[AUTOSAR + IO Architecture]

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1 layered

1.1 Application level

We usually Sensor/Actuator SWC Separate them , Form the following form .
So if there is any change in the hardware in the future , It is very convenient to modify our code .

The sensors and actuators on the hardware have been SWC The abstraction of , Just list and package the application algorithm separately , Even if the hardware changes later , You only need to modify the corresponding Sensor/ActuatorSWC that will do

1.2 Sensor signal flow

1.3 Actuator signal flow

1.4 Abstraction layer

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2 PORT

Configuration item ：

•	IO Port mode selection ：GPIO /  Function reuse 
•	IO The direction of the mouth ： Input  /  Output 
•	IO Whether the port is allowed to change direction during operation ： yes  /  no 
•	IO Initialization level of port ： high  /  low 
•	IO The conversion rate of the port 
•	IO Whether the mouth is pulled up ： yes  /  no 
•	IO Input threshold of port 
•	IO Drive mode of the port ： push-pull  /  Open a leak 
•	IO Read back support type of port ： level  , Output register value 

3 DIO( Digital input and output )

Configuration item ：

•	 use DIO to IO I changed my name , It's convenient for us to use later . 	
•	 to Channels grouping , Divide some channels with similar functions into a group for unified management .

4 PWM

Configuration item ：

•	 Hardware channel accessed 
•	PWM cycle 
•	PWM Duty cycle 
•	PWM Polarity ： high  /  low 
•	PWM Idle state ： high  /  low 
•	 Phase shift （Phase Shift）

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Edge count （Edge Count）

•	Icu_Init： ICU Initialization function for , Here, it is initialized to edge counting mode and double edge detection 
•	Icu_EnableEdgeCount：  Can make ICU Edge count , After that, it starts counting 
•	Icu_DisableEdgeCount：  prohibit ICU Edge count , The data will not be cleared and will remain 
•	Icu_GetEdgeNumbers：  Get current ICU Edge count value of 
•	Icu_ResetEdgeCount：  Reset ICU Count value 

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edge detection （Signal Edge Detection）

•	Icu_EnableNotification：  Enable notification function （ There is no notification function configured here, so it is invalid ）
•	Icu_GetInputState：  Get input status , The status is reset to IDLE
•	Icu_SetActivationCondition：  Change activation conditions , In the figure, the lower edge changes to the upper edge 
•	Icu_DisableNotification：  No notice 

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Signal measurement （Signal Measurement）

•	Icu_StartSignalMeasurement：  Start signal measurement function 
•	Icu_GetTimeElapsed：  Get the length of time 
•	Icu_GetDutyCycleValues：  In the past pwm The cycle and duty cycle of 

• Measure the signal duration ,
• Here is the duration of low level measurement , It can also measure high level , Note that only a complete measurable low level is valid （ That is to meet the two conditions of falling edge and rising edge ）
  
• Duration of measurement cycle
  
• measurement pwm Duty cycle

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Time stamp （Timestamping）

•	NotifyInterval（ Notification interval ） Trigger notification according to the set interval size ,
•	Icu_SetActivationCondition：  Set trigger conditions 
•	Icu_GetTimestampIndex：  Past current timestamp directory , That is, every time the cycle is cycled （ Here is a cycle from 0x0000->0xFFFF）, there Index Add one 
•	Icu_StartTimestamp：  Activate timestamp function , In linear Buffer In mode , once Buffer Full of , The recording of timestamp will be stopped , Need to activate again manually 

linear buffer

loop buffer

If we set the loop Buffer, Then you don't have to Icu_TimestampNotification_Ch1 Call in Icu_StartTimestamp This function , Then the timestamp function will continue . contrary , If it's linear Buffer, If not called , Will stop the function

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5 ICU( Input capture unit )

ICU：Input Capture Unit, Input capture unit . It mainly has the following functions ：

•	 Edge count 
•	 Edge detection and notification 
•	 Time stamp 
•	 Signal measurement 
•	 Used as a wake-up source 

API

•	Icu_Init： ICU Initialization function for , Here, it is initialized to edge counting mode and double edge detection 
•	Icu_EnableEdgeCount：  Can make ICU Edge count , After that, it starts counting 
•	Icu_DisableEdgeCount：  prohibit ICU Edge count , The data will not be cleared and will remain 
•	Icu_GetEdgeNumbers：  Get current ICU Edge count value of 
•	Icu_ResetEdgeCount：  Reset ICU Count value 

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6 OCU( Output comparison unit )

Output Compare Unit, Output comparison unit . Less used .

•	 Start or stop a comparison process 
•	 Set the comparison threshold 
•	 Enable or disable the notification mechanism 
•	 Get the count 
•	 Change the state of the output pin 
•	 Trigger hardware resources （ such as ADC,PWM etc. ）

7 ADC

Function as follows ：

•	 Convert analog signal to digital signal 
•	 Encapsulate the access interface of the converted signal 
•	 Configure different modes 
•	 A notification mechanism for transformation 

ADC convert group ：

• and IO The group is the same ,ADC You can also group （ADC Groups）,
• The main thing is to make some functions similar ADC channnels Divide into a group （ Each group contains at least one channel ）.
• It should be noted that a group must be in a ADC In the hardware unit , Cannot be composed across hardware units ADC Group

Conversion mode ：

• Cyclic conversion ： That is, the channels in a group are carried out in sequence ADC transformation , After one conversion, proceed to the next , Unless the user stops the conversion , Otherwise it will continue to cycle
• Single conversion ： The channels in the same group proceed in sequence ADC transformation , But stop directly after converting all channels of the Group , Unless the user enables the conversion again

Trigger mode ：

• Hardware trigger ： It is configured by the user , It can be triggered by other peripherals ADC Start conversion . For example, you can set a cycle timer , Triggered by the interrupt of the timer ADC, Or by IO The rising edge of the mouth triggers ADC.
• Software triggers ： Generally, we use , Are triggered by software API function , Writing this sentence directly triggers .

Buffer initialization ：

Flow mode ：

our ADC It can store sampling values at multiple times , And can coexist .
It is equivalent to applying for an array for each channel , This array can hold multiple ADC Sample value of

• Circulation patterns ： ** When FIFO Full of , Just start from scratch .** For example, the depth here is 2,ADC0_0_Ch0 It was recorded in our... For the first time ADC_SW_GRP_RES[0] in ,ADC0_0_Ch0 Enter the second time ADC_SW_GRP_RES[1] Inside , And then... Again ADC_SW_GRP_RES[0], In turn, cycle
• Linear mode ： ** When FIFO Full of , No more records .** That is to say ADC0_0_Ch0 The records are full of ADC_SW_GRP_RES[0] and ADC_SW_GRP_RES[1] Then it's no longer recorded