mirror of https://github.com/ArduPilot/ardupilot
107 lines
3.1 KiB
C++
107 lines
3.1 KiB
C++
/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
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/*
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "Display_SSD1306_I2C.h"
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#include <AP_HAL/AP_HAL.h>
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static const AP_HAL::HAL& hal = AP_HAL::get_HAL();
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bool Display_SSD1306_I2C::hw_init()
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{
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// display init sequence
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uint8_t init_seq[] = {0xAE, 0xD5, 0x80, 0xA8, 0x3F, 0xD3,
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0x00, 0x40, 0x8D, 0x14, 0x20, 0x00,
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0xA1, 0xC8, 0xDA, 0x12, 0x81, 0xCF,
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0xD9, 0xF1, 0xDB, 0x40, 0xA4, 0xA6,
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0xAF, 0x21, 0, 127, 0x22, 0, 7
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};
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// get pointer to i2c bus semaphore
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AP_HAL::Semaphore* i2c_sem = hal.i2c->get_semaphore();
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// take i2c bus sempahore
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if (!i2c_sem->take(HAL_SEMAPHORE_BLOCK_FOREVER)) {
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return false;
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}
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// disable recording of i2c lockup errors
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hal.i2c->ignore_errors(true);
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// init display
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hal.i2c->writeRegisters(SSD1306_I2C_ADDRESS, 0x0, sizeof(init_seq), init_seq);
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// re-enable recording of i2c lockup errors
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hal.i2c->ignore_errors(false);
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// give back i2c semaphore
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i2c_sem->give();
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// clear display
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hw_update();
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return true;
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}
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bool Display_SSD1306_I2C::hw_update()
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{
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uint8_t command[] = {0x21, 0, 127, 0x22, 0, 7};
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// get pointer to i2c bus semaphore
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AP_HAL::Semaphore* i2c_sem = hal.i2c->get_semaphore();
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// exit immediately if we can't take the semaphore
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if (i2c_sem == NULL || !i2c_sem->take(5)) {
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return false;
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}
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// write buffer to display
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for (uint8_t i = 0; i < (SSD1306_COLUMNS / SSD1306_COLUMNS_PER_PAGE); i++) {
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command[4] = i;
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hal.i2c->writeRegisters(SSD1306_I2C_ADDRESS, 0x0, sizeof(command), command);
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hal.i2c->writeRegisters(SSD1306_I2C_ADDRESS, 0x40, SSD1306_ROWS, &_displaybuffer[i * SSD1306_ROWS]);
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}
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// give back i2c semaphore
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i2c_sem->give();
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return true;
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}
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bool Display_SSD1306_I2C::set_pixel(uint16_t x, uint16_t y)
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{
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// check x, y range
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if ((x >= SSD1306_ROWS) || (y >= SSD1306_COLUMNS)) {
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return false;
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}
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// set pixel in buffer
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_displaybuffer[x + (y / 8 * SSD1306_ROWS)] |= 1 << (y % 8);
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return true;
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}
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bool Display_SSD1306_I2C::clear_pixel(uint16_t x, uint16_t y)
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{
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// check x, y range
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if ((x >= SSD1306_ROWS) || (y >= SSD1306_COLUMNS)) {
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return false;
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}
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// clear pixel in buffer
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_displaybuffer[x + (y / 8 * SSD1306_ROWS)] &= ~(1 << (y % 8));
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return true;
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}
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