電子發(fā)燒友App
OLED，即有機(jī)發(fā)光二極管（ Organic Light Emitting Diode）。 OLED 由于同時(shí)具備自發(fā)光，不需背 光源、對(duì)比度高、厚度薄、視角廣、反應(yīng)速度快、可用于撓曲性面板、使用溫度范圍廣、構(gòu)造及 制程較簡(jiǎn)單等優(yōu)異之特性，被認(rèn)為是下一代的平面顯示器新興應(yīng)用技術(shù)。
LCD 都需要背光，而 OLED 不需要，因?yàn)樗亲园l(fā)光的。這樣同樣的顯示 OLED 效果要來(lái)得好一 些。以目前的技術(shù)，OLED 的尺寸還難以大型化，但是分辨率確可以做到很高。
在此我們使用的 是0.96寸OLED顯示屏，該屏有以下特點(diǎn)：
- 0.96 寸 OLED 有黃藍(lán)，白，藍(lán)三種顏色可選；其中黃藍(lán)是屏上 1/4 部分為黃光，下 3/4 為藍(lán)； 而且是固定區(qū)域顯示固定顏色，顏色和顯示區(qū)域均不能修改；白光則為純白，也就是黑底白字； 藍(lán)色則為純藍(lán)，也就是黑底藍(lán)字。
- 分辨率為 128*64
- 多種接口方式；OLED 裸屏總共種接口包括：6800、8080 兩種并行接口方式、3 線或 4 線的 串行 SPI 接口方式、 IIC 接口方式（只需要 2 根線就可以控制 OLED 了?。@五種接口是通過(guò)屏上的 BS0~BS2 來(lái)配置的。
本次使用的是四針的IIC 模塊，如下圖：
引腳配置如下
R128 Devkit
OLED
PA23
SCL
PA24
SDA
GND
GND
3V3
VCC
載入方案
我們使用的開(kāi)發(fā)板是 R128-Devkit，需要開(kāi)發(fā) C906 核心的應(yīng)用程序，所以載入方案選擇 r128s2_module_c906
$ source envsetup.sh
$ lunch_rtos 1
設(shè)置 TWI 驅(qū)動(dòng)
運(yùn)行 mrtos_menuconfig 進(jìn)入配置頁(yè)面。前往下列地址找到 TWI Devices
Drivers Options --- >
soc related device drivers --- >
TWI Devices --- >
-*- enable twi driver
配置 TWI 引腳
打開(kāi)你喜歡的編輯器，修改文件：board/r128s2/module/configs/sys_config.fex
增加 TWI0 的配置，參考手冊(cè)可知 PA23，PA24 的 TWI0 復(fù)用為 6
[twi0]
twi0_sck = port:PA23< 6 >< 1 >< default >< default >
twi0_sda = port:PA24< 6 >< 1 >< default >< default >
編寫(xiě)程序
打開(kāi)你喜歡的編輯器，新增文件：lichee/rtos/projects/r128s2/module_c906/src/oled.c 用于編寫(xiě) OLED 的驅(qū)動(dòng)。
編寫(xiě) OLED 驅(qū)動(dòng)
使用一個(gè)宏儲(chǔ)存 TWI 的地址和使用的 TWI 端口，并定義顯存。
#define OLED_IIC_ADDR 0x3c
#define OLED_IIC_PORT 0
uint8_t OLED_GRAM[144][8]; /* 顯存 */
編寫(xiě) OLED 的基礎(chǔ)操作驅(qū)動(dòng) TWI 通訊函數(shù)。
#define OLED_CMD 0 /*寫(xiě)命令 */
#define OLED_DATA 1 /* 寫(xiě)數(shù)據(jù) */
void OLED_WR_Byte(uint8_t dat, uint8_t mode)
{
twi_msg_t msg;
twi_port_t port = OLED_IIC_PORT;
uint8_t buf[2];
if (mode)
buf[0] = 0x40;
else
buf[0] = 0x00;
buf[1] = dat;
msg.flags = 0;
msg.addr = OLED_IIC_ADDR;
msg.len = 2;
msg.buf = buf;
hal_twi_control(port, I2C_RDWR, &msg);
}
編寫(xiě) OLED 的驅(qū)動(dòng)函數(shù)：顯示開(kāi)關(guān)
void OLED_ColorTurn(uint8_t i)
{
if (i == 0) {
OLED_WR_Byte(0xA6, OLED_CMD); /* 正常顯示 */
}
if (i == 1) {
OLED_WR_Byte(0xA7, OLED_CMD); /* 反色顯示 */
}
}
編寫(xiě) OLED 的驅(qū)動(dòng)函數(shù)：反顯設(shè)置
void OLED_DisplayTurn(uint8_t i)
{
if (i == 0) {
OLED_WR_Byte(0xC8, OLED_CMD); /* 正常顯示 */
OLED_WR_Byte(0xA1, OLED_CMD);
}
if (i == 1) {
OLED_WR_Byte(0xC0, OLED_CMD); /* 反轉(zhuǎn)顯示 */
OLED_WR_Byte(0xA0, OLED_CMD);
}
}
編寫(xiě) OLED 的驅(qū)動(dòng)函數(shù)：刷新屏幕
void OLED_Refresh(void)
{
for (int i = 0; i < 8; i++) {
