diff --git a/examples/timing_resources.rs b/examples/timing_resources.rs
index 193d633c25673d5aec853c1fe62514c3592f39de..6c00759987950a2af9c17be7a2c0ee99fade497d 100644
--- a/examples/timing_resources.rs
+++ b/examples/timing_resources.rs
@@ -40,9 +40,9 @@ const APP: () = {
rtic::pend(stm32f411::Interrupt::EXTI0);
asm::bkpt();
cx.resources.shared.lock(|shared| {
- // asm::bkpt();
+ asm::bkpt();
*shared += 1;
- // asm::bkpt();
+ asm::bkpt();
});
asm::bkpt();
}
@@ -72,6 +72,18 @@ const APP: () = {
// Explain what is happening here in your own words.
//
// [Your code here]
+// movw r1, #0 = Set registery r1 to 0.
+// mrs r0, basepri = Write the contents of the coprocessor register basepri to r0.
+// bkpt #0 = breakpoint
+// movt r1, #8192 = Set the fist 16-bits to 8192
+// ldrd r2, r3, [r1] =
+// adds r2, #1 = Adds one to r2.
+// adc r3, r3, #0 = Adds r3 and 0 with carry and stores it in r3.
+// strd r2, r3, [r1] =
+// msr basepri, r0 = Writes the value of r0 into coprocessor register basepri.
+// bx lr =
+//
+//
//
// > cargo run --example timing_resources --release --features nightly
// Then continue to the first breakpoint instruction:
@@ -91,10 +103,25 @@ const APP: () = {
// (gdb) x 0xe0001004
//
// [Your answer here]
+// 0xe0001004: 0x00000010
//
// (gdb) disassemble
//
// [Your answer here]
+// (gdb) disassemble
+// Dump of assembler code for function timing_resources::APP::EXTI0:
+// 0x08000232 <+0>: movw r1, #0
+// 0x08000236 <+4>: mrs r0, BASEPRI
+// => 0x0800023a <+8>: bkpt 0x0000
+// 0x0800023c <+10>: movt r1, #8192 ; 0x2000
+// 0x08000240 <+14>: ldrd r2, r3, [r1]
+// 0x08000244 <+18>: adds r2, #1
+// 0x08000246 <+20>: adc.w r3, r3, #0
+// 0x0800024a <+24>: strd r2, r3, [r1]
+// 0x0800024e <+28>: msr BASEPRI, r0
+// 0x08000252 <+32>: bx lr
+// End of assembler dump.
+//
//
// You should see that we hit the breakpoint in `exti0`, and
// that the code complies to the objdump EXTI disassembly.
@@ -102,10 +129,12 @@ const APP: () = {
// What was the software latency observed to enter the task?
//
// [Your answer here]
+// 16 - 2 = 14
//
// Does RTIC infer any overhead?
//
// [Your answer here]
+// Yes, it add 2 cycles. Because Cortex-M4 interupt takes 12 cycles.
//
// The debugger reports that the breakpoint was hit in the `run<closure>`.
// The reason is that the RTIC implements the actual interrupt handler,
@@ -124,6 +153,7 @@ const APP: () = {
// (gdb) x 0xe0001004
//
// [Your answer here]
+// 0xe0001004: 0x00000025
//
// You should have a total execution time in the range of 30-40 cycles.
//
@@ -131,6 +161,7 @@ const APP: () = {
// `exti0` was safe without locking the resource.
//
// [Your answer here]
+// TODO
//
// In `exti1` we also access `shared` but this time through a lock.
//
@@ -160,10 +191,12 @@ const APP: () = {
// (gdb) x 0xe0001004
//
// [Your answer here]
+// 0xe0001004: 0x00000034
//
// Calculate the total time (in cycles), for this section of code.
//
// [Your answer here]
+// 52 - 37 = 15
//
// You should get a value around 15 cycles.
//
@@ -204,6 +237,7 @@ const APP: () = {
// (gdb) x 0xe0001004
//
// [Your answer here]
+// 0xe0001004: 0x00000028
//
// (gdb) c
//
@@ -214,6 +248,7 @@ const APP: () = {
// (gdb) x 0xe0001004
//
// [Your answer here]
+// 0xe0001004: 0x00000032
//
// From a real-time perspective the critical section infers
// blocking (of higher priority tasks).
@@ -221,6 +256,7 @@ const APP: () = {
// How many clock cycles is the blocking?
//
// [Your answer here]
+// 50 - 40 = 10
//
// Finally continue out of the closure.
