133 lines
3.5 KiB
C
133 lines
3.5 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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/**
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* @file boards/addons/gdisp/board_SSD1306_i2c.h
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* @brief GDISP Graphic Driver subsystem board interface for the SSD1306 display.
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*
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* @note This file contains a mix of hardware specific and operating system specific
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* code. You will need to change it for your CPU and/or operating system.
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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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// The command byte to put on the front of each page line
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#define SSD1306_PAGE_PREFIX 0x40 // Co = 0, D/C = 1
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// For a multiple display configuration we would put all this in a structure and then
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// set g->board to that structure.
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#define SSD1306_RESET_PORT GPIOB
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#define SSD1306_RESET_PIN 5
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/**
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* The default slave address is 0x3D, (talking about
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* only the real address part here) and the slave
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* address can be changed to 0x3C by soldering the
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* SA0 pads on the bottom side of the module.
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*
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* b7 | b6 | b5 | b4 | b3 | b2 | b1 | b0
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* --------------------------------------
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* 0 | 1 | 1 | 1 | 1 | 0 |SA0 | R/W
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*/
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#define SSD1306_I2C_ADDRESS 0x3D
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#define SSD1306_SDA_PORT GPIOB
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#define SSD1306_SDA_PIN 7
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#define SSD1306_SCL_PORT GPIOB
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#define SSD1306_SCL_PIN 6
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#define SET_RST palSetPad(SSD1306_RESET_PORT, SSD1306_RESET_PIN);
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#define CLR_RST palClearPad(SSD1306_RESET_PORT, SSD1306_RESET_PIN);
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// I2C configuration structure.
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static I2CConfig i2cconfig;
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#if GFX_USE_OS_CHIBIOS
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static int32_t thdPriority = 0;
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#endif
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static GFXINLINE void init_board(GDisplay *g) {
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// As we are not using multiple displays we set g->board to NULL as we don't use it.
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g->board = 0;
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switch(g->controllerdisplay) {
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case 0: // Set up for Display 0
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// RESET pin.
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palSetPadMode(SSD1306_RESET_PORT, SSD1306_RESET_PIN, PAL_MODE_OUTPUT_PUSHPULL);
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/*
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* Initializes the I2C driver 1. The I2C1 signals are routed as follows:
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* PB6 - SCL.
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* PB7 - SDA.
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* Timing value comes from ST I2C config tool (xls):
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* 0x00901D2B; // 100kHz Standard Mode
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* 0x00300444; // 100kHz Fast Mode
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* 0x0030020A; // 400kHz Fast Mode
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* 0x00100002; // 800kHz Fast Mode +
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*/
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palSetPadMode(SSD1306_SCL_PORT, SSD1306_SCL_PIN, PAL_MODE_ALTERNATE(1));
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palSetPadMode(SSD1306_SDA_PORT, SSD1306_SDA_PIN, PAL_MODE_ALTERNATE(1));
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i2cconfig.timingr = 0x00100002; // 800kHz Fast Mode+
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i2cInit();
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break;
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}
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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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if(state)
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CLR_RST
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else
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SET_RST
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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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#if GFX_USE_OS_CHIBIOS
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thdPriority = (int32_t)chThdGetPriority();
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chThdSetPriority(HIGHPRIO);
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#endif
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i2cAcquireBus(&I2CD1);
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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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#if GFX_USE_OS_CHIBIOS
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chThdSetPriority(thdPriority);
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#endif
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i2cReleaseBus(&I2CD1);
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}
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static GFXINLINE void write_cmd(GDisplay *g, uint8_t cmd) {
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uint8_t command[2];
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(void) g;
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command[0] = 0x00; // Co = 0, D/C = 0
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command[1] = cmd;
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i2cStart(&I2CD1, &i2cconfig);
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i2cMasterTransmitTimeout(&I2CD1, SSD1306_I2C_ADDRESS, command, 2, 0, 0, MS2ST(10));
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i2cStop(&I2CD1);
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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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i2cStart(&I2CD1, &i2cconfig);
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i2cMasterTransmitTimeout(&I2CD1, SSD1306_I2C_ADDRESS, data, length, 0, 0, MS2ST(10));
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i2cStop(&I2CD1);
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}
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#endif /* _GDISP_LLD_BOARD_H */
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