SPI receive in SPI master, byte shifting in the buffer

GG23800
Posts: 4
Joined: Thu Apr 25, 2019 6:41 pm

SPI receive in SPI master, byte shifting in the buffer

Postby GG23800 » Thu Apr 25, 2019 7:18 pm

Hi all,

I am trying to read data from a device on SPI bus using DMA. This device work in half_duplex only. I want to read successively large amount of data considering the ESP is the master. So I initialise the spi with:

Code: Select all

#define SPI_MOSI      23
#define SPI_MISO      19
#define SPI_CLK       18
#define SPI_COM_SPEED    5000000
#define SPI_ENABLE1         5                                                  
#define SPI_ENABLE2         4     

spi_device_handle_t spi;
uint8_t *lines;

static void USC_spi_init()
{
    gpio_set_pull_mode(SPI_MOSI, GPIO_PULLUP_ONLY);
    gpio_set_pull_mode(SPI_CLK, GPIO_PULLUP_ONLY);
    gpio_set_pull_mode(SPI_MISO, GPIO_PULLUP_ONLY);

    spi_bus_config_t buscfg={ 
        .miso_io_num = SPI_MISO,
        .mosi_io_num = SPI_MOSI,
        .sclk_io_num = SPI_CLK,
        .quadwp_io_num = -1,
        .quadhd_io_num = -1,
        .max_transfer_sz = SPI_MAX_DMA_LEN
    };

    spi_device_interface_config_t devcfg={
        .clock_speed_hz = SPI_COM_SPEED,      //Bus frequency
        .mode = 1,                            //SPI mode 1: polarity 0, phase 1
        .spics_io_num = -1,                   //CS pin
        .queue_size = 1,                      /
        .flags = SPI_DEVICE_HALFDUPLEX
    };
    
    spi_bus_initialize(VSPI_HOST, &buscfg, 2); //last flag, 0 no DMA, 1 or 2 DMA
    /* On attache la carte US au bus SPI */
    spi_bus_add_device(VSPI_HOST, &devcfg, &spi);
}
I initialise the DMA buffer with:

Code: Select all

uint8_t *lines;

void init_line_buffer(uint8_t **line_buff)
{
    uint8_t *temp=NULL;
    bool toto=false;
    temp=(uint8_t *)heap_caps_malloc(4096, MALLOC_CAP_DMA); //size is in byte and need to be %4
    if (temp==NULL) {printf("error with pvPortMallocCaps line\n");}
    toto=esp_ptr_dma_capable(temp);
    if (toto==0) {printf("\n\n\nWARNING, can't initiate line DMA buffer!!!\n\n\n");}
    (*line_buff)=temp;
}

void delete_line_buffer(uint8_t **line_buff)
{
    heap_caps_free(*line_buff);
}
To read data from the device, i have:

Code: Select all

epf_error_t USC_read_8bline_auto(int nbpoint)
{
    int ret=0;
    epf_error_t err = EPF_ERR_NOERROR;
    printf("number of points: %i\n", nbpoint);

    spi_transaction_t t;
    memset(&t, 0, sizeof(t));
    t.length=0; //8*nbpoint; to try in full duplex mode
    t.tx_buffer=NULL;
    t.rx_buffer=lines;
    t.rxlength=8*nbpoint;//to be %4;
    gpio_set_level(SPI_ENABLE2, 0);
    ret=spi_device_transmit(spi, &t);
    //ret=spi_device_polling_transmit(spi, &t);
    if (ret)
    {
        err = EPF_ERR_SPI;
        return err;
        printf("error while reading spi in read validation function\n");
    }
    gpio_set_level(SPI_ENABLE2, 1);

    return err;
}
where SPI_ENABLE2 act as CS line.

And then in my main code I have:

Code: Select all

    init_line_buffer(&lines);
    int np=256;

    for (int i=0 ; i<10 ; i++)
    {
        for (int k=0 ; k<np ; k++) {lines[k]=0;}
        USC_ask_8bline_auto();
        usleep(300);
        err=USC_read_8bline_auto(np);
        printf("loop %i\n", i);
        for (int j=np-100 ; j<np ; j++)
        {
            printf("data[%i]=%i, ",j, lines[j]);
        }
        printf("\n\n");
        
        delete_line_buffer(&lines)
    }
where USC_ask_8bline_auto() is function that send a command to the device in SPI to ask for data, this command is 6 bytes long. So in this example I ask and read 10 times via SPI. My logs are then:
data[28]=127, data[29]=127, data[30]=127, data[31]=127, data[32]=127, data[33]=126, data[34]=127, data[35]=127, data[36]=127, data[37]=126, data[38]=126, data[39]=127, data[40]=127, data[41]=127, data[42]=127, data[43]=127, data[44]=127, data[45]=127, data[46]=127, data[47]=126, data[48]=126, data[49]=126, data[50]=126, data[51]=127, data[52]=126, data[53]=126, data[54]=126, data[55]=126, data[56]=126, data[57]=127, data[58]=126, data[59]=127, data[60]=126, data[61]=126, data[62]=127, data[63]=127, data[64]=127, data[65]=126, data[66]=127, data[67]=127, data[68]=126, data[69]=127, data[70]=127, data[71]=127, data[72]=127, data[73]=127, data[74]=127, data[75]=127, data[76]=127, data[77]=127, data[78]=127, data[79]=127, data[80]=127, data[81]=127, data[82]=127, data[83]=127, data[84]=127, data[85]=127, data[86]=127, data[87]=127, data[88]=126, data[89]=126, data[90]=127, data[91]=127, data[92]=127, data[93]=127, data[94]=127, data[95]=127, data[96]=127, data[97]=127, data[98]=127, data[99]=126, data[100]=127, data[101]=127, data[102]=127, data[103]=127, data[104]=127, data[105]=127, data[106]=127, data[107]=127, data[108]=126, data[109]=127, data[110]=126, data[111]=127, data[112]=126, data[113]=127, data[114]=126, data[115]=127, data[116]=127, data[117]=127, data[118]=127, data[119]=126, data[120]=126, data[121]=127, data[122]=0, data[123]=0, data[124]=0, data[125]=0, data[126]=0, data[127]=0,

