239 lines
7.2 KiB
C
239 lines
7.2 KiB
C
/*****************************************************************************
|
|
* uart.c: UART API file for NXP LPC11xx Family Microprocessors
|
|
*
|
|
* Copyright(C) 2008, NXP Semiconductor
|
|
* All rights reserved.
|
|
*
|
|
* History
|
|
* 2009.12.07 ver 1.00 Preliminary version, first Release
|
|
*
|
|
******************************************************************************/
|
|
|
|
#include <stdint.h>
|
|
#include "LPC11Uxx.h"
|
|
#include "lpc11uxx_uart.h"
|
|
|
|
volatile uint32_t UARTStatus;
|
|
volatile uint8_t UARTTxEmpty = 1;
|
|
volatile uint8_t UARTBuffer[BUFSIZE];
|
|
volatile uint32_t UARTCount = 0;
|
|
|
|
/*****************************************************************************
|
|
** Function name: UART_IRQHandler
|
|
**
|
|
** Descriptions: UART interrupt handler
|
|
**
|
|
** parameters: None
|
|
** Returned value: None
|
|
**
|
|
*****************************************************************************/
|
|
void UART_IRQHandler(void)
|
|
{
|
|
uint8_t IIRValue, LSRValue;
|
|
uint8_t Dummy = Dummy;
|
|
|
|
IIRValue = LPC_USART->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_USART->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 */
|
|
UARTStatus = LSRValue;
|
|
Dummy = LPC_USART->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 */
|
|
UARTBuffer[UARTCount++] = LPC_USART->RBR;
|
|
if (UARTCount == BUFSIZE)
|
|
{
|
|
UARTCount = 0; /* buffer overflow */
|
|
}
|
|
}
|
|
}
|
|
else if (IIRValue == IIR_RDA) /* Receive Data Available */
|
|
{
|
|
/* Receive Data Available */
|
|
UARTBuffer[UARTCount++] = LPC_USART->RBR;
|
|
if (UARTCount == BUFSIZE)
|
|
{
|
|
UARTCount = 0; /* buffer overflow */
|
|
}
|
|
}
|
|
else if (IIRValue == IIR_CTI) /* Character timeout indicator */
|
|
{
|
|
/* Character Time-out indicator */
|
|
UARTStatus |= 0x100; /* Bit 9 as the CTI error */
|
|
}
|
|
else if (IIRValue == IIR_THRE) /* THRE, transmit holding register empty */
|
|
{
|
|
/* THRE interrupt */
|
|
LSRValue = LPC_USART->LSR; /* Check status in the LSR to see if
|
|
valid data in U0THR or not */
|
|
if (LSRValue & LSR_THRE)
|
|
{
|
|
UARTTxEmpty = 1;
|
|
}
|
|
else
|
|
{
|
|
UARTTxEmpty = 0;
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
#if MODEM_TEST
|
|
/*****************************************************************************
|
|
** Function name: ModemInit
|
|
**
|
|
** Descriptions: Initialize UART0 port as modem, setup pin select.
|
|
**
|
|
** parameters: None
|
|
** Returned value: None
|
|
**
|
|
*****************************************************************************/
|
|
void ModemInit( void )
|
|
{
|
|
LPC_IOCON->PIO2_0 &= ~0x07; /* UART I/O config */
|
|
LPC_IOCON->PIO2_0 |= 0x01; /* UART DTR */
|
|
LPC_IOCON->PIO0_7 &= ~0x07; /* UART I/O config */
|
|
LPC_IOCON->PIO0_7 |= 0x01; /* UART CTS */
|
|
LPC_IOCON->PIO1_5 &= ~0x07; /* UART I/O config */
|
|
LPC_IOCON->PIO1_5 |= 0x01; /* UART RTS */
|
|
#if 1
|
|
LPC_IOCON->DSR_LOC = 0;
|
|
LPC_IOCON->PIO2_1 &= ~0x07; /* UART I/O config */
|
|
LPC_IOCON->PIO2_1 |= 0x01; /* UART DSR */
|
|
|
|
LPC_IOCON->DCD_LOC = 0;
|
|
LPC_IOCON->PIO2_2 &= ~0x07; /* UART I/O config */
|
|
LPC_IOCON->PIO2_2 |= 0x01; /* UART DCD */
|
|
|
|
LPC_IOCON->RI_LOC = 0;
|
|
LPC_IOCON->PIO2_3 &= ~0x07; /* UART I/O config */
|
|
LPC_IOCON->PIO2_3 |= 0x01; /* UART RI */
|
|
|
|
#else
|
|
LPC_IOCON->DSR_LOC = 1;
|
|
LPC_IOCON->PIO3_1 &= ~0x07; /* UART I/O config */
|
|
LPC_IOCON->PIO3_1 |= 0x01; /* UART DSR */
|
|
|
|
LPC_IOCON->DCD_LOC = 1;
|
|
LPC_IOCON->PIO3_2 &= ~0x07; /* UART I/O config */
|
|
LPC_IOCON->PIO3_2 |= 0x01; /* UART DCD */
|
|
|
|
LPC_IOCON->RI_LOC = 1;
