circuitpython/nrf5/drivers/display/oled_ssd1306_driver.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2017 Glenn Ruben Bakke
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdbool.h>
#include "py/mphal.h"
#include "oled_ssd1306_driver.h"
#include "hal_spi.h"
#include "hal_time.h"
#if MICROPY_PY_DISPLAY_OLED_SSD1306
static pin_obj_t * mp_cs_pin;
static pin_obj_t * mp_dc_pin;
static pin_obj_t * mp_reset_pin;
static NRF_SPI_Type * mp_instance;
static void raw_write(uint8_t value)
{
hal_spi_master_tx_rx(mp_instance, 1, &value, NULL);
}
static void cmd_write(uint8_t value)
{
mp_hal_pin_low(mp_dc_pin);
mp_hal_pin_low(mp_cs_pin);
hal_spi_master_tx_rx(mp_instance, 1, &value, NULL);
mp_hal_pin_high(mp_cs_pin);
}
#define SET_CONTRAST (0x81)
#define SET_ENTIRE_ON (0xa4)
#define SET_NORM_INV (0xa6)
#define SET_DISP (0xae)
#define SET_MEM_ADDR (0x20)
#define SET_COL_ADDR (0x21)
#define SET_PAGE_ADDR (0x22)
#define SET_DISP_START_LINE (0x40)
#define SET_SEG_REMAP (0xa0)
#define SET_MUX_RATIO (0xa8)
#define SET_COM_OUT_DIR (0xc0)
#define SET_DISP_OFFSET (0xd3)
#define SET_COM_PIN_CFG (0xda)
#define SET_DISP_CLK_DIV (0xd5)
#define SET_PRECHARGE (0xd9)
#define SET_VCOM_DESEL (0xdb)
#define SET_CHARGE_PUMP (0x8d)
void driver_ssd1306_init(NRF_SPI_Type * p_instance, pin_obj_t * p_cs_pin, pin_obj_t * p_dc_pin, pin_obj_t * p_reset_pin)
{
mp_instance = p_instance;
mp_cs_pin = p_cs_pin;
mp_dc_pin = p_dc_pin;
mp_reset_pin = p_reset_pin;
mp_hal_pin_high(mp_cs_pin);
mp_hal_pin_high(mp_dc_pin);
mp_hal_pin_high(mp_reset_pin);
// power on display
mp_hal_pin_high(mp_reset_pin);
mp_hal_delay_ms(1);
mp_hal_pin_low(mp_reset_pin);
mp_hal_delay_ms(10);
mp_hal_pin_high(mp_reset_pin);
// Turn off
cmd_write(SET_DISP | 0x00); // off
// address setting
cmd_write(SET_MEM_ADDR);
cmd_write(0x00); // horizontal
// resolution and layout
cmd_write(SET_DISP_START_LINE | 0x00);
cmd_write(SET_SEG_REMAP | 0x01); // column addr 127 mapped to SEG0
cmd_write(SET_MUX_RATIO);
uint16_t height = 64; // TODO: configurable
cmd_write(height - 1); // height - 1
cmd_write(SET_COM_OUT_DIR | 0x08); // scan from COM[N] to COM0
cmd_write(SET_DISP_OFFSET);
cmd_write(0x00);
cmd_write(SET_COM_PIN_CFG);
if (height == 32) {
cmd_write(0x02);
} else {
cmd_write(0x12);
}
// timing and driving scheme
cmd_write(SET_DISP_CLK_DIV);
cmd_write(0x80);
cmd_write(SET_PRECHARGE);
bool external_vcc = false;
if (external_vcc == true) {
cmd_write(0x22);
} else {
cmd_write(0xf1);
}
cmd_write(SET_VCOM_DESEL);
cmd_write(0x30); // 0.83*Vcc
// display
cmd_write(SET_CONTRAST);
cmd_write(0xff); // maximum
cmd_write(SET_ENTIRE_ON); // output follows RAM contents
cmd_write(SET_NORM_INV); // not inverted
// charge pump
cmd_write(SET_CHARGE_PUMP);
if (external_vcc == true) {
cmd_write(0x10);
} else {
cmd_write(0x14);
}
// on
cmd_write(SET_DISP | 0x01);
}
static void set_col(uint16_t start_col, uint16_t end_col)
{
cmd_write(SET_COL_ADDR); /* Column Command address */
cmd_write(start_col & 0xFF );
cmd_write(end_col & 0xFF);
}
static void set_page(uint16_t start_page, uint16_t end_page)
{
cmd_write(SET_PAGE_ADDR); /* Column Command address */
cmd_write(start_page & 0xFF);
cmd_write(end_page & 0xFF);
}
void driver_ssd1306_clear(uint16_t color)
{
uint16_t width = 128;
uint16_t height = 64;
uint16_t x0 = 0;
uint16_t x1 = width - 1;
uint16_t y0 = 0;
uint16_t y1 = height -1;
if (width == 64) {
// displays with width of 64 pixels are shifted by 32
x0 += 32;
x1 += 32;
}
uint16_t num_of_pages = height / 8;
set_col(x0, x1);
set_page(y0, y1);
mp_hal_pin_high(mp_dc_pin);
mp_hal_pin_low(mp_cs_pin);
for (uint16_t i = 0; i < (width * num_of_pages); i++) {
raw_write(color);
}
mp_hal_pin_high(mp_cs_pin);
}
void driver_ssd1306_update_line(uint16_t line, fb_byte_t * p_bytes, uint16_t len, bool compressed) {
}
#endif