Hello together, a have got a question. I have a system which is communicating over USB using SCI-A, works fine. Now I wanted to use SCI-B for the RS485 communication. Sofar I understood, there are no differences between SCI-A and SCI-B except the one runs on "SciaRegs" and the other on "ScibRegs". Therefore, I have just changed the registers from "SciaRegs" to "ScibRegs" everywhere in the code. I have also deactivated RX/TX GPIOs of SCIA and activated RX/TX GPIOs of SCIB, but somhow I still cant get any transmission over my RS485 interface. Are there any other differences to be considered?
my initialization, "SCI_REG_A" is defined and can be changed to "SciaRegs" or "ScibRegs",
void scia_fifo_init()
{
SCI_REG_A.SCIFFTX.all=0xE040; //SCI_FIFO transmit register
SCI_REG_A.SCIFFRX.all=0x204f; //SCI_FIFO receive register
SCI_REG_A.SCIFFCT.all=0x0; //SCI_FIFO control register
}
void scia_echoback_init()
{
SCI_REG_A.SCICCR.all =0x0007; // 1 stop bit, No loopback
// No parity,8 char bits,
// async mode, idle-line protocol
SCI_REG_A.SCICTL1.all =0x0003; // enable TX, RX, internal SCICLK,
// Disable RX ERR, SLEEP, TXWAKE
SCI_REG_A.SCICTL2.all =0x0003;
SCI_REG_A.SCICTL2.bit.TXINTENA =1;//enable TX interrupt caused by TXRDY flag
SCI_REG_A.SCICTL2.bit.RXBKINTENA =1;//enable RX interrupt caused by RXRDY flag or the BRKDT flag
SCI_REG_A.SCIHBAUD =0x0000;
SCI_REG_A.SCILBAUD = 0x001B; // 1Bh = 115.2Kbaud @ LSPCLK = 100/4 MHz
SCI_REG_A.SCICTL1.all =0x0023; // Relinquish SCI from Reset
}
//deactivate SCI-A GPIOs and activate SCI-B GPIOs
void comm_adjustment_init(void)
{
EALLOW;
//--------------------------------------------------------------------------------------
// GPIO-09 - PIN FUNCTION = --Spare--
GpioCtrlRegs.GPAMUX1.bit.GPIO9 = 2; // 0=GPIO, 1=EPWM5B, 2=SCITX-B, 3=ECAP3
// GpioCtrlRegs.GPADIR.bit.GPIO9 = 0; // 1=OUTput, 0=INput
// GpioDataRegs.GPACLEAR.bit.GPIO9 = 1; // uncomment if --> Set Low initially
// GpioDataRegs.GPASET.bit.GPIO9 = 1; // uncomment if --> Set High initially
//--------------------------------------------------------------------------------------
// GPIO-11 - PIN FUNCTION = --Spare--
GpioCtrlRegs.GPAMUX1.bit.GPIO11 = 2; // 0=GPIO, 1=EPWM6B, 2=SCIRX-B, 3=ECAP4
// GpioCtrlRegs.GPADIR.bit.GPIO11 = 0; // 1=OUTput, 0=INput
// GpioDataRegs.GPACLEAR.bit.GPIO11 = 1; // uncomment if --> Set Low initially
// GpioDataRegs.GPASET.bit.GPIO11 = 1; // uncomment if --> Set High initially
//--------------------------------------------------------------------------------------
// GPIO-21 - PIN FUNCTION = --Spare--
GpioCtrlRegs.GPAMUX2.bit.GPIO21 = 0; // 0=GPIO, 1=EQEPB-1, 2=SPISOMI-C, 3=CANRX-B
GpioCtrlRegs.GPADIR.bit.GPIO21 = 1; // 1=OUTput, 0=INput
// GpioDataRegs.GPACLEAR.bit.GPIO21 = 1; // uncomment if --> Set Low initially
GpioDataRegs.GPASET.bit.GPIO21 = 1; // uncomment if --> Set High initially
//--------------------------------------------------------------------------------------
//--------------------------------------------------------------------------------------
// GPIO-28 - PIN FUNCTION = SCI-RX
GpioCtrlRegs.GPAMUX2.bit.GPIO28 = 0; // 0=GPIO, 1=SCIRX-A, 2=Resv, 3=TZ5
GpioCtrlRegs.GPADIR.bit.GPIO28 = 0; // 1=OUTput, 0=INput
// GpioDataRegs.GPACLEAR.bit.GPIO28 = 1; // uncomment if --> Set Low initially
// GpioDataRegs.GPASET.bit.GPIO28 = 1; // uncomment if --> Set High initially
//--------------------------------------------------------------------------------------
// GPIO-29 - PIN FUNCTION = SCI-TX
GpioCtrlRegs.GPAMUX2.bit.GPIO29 = 0; // 0=GPIO, 1=SCITXD-A, 2=Resv, 3=TZ6
GpioCtrlRegs.GPADIR.bit.GPIO29 = 0; // 1=OUTput, 0=INput
// GpioDataRegs.GPACLEAR.bit.GPIO29 = 1; // uncomment if --> Set Low initially
// GpioDataRegs.GPASET.bit.GPIO29 = 1; // uncomment if --> Set High initially
//--------------------------------------------------------------------------------------
EDIS; // Disable register access
}
thx,
bye
