SPI SPI

使用RT-Thread studio开启SPI框架驱动OLED

发布于 2021-09-08 10:46:14 浏览：1606 订阅该版

想学习使用SPI框架驱动OLED，就准备把中景园的程序移植到RTT上，参考了网上的步骤，在settings里开启spi，在board.c里复制HAL_SPI_MspInit，在board.h和stm32xxxx_hal_config.h里开启了spi，然后代码如下：

```c
/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2021-09-07     Administrator       the first version
 */

#include "OLED.h"

#define SPI_BUS_NAME                "spi1"
#define SPI_SSD1306_DEVICE_NAME     "spi10"
#define RES_PIN  11
#define DC_PIN   12
#define CS_PIN   15
uint8_t OLED_GRAM[128][8];

static struct rt_spi_device* spi_dev_ssd1306; /* SPI设备ssd1306对象 */

int oled_spi_device_init(void)
{
    __HAL_RCC_GPIOA_CLK_ENABLE();
    //设备挂载到SPI总线，抽象为 spi10 设备，同时使用时还需进行 rt_spi_configure
    rt_hw_spi_device_attach("spi1", "spi10", GPIOA, GPIO_PIN_15);
    return RT_EOK;
}
INIT_DEVICE_EXPORT(oled_spi_device_init);//自动初始化

int  my_oled_init(void)
{
    rt_pin_mode(RES_PIN, PIN_MODE_OUTPUT );
    rt_pin_mode(DC_PIN, PIN_MODE_OUTPUT );
    rt_pin_mode(CS_PIN, PIN_MODE_OUTPUT );

spi_dev_ssd1306 = (struct rt_spi_device *)rt_device_find("spi10");
    if (!spi_dev_ssd1306)
    {
        rt_kprintf("spi sample run failed! can't find %s device!\n", "spi10");
    }
    else
    {
        // owner必须配置,因为默认为空,为空时无法进行初始化操作
        spi_dev_ssd1306->bus->owner = spi_dev_ssd1306; // 必须!!!

// 配置spi
        struct rt_spi_configuration cfg;
        cfg.data_width = 8;
        cfg.mode = RT_SPI_MASTER | RT_SPI_MODE_3 | RT_SPI_MSB;  // 主机,模式0,高位在前
        cfg.max_hz = 20 * 1000 * 1000; // SPI 接口时钟频率
        rt_spi_configure(spi_dev_ssd1306, &cfg); // 此时才进行MspInit相关的时钟及IO口初始化
    }
    OLED_Init();
    return RT_EOK;
}

//OLED写一个字节
void OLED_WR_Byte(uint8_t dat, uint8_t cmd)
{
    if(cmd)
    {
        OLED_DC_Set();
    }else{
        OLED_DC_Clr();
    }
    rt_spi_send(spi_dev_ssd1306, &dat, 1);
    OLED_DC_Set();
}

//开启OLED显示
void OLED_DisPlay_On(void)
{
    OLED_WR_Byte(0x8D,OLED_CMD);//电荷泵使能
    OLED_WR_Byte(0x14,OLED_CMD);//开启电荷泵
    OLED_WR_Byte(0xAF,OLED_CMD);//点亮屏幕
}

//关闭OLED显示
void OLED_DisPlay_Off(void)
{
    OLED_WR_Byte(0x8D,OLED_CMD);//电荷泵使能
    OLED_WR_Byte(0x10,OLED_CMD);//关闭电荷泵
    OLED_WR_Byte(0xAF,OLED_CMD);//关闭屏幕
}

//更新显存到OLED
void OLED_Refresh(void)
{
    uint8_t i,n;
    for(i=0;i<8;i++)
    {
       OLED_WR_Byte(0xb0+i,OLED_CMD); //设置行起始地址
       OLED_WR_Byte(0x00,OLED_CMD);   //设置低列起始地址
       OLED_WR_Byte(0x10,OLED_CMD);   //设置高列起始地址
       for(n=0;n<128;n++)
           OLED_WR_Byte(OLED_GRAM[n][i],OLED_DATA);
  }
}

//清屏函数
void OLED_Clear(void)
{
    uint8_t i,n;
    for(i=0;i<8;i++)
    {
        for(n=0;n<128;n++)
        {
            OLED_GRAM[n][i]=0;//清除所有数据
        }
    }
    OLED_Refresh();//更新显示
}

//画点
//x:0~127
//y:0~63
void OLED_DrawPoint(uint8_t x,uint8_t y)
