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

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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 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 SERIAL
* @{
*/
#include "ch.h"
#include "hal.h"
#if 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 SerialConfig default_config = {
SERIAL_DEFAULT_BITRATE,
LCR_WL8 | LCR_STOP1 | LCR_NOPARITY,
FCR_TRIGGER0
};
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief UART initialization.
*
* @param[in] sdp communication channel associated to the UART
* @param[in] config the architecture-dependent serial driver configuration
*/
static void uart_init(SerialDriver *sdp, const SerialConfig *config) {
UART *u = sdp->uart;
uint32_t div = PCLK / (config->sc_speed << 4);
u->UART_LCR = config->sc_lcr | LCR_DLAB;
u->UART_DLL = div;
u->UART_DLM = div >> 8;
u->UART_LCR = config->sc_lcr;
u->UART_FCR = FCR_ENABLE | FCR_RXRESET | FCR_TXRESET | config->sc_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_LCR = LCR_DLAB;
u->UART_DLL = 1;
u->UART_DLM = 0;
u->UART_LCR = 0;
u->UART_FDR = 0x10;
u->UART_IER = 0;
u->UART_FCR = FCR_RXRESET | FCR_TXRESET;
u->UART_ACR = 0;
u->UART_TER = TER_ENABLE;
}
/**
* @brief Error handling routine.
*
* @param[in] sdp communication channel associated to the UART
* @param[in] err UART LSR register value
*/
static void set_error(SerialDriver *sdp, IOREG32 err) {
ioflags_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();
chIOAddFlagsI(sdp, sts);
chSysUnlockFromIsr();
}
#if defined(__GNUC__)
__attribute__((noinline))
#endif
/**
* @brief Common IRQ handler.
* @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.
*
* @param[in] sdp communication channel associated to the UART
*/
static void serve_interrupt(SerialDriver *sdp) {
UART *u = sdp->uart;
while (TRUE) {
switch (u->UART_IIR & IIR_SRC_MASK) {
case IIR_SRC_NONE:
return;
case IIR_SRC_ERROR:
set_error(sdp, u->UART_LSR);
break;
case IIR_SRC_TIMEOUT:
case IIR_SRC_RX:
chSysLockFromIsr();
if (chIQIsEmptyI(&sdp->iqueue))
chIOAddFlagsI(sdp, IO_INPUT_AVAILABLE);
chSysUnlockFromIsr();
while (u->UART_LSR & LSR_RBR_FULL) {
chSysLockFromIsr();
if (chIQPutI(&sdp->iqueue, u->UART_RBR) < Q_OK)
chIOAddFlagsI(sdp, SD_OVERRUN_ERROR);
chSysUnlockFromIsr();
}
break;
case IIR_SRC_TX:
{
int i = LPC214x_UART_FIFO_PRELOAD;
do {
msg_t b;
chSysLockFromIsr();
b = chOQGetI(&sdp->oqueue);
chSysUnlockFromIsr();
if (b < Q_OK) {
u->UART_IER &= ~IER_THRE;
chSysLockFromIsr();
chIOAddFlagsI(sdp, IO_OUTPUT_EMPTY);
chSysUnlockFromIsr();
break;
}
u->UART_THR = b;
} while (--i);
}
break;
default:
(void) u->UART_THR;
(void) u->UART_RBR;
}
}
}
/**
* @brief Attempts a TX FIFO preload.
*/
static void preload(SerialDriver *sdp) {
UART *u = sdp->uart;
if (u->UART_LSR & LSR_THRE) {
int i = LPC214x_UART_FIFO_PRELOAD;
do {
msg_t b = chOQGetI(&sdp->oqueue);
if (b < Q_OK) {
chIOAddFlagsI(sdp, IO_OUTPUT_EMPTY);
return;
}
u->UART_THR = b;
} while (--i);
}
u->UART_IER |= IER_THRE;
}
/**
* @brief Driver SD1 output notification.
*/
#if USE_LPC214x_UART0 || defined(__DOXYGEN__)
static void notify1(GenericQueue *qp) {
(void)qp;
preload(&SD1);
}
#endif
/**
* @brief Driver SD2 output notification.
*/
#if USE_LPC214x_UART1 || defined(__DOXYGEN__)
static void notify2(GenericQueue *qp) {
(void)qp;
preload(&SD2);
}
#endif
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/**
* @brief UART0 IRQ handler.
*
* @isr
*/
#if USE_LPC214x_UART0 || defined(__DOXYGEN__)
CH_IRQ_HANDLER(UART0IrqHandler) {
CH_IRQ_PROLOGUE();
serve_interrupt(&SD1);
VICVectAddr = 0;
CH_IRQ_EPILOGUE();
}
#endif
/**
* @brief UART1 IRQ handler.
*
* @isr
*/
#if USE_LPC214x_UART1 || defined(__DOXYGEN__)
CH_IRQ_HANDLER(UART1IrqHandler) {
CH_IRQ_PROLOGUE();
serve_interrupt(&SD2);
VICVectAddr = 0;
CH_IRQ_EPILOGUE();
}
#endif
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Low level serial driver initialization.
*
* @notapi
*/
void sd_lld_init(void) {
#if USE_LPC214x_UART0
sdObjectInit(&SD1, NULL, notify1);
SD1.uart = U0Base;
SetVICVector(UART0IrqHandler, LPC214x_UART0_PRIORITY, SOURCE_UART0);
#endif
#if USE_LPC214x_UART1
sdObjectInit(&SD2, NULL, notify2);
SD2.uart = U1Base;
SetVICVector(UART1IrqHandler, LPC214x_UART1_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.
*
* @notapi
*/
void sd_lld_start(SerialDriver *sdp, const SerialConfig *config) {
if (config == NULL)
config = &default_config;
if (sdp->state == SD_STOP) {
#if USE_LPC214x_UART0
if (&SD1 == sdp) {
PCONP = (PCONP & PCALL) | PCUART0;
VICIntEnable = INTMASK(SOURCE_UART0);
}
#endif
#if USE_LPC214x_UART1
if (&SD2 == sdp) {
PCONP = (PCONP & PCALL) | PCUART1;
VICIntEnable = INTMASK(SOURCE_UART1);
}
#endif
}
uart_init(sdp, config);
}
/**
* @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
*
* @notapi
*/
void sd_lld_stop(SerialDriver *sdp) {
if (sdp->state == SD_READY) {
uart_deinit(sdp->uart);
#if USE_LPC214x_UART0
if (&SD1 == sdp) {
PCONP = (PCONP & PCALL) & ~PCUART0;
VICIntEnClear = INTMASK(SOURCE_UART0);
return;
}
#endif
#if USE_LPC214x_UART1
if (&SD2 == sdp) {
PCONP = (PCONP & PCALL) & ~PCUART1;
VICIntEnClear = INTMASK(SOURCE_UART1);
return;
}
#endif
}
}
#endif /* HAL_USE_SERIAL */
/** @} */
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