Karl Zweimüller / UniGraphic

UniGraphic-Fork for ST7920-LCD-controller and SH1106. Tested with 128x64 LCD with SPI and 128x64-OLED with IIC

Dependents:   UniGraphic-St7920-Test AfficheurUTILECO

Fork of UniGraphic by GraphicsDisplay

Fork of the UniGraphic-Library for monochrome LCDs with ST7920 controller and 128x64-IIC-OLED-Display with SH1106-Controller

/media/uploads/charly/20170522_210344.jpg

/media/uploads/charly/20180425_230623.jpg

Had to adapt LCD for following reasons:

  • Give access to screenbuffer buffer[] to parent class
  • pixel() and pixel_read() as they are hardware-dependent
  • added reset-pin to IIC-Interface

GraphicDisplay:: sends buffer to LCD when auto_update is set to true.

Testprogram for ST7920 can be found here:

https://developer.mbed.org/users/charly/code/UniGraphic-St7920-Test/

Protocols/I2C_bus.h@38:1b6f9fc49a03, 2018-10-30 (annotated)

Committer:
charly
Date:
Tue Oct 30 20:00:29 2018 +0000
Revision:
38:1b6f9fc49a03
Parent:
36:668396f861d2 
some modifications.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
dreschpe 33:f87f06292637 1 #ifndef I2C_bus_H
dreschpe 33:f87f06292637 2 #define I2C_bus_H
dreschpe 33:f87f06292637 3
dreschpe 33:f87f06292637 4 #include "mbed.h"
dreschpe 33:f87f06292637 5 #include "Protocols.h"
dreschpe 33:f87f06292637 6
dreschpe 33:f87f06292637 7 /** I2C interface
dreschpe 33:f87f06292637 8 */
dreschpe 33:f87f06292637 9 class I2C_bus : public Protocols
dreschpe 33:f87f06292637 10 {
dreschpe 33:f87f06292637 11 public:
dreschpe 33:f87f06292637 12
dreschpe 33:f87f06292637 13 /** Create an I2C display interface
dreschpe 33:f87f06292637 14 *
dreschpe 33:f87f06292637 15 * @param I2C frquency
dreschpe 33:f87f06292637 16 * @param I2C address
dreschpe 33:f87f06292637 17 * @param I2C pin sda
dreschpe 33:f87f06292637 18 * @param I2C pin scl
charly 36:668396f861d2 19 * @param reset pin connected to RESET of display
dreschpe 33:f87f06292637 20 */
charly 36:668396f861d2 21 I2C_bus(int Hz, int address,PinName sda, PinName scl, PinName reset=NC);
dreschpe 33:f87f06292637 22
dreschpe 33:f87f06292637 23 protected:
dreschpe 33:f87f06292637 24
dreschpe 33:f87f06292637 25 /** Send 8bit command to display controller
dreschpe 33:f87f06292637 26 *
dreschpe 33:f87f06292637 27 * @param cmd: byte to send
dreschpe 33:f87f06292637 28 *
dreschpe 33:f87f06292637 29 */
dreschpe 33:f87f06292637 30 virtual void wr_cmd8(unsigned char cmd);
dreschpe 33:f87f06292637 31
dreschpe 33:f87f06292637 32 /** Send 8bit data to display controller
dreschpe 33:f87f06292637 33 *
dreschpe 33:f87f06292637 34 * @param data: byte to send
dreschpe 33:f87f06292637 35 *
dreschpe 33:f87f06292637 36 */
dreschpe 33:f87f06292637 37 virtual void wr_data8(unsigned char data);
dreschpe 33:f87f06292637 38
dreschpe 33:f87f06292637 39 /** Send 2x8bit command to display controller
dreschpe 33:f87f06292637 40 *
dreschpe 33:f87f06292637 41 * @param cmd: halfword to send
dreschpe 33:f87f06292637 42 * @note in SPI_16 mode a single 16bit transfer will be done
dreschpe 33:f87f06292637 43 */
dreschpe 33:f87f06292637 44 virtual void wr_cmd16(unsigned short cmd);
dreschpe 33:f87f06292637 45
dreschpe 33:f87f06292637 46 /** Send 2x8bit data to display controller
dreschpe 33:f87f06292637 47 *
dreschpe 33:f87f06292637 48 * @param data: halfword to send
dreschpe 33:f87f06292637 49 * @note in SPI_16 mode a single 16bit transfer will be done
dreschpe 33:f87f06292637 50 */
dreschpe 33:f87f06292637 51 virtual void wr_data16(unsigned short data);
dreschpe 33:f87f06292637 52
dreschpe 33:f87f06292637 53 /** Send 16bit pixeldata to display controller
dreschpe 33:f87f06292637 54 *
dreschpe 33:f87f06292637 55 * @param data: halfword to send
dreschpe 33:f87f06292637 56 *
dreschpe 33:f87f06292637 57 */
dreschpe 33:f87f06292637 58 virtual void wr_gram(unsigned short data);
dreschpe 33:f87f06292637 59
dreschpe 33:f87f06292637 60 /** Send same 16bit pixeldata to display controller multiple times
dreschpe 33:f87f06292637 61 *
dreschpe 33:f87f06292637 62 * @param data: halfword to send
dreschpe 33:f87f06292637 63 * @param count: how many
dreschpe 33:f87f06292637 64 *
dreschpe 33:f87f06292637 65 */