|
|
LPC_IOCON->PIO3_3 &= ~0x07; /* UART I/O config */
|
|
LPC_IOCON->PIO3_3 |= 0x01; /* UART RI */
|
|
#endif
|
|
LPC_USART->MCR = 0xC0; /* Enable Auto RTS and Auto CTS. */
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
/*****************************************************************************
|
|
** Function name: UARTInit
|
|
**
|
|
** Descriptions: Initialize UART0 port, setup pin select,
|
|
** clock, parity, stop bits, FIFO, etc.
|
|
**
|
|
** parameters: UART baudrate
|
|
** Returned value: None
|
|
**
|
|
*****************************************************************************/
|
|
void UARTInit(uint32_t baudrate)
|
|
{
|
|
uint32_t Fdiv;
|
|
uint32_t regVal;
|
|
|
|
UARTTxEmpty = 1;
|
|
UARTCount = 0;
|
|
|
|
NVIC_DisableIRQ(UART_IRQn);
|
|
|
|
LPC_IOCON->PIO0_18 &= ~0x07; /* UART I/O config */
|
|
LPC_IOCON->PIO0_18 |= 0x01; /* UART RXD */
|
|
LPC_IOCON->PIO0_19 &= ~0x07;
|
|
LPC_IOCON->PIO0_19 |= 0x01; /* UART TXD */
|
|
/* Enable UART clock */
|
|
LPC_SYSCON->SYSAHBCLKCTRL |= (1<<12);
|
|
LPC_SYSCON->UARTCLKDIV = 0x1; /* divided by 1 */
|
|
|
|
LPC_USART->LCR = 0x83; /* 8 bits, no Parity, 1 Stop bit */
|
|
regVal = LPC_SYSCON->UARTCLKDIV;
|
|
|
|
Fdiv = (((SystemCoreClock*LPC_SYSCON->SYSAHBCLKDIV)/regVal)/16)/baudrate ; /*baud rate */
|
|
|
|
LPC_USART->DLM = Fdiv / 256;
|
|
LPC_USART->DLL = Fdiv % 256;
|
|
LPC_USART->LCR = 0x03; /* DLAB = 0 */
|
|
LPC_USART->FCR = 0x07; /* Enable and reset TX and RX FIFO. */
|
|
|
|
/* Read to clear the line status. */
|
|
regVal = LPC_USART->LSR;
|
|
|
|
/* Ensure a clean start, no data in either TX or RX FIFO. */
|
|
// CodeRed - added parentheses around comparison in operand of &
|
|
while (( LPC_USART->LSR & (LSR_THRE|LSR_TEMT)) != (LSR_THRE|LSR_TEMT) );
|
|
while ( LPC_USART->LSR & LSR_RDR )
|
|
{
|
|
regVal = LPC_USART->RBR; /* Dump data from RX FIFO */
|
|
}
|
|
|
|
/* Enable the UART Interrupt */
|
|
NVIC_EnableIRQ(UART_IRQn);
|
|
|
|
#if CONFIG_UART_ENABLE_INTERRUPT==1
|
|
#if CONFIG_UART_ENABLE_TX_INTERRUPT==1
|
|
LPC_USART->IER = IER_RBR | IER_THRE | IER_RLS; /* Enable UART interrupt */
|
|
#else
|
|
LPC_USART->IER = IER_RBR | IER_RLS; /* Enable UART interrupt */
|
|
#endif
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
** Function name: UARTSend
|
|
**
|
|
** Descriptions: Send a block of data to the UART 0 port based
|
|
** on the data length
|
|
**
|
|
** parameters: buffer pointer, and data length
|
|
** Returned value: None
|
|
**
|
|
*****************************************************************************/
|
|
void UARTSend(uint8_t *BufferPtr, uint32_t Length)
|
|
{
|
|
|
|
while ( Length != 0 )
|
|
{
|
|
/* THRE status, contain valid data */
|
|
#if CONFIG_UART_ENABLE_TX_INTERRUPT==1
|
|
/* Below flag is set inside the interrupt handler when THRE occurs. */
|
|
while ( !(UARTTxEmpty & 0x01) );
|
|
LPC_USART->THR = *BufferPtr;
|
|
UARTTxEmpty = 0; /* not empty in the THR until it shifts out */
|
|
#else
|
|
while ( !(LPC_USART->LSR & LSR_THRE) );
|
|
LPC_USART->THR = *BufferPtr;
|
|
#endif
|
|
BufferPtr++;
|
|
Length--;
|
|
}
|
|
return;
|
|
}
|
|
|
|
/******************************************************************************
|
|
** End Of File
|
|
******************************************************************************/
|