mirror of
https://github.com/zephyrproject-rtos/zephyr
synced 2025-08-13 19:06:25 +00:00
0156511e71
referring the ARM's Systick driver, we did the following improvements:
* use 31 bits of 32-bit counter to avoid the rare but possible
overflow of elapsed(). If 32 bits val are used, elpased() may
return a wrong value. then wrong HW cycles.
* two ways to update the correct cycles
- through systick timer irq
- when systick timer irq cann't be handled because of irq
locked/disabled, call z_timer_cycle_get_32->elapsed to update
the correct cylces. no more than one counter-wrap is allowed.
* if elapsed() is not called too long (more than one counter-wrap) from
systick tiemr irq or from z_timer_cycle_get_32. The lost of HW cycles
is unavoidable.
* some detailed discussion can be found in #24332
Signed-off-by: Wayne Ren <wei.ren@synopsys.com>
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| .. | ||
| adc | ||
| audio | ||
| bluetooth | ||
| can | ||
| clock_control | ||
| console | ||
| counter | ||
| crypto | ||
| dac | ||
| debug | ||
| display | ||
| dma | ||
| eeprom | ||
| entropy | ||
| espi | ||
| ethernet | ||
| flash | ||
| gpio | ||
| hwinfo | ||
| i2c | ||
| i2s | ||
| ieee802154 | ||
| interrupt_controller | ||
| ipm | ||
| kscan | ||
| led | ||
| led_strip | ||
| lora | ||
| modem | ||
| net | ||
| neural_net | ||
| pcie | ||
| peci | ||
| pinmux | ||
| ps2 | ||
| ptp_clock | ||
| pwm | ||
| sensor | ||
| serial | ||
| spi | ||
| timer | ||
| usb | ||
| video | ||
| watchdog | ||
| wifi | ||
| CMakeLists.txt | ||
| Kconfig | ||