//
@@ -231,6 +267,7 @@ const APP: () = {
// (gdb) x 0xe0001004
//
// [Your answer here]
+// 0xe0001004: 0x00000034
//
// This is the total execution time of:
//
@@ -254,6 +291,7 @@ const APP: () = {
// Motivate your answer (not just a number).
//
// [Your answer here]
+// TODO
//
// Notice, the Rust implementation is significantly faster than the C code version
// of Real-Time For the Masses back in 2013.
@@ -264,3 +302,4 @@ const APP: () = {
// (Hint, what possible optimization can safely be applied by RTIC + Rust + LLVM.)
//
// [Your answer here]
+// TODO
diff --git a/timing_resources.objdump b/timing_resources.objdump
new file mode 100644
index 0000000000000000000000000000000000000000..821acf61dcd632a88fd0fc7dc81d2193f225545a
--- /dev/null
+++ b/timing_resources.objdump
@@ -0,0 +1,148 @@
+
+timing_resources: file format elf32-littlearm
+
+
+Disassembly of section .text:
+
+08000198 <Reset>:
+ 8000198: 80 b5 push {r7, lr}
+ 800019a: 6f 46 mov r7, sp
+ 800019c: 00 f0 aa f8 bl #340
+ 80001a0: 40 f2 08 00 movw r0, #8
+ 80001a4: 40 f2 00 01 movw r1, #0
+ 80001a8: c2 f2 00 00 movt r0, #8192
+ 80001ac: c2 f2 00 01 movt r1, #8192
+ 80001b0: 81 42 cmp r1, r0
+ 80001b2: 14 d2 bhs #40 <Reset+0x46>
+ 80001b4: 40 f2 00 01 movw r1, #0
+ 80001b8: 00 22 movs r2, #0
+ 80001ba: c2 f2 00 01 movt r1, #8192
+ 80001be: 41 f8 04 2b str r2, [r1], #4
+ 80001c2: 81 42 cmp r1, r0
+ 80001c4: 3c bf itt lo
+ 80001c6: 41 f8 04 2b strlo r2, [r1], #4
+ 80001ca: 81 42 cmplo r1, r0
+ 80001cc: 07 d2 bhs #14 <Reset+0x46>
+ 80001ce: 41 f8 04 2b str r2, [r1], #4
+ 80001d2: 81 42 cmp r1, r0
+ 80001d4: 03 d2 bhs #6 <Reset+0x46>
+ 80001d6: 41 f8 04 2b str r2, [r1], #4
+ 80001da: 81 42 cmp r1, r0
+ 80001dc: ef d3 blo #-34 <Reset+0x26>
+ 80001de: 40 f2 00 00 movw r0, #0
+ 80001e2: 40 f2 00 01 movw r1, #0
+ 80001e6: c2 f2 00 00 movt r0, #8192
+ 80001ea: c2 f2 00 01 movt r1, #8192
+ 80001ee: 81 42 cmp r1, r0
+ 80001f0: 1c d2 bhs #56 <Reset+0x94>
+ 80001f2: 40 f2 0c 31 movw r1, #780
+ 80001f6: 40 f2 00 02 movw r2, #0
+ 80001fa: c0 f6 00 01 movt r1, #2048
+ 80001fe: c2 f2 00 02 movt r2, #8192
+ 8000202: 0b 68 ldr r3, [r1]
+ 8000204: 42 f8 04 3b str r3, [r2], #4
+ 8000208: 82 42 cmp r2, r0
+ 800020a: 0f d2 bhs #30 <Reset+0x94>
+ 800020c: 4b 68 ldr r3, [r1, #4]
+ 800020e: 42 f8 04 3b str r3, [r2], #4
+ 8000212: 82 42 cmp r2, r0
+ 8000214: 0a d2 bhs #20 <Reset+0x94>
+ 8000216: 8b 68 ldr r3, [r1, #8]
+ 8000218: 42 f8 04 3b str r3, [r2], #4
+ 800021c: 82 42 cmp r2, r0
+ 800021e: 05 d2 bhs #10 <Reset+0x94>
+ 8000220: cb 68 ldr r3, [r1, #12]
+ 8000222: 10 31 adds r1, #16
+ 8000224: 42 f8 04 3b str r3, [r2], #4
+ 8000228: 82 42 cmp r2, r0
+ 800022a: ea d3 blo #-44 <Reset+0x6a>
+ 800022c: 00 f0 35 f8 bl #106
