TMS570LS1224: Issue of communication between 1224pge and AD7705 over SPI1

Hello Datian,

1. Make sure MibSPI3_CS3 and MibSPI3_CS2 are configured as GIO pins rather than SPI functional pins

2. Use spiTransmitAndReceiveData(...) instead of calling 2 functions: spiTransmitData(), and spiReceiveData().

For SPI communication, only SPI master generates the clock signal. If the slave needs to send data back to master, the master needs to provide a pre-arranged number of clock cycles. 

1. Check DRDY if it is valid

2. If it is low, master provide clock, and read the data

Hello QJ,

Many thanks for your help.

For point 1, I think CS3 and CS2 are configured as GIO, shown as below.

For point 2, I think I need to transmit 4 bytes to set register of AD7705, and 2 bytes from AD7705. I don't know how to deal with different length for the third  argument of spiTransmitAndReceiveData(...). So I used spiTransmitData(), and spiReceiveData(). Would you like to explain more about this suggestion ?

Kind regards

Datïan

Thank you.

I think I use CS3 of mibspiPORT3 to detect DRDY. And I don't know how to check DRDY during call function of spiTransmitAndReceiveData(...).

The code of checking DRDY is like that.

        while(0==ready)
        {
            ready=gioGetBit(mibspiPORT3, PIN_CS3);
        }

        ready=0;

Warm regards

Datïan

Hello QJ,

May I ask to check the signal of clock I probed in the photos ? Do they look good accoding to the setting of VCLK in HalCoGen shown as below ?

Best regards

Datïan

Hello QJ,

I add checking DRDY before calling  spiTransmitAndReceiveData(...) every time.

Thing goes to differently. In the first time of checking, DRDY turns to low. Then DRDY keeps high.

Here is the snapshot of running program. And I know AD7705 expects four bytes by four times for registers, such as

1) 0x20 for "Active Channel is Ain1(+)/Ain1(-), next operation as write to the clock register",

2) 0x0C for "master clock enabled, 4.9512MHz Clock, set output rate to 50Hz",

3) 0x10 for "Active Channel is Ain1(+)/Ain1(-), next operation as write to the setup register",

4) 0x40 for "gain = 1, bipolar mode, buffer off, clear FSYNC and perform a Self Calibration".

But I don't know how to write a byte but a uint by spiTransmitAndReceiveData(...).

Please help me to do better.

Kind regards

Datïan

hello Datïan

could you please share with me your testing code 

between spi1 and spi3

i wrote my code but it's not working fine

hello B.M, 

Sure. Here you are. I'm very glad to know your progress or issues. Good luck.

/* USER CODE BEGIN (0) */
/* USER CODE END */

/* Include Files */

#include "sys_common.h"

/* USER CODE BEGIN (1) */
#include "spi.h"
#include "gio.h"
/* USER CODE END */

/** @fn void main(void)
*   @brief Application main function
*   @note This function is empty by default.
*
*   This function is called after startup.
*   The user can use this function to implement the application.
*/

/* USER CODE BEGIN (2) */
#define DELAY_VALUE 1000000
uint16 TX_Data_Master[16] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10 };
uint16 TX_Data_Slave[16]  = { 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F, 0x20 };
uint16 RX_Data_Master[16] = { 0 };
uint16 RX_Data_Slave[16]  = { 0 };
uint16 cmd=0;
/* USER CODE END */

int main(void)
{
/* USER CODE BEGIN (3) */
    int i;
    spiDAT1_t dataconfig1_t;

    dataconfig1_t.CS_HOLD = FALSE;
    dataconfig1_t.WDEL    = TRUE;
    dataconfig1_t.DFSEL   = SPI_FMT_0;
    dataconfig1_t.CSNR    = 0xFE;

    gioInit();

    /* Enable CPU Interrupt through CPSR */
    _enable_IRQ();

    /* Initialize SPI Module Based on GUI configuration
     * SPI1 - Master ( SIMO, SOMI, CLK, CS0 )
     * SPI3 - Slave  ( SIMO, SOMI, CLK, CS0 )
     * */
    spiInit();

//    spiEnableNotification(spiREG3, 0x0100U);//0x0100 R buffer is full; 0x0200 T buffer is empty

    while(1)
    {
        /* Initiate SPI3 Transmit and Receive through Interrupt Mode */
        spiSendAndGetData(spiREG3, &dataconfig1_t, 16, TX_Data_Slave, RX_Data_Slave);

        /* Initiate SPI1 Transmit and Receive through Polling Mode*/
        spiTransmitAndReceiveData(spiREG1, &dataconfig1_t, 16, TX_Data_Master, RX_Data_Master);

        while(SPI_COMPLETED==SpiRxStatus(spiREG1));

        if(RX_Data_Master[15]==0x20)
        {
            RX_Data_Master[15]=0;
        }
        else
        {
            while(1);
        }

        for(i=0;i<DELAY_VALUE;i++);
    }
/* USER CODE END */

    return 0;
}


/* USER CODE BEGIN (4) */
/** @fn void spiEndNotification(spiBASE_t *spi)
*   @brief Interrupt callback for End of TX or RX data length.
*   @param[in] spi   - Spi module base address
*
* This is a callback that is provided by the application and is called upon
* an interrupt at the End of TX or RX data length.
*/
void spiEndNotification(spiBASE_t *spi)
{
    if(SPI_COMPLETED==SpiRxStatus(spi))
    {
        if(RX_Data_Slave[15]==0X10)
        {
            RX_Data_Slave[15]=0;
            gioToggleBit(gioPORTB, 1);
            return;
        }
       else
       {
           gioSetBit(gioPORTB, 1, 0);
           return;
       }
    }else if(SPI_COMPLETED==SpiTxStatus(spi))
    {
        gioToggleBit(gioPORTB, 2);
        return;
    }
    else
    {
        gioSetBit(gioPORTB, 2, 0);
        return;
    }
}
/* USER CODE END */

Hello  i want to Connect TMS570LS1224 launchpad as spi1 master with microchip dspic33ev256GM106 starter kit as spi slave

I enabled SPI1 driver in SPI1 Global: i enabled master mode and internal clock
In SPI1Data Format: i put 100000 hz baudrate
With 0 polarity and 0 phase
In SPI1Port i enabled SIMO ,MOSI,CLK,CS[0] and ENA as SPI functional
And the other CS[1-5] as GIO
Then generate code I followed spi example code

My first question
1) is it true what i did above?
2) do i need to include these lines in my code?

spiDAT1_t dataconfig1_t;
dataconfig1_t.CS_HOLD = true;
dataconfig1_t.WDEL = true;
dataconfig1_t.DFSEL = SPI_FMT_0 ;
dataconfig1_t.CSNR = SPI_CS_0;

3)do i need to connect power and ground of each board together?

Hi B.M,

For question 1), You test is quite similar to my another test except for ENA. My test is not passed. Here is the url of my post https://e2e.ti.com/support/microcontrollers/hercules/f/312/t/907828.The only different point is.

For 2) dataconfig is necessary, SPI_FMT_0 defines the number of pulse during one time of writing or reading. I defined it by HelCoGen as below.

For question 3), I connected GNDs of my two launchpad although my test mentioned has not yet been success.

Have you tried the test code for two spi modules in your 1224 launchpad ?

i successfully connected spi1 with spi3 

here is the code 

but i still don't know how to make my spi1 as master to connect with microchip as spi slave4426.spi1 master spi3slave final.rar

The communication between SPI1 and SPI2 or 3 is very straightforward. The example in HALCoGen is a good start point.