Marlin_Firmware/Marlin/src/HAL/HAL_LPC1768/HardwareSerial.cpp

/**
 * Marlin 3D Printer Firmware
 * Copyright (C) 2016 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
 *
 * Based on Sprinter and grbl.
 * Copyright (C) 2011 Camiel Gubbels / Erik van der Zalm
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#ifdef TARGET_LPC1768

#include "../../core/macros.h"
#include "../HAL.h"
#include "HardwareSerial.h"
#define UART3 3
HardwareSerial Serial3 = HardwareSerial(UART3);

volatile uint32_t UART0Status, UART1Status, UART2Status, UART3Status;
volatile uint8_t UART0TxEmpty = 1, UART1TxEmpty = 1, UART2TxEmpty=1, UART3TxEmpty=1;
volatile uint8_t UART0Buffer[UARTRXQUEUESIZE], UART1Buffer[UARTRXQUEUESIZE], UART2Buffer[UARTRXQUEUESIZE], UART3Buffer[UARTRXQUEUESIZE];
volatile uint32_t UART0RxQueueWritePos = 0, UART1RxQueueWritePos = 0, UART2RxQueueWritePos = 0, UART3RxQueueWritePos = 0;
volatile uint32_t UART0RxQueueReadPos = 0, UART1RxQueueReadPos = 0, UART2RxQueueReadPos = 0, UART3RxQueueReadPos = 0;
volatile uint8_t dummy;

  void HardwareSerial::begin(uint32_t baudrate) {
    uint32_t Fdiv;
     uint32_t pclkdiv, pclk;

     if ( PortNum == 0 )
     {
   	LPC_PINCON->PINSEL0 &= ~0x000000F0;
   	LPC_PINCON->PINSEL0 |= 0x00000050;  /* RxD0 is P0.3 and TxD0 is P0.2 */
   	/* By default, the PCLKSELx value is zero, thus, the PCLK for
   	all the peripherals is 1/4 of the SystemFrequency. */
   	/* Bit 6~7 is for UART0 */
   	pclkdiv = (LPC_SC->PCLKSEL0 >> 6) & 0x03;
   	switch ( pclkdiv )
   	{
   	  case 0x00:
   	  default:
   		pclk = SystemCoreClock/4;
   		break;
   	  case 0x01:
   		pclk = SystemCoreClock;
   		break;
   	  case 0x02:
   		pclk = SystemCoreClock/2;
   		break;
   	  case 0x03:
   		pclk = SystemCoreClock/8;
   		break;
   	}

       LPC_UART0->LCR = 0x83;		/* 8 bits, no Parity, 1 Stop bit */
   	Fdiv = ( pclk / 16 ) / baudrate ;	/*baud rate */
       LPC_UART0->DLM = Fdiv / 256;
       LPC_UART0->DLL = Fdiv % 256;
   	LPC_UART0->LCR = 0x03;		/* DLAB = 0 */
       LPC_UART0->FCR = 0x07;		/* Enable and reset TX and RX FIFO. */

      	NVIC_EnableIRQ(UART0_IRQn);

       LPC_UART0->IER = IER_RBR | IER_THRE | IER_RLS;	/* Enable UART0 interrupt */
     }
     else if ( PortNum == 1 )
     {
   	LPC_PINCON->PINSEL4 &= ~0x0000000F;
   	LPC_PINCON->PINSEL4 |= 0x0000000A;	/* Enable RxD1 P2.1, TxD1 P2.0 */

   	/* By default, the PCLKSELx value is zero, thus, the PCLK for
   	all the peripherals is 1/4 of the SystemFrequency. */
   	/* Bit 8,9 are for UART1 */
   	pclkdiv = (LPC_SC->PCLKSEL0 >> 8) & 0x03;
   	switch ( pclkdiv )
   	{
   	  case 0x00:
   	  default:
   		pclk = SystemCoreClock/4;
   		break;
   	  case 0x01:
   		pclk = SystemCoreClock;
   		break;
   	  case 0x02:
   		pclk = SystemCoreClock/2;
   		break;
   	  case 0x03:
   		pclk = SystemCoreClock/8;
   		break;
   	}

