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[/] [openrisc/] [trunk/] [orpsocv2/] [sw/] [tests/] [uart/] [sim/] [uart-interrupt.c] - Diff between revs 397 and 431

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/*
/*
 * UART interrupt test
 * UART interrupt test
 *
 *
 * Tests UART and interrupt routines servicing them.
 * Tests UART and interrupt routines servicing them.
 *
 *
 * Relies on testbench having uart0's lines in loopback (rx = tx)
 * Relies on UART 0 receiving external stimulus.
 *
 *
 * Julius Baxter, julius.baxter@orsoc.se
 * Julius Baxter, julius.baxter@orsoc.se
 *
 *
*/
*/
 
 
 
 
#include "cpu-utils.h"
#include "cpu-utils.h"
#include "spr-defs.h"
#include "spr-defs.h"
#include "board.h"
#include "board.h"
#include "uart.h"
#include "uart.h"
 
#include "printf.h"
#include "int.h"
#include "int.h"
#include "orpsoc-defines.h"
#include "orpsoc-defines.h"
 
 
#ifndef UART0
#ifndef UART0
# error
# error
# error UART0 missing and is required for UART interrupt (loopback) test
# error UART0 missing and is required for UART interrupt (loopback) test
# error
# error
#endif
#endif
 
 
 
 
 
#define UART_TX_BUF_MAX 256
struct uart_tx_ctrl
struct uart_tx_ctrl
{
{
  char *bufptr;
  char buf[UART_TX_BUF_MAX]; /* 256byte buffer to print */
  int busy;
  int buf_count;
 
  int tx_count;
};
};
 
 
volatile struct uart_tx_ctrl uart0_tx_ctrl;
volatile struct uart_tx_ctrl uart0_tx_ctrl;
 
 
 
 
 
/* Reset buffer counter */
 
void uart0_tx_buffer_init(void)
 
{
 
  uart0_tx_ctrl.buf_count = 0;
 
  uart0_tx_ctrl.tx_count = 0;
 
}
 
 
 
/* Add characters to be transmitted */
 
void uart0_tx_buffer_add(int numchars, char* buf)
 
{
 
  // If we're not currently transmitting, ie. nothign in the buffer, then
 
  // we should transmit after this.
 
  int start_tx = (numchars && !uart0_tx_ctrl.buf_count);
 
  while(numchars)
 
    {
 
      /* Not good if this gets used outside of interrupt. */
 
      uart0_tx_ctrl.buf[uart0_tx_ctrl.buf_count%UART_TX_BUF_MAX] = *buf++;
 
      uart0_tx_ctrl.buf_count++;
 
      numchars--;
 
    }
 
 
 
  if (start_tx)
 
    {
 
      uart_txint_enable(0);
 
      uart_putc_noblock(0, uart0_tx_ctrl.buf[uart0_tx_ctrl.tx_count%UART_TX_BUF_MAX]);
 
      uart0_tx_ctrl.tx_count++;
 
    }
 
}
 
 
 
 
void uart_int_handler(void* corenum);
void uart_int_handler(void* corenum);
 
 
void uart_int_handler(void* corenum)
void uart_int_handler(void* corenum)
{
{
 
 
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    uart_get_lsr(core); // Should clear this interrupt
    uart_get_lsr(core); // Should clear this interrupt
  else if ( (iir & UART_IIR_RDI) == UART_IIR_RDI )
  else if ( (iir & UART_IIR_RDI) == UART_IIR_RDI )
    {
    {
      // Was potentially also a timeout. Do we care?
      // Was potentially also a timeout. Do we care?
 
 
      // Data received. Pull all from the FIFO buffer, here we just report it
      // Data received. Pull from the fifo and echo back.
      // and throw it away
 
      char rxchar;
      char rxchar;
      while (uart_check_for_char(core))
      while (uart_check_for_char(core))
        {
        {
 
 
          rxchar = uart_getc(core);
          rxchar = uart_getc(core);
          report(0xff & rxchar);
          report(0xff & rxchar);
 
          //printf("RX char: %c\n",rxchar);
 
          uart0_tx_buffer_add(1, &rxchar);
 
 
          if (rxchar == 0x2a) // Exit simulation when RX char is '*'
          if (rxchar == 0x2a) // Exit simulation when RX char is '*'
            exit(0x8000000d);
            {
 
              report(0x8000000d);
 
              exit(0);
 
