SPI接收数据移位，误差解不起作用，无极性误差

您好，我正试图通过SPICI与微芯片上的23 LC1024 SRAM进行通信，用一个DSPIC33 E。我可以在几个不同的插件上写入和读取数据，我的示波器总是给我显示正确的数据（我在某个地址写的东西，在同一个地址上是可读的），但是，当我得到这个数据时收到的数据在我的PIC，所有的数据是一个位移到右边。我的第一个想法是：也许时机不对。但是，我尝试了所有不同的定时，我尝试了所有组合的输入采样相位，时钟边沿和时钟极性。（SMP，CKE和CKP），但问题仍然存在。我在勘误表中看了一下，在那里，当帧模式被启用时，SMP＝1（输入数据在末尾被采样），那么可能出现的问题是接收到的数据由一位移位到右边。我没有启用帧模式，我执行了清除SMP的命令。例如：我将以下小数写入SRAM：120, 7, 9、100（十六进制示波器：78, 07、09, 64）＝0B01111000、0B000、0111、0B000、1001、0B01100100，我在LCD（小数）上得到：60, 3, 132、178＝0B0111100、0B00 000、11、0B10000、0B10110010，所以整个数据一起我从示波器上附加了两个截图。我还把SPI时钟速度从20MHz降低到10，没有改进。因为范围是读取正确的数据，所以我假设整个事情是正确的。这是我的代码和配置：CONFIG:TestCal码。一个解决方案是接收所有数据并将它们转换，但我认为这不是一个好的解决方案。LCD工作正常。我也像数据表中的命令一样做了电源接通状态，所以可能有人知道一个工作区，甚至一个我看不到的错误。感谢任何帮助，多谢！我不能上传图片，这就是为什么我在DoopPoad上直接上传它们：DoDopRAPAD.NET/FILE/U/70818/NMZSKRNKKPNG.HTMDECTURPLADAD.NET/FILE/U/70818/O27 D7S2JYPNG.HTM
                    
                    
               
                                                                                      以下为原文

                                                                            Hello at all,

I am trying to communicate with the 23LC1024 SRAM from Microchip over SPI with a dsPIC33E.
I can write and read data at several different adresses, my oscilloscope always shows me the correct data(what I've written at a certain adress, is readable at the same adress)
BUT, when I get this received data in my pic, all the data is shifted one bit to the right. My first thought was: maybe the timings are wrong. But then I tried all different timings, I tried all combinations for the Input Sample Phase, Clock Edge and Clock Polarity. (SMP, CKE and CKP) but the problem still persits. I had a look in the errata, where it says that when frame Mode is enabled AND SMP=1 (input data sampled at the end) then there could be the trouble that received data is shifted to the right by one bit. I don't have frame Mode enabled and I did the recommandation to clear SMP. Problem still there.

For example: I write the following decimals into the SRAM:
120, 7, 9, 100   ( hex oscilloscope: 78, 07, 09, 64)
= 0b01111000, 0b00000111, 0b00001001, 0b01100100

What I get on my LCD (decimals):
60, 3, 132, 178
= 0b00111100, 0b00000011, 0b10000100, 0b10110010

So the whole data together is shifted one bit to the right.

I attached two screenshots from my oscilloscope.
Also I reduced the SPI Clock Speed from 20Mhz down to 10-no amelioration.
Since the Scope is reading the correct data, I am assuming that the whole thing works correctly.
Here is my code and configurations:

Config:
    SPI1STATbits.SPIEN=0;
    SPI1CON1bits.DISSCK=0; // internal spi clock enabled
    SPI1CON1bits.DISSDO=0; // SDO pin used by SPI
    SPI1CON1bits.MODE16=0; // 8 bits communication
   
    SPI1CON1bits.MSTEN=1; // master mode
   
    SPI1CON1bits.CKP=0; // idle Low
    SPI1CON1bits.SMP=0; // sampled at the middle of output data time
    SPI1CON1bits.CKE=1; // falling edge
   
    // 20MHz ?
    SPI1CON1bits.SPRE=0b110; // secondary 2:1
    SPI1CON1bits.PPRE=0b11; // primary 1:1
   
    SPI1CON2bits.FRMEN=0;
    SPI1CON2bits.SPIBEN=0; //enhanced mode disabled
    SPI1BUF=0x00; // buffer to zero
    SPI1STATbits.SPITBF=0; // clear BF
    SPI1STATbits.SPIEN=1; // enable spi
    SPI1STATbits.SPITBF=0; // clear BF

void Write_RAM(long adress, uint8_t data[], unsigned int n_bytes){
    long adresscut;
   
    CS_RAM=0;
    transmit_SPI1(RAM_WRITE);
   
    //write Adress 3 bytes
    adresscut=((adress & 0xFF0000) >> 16);
    transmit_SPI1(adresscut);
    //
    adresscut=((adress & 0x00FF00) >> 8);
    transmit_SPI1(adresscut);
    //
    adresscut=((adress & 0x00FF00) >> 0);
    transmit_SPI1(adresscut);
   
    int i;
    for(i=0;i         transmit_SPI1(data);
    }
        
    CS_RAM=1;
}

void Read_RAM(long adress, uint8_t data[], unsigned int n_bytes){
    long adresscut;

    CS_RAM=0;
    transmit_SPI1(RAM_READ);
   
    //write Adress 3 bytes
    adresscut=((adress & 0xFF0000) >> 16);
    transmit_SPI1(adresscut);
    //
    adresscut=((adress & 0x00FF00) >> 8);
    transmit_SPI1(adresscut);
    //
    adresscut=((adress & 0x00FF00) >> 0);
    transmit_SPI1(adresscut);
   
    int i;

    for(i=0;i         data=Receive_SPI1();
    }

    CS_RAM=1;
}

void transmit_SPI1(uint8_t wert){
   
    unsigned char dummy;
   
    dummy=SPI1BUF;
    SPI1BUF=wert;
    while(SPI1STATbits.SPIRBF==0)
        ; //wait
    dummy=SPI1BUF;
}

uint8_t Receive_SPI1(){
    unsigned char dummy;
    //SPI1STATbits.SPIRBF=0;
    //dummy=SPI1BUF; //
   
    dummy=SPI1BUF;
    SPI1BUF=0xFF; // Dummy byte
    while(SPI1STATbits.SPIRBF==0)
        ; //wait
    //SPI1STATbits.SPIRBF=0;
   // dummy=SPI1BUF;
    return SPI1BUF;
}

test code:

    init_RAM();
   
    uint8_t datax[]={120,7,9,100};
    uint8_t receivedata[10];
   
    Write_RAM(0x100111, datax, 4);
     
    Read_RAM(0x100111,receivedata,4);

    int i;
    for(i=0;i<4;i++){
        writeINTLCD(receivedata);
        writeLCD(";");
        waitms(2000);
    }

One solution would be to receive all the data and shift them, but thats in my opinion not a nice solution.

The LCD works right. Also I did the power on state like recommanded in the datasheet.
So maybe anyone knows a workarround or even an error I can't see ?
Would appreciate any help,

Many thanks!

I can't upload pictures, thats why I uploaded them on directupload:
directupload.net/file/u/70818/nmzskrnk_png.htm
directupload.net/file/u/70818/o27d7s2j_png.htm

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