AIS2120x sensor read data issue

[anandhram1988]

Hi , i am trying to read the sensor data of AIS2120x only for sensor ID type , i can see from the bus the data is transferred correctly, but i don't receive any data back from sensor rather its only 0.

i have attached the code snippet for this test, any leads will be helpful. JHo.1

@JHo.1 and @Eleon BORLINI @CJeff.1 

test 1:

CS_low();

Sensor_Write(0xD1,0x80,ubAisSensor );  // command to read address 0x0C/REG_ID_SENSOR_TYPE from AIS2120x

                                            // according to 32 byte cmmand format                                 Sensor_Write(0x00,ubCrcVal,ubAisSensor );  

CS_high();

Test 2:

CS_low();

Sensor_Write(0x8C,0x00,ubAisSensor ); // command to read address 0x0C/REG_ID_SENSOR_TYPE      from AIS2120x

set_high();

//Sensor interface 

void Sensor_Write(uint8 addr, uint8 Data,(uint8 Sensor) {

 // application specific

spi_Write(addr);

delay();

spi_Write(Data);

}

//receive ISR

uint8 ubSpiStatus;

uint8 RxData;

_INTERRUPT_VOID SPI_vRxISR (void)

{

if(SPIS==0xA0)

{

RxData = SPID;

ubSpiStatus = 1;

}

}

spi_Write(uint8 addr, uint8 Data,uint8 ubAisSensor)

{

while (!(SPIS)); // Wait until transmit buffer is empty

SPID = data;

while(!ubSpiStatus);

ubSpiStatus = 0;

while (!(SPIS)); // Wait until transmit buffer is empty

SPID = data;

while(!ubSpiStatus);

ubSpiStatus = 0;

appl(RxData); //evaluate data

}

i use nxp 8 bit mcu : MC9S08SH32

MCU is 5v output, level shifter used between MCU and sensor to downgrade voltage to 3V3 ,

[anandhram1988]

i have edited the code now(test), i cannot paste the appl code. sorry for that

from the schematic, 5v fixed is provided hence not tried without levelshifter and 3,3 mcu operating voltage

I would like to have below information:

commands to be written into spi for getting response form sensor.

[Andrew Neil]

Again, you haven't formatted the code.

I'm out.

[anandhram1988]

  volatile UB__8 ubAisRxData;
  volatile UB__8 ubSpiStatus = 0;

void SPI_vInit(void) {


	disable_interrupts();
    configure_D_OUT_SPI_MOSI_Pin();   // PTBDD_PTBDD5 = 1; // MOSI
    configure_D_IN_SPI_MISO_Pin();   //PTBDD_PTBDD4 = 0; // MISO
    configure_D_OUT_SPI_CLK_Pin(); // PTBDD_PTBDD6 = 1; // SCK
    set_CS1_high(); // Sensor 1 disable
    set_CS2_high(); // Sensor 2 disable


    // SPI Control Register 1
    SPIC1 = 0xD4; // SPE=1, MSTR=1, SSOE=0, CPOL=0, CPHA=0, SPIE=1
    //SPIC1 = 0xF0; // SPE=1, MSTR=1, SSOE=0, CPOL=0, CPHA=0, SPIE=1

    // SPI Control Register 2
    SPIC2 = 0x00;

    // SPI Baud Rate Register (set to suitable speed)
    //SPIBR = 0x10; // Divide bus clock  16 Mhz, spi clock 5,33Mhz
    SPIBR = 0x11; // Divide bus clock  16 Mhz, spi clock 4 Mhz

    // Clear status flags by reading SPIS and SPID
    (void)SPIS;
    (void)SPID;
    enable_interrupts();

}

void SPI_vSendByte(UB__8 ubSpiTransfer, UB__8 ubSpiChannel)
{
	volatile UB__8 ubAisStatus;
	volatile UB__8 ubAisRx;

    while (!(SPIS)); // Wait until transmit buffer is empty

    SPID = ubSpiTransfer;

    while(!ubSpiStatus);
    ubSpiStatus = 0;

}




_INTERRUPT_VOID SPI_vTransferISR (void)
{
	if(SPIS==0xA0)
	{
		ubAisRxData = SPID;
		ubSpiStatus = 1;
	}

}



UB__8 AIS1120SX_ubSensorConfig(UB__8 ubAisSensor)
{
	UW_16 readVal;
	UB__8 retVal = 0;
	UB__8 ubCrcVal;
	UW_16 delay;


	ubCrcVal = AIS1120SX_ubCrcVal (0xE18000); // to read 0c0C register from sensor Sensor type Val

	set_CS1_low();
	for(delay =0; delay < 10; delay++);
	AIS1120SX_vWrite(0xE1,0x80,ubAisSensor );  // REG_CONFIG  FIR is 1600 for X,Y and
	                               //no ofset cancellation
	AIS1120SX_vWrite(0x00,ubCrcVal,ubAisSensor );  // REG_CONFIG  FIR is 1600 for X,Y and

//	AIS1120SX_vWrite(0x8D,0x00,ubAisSensor );
//	for(delay =0; delay < 10; delay++);
//	AIS1120SX_vWrite(0x00,0x00,ubAisSensor );
	set_CS1_high();


	return retVal;
}




void AIS1120SX_vWrite(UB__8 ubAis_addr, UB__8 ubAisData,UB__8 ubAisSensor) {

	UW_16 delay;

	SPI_vSendByte(ubAis_addr, ubAisSensor);

	SPI_vSendByte(ubAisData, ubAisSensor);

}
UB__8 AIS1120SX_ubCrcVal(UL_32 ulCrcVal) {

	UB__8 crc = 0x00;
	UB__8 poly = 0x97;
	//UL_32 poly = 0x12F;
	UB__8 i;
	UB__8 b;
    // Process only the top 3 bytes of data24 (ignoring the lowest byte)

    for (i = 0; i<3; i++)
    {
       crc ^= (UB__8)((ulCrcVal >> (i * 8)));

       for (b = 0; b < 8; b++)
       {
           if (crc & 0x80)
           {
              crc = (UB__8)((crc << 1) ^ poly);
           }
           else
           {
              crc <<= 1;
           }
       }
    }


	   return crc;

}

[anandhram1988]

@Andrew Neil  this is the complete code after formatting and actual tested version

please look :)

[anandhram1988]

@Andrew Neil could you please support, i am really blocked

[Andrew Neil]

I given you all the suggestions I have.

[anandhram1988]

i have also tried with 3.3V MCU inputs problem is still same