       LPC_UART1->LCR = 0x83;		/* 8 bits, no Parity, 1 Stop bit */
   	Fdiv = ( pclk / 16 ) / baudrate ;	/*baud rate */
       LPC_UART1->DLM = Fdiv / 256;
       LPC_UART1->DLL = Fdiv % 256;
   	LPC_UART1->LCR = 0x03;		/* DLAB = 0 */
       LPC_UART1->FCR = 0x07;		/* Enable and reset TX and RX FIFO. */

      	NVIC_EnableIRQ(UART1_IRQn);

       LPC_UART1->IER = IER_RBR | IER_THRE | IER_RLS;	/* Enable UART1 interrupt */
     }
     else if ( PortNum == 2 )
     {
   	  //LPC_PINCON->PINSEL4 &= ~0x000F0000;  /*Pinsel4 Bits 16-19*/
   	  //LPC_PINCON->PINSEL4 |=  0x000A0000;  /* RxD2 is P2.9 and TxD2 is P2.8, value 10*/
   	  LPC_PINCON->PINSEL0 &= ~0x00F00000;  /*Pinsel0 Bits 20-23*/
   	  LPC_PINCON->PINSEL0 |=  0x00500000;  /* RxD2 is P0.11 and TxD2 is P0.10, value 01*/

   	  LPC_SC->PCONP |= 1<<24; //Enable PCUART2
   	  /* By default, the PCLKSELx value is zero, thus, the PCLK for
   		all the peripherals is 1/4 of the SystemFrequency. */
   	  /* Bit 6~7 is for UART3 */
   	  pclkdiv = (LPC_SC->PCLKSEL1 >> 16) & 0x03;
   	  switch ( pclkdiv )
   	  {
   	  case 0x00:
   	  default:
   		  pclk = SystemCoreClock/4;
   		  break;
   	  case 0x01:
   		  pclk = SystemCoreClock;
   		  break;
   	  case 0x02:
   		  pclk = SystemCoreClock/2;
   		  break;
   	  case 0x03:
   		  pclk = SystemCoreClock/8;
   		  break;
   	  }
   	  LPC_UART2->LCR = 0x83;		/* 8 bits, no Parity, 1 Stop bit */
   	  Fdiv = ( pclk / 16 ) / baudrate ;	/*baud rate */
   	  LPC_UART2->DLM = Fdiv / 256;
   	  LPC_UART2->DLL = Fdiv % 256;
   	  LPC_UART2->LCR = 0x03;		/* DLAB = 0 */
   	  LPC_UART2->FCR = 0x07;		/* Enable and reset TX and RX FIFO. */

   	  NVIC_EnableIRQ(UART2_IRQn);

   	  LPC_UART2->IER = IER_RBR | IER_THRE | IER_RLS;	/* Enable UART3 interrupt */
     }
     else if ( PortNum == 3 )
     {
   	  LPC_PINCON->PINSEL0 &= ~0x0000000F;
   	  LPC_PINCON->PINSEL0 |=  0x0000000A;  /* RxD3 is P0.1 and TxD3 is P0.0 */
   	  LPC_SC->PCONP |= 1<<4 | 1<<25; //Enable PCUART1
   	  /* By default, the PCLKSELx value is zero, thus, the PCLK for
   		all the peripherals is 1/4 of the SystemFrequency. */
   	  /* Bit 6~7 is for UART3 */
   	  pclkdiv = (LPC_SC->PCLKSEL1 >> 18) & 0x03;
   	  switch ( pclkdiv )
   	  {
   	  case 0x00:
   	  default:
   		  pclk = SystemCoreClock/4;
   		  break;
   	  case 0x01:
   		  pclk = SystemCoreClock;
   		  break;
   	  case 0x02:
   		  pclk = SystemCoreClock/2;
   		  break;
   	  case 0x03:
   		  pclk = SystemCoreClock/8;
   		  break;
   	  }
   	  LPC_UART3->LCR = 0x83;		/* 8 bits, no Parity, 1 Stop bit */
   	  Fdiv = ( pclk / 16 ) / baudrate ;	/*baud rate */
   	  LPC_UART3->DLM = Fdiv / 256;
   	  LPC_UART3->DLL = Fdiv % 256;
   	  LPC_UART3->LCR = 0x03;		/* DLAB = 0 */
   	  LPC_UART3->FCR = 0x07;		/* Enable and reset TX and RX FIFO. */