OLED_WR_Byte(0xb0 + i, OLED_CMD); //設(shè)置行起始地址
OLED_WR_Byte(0x00, OLED_CMD); //設(shè)置低列起始地址
OLED_WR_Byte(0x10, OLED_CMD); //設(shè)置高列起始地址
OLED_WR_Byte(0x78, OLED_DATA);
OLED_WR_Byte(0x40, OLED_DATA);
for (int n = 0; n < 128; n++) {
OLED_WR_Byte(OLED_GRAM[n][i], OLED_DATA);
}
}
}
編寫(xiě) OLED 的驅(qū)動(dòng)函數(shù)：清屏
void OLED_Clear(void)
{
for (int i = 0; i < 8; i++) {
OLED_WR_Byte(0xb0 + i, OLED_CMD); //設(shè)置頁(yè)地址（0~7）
OLED_WR_Byte(0x00, OLED_CMD); //設(shè)置顯示位置—列低地址
OLED_WR_Byte(0x10, OLED_CMD); //設(shè)置顯示位置—列高地址
for (int n = 0; n < 128; n++)
OLED_GRAM[n][i] = 0;
OLED_Refresh(); //刷新GRAM內(nèi)容
}
}
編寫(xiě) OLED 的驅(qū)動(dòng)函數(shù)：畫(huà)點(diǎn)
void OLED_DrawPoint(uint8_t x, uint8_t y, uint8_t t)
{
uint8_t i, m, n;
i = y / 8;
m = y % 8;
n = 1 < < m;
if (t) {
OLED_GRAM[x][i] |= n;
}
else {
OLED_GRAM[x][i] = ~OLED_GRAM[x][i];
OLED_GRAM[x][i] |= n;
OLED_GRAM[x][i] = ~OLED_GRAM[x][i];
}
}
編寫(xiě) OLED 的驅(qū)動(dòng)函數(shù)：畫(huà)線
void OLED_DrawLine(uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2, uint8_t mode)
{
int xerr = 0, yerr = 0, delta_x, delta_y, distance;
int incx, incy, uRow, uCol;
delta_x = x2 - x1; //計(jì)算坐標(biāo)增量
delta_y = y2 - y1;
uRow = x1; //畫(huà)線起點(diǎn)坐標(biāo)
uCol = y1;
if (delta_x > 0)
incx = 1; //設(shè)置單步方向
else if (delta_x == 0)
incx = 0; //垂直線
else {
incx = -1;
delta_x = -delta_x;
}
if (delta_y > 0)
incy = 1;
else if (delta_y == 0)
incy = 0; //水平線
else {
incy = -1;
delta_y = -delta_x;
}
if (delta_x > delta_y)
distance = delta_x; //選取基本增量坐標(biāo)軸
else
distance = delta_y;
for (uint16_t t = 0; t < distance + 1; t++) {
OLED_DrawPoint(uRow, uCol, mode); //畫(huà)點(diǎn)
xerr += delta_x;
yerr += delta_y;
if (xerr > distance) {
xerr -= distance;
uRow += incx;
}
if (yerr > distance) {
yerr -= distance;
uCol += incy;
}
}
}
編寫(xiě) OLED 的驅(qū)動(dòng)函數(shù)：畫(huà)園
void OLED_DrawCircle(uint8_t x, uint8_t y, uint8_t r)
{
int a, b, num;
a = 0;
b = r;
while (2 * b * b >= r * r) {
OLED_DrawPoint(x + a, y - b, 1);
OLED_DrawPoint(x - a, y - b, 1);
OLED_DrawPoint(x - a, y + b, 1);
OLED_DrawPoint(x + a, y + b, 1);
OLED_DrawPoint(x + b, y + a, 1);
OLED_DrawPoint(x + b, y - a, 1);
OLED_DrawPoint(x - b, y - a, 1);
OLED_DrawPoint(x - b, y + a, 1);
a++;
num = (a * a + b * b) - r * r; //計(jì)算畫(huà)的點(diǎn)離圓心的距離
if (num > 0) {
b--;
a--;
}
}
}
編寫(xiě) OLED 的驅(qū)動(dòng)函數(shù)：顯示字符
void OLED_ShowChar(uint8_t x, uint8_t y, uint8_t chr, uint8_t size1, uint8_t mode)
{
uint8_t temp, size2, chr1;
uint8_t x0 = x, y0 = y;
if (size1 == 8)
size2 = 6;
else
