Arduino Hardware Support Package for LGT8F's

Task status

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

Summary

Larduino_HSP is a 3rd party hardware support package for the LGT8F core based arduino boards. The backend of the HSP is 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 3rd 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
    fastioToggle(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 
    pwmMode(D5, PWM_MODE_SOLO, PWM_FREQ_FAST);

    // 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 
    pwmMode(D5, PWM_MODE_DUO1, PWM_FREQ_FAST|PWM_FREQ_BOOST, deadBand);

    // 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 coming Wiki page

Bootloader

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

• Bootloader upload baudrate: 57600bps

Installation:

1. Unzip master.zip
2. Copy the [hardware] directory to Arduino's sketchbook directory (see below to find out where it normally resides)
3. Restart Arduino, you will see new board from [Tools]->[Board] menu.

About arduino's sketchbook directory

You can always find this directory via the [File]->[Preferences] dialog. But here is the default sketchbook directory for most popluar system:

Arduino Board based on LGT8F's

Here we list one remarkable arduino board based on the LGT8F, which is designed by OCROBOT, the ALPHA 8F382P-U stick with USB to UART on-board. Very affordable, for a low cost of just RMB 8.00!

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