loop 1
data[28]=126, data[29]=127, data[30]=127, data[31]=126, data[32]=127, data[33]=126, data[34]=127, data[35]=126, data[36]=127, data[37]=127, data[38]=127, data[39]=127, data[40]=126, data[41]=127, data[42]=126, data[43]=126, data[44]=127, data[45]=127, data[46]=127, data[47]=127, data[48]=126, data[49]=127, data[50]=126, data[51]=126, data[52]=127, data[53]=126, data[54]=126, data[55]=127, data[56]=127, data[57]=126, data[58]=126, data[59]=127, data[60]=127, data[61]=127, data[62]=127, data[63]=127, data[64]=127, data[65]=126, data[66]=127, data[67]=127, data[68]=127, data[69]=126, data[70]=127, data[71]=127, data[72]=127, data[73]=127, data[74]=127, data[75]=127, data[76]=127, data[77]=127, data[78]=127, data[79]=127, data[80]=127, data[81]=127, data[82]=127, data[83]=127, data[84]=127, data[85]=127, data[86]=127, data[87]=127, data[88]=127, data[89]=127, data[90]=127, data[91]=127, data[92]=127, data[93]=127, data[94]=127, data[95]=127, data[96]=127, data[97]=127, data[98]=127, data[99]=127, data[100]=127, data[101]=127, data[102]=127, data[103]=127, data[104]=127, data[105]=127, data[106]=127, data[107]=127, data[108]=127, data[109]=127, data[110]=127, data[111]=126, data[112]=127, data[113]=127, data[114]=127, data[115]=127, data[116]=0, data[117]=0, data[118]=0, data[119]=0, data[120]=0, data[121]=0, data[122]=0, data[123]=0, data[124]=0, data[125]=0, data[126]=0, data[127]=0,

loop 2
data[28]=127, data[29]=127, data[30]=127, data[31]=126, data[32]=126, data[33]=127, data[34]=127, data[35]=127, data[36]=127, data[37]=127, data[38]=126, data[39]=127, data[40]=127, data[41]=126, data[42]=126, data[43]=127, data[44]=127, data[45]=127, data[46]=127, data[47]=126, data[48]=127, data[49]=127, data[50]=127, data[51]=126, data[52]=126, data[53]=127, data[54]=127, data[55]=127, data[56]=127, data[57]=127, data[58]=127, data[59]=126, data[60]=127, data[61]=126, data[62]=127, data[63]=127, data[64]=127, data[65]=127, data[66]=127, data[67]=127, data[68]=127, data[69]=127, data[70]=127, data[71]=127, data[72]=127, data[73]=127, data[74]=127, data[75]=127, data[76]=127, data[77]=127, data[78]=127, data[79]=127, data[80]=127, data[81]=127, data[82]=127, data[83]=126, data[84]=127, data[85]=127, data[86]=127, data[87]=127, data[88]=127, data[89]=127, data[90]=127, data[91]=127, data[92]=127, data[93]=127, data[94]=127, data[95]=127, data[96]=127, data[97]=127, data[98]=127, data[99]=127, data[100]=126, data[101]=127, data[102]=127, data[103]=127, data[104]=127, data[105]=127, data[106]=127, data[107]=126, data[108]=127, data[109]=126, data[110]=0, data[111]=0, data[112]=0, data[113]=0, data[114]=0, data[115]=0, data[116]=0, data[117]=0, data[118]=0, data[119]=0, data[120]=0, data[121]=0, data[122]=0, data[123]=0, data[124]=0, data[125]=0, data[126]=0, data[127]=0,

loop 3
data[28]=127, data[29]=126, data[30]=127, data[31]=126, data[32]=127, data[33]=127, data[34]=127, data[35]=126, data[36]=127, data[37]=126, data[38]=126, data[39]=127, data[40]=127, data[41]=127, data[42]=127, data[43]=127, data[44]=127, data[45]=127, data[46]=127, data[47]=127, data[48]=126, data[49]=127, data[50]=126, data[51]=126, data[52]=126, data[53]=127, data[54]=127, data[55]=127, data[56]=126, data[57]=126, data[58]=126, data[59]=127, data[60]=127, data[61]=127, data[62]=127, data[63]=126, data[64]=127, data[65]=127, data[66]=127, data[67]=127, data[68]=126, data[69]=127, data[70]=127, data[71]=127, data[72]=127, data[73]=127, data[74]=127, data[75]=127, data[76]=127, data[77]=127, data[78]=127, data[79]=127, data[80]=127, data[81]=127, data[82]=127, data[83]=127, data[84]=127, data[85]=127, data[86]=127, data[87]=127, data[88]=127, data[89]=127, data[90]=127, data[91]=127, data[92]=127, data[93]=127, data[94]=127, data[95]=127, data[96]=127, data[97]=127, data[98]=127, data[99]=127, data[100]=127, data[101]=126, data[102]=127, data[103]=127, data[104]=0, data[105]=0, data[106]=0, data[107]=0, data[108]=0, data[109]=0, data[110]=0, data[111]=0, data[112]=0, data[113]=0, data[114]=0, data[115]=0, data[116]=0, data[117]=0, data[118]=0, data[119]=0, data[120]=0, data[121]=0, data[122]=0, data[123]=0, data[124]=0, data[125]=0, data[126]=0, data[127]=0,

