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| 1 | - | moved to https://pastebin.com/PhSU0kPc |
| 1 | + | // This assumes PRUSS is clocked at 200 MHz, which is its typical clock frequency. |
| 2 | // | |
| 3 | // A more generic version of this code for any frequency and period: https://pastebin.com/rBR4v35a | |
| 4 | ||
| 5 | // Initialization from python (using py-uio): | |
| 6 | // pruss.ecap.pwm.initialize( 200000000 ) # 1 second period | |
| 7 | ||
| 8 | struct Timestamp {
| |
| 9 | uint32_t s; | |
| 10 | uint32_t ns; | |
| 11 | }; | |
| 12 | ||
| 13 | // Returns timestamp in seconds and nanoseconds (with 5ns precision). | |
| 14 | // Must be called at least once every second to ensure correct timekeeping. | |
| 15 | struct Timestamp timestamp() | |
| 16 | {
| |
| 17 | static struct Timestamp now = { 0, 0 };
| |
| 18 | uint32_t ns = CT_ECAP.TSCTR * 5; | |
| 19 | if( ns < now.ns ) // ecap counter has wrapped | |
| 20 | ++now.s; | |
| 21 | now.ns = ns; | |
| 22 | return now; | |
| 23 | } |
