10 K210 模拟SPI 无法挂载SD卡

发布于 2022-09-23 21:46:14 浏览：893 订阅该版

K210由于硬件只有一个可以用的SPI，所以想模拟一个。现在是SPI时序有点问题，逻辑分析仪也用上了，发现MISO数据一直是1  ，代码如下：

```c
/*
 * Change Logs:
 * Date           Author       Notes
 * 2022-09-19     xiaoyu     first version
 */

#include "board.h"
#if 1
#include <drv_soft_spi.h>
#include <gpiohs.h>
#include <fpioa.h>
#include <sleep.h>
#include "gpio.h"
#define DBG_TAG "softspi"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
static struct k210_soft_spi_config soft_spi_config[] ={
#ifdef BSP_USING_SOFT_SPI
    SOFT_SPI_BUS_CONFIG,
#endif
};

#define BSP_USING_SOFT_SPI
#define BSP_SOFT_SPI_CLK_PIN 27
#define BSP_SOFT_SPI_MOSI_PIN 28
#define BSP_SOFT_SPI_MISO_PIN 26
#define RT_USING_SOFT_SPI_CS0
#define RT_USING_SOFT_SPI_CS0_PIN 29

// #define SOFT_SPI_CS         (RT_USING_SOFT_SPI_CS0_PIN-FUNC_GPIOHS0)
// #define SOFT_SPI_SCLK       (BSP_SOFT_SPI_CLK_PIN-FUNC_GPIOHS0)
// #define SOFT_SPI_MOSI       (BSP_SOFT_SPI_MOSI_PIN-FUNC_GPIOHS0)
// #define SOFT_SPI_MISO       (BSP_SOFT_SPI_MISO_PIN-FUNC_GPIOHS0)

struct soft_spi_dev
{
    struct rt_spi_bus *spi_bus;
};

static struct soft_spi_dev *spi_dev;

static struct k210_soft_spi soft_spi_bus_obj[sizeof(soft_spi_config) / sizeof(soft_spi_config[0])] = {0};

/*设置从设备使能 */
static void soft_spi_cs_enable(int enable)
{
        if(enable)
    {
        gpiohs_set_pin(RT_USING_SOFT_SPI_CS0_PIN,GPIO_PV_LOW);
    }
    else
    {
        gpiohs_set_pin(RT_USING_SOFT_SPI_CS0_PIN,GPIO_PV_HIGH);
    }
}

static rt_err_t k210_spi_init()
{
   
    fpioa_set_function(RT_USING_SOFT_SPI_CS0_PIN,RT_USING_SOFT_SPI_CS0_PIN + FUNC_GPIOHS0);
    fpioa_set_function(BSP_SOFT_SPI_MOSI_PIN,BSP_SOFT_SPI_MOSI_PIN + FUNC_GPIOHS0);
    fpioa_set_function(BSP_SOFT_SPI_MISO_PIN,BSP_SOFT_SPI_MISO_PIN + FUNC_GPIOHS0);
    fpioa_set_function(BSP_SOFT_SPI_CLK_PIN,BSP_SOFT_SPI_CLK_PIN + FUNC_GPIOHS0);

gpiohs_set_drive_mode(BSP_SOFT_SPI_CLK_PIN, GPIO_DM_OUTPUT);
     gpiohs_set_drive_mode(BSP_SOFT_SPI_MOSI_PIN, GPIO_DM_OUTPUT);
     gpiohs_set_drive_mode(RT_USING_SOFT_SPI_CS0_PIN, GPIO_DM_OUTPUT);

gpiohs_set_drive_mode(BSP_SOFT_SPI_MISO_PIN,GPIO_DM_INPUT);

gpiohs_set_pin(BSP_SOFT_SPI_CLK_PIN, GPIO_PV_LOW);
     gpiohs_set_pin(RT_USING_SOFT_SPI_CS0_PIN, GPIO_PV_HIGH);

return RT_EOK;
}

static inline void spi_delay(uint8_t time)
{
    
}

void SPI_CLK (int data)
{
    if(data == 0)
    {
        gpiohs_set_pin(BSP_SOFT_SPI_CLK_PIN,GPIO_PV_LOW);
    }
    else
    {
        gpiohs_set_pin(BSP_SOFT_SPI_CLK_PIN,GPIO_PV_HIGH);
    }
}

void SPI_MOSI (int data)
{
     if(data == 0)
    {
        gpiohs_set_pin(BSP_SOFT_SPI_MOSI_PIN,GPIO_PV_LOW);
    }
    else
    {
        gpiohs_set_pin(BSP_SOFT_SPI_MOSI_PIN,GPIO_PV_HIGH);
    }

}

int SPI_MISO ()
{
    //rt_kprintf("SPI_MISO :%d\n\r", gpiohs_get_pin(BSP_SOFT_SPI_MISO_PIN));
