mirror of
https://github.com/brmlab/edubrm.git
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243 lines
8.6 KiB
C
243 lines
8.6 KiB
C
/*----------------------------------------------------------------------------
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* Name: serial.c
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* Purpose: serial port handling for LPC134x
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* Version: V1.10
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*----------------------------------------------------------------------------
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* This software is supplied "AS IS" without any warranties, express,
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* implied or statutory, including but not limited to the implied
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* warranties of fitness for purpose, satisfactory quality and
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* noninfringement. Keil extends you a royalty-free right to reproduce
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* and distribute executable files created using this software for use
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* on NXP Semiconductors LPC microcontroller devices only. Nothing else
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* gives you the right to use this software.
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*
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* Copyright (c) 2009 Keil - An ARM Company. All rights reserved.
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*---------------------------------------------------------------------------*/
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#include "LPC13xx.h" // LPC13xx definitions
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#include "type.h"
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#include "serial.h"
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/*----------------------------------------------------------------------------
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Defines for ring buffers
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*---------------------------------------------------------------------------*/
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#define SER_BUF_SIZE (128) // serial buffer in bytes (power 2)
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#define SER_BUF_MASK (SER_BUF_SIZE-1ul) // buffer size mask
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/* Buffer read / write macros */
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#define SER_BUF_RESET(serBuf) (serBuf.rdIdx = serBuf.wrIdx = 0)
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#define SER_BUF_WR(serBuf, dataIn) (serBuf.data[SER_BUF_MASK & serBuf.wrIdx++] = (dataIn))
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#define SER_BUF_RD(serBuf) (serBuf.data[SER_BUF_MASK & serBuf.rdIdx++])
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#define SER_BUF_EMPTY(serBuf) (serBuf.rdIdx == serBuf.wrIdx)
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#define SER_BUF_FULL(serBuf) (serBuf.rdIdx == serBuf.wrIdx+1)
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#define SER_BUF_COUNT(serBuf) (SER_BUF_MASK & (serBuf.wrIdx - serBuf.rdIdx))
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// buffer type
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typedef struct __SER_BUF_T {
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unsigned char data[SER_BUF_SIZE];
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unsigned int wrIdx;
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unsigned int rdIdx;
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} SER_BUF_T;
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unsigned long ser_txRestart; // NZ if TX restart is required
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unsigned short ser_lineState; // ((msr << 8) | (lsr))
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SER_BUF_T ser_out; // Serial data buffers
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SER_BUF_T ser_in;
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/*----------------------------------------------------------------------------
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open the serial port
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*---------------------------------------------------------------------------*/
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void ser_OpenPort (void) {
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NVIC_DisableIRQ(UART_IRQn);
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LPC_IOCON->PIO1_6 &= ~0x07; /* UART I/O config */
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LPC_IOCON->PIO1_6 |= 0x01; /* UART RXD */
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LPC_IOCON->PIO1_7 &= ~0x07;
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LPC_IOCON->PIO1_7 |= 0x01; /* UART TXD */
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/* Enable UART clock */
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LPC_SYSCON->SYSAHBCLKCTRL |= (1<<12);
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LPC_SYSCON->UARTCLKDIV = 0x1; /* divided by 1 */
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return;
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}
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/*----------------------------------------------------------------------------
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close the serial port
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*---------------------------------------------------------------------------*/
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void ser_ClosePort (void) {
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LPC_IOCON->PIO1_6 &= ~0x07; /* UART I/O config */
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LPC_IOCON->PIO1_7 &= ~0x07;
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/* Disable the interrupt in the VIC and UART controllers */
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LPC_UART->IER = 0;
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NVIC_DisableIRQ(UART_IRQn);
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return;
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}
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/*----------------------------------------------------------------------------
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initialize the serial port
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*---------------------------------------------------------------------------*/
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void ser_InitPort (unsigned long baudrate, unsigned int databits,
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unsigned int parity, unsigned int stopbits) {
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uint8_t lcr_p, lcr_s, lcr_d;
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uint32_t dll;
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uint32_t Fdiv;
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switch (databits) {
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case 5: // 5 Data bits
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lcr_d = 0x00;
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break;
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case 6: // 6 Data bits
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lcr_d = 0x01;
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break;
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case 7: // 7 Data bits
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lcr_d = 0x02;
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break;
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case 8: // 8 Data bits
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default:
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lcr_d = 0x03;
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break;
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}
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switch (stopbits) {
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case 1: // 1,5 Stop bits
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case 2: // 2 Stop bits
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lcr_s = 0x04;
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break;
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case 0: // 1 Stop bit
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default:
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lcr_s = 0x00;
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break;
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}
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switch (parity) {
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case 1: // Parity Odd
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lcr_p = 0x08;
