28035spi驱动OLED

犯了几个小错误后，终于成功刷屏了。下面说下具体步骤。

首先说下OLED的类型。128*160，ST7735，采用的通信方式为4线串行，即CS，D/CX，SDA，SCL。

1、配置Gpio

使用Gpio10-CS，Gpio11-D/CX，Gpio16-SDA，Gpio18-SCL，代码如下：

void Gpio_init()

{

EALLOW;
// Enable SPI-A on GPIO16 、 GPIO18
   GpioCtrlRegs.GPAPUD.bit.GPIO16 = 0;   // Enable pullup on GPIO16
      GpioCtrlRegs.GPAPUD.bit.GPIO18 = 0;   // Enable pullup on GPIO18

   GpioCtrlRegs.GPAQSEL2.bit.GPIO16 = 3; // asynch input
      GpioCtrlRegs.GPAQSEL2.bit.GPIO18 = 3; // asynch input

   GpioCtrlRegs.GPAMUX2.bit.GPIO16 = 1; // GPIO16 = SPISIMOA
      GpioCtrlRegs.GPAMUX2.bit.GPIO18 = 1; // GPIO18 = SPICLKA

//CS

GpioCtrlRegs.GPAPUD.bit.GPIO10 = 0;   // Enable pullup on GPIO10
   GpioCtrlRegs.GPAMUX1.bit.GPIO10 = 0; // GPIO10 = GPIO10
   GpioCtrlRegs.GPADIR.bit.GPIO10 = 1;   // GPIO10 = output

//Enable GPIO11，register choose ，low command，high data
   GpioCtrlRegs.GPAPUD.bit.GPIO11 = 0;   // Enable pullup on GPIO11
   GpioCtrlRegs.GPAMUX1.bit.GPIO11 = 0; // GPIO11 = GPIO11
   GpioCtrlRegs.GPADIR.bit.GPIO11 = 1;   // GPIO10 = output

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EDIS;

}

2、Initialize SPIA

由于使用的是标准spi，所以SPIFFTX，SPIFFRX和SPIFFCT可以不管。对于spi来说，是要配置以下参数

a、master or slaver

b、上升沿或下降沿发送数据

c、相位和极性

d、发送使能，中断使能

e、baud rate

这里我选用的是master模式，Rising edge with delay，发送使能，中断禁止，baud rate=lspclk/4，代码如下：

void spi_init()
{
SpiaRegs.SPICCR.all =0x0007;              // Reset on, rising edge, 16-bit char bits
SpiaRegs.SPICTL.all =0x000e;           // Enable master mode, normal phase,
                                                 // enable talk, and SPI int disabled.
SpiaRegs.SPIBRR =0x0001;
    SpiaRegs.SPICCR.all =0x0087;           // Relinquish SPI from Reset
    SpiaRegs.SPIPRI.bit.FREE = 1;                // Set so breakpoints don't disturb xmission
}

3、接下来是LedInit

这部分代码较长，主要是复位，刷新率，以及Power和Gamma的一些设置：

void Lcd_init()
{
LcdCommandWrite(0x11);//Sleep out
DELAY_US(100000);

//ST7735R Frame Rate
LcdCommandWrite(0xB1);
LcdDataWrite(0x01);
LcdDataWrite(0x2C);
LcdDataWrite(0x2D);

LcdCommandWrite(0xB2);
LcdDataWrite(0x01);
LcdDataWrite(0x2C);
LcdDataWrite(0x2D);

LcdCommandWrite(0xB3);
LcdDataWrite(0x01);
LcdDataWrite(0x2C);
LcdDataWrite(0x2D);

LcdDataWrite(0x01);
LcdDataWrite(0x2C);
LcdDataWrite(0x2D);
//------------------End ST7735R Frame Rate----------------//

LcdCommandWrite(0xB4);//Column inversion
LcdDataWrite(0x07);

//-------------------ST7735R Power Sequence-----------------//
LcdCommandWrite(0xC0);
LcdDataWrite(0xA2);
LcdDataWrite(0x02);
LcdDataWrite(0x84);

LcdCommandWrite(0xC1);
LcdDataWrite(0xC5);

LcdCommandWrite(0xC2);
LcdDataWrite(0x0A);
LcdDataWrite(0x00);

LcdCommandWrite(0xC3);
LcdDataWrite(0x8A);
LcdDataWrite(0x2A);

