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OneWire_Masters/GPIO/owlink.s@31:7c684e49fa8f, 2016-03-29 (annotated)
- Committer:
- IanBenzMaxim
- Date:
- Tue Mar 29 16:36:12 2016 -0500
- Revision:
- 31:7c684e49fa8f
- Parent:
- 30:fdd7a0f82f2f
- Child:
- 40:590791ecac1c
Make compatible with GCC and armclang assemblers.
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| IanBenzMaxim | 31:7c684e49fa8f | 1 | #define PROC_CLOCK_MHZ 24 // Processor clock in MHz |
| IanBenzMaxim | 31:7c684e49fa8f | 2 | #define OVERHEAD_TUNING 21 // Fraction where OverheadTime(us) = OVERHEAD_TUNING / PROC_CLOCK_MHZ |
| IanBenzMaxim | 31:7c684e49fa8f | 3 | // Make PROC_CLOCK_MHZ and OVERHEAD_TUNING divisible by PROC_CYCLES_PER_LOOP for best results |
| IanBenzMaxim | 28:057bb14d3cee | 4 | |
| IanBenzMaxim | 31:7c684e49fa8f | 5 | #define PIPELINE_REFILL_PROC_CYCLES 1 // ARM specifies 1-3 cycles for pipeline refill following a branch |
| IanBenzMaxim | 31:7c684e49fa8f | 6 | #define PROC_CYCLES_PER_LOOP (2 + PIPELINE_REFILL_PROC_CYCLES) |
| IanBenzMaxim | 31:7c684e49fa8f | 7 | #define LOOPS_PER_US (PROC_CLOCK_MHZ / PROC_CYCLES_PER_LOOP) // Number of loop passes for a 1 us delay |
| IanBenzMaxim | 31:7c684e49fa8f | 8 | #define LOOPS_REMOVED_TUNING (OVERHEAD_TUNING / PROC_CYCLES_PER_LOOP) |
| IanBenzMaxim | 30:fdd7a0f82f2f | 9 | |
| IanBenzMaxim | 31:7c684e49fa8f | 10 | #if defined TOOLCHAIN_IAR |
| IanBenzMaxim | 30:fdd7a0f82f2f | 11 | SECTION owlink : CODE |
| IanBenzMaxim | 31:7c684e49fa8f | 12 | #elif defined TOOLCHAIN_ARM_STD |
| IanBenzMaxim | 29:5c51a17cfbf5 | 13 | AREA owlink, CODE |
| IanBenzMaxim | 31:7c684e49fa8f | 14 | #else // TOOLCHAIN_GCC_ARM |
| IanBenzMaxim | 31:7c684e49fa8f | 15 | .syntax unified |
| IanBenzMaxim | 31:7c684e49fa8f | 16 | .section .text |
| IanBenzMaxim | 30:fdd7a0f82f2f | 17 | #endif |
| IanBenzMaxim | 28:057bb14d3cee | 18 | |
| IanBenzMaxim | 31:7c684e49fa8f | 19 | // void ow_usdelay(unsigned int time_us) |
| IanBenzMaxim | 31:7c684e49fa8f | 20 | #ifdef TOOLCHAIN_GCC_ARM |
| IanBenzMaxim | 31:7c684e49fa8f | 21 | .thumb_func |
| IanBenzMaxim | 31:7c684e49fa8f | 22 | .global ow_usdelay |
| IanBenzMaxim | 31:7c684e49fa8f | 23 | ow_usdelay: |
| IanBenzMaxim | 31:7c684e49fa8f | 24 | #else // TOOLCHAIN_IAR or TOOLCHAIN_ARM_STD |
| IanBenzMaxim | 29:5c51a17cfbf5 | 25 | EXPORT ow_usdelay |
| IanBenzMaxim | 29:5c51a17cfbf5 | 26 | ow_usdelay |
| IanBenzMaxim | 31:7c684e49fa8f | 27 | #endif |
| IanBenzMaxim | 28:057bb14d3cee | 28 | mov R1, #LOOPS_PER_US |
| IanBenzMaxim | 28:057bb14d3cee | 29 | mul R0, R0, R1 |
| IanBenzMaxim | 28:057bb14d3cee | 30 | sub R0, R0, #LOOPS_REMOVED_TUNING |
| IanBenzMaxim | 31:7c684e49fa8f | 31 | #ifdef TOOLCHAIN_GCC_ARM |
| IanBenzMaxim | 31:7c684e49fa8f | 32 | loop: |
| IanBenzMaxim | 31:7c684e49fa8f | 33 | #else // TOOLCHAIN_IAR or TOOLCHAIN_ARM_STD |
| IanBenzMaxim | 29:5c51a17cfbf5 | 34 | loop |
| IanBenzMaxim | 31:7c684e49fa8f | 35 | #endif |
| IanBenzMaxim | 28:057bb14d3cee | 36 | subs R0, R0, #1 |
| IanBenzMaxim | 28:057bb14d3cee | 37 | bne loop |
| IanBenzMaxim | 28:057bb14d3cee | 38 | bx R14 |
| IanBenzMaxim | 28:057bb14d3cee | 39 | |
| IanBenzMaxim | 31:7c684e49fa8f | 40 | #ifdef TOOLCHAIN_GCC_ARM |
| IanBenzMaxim | 31:7c684e49fa8f | 41 | .end |
| IanBenzMaxim | 31:7c684e49fa8f | 42 | #else // TOOLCHAIN_IAR or TOOLCHAIN_ARM_STD |
| IanBenzMaxim | 31:7c684e49fa8f | 43 | END |
| IanBenzMaxim | 31:7c684e49fa8f | 44 | #endif |