mtimer_demo.rst

MTIMER - System Timer

This demo is based on a 64-bit timer (MTIMER) that comes with the risc-v kernel. This demo can provide reference for os tick.

Hardware Connection

None

Software Implementation

• See examples/systick for the software code

Note

The mtimer clock defaults to 1M after frequency division, which is convenient for later use and reduces calculation time.

void systick_isr()
{
    static uint32_t tick=0;
    tick++;
    MSG("tick:%d\r\n",tick);
}

bflb_platform_set_alarm_time(1000000,systick_isr);

• Use the above code to set the mtimer timing time to 1s, and register the interrupt callback function.

Compile and Program

• CDK compilation

  Open project:systick.cdkproj

  Refer to the steps of :ref:`windows_cdk_quick_start` to compile and download

• Command compilation

 $ cd <sdk_path>/bl_mcu_sdk
 $ make BOARD=bl706_iot APP=systick

• Program

  See :ref:`bl_dev_cube`

Experimental Phenomena

The tick value is incremented by 1 per second and printed through the serial port.