AN4099 datasheet(24/39 Pages) STMICROELECTRONICS

24 / 39 page

Infrared receiver

AN4099

24/39

Doc ID 023110 Rev 2

} RC5_Frame_TypeDef ;

IR_RC5_decode () is executed when the RC5FrameReceived flag is equal to YES.

RC5_DeInit()

This function de-initializes the different peripherals (GPIO, TIMER...).

TIM2_IRQHandler ()

This function handles the TIM Capture Compare interrupt.

–

Timer Falling Edge Event: this is used to measure the period between two

successive falling edges (the entire pulse duration).

–

Timer Rising Edge Event: this is used to measure the duration between falling

and rising edges (the low pulse duration).

–

Update event (time-out event): this resets the RC5 packet. The Timer Overflow

is set to 3.7 ms.

The low pulse duration and the whole pulse duration are used to determine the bit

value. Each bit value is determined in relation to the last bit.

3.3.3

How to use the RC5 decoder driver

To use the RC5 decoder driver, proceed as follows.

–

Call the function RC5_Init() to configure the timer and GPIO hardware resources

needed for RC5 decoding.

–

TIM2 Capture Compare and Update interrupts are used to decode the RC5 frame,

if a frame is received correctly a global variable "RC5FrameReceived" is set to

inform the application.

–

The application should then call the function RC5_Decode() to retrieve the

received RC5 frame.

Code example

#include "rc5_decode.h"

/* IR_FRAME will hold the RC5 frame (Address, Command,...) */

RC5_Frame_TypeDef IR_FRAME;

/* Initialize the RC5 driver */

RC5_Init();

while(1)

{

/* Decode the received RC5 frame and store it in IR_FRAME variable

RC5_Decode(&IR_FRAME);

/* Here add the code that will process the just received frame, i.e.

IR_FRAME variable, otherwise it will be overwritten by the next frame

...

AN4099 데이터시트(PDF) 24 Page - STMicroelectronics

AN4099 데이터시트(HTML) 24 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

데이터시트 다운로드

링크 URL