            }
        }
        }
    }
    }
  else if ( (iir & UART_IIR_THRI) ==  UART_IIR_THRI)
  else if ( (iir & UART_IIR_THRI) ==  UART_IIR_THRI)
    {
    {
      // Only trigered if we've set something to be transmitted
      // Only trigered if we've set something to be transmitted
      // and enabled the interrupt.
      // and enabled the interrupt.
      // Put next thing to be transmitted into buffer, check if it's
      // Put next thing to be transmitted into buffer, check if it's
      // the last, if so, disable interrupts.
      // the last, if so, disable interrupts.
      if (uart0_tx_ctrl.bufptr[0] == 0) // EOL, disable interrupt after this char
      if (uart0_tx_ctrl.buf_count == uart0_tx_ctrl.tx_count)
        {
        {
          uart_txint_disable(core);
          uart_txint_disable(core);
          uart0_tx_ctrl.busy = 0;
 
        }
        }
      else // Transmit this byte
      else // Transmit this byte
        {
        {
          uart_putc_noblock(core, uart0_tx_ctrl.bufptr[0]);
          uart_putc_noblock(0, uart0_tx_ctrl.buf[uart0_tx_ctrl.tx_count%UART_TX_BUF_MAX]);
          uart0_tx_ctrl.bufptr++;
          uart0_tx_ctrl.tx_count++;
        }
        }
    }
    }
  else if ( (iir & UART_IIR_MSI) == UART_IIR_MSI )
  else if ( (iir & UART_IIR_MSI) == UART_IIR_MSI )
    {
    {
      // Just read the modem status register to clear this
      // Just read the modem status register to clear this
      uart_get_msr(core);
      uart_get_msr(core);
    }
    }
}
}
 
 
 
 
void uart0_tx_buffer(char* buf)
 
{
 
  while (uart0_tx_ctrl.busy); // Wait until we can transmit more
 
  uart0_tx_ctrl.bufptr = buf;
 
  uart0_tx_ctrl.busy = 1;
 
  uart_txint_enable(0);
 
}
 
 
 
int main()
int main()
{
{
  int uart0_core = 0;
  int uart0_core = 0;
  int uart1_core = 1;
  int uart1_core = 1;
  uart0_tx_ctrl.busy = 0;
 
 
 
  /* Set up interrupt handler */
  /* Set up interrupt handler */
  int_init();
  int_init();
 
 
  /* Install UART core 0 interrupt handler */
  /* Install UART core 0 interrupt handler */
Line 109... Line 139...
 
 
  /* Enable interrupts in supervisor register */
  /* Enable interrupts in supervisor register */
  mtspr (SPR_SR, mfspr (SPR_SR) | SPR_SR_IEE);
  mtspr (SPR_SR, mfspr (SPR_SR) | SPR_SR_IEE);
 
 
  uart_init(uart0_core);
  uart_init(uart0_core);
  //uart_init(uart1_core);
 
 
 
  //uart_rxint_enable(uart1_core);
 
  uart_rxint_enable(uart0_core);
  uart_rxint_enable(uart0_core);
 
 
  char* teststring = "\n\tHello world from UART 0\n\0";
  uart0_tx_buffer_init();
 
 
  uart0_tx_buffer(teststring);
 
 
 
  // Do other things while we transmit
 
  float f1, f2, f3; int i;
 
  f1 = 0.2382; f2 = 4342.65; f3=0;
 
  for(i=0;i<32;i++) f3 += f1*f3 + f2;
 
 
 
  report(f3);
 
  report(0x4aaaaa1f);
 
 
 
  char* done_calculating = "\tDone with the number crunching!\n\0";
 
 
 
  uart0_tx_buffer(done_calculating);
 
 
 
  // Character '*', which will be received in the interrupt handler and cause
 
  // the simulation to exit.
 
  char* finish = "*\n\0";
 
 
 
  uart0_tx_buffer(finish);
  printf("\n\tUART interrupt test.\n");
 
  printf("\n\tType to see characters echoed\n");
 
 
  while(1); // will exit in the rx interrupt routine
  while(1); // will exit in the rx interrupt routine
 
 
}
}
 
 
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