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OpenModem/bertos/cpu/arm/drv/ser_at91.c

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/**
* \file
* <!--
* This file is part of BeRTOS.
*
* Bertos 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 2 of the License, or
* (at your option) any later version.
*
* This program 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As a special exception, you may use this file as part of a free software
* library without restriction. Specifically, if other files instantiate
* templates or use macros or inline functions from this file, or you compile
* this file and link it with other files to produce an executable, this
* file does not by itself cause the resulting executable to be covered by
* the GNU General Public License. This exception does not however
* invalidate any other reasons why the executable file might be covered by
* the GNU General Public License.
*
* Copyright 2003, 2004 Develer S.r.l. (http://www.develer.com/)
* Copyright 2000 Bernie Innocenti <bernie@codewiz.org>
*
* -->
*
* \brief ARM UART and SPI I/O driver
*
*
* \author Daniele Basile <asterix@develer.com>
*/
#include "hw/hw_ser.h" /* Required for bus macros overrides */
#include <hw/hw_cpufreq.h> /* CPU_FREQ */
#include "cfg/cfg_ser.h"
#include <cfg/debug.h>
#include <io/arm.h>
#include <cpu/attr.h>
#include <drv/ser.h>
#include <drv/ser_p.h>
#include <struct/fifobuf.h>
#define SERIRQ_PRIORITY 4 ///< default priority for serial irqs.
/**
* \name Overridable serial bus hooks
*
* These can be redefined in hw.h to implement
* special bus policies such as half-duplex, 485, etc.
*
*
* \code
* TXBEGIN TXCHAR TXEND TXOFF
* | __________|__________ | |
* | | | | | | | | |
* v v v v v v v v v
* ______ __ __ __ __ __ __ ________________
* \/ \/ \/ \/ \/ \/ \/
* ______/\__/\__/\__/\__/\__/\__/
*
* \endcode
*
* \{
*/
#ifndef SER_UART0_BUS_TXINIT
/**
* Default TXINIT macro - invoked in uart0_init()
*
* - Disable GPIO on USART0 tx/rx pins
*/
#if !CPU_ARM_SAM7S_LARGE && !CPU_ARM_SAM7X
#warning Check USART0 pins!
#endif
#define SER_UART0_BUS_TXINIT do { \
PIOA_PDR = BV(RXD0) | BV(TXD0); \
} while (0)
#endif
#ifndef SER_UART0_BUS_TXBEGIN
/**
* Invoked before starting a transmission
*/
#define SER_UART0_BUS_TXBEGIN
#endif
#ifndef SER_UART0_BUS_TXCHAR
/**
* Invoked to send one character.
*/
#define SER_UART0_BUS_TXCHAR(c) do { \
US0_THR = (c); \
} while (0)
#endif
#ifndef SER_UART0_BUS_TXEND
/**
* Invoked as soon as the txfifo becomes empty
*/
#define SER_UART0_BUS_TXEND
#endif
/* End USART0 macros */
#ifndef SER_UART1_BUS_TXINIT
/**
* Default TXINIT macro - invoked in uart1_init()
*
* - Disable GPIO on USART1 tx/rx pins
*/
#if !CPU_ARM_SAM7S_LARGE && !CPU_ARM_SAM7X
#warning Check USART1 pins!
#endif
#define SER_UART1_BUS_TXINIT do { \
PIOA_PDR = BV(RXD1) | BV(TXD1); \
} while (0)
#endif
#ifndef SER_UART1_BUS_TXBEGIN
/**
* Invoked before starting a transmission
*/
#define SER_UART1_BUS_TXBEGIN
#endif
#ifndef SER_UART1_BUS_TXCHAR
/**
* Invoked to send one character.
*/
#define SER_UART1_BUS_TXCHAR(c) do { \
US1_THR = (c); \
} while (0)
#endif
#ifndef SER_UART1_BUS_TXEND
/**
* Invoked as soon as the txfifo becomes empty
*/
#define SER_UART1_BUS_TXEND
#endif
/**
* \name Overridable SPI hooks
*
* These can be redefined in hw.h to implement
* special bus policies such as slave select pin handling, etc.
*
* \{
*/
#ifndef SER_SPI0_BUS_TXINIT
/**
* Default TXINIT macro - invoked in spi_init()
* The default is no action.
*/
#define SER_SPI0_BUS_TXINIT
#endif
#ifndef SER_SPI0_BUS_TXCLOSE
/**
* Invoked after the last character has been transmitted.
