mirror of
https://github.com/portapack-mayhem/mayhem-firmware.git
synced 2024-12-24 16:47:49 +00:00
353 lines
9.3 KiB
C
Executable File
353 lines
9.3 KiB
C
Executable File
/*
|
|
ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
/**
|
|
* @file LPC8xx/serial_lld.c
|
|
* @brief LPC8xx low level serial driver code.
|
|
*
|
|
* @addtogroup SERIAL
|
|
* @{
|
|
*/
|
|
|
|
#include "ch.h"
|
|
#include "hal.h"
|
|
|
|
#if HAL_USE_SERIAL || defined(__DOXYGEN__)
|
|
|
|
/*===========================================================================*/
|
|
/* Driver exported variables. */
|
|
/*===========================================================================*/
|
|
|
|
#if LPC8xx_SERIAL_USE_UART0 || defined(__DOXYGEN__)
|
|
/** @brief UART0 serial driver identifier.*/
|
|
SerialDriver SD1;
|
|
#endif
|
|
|
|
#if LPC8xx_SERIAL_USE_UART1 || defined(__DOXYGEN__)
|
|
/** @brief UART1 serial driver identifier.*/
|
|
SerialDriver SD2;
|
|
#endif
|
|
|
|
#if LPC8xx_SERIAL_USE_UART2 || defined(__DOXYGEN__)
|
|
/** @brief UART2 serial driver identifier.*/
|
|
SerialDriver SD3;
|
|
#endif
|
|
|
|
/*===========================================================================*/
|
|
/* Driver local variables. */
|
|
/*===========================================================================*/
|
|
|
|
/** @brief Driver default configuration.*/
|
|
static const SerialConfig default_config = {
|
|
SERIAL_DEFAULT_BITRATE,
|
|
(CFG_DL8 | CFG_NOPARITY | CFG_STOP1)
|
|
};
|
|
|
|
/*===========================================================================*/
|
|
/* Driver local functions. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief Error handling routine.
|
|
*
|
|
* @param[in] sdp communication channel associated to the UART
|
|
* @param[in] err UART STAT register value
|
|
*/
|
|
static void set_error(SerialDriver *sdp, IOREG32 err) {
|
|
flagsmask_t sts = 0;
|
|
|
|
if (err & STAT_OVERRUN)
|
|
sts |= SD_OVERRUN_ERROR;
|
|
if (err & STAT_PARITYERR)
|
|
sts |= SD_PARITY_ERROR;
|
|
if (err & STAT_FRAMERR)
|
|
sts |= SD_FRAMING_ERROR;
|
|
if (err & STAT_RXBRK)
|
|
sts |= SD_BREAK_DETECTED;
|
|
|
|
chSysLockFromIsr();
|
|
chnAddFlagsI(sdp, sts);
|
|
chSysUnlockFromIsr();
|
|
}
|
|
|
|
/**
|
|
* @brief Common IRQ handler.
|
|
* @note Tries hard to clear all the pending interrupt sources, we don't
|
|
* want to go through the whole ISR and have another interrupt soon
|
|
* after.
|
|
*
|
|
* @param[in] u pointer to an UART I/O block
|
|
* @param[in] sdp communication channel associated to the UART
|
|
*/
|
|
static void serve_interrupt(SerialDriver *sdp) {
|
|
LPC_USART_TypeDef *u = sdp->uart;
|
|
|
|
while (u->INTSTAT) {
|
|
|
|
if (u->INTSTAT & STAT_RXRDY) {
|
|
chSysLockFromIsr();
|
|
if (chIQIsEmptyI(&sdp->iqueue))
|
|
chnAddFlagsI(sdp, CHN_INPUT_AVAILABLE);
|
|
if (chIQPutI(&sdp->iqueue, u->RXDATA) < Q_OK)
|
|
chnAddFlagsI(sdp, SD_OVERRUN_ERROR);
|
|
chSysUnlockFromIsr();
|
|
}
|
|
|
|
if (u->INTSTAT & STAT_TXRDY) {
|
|
msg_t b;
|
|
|
|
chSysLockFromIsr();
|
|
b = chOQGetI(&sdp->oqueue);
|
|
chSysUnlockFromIsr();
|
|
|
|
if (b < Q_OK) {
|
|
u->INTENCLR = STAT_TXRDY;
|
|
chSysLockFromIsr();
|
|
chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
|
|
chSysUnlockFromIsr();
|
|
break;
|
|
}
|
|
else {
|
|
u->TXDATA = b;
|
|
}
|
|
}
|
|
|
|
if (u->INTSTAT & (STAT_OVERRUN | STAT_DELTARXBRK |
|
|
STAT_FRAMERR | STAT_PARITYERR) ) {
|
|
IOREG32 stat = u->STAT;
|
|
set_error(sdp, stat);
|
|
u->STAT = stat;
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Attempts a TX preload.