+ 8000230: fe de trap
+
+08000232 <EXTI0>:
+ 8000232: 40 f2 00 01 movw r1, #0
+ 8000236: ef f3 11 80 mrs r0, basepri
+ 800023a: 00 be bkpt #0
+ 800023c: c2 f2 00 01 movt r1, #8192
+ 8000240: d1 e9 00 23 ldrd r2, r3, [r1]
+ 8000244: 01 32 adds r2, #1
+ 8000246: 43 f1 00 03 adc r3, r3, #0
+ 800024a: c1 e9 00 23 strd r2, r3, [r1]
+ 800024e: 80 f3 11 88 msr basepri, r0
+ 8000252: 70 47 bx lr
+
+08000254 <EXTI1>:
+ 8000254: 41 f2 04 00 movw r0, #4100
+ 8000258: 00 21 movs r1, #0
+ 800025a: ce f2 00 00 movt r0, #57344
+ 800025e: 40 22 movs r2, #64
+ 8000260: 01 60 str r1, [r0]
+ 8000262: 4e f2 00 20 movw r0, #57856
+ 8000266: ce f2 00 00 movt r0, #57344
+ 800026a: 00 be bkpt #0
+ 800026c: 02 60 str r2, [r0]
+ 800026e: e0 20 movs r0, #224
+ 8000270: 00 be bkpt #0
+ 8000272: 80 f3 11 88 msr basepri, r0
+ 8000276: 40 f2 00 00 movw r0, #0
+ 800027a: c2 f2 00 00 movt r0, #8192
+ 800027e: d0 e9 00 23 ldrd r2, r3, [r0]
+ 8000282: 01 32 adds r2, #1
+ 8000284: 43 f1 00 03 adc r3, r3, #0
+ 8000288: c0 e9 00 23 strd r2, r3, [r0]
+ 800028c: f0 20 movs r0, #240
+ 800028e: 80 f3 11 88 msr basepri, r0
+ 8000292: 00 be bkpt #0
+ 8000294: 81 f3 11 88 msr basepri, r1
+ 8000298: 70 47 bx lr
+
+0800029a <main>:
+ 800029a: 4e f2 06 40 movw r0, #58374
+ 800029e: e0 21 movs r1, #224
+ 80002a0: ce f2 00 00 movt r0, #57344
+ 80002a4: 72 b6 cpsid i
+ 80002a6: 40 22 movs r2, #64
+ 80002a8: 01 70 strb r1, [r0]
+ 80002aa: 4e f2 00 11 movw r1, #57600
+ 80002ae: ce f2 00 01 movt r1, #57344
+ 80002b2: 0a 60 str r2, [r1]
+ 80002b4: f0 22 movs r2, #240
+ 80002b6: 42 70 strb r2, [r0, #1]
+ 80002b8: 4e f6 10 52 movw r2, #60688
+ 80002bc: 80 20 movs r0, #128
+ 80002be: ce f2 00 02 movt r2, #57344
+ 80002c2: 08 60 str r0, [r1]
+ 80002c4: 13 68 ldr r3, [r2]
+ 80002c6: 43 f0 02 03 orr r3, r3, #2
+ 80002ca: 13 60 str r3, [r2]
+ 80002cc: d2 f8 ec 30 ldr.w r3, [r2, #236]
+ 80002d0: 43 f0 80 73 orr r3, r3, #16777216
+ 80002d4: c2 f8 ec 30 str.w r3, [r2, #236]
+ 80002d8: 41 f2 00 02 movw r2, #4096
+ 80002dc: ce f2 00 02 movt r2, #57344
+ 80002e0: 13 68 ldr r3, [r2]
+ 80002e2: 43 f0 01 03 orr r3, r3, #1
+ 80002e6: 13 60 str r3, [r2]
+ 80002e8: c1 f8 00 01 str.w r0, [r1, #256]
+ 80002ec: 62 b6 cpsie i
+ 80002ee: 30 bf wfi
+ 80002f0: fd e7 b #-6 <main+0x54>
+
+080002f2 <WWDG>:
+ 80002f2: fe e7 b #-4 <WWDG>
+
+080002f4 <__pre_init>:
+ 80002f4: 70 47 bx lr
+
+080002f6 <HardFaultTrampoline>:
+ 80002f6: 70 46 mov r0, lr
+ 80002f8: 04 21 movs r1, #4
+ 80002fa: 08 42 tst r0, r1
+ 80002fc: 02 d1 bne #4 <HardFaultTrampoline+0xe>
+ 80002fe: ef f3 08 80 mrs r0, msp
+ 8000302: 02 e0 b #4 <HardFault_>
+ 8000304: ef f3 09 80 mrs r0, psp
+ 8000308: ff e7 b #-2 <HardFault_>
+
+0800030a <HardFault_>:
+ 800030a: fe e7 b #-4 <HardFault_>