* The default is no action.
*/
#define SER_SPI0_BUS_TXCLOSE
#endif
#if CPU_ARM_SAM7X
#ifndef SER_SPI1_BUS_TXINIT
/**
* Default TXINIT macro - invoked in spi_init()
* The default is no action.
*/
#define SER_SPI1_BUS_TXINIT
#endif
#ifndef SER_SPI1_BUS_TXCLOSE
/**
* Invoked after the last character has been transmitted.
* The default is no action.
*/
#define SER_SPI1_BUS_TXCLOSE
#endif
#endif
/*\}*/
/* From the high-level serial driver */
extern struct Serial *ser_handles[SER_CNT];
/* TX and RX buffers */
static unsigned char uart0_txbuffer[CONFIG_UART0_TXBUFSIZE];
static unsigned char uart0_rxbuffer[CONFIG_UART0_RXBUFSIZE];
static unsigned char uart1_txbuffer[CONFIG_UART1_TXBUFSIZE];
static unsigned char uart1_rxbuffer[CONFIG_UART1_RXBUFSIZE];
static unsigned char spi0_txbuffer[CONFIG_SPI0_TXBUFSIZE];
static unsigned char spi0_rxbuffer[CONFIG_SPI0_RXBUFSIZE];
#if CPU_ARM_SAM7X
static unsigned char spi1_txbuffer[CONFIG_SPI1_TXBUFSIZE];
static unsigned char spi1_rxbuffer[CONFIG_SPI1_RXBUFSIZE];
#endif
/**
* Internal hardware state structure
*
* The \a sending variable is true while the transmission
* interrupt is retriggering itself.
*
* For the USARTs the \a sending flag is useful for taking specific
* actions before sending a burst of data, at the start of a trasmission
* but not before every char sent.
*
* For the SPI, this flag is necessary because the SPI sends and receives
* bytes at the same time and the SPI IRQ is unique for send/receive.
* The only way to start transmission is to write data in SPDR (this
* is done by spi_starttx()). We do this *only* if a transfer is
* not already started.
*/
struct ArmSerial
{
struct SerialHardware hw;
volatile bool sending;
};
static ISR_PROTO(uart0_irq_dispatcher);
static ISR_PROTO(uart1_irq_dispatcher);
static ISR_PROTO(spi0_irq_handler);
#if CPU_ARM_SAM7X
static ISR_PROTO(spi1_irq_handler);
#endif
/*
* Callbacks for USART0
*/
static void uart0_init(
UNUSED_ARG(struct SerialHardware *, _hw),
UNUSED_ARG(struct Serial *, ser))
{
US0_IDR = 0xFFFFFFFF;
/* Set the vector. */
AIC_SVR(US0_ID) = uart0_irq_dispatcher;
/* Initialize to level sensitive with defined priority. */
AIC_SMR(US0_ID) = AIC_SRCTYPE_INT_LEVEL_SENSITIVE | SERIRQ_PRIORITY;
PMC_PCER = BV(US0_ID);
/*
* - Reset USART0
* - Set serial param: mode Normal, 8bit data, 1bit stop, parity none
* - Enable both the receiver and the transmitter
* - Enable only the RX complete interrupt
*/
US0_CR = BV(US_RSTRX) | BV(US_RSTTX);
US0_MR = US_CHMODE_NORMAL | US_CHRL_8 | US_NBSTOP_1 | US_PAR_NO;
US0_CR = BV(US_RXEN) | BV(US_TXEN);
US0_IER = BV(US_RXRDY);
SER_UART0_BUS_TXINIT;
/* Enable the USART IRQ */
AIC_IECR = BV(US0_ID);
SER_STROBE_INIT;
}
static void uart0_cleanup(UNUSED_ARG(struct SerialHardware *, _hw))
{
US0_CR = BV(US_RSTRX) | BV(US_RSTTX) | BV(US_RXDIS) | BV(US_TXDIS) | BV(US_RSTSTA);
}
static void uart0_enabletxirq(struct SerialHardware *_hw)
{
struct ArmSerial *hw = (struct ArmSerial *)_hw;
/*
* WARNING: racy code here! The tx interrupt sets hw->sending to false
* when it runs with an empty fifo. The order of statements in the
* if-block matters.
