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AN4099 bảng dữ liệu(PDF) 11 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Implementing transmitters and receivers for infrared remote control protocols using STM32F0xx and STM32F3xx microcontrollers
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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AN4099 bảng dữ liệu(HTML) 11 Page - STMicroelectronics

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AN4099
Infrared transmitter
Doc ID 023110 Rev 2
11/39
Figure 8.
Hardware description
2.2
IR transmitter: universal solution
The infrared transmitter solution based on the STM32 enables the user to send all RC5 and
SIRC instructions to all RC5 and SIRC receiver devices.
The application solution uses four peripherals.
●
IRTIM: (IR interface with timers) generates the IR signal using TIM16 and TIM17
–
TIM17: (Timer17) provides the carrier signal with a frequency of 36 kHz for RC5
and 40 kHz for the SIRC protocol.
–
TIM16: (Timer16) provides the main signal to be sent (RC5 Frame or SIRC
Frame).
●
GPIO: (general-purpose I/O) provides the I/O to be connected to the buttons of the
remote control and connected to the IR-LED.
●
CLK: (clock controller) enables the clocks and provides the correct clock frequency for
the timers.
To generate the infrared remote control signals, TIM16 channel 1 (TIM16_OC1) and TIM17
channel 1 (TIM17_OC1) must be properly configured to generate correct waveforms. All
standard IR pulse modulation modes can be obtained by programming the two timer output
compare channels. The infrared function is output on the TIM_IR pin. The activation of this
function is done through the GPIOx_AFRx register by enabling the related alternate function
bit (PB9 directly controls the Infrared LED).
The main program flow is shown in Figure 9.
MS30328V2
GPIO:
PB9
TIM16
envelop
TIM17
Carrier
R
R
VCC
IR
transmitter
STM32F0xx
STM32F3xx



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