   	  NVIC_EnableIRQ(UART3_IRQn);

   	  LPC_UART3->IER = IER_RBR | IER_THRE | IER_RLS;	/* Enable UART3 interrupt */
     }
  }

  int HardwareSerial::read() {
    uint8_t rx;
  	if ( PortNum == 0 )
  	  {
  		  if (UART0RxQueueReadPos == UART0RxQueueWritePos)
  		    return -1;

  		  // Read from "head"
  		  rx = UART0Buffer[UART0RxQueueReadPos]; // grab next byte
  		  UART0RxQueueReadPos = (UART0RxQueueReadPos + 1) % UARTRXQUEUESIZE;
  		  return rx;
  	  }
  	  if ( PortNum == 1 )
  	  {
  		  if (UART1RxQueueReadPos == UART1RxQueueWritePos)
  		    return -1;

  		  // Read from "head"
  		  rx = UART1Buffer[UART1RxQueueReadPos]; // grab next byte
  		  UART1RxQueueReadPos = (UART1RxQueueReadPos + 1) % UARTRXQUEUESIZE;
  		  return rx;
  	  }
  	  if ( PortNum == 2 )
  	  {
  		  if (UART2RxQueueReadPos == UART2RxQueueWritePos)
  		    return -1;

  		  // Read from "head"
  		  rx = UART2Buffer[UART2RxQueueReadPos]; // grab next byte
  		  UART2RxQueueReadPos = (UART2RxQueueReadPos + 1) % UARTRXQUEUESIZE;
  		  return rx;
  	  }
  	  if ( PortNum == 3 )
  	  {
  		  if (UART3RxQueueReadPos == UART3RxQueueWritePos)
  		    return -1;

  		  // Read from "head"
  		  rx = UART3Buffer[UART3RxQueueReadPos]; // grab next byte
  		  UART3RxQueueReadPos = (UART3RxQueueReadPos + 1) % UARTRXQUEUESIZE;
  		  return rx;
  	  }
  	  return 0;
  }

  size_t HardwareSerial::write(uint8_t send) {
    if ( PortNum == 0 )
     {
   	  /* THRE status, contain valid data */
   	  while ( !(UART0TxEmpty & 0x01) );
   	  LPC_UART0->THR = send;
   	  UART0TxEmpty = 0;	/* not empty in the THR until it shifts out */
     }
     else if (PortNum == 1)
     {

   	  /* THRE status, contain valid data */
   	  while ( !(UART1TxEmpty & 0x01) );
   	  LPC_UART1->THR = send;
   	  UART1TxEmpty = 0;	/* not empty in the THR until it shifts out */


     }
     else if ( PortNum == 2 )
     {
   	  /* THRE status, contain valid data */
   	  while ( !(UART2TxEmpty & 0x01) );
   	  LPC_UART2->THR = send;
   	  UART2TxEmpty = 0;	/* not empty in the THR until it shifts out */

     }
     else if ( PortNum == 3 )
     {
   	  /* THRE status, contain valid data */
   	  while ( !(UART3TxEmpty & 0x01) );
   	  LPC_UART3->THR = send;
   	  UART3TxEmpty = 0;	/* not empty in the THR until it shifts out */

     }
     return 0;
  }

  int HardwareSerial::available() {
    if ( PortNum == 0 )
{
  return (UART0RxQueueWritePos + UARTRXQUEUESIZE - UART0RxQueueReadPos) % UARTRXQUEUESIZE;
}
if ( PortNum == 1 )
{
  return (UART1RxQueueWritePos + UARTRXQUEUESIZE - UART1RxQueueReadPos) % UARTRXQUEUESIZE;
}
if ( PortNum == 2 )
{
  return (UART2RxQueueWritePos + UARTRXQUEUESIZE - UART2RxQueueReadPos) % UARTRXQUEUESIZE;
}
if ( PortNum == 3 )
{
  return (UART3RxQueueWritePos + UARTRXQUEUESIZE - UART3RxQueueReadPos) % UARTRXQUEUESIZE;
}
return 0;
  }

  void HardwareSerial::flush() {
    if ( PortNum == 0 )
{
  UART0RxQueueWritePos = 0;
  UART0RxQueueReadPos = 0;

