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.. | ||
armgcc | ||
board.c | ||
board.h | ||
clock_config.c | ||
clock_config.h | ||
i2s_interrupt_transfer_v3_14.xml | ||
i2s_interrupt_transfer.c | ||
music.h | ||
pin_mux.c | ||
pin_mux.h | ||
readme.md |
Overview
The I2S example project uses one I2S interface to continuously playback the sine wave to output.
SDK version
- Version: 2.15.000
Toolchain supported
- IAR embedded Workbench 9.40.1
- Keil MDK 5.38.1
- GCC ARM Embedded 12.2
- MCUXpresso 11.8.0
Hardware requirements
- Mini/micro USB cable
- LPCXpresso55s69 board
- Personal Computer
- headphones with 3.5 mm stereo jack
- source of sound (line output to 3.5 mm stereo jack)
Prepare the Demo
Note: MCUXpresso IDE project default debug console is semihost
- Connect headphones to Audio HP / Line-Out connector.
- Connect a micro USB cable between the PC host and the CMSIS DAP USB port (P6) on the board
- Open a serial terminal with the following settings :
- 115200 baud rate
- 8 data bits
- No parity
- One stop bit
- No flow control
- Download the program to the target board.
- Either press the reset button on your board or launch the debugger in your IDE to begin running the demo.
Running the demo
Headphones will play a sine wave sound. This demo outputs 450HZ sine wave audio signal. The log below shows example output of the I2S driver demo in the terminal window:
Configure I2C
Configure codec
Configure I2S
Setup looping playback of sine wave
Modify i2s_interrupt_transfer.c to change condition to call StartDigitalLoopback() instead of StartSoundPlayback() function. Headphones will play what is input into Audio Line-In connector. Terminal window will show:
Configure codec
Configure I2S
Setup digital loopback