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ChibiOS/os/hal/platforms/LPC214x/serial_lld.c

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/*
ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT 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.
ChibiOS/RT 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/>.
*/
/**
* @file LPC214x/serial_lld.c
* @brief LPC214x low level serial driver code.
* @addtogroup LPC214x_SERIAL
* @{
*/
#include "ch.h"
#include "hal.h"
#if CH_HAL_USE_SERIAL || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
#if USE_LPC214x_UART0 || defined(__DOXYGEN__)
/** @brief UART0 serial driver identifier.*/
SerialDriver SD1;
#endif
#if USE_LPC214x_UART1 || defined(__DOXYGEN__)
/** @brief UART1 serial driver identifier.*/
SerialDriver SD2;
#endif
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/** @brief Driver default configuration.*/
static const SerialDriverConfig default_config = {
38400,
LCR_WL8 | LCR_STOP1 | LCR_NOPARITY,
FCR_TRIGGER0
};
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief UART initialization.
* @param[in] u pointer to an UART I/O block
* @param[in] config the architecture-dependent serial driver configuration
*/
static void uart_init(UART *u, const SerialDriverConfig *config) {
uint32_t div = PCLK / (config->speed << 4);
u->UART_LCR = config->lcr | LCR_DLAB;
u->UART_DLL = div;
u->UART_DLM = div >> 8;
u->UART_LCR = config->lcr;
u->UART_FCR = FCR_ENABLE | FCR_RXRESET | FCR_TXRESET | config->fcr;
u->UART_ACR = 0;
u->UART_FDR = 0x10;
u->UART_TER = TER_ENABLE;
u->UART_IER = IER_RBR | IER_STATUS;
}
/**
* @brief UART de-initialization.
* @param[in] u pointer to an UART I/O block
*/
static void uart_deinit(UART *u) {
u->UART_DLL = 1;
u->UART_DLM = 0;
u->UART_FDR = 0x10;
u->UART_IER = 0;
u->UART_FCR = FCR_RXRESET | FCR_TXRESET;
u->UART_LCR = 0;
u->UART_ACR = 0;
u->UART_TER = TER_ENABLE;
}
/**
* @brief Error handling routine.
* @param[in] err UART LSR register value
* @param[in] sdp communication channel associated to the UART
*/
static void set_error(IOREG32 err, SerialDriver *sdp) {
sdflags_t sts = 0;
if (err & LSR_OVERRUN)
sts |= SD_OVERRUN_ERROR;
if (err & LSR_PARITY)
sts |= SD_PARITY_ERROR;
if (err & LSR_FRAMING)
sts |= SD_FRAMING_ERROR;
if (err & LSR_BREAK)
sts |= SD_BREAK_DETECTED;
chSysLockFromIsr();
sdAddFlagsI(sdp, sts);
chSysUnlockFromIsr();
}
#if defined(__GNU__)
__attribute__((noinline))
#endif
/**
* @brief Common IRQ handler.
* @param[in] u pointer to an UART I/O block
* @param[in] sdp communication channel associated to the UART
* @note Tries hard to clear all the pending interrupt sources, we dont want to
* go through the whole ISR and have another interrupt soon after.
*/
static void serve_interrupt(UART *u, SerialDriver *sdp) {
while (TRUE) {
switch (u->UART_IIR & IIR_SRC_MASK) {
case IIR_SRC_NONE:
return;
case IIR_SRC_ERROR:
set_error(u->UART_LSR, sdp);
break;
case IIR_SRC_TIMEOUT:
case IIR_SRC_RX:
while (u->UART_LSR & LSR_RBR_FULL) {
chSysLockFromIsr();
if (chIQPutI(&sdp->d2.iqueue, u->UART_RBR) < Q_OK)
sdAddFlagsI(sdp, SD_OVERRUN_ERROR);
chSysUnlockFromIsr();
}
chSysLockFromIsr();
chEvtBroadcastI(&sdp->d1.ievent);
chSysUnlockFromIsr();
break;
case IIR_SRC_TX:
{
#if UART_FIFO_PRELOAD > 0
int i = UART_FIFO_PRELOAD;
do {
chSysLockFromIsr();
msg_t b = chOQGetI(&sdp->d2.oqueue);
chSysUnlockFromIsr();
if (b < Q_OK) {
u->UART_IER &= ~IER_THRE;
chSysLockFromIsr();
