收到极海的开发板，首先要驱动一下自己正在做的一个项目的外设，OLED屏幕显示！
1、考虑到模块移植的通用性，所以选择了模拟IIC驱动
GPIO初始化SDA和SCL引脚
void OLED_GPIO_Init(void)
{
GPIO_Config_T configStruct;
RCM_EnableAHB1PeriphClock(RCM_AHB1_PERIPH_GPIOD);
GPIO_ConfigStructInit(&configStruct);
configStruct.pin = SDA_PIN | SCL_PIN;
configStruct.mode = GPIO_MODE_OUT;
configStruct.speed = GPIO_SPEED_50MHz;
GPIO_Config(SDA_PORT, &configStruct);
GPIO_SetBit(SDA_PORT, SDA_PIN);
GPIO_SetBit(SCL_PORT, SCL_PIN);
}
设置输入和输出方向
void SDA2_OUT()
{
GPIO_Config_T configStruct;
GPIO_ConfigStructInit(&configStruct);
configStruct.pin = SDA_PIN;
configStruct.mode = GPIO_MODE_OUT;
configStruct.speed = GPIO_SPEED_50MHz;
GPIO_Config(SDA_PORT, &configStruct);
}
void SDA2_IN()
{
GPIO_Config_T configStruct;
GPIO_ConfigStructInit(&configStruct);
configStruct.pin = SDA_PIN;
configStruct.mode = GPIO_MODE_IN;
configStruct.pupd = GPIO_PUPD_UP;
GPIO_Config(SDA_PORT, &configStruct);
}
//开始信号
void IIC2_Start(void)
{
SDA2_OUT();
GPIO_SetBit(SDA_PORT, SDA_PIN);
GPIO_SetBit(SCL_PORT, SCL_PIN);
Delay_us(2);
GPIO_ResetBit(SDA_PORT, SDA_PIN);
Delay_us(2);
GPIO_ResetBit(SCL_PORT, SCL_PIN);
Delay_us(2);
}
void IIC2_Stop(void)
{
GPIO_SetBit(SCL_PORT, SCL_PIN);
GPIO_ResetBit(SDA_PORT, SDA_PIN);
Delay_us(2);
GPIO_SetBit(SDA_PORT, SDA_PIN);
Delay_us(2);
}
/*
* 返回1--应答出错
* 放回0--应答正确
*/
u8 IIC_Wait_Ask(void)
{
int count=0;
SDA2_IN();
GPIO_SetBit(SCL_PORT, SCL_PIN);
Delay_us(20);
while(GPIO_ReadInputBit(SDA_PORT, SDA_PIN))
{
count++;
if(count>250)
{
IIC2_Stop();
return 1;
}
}
GPIO_ResetBit(SCL_PORT, SCL_PIN);
Delay_us(2);
return 0;
}
//写一个字节
void IIC_WriteByte(u8 data)
{
u8 i;
SDA2_OUT();
for(i=0;i<8;i++)
{
GPIO_ResetBit(SCL_PORT, SCL_PIN);
Delay_us(2);
if(data & 0x80) //MSB,从高位开始一位一位传输
GPIO_SetBit(SDA_PORT, SDA_PIN);
else
GPIO_ResetBit(SDA_PORT, SDA_PIN);
GPIO_SetBit(SCL_PORT, SCL_PIN);
Delay_us(2);
GPIO_ResetBit(SCL_PORT, SCL_PIN);
data<<=1;
}
}
void WriteCmd(u8 command)
{
IIC2_Start();
IIC_WriteByte(0x78);//OLED地址
IIC_Wait_Ask();
IIC_WriteByte(0x00);//寄存器地址
IIC_Wait_Ask();
IIC_WriteByte(command);
IIC_Wait_Ask();
IIC2_Stop();
}
void WriteDat(u8 data)
{
IIC2_Start();
IIC_WriteByte(0x78);//OLED地址
IIC_Wait_Ask();
IIC_WriteByte(0x40);//寄存器地址
IIC_Wait_Ask();
IIC_WriteByte(data);
IIC_Wait_Ask();
IIC2_Stop();
}
void OLED_Init(void)
{
Delay_ms(100); //这里的延时很重要
WriteCmd(0xAE); //display off
WriteCmd(0x20); //Set Memory Addressing Mode
WriteCmd(0x10); //00,Horizontal Addressing Mode;01,Vertical Addressing Mode;10,Page Addressing Mode (RESET);11,Invalid
WriteCmd(0xb0); //Set Page Start Address for Page Addressing Mode,0-7
WriteCmd(0xc8); //Set COM Output Scan Direction
WriteCmd(0x00); //---set low column address
WriteCmd(0x10); //---set high column address
WriteCmd(0x40); //--set start line address