loop 4
data[28]=127, data[29]=127, data[30]=127, data[31]=127, data[32]=127, data[33]=127, data[34]=127, data[35]=127, data[36]=127, data[37]=127, data[38]=127, data[39]=127, data[40]=127, data[41]=127, data[42]=126, data[43]=126, data[44]=126, data[45]=127, data[46]=127, data[47]=126, data[48]=126, data[49]=127, data[50]=126, data[51]=126, data[52]=127, data[53]=126, data[54]=126, data[55]=126, data[56]=126, data[57]=127, data[58]=127, data[59]=127, data[60]=127, data[61]=127, data[62]=127, data[63]=127, data[64]=127, data[65]=127, data[66]=127, data[67]=127, data[68]=127, data[69]=127, data[70]=127, data[71]=127, data[72]=127, data[73]=127, data[74]=127, data[75]=126, data[76]=127, data[77]=127, data[78]=127, data[79]=127, data[80]=127, data[81]=127, data[82]=127, data[83]=126, data[84]=127, data[85]=127, data[86]=127, data[87]=127, data[88]=127, data[89]=127, data[90]=127, data[91]=127, data[92]=127, data[93]=127, data[94]=127, data[95]=127, data[96]=127, data[97]=127, data[98]=0, data[99]=0, data[100]=0, data[101]=0, data[102]=0, data[103]=0, data[104]=0, data[105]=0, data[106]=0, data[107]=0, data[108]=0, data[109]=0, data[110]=0, data[111]=0, data[112]=0, data[113]=0, data[114]=0, data[115]=0, data[116]=0, data[117]=0, data[118]=0, data[119]=0, data[120]=0, data[121]=0, data[122]=0, data[123]=0, data[124]=0, data[125]=0, data[126]=0, data[127]=0,

loop 5
data[28]=127, data[29]=127, data[30]=127, data[31]=126, data[32]=127, data[33]=127, data[34]=127, data[35]=127, data[36]=127, data[37]=127, data[38]=127, data[39]=126, data[40]=127, data[41]=126, data[42]=126, data[43]=127, data[44]=127, data[45]=127, data[46]=126, data[47]=126, data[48]=127, data[49]=127, data[50]=126, data[51]=126, data[52]=126, data[53]=127, data[54]=127, data[55]=127, data[56]=126, data[57]=127, data[58]=127, data[59]=126, data[60]=127, data[61]=127, data[62]=127, data[63]=127, data[64]=127, data[65]=127, data[66]=127, data[67]=127, data[68]=127, data[69]=127, data[70]=127, data[71]=127, data[72]=127, data[73]=127, data[74]=127, data[75]=127, data[76]=127, data[77]=127, data[78]=127, data[79]=127, data[80]=127, data[81]=127, data[82]=127, data[83]=127, data[84]=127, data[85]=127, data[86]=127, data[87]=127, data[88]=127, data[89]=127, data[90]=127, data[91]=127, data[92]=0, data[93]=0, data[94]=0, data[95]=0, data[96]=0, data[97]=0, data[98]=0, data[99]=0, data[100]=0, data[101]=0, data[102]=0, data[103]=0, data[104]=0, data[105]=0, data[106]=0, data[107]=0, data[108]=0, data[109]=0, data[110]=0, data[111]=0, data[112]=0, data[113]=0, data[114]=0, data[115]=0, data[116]=0, data[117]=0, data[118]=0, data[119]=0, data[120]=0, data[121]=0, data[122]=0, data[123]=0, data[124]=0, data[125]=0, data[126]=0, data[127]=0,

loop 6
data[28]=127, data[29]=127, data[30]=127, data[31]=127, data[32]=126, data[33]=126, data[34]=126, data[35]=127, data[36]=127, data[37]=127, data[38]=127, data[39]=127, data[40]=127, data[41]=126, data[42]=127, data[43]=126, data[44]=126, data[45]=127, data[46]=127, data[47]=127, data[48]=126, data[49]=126, data[50]=127, data[51]=126, data[52]=127, data[53]=127, data[54]=126, data[55]=127, data[56]=127, data[57]=126, data[58]=127, data[59]=126, data[60]=127, data[61]=127, data[62]=127, data[63]=127, data[64]=127, data[65]=126, data[66]=127, data[67]=126, data[68]=127, data[69]=127, data[70]=127, data[71]=127, data[72]=127, data[73]=127, data[74]=127, data[75]=127, data[76]=127, data[77]=127, data[78]=127, data[79]=127, data[80]=127, data[81]=127, data[82]=127, data[83]=127, data[84]=127, data[85]=127, data[86]=0, data[87]=0, data[88]=0, data[89]=0, data[90]=0, data[91]=0, data[92]=0, data[93]=0, data[94]=0, data[95]=0, data[96]=0, data[97]=0, data[98]=0, data[99]=0, data[100]=0, data[101]=0, data[102]=0, data[103]=0, data[104]=0, data[105]=0, data[106]=0, data[107]=0, data[108]=0, data[109]=0, data[110]=0, data[111]=0, data[112]=0, data[113]=0, data[114]=0, data[115]=0, data[116]=0, data[117]=0, data[118]=0, data[119]=0, data[120]=0, data[121]=0, data[122]=0, data[123]=0, data[124]=0, data[125]=0, data[126]=0, data[127]=0,