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break;
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case 2: // Parity Even
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lcr_p = 0x18;
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break;
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case 3: // Parity Mark
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lcr_p = 0x28;
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break;
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case 4: // Parity Space
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lcr_p = 0x38;
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break;
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case 0: // Parity None
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default:
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lcr_p = 0x00;
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break;
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}
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SER_BUF_RESET(ser_out); // reset out buffer
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SER_BUF_RESET(ser_in); // reset in buffer
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/* Note that the pclk is 24,0 MHz. (48.0 MHz / 2) */
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/* 24 MHz PCLK generates also rates for 115200, 57600 baud */
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Fdiv = LPC_SYSCON->UARTCLKDIV;
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dll = (((SystemCoreClock/LPC_SYSCON->SYSAHBCLKDIV)/Fdiv)/16)/baudrate ; /*baud rate */
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LPC_UART->FDR = 0; // Fractional divider not used
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LPC_UART->LCR = 0x80 | lcr_d | lcr_p | lcr_s; // Data bits, Parity, Stop bit
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LPC_UART->DLL = dll; // Baud Rate depending on PCLK
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LPC_UART->DLM = (dll >> 8); // High divisor latch
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LPC_UART->LCR = 0x00 | lcr_d | lcr_p | lcr_s; // DLAB = 0
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LPC_UART->IER = 0x03; // Enable TX/RX interrupts
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LPC_UART->FCR = 0x07; /* Enable and reset TX and RX FIFO. */
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ser_txRestart = 1; // TX fifo is empty
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/* Enable the UART Interrupt */
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NVIC_EnableIRQ(UART_IRQn);
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return;
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}
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/*----------------------------------------------------------------------------
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read data from serial port
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*---------------------------------------------------------------------------*/
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int ser_Read (char *buffer, const int *length) {
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int bytesToRead, bytesRead;
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/* Read *length bytes, block if *bytes are not avaialable */
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bytesToRead = *length;
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bytesToRead = (bytesToRead < (*length)) ? bytesToRead : (*length);
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bytesRead = bytesToRead;
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while (bytesToRead--) {
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while (SER_BUF_EMPTY(ser_in)); // Block until data is available if none
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*buffer++ = SER_BUF_RD(ser_in);
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}
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return (bytesRead);
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}
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/*----------------------------------------------------------------------------
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write data to the serial port
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*---------------------------------------------------------------------------*/
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int ser_Write (const char *buffer, int *length) {
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int bytesToWrite, bytesWritten;
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// Write *length bytes
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bytesToWrite = *length;
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bytesWritten = bytesToWrite;
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while (!SER_BUF_EMPTY(ser_out)); // Block until space is available if none
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while (bytesToWrite) {
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SER_BUF_WR(ser_out, *buffer++); // Read Rx FIFO to buffer
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bytesToWrite--;
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}
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if (ser_txRestart) {
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ser_txRestart = 0;
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LPC_UART->THR = SER_BUF_RD(ser_out); // Write to the Tx Register
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}
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return (bytesWritten);
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}
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/*----------------------------------------------------------------------------
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check if character(s) are available at the serial interface
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*---------------------------------------------------------------------------*/
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void ser_AvailChar (int *availChar) {
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*availChar = SER_BUF_COUNT(ser_in);
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}
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/*----------------------------------------------------------------------------
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read the line state of the serial port
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*---------------------------------------------------------------------------*/
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void ser_LineState (unsigned short *lineState) {
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*lineState = ser_lineState;
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ser_lineState = 0;
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}
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/*----------------------------------------------------------------------------
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serial port 1 interrupt
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*---------------------------------------------------------------------------*/
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void UART_IRQHandler(void)
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{
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volatile unsigned long iir;
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iir = LPC_UART->IIR;
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if ((iir & 0x4) || (iir & 0xC)) { // RDA or CTI pending
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while (LPC_UART->LSR & 0x01) { // Rx FIFO is not empty
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SER_BUF_WR(ser_in, LPC_UART->RBR); // Read Rx FIFO to buffer
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}
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}
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if ((iir & 0x2)) { // TXMIS pending
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if (SER_BUF_COUNT(ser_out) != 0) {
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LPC_UART->THR = SER_BUF_RD(ser_out); // Write to the Tx FIFO
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ser_txRestart = 0;
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}
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else {
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ser_txRestart = 1;
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}
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}
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ser_lineState = LPC_UART->LSR & 0x1E; // update linestate
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return;
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}
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