WriteCmd(0x81); //--set contrast control register
WriteCmd(0xff); //???? 0x00~0xff
WriteCmd(0xa1); //--set segment re-map 0 to 127
WriteCmd(0xa6); //--set normal display
WriteCmd(0xa8); //--set multiplex ratio(1 to 64)
WriteCmd(0x3F); //
WriteCmd(0xa4); //0xa4,Output follows RAM content;0xa5,Output ignores RAM content
WriteCmd(0xd3); //-set display offset
WriteCmd(0x00); //-not offset
WriteCmd(0xd5); //--set display clock divide ratio/oscillator frequency
WriteCmd(0xf0); //--set divide ratio
WriteCmd(0xd9); //--set pre-charge period
WriteCmd(0x22); //
WriteCmd(0xda); //--set com pins hardware configuration
WriteCmd(0x12);
WriteCmd(0xdb); //--set vcomh
WriteCmd(0x20); //0x20,0.77xVcc
WriteCmd(0x8d); //--set DC-DC enable
WriteCmd(0x14); //
WriteCmd(0xaf); //--turn on oled panel
OLED_CLS();
}
/**
* [url=home.php?mod=space&uid=247401]@brief[/url] OLED_ON，将OLED从休眠中唤醒
* @param 无
* @retval 无
*/
void OLED_ON(void)
{
WriteCmd(0X8D); //设置电荷泵
WriteCmd(0X14); //开启电荷泵
WriteCmd(0XAF); //OLED唤醒
}
/**
* @brief OLED_SetPos，设置光标
* @param x,光标x位置
* y，光标y位置
* @retval 无
*/
void OLED_SetPos(unsigned char x, unsigned char y) //设置起始点坐标
{
WriteCmd(0xb0+y);
WriteCmd(((x&0xf0)>>4)|0x10);
WriteCmd((x&0x0f)|0x01);
}
/**
* @brief OLED_Fill，填充整个屏幕
* @param fill_Data:要填充的数据
* @retval 无
*/
void OLED_Fill(unsigned char fill_Data)//全屏填充
{
unsigned char m,n;
for(m=0;m<8;m++)
{
WriteCmd(0xb0+m); //page0-page1
WriteCmd(0x00); //low column start address
WriteCmd(0x10); //high column start address
for(n=0;n<128;n++)
{
WriteDat(fill_Data);
}
}
}
void OLED_CLS(void)//清屏
{
OLED_Fill(0x00);
}
void OLED_ShowStr(unsigned char x, unsigned char y, unsigned char ch[], unsigned char TextSize)
{
unsigned char c = 0,i = 0,j = 0;
switch(TextSize)
{
case 1:
{
while(ch[j] != '\0')
{
c = ch[j] - 32;
if(x > 126)
{
x = 0;
y++;
}
OLED_SetPos(x,y);
for(i=0;i<6;i++)
WriteDat(F6x8[c][i]);
x += 6;
j++;
}
}break;
case 2:
{
while(ch[j] != '\0')
{
c = ch[j] - 32;
if(x > 120)
{
x = 0;
y++;
}
OLED_SetPos(x,y);
for(i=0;i<8;i++)
WriteDat(F8X16[c*16+i]);
OLED_SetPos(x,y+1);
for(i=0;i<8;i++)
WriteDat(F8X16[c*16+i+8]);
x += 8;
j++;
}
}break;
}
}
unsigned char name8[] = "Geehy";
unsigned char name7[] = "BBS: 21ic.com";
unsigned char name6[] = "Mode: IIC\0";
unsigned char name5[] = "Drv: OLED\0";
int main(void)
{
/* Set system interrupt priority grouping */
NVIC_ConfigPriorityGroup(NVIC_PRIORITY_GROUP_2);
/* Init delay function */
Delay_Init();
/* Init LED */
APM_LEDInit(LED2);
APM_LEDInit(LED3);
OLED_Init();
OLED_CLS();
OLED_ShowStr(40, 0, name8, 2);
OLED_ShowStr(0, 2, name7, 2);
OLED_ShowStr(0, 4, name6, 2);
OLED_ShowStr(0, 6, name5, 2);
while(1)
{
Delay_ms(500);
GPIOE->ODATA ^= GPIO_PIN_5;
GPIOE->ODATA ^= GPIO_PIN_6;
}
}
最后看效果图
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