    return gpiohs_get_pin(BSP_SOFT_SPI_MISO_PIN);
     
}

void SPI_Delay()
{
   usleep(10);
}

/* 写一个字节 */
static void soft_spi_WriteByte(uint8_t data)
{
    uint8_t i = 0;
uint8_t temp = 0;
for(i=0; i<8; i++) 
{
    temp = ((data&0x80)==0x80)? 1:0;
    data = data<<1;
    SPI_CLK(0); //CPOL=0
    SPI_Delay();
    SPI_MOSI(temp);
    SPI_Delay();
    SPI_CLK(1); //CPHA=0
    SPI_Delay();
 }
SPI_CLK(0); 
}

/* 读写一个字节 */
static uint8_t soft_spi_ReadWriteByte(uint8_t data)
{
    uint8_t i = 0;
    uint8_t temp = 0;
    uint8_t redata = 0xFF;
    SPI_Delay();
    for(i=0;i<8;i++)
    {
        
        if(data & 0x80)
		{
			SPI_MOSI(1);
		}
		else
		{
			SPI_MOSI(0);
		}
		data <<= 1;
        SPI_Delay();
		SPI_CLK(1);	
		redata<<=1;
		if(SPI_MISO())
		{
			redata++;	
		}
        SPI_Delay();
        SPI_CLK(0);

// temp = ((data&0x80)==0x80)? 1:0;
        // data = data<<1;
        // read_data = read_data<<1;
        // SPI_CLK(0);
        // SPI_Delay();
        // SPI_MOSI(temp);
        // SPI_Delay();
        // SPI_CLK(1);
        // SPI_Delay();
        // if(SPI_MISO()==1) 
        // {
        //     read_data = read_data + 1; 
        // } 
    }
    return redata;
}
rt_err_t _soft_spi_configure(struct rt_spi_device *dev,struct rt_spi_configuration *cfg)
{
    return RT_EOK;
}
/* 模拟 SPI 传输数据  */

rt_uint32_t _soft_spi_xfer(struct rt_spi_device* device, struct rt_spi_message* message)
{
   
    struct rt_spi_configuration * config = &device->config;
    rt_uint32_t size = message->length;
    /* 设置 CS  */
    if(message->cs_take)
    {
        soft_spi_cs_enable(1);

}
   
    const rt_uint8_t * send_ptr =  message->send_buf;
    rt_uint8_t * recv_ptr =  message->recv_buf;
    while(size--)
    {
        rt_uint8_t data = 0xFF;

if(send_ptr != RT_NULL)
        {
            data = *send_ptr++;
            //rt_kprintf("send_ptr:%02x\n",data);
             // 发送数据
            soft_spi_ReadWriteByte(data);
        }

// 接收数据
        if(recv_ptr != RT_NULL)
        {
             // 发送数据
            data = soft_spi_ReadWriteByte(data);
            *recv_ptr++ = data;
            //rt_kprintf("recv_ptr:%02x\n",data);
        }
    }
    /* 设置 release CS   */
    if(message->cs_release)
    {
        soft_spi_cs_enable(0);
    }
    //rt_kprintf("len=%d \n",message->length);
    return message->length;

}

static struct rt_spi_ops soft_spi_ops =
{
    .configure = _soft_spi_configure,
    .xfer = _soft_spi_xfer
};

int rt_soft_spi_bus_register(char *name)
{
    int result = RT_EOK;
    struct rt_spi_bus *spi_bus = RT_NULL;

if(spi_dev)
    {
       return RT_EOK;
    }

spi_dev = rt_malloc(sizeof(struct soft_spi_dev));
    if(!spi_dev)
    {
        rt_kprintf("[soft spi]:malloc memory for spi_dev failed\n");
