air105

This chapter describes how to use the mcu library of LuatOS

Introduction

mcu library encapsulates some special operations corresponding to mcu

Hardware preparation

Air105 Development Board

Software part

Interface documentation can be referred to:mcu library

Query main frequency

air105 Setting the main frequency is not supported, only querying the main frequency is supported.

The code is as follows

PROJECT = "mcu"
VERSION = "1.0.0"
sys = require("sys")
function test()
    log.info(PROJECT .. ".getClk", mcu.getClk())
end
sys.taskInit(test)
sys.run()

The log is as follows

I/user.mcu.getClk 192

Get Device Unique id

The code is as follows

PROJECT = "mcu"
VERSION = "1.0.0"
sys = require("sys")
function test()
    log.info(PROJECT .. ".unique_id", mcu.unique_id():toHex())
end
sys.taskInit(test)
sys.run()

The log is as follows

I/user.mcu.unique_id 31393033535138385400000000617603 32

Get the number of ticks after startup and the number of ticks per second

The code is as follows

PROJECT = "mcu"
VERSION = "1.0.0"
sys = require("sys")
local firstTick, secondTick = "0", "0"
function test()
    log.info(PROJECT .. ".ticks1", mcu.ticks())
    log.info(PROJECT .. ".hz", mcu.hz())
    sys.wait(5000)
    log.info(PROJECT .. ".ticks2", mcu.ticks())
end
sys.taskInit(test)
sys.run()

The log is as follows

I/user.mcu.ticks1 15
-- 1S 1000 One tick
I/user.mcu.hz 1000
-- There are 5000 more tick queries after 5S delay than the first query.tick
I/user.mcu.ticks2 5016

Convert decimal number to hexadecimal string output

The code is as follows

PROJECT = "mcu"
VERSION = "1.0.0"
sys = require("sys")
local firstTick, secondTick = "0", "0"
function test()
    -- Maximum conversion of 4 bytes of numbers
    log.info(PROJECT .. ".x32", mcu.x32(305419896)) -- 0x12345678
end
sys.taskInit(test)
sys.run()

The log is as follows

I/user.mcu.x32 0x12345678

Obtain the high-precision tick after startup and calculate the difference between the two ticks.

The code is as follows

PROJECT = "mcu"
VERSION = "1.0.0"
sys = require("sys")
function test()
    -- First acquisition tick
    local firstTck, tickPerUS = mcu.tick64()
    -- Wait 5s
    sys.wait(5000)
    -- Second acquisition tick
    local secondTick, tickPerUS = mcu.tick64()
    -- Print the number of ticks per 1us
    log.info(PROJECT .. ".tickPerUS", tickPerUS)
    local dtick64Res, dtick64Data = mcu.dtick64(secondTick, firstTck)
    log.info(PROJECT, "The difference between the two obtained ticks is ".. dtick64Data / 48 / 1000000 .." seconds")
end
sys.taskInit(test)
sys.run()

The log is as follows

-- 48 The duration of a tick is 1us
I/user.mcu.tickPerUS 48
I/user.mcu The difference between the two obtained ticks is 5.000287 seconds.