|
|
*/
|
|
static void preload(SerialDriver *sdp) {
|
|
LPC_USART_TypeDef *u = sdp->uart;
|
|
|
|
if (u->STAT & STAT_TXIDLE) {
|
|
msg_t b = chOQGetI(&sdp->oqueue);
|
|
if (b < Q_OK) {
|
|
chnAddFlagsI(sdp, CHN_OUTPUT_EMPTY);
|
|
return;
|
|
}
|
|
u->TXDATA = b;
|
|
}
|
|
u->INTENSET = STAT_TXRDY;
|
|
}
|
|
|
|
/**
|
|
* @brief Driver output notification.
|
|
*/
|
|
#if LPC8xx_SERIAL_USE_UART0 || defined(__DOXYGEN__)
|
|
static void notify1(GenericQueue *qp) {
|
|
|
|
(void)qp;
|
|
preload(&SD1);
|
|
}
|
|
#endif
|
|
|
|
#if LPC8xx_SERIAL_USE_UART1 || defined(__DOXYGEN__)
|
|
static void notify2(GenericQueue *qp) {
|
|
|
|
(void)qp;
|
|
preload(&SD2);
|
|
}
|
|
#endif
|
|
|
|
#if LPC8xx_SERIAL_USE_UART2 || defined(__DOXYGEN__)
|
|
static void notify3(GenericQueue *qp) {
|
|
|
|
(void)qp;
|
|
preload(&SD3);
|
|
}
|
|
#endif
|
|
|
|
/*===========================================================================*/
|
|
/* Driver interrupt handlers. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief UARTn IRQ handlers.
|
|
*
|
|
* @isr
|
|
*/
|
|
#if LPC8xx_SERIAL_USE_UART0 || defined(__DOXYGEN__)
|
|
CH_IRQ_HANDLER(Vector4C) {
|
|
|
|
CH_IRQ_PROLOGUE();
|
|
serve_interrupt( &SD1 );
|
|
CH_IRQ_EPILOGUE();
|
|
}
|
|
#endif
|
|
#if LPC8xx_SERIAL_USE_UART1 || defined(__DOXYGEN__)
|
|
CH_IRQ_HANDLER(Vector50) {
|
|
|
|
CH_IRQ_PROLOGUE();
|
|
serve_interrupt( &SD2 );
|
|
CH_IRQ_EPILOGUE();
|
|
}
|
|
#endif
|
|
#if LPC8xx_SERIAL_USE_UART2 || defined(__DOXYGEN__)
|
|
CH_IRQ_HANDLER(Vector54) {
|
|
|
|
CH_IRQ_PROLOGUE();
|
|
serve_interrupt( &SD3 );
|
|
CH_IRQ_EPILOGUE();
|
|
}
|
|
#endif
|
|
|
|
/*===========================================================================*/
|
|
/* Driver exported functions. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief Low level serial driver initialization.