loop 7
data[28]=127, data[29]=127, data[30]=127, data[31]=127, data[32]=127, data[33]=127, data[34]=127, data[35]=126, data[36]=127, data[37]=127, data[38]=127, data[39]=127, data[40]=127, data[41]=126, data[42]=127, data[43]=126, data[44]=127, data[45]=126, data[46]=126, data[47]=126, data[48]=126, data[49]=127, data[50]=127, data[51]=127, data[52]=126, data[53]=127, data[54]=127, data[55]=127, data[56]=127, data[57]=127, data[58]=127, data[59]=127, data[60]=126, data[61]=127, data[62]=127, data[63]=127, data[64]=127, data[65]=127, data[66]=127, data[67]=127, data[68]=127, data[69]=127, data[70]=127, data[71]=127, data[72]=127, data[73]=127, data[74]=127, data[75]=126, data[76]=127, data[77]=127, data[78]=127, data[79]=127, data[80]=0, data[81]=0, data[82]=0, data[83]=0, data[84]=0, data[85]=0, data[86]=0, data[87]=0, data[88]=0, data[89]=0, data[90]=0, data[91]=0, data[92]=0, data[93]=0, data[94]=0, data[95]=0, data[96]=0, data[97]=0, data[98]=0, data[99]=0, data[100]=0, data[101]=0, data[102]=0, data[103]=0, data[104]=0, data[105]=0, data[106]=0, data[107]=0, data[108]=0, data[109]=0, data[110]=0, data[111]=0, data[112]=0, data[113]=0, data[114]=0, data[115]=0, data[116]=0, data[117]=0, data[118]=0, data[119]=0, data[120]=0, data[121]=0, data[122]=0, data[123]=0, data[124]=0, data[125]=0, data[126]=0, data[127]=0,

loop 8
data[28]=127, data[29]=127, data[30]=127, data[31]=127, data[32]=126, data[33]=127, data[34]=127, data[35]=127, data[36]=126, data[37]=126, data[38]=127, data[39]=127, data[40]=126, data[41]=126, data[42]=126, data[43]=126, data[44]=126, data[45]=126, data[46]=127, data[47]=126, data[48]=126, data[49]=127, data[50]=126, data[51]=127, data[52]=127, data[53]=127, data[54]=127, data[55]=126, data[56]=127, data[57]=126, data[58]=127, data[59]=127, data[60]=127, data[61]=127, data[62]=127, data[63]=127, data[64]=127, data[65]=127, data[66]=127, data[67]=127, data[68]=127, data[69]=126, data[70]=127, data[71]=127, data[72]=127, data[73]=127, data[74]=0, data[75]=0, data[76]=0, data[77]=0, data[78]=0, data[79]=0, data[80]=0, data[81]=0, data[82]=0, data[83]=0, data[84]=0, data[85]=0, data[86]=0, data[87]=0, data[88]=0, data[89]=0, data[90]=0, data[91]=0, data[92]=0, data[93]=0, data[94]=0, data[95]=0, data[96]=0, data[97]=0, data[98]=0, data[99]=0, data[100]=0, data[101]=0, data[102]=0, data[103]=0, data[104]=0, data[105]=0, data[106]=0, data[107]=0, data[108]=0, data[109]=0, data[110]=0, data[111]=0, data[112]=0, data[113]=0, data[114]=0, data[115]=0, data[116]=0, data[117]=0, data[118]=0, data[119]=0, data[120]=0, data[121]=0, data[122]=0, data[123]=0, data[124]=0, data[125]=0, data[126]=0, data[127]=0,

loop 9
data[28]=126, data[29]=127, data[30]=127, data[31]=127, data[32]=127, data[33]=127, data[34]=127, data[35]=126, data[36]=127, data[37]=126, data[38]=127, data[39]=127, data[40]=127, data[41]=127, data[42]=127, data[43]=127, data[44]=126, data[45]=126, data[46]=127, data[47]=126, data[48]=127, data[49]=127, data[50]=126, data[51]=126, data[52]=127, data[53]=126, data[54]=127, data[55]=127, data[56]=127, data[57]=127, data[58]=126, data[59]=127, data[60]=127, data[61]=127, data[62]=126, data[63]=127, data[64]=127, data[65]=127, data[66]=127, data[67]=127, data[68]=0, data[69]=0, data[70]=0, data[71]=0, data[72]=0, data[73]=0, data[74]=0, data[75]=0, data[76]=0, data[77]=0, data[78]=0, data[79]=0, data[80]=0, data[81]=0, data[82]=0, data[83]=0, data[84]=0, data[85]=0, data[86]=0, data[87]=0, data[88]=0, data[89]=0, data[90]=0, data[91]=0, data[92]=0, data[93]=0, data[94]=0, data[95]=0, data[96]=0, data[97]=0, data[98]=0, data[99]=0, data[100]=0, data[101]=0, data[102]=0, data[103]=0, data[104]=0, data[105]=0, data[106]=0, data[107]=0, data[108]=0, data[109]=0, data[110]=0, data[111]=0, data[112]=0, data[113]=0, data[114]=0, data[115]=0, data[116]=0, data[117]=0, data[118]=0, data[119]=0, data[120]=0, data[121]=0, data[122]=0, data[123]=0, data[124]=0, data[125]=0, data[126]=0, data[127]=0,
Basically, the device send random 126/127.
We see that each time we read data from SPI, the buffer filling shit 6 bytes on the left. I have check on the oscilloscope that the data are sent correctly by the device, no 0 are sent.