size2 = (size1 / 8 + ((size1 % 8) ? 1 : 0)) * (size1 / 2); //得到字體一個(gè)字符對(duì)應(yīng)點(diǎn)陣集所占的字節(jié)數(shù)
chr1 = chr - ' '; //計(jì)算偏移后的值
for (uint8_t i = 0; i < size2; i++) {
if (size1 == 8) {
temp = asc2_0806[chr1][i];
} //調(diào)用0806字體
else if (size1 == 12) {
temp = asc2_1206[chr1][i];
} //調(diào)用1206字體
else if (size1 == 16) {
temp = asc2_1608[chr1][i];
} //調(diào)用1608字體
else if (size1 == 24) {
temp = asc2_2412[chr1][i];
} //調(diào)用2412字體
else
return;
for (uint8_t m = 0; m < 8; m++) {
if (temp & 0x01)
OLED_DrawPoint(x, y, mode);
else
OLED_DrawPoint(x, y, !mode);
temp > >= 1;
y++;
}
x++;
if ((size1 != 8) && ((x - x0) == size1 / 2)) {
x = x0;
y0 = y0 + 8;
}
y = y0;
}
}
編寫(xiě) OLED 的驅(qū)動(dòng)函數(shù)：顯示字符串
void OLED_ShowString(uint8_t x, uint8_t y, uint8_t* chr, uint8_t size1, uint8_t mode)
{
while ((*chr >= ' ') && (*chr <= '~')) //判斷是不是非法字符!
{
OLED_ShowChar(x, y, *chr, size1, mode);
if (size1 == 8)
x += 6;
else
x += size1 / 2;
chr++;
}
}
編寫(xiě) OLED 的驅(qū)動(dòng)函數(shù)：顯示數(shù)字
void OLED_ShowNum(uint8_t x, uint8_t y, uint32_t num, uint8_t len, uint8_t size1, uint8_t mode)
{
uint8_t temp, m = 0;
if (size1 == 8)
m = 2;
for (uint8_t t = 0; t < len; t++) {
temp = (num / OLED_Pow(10, len - t - 1)) % 10;
if (temp == 0) {
OLED_ShowChar(x + (size1 / 2 + m) * t, y, '0', size1, mode);
}
else {
OLED_ShowChar(x + (size1 / 2 + m) * t, y, temp + '0', size1, mode);
}
}
}
編寫(xiě) OLED 的驅(qū)動(dòng)函數(shù)：配置位置
void OLED_Set_Pos(uint8_t x, uint8_t y)
{
OLED_WR_Byte(0xb0 + y, OLED_CMD);
OLED_WR_Byte(((x & 0xf0) > > 4) | 0x10, OLED_CMD);
OLED_WR_Byte((x & 0x0f), OLED_CMD);
}
編寫(xiě) OLED 的驅(qū)動(dòng)函數(shù)：初始化屏幕
void OLED_Init(void)
{
hal_twi_init(OLED_IIC_PORT); //-- init TWI
OLED_WR_Byte(0xAE, OLED_CMD);//--turn off oled panel
OLED_WR_Byte(0x00, OLED_CMD);//---set low column address
OLED_WR_Byte(0x10, OLED_CMD);//---set high column address
OLED_WR_Byte(0x40, OLED_CMD);//--set start line address Set Mapping RAM Display Start Line (0x00~0x3F)
OLED_WR_Byte(0x81, OLED_CMD);//--set contrast control register
OLED_WR_Byte(0xCF, OLED_CMD); // Set SEG Output Current Brightness
OLED_WR_Byte(0xA1, OLED_CMD);//--Set SEG/Column Mapping 0xa0左右反置 0xa1正常
OLED_WR_Byte(0xC8, OLED_CMD);//Set COM/Row Scan Direction 0xc0上下反置 0xc8正常
OLED_WR_Byte(0xA6, OLED_CMD);//--set normal display
OLED_WR_Byte(0xA8, OLED_CMD);//--set multiplex ratio(1 to 64)
OLED_WR_Byte(0x3f, OLED_CMD);//--1/64 duty
OLED_WR_Byte(0xD3, OLED_CMD);//-set display offset Shift Mapping RAM Counter (0x00~0x3F)
OLED_WR_Byte(0x00, OLED_CMD);//-not offset
OLED_WR_Byte(0xd5, OLED_CMD);//--set display clock divide ratio/oscillator frequency