}
if ( PortNum == 1 )
{
  UART1RxQueueWritePos = 0;
  UART1RxQueueReadPos = 0;
}
if ( PortNum == 2 )
{
  UART2RxQueueWritePos = 0;
  UART2RxQueueReadPos = 0;
}
if ( PortNum == 3 )
{
  UART3RxQueueWritePos = 0;
  UART3RxQueueReadPos = 0;
}
return;
  }

  void HardwareSerial::printf(const char *format, ...) {
    static char buffer[256];
    va_list vArgs;
    va_start(vArgs, format);
    int length = vsnprintf((char *) buffer, 256, (char const *) format, vArgs);
    va_end(vArgs);
    if (length > 0 && length < 256) {
        for (int i = 0; i < length;) {
          write(buffer[i]);
            ++i;
          }
        }
    }

#ifdef __cplusplus
extern "C" {
#endif

/*****************************************************************************
** Function name:		UART0_IRQHandler
**
** Descriptions:		UART0 interrupt handler
**
** parameters:			None
** Returned value:		None
**
*****************************************************************************/
void UART0_IRQHandler (void)
{
  uint8_t IIRValue, LSRValue;

  IIRValue = LPC_UART0->IIR;

  IIRValue >>= 1;			/* skip pending bit in IIR */
  IIRValue &= 0x07;			/* check bit 1~3, interrupt identification */
  if ( IIRValue == IIR_RLS )		/* Receive Line Status */
  {
    LSRValue = LPC_UART0->LSR;
    /* Receive Line Status */
    if ( LSRValue & (LSR_OE|LSR_PE|LSR_FE|LSR_RXFE|LSR_BI) )
    {
      /* There are errors or break interrupt */
      /* Read LSR will clear the interrupt */
      UART0Status = LSRValue;
      dummy = LPC_UART0->RBR;		/* Dummy read on RX to clear
                                   interrupt, then bail out */
      return;
    }
    if ( LSRValue & LSR_RDR )	/* Receive Data Ready */
    {
      /* If no error on RLS, normal ready, save into the data buffer. */
      /* Note: read RBR will clear the interrupt */
      if ((UART0RxQueueWritePos+1) % UARTRXQUEUESIZE != UART0RxQueueReadPos)
      {
        UART0Buffer[UART0RxQueueWritePos] = LPC_UART0->RBR;
        UART0RxQueueWritePos = (UART0RxQueueWritePos+1) % UARTRXQUEUESIZE;
      }
      else
        dummy = LPC_UART0->RBR;
    }
  }
  else if ( IIRValue == IIR_RDA )	/* Receive Data Available */
  {
	  /* Receive Data Available */
	  if ((UART0RxQueueWritePos+1) % UARTRXQUEUESIZE != UART0RxQueueReadPos)
	  {
		  UART0Buffer[UART0RxQueueWritePos] = LPC_UART0->RBR;
		  UART0RxQueueWritePos = (UART0RxQueueWritePos+1) % UARTRXQUEUESIZE;
	  }
	  else
		  dummy = LPC_UART1->RBR;
  }
  else if ( IIRValue == IIR_CTI )	/* Character timeout indicator */
  {
    /* Character Time-out indicator */
    UART0Status |= 0x100;		/* Bit 9 as the CTI error */
  }
  else if ( IIRValue == IIR_THRE )	/* THRE, transmit holding register empty */
  {
    /* THRE interrupt */
    LSRValue = LPC_UART0->LSR;		/* Check status in the LSR to see if
                                     valid data in U0THR or not */
    if ( LSRValue & LSR_THRE )
    {
      UART0TxEmpty = 1;
    }
    else
    {
      UART0TxEmpty = 0;
    }
  }
}