How can I fix this problem?

Note that if I read only one byte (at the end of the while loop) using the native rx_buffer of the spi_transaction_t structure, the shift is 6 bytes at each time, there is a kind of reset of the shifting.
Last edited by GG23800 on Fri Apr 26, 2019 7:05 am, edited 1 time in total.

ESP_Sprite
Posts: 3262
Joined: Thu Nov 26, 2015 4:08 am

Re: SPI receive in SPI master, byte shifting in the buffer

Postby ESP_Sprite » Fri Apr 26, 2019 2:58 am

Can I ask why you do your CS in software, instead of using the hardware CS?

GG23800
Posts: 4
Joined: Thu Apr 25, 2019 6:41 pm

Re: SPI receive in SPI master, byte shifting in the buffer

Postby GG23800 » Fri Apr 26, 2019 6:51 am

Hi ESP_Sprite,

I do my CS in soft because in need two CS line with this device, one to telling it that it will have to read from the SPI, the second to tell him that it will write on the SPI. To improve efficiency, I will include the reading CS line in the spi_bus_config_t structure latter.

GG23800
Posts: 4
Joined: Thu Apr 25, 2019 6:41 pm

Re: SPI receive in SPI master, byte shifting in the buffer

Postby GG23800 » Fri Apr 26, 2019 7:10 am

I have also try to shift my receive buffer to see if I receive the whole data with:

Code: Select all

epf_error_t USC_read_8bline_auto(int nbpoint, int offset)
{
    int ret=0;
    epf_error_t err = EPF_ERR_NOERROR;
    printf("number of points: %i\n", nbpoint);

    spi_transaction_t t;
    memset(&t, 0, sizeof(t));
    t.length=0;
    t.tx_buffer=NULL;
    t.rx_buffer=&lines[offset];
    t.rxlength=8*nbpoint;//to be %4;
    gpio_set_level(SPI_ENABLE2, 0);
    ret=spi_device_transmit(spi, &t);
    //ret=spi_device_polling_transmit(spi, &t);
    if (ret)
    {
        err = EPF_ERR_SPI;
        return err;
        printf("error while reading spi in read validation function\n");
    }
    gpio_set_level(SPI_ENABLE2, 1);

    return err;
}
And in my main I have now:

Code: Select all

 for (int i=0 ; i<10 ; i++)
    {
        for (int k=0 ; k<np ; k++) {lines[k]=0;}
        USC_ask_8bline_auto();
        usleep(300);
        err=USC_read_8bline_auto(np,6*(i+1));
        printf("loop %i\n", i);
        for (int j=np-100 ; j<np ; j++)
        {
            printf("data[%i]=%i, ",j, lines[j]);
        }
        printf("\n\n");
    }
Which work more or less, I have now:
I (23701) spi_master: Allocate RX buffer for DMA
loop 0
data[28]=126, data[29]=126, data[30]=126, data[31]=126, data[32]=126, data[33]=127, data[34]=126, data[35]=127, data[36]=126, data[37]=126, data[38]=126, data[39]=126, data[40]=127, data[41]=127, data[42]=127, data[43]=127, data[44]=127, data[45]=127, data[46]=127, data[47]=127, data[48]=127, data[49]=127, data[50]=127, data[51]=127, data[52]=127, data[53]=127, data[54]=127, data[55]=127, data[56]=127, data[57]=127, data[58]=127, data[59]=127, data[60]=127, data[61]=126, data[62]=127, data[63]=127, data[64]=127, data[65]=127, data[66]=127, data[67]=127, data[68]=127, data[69]=127, data[70]=127, data[71]=127, data[72]=127, data[73]=127, data[74]=127, data[75]=127, data[76]=127, data[77]=127, data[78]=127, data[79]=127, data[80]=127, data[81]=127, data[82]=127, data[83]=127, data[84]=127, data[85]=127, data[86]=127, data[87]=127, data[88]=127, data[89]=127, data[90]=127, data[91]=126, data[92]=126, data[93]=126, data[94]=126, data[95]=126, data[96]=127, data[97]=127, data[98]=127, data[99]=127, data[100]=127, data[101]=126, data[102]=127, data[103]=126, data[104]=126, data[105]=127, data[106]=126, data[107]=126, data[108]=126, data[109]=127, data[110]=127, data[111]=127, data[112]=127, data[113]=127, data[114]=127, data[115]=127, data[116]=126, data[117]=127, data[118]=127, data[119]=127, data[120]=127, data[121]=127, data[122]=127, data[123]=127, data[124]=126, data[125]=127, data[126]=127, data[127]=127,

