); // SRAM先頭アドレスをbit-band-aliasで指定
+ *a2 = 0x1; // Memory windowにて0x10000000を見ても0x1になることを確認出来ない
- led1 = *a1; // この行を実行するとHardFault_Handler()が実行される
+ __nop(); // この行を実行するとHardFault_Handler()に飛ぶ
+ __nop();
while (1);
-}
+}