W25Q128FV SPI 读ID不稳定

Chip Platform Rockchip
1

本帖最后由 54zw 于 2017-3-23 00:29 编辑

使用firefly spi demo 读id,会有下面这样的日志，间断性无法读到ID

[ 1108.239354] firefly-spi spi0.0: firefly_spi_read_w25x_id_0: ID = ef 40 18 00 00
[ 1108.239449] firefly-spi spi0.0: firefly_spi_read_w25x_id_1: ID = ef 40 18 00 00
[ 1113.247362] firefly-spi spi0.0: firefly_spi_read_w25x_id_0: ID = ff ff ff ff ff
[ 1113.247447] firefly-spi spi0.0: firefly_spi_read_w25x_id_1: ID = ff ff ff ff ff
[ 1118.255374] firefly-spi spi0.0: firefly_spi_read_w25x_id_0: ID = ef 40 18 00 00
[ 1118.255494] firefly-spi spi0.0: firefly_spi_read_w25x_id_1: ID = ef 40 18 00 00
[ 1123.263382] firefly-spi spi0.0: firefly_spi_read_w25x_id_0: ID = ff ff ff ff ff
[ 1123.263501] firefly-spi spi0.0: firefly_spi_read_w25x_id_1: ID = ff ff ff ff ff
[ 1128.271376] firefly-spi spi0.0: firefly_spi_read_w25x_id_0: ID = ef 40 18 00 00
[ 1128.271497] firefly-spi spi0.0: firefly_spi_read_w25x_id_1: ID = ef 40 18 00 00
[ 1133.279384] firefly-spi spi0.0: firefly_spi_read_w25x_id_0: ID = ef 40 18 00 00
[ 1133.279504] firefly-spi spi0.0: firefly_spi_read_w25x_id_1: ID = ef 40 18 00 00
[ 1138.287380] firefly-spi spi0.0: firefly_spi_read_w25x_id_0: ID = ff ff ff ff ff
[ 1138.287500] firefly-spi spi0.0: firefly_spi_read_w25x_id_1: ID = ff ff ff ff ff
[ 1143.295380] firefly-spi spi0.0: firefly_spi_read_w25x_id_0: ID = ef 40 18 00 00
[ 1143.295500] firefly-spi spi0.0: firefly_spi_read_w25x_id_1: ID = ef 40 18 00 00

代码在原有基础上用定时器不断读取ID

static void timeout_handler(unsigned long tdata)
{
struct spi_device *spi = (struct spi_device *)tdata;

g_sds.timer.expires = jiffies + EXPIRES_PERIOD;
add_timer(&g_sds.timer);
firefly_spi_read_w25x_id_0(spi);
firefly_spi_read_w25x_id_1(spi);
}

static int firefly_spi_probe(struct spi_device *spi)
{
int ret = 0;
struct device_node __maybe_unused *np = spi->dev.of_node;

dev_dbg(&spi->dev, "Firefly SPI demo program\n");

if(!spi)
    return -ENOMEM;

dev_dbg(&spi->dev, "firefly_spi_probe: setup mode %d, %s%s%s%s%u bits/w, %u Hz max\n",
        (int) (spi->mode & (SPI_CPOL | SPI_CPHA)),
        (spi->mode & SPI_CS_HIGH) ? "cs_high, " : "",
        (spi->mode & SPI_LSB_FIRST) ? "lsb, " : "",
        (spi->mode & SPI_3WIRE) ? "3wire, " : "",
        (spi->mode & SPI_LOOP) ? "loopback, " : "",
        spi->bits_per_word, spi->max_speed_hz);

/* init timer */
init_timer(&g_sds.timer);

/* setup the timer */
g_sds.timer.expires = jiffies + EXPIRES_PERIOD;
g_sds.timer.function = timeout_handler;
g_sds.timer.data = (unsigned long)spi;

/* add to system */
add_timer(&g_sds.timer);

return ret;

}

硬件连接图如下：

snap0000.png
snap0000.png473×285 37.6 KB

2

已解决，看这里W25Q128FV SPI 驱动

3

你也是 牛了 给个联系方式 让我们好好学习下

4

你好 ， 我最近要测试一下spi， 我们自己下的的linux版本 ， /dev/下没有spidev，是需要我们自己去注册设备节点还是在make menuconfig中没有注册设备节点，下面是官方自带的.config文件，如果要改这方面驱动，你能不能给一点指导

QQ图片20170608100726.png
QQ图片20170608100726.png1255×395 14.2 KB

5

chenqian 发表于 2017-6-8 10:08
你好 ， 我最近要测试一下spi， 我们自己下的的linux版本 ， /dev/下没有spidev，是需要我们自己去注册设备 …

/dev/spidev是内核里的一个驱动，可以不使用这个，到我github上看下如何写一个spi驱动

https://github.com/54shady/kernel_drivers_examples/tree/Firefly_RK3399/debug/spi

6

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <linux/spi/spidev.h>
/*

  • write a file to spi_flash
    */
    #define W25_WRITE_ENABLE 0x06
    #define W25_WRITE_DISABLE 0x04
    #define W25_READ_STATUS_1 0x05
    #define W25_READ_STATUS_2 0x35
    #define W25_WRITE_STATUS 0x01
    #define W25_READ_DATA 0x03
    #define W25_ERASE_SECTOR 0x20
    #define W25_ERASE_BLOCK 0xD8
    #define W25_PAGE_PROGRAM 0x02
    #define W25_CHIP_ID 0x9F