loop 1
data[28]=126, data[29]=127, data[30]=126, data[31]=126, data[32]=126, data[33]=126, data[34]=126, data[35]=127, data[36]=127, data[37]=126, data[38]=126, data[39]=127, data[40]=126, data[41]=126, data[42]=126, data[43]=126, data[44]=126, data[45]=126, data[46]=126, data[47]=126, data[48]=126, data[49]=127, data[50]=127, data[51]=127, data[52]=127, data[53]=127, data[54]=127, data[55]=127, data[56]=127, data[57]=127, data[58]=127, data[59]=127, data[60]=127, data[61]=127, data[62]=127, data[63]=127, data[64]=126, data[65]=127, data[66]=127, data[67]=127, data[68]=127, data[69]=127, data[70]=127, data[71]=127, data[72]=127, data[73]=127, data[74]=127, data[75]=127, data[76]=127, data[77]=127, data[78]=127, data[79]=127, data[80]=127, data[81]=127, data[82]=127, data[83]=127, data[84]=127, data[85]=127, data[86]=127, data[87]=127, data[88]=127, data[89]=127, data[90]=127, data[91]=127, data[92]=127, data[93]=127, data[94]=127, data[95]=127, data[96]=127, data[97]=127, data[98]=127, data[99]=127, data[100]=127, data[101]=126, data[102]=127, data[103]=127, data[104]=127, data[105]=126, data[106]=126, data[107]=127, data[108]=127, data[109]=126, data[110]=127, data[111]=127, data[112]=126, data[113]=127, data[114]=127, data[115]=126, data[116]=126, data[117]=126, data[118]=126, data[119]=127, data[120]=127, data[121]=127, data[122]=127, data[123]=127, data[124]=127, data[125]=126, data[126]=127, data[127]=127,

I (23965) spi_master: Allocate RX buffer for DMA
loop 2
data[28]=127, data[29]=127, data[30]=127, data[31]=127, data[32]=126, data[33]=127, data[34]=127, data[35]=127, data[36]=127, data[37]=126, data[38]=127, data[39]=126, data[40]=126, data[41]=126, data[42]=126, data[43]=127, data[44]=126, data[45]=126, data[46]=126, data[47]=127, data[48]=127, data[49]=126, data[50]=126, data[51]=126, data[52]=126, data[53]=126, data[54]=127, data[55]=126, data[56]=126, data[57]=126, data[58]=127, data[59]=127, data[60]=127, data[61]=127, data[62]=127, data[63]=126, data[64]=127, data[65]=127, data[66]=126, data[67]=127, data[68]=127, data[69]=127, data[70]=127, data[71]=127, data[72]=127, data[73]=127, data[74]=127, data[75]=127, data[76]=127, data[77]=127, data[78]=127, data[79]=127, data[80]=127, data[81]=127, data[82]=127, data[83]=127, data[84]=127, data[85]=127, data[86]=127, data[87]=127, data[88]=127, data[89]=127, data[90]=127, data[91]=127, data[92]=127, data[93]=127, data[94]=127, data[95]=127, data[96]=127, data[97]=127, data[98]=127, data[99]=127, data[100]=127, data[101]=127, data[102]=127, data[103]=127, data[104]=127, data[105]=127, data[106]=127, data[107]=127, data[108]=127, data[109]=126, data[110]=127, data[111]=126, data[112]=126, data[113]=126, data[114]=127, data[115]=127, data[116]=127, data[117]=127, data[118]=126, data[119]=127, data[120]=127, data[121]=127, data[122]=127, data[123]=127, data[124]=127, data[125]=127, data[126]=127, data[127]=127,

loop 3
data[28]=127, data[29]=127, data[30]=127, data[31]=127, data[32]=127, data[33]=127, data[34]=127, data[35]=127, data[36]=127, data[37]=127, data[38]=127, data[39]=126, data[40]=127, data[41]=126, data[42]=126, data[43]=126, data[44]=126, data[45]=126, data[46]=126, data[47]=126, data[48]=126, data[49]=126, data[50]=126, data[51]=126, data[52]=126, data[53]=126, data[54]=126, data[55]=126, data[56]=126, data[57]=126, data[58]=127, data[59]=127, data[60]=127, data[61]=127, data[62]=127, data[63]=127, data[64]=127, data[65]=127, data[66]=127, data[67]=127, data[68]=127, data[69]=127, data[70]=127, data[71]=127, data[72]=127, data[73]=127, data[74]=127, data[75]=127, data[76]=127, data[77]=127, data[78]=127, data[79]=127, data[80]=127, data[81]=127, data[82]=127, data[83]=127, data[84]=127, data[85]=127, data[86]=127, data[87]=127, data[88]=127, data[89]=127, data[90]=127, data[91]=127, data[92]=127, data[93]=127, data[94]=127, data[95]=127, data[96]=127, data[97]=127, data[98]=127, data[99]=127, data[100]=127, data[101]=126, data[102]=127, data[103]=127, data[104]=127, data[105]=127, data[106]=127, data[107]=127, data[108]=127, data[109]=127, data[110]=127, data[111]=127, data[112]=127, data[113]=127, data[114]=127, data[115]=126, data[116]=126, data[117]=126, data[118]=126, data[119]=126, data[120]=127, data[121]=127, data[122]=127, data[123]=127, data[124]=127, data[125]=127, data[126]=127, data[127]=126,

