This allows for easier draw loops by either shifting the data byte to the right and checking the lowest bit in a loop or by using the for loop variable as a bit index as shown below. The lowest bit of the data byte is the first pixel to draw. If the bit is set, the corresponding pixel shall be drawn. The second function takes three uint8_t values as a parameter and is called when one byte of data shall be drawn on the display, e.g.: void drawByte(uint8_t x, uint8_t y, uint8_t d)Įach bit in the data byte to draw represents one pixel of the ST7920. The first function has no argument and is called when the display area of the ST7920 shall be cleared, e.g.: void clearDisplay(void) The constructor of the emulator takes two functions as a parameter.
#St7920 code example serial#
This library has no external dependencies as both data I/O of the serial data and the controlling of an external display is done by external code. } GD_RAM // (0,0) corresponds to upper lefthand corner.The ST7920Emulator is a platform independent emulator library that parses ST7920 serial data and draws the calculated display contents using user a supplied function. Declare it first before this driver.ĭots pix // Max dimensions for display (x,y) = (128,32) glcd_plot_image(width,height,X coor, Y coor, inverse)
#St7920 code example drivers#
-WORKS WITH GRAPHIC.C from CCS Drivers Does anybody know where I can find some working example code in C. glcd_pixel(x coordinate, y coordinate, ON or OFF) Hi there I'm having some issues connecting a dsPIC33F chip as a master to a dsPIC33F chip as a slave device with the I2C module. you can use glcd_data() for writing text glcd_init_basic() initilize for accessing the stored Characters glcd_init_graph() initialize for graphing mode glcd_update() -must be called always after writing a pixel or using functions See also ShrimpingIt's bitfont project for pixel typography logic which can be used with micropython-st7920 and other bit-rendering environments. glcd_data( data ) - data can be an array of characters! .and the example will automatically run on boot.
#St7920 code example driver#
The following are the functions included in this driver file Dont for get to change the Busy pin lcd_check_busy data is sent using port B so change output_b() to other ports you PSB is tied to Vcc for this driver because this driver uses Parallel #define XVAL 16 // 16 X 16 or 256 for there is 8 word values for the upper and lower change the pin assignment depending on your circuit * suggestions and request please email me at *
* requirements, if you want i can change it to 4 bit operation. * This driver is using 8bit parallel operation for optimal RAM * * Pin 15 -> PSB (parallel=high & serial=low) * * LCD graphics driver for Digole 12864w with ST7920 driver using *
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