#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))

static const char* spi_device = “/dev/spidev2.2”;
static unsigned char mode;
static unsigned char bits = 8;
static unsigned int speed = 1000000；

/*

  • 打印出buf的内容

  • @parm info 前面的提示信息
    /
    static void dis_array(const char     info , const unsigned char* buf, unsigned int len){
    int i = 0;
    printf(“%s :”,info);
    for(i = 0; i< len ; i++){
    printf(“%02x " , buf[i]);
    }
    printf(”\n");
    }
    /*

  • write and read
    /
    static int w25_write_read(int fd , const char     wbuf,unsigned int wlen,
    const char* rbuf , unsigned int rlen){

    int ret = 0;
    struct spi_ioc_transfer tr[2] = {
    {
    .tx_buf = (unsigned long)wbuf,
    .rx_buf = 0,
    .len = wlen,
    .speed_hz = speed,
    },
    {
    .tx_buf = 0,
    .rx_buf = (unsigned long)rbuf,
    .len = rlen,
    .speed_hz = speed,
    },
    };

    ret = ioctl(fd , SPI_IOC_MESSAGE(2) , tr);

    return ret;
    }

/*

  • write no read
    /
    static int w25_write(int fd , const char     wbuf,unsigned int wlen){

    int ret = 0;
    struct spi_ioc_transfer tr[1] = {
    {
    .tx_buf = (unsigned long)wbuf,
    .rx_buf = 0,
    .len = wlen,
    .speed_hz = speed,
    }
    };

    ret = ioctl(fd , SPI_IOC_MESSAGE(1) , tr);

    return ret;
    }

int main(int argc , char* argv){
int ret = 0;
int fd;
unsigned char tempcmd = 0;
unsigned char cmd[8] = {0};
unsigned char buf[8] = {0};

fd = open(spi_device , O_RDWR);
if (fd < 0){
	printf("open /dev/spidev error\n ");
}

/*
* spi mode
 */
 ret = ioctl(fd , SPI_IOC_WR_MODE , &mode);
if (ret == -1){
	printf("set spi mode error\n");
}
ret = ioctl(fd , SPI_IOC_RD_MODE , &mode);
if (ret == -1){
	printf("get spi mode error\n");
}

/*
*  bits per word
*/
ret = ioctl(fd , SPI_IOC_WR_BITS_PER_WORD , &bits);
if (ret == -1){
	printf("set bits per word error\n");
}
ret = ioctl(fd , SPI_IOC_RD_BITS_PER_WORD , &bits);
if (ret == -1){
	printf("get bits per word error\n");
}

/*
* max speed hz
*/
ret = ioctl(fd , SPI_IOC_WR_MAX_SPEED_HZ , &speed);
if (ret == -1){
	printf("set max speed error\n");
}
ret = ioctl(fd , SPI_IOC_RD_MAX_SPEED_HZ , &speed);
if (ret == -1){
	printf("get max speed error\n");
}

/*
* print useful info
*/
printf("spi mode: %d\n",mode);
printf("spi bits per words : %d \n" , bits);
printf("spi max speed : %dhz (%dkHz)\n",speed , speed/1000);

//get chip id
tempcmd = W25_CHIP_ID;
ret = w25_write_read(fd, &tempcmd ,  sizeof(tempcmd ), buf , 3 );
printf("w25_flash chip ID : %x , %x , %x\n" , buf[0] , buf[1] , buf[2] );

//erase first sector
tempcmd = W25_WRITE_ENABLE;
w25_write( fd, &tempcmd , 1 );
cmd[0] = W25_ERASE_SECTOR;
cmd[1] = 0;
cmd[2] = 0;
cmd[3] = 0;
ret = w25_write(fd, cmd , 4);
printf("frist sector erase done ..\n");

//read data
cmd[0] = W25_READ_DATA;
cmd[1] = 0;
cmd[2] = 0;
cmd[3] = 0;
ret = w25_write_read(fd, cmd , 4 , buf , sizeof(buf));
dis_array("before write: ",  buf , sizeof(buf));

//write
w25_write( fd, &tempcmd , 1 );
cmd[0] = W25_PAGE_PROGRAM;
cmd[1] = 0;
cmd[2] = 0;
cmd[3] = 0;
cmd[4] = 0x88;
ret = w25_write( fd, cmd ,  5);
printf("0x88 write ok \n");

//read data
cmd[0] = W25_READ_DATA;
cmd[1] = 0;
cmd[2] = 0;
cmd[3] = 0;
ret = w25_write_read(fd, cmd , 4 , buf , sizeof(buf));
dis_array("after write: ",  buf , sizeof(buf));

close(fd);

return ret;

}

7

你好 ，我要用spi写W25q64v这个flash芯片，我根据它的手册和网上的一些资料写了一些测试代码，但是一直读不到数据，打印的数据全部是默认的拉高值ff,你可以把你的demo给我发一份或者看看我代码哪里有问题吗

8

本帖最后由 54zw 于 2017-6-21 17:20 编辑

chenqian 发表于 2017-6-20 11:34
你好 ，我要用spi写W25q64v这个flash芯片，我根据它的手册和网上的一些资料写了一些测试代码，但是一直读不 …

http://developer.t-firefly.com/thread-12059-1-1.html

所有代码都在github上 https://github.com/54shady/kernel_drivers_examples/tree/Firefly_RK3399/debug/spi