基于DSP28377D的OLED驱动代码（4角，软件I2C，移植江协科技）

基于DSP28377D的OLED驱动代码（4角，软件I2C，移植江协科技）

在做项目时发现硬件工程师给485接收发送引脚画错了，所以想着用OLED显示屏显示数据，在移植过程中，我发现直接拿来没法用，会花屏或者直接不显示，查资料发现是数据发送太快导致，由于28377D单片机主频为200M，数据发送较快，OLED反应不过来，可以给I2C发送函数加一些延迟，代码如下，参考江协科技OLED。

第一步：SCI，SDA初始化

`//oled

GPIO_SetupPinOptions(42, GPIO_OUTPUT, GPIO_PUSHPULL);//SCL
GPIO_SetupPinMux(42, GPIO_MUX_CPU1, 0);
GPIO_SetupPinOptions(43, GPIO_OUTPUT, GPIO_PUSHPULL);//SDA
GPIO_SetupPinMux(43, GPIO_MUX_CPU1, 0);`

##第二步：移植代码

移植OLED.ｈ，OLED.c，OLED_Font.h的代码

并做了以下修改

2.1 //OLED.c

主要对#define OLED_W_SCL(x)，#define OLED_W_SDA(x)的格式进行了修改，改为CCS支持的格式，并在void OLED_I2C_SendByte(unsigned char Byte)发送数据后进行延迟

`#include "F28x_Project.h"     // Device Headerfile and Examples Include File`
`#include "F2837xD_Ipc_drivers.h"`
`#include "OLED_Font.h"`

`/*引脚配置*/`
`#define OLED_W_SCL(x)    (x ? (GpioDataRegs.GPBSET.bit.GPIO42 = 1) : (GpioDataRegs.GPBCLEAR.bit.GPIO42 = 1))`
`#define OLED_W_SDA(x)    (x ? (GpioDataRegs.GPBSET.bit.GPIO43 = 1) : (GpioDataRegs.GPBCLEAR.bit.GPIO43 = 1))`


`/*引脚初始化*/`
`void OLED_I2C_Init(void)`
`{`
    `OLED_W_SCL(1);DELAY_US(1);`
    `OLED_W_SDA(1);DELAY_US(1);`
`}`

`/**`
  * `@brief  I2C开始`
  * `@param  无`
  * `@retval 无`
    `*/`
    `void OLED_I2C_Start(void)`
    `{`
    `OLED_W_SDA(1);DELAY_US(1);`
    `OLED_W_SCL(1);DELAY_US(1);`
    `OLED_W_SDA(0);DELAY_US(1);`
    `OLED_W_SCL(0);DELAY_US(1);`
    `}`

`/**`
  * `@brief  I2C停止`
  * `@param  无`
  * `@retval 无`
    `*/`
    `void OLED_I2C_Stop(void)`
    `{`
    `OLED_W_SDA(0);DELAY_US(1);`
    `OLED_W_SCL(1);DELAY_US(1);`
    `OLED_W_SDA(1);DELAY_US(1);`
    `}`

`/**`
  * `@brief  I2C发送一个字节`
  * `@param  Byte 要发送的一个字节`
  * `@retval 无`
    `*/`
    `void OLED_I2C_SendByte(unsigned char Byte)`
    `{`
    `unsigned char i;`
    `for (i = 0; i < 8; i++)`
    `{`
        `OLED_W_SDA(Byte & (0x80 >> i));`
        `DELAY_US(1);`
        `OLED_W_SCL(1);`
        `DELAY_US(1);`
        `OLED_W_SCL(0);`
        `DELAY_US(1);`
    `}`
    `OLED_W_SCL(1);DELAY_US(1);  //额外的一个时钟，不处理应答信号`
    `OLED_W_SCL(0);DELAY_US(1);`
    `}`

`/**`

  * `@brief  OLED写命令`
  * `@param  Command 要写入的命令`
  * `@retval 无`
    `*/`
    `void OLED_WriteCommand(unsigned char Command)`
    `{`
    `OLED_I2C_Start();`
    `OLED_I2C_SendByte(0x78);        //从机地址`
    `OLED_I2C_SendByte(0x00);        //写命令`
    `OLED_I2C_SendByte(Command);`
    `OLED_I2C_Stop();`
    `}`

`/**`
  * `@brief  OLED写数据`
  * `@param  Data 要写入的数据`
  * `@retval 无`
    `*/`
    `void OLED_WriteData(unsigned char Data)`
    `{`
    `OLED_I2C_Start();`
    `OLED_I2C_SendByte(0x78);        //从机地址`
    `OLED_I2C_SendByte(0x40);        //写数据`
    `OLED_I2C_SendByte(Data);`
    `OLED_I2C_Stop();`
    `}`