|
|
*
|
|
* @notapi
|
|
*/
|
|
void sd_lld_init(void) {
|
|
|
|
#if LPC8xx_SERIAL_USE_UART0
|
|
sdObjectInit(&SD1, NULL, notify1);
|
|
SD1.uart = LPC_USART0;
|
|
#endif
|
|
|
|
#if LPC8xx_SERIAL_USE_UART1
|
|
sdObjectInit(&SD2, NULL, notify2);
|
|
SD2.uart = LPC_USART1;
|
|
#endif
|
|
|
|
#if LPC8xx_SERIAL_USE_UART2
|
|
sdObjectInit(&SD3, NULL, notify3);
|
|
SD3.uart = LPC_USART2;
|
|
#endif
|
|
|
|
/* Reset fractional baudrate generator */
|
|
LPC_SYSCON->PRESETCTRL &= ~(1<<2);
|
|
LPC_SYSCON->PRESETCTRL |= (1<<2);
|
|
|
|
LPC_SYSCON->UARTCLKDIV = LPC8xx_SERIAL_UARTCLKDIV;
|
|
LPC_SYSCON->UARTFRGDIV = LPC8xx_SERIAL_UARTFRGDIV;
|
|
LPC_SYSCON->UARTFRGMULT = LPC8xx_SERIAL_UARTFRGMULT;
|
|
|
|
}
|
|
|
|
/**
|
|
* @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 LPC8xx_SERIAL_USE_UART0
|
|
if (&SD1 == sdp) {
|
|
LPC_SYSCON->SYSAHBCLKCTRL |= (1<<14); // Enable Clk
|
|
LPC_SYSCON->PRESETCTRL &= ~(1<<3); // Reset peripheral
|
|
LPC_SYSCON->PRESETCTRL |= (1<<3);
|
|
nvicEnableVector(UART0_IRQn,
|
|
CORTEX_PRIORITY_MASK(LPC8xx_SERIAL_UART0_IRQ_PRIORITY));
|
|
}
|
|
#endif
|
|
|
|
#if LPC8xx_SERIAL_USE_UART1
|
|
if (&SD2 == sdp) {
|
|
LPC_SYSCON->SYSAHBCLKCTRL |= (1<<15); // Enable Clk
|
|
LPC_SYSCON->PRESETCTRL &= ~(1<<4); // Reset peripheral
|
|
LPC_SYSCON->PRESETCTRL |= (1<<4);
|
|
nvicEnableVector(UART1_IRQn,
|
|
CORTEX_PRIORITY_MASK(LPC8xx_SERIAL_UART1_IRQ_PRIORITY));
|
|
}
|
|
#endif
|
|
|
|
#if LPC8xx_SERIAL_USE_UART2
|
|
if (&SD3 == sdp) {
|
|
LPC_SYSCON->SYSAHBCLKCTRL |= (1<<16); // Enable Clk
|
|
LPC_SYSCON->PRESETCTRL &= ~(1<<5); // Reset peripheral
|
|
LPC_SYSCON->PRESETCTRL |= (1<<5);
|
|
nvicEnableVector(UART2_IRQn,
|
|
CORTEX_PRIORITY_MASK(LPC8xx_SERIAL_UART2_IRQ_PRIORITY));
|
|
}
|
|
#endif
|
|
|
|
}
|
|
|
|
sdp->uart->BRG = (LPC8xx_SERIAL_U_PCLK / (config->sc_speed << 4)) -1;
|
|
sdp->uart->INTENSET = STAT_FRAMERR | STAT_OVERRUN |
|
|
STAT_PARITYERR | STAT_DELTARXBRK |
|
|
STAT_RXRDY;
|
|
sdp->uart->CFG = config->sc_cfg | CFG_ENA;
|
|
}
|
|
|
|
/**
|
|
* @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) {
|
|
sdp->uart->INTENCLR = STAT_TXRDY | STAT_RXRDY;
|
|
sdp->uart->CFG = 0;
|
|
|
|
#if LPC8xx_SERIAL_USE_UART0
|
|
if (&SD1 == sdp) {
|
|
LPC_SYSCON->SYSAHBCLKCTRL &= ~(1<<12);
|
|
nvicDisableVector(UART0_IRQn);
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
#if LPC8xx_SERIAL_USE_UART1
|
|
if (&SD2 == sdp) {
|
|
LPC_SYSCON->SYSAHBCLKCTRL &= ~(1<<13);
|
|
nvicDisableVector(UART1_IRQn);
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
#if LPC8xx_SERIAL_USE_UART2
|
|
if (&SD3 == sdp) {
|
|
LPC_SYSCON->SYSAHBCLKCTRL &= ~(1<<14);
|
|
nvicDisableVector(UART2_IRQn);
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
}
|
|
}
|
|
|
|
#endif /* HAL_USE_SERIAL */
|
|
|
|
/** @} */
|