{
    uint8_t i,m,n;
    i=y/8;
    m=y%8;
    n=1<<m;
    OLED_GRAM[x][i]|=n;
}

//清除一个点
//x:0~127
//y:0~63
void OLED_ClearPoint(uint8_t x,uint8_t y)
{
    uint8_t i,m,n;
    i=y/8;
    m=y%8;
    n=1<<m;
    OLED_GRAM[x][i]=~OLED_GRAM[x][i];
    OLED_GRAM[x][i]|=n;
    OLED_GRAM[x][i]=~OLED_GRAM[x][i];
}

void OLED_DrawCircle(uint8_t x,uint8_t y,uint8_t r)
{
    int a, b,num;
    a = 0;
    b = r;
    while(2 * b * b >= r * r)
    {
        OLED_DrawPoint(x + a, y - b);
        OLED_DrawPoint(x - a, y - b);
        OLED_DrawPoint(x - a, y + b);
        OLED_DrawPoint(x + a, y + b);

OLED_DrawPoint(x + b, y + a);
        OLED_DrawPoint(x + b, y - a);
        OLED_DrawPoint(x - b, y - a);
        OLED_DrawPoint(x - b, y + a);

a++;
        num = (a * a + b * b) - r*r;//计算画的点离圆心的距离
        if(num > 0)
        {
            b--;
            a--;
        }
    }
}

//OLED的初始化
void OLED_Init(void)
{
    OLED_RES_Clr();
    rt_thread_delay(200);
    OLED_RES_Set();

OLED_WR_Byte(0xAE,OLED_CMD);//--turn off oled panel
    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  Set Mapping RAM Display Start Line (0x00~0x3F)
    OLED_WR_Byte(0x81,OLED_CMD);//--set contrast control register
    OLED_WR_Byte(0xCF,OLED_CMD);// Set SEG Output Current Brightness
    OLED_WR_Byte(0xA1,OLED_CMD);//--Set SEG/Column Mapping     0xa0左右反置 0xa1正常
    OLED_WR_Byte(0xC8,OLED_CMD);//Set COM/Row Scan Direction   0xc0上下反置 0xc8正常
    OLED_WR_Byte(0xA6,OLED_CMD);//--set normal display
    OLED_WR_Byte(0xA8,OLED_CMD);//--set multiplex ratio(1 to 64)
    OLED_WR_Byte(0x3f,OLED_CMD);//--1/64 duty
    OLED_WR_Byte(0xD3,OLED_CMD);//-set display offset   Shift Mapping RAM Counter (0x00~0x3F)
    OLED_WR_Byte(0x00,OLED_CMD);//-not offset
    OLED_WR_Byte(0xd5,OLED_CMD);//--set display clock divide ratio/oscillator frequency
    OLED_WR_Byte(0x80,OLED_CMD);//--set divide ratio, Set Clock as 100 Frames/Sec
    OLED_WR_Byte(0xD9,OLED_CMD);//--set pre-charge period
    OLED_WR_Byte(0xF1,OLED_CMD);//Set Pre-Charge as 15 Clocks & Discharge as 1 Clock
    OLED_WR_Byte(0xDA,OLED_CMD);//--set com pins hardware configuration
    OLED_WR_Byte(0x12,OLED_CMD);
    OLED_WR_Byte(0xDB,OLED_CMD);//--set vcomh
    OLED_WR_Byte(0x40,OLED_CMD);//Set VCOM Deselect Level
    OLED_WR_Byte(0x20,OLED_CMD);//-Set Page Addressing Mode (0x00/0x01/0x02)
    OLED_WR_Byte(0x02,OLED_CMD);//
    OLED_WR_Byte(0x8D,OLED_CMD);//--set Charge Pump enable/disable
    OLED_WR_Byte(0x14,OLED_CMD);//--set(0x10) disable
    OLED_WR_Byte(0xA4,OLED_CMD);// Disable Entire Display On (0xa4/0xa5)
    OLED_WR_Byte(0xA6,OLED_CMD);// Disable Inverse Display On (0xa6/a7)
    OLED_WR_Byte(0xAF,OLED_CMD);
    OLED_Clear();
    OLED_DrawCircle(50, 50, 20);
    OLED_Refresh();
}

