projects / sigrok-dumps.git / blame
| Commit | Line | Data |
|---|---|---|
| 82da1f4d PA |
1 | ------------------------------------------------------------------------------- |
| 2 | ARM ETM/ITM Tracing | |
| 3 | ------------------------------------------------------------------------------- | |
| 4 | ||
| 5 | This is an example capture from ARM Cortex-M3 ETM/ITM trace stream. | |
| 6 | ||
| 7 | The trace was captured from STM32F105 microcontroller while running | |
| 8 | this software (revision 5a1553c): | |
| 9 | https://github.com/PetteriAimonen/STM32_Trace_Example | |
| 10 | ||
| 11 | The example software outputs both ITM and ETM trace as follows: | |
| 12 | ||
| 13 | 1) The main loop blinks PC8 approx every 10 ms. | |
| 14 | On every blink it prints "On" and "Off" to ITM port 0. | |
| 15 | ||
| 16 | 2) TIM2 interrupt blinks PC9 approx every 6 ms. | |
| 17 | It is kept on for the duration of a bubble_sort() call. | |
| 18 | ETM tracing is enabled for the duration of that subroutine. | |
| 19 | Sort results are printed to ITM port 1. | |
| 20 | ||
| 21 | 3) DWT is continuously reporting exception status and periodically | |
| 22 | reporting PC values (these go to the ITM stream). | |
| 23 | ||
| 24 | Both ITM and ETM are mixed into the same stream by TPIU module | |
| 25 | ITM is configured as stream 1 and ETM as stream 2. | |
| 26 | ||
| 27 | Trace output is configured as 8 MHz UART protocol from TRACESWO pin. | |
| 28 | ||
| 29 | ||
| 30 | Logic analyzer setup | |
| 31 | -------------------- | |
| 32 | ||
| 33 | The logic analyzer used was an FX2 based device (at 24MHz): | |
| 34 | ||
| 35 | Probe STM32F105 | |
| 36 | --------------------- | |
| 37 | 3 PC9 | |
| 38 | 5 SWO | |
| 39 | 7 PC8 | |
| 40 | ||
| 41 | ||
| 42 | Data | |
| 43 | ---- | |
| 44 | ||
| 45 | Capture command: | |
| 46 | ||
| 47 | sigrok-cli -d fx2lafw -c samplerate=24MHz -C 4=SWO,2=PC9,6=PC8 -o trace_example.sr --time 50 | |
| 48 | ||
| 49 | Decoding command for ITM output: | |
| 50 | ||
| 51 | sigrok-cli -i trace_example.sr -P \ | |
| 52 | uart:rx=SWO:baudrate=8000000,arm_tpiu:stream=1,arm_itm:elffile=trace_example.elf | |
| 53 | ||
| 54 | Decoding command for ETM output: | |
| 55 | ||
| 56 | sigrok-cli -i trace_example.sr -P \ | |
| 57 | uart:rx=SWO:baudrate=8000000,arm_tpiu:stream=2,arm_etmv3:elffile=trace_example.elf | |
| 58 |