233 lines
6.6 KiB
C
233 lines
6.6 KiB
C
/*
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*
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* OLED.c
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* Functions for working with the oled screen.
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* Writes to the screen using I2C
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*/
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#include <stdio.h>
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#include <string.h>
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#include "Oled.h"
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#include "Bios.h"
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#include "I2C.h"
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#include "Font.h"
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int8_t displayOffset = 32;
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/*Setup params for the OLED screen*/
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/*http://www.displayfuture.com/Display/datasheet/controller/SSD1307.pdf*/
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/*All commands are prefixed with 0x80*/
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u8 OLED_Setup_Array[46] = { 0x80, 0xAE,/*Display off*/
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0x80, 0xD5,/*Set display clock divide ratio / osc freq*/
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0x80, 0b01010001,/**/
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0x80, 0xA8,/*Set Multiplex Ratio*/
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0x80, 16, /*16 == max brightness,39==dimmest*/
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0x80, 0xC0,/*Set COM Scan direction*/
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0x80, 0xD3,/*Set Display offset*/
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0x80, 0x00,/*0 Offset*/
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0x80, 0x40,/*Set Display start line to 0*/
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0x80, 0xA0,/*Set Segment remap to normal*/
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0x80, 0x8D,/*Unknown*/
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0x80, 0x14,/**/
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0x80, 0xDA,/*Set VCOM Pins hardware config*/
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0x80, 0x02,/*Combination 2*/
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0x80, 0x81,/*Contrast*/
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0x80, 0x33,/*51*/
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0x80, 0xD9,/*Set pre-charge period*/
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0x80, 0xF1,/**/
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0x80, 0xDB,/*Adjust VCOMH regulator ouput*/
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0x80, 0x30,/**/
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0x80, 0xA4,/*Enable the display GDDR*/
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0x80, 0XA6,/*Normal display*/
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0x80, 0xAF /*Dispaly on*/
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};
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/*
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Function: Oled_DisplayOn
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Description:Turn on the Oled display
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*/
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void Oled_DisplayOn(void) {
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u8 data[6] = { 0x80, 0X8D, 0x80, 0X14, 0x80, 0XAF };
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I2C_PageWrite(data, 6, DEVICEADDR_OLED);
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}
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/*
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Function: Oled_DisplayOff
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Description:Turn off the Oled display
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*/
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void Oled_DisplayOff(void) {
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u8 data[6] = { 0x80, 0X8D, 0x80, 0X10, 0x80, 0XAE };
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I2C_PageWrite(data, 6, DEVICEADDR_OLED);
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}
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/*
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* This sets the OLED screen to invert the screen (flip it vertically)
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* This is used if the unit is set to left hand mode
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*/
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void Oled_DisplayFlip() {
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u8 data[2] = { 0x80, 0XC8 };
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I2C_PageWrite(data, 2, DEVICEADDR_OLED);
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data[1] = 0xA1;
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I2C_PageWrite(data, 2, DEVICEADDR_OLED);
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displayOffset=0;
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}
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/*
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Description: write a command to the Oled display
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Input: number of bytes to write, array to write
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Output:
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*/
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u8* Data_Command(u8 length, u8* data) {
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int i;
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u8 tx_data[128];
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//here are are inserting the data write command at the beginning
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tx_data[0] = 0x40;
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length += 1;
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for (i = 1; i < length; i++) //Loop through the array of data
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tx_data[i] = *data++;
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I2C_PageWrite(tx_data, length, DEVICEADDR_OLED); //write out the buffer
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return data;
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}
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/*******************************************************************************
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Function:Set_ShowPos
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Description:Set the current position in GRAM that we are drawing to
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Input:x,y co-ordinates
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*******************************************************************************/
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void Set_ShowPos(u8 x, u8 y) {
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u8 pos_param[8] = { 0x80, 0xB0, 0x80, 0x21, 0x80, 0x00, 0x80, 0x7F };
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//page 0, start add = x(below) through to 0x7F (aka 127)
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pos_param[5] = x + displayOffset;/*Display offset ==0 for Lefty, == 32 for righty*/
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pos_param[1] += y;
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I2C_PageWrite(pos_param, 8, DEVICEADDR_OLED);
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}
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/*******************************************************************************
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Function:Oled_DrawArea
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Description:
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Inputs:(x,y) start point, (width,height) of enclosing rect, pointer to data
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Output: last byte written out
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*******************************************************************************/
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u8* Oled_DrawArea(u8 x0, u8 y0, u8 wide, u8 high, u8* ptr) {
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u8 m, n, y;