*/
if (!hw->sending)
{
hw->sending = true;
/*
* - Enable the transmitter
* - Enable TX empty interrupt
*/
SER_UART0_BUS_TXBEGIN;
US0_IER = BV(US_TXEMPTY);
}
}
static void uart0_setbaudrate(UNUSED_ARG(struct SerialHardware *, _hw), unsigned long rate)
{
/* Compute baud-rate period */
US0_BRGR = CPU_FREQ / (16 * rate);
//DB(kprintf("uart0_setbaudrate(rate=%lu): period=%d\n", rate, period);)
}
static void uart0_setparity(UNUSED_ARG(struct SerialHardware *, _hw), int parity)
{
US0_MR &= ~US_PAR_MASK;
/* Set UART parity */
switch(parity)
{
case SER_PARITY_NONE:
{
/* Parity none. */
US0_MR |= US_PAR_NO;
break;
}
case SER_PARITY_EVEN:
{
/* Even parity. */
US0_MR |= US_PAR_EVEN;
break;
}
case SER_PARITY_ODD:
{
/* Odd parity. */
US0_MR |= US_PAR_ODD;
break;
}
default:
ASSERT(0);
}
}
/*
* Callbacks for USART1
*/
static void uart1_init(
UNUSED_ARG(struct SerialHardware *, _hw),
UNUSED_ARG(struct Serial *, ser))
{
US1_IDR = 0xFFFFFFFF;
/* Set the vector. */
AIC_SVR(US1_ID) = uart1_irq_dispatcher;
/* Initialize to level sensitive with defined priority. */
AIC_SMR(US1_ID) = AIC_SRCTYPE_INT_LEVEL_SENSITIVE | SERIRQ_PRIORITY;
PMC_PCER = BV(US1_ID);
/*
* - Reset USART1
* - Set serial param: mode Normal, 8bit data, 1bit stop, parity none
* - Enable both the receiver and the transmitter
* - Enable only the RX complete interrupt
*/
US1_CR = BV(US_RSTRX) | BV(US_RSTTX);
US1_MR = US_CHMODE_NORMAL | US_CHRL_8 | US_NBSTOP_1 | US_PAR_NO;
US1_CR = BV(US_RXEN) | BV(US_TXEN);
US1_IER = BV(US_RXRDY);
SER_UART1_BUS_TXINIT;
/* Enable the USART IRQ */
AIC_IECR = BV(US1_ID);
SER_STROBE_INIT;
}
static void uart1_cleanup(UNUSED_ARG(struct SerialHardware *, _hw))
{
US1_CR = BV(US_RSTRX) | BV(US_RSTTX) | BV(US_RXDIS) | BV(US_TXDIS) | BV(US_RSTSTA);
}
static void uart1_enabletxirq(struct SerialHardware *_hw)
{
struct ArmSerial *hw = (struct ArmSerial *)_hw;
/*
* WARNING: racy code here! The tx interrupt sets hw->sending to false
* when it runs with an empty fifo. The order of statements in the
* if-block matters.
*/
if (!hw->sending)
{
hw->sending = true;
/*
* - Enable the transmitter
* - Enable TX empty interrupt
*/
SER_UART1_BUS_TXBEGIN;
US1_IER = BV(US_TXEMPTY);
}
}
static void uart1_setbaudrate(UNUSED_ARG(struct SerialHardware *, _hw), unsigned long rate)
{
/* Compute baud-rate period */
US1_BRGR = CPU_FREQ / (16 * rate);
//DB(kprintf("uart0_setbaudrate(rate=%lu): period=%d\n", rate, period);)
}
static void uart1_setparity(UNUSED_ARG(struct SerialHardware *, _hw), int parity)
{
US1_MR &= ~US_PAR_MASK;
/* Set UART parity */
switch(parity)
{
case SER_PARITY_NONE:
{
/* Parity none. */
US1_MR |= US_PAR_NO;
break;
}
case SER_PARITY_EVEN:
{
/* Even parity. */
US1_MR |= US_PAR_EVEN;
break;
}
case SER_PARITY_ODD:
{
/* Odd parity. */
US1_MR |= US_PAR_ODD;
break;
}
default:
ASSERT(0);
}
}
/* SPI driver */
static void spi0_init(UNUSED_ARG(struct SerialHardware *, _hw), UNUSED_ARG(struct Serial *, ser))
{
/* Disable PIO on SPI pins */
PIOA_PDR = BV(SPI0_SPCK) | BV(SPI0_MOSI) | BV(SPI0_MISO);
/* Reset device */
SPI0_CR = BV(SPI_SWRST);
/*
* Set SPI to master mode, fixed peripheral select, chip select directly connected to a peripheral device,
* SPI clock set to MCK, mode fault detection disabled, loopback disable, NPCS0 active, Delay between CS = 0
*/
SPI0_MR = BV(SPI_MSTR) | BV(SPI_MODFDIS);
/*
* Set SPI mode.