OLED_WR_Byte(0x80, OLED_CMD);//--set divide ratio, Set Clock as 100 Frames/Sec
OLED_WR_Byte(0xD9, OLED_CMD);//--set pre-charge period
OLED_WR_Byte(0xF1, OLED_CMD);//Set Pre-Charge as 15 Clocks & Discharge as 1 Clock
OLED_WR_Byte(0xDA, OLED_CMD);//--set com pins hardware configuration
OLED_WR_Byte(0x12, OLED_CMD);
OLED_WR_Byte(0xDB, OLED_CMD);//--set vcomh
OLED_WR_Byte(0x40, OLED_CMD);//Set VCOM Deselect Level
OLED_WR_Byte(0x20, OLED_CMD);//-Set Page Addressing Mode (0x00/0x01/0x02)
OLED_WR_Byte(0x02, OLED_CMD);//
OLED_WR_Byte(0x8D, OLED_CMD);//--set Charge Pump enable/disable
OLED_WR_Byte(0x14, OLED_CMD);//--set(0x10) disable
OLED_WR_Byte(0xA4, OLED_CMD);// Disable Entire Display On (0xa4/0xa5)
OLED_WR_Byte(0xA6, OLED_CMD);// Disable Inverse Display On (0xa6/a7)
OLED_Clear();
OLED_WR_Byte(0xAF, OLED_CMD); /*display ON*/
}
我們把這些驅(qū)動(dòng)放到一個(gè)單獨(dú)的文件里，命名為 oled.c，完整內(nèi)容如下：
#include < sunxi_hal_twi.h >
#include "oledfont.h"
#define OLED_IIC_ADDR 0x3c
#define OLED_IIC_PORT 0
#define OLED_CMD 0 /*寫(xiě)命令 */
#define OLED_DATA 1 /* 寫(xiě)數(shù)據(jù) */
uint8_t OLED_GRAM[144][8]; /* 顯存 */
void OLED_WR_Byte(uint8_t dat, uint8_t mode)
{
twi_msg_t msg;
twi_port_t port = OLED_IIC_PORT;
uint8_t buf[2];
if (mode)
buf[0] = 0x40;
else
buf[0] = 0x00;
buf[1] = dat;
msg.flags = 0;
msg.addr = OLED_IIC_ADDR;
msg.len = 2;
msg.buf = buf;
hal_twi_control(port, I2C_RDWR, &msg);
}
uint32_t OLED_Pow(uint8_t m, uint8_t n)
{
uint32_t result = 1;
while (n--)
result *= m;
return result;
}
void OLED_ColorTurn(uint8_t i)
{
if (i == 0) {
OLED_WR_Byte(0xA6, OLED_CMD); /* 正常顯示 */
}
if (i == 1) {
OLED_WR_Byte(0xA7, OLED_CMD); /* 反色顯示 */
}
}
void OLED_DisplayTurn(uint8_t i)
{
if (i == 0) {
OLED_WR_Byte(0xC8, OLED_CMD); /* 正常顯示 */
OLED_WR_Byte(0xA1, OLED_CMD);
}
if (i == 1) {
OLED_WR_Byte(0xC0, OLED_CMD); /* 反轉(zhuǎn)顯示 */
OLED_WR_Byte(0xA0, OLED_CMD);
}
}
void OLED_Refresh(void)
{
for (int i = 0; i < 8; i++) {
OLED_WR_Byte(0xb0 + i, OLED_CMD); //設(shè)置行起始地址
OLED_WR_Byte(0x00, OLED_CMD); //設(shè)置低列起始地址
OLED_WR_Byte(0x10, OLED_CMD); //設(shè)置高列起始地址
OLED_WR_Byte(0x78, OLED_DATA);
OLED_WR_Byte(0x40, OLED_DATA);
for (int n = 0; n < 128; n++) {
OLED_WR_Byte(OLED_GRAM[n][i], OLED_DATA);
}
}
}
void OLED_Clear(void)
{
for (int i = 0; i < 8; i++) {
OLED_WR_Byte(0xb0 + i, OLED_CMD); //設(shè)置頁(yè)地址（0~7）
OLED_WR_Byte(0x00, OLED_CMD); //設(shè)置顯示位置—列低地址
OLED_WR_Byte(0x10, OLED_CMD); //設(shè)置顯示位置—列高地址
for (int n = 0; n < 128; n++)
OLED_GRAM[n][i] = 0;
OLED_Refresh(); //刷新GRAM內(nèi)容
}
}
