W25Q128FV SPI 读ID不稳定

54zw 发表于 2017-3-23 00:24:01

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：

54zw 发表于 2017-5-7 10:17:56

已解决，看这里W25Q128FV SPI 驱动

carter123456 发表于 2017-5-8 15:40:53

你也是牛了给个联系方式让我们好好学习下

chenqian 发表于 2017-6-8 10:08:30

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

54zw 发表于 2017-6-8 15:22:30

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

chenqian 发表于 2017-6-20 11:32:37

#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)))

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);
}
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 = {
{
.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 = {
{
.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 = {0};
unsigned char buf = {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 , buf , buf );

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

//read data
cmd = W25_READ_DATA;
cmd = 0;
cmd = 0;
cmd = 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 = W25_PAGE_PROGRAM;
cmd = 0;
cmd = 0;
cmd = 0;
cmd = 0x88;
ret = w25_write( fd, cmd ,5);
printf("0x88 write ok \n");

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

close(fd);

return ret;
}

chenqian 发表于 2017-6-20 11:34:25

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

54zw 发表于 2017-6-21 17:18:54

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

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W25Q128FV SPI 读ID不稳定