moo / Mbed 2 deprecated bit-band

bit-band test

Dependencies:   mbed

Fork of bit-band by vics66@...

main.cpp@1:95cec43280f9, 2014-06-03 (annotated)

Committer:
moo
Date:
Tue Jun 03 21:14:03 2014 +0000
Revision:
1:95cec43280f9
Parent:
0:cd40794dcbe8 
bit-band test

Who changed what in which revision?

UserRevisionLine numberNew contents of line
moo 1:95cec43280f9 1 /*
moo 1:95cec43280f9 2 * bit-band test
moo 1:95cec43280f9 3 */
moo 1:95cec43280f9 4
moo 0:cd40794dcbe8 5 #include "mbed.h"
moo 0:cd40794dcbe8 6
moo 0:cd40794dcbe8 7 DigitalOut led1(LED1);
moo 0:cd40794dcbe8 8
moo 1:95cec43280f9 9 extern "C" void HardFault_Handler()
moo 1:95cec43280f9 10 {
moo 1:95cec43280f9 11 __nop();
moo 1:95cec43280f9 12 }
moo 0:cd40794dcbe8 13
moo 0:cd40794dcbe8 14 int main()
moo 0:cd40794dcbe8 15 {
moo 1:95cec43280f9 16 volatile int *a1 = (int*)(0x10000000); // SRAM先頭アドレス
moo 1:95cec43280f9 17 *a1 = 0x1; // Memory windowにて0x1 → 0x0になることを確認した
moo 1:95cec43280f9 18 *a1 = 0x0;
moo 0:cd40794dcbe8 19
moo 1:95cec43280f9 20 volatile int *a2 = (int*)(0x22000000); // SRAM先頭アドレスをbit-band-aliasで指定
moo 1:95cec43280f9 21 *a2 = 0x1; // Memory windowにて0x10000000を見ても0x1になることを確認出来ない
moo 0:cd40794dcbe8 22
moo 1:95cec43280f9 23 __nop(); // この行を実行するとHardFault_Handler()に飛ぶ
moo 1:95cec43280f9 24 __nop();
moo 0:cd40794dcbe8 25 while (1);
moo 1:95cec43280f9 26 }