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AN4099 Datasheet(PDF) 16 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) 16 Page - STMicroelectronics

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Infrared transmitter
AN4099
16/39
Doc ID 023110 Rev 2
2.2.3
SIRC encoder solution
SIRC encoding mechanism
Figure 13.
SIRC send frame flowchart
After generating the binary format frame, each logical bit is converted to a combination of "0"
and "1" which represents a pulse width modulation format.
For example, a logical "1" takes 1.8 ms to transmit with 1.2 ms high level and 600 µs as low
level. The chosen base time is 600 µs, so the logical "1" is converted to 110.
For a logical "0", it takes 1.2 ms with 600 µs as high level and 600 µs as low level. It is
converted to 10 (refer to Figure 14).
Figure 14.
SIRC logical bit conversion
Force the TIM16
Output1 to inactive
level
Begin send SIRC frame
Increment BitsSent_Counter variable
If the bit to be sent is 1
Force the TIM16
Output1 to active
level
Yes
No
End
Generate the binary format of SIRC12 frame
Transform the binary data frame from MSB to
LSB
Convert the binary data to a pulse width
modulation format of the message
Check if all bits are sent
Yes
No
MS30804V1
Logical1
1.8 ms
Logical0
1.2 ms
MS30807V1
11
0
1
0



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