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/*
* @brief LPC8xx UART driver
*
* @note
* Copyright(C) NXP Semiconductors, 2012
* All rights reserved.
*
* @par
* Software that is described herein is for illustrative purposes only
* which provides customers with programming information regarding the
* LPC products. This software is supplied "AS IS" without any warranties of
* any kind, and NXP Semiconductors and its licenser disclaim any and
* all warranties, express or implied, including all implied warranties of
* merchantability, fitness for a particular purpose and non-infringement of
* intellectual property rights. NXP Semiconductors assumes no responsibility
* or liability for the use of the software, conveys no license or rights under any
* patent, copyright, mask work right, or any other intellectual property rights in
* or to any products. NXP Semiconductors reserves the right to make changes
* in the software without notification. NXP Semiconductors also makes no
* representation or warranty that such application will be suitable for the
* specified use without further testing or modification.
*
* @par
* Permission to use, copy, modify, and distribute this software and its
* documentation is hereby granted, under NXP Semiconductors' and its
* licensor's relevant copyrights in the software, without fee, provided that it
* is used in conjunction with NXP Semiconductors microcontrollers. This
* copyright, permission, and disclaimer notice must appear in all copies of
* this code.
*/
#include "chip.h"
#include "uart_8xx.h"
/*****************************************************************************
* Private types/enumerations/variables
****************************************************************************/
/*****************************************************************************
* Public types/enumerations/variables
****************************************************************************/
/*****************************************************************************
* Private functions
****************************************************************************/
/* Return UART clock ID from the UART register address */
static CHIP_SYSCTL_CLOCK_T getUARTClockID(LPC_USART_T *pUART)
{
if (pUART == LPC_USART0) {
return SYSCTL_CLOCK_UART0;
}
else if (pUART == LPC_USART1) {
return SYSCTL_CLOCK_UART1;
}
return SYSCTL_CLOCK_UART2;
}
/*****************************************************************************
* Public functions
****************************************************************************/
/* Initialize the UART peripheral */
void Chip_UART_Init(LPC_USART_T *pUART)
{
/* Enable USART clock */
Chip_Clock_EnablePeriphClock(getUARTClockID(pUART));
/* UART reset */
if (pUART == LPC_USART0) {
/* Peripheral reset control to USART0 */
Chip_SYSCTL_PeriphReset(RESET_USART0);
}
else if (pUART == LPC_USART1) {
/* Peripheral reset control to USART1 */
Chip_SYSCTL_PeriphReset(RESET_USART1);
}
else {
/* Peripheral reset control to USART2 */
Chip_SYSCTL_PeriphReset(RESET_USART2);
}
}
/* Initialize the UART peripheral */
void Chip_UART_DeInit(LPC_USART_T *pUART)
{
/* Disable USART clock */
Chip_Clock_DisablePeriphClock(getUARTClockID(pUART));
}
/* Transmit a byte array through the UART peripheral (non-blocking) */
int Chip_UART_Send(LPC_USART_T *pUART, const void *data, int numBytes)
{
int sent = 0;
uint8_t *p8 = (uint8_t *) data;
/* Send until the transmit FIFO is full or out of bytes */
while ((sent < numBytes) &&
