hello,

i use the r32c111 starter kit and i want to use the txd4,rxd4 and clk 4 to communicate via spi. i initialize the ports but no clock signals come out of clk4

the initializing is like this

/*””FUNC COMMENT””**************************************************************
* Outline   : SPI_Master_init
* Description  : Configures UART4 in transmit mode
* Argument   : none
* Return value  : none
*””FUNC COMMENT END””**********************************************************/

void SPI_Master_init(void)
{
/* Configure pin p9_5 as follows - CLK4, Output pin   */
pd9_5 = 1;
p9_5s = 0x3;

/* Configure pin p9_7 as follows - RXD4, Input pin   */
pd9_7 = 0;

/* Configure pin p6_3 as follows - TXD4, Output pin   */
pd9_6 =  1;
p9_6s = 0x3;

/* Configure pin p9_4 as follows - Output port pin (to select slave device) */
p9_4 = 0;
pd9_4 = 1;
p9_4s = 0;
 
/* Set master clock bit rate. Please refer to the macro BIT_RATE in the
    header file for actual bit rate  */
u4brg = (unsigned char)(((f1_CLK_SPEED)/(2*BIT_RATE))-1);

/* UART4 transmit/receive mode register
   b2:b0 - SMD2:SMD0  - 001 (serial synchronous interface mode selected)
      b3 - CKDIR   - 0 (Internal clock selected)
      b4 - STPS   - 0 (1 Stop bit)
      b5 - PRY   - 0 (No parity used)
      b6 - PRYE   - 0 (No parity used)
     b7 - IOPOL   - 0 (TXD, RXD polarity not inverted)  */
 
u4mr = 0x01;
   
/* UART0 transmit/receive control register 0
   b1:b0 - CLK01:CLK0 - 00 (U0BRG count source select bits -f1 selected)
      b2  - CRS    - 0 (CTS/RTS function select bit (Set to 0))
     b3 - TXEPT   - 0 (Clear transmit register empty flag)
      b4 - CRD   - 1 (Disable CTS/RTS function)
      b5 - NCH   - 0 (N-channel open drain output selected)
      b6 - CKPOL   - 1 (Transmit data is output at the rising edge of
           transmit/receive clock and receive data is input at
         the falling edge.
     b7 - UFORM   - 1 (MSB first selected) */
 
   u4c0 = 0xd0;
   
    u4brg = (unsigned char)(((f1_CLK_SPEED)/(2*BIT_RATE))-1);

/* UART0 transmit/receive control register 1
      b0  - TE  - 1 (Enable transmission)
   b1  - TI   - 0 (Clear the 'transmit buffer empty' flag)
   b2  - RE   - 1 (Enable reception)
   b3  - RI  - 0 (Clear the 'Receive complete' flag)
   b4  - UiIRS     - 0
   b5 - UiRRM  - 1 (Use continuous receive )
   b7:b6 - Reserved - 00 (Set to 00) */
 
   u4c1 = 0x25; 

/* Unused in synchronous serial mode. Set to 0. */
u4smr = 0x00;

/* Unused in synchronous serial mode. Set to 0. */
u4smr2 = 0x00;

/* UART4 Special Mode Register 3
    b0  SSE   -1 (SS0n pin enabled)  
    b1  CKPH   -0 (No delayed clock)
    b2  DINC  -0 (set to 0 in master mode)
    b3  NODC   -0 (CLKi pin in N-channel open drain output)
    b4   ERR   -0 (set to 0 )
    b7:b5  DL2:DL0  -000 (Select as 0 in serial synchronous mode) */
   
u4smr3 = 0x09;

/* Unused in synchronous serial mode. Set to 0. */
u4smr4 = 0x00;

/* Disable interrupts */
DISABLE_IRQ

/* Interrupt Control Register for UART0 transmit
b2:b0  - ILVL2:ILVL0  - 011 (Interrupt priority 3 selected for UART0
           transmit)
b3   - IR    - 0 (Interrupt request bit. Set to 0)
b4   - POL    - 0 (Polarity select bit. Set to 0.) 
b5   - Reserved  - 0
b7:b6  - Reserved  - 0   */
 
s4tic = 0x03;

/* Enable interrupts */
ENABLE_IRQ


}

so i write to the txd4 in a loop

/* This loop should never exit.  */
while (1)
{
     //p9_5 = 0;
  //for (ucLoopcnt=0; ucLoopcnt<sizeof(c_data); ucLoopcnt++)
     {
     
   while(ti_u4c1 == 0)
      {
       /* Wait for previous transmission to complete */
      }    

       /* Load the data to be transmitted, in the transmit buffer */
      //u4tb = (short) c_data[ucLoopcnt];
   u4tb = 0xAA;
   //pd9_5 = 1;
   //p9_5 = 1;
  
      }
};

no clock signal come out of port clk4.

i hope anyone can help me to solve the problem

regards

knut