/*****************************************************************************
** Function name:		UART1_IRQHandler
**
** Descriptions:		UART1 interrupt handler
**
** parameters:			None
** Returned value:		None
**
*****************************************************************************/
void UART1_IRQHandler (void)
{
  uint8_t IIRValue, LSRValue;

  IIRValue = LPC_UART1->IIR;

  IIRValue >>= 1;			/* skip pending bit in IIR */
  IIRValue &= 0x07;			/* check bit 1~3, interrupt identification */
  if ( IIRValue == IIR_RLS )		/* Receive Line Status */
  {
    LSRValue = LPC_UART1->LSR;
    /* Receive Line Status */
    if ( LSRValue & (LSR_OE|LSR_PE|LSR_FE|LSR_RXFE|LSR_BI) )
    {
      /* There are errors or break interrupt */
      /* Read LSR will clear the interrupt */
      UART1Status = LSRValue;
      dummy = LPC_UART1->RBR;		/* Dummy read on RX to clear
                                   interrupt, then bail out */
      return;
    }
    if ( LSRValue & LSR_RDR )	/* Receive Data Ready */
    {
      /* If no error on RLS, normal ready, save into the data buffer. */
      /* Note: read RBR will clear the interrupt */
      if ((UART1RxQueueWritePos+1) % UARTRXQUEUESIZE != UART1RxQueueReadPos)
      {
        UART1Buffer[UART1RxQueueWritePos] = LPC_UART1->RBR;
        UART1RxQueueWritePos =(UART1RxQueueWritePos+1) % UARTRXQUEUESIZE;
      }
      else
        dummy = LPC_UART1->RBR;
    }
  }
  else if ( IIRValue == IIR_RDA )	/* Receive Data Available */
  {
	  /* Receive Data Available */
	  if ((UART1RxQueueWritePos+1) % UARTRXQUEUESIZE != UART1RxQueueReadPos)
	  {
		  UART1Buffer[UART1RxQueueWritePos] = LPC_UART1->RBR;
		  UART1RxQueueWritePos = (UART1RxQueueWritePos+1) % UARTRXQUEUESIZE;
	  }
	  else
		  dummy = LPC_UART1->RBR;
  }
  else if ( IIRValue == IIR_CTI )	/* Character timeout indicator */
  {
    /* Character Time-out indicator */
    UART1Status |= 0x100;		/* Bit 9 as the CTI error */
    }
    else if ( IIRValue == IIR_THRE )	/* THRE, transmit holding register empty */
    {
    /* THRE interrupt */
    LSRValue = LPC_UART1->LSR;		/* Check status in the LSR to see if
                                     valid data in U0THR or not */
    if ( LSRValue & LSR_THRE )
    {
      UART1TxEmpty = 1;
    }
    else
    {
      UART1TxEmpty = 0;
    }
  }
}
/*****************************************************************************
** Function name:		UART2_IRQHandler
**
** Descriptions:		UART2 interrupt handler
**
** parameters:			None
** Returned value:		None
**
*****************************************************************************/
void UART2_IRQHandler (void)
{
  uint8_t IIRValue, LSRValue;

  IIRValue = LPC_UART2->IIR;

