Need help with SPI configuration - data is not getting transmitted

sjpatel19922 2017-04-07

Posted on April 07, 2017 at 20:38 Hello, I would like to know what is wrong with my current configuration of SPI module. I can see data in the TX FIFO, but its not getting transmitted. I am using the SPC570S40E1 microcontroller. SPI Port Configuration void Initialize_SPI_Port(void) { // Using DSPI 0 // DSPI0_CS -- PA[0] , Pin #2, PAD[0] SIUL2.MSCR_IO[0].B.SSS = PAL_SPC5_SSS(1); // DSPI0_SCK -- PA[3] , Pin #3, PAD[3] SIUL2.MSCR_IO[3].B.SSS = PAL_SPC5_SSS(1); // DSPI0_MISO -- PA[4], Pin #4, PAD[4] SIUL2.MSCR_IO[4].B.IBE = 1; SIUL2.MSCR_MUX[624-512].R = PAL_SPC5_SSS(1); // DSPI0_MOSI -- PA[7], Pin #5, PAD[7] SIUL2.MSCR_IO[7].B.SSS = PAL_SPC5_SSS(1); } ?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? SPI Module conffiguration void Initialize_DSPI0(void) { // Configure DSPI0 Module Configuration Register ( DSPI0_MCR ) // MSTR - 0 , Master mode // CONT_SCKE - 0 , Continuous SCK disabled // DCONF - 00 , SPI // FRZ - 0 , Do not halt serial transfers in debug mode // MTFE - 0 , Modified Timing Format disabled // ROOE - 0 , (Receive FIFO Overflow Overwrite) Incoming data is ignored // PCSIS0 - 1 , Inactive state of PCS0 is high // MDIS - 1 , Allow external logic to disable DSPI clocks // DIS_TXF - 0 , TX FIFO enabled // DIS_RXF - 0 , RX FIFO enabled // XSPI - 0 , Normal SPI Mode // FCPCS - 1 , Fast Continuous PCS mode. // PES - 0 , SPI frame transmission continues // HALT - 0 , Start transfers DSPI_0.MCR.R = 0x10004; // Configure CTAR0 and CTAR1 ( Clock and Transfer Attributes ) Register // Two transfer attributes used. CTAR0 configured for 16-bit frame size. CTAR1 configured for 8-bit frame size. // DBR - 0 , Baud rate not doubled // FMSZ(for CTAR0) - 1111 , Frame size set to FMSZ + 1 or 16 bits // CPOL - 0 , Clock Polarity - Inactive state value of SCK is low // CPHA - 0 , Data is captured on the leading edge of SCK and changed on the following edge // LSBFE - 0 , MSB is transferred first // PCSSCK - 00 , PCS to SCK Prescaler value is 1 // PASC - 00 , Sets the delay between last SCK edge to negation of CS, 00 sets the Prescaler value to 1 // PDT - 00 , Sets the delay between negation of PCS at end of frame to assertion beginning of next frame, 00 - Prescaler set to 1 // PBR - 00 , Baud Rate Prescaler, set to 2. Available values - 2,3,5, and 7 // CSSCK - 0000 , PCS to SCK Delay Scaler set to 2 // ASC - 0000 , Scaler value for the After SCK Delay, set to 2 // DT - 0000 , Scaler value set to 2 // BR - 0011 , Baud Rate scaler set to 8 /* ------------ Calculation ------------------------ SPI Baud Rate = (Fp / PBR) * ( [1 + DBR]/BR ) , Fp = Peripheral Clock / AC0_DC3 = 64/1 = 64Mhz = (64/2) * ( [1]/8 ) = 64/16 = 4Mhz */ DSPI_0.CTAR[0].R = 0x78000003; DSPI_0.CTAR[1].R = 0x38000003; }???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? #spc570s #spi

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Posted on April 07, 2017 at 22:59 Figured out what the problem was. I didn't realize I had it configured as a slave device.