void OLED_DrawPoint(uint8_t x, uint8_t y, uint8_t t)
{
uint8_t i, m, n;
i = y / 8;
m = y % 8;
n = 1 < < m;
if (t) {
OLED_GRAM[x][i] |= n;
}
else {
OLED_GRAM[x][i] = ~OLED_GRAM[x][i];
OLED_GRAM[x][i] |= n;
OLED_GRAM[x][i] = ~OLED_GRAM[x][i];
}
}
void OLED_DrawLine(uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2, uint8_t mode)
{
int xerr = 0, yerr = 0, delta_x, delta_y, distance;
int incx, incy, uRow, uCol;
delta_x = x2 - x1; //計(jì)算坐標(biāo)增量
delta_y = y2 - y1;
uRow = x1; //畫(huà)線起點(diǎn)坐標(biāo)
uCol = y1;
if (delta_x > 0)
incx = 1; //設(shè)置單步方向
else if (delta_x == 0)
incx = 0; //垂直線
else {
incx = -1;
delta_x = -delta_x;
}
if (delta_y > 0)
incy = 1;
else if (delta_y == 0)
incy = 0; //水平線
else {
incy = -1;
delta_y = -delta_x;
}
if (delta_x > delta_y)
distance = delta_x; //選取基本增量坐標(biāo)軸
else
distance = delta_y;
for (uint16_t t = 0; t < distance + 1; t++) {
OLED_DrawPoint(uRow, uCol, mode); //畫(huà)點(diǎn)
xerr += delta_x;
yerr += delta_y;
if (xerr > distance) {
xerr -= distance;
uRow += incx;
}
if (yerr > distance) {
yerr -= distance;
uCol += incy;
}
}
}
void OLED_DrawCircle(uint8_t x, uint8_t y, uint8_t r)
{
int a, b, num;
a = 0;
b = r;
while (2 * b * b >= r * r) {
OLED_DrawPoint(x + a, y - b, 1);
OLED_DrawPoint(x - a, y - b, 1);
OLED_DrawPoint(x - a, y + b, 1);
OLED_DrawPoint(x + a, y + b, 1);
OLED_DrawPoint(x + b, y + a, 1);
OLED_DrawPoint(x + b, y - a, 1);
OLED_DrawPoint(x - b, y - a, 1);
OLED_DrawPoint(x - b, y + a, 1);
a++;
num = (a * a + b * b) - r * r; //計(jì)算畫(huà)的點(diǎn)離圓心的距離
if (num > 0) {
b--;
a--;
}
}
}
void OLED_ShowChar(uint8_t x, uint8_t y, uint8_t chr, uint8_t size1, uint8_t mode)
{
uint8_t temp, size2, chr1;
uint8_t x0 = x, y0 = y;
if (size1 == 8)
size2 = 6;
else
size2 = (size1 / 8 + ((size1 % 8) ? 1 : 0)) * (size1 / 2); //得到字體一個(gè)字符對(duì)應(yīng)點(diǎn)陣集所占的字節(jié)數(shù)
chr1 = chr - ' '; //計(jì)算偏移后的值
for (uint8_t i = 0; i < size2; i++) {
if (size1 == 8) {
temp = asc2_0806[chr1][i];
} //調(diào)用0806字體
else if (size1 == 12) {
temp = asc2_1206[chr1][i];
} //調(diào)用1206字體
else if (size1 == 16) {
temp = asc2_1608[chr1][i];
} //調(diào)用1608字體
else if (size1 == 24) {
temp = asc2_2412[chr1][i];
} //調(diào)用2412字體
else
return;
for (uint8_t m = 0; m < 8; m++) {
if (temp & 0x01)
OLED_DrawPoint(x, y, mode);
else
OLED_DrawPoint(x, y, !mode);
temp > >= 1;
y++;
}
x++;
if ((size1 != 8) && ((x - x0) == size1 / 2)) {
x = x0;
y0 = y0 + 8;
}
y = y0;
}
}
void OLED_ShowString(uint8_t x, uint8_t y, uint8_t* chr, uint8_t size1, uint8_t mode)
{
while ((*chr >= ' ') && (*chr <= '~')) //判斷是不是非法字符!
