S3c2440（ARM9）spi_read_write闪存 [英] S3c2440(ARM9) spi_read_write Flash Memory

问题描述

我正在研究SPI通信。尝试通信SST25VF032B（32 MB微芯片SPI闪存）。
当我阅读制造商ID时，显示MF_ID => 4A25BF
，但最初是MF_ID => BF254A。我得到它只是反向，意味着第一和第三个字节的第一个咬。

可能的原因是什么？
我的SPI Init函数在这里：

  //启用时钟控制寄存器CLKCON 18位使能SPI 
 CLKCON | =（0x01 <18）; // 0x40000; 
 printk（s3c2440_clkcon =％08ld\\\
，CLKCON）; 
 //启用GPG2对应的NSS端口
 GPGCON = 0x1011; // 010000 00 01 00 01 
 printk（s3c2440_GPGCON =％08ld\\\
，GPGCON）; 
 SPNSS0_ENABLE（）; 
 //启用GPE 11,12,13，相应的MISO0，MOSI0，SCK0 = 11 0x0000FC00 
 GPECON& =〜（（3 <22）|（3 < |（3 << 26））; 
 GPECON | =（（2 <22）|（2 <24）|（2 <26））; 
 // GPEUP Set;所有禁用
 GPGUP& =〜（0x07 <2）; 
 GPEUP | =（0x07  // SPI寄存器部分
 // SPI预分频器寄存器设置，
 //波特率= PCLK / 2 /（预分频值+ 1）
 SPPRE0 = 0x18; // freq = 1M 
 printk（SPPRE0 =％02X\\\
，SPPRE0）; 
 
 //轮询，en-sck，master，low，格式A，nomal = 0 | （1 <3）|（1 <3）|（0 <2）|（0 <1）|（1 < 0℃;&小于0）; 
 printk（SPCON1 =％02ld\\\
，SPCON0）; 
 
 //启用多主机错误检测
 SPPIN0 =（0 <2）| （1 <1）| （0 <0）; 
 printk（SPPIN1 =％02X\\\
，SPPIN0）; 
 
 //初始化过程
 SPTDAT0 = 0xff; 
  

我的spi_read_write函数如下：

  static char spi_read_write（unsigned char outb）
 {
 //在SPI接口上写入和读取一个字节。 
 
 int j = 0; 
 unsigned char inb; 
 SPTDAT0 = outb; （j = 0; j <0xFF; j ++）的
 while（！SPI_TXRX_READY）; 
 SPTDAT0 = outb; 
 // SPTDAT0 = 0xff; （j = 0; j <0xFF; j ++）的
 while（！SPI_TXRX_READY）; 
 inb = SPRDAT0; 
 return（inb）; 
} 
  

我的通话功能是：

  MEM_1_CS（0）; 
 spi_read_write（0x9F）; 
 m1 = spi_read_write（0x00）; 
 m2 = spi_read_write（0x00）; 
 m3 = spi_read_write（0x00）; 
 MEM_1_CS（1）; 
 printk（\\\
\rMF_ID =>％02X-％02X-％02X，m1，m2，m3）; 
  

请指导我做什么？
感谢您的提前!!

解决方案

最近几天我正在敲我的头，终于找到解决方案。所有我需要更改我的 spi_read_write 函数如下。

  static char spi_read_write（unsigned char outb）
 {
 int j = 0; 
 unsigned char inb; （j = 0; j <0xFF; j ++）的
 while（！SPI_TXRX_READY）; 
 SPTDAT0 = outb; （j = 0; j <0xFF; j ++）的
 while（！SPI_TXRX_READY）; 
 inb = SPRDAT0; 
 return（inb）; 
} 
  

更改生成：

首先我们要检查 SPI_TXRX_READY 然后用 SPTDAT0 = outb; / code>。

感谢大家的支持。

I am working on SPI communication.Trying to communicate SST25VF032B(32 MB microchip SPI Flash). When I am reading the Manufacturer Id it shows MF_ID =>4A25BF but originally it is MF_ID =>BF254A. I am getting it simply reverse, means first bite in 3rd and 3rd byte in first.

What could be the possible reason for that? My SPI Init function is here:

//Enable clock control register CLKCON 18 Bit enables SPI  
CLKCON |= (0x01 << 18);//0x40000;  
printk("s3c2440_clkcon=%08ld\n",CLKCON);
//Enable GPG2 Corresponding NSS port
GPGCON =0x1011;//010000 00 01 00 01
printk("s3c2440_GPGCON=%08ld\n",GPGCON);
SPNSS0_ENABLE(); 
//Enable GPE 11,12,13,Corresponding MISO0,MOSI0,SCK0 = 11 0x0000FC00
GPECON &= ~((3 << 22) | (3 << 24) | (3 << 26));  
GPECON |=  ((2 << 22) | (2 << 24) | (2 << 26));  
//GPEUP Set; all disable  
GPGUP &= ~(0x07 << 2);    
GPEUP |=  (0x07 << 11);
//SPI Register section
//SPI Prescaler register settings,  
//Baud Rate=PCLK/2/(Prescaler value+1)  
SPPRE0 = 0x18;       //freq = 1M 
printk("SPPRE0=%02X\n",SPPRE0);  

//polling,en-sck,master,low,format A,nomal = 0 | TAGD = 1  
SPCON0 = (0<<5)|(1<<4)|(1<<3)|(0<<2)|(0<<1)|(0<<0);  
printk("SPCON1=%02ld\n",SPCON0);  

//Multi-host error detection is enabled 
SPPIN0 = (0 << 2) | (1 << 1) | (0 << 0);  
printk("SPPIN1=%02X\n",SPPIN0);  

//Initialization procedure
SPTDAT0 = 0xff;

My spi_read_write function as follows:

static char spi_read_write (unsigned char outb) 
{
   // Write and Read a byte on SPI interface.  

   int j = 0;  
   unsigned char inb;
   SPTDAT0 = outb;  
   while(!SPI_TXRX_READY) for(j = 0; j < 0xFF; j++);  
   SPTDAT0 = outb;
   //SPTDAT0 = 0xff;  
   while(!SPI_TXRX_READY) for(j = 0; j < 0xFF; j++);   
   inb = SPRDAT0; 
   return (inb);   
}

My Calling function is:

   MEM_1_CS(0);
   spi_read_write(0x9F);
   m1 = spi_read_write(0x00);
   m2 = spi_read_write(0x00);
   m3 = spi_read_write(0x00);
   MEM_1_CS(1); 
   printk("\n\rMF_ID =>%02X-%02X-%02X",m1,m2,m3); 

Please guide me what to do? Thanks in Advance!!

解决方案

I was banging my head on this from last couple of days and finally I find the solution. All I needed to change my spi_read_write function as follows.

static char spi_read_write (unsigned char outb) 
{
   int j = 0;  
   unsigned char inb;   
   while(!SPI_TXRX_READY) for(j = 0; j < 0xFF; j++); 
   SPTDAT0 = outb;   
   while(!SPI_TXRX_READY) for(j = 0; j < 0xFF; j++);   
   inb = SPRDAT0;
   return (inb);       
}

CHANGES MADE:

First of all we have to check whether the SPI_TXRX_READY then fill the register with the value SPTDAT0 = outb;.

Thanks all for your kind support.

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