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-/* This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- *
- */
-/** SSD1306 OLED library (code)
- * @file oled_ssd1306.c
- * @author King Kévin <kingkevin@cuvoodoo.info>
- * @date 2018
- * @note peripherals used: I2C @ref oled_ssd1306_i2c
- */
-/* standard libraries */
-#include <stdint.h> // standard integer types
-#include <stdbool.h> // boolean type
-#include <stdlib.h> // general utilities
-
-/* STM32 (including CM3) libraries */
-#include <libopencm3/stm32/i2c.h> // I2C library
-
-/* own libraries */
-#include "global.h" // global utilities
-#include "oled_ssd1306.h" // OLED definitions
-#include "i2c_master.h" // I2C header and definitions
-
-/** SSD1306 OLED display I2C slave address */
-#define OLED_SSD1306_SLAVE 0x3c
-
-/** @defgroup oled_ssd1306_i2c I2C peripheral to communicate with the SSD1306 OLED
- * @{
- */
-#define OLED_SSD1306_I2C I2C1 /**< I2C peripheral */
-/** @} */
-
-bool oled_ssd1306_setup(void)
-{
- if (!i2c_master_check_signals(OLED_SSD1306_I2C)) { // check if there are pull-ups to operator I2C
- return false;
- }
- i2c_master_setup(OLED_SSD1306_I2C, 400); // setup I2C bus ( SSD1306 supports an I2C cleck up to 400 kHz)
- const uint8_t oled_init[] = {
- 0x00, // control byte: continuous (multiple byes), command
- 0xae, // Set Display ON/OFF: OFF
- // hardware configuration
- 0xa8, 0x3f, // Set Multiplex Ratio: 64
- 0xd3, 0x00, // Set Display Offset: 0
- 0xa1, // Set Segment Re-map: column address 0 is mapped to SEG127
- 0xc8, // Set COM Output Scan Direction: normal mode (RESET) Scan from COM[N-1] to COM[0]
- 0xda, 0x12, // Set COM Pins Hardware Configuration: Alternative COM pin configuration, Disable COM Left/Right remap
- 0x40, // Set Display Start Line: start line register from 0
- // fundamental commands
- 0x81, 0xff, // Set Contrast Control: 256
- 0xa6, // Set Normal/Inverse Display: Normal display (RESET)
- // Timing & Driving Scheme Setting
- 0xd5, 0xf0, // Set Display Clock Divide Ratio/Oscillator Frequency: Divide ratio=129, F_OSC=1
- 0xd9, 0x22, // Set Pre-charge Period: Phase 1=2 DCLK, Phase 2=2DCLK
- 0xdb, 0x20, // Set V_COMH Deselect Level: ~0.77xV_CC
- // Charge Pump
- 0x8d, 0x14, // Charge Pump Setting: Enable Charge Pump
- // Addressing Setting
- 0x20, 0x00 // Set Memory Addressing Mode: Horizontal Addressing Mode
- }; // command to initialize the display
- return I2C_MASTER_RC_NONE==i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, oled_init, LENGTH(oled_init)); // send command to initialize display
-}
-
-void oled_ssd1306_on(void)
-{
- const uint8_t oled_display_on[] = {
- 0x80, // control byte: no continuation, command
- 0xaf, // Set Display ON/OFF: ON
- }; // command to switch on display
- i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, oled_display_on, LENGTH(oled_display_on)); // sent command to switch on display
-}
-
-void oled_ssd1306_off(void)
-{
- const uint8_t oled_display_off[] = {
- 0x80, // control byte: no continuation, command
- 0xae, // Set Display ON/OFF: OFF
- }; // command to switch off display
- i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, oled_display_off, LENGTH(oled_display_off)); // sent command to switch onff display
-}
-
-void oled_ssd1306_test(void)
-{
- const uint8_t oled_entire_display_on[] = {
- 0x80, // control byte: no continuation, command
- 0xa5 // Entire Display ON: Entire display ON Output ignores RAM content
- }; // command to set entire display on
- i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, oled_entire_display_on, LENGTH(oled_entire_display_on)); // send command to switch entire display on
- oled_ssd1306_on(); // set display on
- sleep_ms(200); // let is on for a bit (enough for the user to see it is completely on
- oled_ssd1306_off(); // set display off
- const uint8_t oled_entire_display_ram[] = {
- 0x80, // control byte: no continuation, command
- 0xa4 // Entire Display ON: Resume to RAM content display
- }; // command to display RAM
- i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, oled_entire_display_ram, LENGTH(oled_entire_display_ram)); // send command to display RAM
-}
-
-void oled_ssd1306_display(const uint8_t* display_data, uint16_t display_length)
-{
- // verify input
- if (0==display_length || NULL==display_data) {
- return;
- }
-
- const uint8_t oled_start_page[] = {
- 0x00, // control byte: continuous (multiple byes), command
- 0xb0, // Set Page Start Address for Page Addressing Mode: PAGE0
- 0x00, // Set Lower Column Start Address for Page Addressing Mode: 0
- 0x10 // Set Higher Column Start Address for Page Addressing Mode: 0
- }; // command to set addressing mode
- i2c_master_slave_write(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, oled_start_page, LENGTH(oled_start_page)); // send command to set addressing mode
- if (I2C_MASTER_RC_NONE!=i2c_master_start(OLED_SSD1306_I2C)) { // send start condition
- return;
- }
- if (I2C_MASTER_RC_NONE!=i2c_master_select_slave(OLED_SSD1306_I2C, OLED_SSD1306_SLAVE, false, true)) { // select OLED display
- return;
- }
- const uint8_t oled_data[] = {
- 0x40, // control byte: continuous (multiple byes), data
- };
- if (I2C_MASTER_RC_NONE!=i2c_master_write(OLED_SSD1306_I2C, oled_data, LENGTH(oled_data))) { // send data header
- return;
- }
- if (I2C_MASTER_RC_NONE!=i2c_master_write(OLED_SSD1306_I2C, display_data, display_length)) { // send template picture to display
- return;
- }
- i2c_master_stop(OLED_SSD1306_I2C); // send stop condition
-}
-