- while(1)
- {
- // Set the GPIO high.
- GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_3, GPIO_PIN_3);
- // Delay for a while.
- SysCtlDelay(1000000);
- // Set the GPIO low.
- GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_3, 0);
- // Delay for a while.
- SysCtlDelay(1000000);
- }
原来输出低电平是这样用：GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_3, 0);
而输出高电平则是：GPIOPinWrite(GPIO_PORTF_BASE, GPIO_PIN_3, GPIO_PIN_3);
延时则是这样来实现： SysCtlDelay(1000000);
下面就看看IIC接口的双色OLED屏怎样来控制，首先要确定一下连接关系，即SCLK与PD6连接，SDIN与PD3连接。这样就可以如下来定义输出电平的高低：
#define OLED_SCLK_Clr() GPIOPinWrite(GPIO_PORTD_BASE, GPIO_PIN_6, 0)
#define OLED_SCLK_Set() GPIOPinWrite(GPIO_PORTD_BASE, GPIO_PIN_6, GPIO_PIN_6)
#define OLED_SDIN_Clr() GPIOPinWrite(GPIO_PORTD_BASE, GPIO_PIN_3, 0);
#define OLED_SDIN_Set() GPIOPinWrite(GPIO_PORTD_BASE, GPIO_PIN_3, GPIO_PIN_3) ;
随后可以用下面的语句来设置PD3和PD6为输出口：
SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
SysCtlDelay(1);
GPIOPinTypeGPIOOutput(GPIO_PORTD_BASE, GPIO_PIN_6|GPIO_PIN_3);
有了前面的准备工作，再配上中英文的小字库，就可以在OLED原驱动程序的基础上来实现显示功能了。
对应的OLED初始化程序如下：
- //SSD1306
- void OLED_Init(void)
- {
- OLED_SCLK_Set();
- OLED_SDIN_Set();
- Delay_1ms(800);
- OLED_WR_Byte(0xAE,OLED_CMD);//--display off
- 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
- OLED_WR_Byte(0xB0,OLED_CMD);//--set page address
- OLED_WR_Byte(0x81,OLED_CMD); // contract control
- OLED_WR_Byte(0xFF,OLED_CMD);//--128
- OLED_WR_Byte(0xA1,OLED_CMD);//set segment remap
- OLED_WR_Byte(0xA6,OLED_CMD);//--normal / reverse
- d OLED_WR_Byte(0xA8,OLED_CMD);//--set multiplex ratio(1 to 64)
- OLED_WR_Byte(0x3F,OLED_CMD);//--1/32 duty
- OLED_WR_Byte(0xC8,OLED_CMD);//Com scan direction
- OLED_WR_Byte(0xD3,OLED_CMD);//-set display offset
- OLED_WR_Byte(0x00,OLED_CMD);//
- OLED_WR_Byte(0xD5,OLED_CMD);//set osc division
- OLED_WR_Byte(0x80,OLED_CMD);//
- OLED_WR_Byte(0xD8,OLED_CMD);//set area color mode off
- OLED_WR_Byte(0x05,OLED_CMD);//
- OLED_WR_Byte(0xD9,OLED_CMD);//Set Pre-Charge Period
- OLED_WR_Byte(0xF1,OLED_CMD);//
- OLED_WR_Byte(0xDA,OLED_CMD);//set com pin configuartion
- OLED_WR_Byte(0x12,OLED_CMD);//
- OLED_WR_Byte(0xDB,OLED_CMD);//set Vcomh
- OLED_WR_Byte(0x30,OLED_CMD);//
- OLED_WR_Byte(0x8D,OLED_CMD);//set charge pump enable
- OLED_WR_Byte(0x14,OLED_CMD);//
-
- OLED_WR_Byte(0xAF,OLED_CMD);//--turn on oled panel
- }
下图是为MP3点播器制作的界面效果，在添加键控函数和通讯函数的条件下，可以实现MP3的播放，其主程序为：
- int main(void)
- {
- // Enable the GPIO module.
- SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
- SysCtlDelay(1);
- // Configure PD as an output.
- SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
- SysCtlDelay(1);
- GPIOPinTypeGPIOOutput(GPIO_PORTD_BASE, GPIO_PIN_6|GPIO_PIN_3);
- OLED_Init();
- OLED_Clear();
- OLED_ShowString(2,0,"mini MP3",16);
- OLED_ShowCHinese(72,0,33);
- OLED_ShowCHinese(90,0,34);
- OLED_ShowCHinese(108,0,35);
- OLED_ShowCHinese(2,2,36);
- OLED_ShowCHinese(20,2,37);
- OLED_ShowString(40,2,":jinglixixi",16);
- OLED_ShowString(32,6,"2016.7.2",16);
- while(1);
- }
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