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Fixed WEEK06

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This commit is contained in:
Kevin Thomas
2026-03-01 20:54:11 -05:00
parent f36217539e
commit d2685b03f2
5 changed files with 299 additions and 146 deletions
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WEEK06/WEEK06-02.md
+9 -7
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@@ -48,18 +48,20 @@ arm-none-eabi-gdb build/0x0014_static-variables.elf
##### Step 2: Find Where gpio_set_pulls is Called
From the tutorial, we know `gpio_set_pulls` is called at `0x10000250` with arguments for GPIO 15:
From the tutorial, we know `gpio_set_pulls` is called at `0x1000024e` with arguments for GPIO 15:
```gdb
(gdb) x/5i 0x1000024a
(gdb) x/5i 0x10000240
```
You should see:
```
0x1000024a: movs r0, #15 ; GPIO pin 15
0x10000240: movs r0, #15 ; GPIO pin 15
0x10000242: mov.w r3, #0 ; GPIO_IN (direction)
0x10000246: mcrr 0, 4, r0, r3, cr4 ; gpio_set_dir via coprocessor
0x1000024a: movs r2, #0 ; down = false
0x1000024c: movs r1, #1 ; up = true
0x1000024e: movs r2, #0 ; down = false
0x10000250: bl 0x100002dc ; gpio_set_pulls
0x1000024e: bl 0x100002d8 ; gpio_set_pulls
```
##### Step 3: Disassemble gpio_set_pulls
@@ -67,7 +69,7 @@ You should see:
Now examine the function itself:
```gdb
(gdb) x/30i 0x100002dc
(gdb) x/30i 0x100002d8
```
Study the disassembly carefully. Look for:
@@ -79,7 +81,7 @@ Study the disassembly carefully. Look for:
##### Step 4: Set a Breakpoint at gpio_set_pulls
```gdb
(gdb) b *0x100002dc
(gdb) b *0x100002d8
(gdb) monitor reset halt
(gdb) c
```