* At reset clock division factor is set to 0, that is
* *forbidden*. Set SPI clock to minimum to keep it valid.
*/
SPI0_CSR0 = BV(SPI_NCPHA) | (255 << SPI_SCBR_SHIFT);
/* Disable all irqs */
SPI0_IDR = 0xFFFFFFFF;
/* Set the vector. */
AIC_SVR(SPI0_ID) = spi0_irq_handler;
/* Initialize to edge triggered with defined priority. */
AIC_SMR(SPI0_ID) = AIC_SRCTYPE_INT_EDGE_TRIGGERED | SERIRQ_PRIORITY;
/* Enable the USART IRQ */
AIC_IECR = BV(SPI0_ID);
PMC_PCER = BV(SPI0_ID);
/* Enable interrupt on tx buffer empty */
SPI0_IER = BV(SPI_TXEMPTY);
/* Enable SPI */
SPI0_CR = BV(SPI_SPIEN);
SER_SPI0_BUS_TXINIT;
SER_STROBE_INIT;
}
static void spi0_cleanup(UNUSED_ARG(struct SerialHardware *, _hw))
{
/* Disable SPI */
SPI0_CR = BV(SPI_SPIDIS);
/* Disable all irqs */
SPI0_IDR = 0xFFFFFFFF;
SER_SPI0_BUS_TXCLOSE;
/* Enable PIO on SPI pins */
PIOA_PER = BV(SPI0_SPCK) | BV(SPI0_MOSI) | BV(SPI0_MISO);
}
static void spi0_starttx(struct SerialHardware *_hw)
{
struct ArmSerial *hw = (struct ArmSerial *)_hw;
cpu_flags_t flags;
IRQ_SAVE_DISABLE(flags);
/* Send data only if the SPI is not already transmitting */
if (!hw->sending && !fifo_isempty(&ser_handles[SER_SPI0]->txfifo))
{
hw->sending = true;
SPI0_TDR = fifo_pop(&ser_handles[SER_SPI0]->txfifo);
}
IRQ_RESTORE(flags);
}
static void spi0_setbaudrate(UNUSED_ARG(struct SerialHardware *, _hw), unsigned long rate)
{
SPI0_CSR0 &= ~SPI_SCBR;
ASSERT((uint8_t)DIV_ROUND(CPU_FREQ, rate));
SPI0_CSR0 |= DIV_ROUND(CPU_FREQ, rate) << SPI_SCBR_SHIFT;
}
#if CPU_ARM_SAM7X
/* SPI driver */
static void spi1_init(UNUSED_ARG(struct SerialHardware *, _hw), UNUSED_ARG(struct Serial *, ser))
{
/* Disable PIO on SPI pins */
PIOA_PDR = BV(SPI1_SPCK) | BV(SPI1_MOSI) | BV(SPI1_MISO);
/* SPI1 pins are on B peripheral function! */
PIOA_BSR = BV(SPI1_SPCK) | BV(SPI1_MOSI) | BV(SPI1_MISO);
/* Reset device */
SPI1_CR = BV(SPI_SWRST);
/*
* Set SPI to master mode, fixed peripheral select, chip select directly connected to a peripheral device,
* SPI clock set to MCK, mode fault detection disabled, loopback disable, NPCS0 active, Delay between CS = 0
*/
SPI1_MR = BV(SPI_MSTR) | BV(SPI_MODFDIS);
/*
* Set SPI mode.
* At reset clock division factor is set to 0, that is
* *forbidden*. Set SPI clock to minimum to keep it valid.