```

在OLED_Init最后想画个点测试是否成功，但是屏幕没有点亮，msh里输入list_device可以看见spi1和spi10是正常开启的，请问是哪个步骤做错了吗

1 个回答

jiao96 2021-09-08

这家伙很懒，什么也没写！

拿着个试试
```c
/*
 * Copyright (c) 2014-2019, Winning_technology
 *
 * SPDX-License-Identifier: None
 *
 * Change Logs:
 * Date           Author       Notes
 * 2019-07-19     Jiao        newly-built
 */
 /*
 * 程序清单：OLED屏幕底层驱动
*/

#include <rtdevice.h>
#include "oled_drv.h"
#include "stdlib.h"
#include <stdio.h>
#include <string.h>
#include "drv_spi.h"

#define OLED_DC_PIN          4  /* 数据控制脚 */

#define Max_Column	128
#define Max_Row		64
#define X_WIDTH 	128
#define Y_WIDTH 	64

//OLED控制用函数
struct rt_spi_device *spi_device = RT_NULL;

rt_uint8_t video_mem[8][128];   //显存，1K RAM空间

//屏幕命令
static void OLED_CMD(unsigned dat)
{
	struct rt_spi_message spi_msg;
	rt_pin_write(OLED_DC_PIN,PIN_LOW);
  rt_memset(&spi_msg, 0x00, sizeof(spi_msg));
  spi_msg.send_buf = &dat;
  spi_msg.length = 1;
  rt_spi_transfer_message(spi_device, &spi_msg);
	rt_pin_write(OLED_DC_PIN,PIN_LOW);
}

//开启OLED显示    
void OLED_Display_On(void)
{
	OLED_CMD(0X8D);  //SET DCDC命令
	OLED_CMD(0X14);  //DCDC ON
	OLED_CMD(0XAF);  //DISPLAY ON
}
//关闭OLED显示     
void OLED_Display_Off(void)
{
	OLED_CMD(0X8D);  //SET DCDC命令
	OLED_CMD(0X10);  //DCDC OFF
	OLED_CMD(0XAE);  //DISPLAY OFF
}

//刷屏，不刷不显示
void OLED_refresh(void)
{
	struct rt_spi_message spi_msg;
	rt_uint8_t i;		    
  rt_memset(&spi_msg, 0x00, sizeof(spi_msg));
	for(i=0;i<8;i++)  
	{
		OLED_CMD(0xB0+i);
		OLED_CMD(0x02);
		OLED_CMD(0x10);
		rt_pin_write(OLED_DC_PIN,PIN_HIGH);
		spi_msg.send_buf = video_mem[i];
		spi_msg.length = 128;
		rt_spi_transfer_message(spi_device, &spi_msg);
		rt_pin_write(OLED_DC_PIN,PIN_LOW);
	}
}

//清屏函数,清完屏,整个屏幕是黑色的!和没点亮一样!!!	  
void OLED_Clear(void)  
{  
	rt_uint8_t i,n;  
	for(i=0;i<8;i++)for(n=0;n<128;n++)video_mem[i][n]=0X00;  
//	OLED_refresh();//更新显示
}
//画点 
//x:0~127
//y:0~63
//t:1 填充 0,清空				   
void OLED_DrawPoint(rt_uint8_t x,rt_uint8_t y,rt_uint8_t t)
{
	rt_uint8_t pos,bx,temp=0;
	if(x>127||y>63)return;//超出范围了.
	pos=7-(y>>3);
	bx=y%8;
	temp=1<<(7-bx);
	if(t)video_mem[pos][x]|=temp;
	else video_mem[pos][x]&=~temp;	    
}

//x1,y1,x2,y2 填充区域的对角坐标
//确保x1<=x2;y1<=y2 0<=x1<=127 0<=y1<=63	 	 
//dot:0,清空;1,填充	  
void OLED_Fill(rt_uint8_t x1,rt_uint8_t y1,rt_uint8_t x2,rt_uint8_t y2,rt_uint8_t dot)  