`/**`
  * `@brief  OLED设置光标位置`
  * `@param  Y 以左上角为原点，向下方向的坐标，范围：0~7`
  * `@param  X 以左上角为原点，向右方向的坐标，范围：0~127`
  * `@retval 无`
    `*/`
    `void OLED_SetCursor(unsigned char Y, unsigned char X)`
    `{`
    `OLED_WriteCommand(0xB0 | Y);                    //设置Y位置`
    `OLED_WriteCommand(0x10 | ((X & 0xF0) >> 4));    //设置X位置低4位`
    `OLED_WriteCommand(0x00 | (X & 0x0F));           //设置X位置高4位`
    `}`

`/**`
  * `@brief  OLED清屏`
  * `@param  无`
  * `@retval 无`
    `*/`
    `void OLED_Clear(void)`
    `{`
    `unsigned char i, j;`
    `for (j = 0; j < 8; j++)`
    `{`
        `OLED_SetCursor(j, 0);`
        `for(i = 0; i < 128; i++)`
        `{`
            `OLED_WriteData(0x00);`
        `}`
    `}`
    `}`

`/**`
  * `@brief  OLED显示一个字符`
  * `@param  Line 行位置，范围：1~4`
  * `@param  Column 列位置，范围：1~16`
  * `@param  Char 要显示的一个字符，范围：ASCII可见字符`
  * `@retval 无`
    `*/`
    `void OLED_ShowChar(unsigned char Line, unsigned char Column, char Char)`
    `{`
    `unsigned char i;`
    `OLED_SetCursor((Line - 1) * 2, (Column - 1) * 8);       //设置光标位置在上半部分`
    `for (i = 0; i < 8; i++)`
    `{`
        `OLED_WriteData(OLED_F8x16[Char - ' '][i]);          //显示上半部分内容`
    `}`
    `OLED_SetCursor((Line - 1) * 2 + 1, (Column - 1) * 8);   //设置光标位置在下半部分`
    `for (i = 0; i < 8; i++)`
    `{`
        `OLED_WriteData(OLED_F8x16[Char - ' '][i + 8]);      //显示下半部分内容`
    `}`
    `}`

`/**`
  * `@brief  OLED显示字符串`
  * `@param  Line 起始行位置，范围：1~4`
  * `@param  Column 起始列位置，范围：1~16`
  * `@param  String 要显示的字符串，范围：ASCII可见字符`
  * `@retval 无`
    `*/`
    `void OLED_ShowString(unsigned char Line, unsigned char Column, char *String)`
    `{`
    `unsigned char i;`
    `for (i = 0; String[i] != '\0'; i++)`
    `{`
        `OLED_ShowChar(Line, Column + i, String[i]);`
    `}`
    `}`

`/**`
  * `@brief  OLED次方函数`
  * `@retval 返回值等于X的Y次方`
    `*/`
    `uint32_t OLED_Pow(uint32_t X, uint32_t Y)`
    `{`
    `uint32_t Result = 1;`
    `while (Y--)`
    `{`
        `Result *= X;`
    `}`
    `return Result;`
    `}`

`/**`
  * `@brief  OLED显示数字（十进制，正数）`
  * `@param  Line 起始行位置，范围：1~4`
  * `@param  Column 起始列位置，范围：1~16`
  * `@param  Number 要显示的数字，范围：0~4294967295`
  * `@param  Length 要显示数字的长度，范围：1~10`
  * `@retval 无`
    `*/`
    `void OLED_ShowNum(unsigned char Line, unsigned char Column, unsigned int Number, unsigned char Length)`
    `{`
    `unsigned char i;`
    `for (i = 0; i < Length; i++)`
    `{`
        `OLED_ShowChar(Line, Column + i, Number / OLED_Pow(10, Length - i - 1) % 10 + '0');`
    `}`
    `}`

`/**`
  * `@brief  OLED显示数字（十进制，带符号数）`
  * `@param  Line 起始行位置，范围：1~4`
  * `@param  Column 起始列位置，范围：1~16`
  * `@param  Number 要显示的数字，范围：-2147483648~2147483647`
  * `@param  Length 要显示数字的长度，范围：1~10`
  * `@retval 无`
    `*/`
    `void OLED_ShowSignedNum(unsigned char Line, unsigned char Column, int Number, unsigned char Length)`
    `{`
    `unsigned char i;`
    `unsigned int Number1;`
    `if (Number >= 0)`
    `{`
        `OLED_ShowChar(Line, Column, '+');`
        `Number1 = Number;`
    `}`
    `else`
    `{`
        `OLED_ShowChar(Line, Column, '-');`
        `Number1 = -Number;`
    `}`
    `for (i = 0; i < Length; i++)`
    `{`
        `OLED_ShowChar(Line, Column + i + 1, Number1 / OLED_Pow(10, Length - i - 1) % 10 + '0');`
    `}`
    `}`

