AN4099 datasheet(11/39 Pages) 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

VCC

transmitter

STM32F0xx

STM32F3xx

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