  IIRValue >>= 1;			/* skip pending bit in IIR */
  IIRValue &= 0x07;			/* check bit 1~3, interrupt identification */
  if ( IIRValue == IIR_RLS )		/* Receive Line Status */
  {
    LSRValue = LPC_UART2->LSR;
    /* Receive Line Status */
    if ( LSRValue & (LSR_OE|LSR_PE|LSR_FE|LSR_RXFE|LSR_BI) )
    {
      /* There are errors or break interrupt */
      /* Read LSR will clear the interrupt */
      UART2Status = LSRValue;
      dummy = LPC_UART2->RBR;		/* Dummy read on RX to clear
                                   interrupt, then bail out */
      return;
    }
    if ( LSRValue & LSR_RDR )	/* Receive Data Ready */
    {
      /* If no error on RLS, normal ready, save into the data buffer. */
      /* Note: read RBR will clear the interrupt */
      if ((UART2RxQueueWritePos+1) % UARTRXQUEUESIZE != UART2RxQueueReadPos)
      {
        UART2Buffer[UART2RxQueueWritePos] = LPC_UART2->RBR;
        UART2RxQueueWritePos = (UART2RxQueueWritePos+1) % UARTRXQUEUESIZE;
      }
    }
  }
  else if ( IIRValue == IIR_RDA )	/* Receive Data Available */
  {
	  /* Receive Data Available */
	  if ((UART2RxQueueWritePos+1) % UARTRXQUEUESIZE != UART2RxQueueReadPos)
	  {
		  UART2Buffer[UART2RxQueueWritePos] = LPC_UART2->RBR;
		  UART2RxQueueWritePos = (UART2RxQueueWritePos+1) % UARTRXQUEUESIZE;
	  }
	  else
		  dummy = LPC_UART2->RBR;
  }
  else if ( IIRValue == IIR_CTI )	/* Character timeout indicator */
  {
    /* Character Time-out indicator */
    UART2Status |= 0x100;		/* Bit 9 as the CTI error */
  }
  else if ( IIRValue == IIR_THRE )	/* THRE, transmit holding register empty */
  {
    /* THRE interrupt */
    LSRValue = LPC_UART2->LSR;		/* Check status in the LSR to see if
                                     valid data in U0THR or not */
    if ( LSRValue & LSR_THRE )
    {
      UART2TxEmpty = 1;
    }
    else
    {
      UART2TxEmpty = 0;
    }
  }
}
/*****************************************************************************
** Function name:		UART3_IRQHandler
**
** Descriptions:		UART0 interrupt handler
**
** parameters:			None
** Returned value:		None
**
*****************************************************************************/
void UART3_IRQHandler (void)
{
  uint8_t IIRValue, LSRValue;

  IIRValue = LPC_UART3->IIR;

  IIRValue >>= 1;			/* skip pending bit in IIR */
  IIRValue &= 0x07;			/* check bit 1~3, interrupt identification */
  if ( IIRValue == IIR_RLS )		/* Receive Line Status */
  {
    LSRValue = LPC_UART3->LSR;
    /* Receive Line Status */
    if ( LSRValue & (LSR_OE|LSR_PE|LSR_FE|LSR_RXFE|LSR_BI) )
    {
      /* There are errors or break interrupt */
      /* Read LSR will clear the interrupt */
      UART3Status = LSRValue;
      dummy = LPC_UART3->RBR;		/* Dummy read on RX to clear
                                  interrupt, then bail out */
      return;
    }
    if ( LSRValue & LSR_RDR )	/* Receive Data Ready */
    {
      /* If no error on RLS, normal ready, save into the data buffer. */
      /* Note: read RBR will clear the interrupt */
      if ((UART3RxQueueWritePos+1) % UARTRXQUEUESIZE != UART3RxQueueReadPos)
        {
          UART3Buffer[UART3RxQueueWritePos] = LPC_UART3->RBR;
          UART3RxQueueWritePos = (UART3RxQueueWritePos+1) % UARTRXQUEUESIZE;
        }
    }
  }
  else if ( IIRValue == IIR_RDA )	/* Receive Data Available */
  {
	  /* Receive Data Available */
	  if ((UART3RxQueueWritePos+1) % UARTRXQUEUESIZE != UART3RxQueueReadPos)
	  {
		  UART3Buffer[UART3RxQueueWritePos] = LPC_UART3->RBR;
		  UART3RxQueueWritePos = (UART3RxQueueWritePos+1) % UARTRXQUEUESIZE;
	  }
	  else
		  dummy = LPC_UART3->RBR;
  }
  else if ( IIRValue == IIR_CTI )	/* Character timeout indicator */
  {
    /* Character Time-out indicator */
    UART3Status |= 0x100;		/* Bit 9 as the CTI error */
  }
  else if ( IIRValue == IIR_THRE )	/* THRE, transmit holding register empty */
  {
    /* THRE interrupt */
    LSRValue = LPC_UART3->LSR;		/* Check status in the LSR to see if
                                     valid data in U0THR or not */
    if ( LSRValue & LSR_THRE )
    {
      UART3TxEmpty = 1;
    }
    else
    {
      UART3TxEmpty = 0;
    }
  }
}

#ifdef __cplusplus
}
#endif

#endif // TARGET_LPC1768