`/**`
  * `@brief  OLED显示数字（十六进制，正数）`
  * `@param  Line 起始行位置，范围：1~4`
  * `@param  Column 起始列位置，范围：1~16`
  * `@param  Number 要显示的数字，范围：0~0xFFFFFFFF`
  * `@param  Length 要显示数字的长度，范围：1~8`
  * `@retval 无`
    `*/`
    `void OLED_ShowHexNum(unsigned char Line, unsigned char Column, unsigned int Number, unsigned char Length)`
    `{`
    `unsigned char i, SingleNumber;`
    `for (i = 0; i < Length; i++)`
    `{`
        `SingleNumber = Number / OLED_Pow(16, Length - i - 1) % 16;`
        `if (SingleNumber < 10)`
        `{`
            `OLED_ShowChar(Line, Column + i, SingleNumber + '0');`
        `}`
        `else`
        `{`
            `OLED_ShowChar(Line, Column + i, SingleNumber - 10 + 'A');`
        `}`
    `}`
    `}`

`/**`
  * `@brief  OLED显示数字（二进制，正数）`
  * `@param  Line 起始行位置，范围：1~4`
  * `@param  Column 起始列位置，范围：1~16`
  * `@param  Number 要显示的数字，范围：0~1111 1111 1111 1111`
  * `@param  Length 要显示数字的长度，范围：1~16`
  * `@retval 无`
    `*/`
    `void OLED_ShowBinNum(unsigned char Line, unsigned char Column, unsigned int Number, unsigned char Length)`
    `{`
    `unsigned char i;`
    `for (i = 0; i < Length; i++)`
    `{`
        `OLED_ShowChar(Line, Column + i, Number / OLED_Pow(2, Length - i - 1) % 2 + '0');`
    `}`
    `}`

`/**`
  * `@brief  OLED初始化`
  * `@param  无`
  * `@retval 无`
    `*/`
    `void OLED_Init(void)`
    `{`
    `unsigned int i, j;`

    `for (i = 0; i < 1000; i++)          //上电延时`
    `{`
        `for (j = 0; j < 1000; j++);`
    `}`

    `OLED_I2C_Init();            //端口初始化`

    `OLED_WriteCommand(0xAE);    //关闭显示`

    `OLED_WriteCommand(0xD5);    //设置显示时钟分频比/振荡器频率`
    `OLED_WriteCommand(0x80);`

    `OLED_WriteCommand(0xA8);    //设置多路复用率`
    `OLED_WriteCommand(0x3F);`

    `OLED_WriteCommand(0xD3);    //设置显示偏移`
    `OLED_WriteCommand(0x00);`

    `OLED_WriteCommand(0x40);    //设置显示开始行`

    `OLED_WriteCommand(0xA1);    //设置左右方向，0xA1正常 0xA0左右反置`

    `OLED_WriteCommand(0xC8);    //设置上下方向，0xC8正常 0xC0上下反置`

    `OLED_WriteCommand(0xDA);    //设置COM引脚硬件配置`
    `OLED_WriteCommand(0x12);`

    `OLED_WriteCommand(0x81);    //设置对比度控制`
    `OLED_WriteCommand(0xCF);`

    `OLED_WriteCommand(0xD9);    //设置预充电周期`
    `OLED_WriteCommand(0xF1);`

    `OLED_WriteCommand(0xDB);    //设置VCOMH取消选择级别`
    `OLED_WriteCommand(0x30);`

    `OLED_WriteCommand(0xA4);    //设置整个显示打开/关闭`

    `OLED_WriteCommand(0xA6);    //设置正常/倒转显示`

    `OLED_WriteCommand(0x8D);    //设置充电泵`
    `OLED_WriteCommand(0x14);`

    `OLED_WriteCommand(0xAF);    //开启显示`

    `OLED_Clear();               //OLED清屏`
    `}`

2.2 //OLED.h

`#ifndef HARDWARE_OLED_H_`

`#define HARDWARE_OLED_H_`

`void OLED_Init(void);`
`void OLED_Clear(void);`
`void OLED_ShowChar(unsigned char Line, unsigned char Column, char Char);`
`void OLED_ShowString(unsigned char Line, unsigned char Column, char *String);`
`void OLED_ShowNum(unsigned char Line, unsigned char Column, unsigned int Number, unsigned char Length);`
`void OLED_ShowSignedNum(unsigned char Line, unsigned char Column, int Number, unsigned char Length);`
`void OLED_ShowHexNum(unsigned char Line, unsigned char Column, unsigned int Number, unsigned char Length);`
`void OLED_ShowBinNum(unsigned char Line, unsigned char Column, unsigned int Number, unsigned char Length);`

`#endif /* HARDWARE_OLED_H_ */`

##第三步，在主函数进行初始化，就可以使用了

`OLED_Init();`