*/
SPI1_CSR0 = BV(SPI_NCPHA) | (255 << SPI_SCBR_SHIFT);
/* Disable all irqs */
SPI1_IDR = 0xFFFFFFFF;
/* Set the vector. */
AIC_SVR(SPI1_ID) = spi1_irq_handler;
/* Initialize to edge triggered with defined priority. */
AIC_SMR(SPI1_ID) = AIC_SRCTYPE_INT_EDGE_TRIGGERED | SERIRQ_PRIORITY;
/* Enable the USART IRQ */
AIC_IECR = BV(SPI1_ID);
PMC_PCER = BV(SPI1_ID);
/* Enable interrupt on tx buffer empty */
SPI1_IER = BV(SPI_TXEMPTY);
/* Enable SPI */
SPI1_CR = BV(SPI_SPIEN);
SER_SPI1_BUS_TXINIT;
SER_STROBE_INIT;
}
static void spi1_cleanup(UNUSED_ARG(struct SerialHardware *, _hw))
{
/* Disable SPI */
SPI1_CR = BV(SPI_SPIDIS);
/* Disable all irqs */
SPI1_IDR = 0xFFFFFFFF;
SER_SPI1_BUS_TXCLOSE;
/* Enable PIO on SPI pins */
PIOA_PER = BV(SPI1_SPCK) | BV(SPI1_MOSI) | BV(SPI1_MISO);
}
static void spi1_starttx(struct SerialHardware *_hw)
{
struct ArmSerial *hw = (struct ArmSerial *)_hw;
cpu_flags_t flags;
IRQ_SAVE_DISABLE(flags);
/* Send data only if the SPI is not already transmitting */
if (!hw->sending && !fifo_isempty(&ser_handles[SER_SPI1]->txfifo))
{
hw->sending = true;
SPI1_TDR = fifo_pop(&ser_handles[SER_SPI1]->txfifo);
}
IRQ_RESTORE(flags);
}
static void spi1_setbaudrate(UNUSED_ARG(struct SerialHardware *, _hw), unsigned long rate)
{
SPI1_CSR0 &= ~SPI_SCBR;
ASSERT((uint8_t)DIV_ROUND(CPU_FREQ, rate));
SPI1_CSR0 |= DIV_ROUND(CPU_FREQ, rate) << SPI_SCBR_SHIFT;
}
#endif
static void spi_setparity(UNUSED_ARG(struct SerialHardware *, _hw), UNUSED_ARG(int, parity))
{
// nop
}
static bool tx_sending(struct SerialHardware* _hw)
{
struct ArmSerial *hw = (struct ArmSerial *)_hw;
return hw->sending;
}
// FIXME: move into compiler.h? Ditch?
#if COMPILER_C99
#define C99INIT(name,val) .name = val
#elif defined(__GNUC__)
#define C99INIT(name,val) name: val
#else
#warning No designated initializers, double check your code
#define C99INIT(name,val) (val)
#endif
/*
* High-level interface data structures
*/
static const struct SerialHardwareVT UART0_VT =
{
C99INIT(init, uart0_init),
C99INIT(cleanup, uart0_cleanup),
C99INIT(setBaudrate, uart0_setbaudrate),
C99INIT(setParity, uart0_setparity),
C99INIT(txStart, uart0_enabletxirq),
C99INIT(txSending, tx_sending),
};
static const struct SerialHardwareVT UART1_VT =
{
C99INIT(init, uart1_init),
C99INIT(cleanup, uart1_cleanup),
C99INIT(setBaudrate, uart1_setbaudrate),
C99INIT(setParity, uart1_setparity),
C99INIT(txStart, uart1_enabletxirq),
C99INIT(txSending, tx_sending),
};
static const struct SerialHardwareVT SPI0_VT =
{
C99INIT(init, spi0_init),
C99INIT(cleanup, spi0_cleanup),
C99INIT(setBaudrate, spi0_setbaudrate),
C99INIT(setParity, spi_setparity),
C99INIT(txStart, spi0_starttx),
C99INIT(txSending, tx_sending),
};
#if CPU_ARM_SAM7X
static const struct SerialHardwareVT SPI1_VT =
{
C99INIT(init, spi1_init),
C99INIT(cleanup, spi1_cleanup),
C99INIT(setBaudrate, spi1_setbaudrate),
C99INIT(setParity, spi_setparity),
C99INIT(txStart, spi1_starttx),
C99INIT(txSending, tx_sending),
};
#endif
static struct ArmSerial UARTDescs[SER_CNT] =
{
{
C99INIT(hw, /**/) {
C99INIT(table, &UART0_VT),
