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/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://ugfx.io/license.html
*/
/**
* @file boards/addons/gdisp/board_SSD1306_i2c.h
* @brief GDISP Graphic Driver subsystem board interface for the SSD1306 display.
*
* @note This file contains a mix of hardware specific and operating system specific
* code. You will need to change it for your CPU and/or operating system.
*/
#ifndef _GDISP_LLD_BOARD_H
#define _GDISP_LLD_BOARD_H
// The command byte to put on the front of each page line
#define SSD1306_PAGE_PREFIX 0x40 // Co = 0, D/C = 1
// For a multiple display configuration we would put all this in a structure and then
// set g->board to that structure.
#define SSD1306_RESET_PORT GPIOB
#define SSD1306_RESET_PIN 5
/**
* The default slave address is 0x3D, (talking about
* only the real address part here) and the slave
* address can be changed to 0x3C by soldering the
* SA0 pads on the bottom side of the module.
*
* b7 | b6 | b5 | b4 | b3 | b2 | b1 | b0
* --------------------------------------
* 0 | 1 | 1 | 1 | 1 | 0 |SA0 | R/W
*/
#define SSD1306_I2C_ADDRESS 0x3D
#define SSD1306_SDA_PORT GPIOB
#define SSD1306_SDA_PIN 7
#define SSD1306_SCL_PORT GPIOB
#define SSD1306_SCL_PIN 6
#define SET_RST palSetPad(SSD1306_RESET_PORT, SSD1306_RESET_PIN);
#define CLR_RST palClearPad(SSD1306_RESET_PORT, SSD1306_RESET_PIN);
// I2C configuration structure.
static I2CConfig i2cconfig;
#if GFX_USE_OS_CHIBIOS
static int32_t thdPriority = 0;
#endif
static GFXINLINE void init_board(GDisplay *g) {
// As we are not using multiple displays we set g->board to NULL as we don't use it.
g->board = 0;
switch(g->controllerdisplay) {
case 0: // Set up for Display 0
// RESET pin.
palSetPadMode(SSD1306_RESET_PORT, SSD1306_RESET_PIN, PAL_MODE_OUTPUT_PUSHPULL);
/*
* Initializes the I2C driver 1. The I2C1 signals are routed as follows:
* PB6 - SCL.
* PB7 - SDA.
* Timing value comes from ST I2C config tool (xls):
* 0x00901D2B; // 100kHz Standard Mode
* 0x00300444; // 100kHz Fast Mode
* 0x0030020A; // 400kHz Fast Mode
* 0x00100002; // 800kHz Fast Mode +
*/
palSetPadMode(SSD1306_SCL_PORT, SSD1306_SCL_PIN, PAL_MODE_ALTERNATE(1));
palSetPadMode(SSD1306_SDA_PORT, SSD1306_SDA_PIN, PAL_MODE_ALTERNATE(1));
i2cconfig.timingr = 0x00100002; // 800kHz Fast Mode+
i2cInit();
break;
}
}
static GFXINLINE void post_init_board(GDisplay *g) {
(void) g;
}
static GFXINLINE void setpin_reset(GDisplay *g, gBool state) {
(void) g;
if(state)
CLR_RST
else
SET_RST
}
static GFXINLINE void acquire_bus(GDisplay *g) {
(void) g;
#if GFX_USE_OS_CHIBIOS
thdPriority = (int32_t)chThdGetPriority();
chThdSetPriority(HIGHPRIO);
#endif
i2cAcquireBus(&I2CD1);
}
static GFXINLINE void release_bus(GDisplay *g) {
(void) g;
#if GFX_USE_OS_CHIBIOS
chThdSetPriority(thdPriority);
#endif
i2cReleaseBus(&I2CD1);
}
static GFXINLINE void write_cmd(GDisplay *g, uint8_t cmd) {
uint8_t command[2];
(void) g;
command[0] = 0x00; // Co = 0, D/C = 0
command[1] = cmd;
i2cStart(&I2CD1, &i2cconfig);
i2cMasterTransmitTimeout(&I2CD1, SSD1306_I2C_ADDRESS, command, 2, 0, 0, MS2ST(10));
i2cStop(&I2CD1);
}
static GFXINLINE void write_data(GDisplay *g, uint8_t* data, uint16_t length) {
(void) g;
i2cStart(&I2CD1, &i2cconfig);
i2cMasterTransmitTimeout(&I2CD1, SSD1306_I2C_ADDRESS, data, length, 0, 0, MS2ST(10));
i2cStop(&I2CD1);
}
#endif /* _GDISP_LLD_BOARD_H */
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