138 lines
3.6 KiB
C
138 lines
3.6 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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#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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int8_t vccstate;
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int32_t row_offset = 0;
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// I2C configuration structure.
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static I2CConfig i2cconfig;
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/**
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* @brief Initialize the board for the display.
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* @notes This board definition uses GPIO and assumes exclusive access to these GPIO pins
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* @notapi
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*/
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static inline void init_board(void) {
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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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i2cconfig.timingr = 0x00100002; // 800kHz Fast Mode+
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i2cInit();
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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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vccstate = SSD1306_SWITCHCAPVCC;
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}
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/**
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* @brief Set or clear the lcd reset pin.
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* @param[in] state TRUE = lcd in reset, FALSE = normal operation
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* @notapi
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*/
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static inline void setpin_reset(bool_t state) {
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if(state)
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SET_RST
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else
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CLR_RST
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}
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/**
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* @brief Set the lcd back-light level.
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* @param[in] percent 0 to 100%
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* @notapi
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*/
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static inline void set_backlight(uint8_t percent) {
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// Since we are on OLED no backlight needed
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}
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/**
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* @brief Take exclusive control of the bus
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* @notapi
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*/
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static inline void acquire_bus(void) {
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i2cAcquireBus(&I2CD1);
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}
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/**
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* @brief Release exclusive control of the bus
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* @notapi
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*/
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static inline void release_bus(void) {
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i2cReleaseBus(&I2CD1);
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}
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/**
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* @brief Send command to the display.
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* @param[in] cmd The command to send *
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* @notapi
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*/
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static inline void write_cmd(uint8_t cmd) {
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uint8_t command[] = { 0x00, // Co = 0, D/C = 0
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cmd },
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txLength = sizeof(command)/sizeof(command[0]),
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rxLength = 0;
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i2cStart(&I2CD1, &i2cconfig);
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i2cMasterTransmitTimeout(&I2CD1, SSD1306_I2C_ADDRESS, command, txLength, NULL, rxLength, MS2ST(10));
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i2cStop(&I2CD1);
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}
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/**
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* @brief Send data to the display.
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* @param[in] data The data to send
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* @notapi
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*/
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static inline void write_data(uint8_t* data, uint16_t length) {
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uint8_t command[length+1],
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txLength = length+1,
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rxLength = 0;
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command[0] = 0x40; // Co = 0, D/C = 1
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memmove(&command[1], data, length);
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i2cStart(&I2CD1, &i2cconfig);
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i2cMasterTransmitTimeout(&I2CD1, SSD1306_I2C_ADDRESS, command, txLength, NULL, rxLength, 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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/** @} */
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