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n = y0 + high;
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if (y0 % 8 == 0)
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m = y0 / 8;
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else
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m = y0 / 8 + 1;
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if (n % 8 == 0)
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y = n / 8;
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else
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y = n / 8 + 1;
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for (; m < y; m++) {
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Set_ShowPos(x0, m);
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ptr = Data_Command(wide, ptr);
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}
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return ptr;
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}
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/*******************************************************************************
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Function:GPIO_Init_OLED
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Description:Init the outputs as needed for the OLED (in this case the RST line)
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*******************************************************************************/
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void GPIO_Init_OLED(void) {
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GPIO_InitTypeDef GPIO_InitStructure;
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GPIO_InitStructure.GPIO_Pin = OLED_RST_PIN;
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
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GPIO_Init(GPIOB, &GPIO_InitStructure);
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}
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/*******************************************************************************
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Function: Init_Oled
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Description: Initalizes the Oled screen
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*******************************************************************************/
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void Init_Oled(void) {
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u8 param_len;
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OLED_RST();
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delayMs(2);
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OLED_ACT(); //Toggling reset to reset the oled
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delayMs(2);
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param_len = 46;
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I2C_PageWrite((u8 *) OLED_Setup_Array, param_len, DEVICEADDR_OLED);
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}
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/*******************************************************************************
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Function:Clear_Screen
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Description:Clear the entire screen to off (black)
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*******************************************************************************/
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void Clear_Screen(void) {
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u8 tx_data[128];
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memset(tx_data, 0, 128);
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for (u8 i = 0; i < 2; i++) {
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Oled_DrawArea(0, i * 8, 128, 8, tx_data);
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}
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}
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/*
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* Draws a string onto the screen starting at the left
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*/
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void OLED_DrawString(char* string, uint8_t length) {
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for (uint8_t i = 0; i < length; i++) {
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OLED_DrawChar(string[i], i);
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}
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}
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/*
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* Draw a char onscreen at letter index x
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*/
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void OLED_DrawChar(char c, uint8_t x) {
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if (x > 7)
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return; //clipping
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x *= FONT_WIDTH; //convert to a x coordinate
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u8* ptr = (u8*) FONT;
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if (c >= 'A' && c <= 'Z') {
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ptr += (c - 'A' + 10) * (FONT_WIDTH * 2); //alpha is ofset 10 chars into the array
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} else if (c >= '0' && c <= '9')
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ptr += (c - '0') * (FONT_WIDTH * 2);
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else if (c < 10)
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ptr += (c) * (FONT_WIDTH * 2);
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else if (c == ' ') {
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//blank on space bar
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ptr += (36) * (FONT_WIDTH * 2);
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} else if (c == '<') {
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ptr += (37) * (FONT_WIDTH * 2);
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} else if (c == '>') {
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ptr += (38) * (FONT_WIDTH * 2);
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}else if (c=='.')
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{
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ptr += (39) * (FONT_WIDTH * 2);
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}
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Oled_DrawArea(x, 0, FONT_WIDTH, 16, (u8*) ptr);
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}
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/*
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* Draw a 2 digit number to the display at letter slot x
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*/
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void OLED_DrawTwoNumber(uint8_t in, uint8_t x) {
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OLED_DrawChar((in / 10) % 10, x);
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OLED_DrawChar(in % 10, x + 1);
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}
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/*
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* Draw a 3 digit number to the display at letter slot x
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*/
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void OLED_DrawThreeNumber(uint16_t in, uint8_t x) {
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OLED_DrawChar((in / 100) % 10, x);
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OLED_DrawChar((in / 10) % 10, x + 1);
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OLED_DrawChar(in % 10, x + 2);
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}
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/*
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* Draw a 4 digit number to the display at letter slot x
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*/
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void OLED_DrawFourNumber(uint16_t in, uint8_t x) {
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OLED_DrawChar((in / 1000) % 10, x);
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OLED_DrawChar((in / 100) % 10, x + 1);
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OLED_DrawChar((in / 10) % 10, x + 2);
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OLED_DrawChar(in % 10, x + 3);
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}
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