這次要測試的是驅動OLED12864顯示屏。OLED12864模塊使用的是IIC接口，SDA接RF4引腳，SCL接RF5引腳，電源為3.3V。IIC時序使用軟件模擬，采用強制讀寫模式。

1.iic.h文件

#ifndef __IIC_H

#define __IIC_H

#include

#include "system_config.h"

#define IIC_SCL(status) if(status)

PLIB_PORTS_PinSet(PORTS_ID_0, PORT_CHANNEL_F, PORTS_BIT_POS_5);

else

PLIB_PORTS_PinClear(PORTS_ID_0, PORT_CHANNEL_F, PORTS_BIT_POS_5)

#define IIC_SDA_OUT(status) if(status)

PLIB_PORTS_PinSet(PORTS_ID_0, PORT_CHANNEL_F, PORTS_BIT_POS_4);

else

PLIB_PORTS_PinClear(PORTS_ID_0, PORT_CHANNEL_F, PORTS_BIT_POS_4)

#define DELAY_US asm("nop");asm("nop");asm("nop"); asm("nop");

asm("nop");asm("nop");asm("nop"); asm("nop");

asm("nop");asm("nop");asm("nop"); asm("nop");

asm("nop");asm("nop");asm("nop"); asm("nop");

asm("nop");asm("nop");asm("nop"); asm("nop");

asm("nop");asm("nop");asm("nop"); asm("nop");

asm("nop");asm("nop");asm("nop"); asm("nop");

asm("nop");asm("nop");asm("nop"); asm("nop");

asm("nop");asm("nop");asm("nop"); asm("nop");

asm("nop");asm("nop");asm("nop"); asm("nop");

asm("nop");asm("nop");asm("nop"); asm("nop");

asm("nop");asm("nop");asm("nop"); asm("nop");

asm("nop");asm("nop");asm("nop"); asm("nop");

asm("nop");asm("nop");asm("nop"); asm("nop");

asm("nop");asm("nop");asm("nop"); asm("nop");

asm("nop");asm("nop");asm("nop"); asm("nop");

asm("nop");asm("nop");asm("nop"); asm("nop");

asm("nop");asm("nop");asm("nop"); asm("nop");

asm("nop");asm("nop");asm("nop"); asm("nop");

asm("nop");asm("nop");asm("nop"); asm("nop")

void IIC_Init(void);

void IIC_Start(void);

void IIC_Stop(void);

void IIC_Send_Byte(uint8_t data);

void DelayMs(uint32_t msDelay );

void DelayUs(uint32_t usDelay );

2.iic.c文件

#include "iic.h"

void IIC_Start(void)//產生啟動時序

{

IIC_SCL(0);

DelayUs(2);

IIC_SDA_OUT(1);

DelayUs(2);

IIC_SCL(1);

DelayUs(2);

IIC_SDA_OUT(0);

DelayUs(2);

IIC_SCL(0);

DelayUs(2);

}

void IIC_Stop(void)//產生停止時序

{

IIC_SCL(0);

DelayUs(2);

IIC_SDA_OUT(0);

DelayUs(2);

IIC_SCL(1);

DelayUs(2);

IIC_SDA_OUT(1);

DelayUs(2);

}

3.oled.c:OLED初始化與驅動程序

void OLED_Write_CMD(uint8_t oled_cmd)//寫命令函數(shù)

{

IIC_Start();

IIC_Send_Byte(0x78);//模塊地址

IIC_SCL(0);

DelayUs(2);

IIC_SCL(1);

DelayUs(2);

IIC_SCL(0);

DelayUs(2);//跳過應答位

IIC_Send_Byte(0x00);//寫命令

IIC_SCL(0);

DelayUs(2);

IIC_SCL(1);

DelayUs(2);

IIC_SCL(0);

DelayUs(2);//跳過應答位

IIC_Send_Byte(oled_cmd);//命令值

IIC_Stop();

}

4.app.c:顯示“1234”.

#include "app.h"

#include "oled.h"

#include "iic.h"

#include "bsp.h"

APP_DATA appData;

void APP_Initialize ( void )

{

appData.state = APP_STATE_INIT;

}

void APP_Tasks ( void )

{

switch ( appData.state )

{

case APP_STATE_INIT:

{

DelayMs(100);

OLED_Init();

OLED_Clear();

appData.state = APP_STATE_SERVICE_TASKS;

break;

}

case APP_STATE_SERVICE_TASKS:

{

OLED_Show_Char0816((16 + 1), 0,0); //"1"

OLED_Show_Char0816((16 + 2), 0,8); //"2"

OLED_Show_Char0816((16 + 3), 0,16);//"3"

OLED_Show_Char0816((16 + 4), 0,24);//"4"

DelayMs(1000);

break;

}

}

}

5.顯示效果