chEvtBroadcastI(&sdp->d1.oevent);
chSysUnlockFromIsr();
break;
}
u->UART_THR = b;
} while (--i);
#else
chSysLockFromIsr();
msg_t b = sdRequestDataI(sdp);
chSysUnlockFromIsr();
if (b < Q_OK)
u->UART_IER &= ~IER_THRE;
else
u->UART_THR = b;
#endif
}
default:
(void) u->UART_THR;
(void) u->UART_RBR;
}
}
}
#if UART_FIFO_PRELOAD > 0
static void preload(UART *u, SerialDriver *sdp) {
if (u->UART_LSR & LSR_THRE) {
int i = UART_FIFO_PRELOAD;
do {
chSysLockFromIsr();
msg_t b = chOQGetI(&sdp->d2.oqueue);
chSysUnlockFromIsr();
if (b < Q_OK) {
chSysLockFromIsr();
chEvtBroadcastI(&sdp->d1.oevent);
chSysUnlockFromIsr();
return;
}
u->UART_THR = b;
} while (--i);
}
u->UART_IER |= IER_THRE;
}
#endif
#if USE_LPC214x_UART0 || defined(__DOXYGEN__)
static void notify1(void) {
#if UART_FIFO_PRELOAD > 0
preload(U0Base, &SD1);
#else
UART *u = U0Base;
if (u->UART_LSR & LSR_THRE) {
chSysLockFromIsr();
u->UART_THR = chOQGetI(&SD1.sd_oqueue);
chSysUnlockFromIsr();
}
u->UART_IER |= IER_THRE;
#endif
}
#endif
#if USE_LPC214x_UART1 || defined(__DOXYGEN__)
static void notify2(void) {
#if UART_FIFO_PRELOAD > 0
preload(U1Base, &SD2);
#else
UART *u = U1Base;
if (u->UART_LSR & LSR_THRE)
u->UART_THR = chOQGetI(&SD2.sd_oqueue);
u->UART_IER |= IER_THRE;
#endif
}
#endif
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
#if USE_LPC214x_UART0 || defined(__DOXYGEN__)
CH_IRQ_HANDLER(UART0IrqHandler) {
CH_IRQ_PROLOGUE();
serve_interrupt(U0Base, &SD1);
VICVectAddr = 0;
CH_IRQ_EPILOGUE();
}
#endif
#if USE_LPC214x_UART1 || defined(__DOXYGEN__)
CH_IRQ_HANDLER(UART1IrqHandler) {
CH_IRQ_PROLOGUE();
serve_interrupt(U1Base, &SD2);
VICVectAddr = 0;
CH_IRQ_EPILOGUE();
}
#endif
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* Low level serial driver initialization.
*/
void sd_lld_init(void) {
#if USE_LPC214x_UART0
sdObjectInit(&SD1, NULL, notify1);
SetVICVector(UART0IrqHandler, LPC214x_UART1_PRIORITY, SOURCE_UART0);
#endif
#if USE_LPC214x_UART1
sdObjectInit(&SD2, NULL, notify2);
SetVICVector(UART1IrqHandler, LPC214x_UART2_PRIORITY, SOURCE_UART1);
#endif
}
/**
* @brief Low level serial driver configuration and (re)start.
*
* @param[in] sdp pointer to a @p SerialDriver object
* @param[in] config the architecture-dependent serial driver configuration.
* If this parameter is set to @p NULL then a default
* configuration is used.
*/
void sd_lld_start(SerialDriver *sdp, const SerialDriverConfig *config) {
if (config == NULL)
config = &default_config;
#if USE_LPC214x_UART1
if (&SD1 == sdp) {
PCONP = (PCONP & PCALL) | PCUART0;
uart_init(U0Base, config);
VICIntEnable = INTMASK(SOURCE_UART0);
return;
}
#endif
#if USE_LPC214x_UART2
if (&SD2 == sdp) {
PCONP = (PCONP & PCALL) | PCUART1;
uart_init(U1Base, config);
VICIntEnable = INTMASK(SOURCE_UART1);
return;
}
#endif
}
/**
* @brief Low level serial driver stop.
* @details De-initializes the UART, stops the associated clock, resets the
* interrupt vector.
*
* @param[in] sdp pointer to a @p SerialDriver object
*/
void sd_lld_stop(SerialDriver *sdp) {
#if USE_LPC214x_UART1
if (&SD1 == sdp) {
uart_deinit(U0Base);
PCONP = (PCONP & PCALL) & ~PCUART0;
VICIntEnClear = INTMASK(SOURCE_UART0);
return;
}
#endif
#if USE_LPC214x_UART2
if (&SD2 == sdp) {
uart_deinit(U1Base);
PCONP = (PCONP & PCALL) & ~PCUART1;
VICIntEnClear = INTMASK(SOURCE_UART1);
return;
}
#endif
}
#endif /* CH_HAL_USE_SERIAL */
/** @} */
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