((Chip_UART_GetStatus(pUART) & UART_STAT_TXRDY) != 0)) {
Chip_UART_SendByte(pUART, *p8);
p8++;
sent++;
}
return sent;
}
/* Transmit a byte array through the UART peripheral (blocking) */
int Chip_UART_SendBlocking(LPC_USART_T *pUART, const void *data, int numBytes)
{
int pass, sent = 0;
uint8_t *p8 = (uint8_t *) data;
while (numBytes > 0) {
pass = Chip_UART_Send(pUART, p8, numBytes);
numBytes -= pass;
sent += pass;
p8 += pass;
}
return sent;
}
/* Read data through the UART peripheral (non-blocking) */
int Chip_UART_Read(LPC_USART_T *pUART, void *data, int numBytes)
{
int readBytes = 0;
uint8_t *p8 = (uint8_t *) data;
/* Send until the transmit FIFO is full or out of bytes */
while ((readBytes < numBytes) &&
((Chip_UART_GetStatus(pUART) & UART_STAT_RXRDY) != 0)) {
*p8 = Chip_UART_ReadByte(pUART);
p8++;
readBytes++;
}
return readBytes;
}
/* Read data through the UART peripheral (blocking) */
int Chip_UART_ReadBlocking(LPC_USART_T *pUART, void *data, int numBytes)
{
int pass, readBytes = 0;
uint8_t *p8 = (uint8_t *) data;
while (numBytes > 0) {
pass = Chip_UART_Read(pUART, p8, numBytes);
numBytes -= pass;
readBytes += pass;
p8 += pass;
}
return readBytes;
}
/* Set baud rate for UART */
void Chip_UART_SetBaud(LPC_USART_T *pUART, uint32_t baudrate)
{
uint32_t baudRateGenerator;
baudRateGenerator = Chip_Clock_GetUSARTNBaseClockRate() / (16 * baudrate);
pUART->BRG = baudRateGenerator - 1; /* baud rate */
}
/* UART receive-only interrupt handler for ring buffers */
void Chip_UART_RXIntHandlerRB(LPC_USART_T *pUART, RINGBUFF_T *pRB)
{
/* New data will be ignored if data not popped in time */
while ((Chip_UART_GetStatus(pUART) & UART_STAT_RXRDY) != 0) {
uint8_t ch = Chip_UART_ReadByte(pUART);
RingBuf_Write(pRB, &ch, 1);
}
}
/* UART transmit-only interrupt handler for ring buffers */
void Chip_UART_TXIntHandlerRB(LPC_USART_T *pUART, RINGBUFF_T *pRB)
{
uint8_t ch;
/* Fill FIFO until full or until TX ring buffer is empty */
while (((Chip_UART_GetStatus(pUART) & UART_STAT_TXRDY) != 0) &&
RingBuf_Read(pRB, &ch, 1)) {
Chip_UART_SendByte(pUART, ch);
}
}
/* Populate a transmit ring buffer and start UART transmit */
uint32_t Chip_UART_SendRB(LPC_USART_T *pUART, RINGBUFF_T *pRB, const void *data, int count)
{
uint32_t ret;
uint8_t *p8 = (uint8_t *) data;
/* Don't let UART transmit ring buffer change in the UART IRQ handler */
Chip_UART_IntDisable(pUART, UART_INTEN_TXRDY);
/* Move as much data as possible into transmit ring buffer */
ret = RingBuf_Write(pRB, p8, count);
Chip_UART_TXIntHandlerRB(pUART, pRB);
/* Add additional data to transmit ring buffer if possible */
ret += RingBuf_Write(pRB, (p8 + ret), (count - ret));
/* Enable UART transmit interrupt */
Chip_UART_IntEnable(pUART, UART_INTEN_TXRDY);
return ret;
}
/* Copy data from a receive ring buffer */
int Chip_UART_ReadRB(LPC_USART_T *pUART, RINGBUFF_T *pRB, void *data, int bytes)
{
(void) pUART;
return RingBuf_Read(pRB, (uint8_t *) data, bytes);
}
/* UART receive/transmit interrupt handler for ring buffers */
void Chip_UART_IRQRBHandler(LPC_USART_T *pUART, RINGBUFF_T *pRXRB, RINGBUFF_T *pTXRB)
{
/* Handle transmit interrupt if enabled */
if ((Chip_UART_GetStatus(pUART) & UART_STAT_TXRDY) != 0) {
Chip_UART_TXIntHandlerRB(pUART, pTXRB);
/* Disable transmit interrupt if the ring buffer is empty */
if (RingBuf_GetFreeBytes(pTXRB) == 0) {
Chip_UART_IntDisable(pUART, UART_INTEN_TXRDY);
}
}
/* Handle receive interrupt */
Chip_UART_RXIntHandlerRB(pUART, pRXRB);
}
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