I (24229) spi_master: Allocate RX buffer for DMA
loop 4
data[28]=0, data[29]=0, data[30]=126, data[31]=127, data[32]=127, data[33]=127, data[34]=127, data[35]=127, data[36]=127, data[37]=127, data[38]=127, data[39]=127, data[40]=127, data[41]=127, data[42]=127, data[43]=127, data[44]=127, data[45]=126, data[46]=127, data[47]=126, data[48]=126, data[49]=126, data[50]=127, data[51]=126, data[52]=126, data[53]=126, data[54]=126, data[55]=126, data[56]=126, data[57]=127, data[58]=126, data[59]=127, data[60]=127, data[61]=126, data[62]=127, data[63]=126, data[64]=126, data[65]=126, data[66]=127, data[67]=127, data[68]=127, data[69]=127, data[70]=127, data[71]=127, data[72]=127, data[73]=127, data[74]=127, data[75]=127, data[76]=127, data[77]=127, data[78]=127, data[79]=127, data[80]=127, data[81]=127, data[82]=127, data[83]=127, data[84]=127, data[85]=127, data[86]=127, data[87]=127, data[88]=127, data[89]=127, data[90]=127, data[91]=127, data[92]=127, data[93]=127, data[94]=127, data[95]=127, data[96]=127, data[97]=127, data[98]=127, data[99]=127, data[100]=127, data[101]=127, data[102]=127, data[103]=127, data[104]=127, data[105]=127, data[106]=127, data[107]=127, data[108]=127, data[109]=127, data[110]=127, data[111]=127, data[112]=127, data[113]=127, data[114]=127, data[115]=127, data[116]=127, data[117]=127, data[118]=127, data[119]=127, data[120]=126, data[121]=127, data[122]=127, data[123]=126, data[124]=126, data[125]=126, data[126]=127, data[127]=126,

loop 5
data[28]=0, data[29]=0, data[30]=0, data[31]=0, data[32]=0, data[33]=0, data[34]=0, data[35]=0, data[36]=126, data[37]=127, data[38]=127, data[39]=127, data[40]=127, data[41]=127, data[42]=127, data[43]=127, data[44]=127, data[45]=127, data[46]=127, data[47]=127, data[48]=126, data[49]=127, data[50]=127, data[51]=127, data[52]=127, data[53]=126, data[54]=126, data[55]=127, data[56]=127, data[57]=126, data[58]=126, data[59]=127, data[60]=127, data[61]=126, data[62]=126, data[63]=126, data[64]=126, data[65]=126, data[66]=126, data[67]=126, data[68]=126, data[69]=126, data[70]=126, data[71]=127, data[72]=127, data[73]=127, data[74]=127, data[75]=127, data[76]=127, data[77]=127, data[78]=127, data[79]=127, data[80]=127, data[81]=127, data[82]=127, data[83]=127, data[84]=127, data[85]=127, data[86]=126, data[87]=127, data[88]=127, data[89]=127, data[90]=127, data[91]=127, data[92]=127, data[93]=127, data[94]=127, data[95]=127, data[96]=127, data[97]=127, data[98]=127, data[99]=127, data[100]=127, data[101]=127, data[102]=127, data[103]=127, data[104]=127, data[105]=127, data[106]=127, data[107]=127, data[108]=127, data[109]=127, data[110]=127, data[111]=127, data[112]=127, data[113]=126, data[114]=127, data[115]=127, data[116]=127, data[117]=127, data[118]=127, data[119]=127, data[120]=127, data[121]=127, data[122]=127, data[123]=127, data[124]=127, data[125]=127, data[126]=127, data[127]=127,

I (24492) spi_master: Allocate RX buffer for DMA
loop 6
data[28]=0, data[29]=0, data[30]=0, data[31]=0, data[32]=0, data[33]=0, data[34]=0, data[35]=0, data[36]=0, data[37]=0, data[38]=0, data[39]=0, data[40]=0, data[41]=0, data[42]=126, data[43]=126, data[44]=127, data[45]=127, data[46]=127, data[47]=127, data[48]=127, data[49]=127, data[50]=127, data[51]=127, data[52]=127, data[53]=127, data[54]=127, data[55]=127, data[56]=126, data[57]=126, data[58]=127, data[59]=127, data[60]=127, data[61]=127, data[62]=127, data[63]=126, data[64]=126, data[65]=126, data[66]=126, data[67]=126, data[68]=126, data[69]=126, data[70]=126, data[71]=126, data[72]=126, data[73]=126, data[74]=126, data[75]=126, data[76]=127, data[77]=127, data[78]=127, data[79]=127, data[80]=127, data[81]=127, data[82]=127, data[83]=127, data[84]=127, data[85]=127, data[86]=127, data[87]=127, data[88]=127, data[89]=127, data[90]=127, data[91]=127, data[92]=127, data[93]=127, data[94]=127, data[95]=127, data[96]=127, data[97]=127, data[98]=127, data[99]=127, data[100]=127, data[101]=127, data[102]=127, data[103]=127, data[104]=127, data[105]=127, data[106]=127, data[107]=127, data[108]=127, data[109]=127, data[110]=127, data[111]=127, data[112]=127, data[113]=127, data[114]=127, data[115]=127, data[116]=127, data[117]=127, data[118]=127, data[119]=127, data[120]=127, data[121]=127, data[122]=127, data[123]=127, data[124]=127, data[125]=127, data[126]=127, data[127]=126,