        result = -RT_ENOMEM;
        goto _exit;
    }
    memset(spi_dev,0,sizeof(struct soft_spi_dev));

spi_bus = rt_malloc(sizeof(struct rt_spi_bus));
    if(!spi_bus)
    {
        rt_kprintf("[soft spi]:malloc memory for spi_bus failed\n");
        result = -RT_ENOMEM;
        goto _exit;
    }
    memset(spi_bus,0,sizeof(struct rt_spi_bus));

spi_bus->parent.user_data = spi_dev;
    rt_spi_bus_register(spi_bus, name, &soft_spi_ops);
   
    return result;

_exit:
    if (spi_dev)
    {
        rt_free(spi_dev);
        spi_dev = RT_NULL;
    }

if (spi_bus)
    {
        rt_free(spi_bus);
        spi_bus = RT_NULL;
    }
    return result;
}
static struct rt_spi_device *soft_spi_device = RT_NULL;

int rt_soft_spi_device_init(void)
{
    k210_spi_init();

int result = RT_EOK;

rt_kprintf("[soft spi]:rt_soft_spi_device_init \n");

if(soft_spi_device)
    {
        return RT_EOK;
    }
    soft_spi_device = rt_malloc(sizeof(struct rt_spi_device));
    if(!soft_spi_device)
    {
        rt_kprintf("[soft spi]:malloc memory for soft spi_device failed\n");
        result = -RT_ENOMEM;
    }
    memset(soft_spi_device,0,sizeof(struct rt_spi_device));

/* 注册 SPI BUS */
    result = rt_soft_spi_bus_register("soft_spi");
    if(result != RT_EOK)
    {
        rt_kprintf("[soft spi]:register soft spi bus error : %d !!!\n",result);
        goto _exit;
    }

/* 绑定 CS */
    result = rt_spi_bus_attach_device(soft_spi_device,"spi188","soft_spi",NULL);
    if(result != RT_EOK)
    {
        rt_kprintf("[soft spi]:attact spi bus error :%d !!!\n",result);
        goto _exit;
    }
    rt_kprintf("[soft spi]:rt_soft_spi_device init ok\n");
    return RT_EOK;

_exit:
    if(soft_spi_device)
    {
        rt_free(soft_spi_device);
        soft_spi_device = RT_NULL;
    }
    return result;
}
INIT_APP_EXPORT(rt_soft_spi_device_init);

#endif
```

```c
/*
 * Copyright (c) 2006-2018, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 */

#include <rtthread.h>
#ifdef BSP_USING_SDCARD
#if defined(RT_USING_SPI_MSD) && defined(RT_USING_DFS_ELMFAT)
#include <spi_msd.h>
#include <dfs_fs.h>

#define DBG_TAG "sdcard"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>

int sd_mount(void)
{
    int ret = 0;
    ret = msd_init("sd0", "spi188");
    if(RT_EOK == ret)
    {
         if(dfs_mount("sd0", "/", "elm", 0, 0) == 0)
        {
            LOG_I("Mount /sd0  successfully"); 
            return RT_EOK;
        }
        else
        { 
            LOG_E("Mount fail !!1");
            return -1;
        }
    }
    LOG_E("msd_init fail !!!");
    return -2;    
}
INIT_APP_EXPORT(sd_mount);
#endif
#endif
```

自带解析的逻辑分析仪
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20220923/4b409be8cb84ed11fb9924500f8cecf2.png.webp)
**
现在是MISO 一直是0xFF**