{
OLED_ShowChar(x, y, *chr, size1, mode);
if (size1 == 8)
x += 6;
else
x += size1 / 2;
chr++;
}
}
void OLED_ShowNum(uint8_t x, uint8_t y, uint32_t num, uint8_t len, uint8_t size1, uint8_t mode)
{
uint8_t temp, m = 0;
if (size1 == 8)
m = 2;
for (uint8_t t = 0; t < len; t++) {
temp = (num / OLED_Pow(10, len - t - 1)) % 10;
if (temp == 0) {
OLED_ShowChar(x + (size1 / 2 + m) * t, y, '0', size1, mode);
}
else {
OLED_ShowChar(x + (size1 / 2 + m) * t, y, temp + '0', size1, mode);
}
}
}
void OLED_Set_Pos(uint8_t x, uint8_t y)
{
OLED_WR_Byte(0xb0 + y, OLED_CMD);
OLED_WR_Byte(((x & 0xf0) > > 4) | 0x10, OLED_CMD);
OLED_WR_Byte((x & 0x0f), OLED_CMD);
}
void OLED_Init(void)
{
hal_twi_init(OLED_IIC_PORT); //-- init TWI
OLED_WR_Byte(0xAE, OLED_CMD);//--turn off oled panel
OLED_WR_Byte(0x00, OLED_CMD);//---set low column address
OLED_WR_Byte(0x10, OLED_CMD);//---set high column address
OLED_WR_Byte(0x40, OLED_CMD);//--set start line address Set Mapping RAM Display Start Line (0x00~0x3F)
OLED_WR_Byte(0x81, OLED_CMD);//--set contrast control register
OLED_WR_Byte(0xCF, OLED_CMD); // Set SEG Output Current Brightness
OLED_WR_Byte(0xA1, OLED_CMD);//--Set SEG/Column Mapping 0xa0左右反置 0xa1正常
OLED_WR_Byte(0xC8, OLED_CMD);//Set COM/Row Scan Direction 0xc0上下反置 0xc8正常
OLED_WR_Byte(0xA6, OLED_CMD);//--set normal display
OLED_WR_Byte(0xA8, OLED_CMD);//--set multiplex ratio(1 to 64)
OLED_WR_Byte(0x3f, OLED_CMD);//--1/64 duty
OLED_WR_Byte(0xD3, OLED_CMD);//-set display offset Shift Mapping RAM Counter (0x00~0x3F)
OLED_WR_Byte(0x00, OLED_CMD);//-not offset
OLED_WR_Byte(0xd5, OLED_CMD);//--set display clock divide ratio/oscillator frequency
OLED_WR_Byte(0x80, OLED_CMD);//--set divide ratio, Set Clock as 100 Frames/Sec
OLED_WR_Byte(0xD9, OLED_CMD);//--set pre-charge period
OLED_WR_Byte(0xF1, OLED_CMD);//Set Pre-Charge as 15 Clocks & Discharge as 1 Clock
OLED_WR_Byte(0xDA, OLED_CMD);//--set com pins hardware configuration
OLED_WR_Byte(0x12, OLED_CMD);
OLED_WR_Byte(0xDB, OLED_CMD);//--set vcomh
OLED_WR_Byte(0x40, OLED_CMD);//Set VCOM Deselect Level
OLED_WR_Byte(0x20, OLED_CMD);//-Set Page Addressing Mode (0x00/0x01/0x02)
OLED_WR_Byte(0x02, OLED_CMD);//