loop 7
data[28]=0, data[29]=0, data[30]=0, data[31]=0, data[32]=0, data[33]=0, data[34]=0, data[35]=0, data[36]=0, data[37]=0, data[38]=0, data[39]=0, data[40]=0, data[41]=0, data[42]=0, data[43]=0, data[44]=0, data[45]=0, data[46]=0, data[47]=0, data[48]=126, data[49]=127, data[50]=127, data[51]=127, data[52]=127, data[53]=127, data[54]=127, data[55]=127, data[56]=126, data[57]=127, data[58]=127, data[59]=127, data[60]=127, data[61]=127, data[62]=127, data[63]=127, data[64]=127, data[65]=127, data[66]=126, data[67]=126, data[68]=126, data[69]=126, data[70]=126, data[71]=126, data[72]=126, data[73]=126, data[74]=126, data[75]=126, data[76]=126, data[77]=126, data[78]=126, data[79]=126, data[80]=126, data[81]=126, data[82]=127, data[83]=127, data[84]=127, data[85]=127, data[86]=127, data[87]=127, data[88]=127, data[89]=127, data[90]=127, data[91]=127, data[92]=127, data[93]=126, data[94]=127, data[95]=127, data[96]=127, data[97]=127, data[98]=126, data[99]=127, data[100]=127, data[101]=127, data[102]=127, data[103]=127, data[104]=127, data[105]=127, data[106]=127, data[107]=127, data[108]=127, data[109]=127, data[110]=127, data[111]=127, data[112]=127, data[113]=127, data[114]=127, data[115]=127, data[116]=127, data[117]=127, data[118]=127, data[119]=127, data[120]=127, data[121]=127, data[122]=127, data[123]=127, data[124]=127, data[125]=127, data[126]=127, data[127]=127,

I (24750) spi_master: Allocate RX buffer for DMA
loop 8
data[28]=0, data[29]=0, data[30]=0, data[31]=0, data[32]=0, data[33]=0, data[34]=0, data[35]=0, data[36]=0, data[37]=0, data[38]=0, data[39]=0, data[40]=0, data[41]=0, data[42]=0, data[43]=0, data[44]=0, data[45]=0, data[46]=0, data[47]=0, data[48]=0, data[49]=0, data[50]=0, data[51]=0, data[52]=0, data[53]=0, data[54]=126, data[55]=127, data[56]=127, data[57]=127, data[58]=127, data[59]=127, data[60]=127, data[61]=127, data[62]=127, data[63]=127, data[64]=127, data[65]=127, data[66]=127, data[67]=127, data[68]=127, data[69]=126, data[70]=127, data[71]=127, data[72]=127, data[73]=126, data[74]=126, data[75]=127, data[76]=126, data[77]=126, data[78]=126, data[79]=126, data[80]=126, data[81]=126, data[82]=126, data[83]=126, data[84]=126, data[85]=127, data[86]=127, data[87]=126, data[88]=127, data[89]=126, data[90]=126, data[91]=127, data[92]=127, data[93]=127, data[94]=127, data[95]=127, data[96]=127, data[97]=127, data[98]=127, data[99]=127, data[100]=127, data[101]=127, data[102]=127, data[103]=127, data[104]=127, data[105]=127, data[106]=127, data[107]=127, data[108]=127, data[109]=127, data[110]=126, data[111]=127, data[112]=127, data[113]=127, data[114]=127, data[115]=127, data[116]=127, data[117]=127, data[118]=127, data[119]=127, data[120]=127, data[121]=127, data[122]=127, data[123]=127, data[124]=127, data[125]=127, data[126]=127, data[127]=127,

loop 9
data[28]=0, data[29]=0, data[30]=0, data[31]=0, data[32]=0, data[33]=0, data[34]=0, data[35]=0, data[36]=0, data[37]=0, data[38]=0, data[39]=0, data[40]=0, data[41]=0, data[42]=0, data[43]=0, data[44]=0, data[45]=0, data[46]=0, data[47]=0, data[48]=0, data[49]=0, data[50]=0, data[51]=0, data[52]=0, data[53]=0, data[54]=0, data[55]=0, data[56]=0, data[57]=0, data[58]=0, data[59]=0, data[60]=126, data[61]=127, data[62]=127, data[63]=127, data[64]=127, data[65]=127, data[66]=127, data[67]=127, data[68]=127, data[69]=127, data[70]=127, data[71]=127, data[72]=127, data[73]=127, data[74]=126, data[75]=126, data[76]=126, data[77]=126, data[78]=126, data[79]=126, data[80]=126, data[81]=126, data[82]=127, data[83]=126, data[84]=126, data[85]=126, data[86]=126, data[87]=127, data[88]=126, data[89]=126, data[90]=126, data[91]=127, data[92]=127, data[93]=126, data[94]=127, data[95]=126, data[96]=127, data[97]=126, data[98]=126, data[99]=127, data[100]=127, data[101]=127, data[102]=127, data[103]=127, data[104]=127, data[105]=127, data[106]=127, data[107]=127, data[108]=127, data[109]=127, data[110]=127, data[111]=127, data[112]=127, data[113]=126, data[114]=126, data[115]=127, data[116]=127, data[117]=127, data[118]=126, data[119]=127, data[120]=127, data[121]=127, data[122]=127, data[123]=127, data[124]=127, data[125]=127, data[126]=127, data[127]=127,
So the first buffers are now full, but since loop 4 I loose data from the left of the buffer...

Any idea?

User avatar
fly135
Posts: 606
Joined: Wed Jan 03, 2018 8:33 pm
Location: Orlando, FL

Re: SPI receive in SPI master, byte shifting in the buffer

Postby fly135 » Sat Apr 27, 2019 3:12 pm

I can't help much, but it seems to me that if you used incrementing numbers instead of random 126/127, then you might be able to determine more precisely what data is being lost, and therefore get closer to the solution.

John A

GG23800
Posts: 4
Joined: Thu Apr 25, 2019 6:41 pm

Re: SPI receive in SPI master, byte shifting in the buffer

Postby GG23800 » Mon Apr 29, 2019 10:10 am

I have made more test, with some knowed data at the beginning of the SPI buffer and I can read it, the data lost are at the end of the buffer

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