{  
	rt_uint8_t x,y;  
	for(x=x1;x<=x2;x++)
	{
		for(y=y1;y<=y2;y++)OLED_DrawPoint(x,y,dot);
	}
	OLED_refresh();//更新显示
}

/*OLED spi驱动初始化*/
rt_err_t oled_drv_init(void)
{
	char *spi_dev_name="spi10";
	/* 输入模式 */
	rt_pin_mode(OLED_DC_PIN, PIN_MODE_OUTPUT);      //OLED_DC
	rt_pin_write(OLED_DC_PIN,PIN_LOW);
	
	rt_hw_spi_device_attach("spi1",spi_dev_name,GPIOA,GPIO_PIN_12);
	if (spi_device != RT_NULL)
	{
		return 0;
	}

spi_device = (struct rt_spi_device *) rt_device_find(spi_dev_name);
	if (spi_device == RT_NULL)
	{
		rt_kprintf("SPI device %s not found!", spi_dev_name);
		return -RT_ENOSYS;
	}

/* check SPI device type */
	RT_ASSERT(spi_device->parent.type == RT_Device_Class_SPIDevice);

/* configure SPI device*/
	{
		struct rt_spi_configuration cfg;
		cfg.data_width = 8;
		cfg.mode = RT_SPI_MASTER | RT_SPI_MODE_0 | RT_SPI_MSB;  /* SPI Compatible Modes 0 */
		cfg.max_hz = 8 * 1000 * 1000;                          /* SPI Interface with Clock Speeds Up to 8 MHz */
		rt_spi_configure(spi_device, &cfg);
	}

if (rt_device_open((rt_device_t) spi_device, RT_DEVICE_OFLAG_WRONLY) != RT_EOK)
	{
		rt_kprintf("open SPI device %s error.", spi_dev_name);
		return -RT_ERROR;
	}
	return RT_EOK;
}

//显示初始化
void Display_Init(void)
{
	oled_drv_init();
	rt_thread_mdelay(300);

OLED_CMD(0xAE); //关闭显示
	OLED_CMD(0xD5); //设置时钟分频因子,震荡频率
	OLED_CMD(80);   //[3:0],分频因子;[7:4],震荡频率
	OLED_CMD(0xA8); //设置驱动路数
	OLED_CMD(0X3F); //默认0X3F(1/64) 
	OLED_CMD(0xD3); //设置显示偏移
	OLED_CMD(0X00); //默认为0

OLED_CMD(0x40); //设置显示开始行 [5:0],行数.
													    
	OLED_CMD(0x8D); //电荷泵设置
	OLED_CMD(0x14); //bit2，开启/关闭
	OLED_CMD(0x20); //设置内存地址模式
	OLED_CMD(0x02); //[1:0],00，列地址模式;01，行地址模式;10,页地址模式;默认10;
	OLED_CMD(0xA1); //段重定义设置,bit0:0,0->0;1,0->127;
	OLED_CMD(0xC0); //设置COM扫描方向;bit3:0,普通模式;1,重定义模式 COM[N-1]->COM0;N:驱动路数
	OLED_CMD(0xDA); //设置COM硬件引脚配置
	OLED_CMD(0x12); //[5:4]配置
		 
	OLED_CMD(0x81); //对比度设置
	OLED_CMD(0xEF); //1~255;默认0X7F (亮度设置,越大越亮)
	OLED_CMD(0xD9); //设置预充电周期
	OLED_CMD(0xf1); //[3:0],PHASE 1;[7:4],PHASE 2;
	OLED_CMD(0xDB); //设置VCOMH 电压倍率
	OLED_CMD(0x30); //[6:4] 000,0.65*vcc;001,0.77*vcc;011,0.83*vcc;

OLED_CMD(0xA4); //全局显示开启;bit0:1,开启;0,关闭;(白屏/黑屏)
	OLED_CMD(0xA6); //设置显示方式;bit0:1,反相显示;0,正常显示	    						   
	OLED_CMD(0xAF); //开启显示	 
	OLED_Clear();
	OLED_refresh();
//	rt_thread_mdelay(2000);

}

```