Yang Junyao 201090191
Diff: N5110.cpp
- Revision:
- 21:4cbdc20fea9f
- Parent:
- 20:8db6aa25f55e
- Child:
- 22:31c54fc61f12
--- a/N5110.cpp Thu Jan 19 19:42:34 2017 +0000 +++ b/N5110.cpp Sat Jan 28 20:25:43 2017 +0000 @@ -7,10 +7,11 @@ #include "mbed.h" #include "N5110.h" - +// overloaded constructor includes power pin - LCD Vcc connected to GPIO pin +// this constructor works fine with LPC1768 - enough current sourced from GPIO +// to power LCD. Doesn't work well with K64F. N5110::N5110(PinName pwrPin, PinName scePin, PinName rstPin, PinName dcPin, PinName mosiPin, PinName sclkPin, PinName ledPin) { - spi = new SPI(mosiPin,NC,sclkPin); // create new SPI instance and initialise initSPI(); @@ -23,6 +24,22 @@ } +// overloaded constructor does not include power pin - LCD Vcc must be tied to +3V3 +// Best to use this with K64F as the GPIO hasn't sufficient output current to reliably +// drive the LCD. +N5110::N5110(PinName scePin, PinName rstPin, PinName dcPin, PinName mosiPin, PinName sclkPin, PinName ledPin) +{ + spi = new SPI(mosiPin,NC,sclkPin); // create new SPI instance and initialise + initSPI(); + + // set up pins as required + led = new PwmOut(ledPin); + sce = new DigitalOut(scePin); + rst = new DigitalOut(rstPin); + dc = new DigitalOut(dcPin); + +} + // initialise function - powers up and sends the initialisation commands void N5110::init() { @@ -66,7 +83,12 @@ { // set brightness of LED - 0.0 to 1.0 - default is 50% setBrightness(0.5); - pwr->write(1); // apply power + + // if we are powering the LCD using the GPIO then make it high to turn on + // DigitalOut pointer won't be NULL if we used the constructor with power pin + if (pwr != NULL) { + pwr->write(1); // apply power + } } // function to power down LCD @@ -82,7 +104,12 @@ sendCommand(0x20 | CMD_FS_POWER_DOWN_MODE | CMD_FS_HORIZONTAL_MODE | CMD_FS_EXTENDED_MODE); // small delay and then turn off the power pin wait_ms(10); - pwr->write(0); + + // if we are powering the LCD using the GPIO then make it low to turn off + // DigitalOut pointer won't be NULL if we used the constructor with power pin + if (pwr != NULL) { + pwr->write(0); // turn off power + } } @@ -291,7 +318,7 @@ // elements are normalised from 0.0 to 1.0, so multiply // by 47 to convert to pixel range, and subtract from 47 // since top-left is 0,0 in the display geometry - setPixel(i,47 - int(array[i]*47.0)); + setPixel(i,47 - int(array[i]*47.0f)); } refresh();