dreschpe 33:f87f06292637 66 virtual void wr_gram(unsigned short data, unsigned int count);
dreschpe 33:f87f06292637 67
dreschpe 33:f87f06292637 68 /** Send array of pixeldata shorts to display controller
dreschpe 33:f87f06292637 69 *
dreschpe 33:f87f06292637 70 * @param data: unsigned short pixeldata array
dreschpe 33:f87f06292637 71 * @param lenght: lenght (in shorts)
dreschpe 33:f87f06292637 72 *
dreschpe 33:f87f06292637 73 */
dreschpe 33:f87f06292637 74 virtual void wr_grambuf(unsigned short* data, unsigned int lenght);
dreschpe 33:f87f06292637 75
dreschpe 33:f87f06292637 76 /** Read 16bit pixeldata from display controller (with dummy cycle)
dreschpe 33:f87f06292637 77 *
dreschpe 33:f87f06292637 78 * @param convert true/false. Convert 18bit to 16bit, some controllers returns 18bit
dreschpe 33:f87f06292637 79 * @returns 16bit color
dreschpe 33:f87f06292637 80 */
dreschpe 33:f87f06292637 81 virtual unsigned short rd_gram(bool convert);
dreschpe 33:f87f06292637 82
dreschpe 33:f87f06292637 83 /** Read 4x8bit register data (
dreschpe 33:f87f06292637 84 * reading from display ia I2C is not implemented in most controllers !
dreschpe 33:f87f06292637 85 *
dreschpe 33:f87f06292637 86 */
dreschpe 33:f87f06292637 87 virtual unsigned int rd_reg_data32(unsigned char reg);
dreschpe 33:f87f06292637 88
dreschpe 33:f87f06292637 89 /** Read 3x8bit ExtendedCommands register data
dreschpe 33:f87f06292637 90 * reading from display ia I2C is not implemented in most controllers !
dreschpe 33:f87f06292637 91 */
dreschpe 33:f87f06292637 92 virtual unsigned int rd_extcreg_data32(unsigned char reg, unsigned char SPIreadenablecmd);
dreschpe 33:f87f06292637 93
dreschpe 33:f87f06292637 94 /** ILI932x specific, does a dummy read cycle, number of bits is protocol dependent
dreschpe 33:f87f06292637 95 * reading from display ia I2C is not implemented in most controllers !
dreschpe 33:f87f06292637 96 */
dreschpe 33:f87f06292637 97 virtual void dummyread ();
dreschpe 33:f87f06292637 98
dreschpe 33:f87f06292637 99 /** ILI932x specific, select register for a successive write or read
dreschpe 33:f87f06292637 100 *
dreschpe 33:f87f06292637 101 * reading from display ia I2C is not implemented in most controllers !
dreschpe 33:f87f06292637 102 */
dreschpe 33:f87f06292637 103 virtual void reg_select(unsigned char reg, bool forread =false);
dreschpe 33:f87f06292637 104
dreschpe 33:f87f06292637 105 /** ILI932x specific, write register with data
dreschpe 33:f87f06292637 106 *
dreschpe 33:f87f06292637 107 * @param reg register to write
dreschpe 33:f87f06292637 108 * @param data 16bit data
dreschpe 33:f87f06292637 109 * not implemented for I2C !
dreschpe 33:f87f06292637 110 */
dreschpe 33:f87f06292637 111 virtual void reg_write(unsigned char reg, unsigned short data);
dreschpe 33:f87f06292637 112
dreschpe 33:f87f06292637 113 /** ILI932x specific, read register
dreschpe 33:f87f06292637 114 *
dreschpe 33:f87f06292637 115 * @param reg register to be read
dreschpe 33:f87f06292637 116 * @returns 16bit register value
dreschpe 33:f87f06292637 117 * not implemented for I2C !
dreschpe 33:f87f06292637 118 */
dreschpe 33:f87f06292637 119 virtual unsigned short reg_read(unsigned char reg);
dreschpe 33:f87f06292637 120
dreschpe 33:f87f06292637 121 /** HW reset sequence (without display init commands)
dreschpe 33:f87f06292637 122 * most I2C displays have no reset signal !
dreschpe 33:f87f06292637 123 */
dreschpe 33:f87f06292637 124 virtual void hw_reset();
dreschpe 33:f87f06292637 125
dreschpe 33:f87f06292637 126 /** Set ChipSelect high or low
dreschpe 33:f87f06292637 127 * @param enable 0/1
dreschpe 33:f87f06292637 128 * not implemented for I2C !
dreschpe 33:f87f06292637 129 */
dreschpe 33:f87f06292637 130 virtual void BusEnable(bool enable);
dreschpe 33:f87f06292637 131
dreschpe 33:f87f06292637 132 private:
dreschpe 33:f87f06292637 133
dreschpe 33:f87f06292637 134 I2C _i2c;
dreschpe 33:f87f06292637 135 int _address;
charly 36:668396f861d2 136 DigitalOut _reset;
dreschpe 33:f87f06292637 137
dreschpe 33:f87f06292637 138 };
dreschpe 33:f87f06292637 139
dreschpe 33:f87f06292637 140
dreschpe 33:f87f06292637 141 #endif