LcdCommandWrite(0xC4);
LcdDataWrite(0x8A);
LcdDataWrite(0xEE);
//------------End ST7735R Power Sequence-------------------//

LcdCommandWrite(0xC5);//VCOM
LcdDataWrite(0x0E);
LcdCommandWrite(0x36);//MX, MY, RGB Mode
LcdDataWrite(0xC8);

//-----------------ST7735R Gamma Sequence------------------//
LcdCommandWrite(0xE0);
LcdDataWrite(0x02);
LcdDataWrite(0x1C);
LcdDataWrite(0x07);
LcdDataWrite(0x12);
LcdDataWrite(0x37);
LcdDataWrite(0x32);
LcdDataWrite(0x29);
LcdDataWrite(0x2D);
LcdDataWrite(0x29);
LcdDataWrite(0x25);
LcdDataWrite(0x2B);
LcdDataWrite(0x39);
LcdDataWrite(0x00);
LcdDataWrite(0x01);
LcdDataWrite(0x03);
LcdDataWrite(0x10);

LcdCommandWrite(0xE1);
LcdDataWrite(0x03);
LcdDataWrite(0x1D);
LcdDataWrite(0x07);
LcdDataWrite(0x06);
LcdDataWrite(0x2E);
LcdDataWrite(0x2C);
LcdDataWrite(0x29);
LcdDataWrite(0x2D);
LcdDataWrite(0x2E);
LcdDataWrite(0x2E);
LcdDataWrite(0x37);
LcdDataWrite(0x3F);
LcdDataWrite(0x00);
LcdDataWrite(0x00);
LcdDataWrite(0x02);
LcdDataWrite(0x10);

LcdCommandWrite(0x2A);
LcdDataWrite(0x00);
LcdDataWrite(0x02);
LcdDataWrite(0x00);
LcdDataWrite(0x81);

LcdCommandWrite(0x2B);
LcdDataWrite(0x00);
LcdDataWrite(0x01);
LcdDataWrite(0x00);
LcdDataWrite(0xA0);
//----------------------End ST7735R Gamma Sequence------------//

LcdCommandWrite(0x3A);
LcdDataWrite(0x05);
//write_command(0x3A);//65k mode
//write_data(0x05);
LcdCommandWrite(0x29);
}

4、这部分主要是操作屏幕的4个函数：

void spi_xmit(uchar a);

void LcdDataWrite(uchar a);

void LcdCommandWrite(uchar a);

void dsp_single_colour(uchar a, uchar b);

void spi_xmit(uchar a)
{

    SpiaRegs.SPITXBUF=(a<<8);
    while(SpiaRegs.SPISTS.bit.INT_FLAG !=1) { }
    dummy = SpiaRegs.SPIRXBUF;
    //DELAY_US(1);
}

void LcdDataWrite(uchar a)
{
GpioDataRegs.GPACLEAR.bit.GPIO10 = 1;   // Load output latch/Lcd cs enable
GpioDataRegs.GPASET.bit.GPIO11 = 1;   // Load output latch/register choose data
spi_xmit(a);
GpioDataRegs.GPASET.bit.GPIO10 = 1;   // Load output latch/Lcd cs disable
}

void LcdCommandWrite(uchar a)
{
GpioDataRegs.GPACLEAR.bit.GPIO10 = 1;   // Load output latch/Lcd cs enable
GpioDataRegs.GPACLEAR.bit.GPIO11 = 1;   // Load output latch/register choose command
spi_xmit(a);
GpioDataRegs.GPASET.bit.GPIO10 = 1;   // Load output latch/Lcd cs disable
}

void dsp_single_colour(uchar a, uchar b)
{
uchar i,j;
//RamAdressSet();
for (i=0;i<160;i++)
    for (j=0;j<128;j++)
    {
        LcdDataWrite(a);
        LcdDataWrite(b);
    }
}

5、最后就是main()了：

int main()

{

……

void Gpio_init();

void spi_init();

void Lcd_init();

LcdCommandWrite(0x2c);

for(;;)

{

    dsp_single_colour(0xff,0xff);//white
    DELAY_US(500000);

    dsp_single_colour(0x00,0x00);//black
    DELAY_US(500000);

    dsp_single_colour(0xf8,0x00);//red
    DELAY_US(500000);

    dsp_single_colour(0x07,0xe0);//green
    DELAY_US(500000);

    dsp_single_colour(0x00,0x1f);//blue
    DELAY_US(500000);

}

return 0;

}

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