OLED_WR_Byte(0x8D, OLED_CMD);//--set Charge Pump enable/disable
OLED_WR_Byte(0x14, OLED_CMD);//--set(0x10) disable
OLED_WR_Byte(0xA4, OLED_CMD);// Disable Entire Display On (0xa4/0xa5)
OLED_WR_Byte(0xA6, OLED_CMD);// Disable Inverse Display On (0xa6/a7)
OLED_Clear();
OLED_WR_Byte(0xAF, OLED_CMD); /*display ON*/
}
同時(shí)提供對(duì)應(yīng)的頭文件 oled.h，oledfont.h 由于較大，見(jiàn)文章末尾。
#ifndef __OLED_H
#define __OLED_H
/* 發(fā)送一個(gè)字節(jié)
* mode:數(shù)據(jù)/命令標(biāo)志 0,表示命令;1,表示數(shù)據(jù);
*/
void OLED_WR_Byte(uint8_t dat, uint8_t mode);
/* Pow 函數(shù) */
uint32_t OLED_Pow(uint8_t m, uint8_t n);
/* 反顯函數(shù) */
void OLED_ColorTurn(uint8_t i);
/* 屏幕旋轉(zhuǎn)180度 */
void OLED_DisplayTurn(uint8_t i);
/* 更新顯存到OLED */
void OLED_Refresh(void);
/* OLED 清屏 */
void OLED_Clear(void);
/* 畫(huà)點(diǎn)
* x: 0~127
* y: 0~63
* t: 1 填充 0,清空
*/
void OLED_DrawPoint(uint8_t x, uint8_t y, uint8_t t);
/* 畫(huà)線
* x1, y1: 起點(diǎn)坐標(biāo)
* x2, y2: 結(jié)束坐標(biāo)
*/
void OLED_DrawLine(uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2, uint8_t mode);
/* 畫(huà)圓
* x, y: 圓心坐標(biāo)
* r: 圓的半徑
*/
void OLED_DrawCircle(uint8_t x, uint8_t y, uint8_t r);
/* 在指定位置顯示一個(gè)字符,包括部分字符
* x: 0 ~ 127
* y: 0 ~ 63
* size1: 選擇字體 6x8/6x12/8x16/12x24
* mode: 0,反色顯示; 1,正常顯示
*/
void OLED_ShowChar(uint8_t x, uint8_t y, uint8_t chr, uint8_t size1, uint8_t mode);
/* 顯示字符串
* x: 0 ~ 127
* y: 0 ~ 63
* *chr: 字符串起始地址
* size1: 選擇字體 6x8/6x12/8x16/12x24
* mode: 0,反色顯示; 1,正常顯示
*/
void OLED_ShowString(uint8_t x, uint8_t y, uint8_t* chr, uint8_t size1, uint8_t mode);
/* 顯示數(shù)字
* x: 0 ~ 127
* y: 0 ~ 63
* num: 要顯示的數(shù)字
* len: 數(shù)字的位數(shù)
* size1: 選擇字體 6x8/6x12/8x16/12x24
* mode: 0,反色顯示; 1,正常顯示
*/
void OLED_ShowNum(uint8_t x, uint8_t y, uint32_t num, uint8_t len, uint8_t size1, uint8_t mode);
/* 初始化 OLED */
void OLED_Init(void);
#endif
然后把 oled.c 加入編譯，修改 lichee/rtos/projects/r128s2/module_c906/Makefile加入
obj-y += src/oled.o
編寫(xiě)主程序
打開(kāi)你喜歡的編輯器，修改文件：lichee/rtos/projects/r128s2/module_c906/src/main.c
OLED_Init();
OLED_ShowString(12, 16, "====AWOL====", 16, 1);
OLED_ShowString(20, 32, "2023/08/24", 16, 1);
OLED_Refresh();
初始化 OLED，然后顯示字符串。
結(jié)果
驅(qū)動(dòng)了 OLED 屏
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