147 lines
3.7 KiB
C
147 lines
3.7 KiB
C
/*
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* This file is subject to the terms of the GFX License. If a copy of
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* the license was not distributed with this file, you can obtain one at:
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*
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* http://ugfx.org/license.html
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*/
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#ifndef _GDISP_LLD_BOARD_H
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#define _GDISP_LLD_BOARD_H
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#include "board_uext.h"
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/*
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* NOTE: This board file is for an SSD1306 running in I2C mode
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* You will need to use a different board file for an SSD1306 running in SPI mode
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*/
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#define I2C_ADDRESS (0x78/2) // SSD1306 supports either 0x78 or 0x7A (including the write bit)
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#define I2C_RATE 400000 // 400kHz is I2C FAST mode
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// The various methods of driving the I2C interface
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#define I2C_METHOD_CHIBIOS 3
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// The various supported CPU's
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#define CPU_AT91 1
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// What methods are we using in this file
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#define I2C_METHOD I2C_METHOD_CHIBIOS
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#define CPU_METHOD CPU_AT91
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// If using SPI_METHOD_CHIBIOS the CPU specific i2cconfig structure must be defined for your CPU
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#if CPU_METHOD == CPU_AT91
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#define I2C_CONFIG_REGISTER ((((MCK/I2C_RATE/2 - 3)>>8)<<16)|(((MCK/I2C_RATE/2 - 3)&0xFF)<<8)|(((MCK/I2C_RATE/2 - 3)&0xFF)<<0)) // For AT91SAM7: 8bit, CPOL=1, NCPHA = 0, ClockPhase=0, SCLK = 48Mhz/8 = 6MHz
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#if I2C_METHOD == I2C_METHOD_CHIBIOS
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// ChibiOS - Yuck! This structure is different on each platform.
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// This is the one for the AT91
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static const I2CConfig i2cconfig = {
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I2C_CONFIG_REGISTER
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};
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#endif
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#else
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#error "SSD1306: Unsupported CPU"
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#endif
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//---------------------------------------------------------------------
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/*
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* Pin connection for the display to the UEXT connector:
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*
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* DISPLAY VCC UEXT PIN 1 (3.3V)
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* DISPLAY GND UEXT PIN 2 (GND)
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* DISPLAY SCL UEXT PIN 5 (SCL)
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* DISPLAY SDA UEXT PIN 6 (SDA)
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*/
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#if I2C_METHOD == I2C_METHOD_CHIBIOS
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/* ChibiOS can't send a separate data prefix byte in the same transaction as the real data.
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* Nor does it support an address prefix to the data (such as an EEPROM would use).
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* Instead we tell the driver to put it into the RAM buffer at the beginning of each page (Yuck!).
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*
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* Prefix bytes:
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* 0x40 means all following bytes in this transaction go into the GDRAM.
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* 0x00 means the following byte (singular) is a command byte.
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*/
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#define SSD1306_PAGE_PREFIX 0x40
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#define I2C_INIT()
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#define I2C_GETBUS() { \
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i2cAcquireBus(UEXT_I2C); \
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i2cStart(UEXT_I2C, &i2cconfig); \
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}
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#define I2C_RELEASEBUS() { \
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i2cStop(UEXT_I2C); \
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i2cReleaseBus(UEXT_I2C); \
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}
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#define I2C_WAITCOMPLETE()
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#define I2C_WRITECMDBYTE(cmd) { \
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uint8_t data[2]; \
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data[0] = 0; \
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data[1] = cmd; \
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i2cMasterTransmitTimeout (UEXT_I2C, I2C_ADDRESS, data, 2, 0, 0, TIME_INFINITE); \
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}
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#define I2C_WRITEBYTES(pdata, len) i2cMasterTransmitTimeout (UEXT_I2C, I2C_ADDRESS, pdata, length, 0, 0, TIME_INFINITE)
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#else
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#error "SSD1306 board file: Unsupported I2C method"
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#endif
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static GFXINLINE void init_board(GDisplay *g) {
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(void) g;
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I2C_INIT();
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}
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static GFXINLINE void post_init_board(GDisplay *g) {
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(void) g;
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}
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static GFXINLINE void setpin_reset(GDisplay *g, gBool state) {
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(void) g;
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(void) state;
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}
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static GFXINLINE void set_backlight(GDisplay *g, uint8_t percent) {
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(void) g;
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(void) percent;
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}
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static GFXINLINE void acquire_bus(GDisplay *g) {
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(void) g;
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I2C_GETBUS();
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}
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static GFXINLINE void release_bus(GDisplay *g) {
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(void) g;
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I2C_WAITCOMPLETE();
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I2C_RELEASEBUS();
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}
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static GFXINLINE void write_cmd(GDisplay *g, uint8_t cmd) {
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(void) g;
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I2C_WAITCOMPLETE();
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// Command mode please
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I2C_WRITECMDBYTE(cmd);
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}
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static GFXINLINE void write_data(GDisplay *g, uint8_t* data, uint16_t length) {
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(void) g;
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I2C_WAITCOMPLETE();
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// Data mode please
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I2C_WRITEBYTES(data, length);
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}
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#endif /* _GDISP_LLD_BOARD_H */
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