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AN4099 Datasheet(PDF) 26 Page - STMicroelectronics

Part # AN4099
Description  Implementing transmitters and receivers for infrared remote control protocols using STM32F0xx and STM32F3xx microcontrollers
PDF  39 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4099 Datasheet(HTML) 26 Page - STMicroelectronics

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Infrared receiver
AN4099
26/39
Doc ID 023110 Rev 2
3.4
SIRC infrared control solution
3.4.1
Software implementation
Figure 21.
SIRC frame reception mechanism
TIMER interrupt: in PWM input mode
The TIMER is used to sample the different bits of the SIRC frame. We capture the current
timer value both at each falling and rising edges as well as generate an interrupt on both
edges. This feature makes it easy to measure the SIRC pulse whole and low times.
●
If the period measured is equal to T = 1200 µs and the low pulse duration is equal to
T/2 = 600 µs => the bit is logic "0".
●
If the period measured is equal to 3T/2 = 1800 µs and the low pulse duration is equal to
T = 1200 µs => the bit is logic "1".
●
If the whole period measured is equal to 3000 µs and the low pulse duration is equal to
2400 µs => the bit is "start bit".
Start
Bit1
1
Bit2
0
Bit9
1
Bit12
1
T: bit 0 time
2.4 ms
600μs
Non Inverted
SIRC frame
Inverted
SIRC frame:
IR module
output
Bit3
0
Bit4
1
Bit10
0
Bit11
1
A
B
A
A
A
A
A
A
A
A
A
B
B
B
B
B
B
B
B
MS18555V1



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