Hardware support package for Larduino
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hardware/LGT/avr cleanup Oct 19, 2017
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Ardunio Hardware Support Package for LGT8F's

Task status

  • PWM & Timers update
  • Fast_IO update
  • Analog Comparator
  • Differential Amplifier update
  • Computation Accelerator


Larduino_HSP is 3'rd party hardware support package for LGT8F core based arduino boards.
The backend of HSP fork from offical arduino distribution. We have try to keep all the standard
features compatible with arduino world. So feel free to resuse all of the libraries which designed for arduino platform.

Microcontroller based on LGT8F, e.g LGT8F328P has more advanced features which not
covered in standard arduino implementation. so there are also many new features merged to this
3'rd party package. Important update and new features as following:

  • External/Internal crystal can be selected at runtime
  • Fast_IO interface for fast I/O speed and small code size
  • Full configurable PWM features, including complementary and dead-band control
  • Differential Amplifier front-end for 12bit Analog-to-Digital converter
  • 1/2 channel 8bit Digtial-to-Analog output, campatible with analogWrite()
  • More standalone I/Os
Fast_IO code snippets
void setup() {
	//set D10 to output
	fastioMode(D10, OUTPUT);

	// driver D10 to low level
	fastioWrite(D10, LOW);

void loop() {
	// toggle D10
PWM code snippets : Solo mode
void setup() {
	// usage: pwmMode(pin, pwm_mode, freq_mode)
	// PWM_MODE_SOLO: set pwm of D5/D6 to independent mode
	// PWM_FREQ_FAST: set PWM to fast mode 

	// usage: pwmResolution(pin, res_bits)
	// set PWM resolution to 7bit
	pwmResolution(D5, 7);
	// or we can set PWM frequency directly
	// usage: pwmFrequency(pin, freq_in_hz)
	// pwmFrequency(D5, 500000);

	// usage: pwmWrite(pin, duty)
	// Note that we have set PWM resolution to 7bit
	pwmWrite(D5, 128 >> 1);
	pwmWrite(D6, 128 >> 2);
PWM code snippets : Duo/Complementary mode
// dead-band settings for complementary PWM
int deadBand = 8;
int dutyMax;

void setup() {
	// usage: pwmMode(pin, pwm_mode, freq_mode)
	// PWM_MODE_DUO1: set pwm of D5/D6 to DUO1 mode (complementary)
	// PWM_FREQ_FAST: set PWM to fast mode
	// PWM_FREQ_BOOST: boost frequency by x4
	// deadBand: set dead-band cycle for PWM 

	// we can set PWM frequency directly
	// usage: pwmFrequency(pin, freq_in_hz)
	// set PWM frequency to 300KHz, return its duty resolution
	dutyMax = pwmFrequency(D5, 300000);

	// usage: pwmWrite(pin, duty)
	// Note: maximum duty is calcuated when set pwm frequency
	pwmWrite(D5, dutyMax >> 2);
	pwmWrite(D6, dutyMax >> 2);

More detail will be documented in comming Wiki page


Larduino HSP is based on optiboot. Source can be found inside bootloader directory

  • Bootloader upload baudrate: 57600bps


  1. Unzip Larduino_HSP_vX.X.rar
  2. Copy [sketches], [hardware] and [libraries] directories to arduino's sketchbook direcotry
  3. Restart Arduino, you will see new board from [Tools]->[Border] menu.

About arduino's sketchbook directory

You can always find this directory from [File]->[Preferences] menu. Here is the default sketchbook directory for most popluar system:

System Path of sketchbook
Windows C:\Users<Username>\Documents\Arduino
Mac OSX /Users/user/Documents/Arduino
LINUX /home/<Username>/sketchbook

Arduino Board based on LGT8F's

Here we list one remarkable arduino board based on LGT8F, which is designed by OCROBOT
ALPHA 8F382P-U stick, with USB to UART on board. You can afford it just of RMB 8.00.

Please follow OCROBOT ALPHA 8F832P-U official page for more details.