C99INIT(txbuffer, uart0_txbuffer),
C99INIT(rxbuffer, uart0_rxbuffer),
C99INIT(txbuffer_size, sizeof(uart0_txbuffer)),
C99INIT(rxbuffer_size, sizeof(uart0_rxbuffer)),
},
C99INIT(sending, false),
},
{
C99INIT(hw, /**/) {
C99INIT(table, &UART1_VT),
C99INIT(txbuffer, uart1_txbuffer),
C99INIT(rxbuffer, uart1_rxbuffer),
C99INIT(txbuffer_size, sizeof(uart1_txbuffer)),
C99INIT(rxbuffer_size, sizeof(uart1_rxbuffer)),
},
C99INIT(sending, false),
},
{
C99INIT(hw, /**/) {
C99INIT(table, &SPI0_VT),
C99INIT(txbuffer, spi0_txbuffer),
C99INIT(rxbuffer, spi0_rxbuffer),
C99INIT(txbuffer_size, sizeof(spi0_txbuffer)),
C99INIT(rxbuffer_size, sizeof(spi0_rxbuffer)),
},
C99INIT(sending, false),
},
#if CPU_ARM_SAM7X
{
C99INIT(hw, /**/) {
C99INIT(table, &SPI1_VT),
C99INIT(txbuffer, spi1_txbuffer),
C99INIT(rxbuffer, spi1_rxbuffer),
C99INIT(txbuffer_size, sizeof(spi1_txbuffer)),
C99INIT(rxbuffer_size, sizeof(spi1_rxbuffer)),
},
C99INIT(sending, false),
}
#endif
};
struct SerialHardware *ser_hw_getdesc(int unit)
{
ASSERT(unit < SER_CNT);
return &UARTDescs[unit].hw;
}
/**
* Serial 0 TX interrupt handler
*/
INLINE void uart0_irq_tx(void)
{
SER_STROBE_ON;
struct FIFOBuffer * const txfifo = &ser_handles[SER_UART0]->txfifo;
if (fifo_isempty(txfifo))
{
/*
* - Disable the TX empty interrupts
*/
US0_IDR = BV(US_TXEMPTY);
SER_UART0_BUS_TXEND;
UARTDescs[SER_UART0].sending = false;
}
else
{
char c = fifo_pop(txfifo);
SER_UART0_BUS_TXCHAR(c);
}
SER_STROBE_OFF;
}
/**
* Serial 0 RX complete interrupt handler.
*/
INLINE void uart0_irq_rx(void)
{
SER_STROBE_ON;
/* Should be read before US_CRS */
ser_handles[SER_UART0]->status |= US0_CSR & (SERRF_RXSROVERRUN | SERRF_FRAMEERROR);
US0_CR = BV(US_RSTSTA);
char c = US0_RHR;
struct FIFOBuffer * const rxfifo = &ser_handles[SER_UART0]->rxfifo;
if (fifo_isfull(rxfifo))
ser_handles[SER_UART0]->status |= SERRF_RXFIFOOVERRUN;
else
fifo_push(rxfifo, c);
SER_STROBE_OFF;
}
/**
* Serial IRQ dispatcher for USART0.
*/
static DECLARE_ISR(uart0_irq_dispatcher)
{
if (US0_CSR & BV(US_RXRDY))
uart0_irq_rx();
if (US0_CSR & BV(US_TXEMPTY))
uart0_irq_tx();
/* Inform hw that we have served the IRQ */
AIC_EOICR = 0;
}
/**
* Serial 1 TX interrupt handler
*/
INLINE void uart1_irq_tx(void)
{
SER_STROBE_ON;
struct FIFOBuffer * const txfifo = &ser_handles[SER_UART1]->txfifo;
if (fifo_isempty(txfifo))
{
/*
* - Disable the TX empty interrupts
*/
US1_IDR = BV(US_TXEMPTY);
SER_UART1_BUS_TXEND;
UARTDescs[SER_UART1].sending = false;
}
else
{
char c = fifo_pop(txfifo);
SER_UART1_BUS_TXCHAR(c);
}
SER_STROBE_OFF;
}
/**
* Serial 1 RX complete interrupt handler.
*/
INLINE void uart1_irq_rx(void)
{
SER_STROBE_ON;
/* Should be read before US_CRS */
ser_handles[SER_UART1]->status |= US1_CSR & (SERRF_RXSROVERRUN | SERRF_FRAMEERROR);
US1_CR = BV(US_RSTSTA);
char c = US1_RHR;
struct FIFOBuffer * const rxfifo = &ser_handles[SER_UART1]->rxfifo;
if (fifo_isfull(rxfifo))
ser_handles[SER_UART1]->status |= SERRF_RXFIFOOVERRUN;
else
fifo_push(rxfifo, c);
SER_STROBE_OFF;
}
/**
* Serial IRQ dispatcher for USART1.
*/
static DECLARE_ISR(uart1_irq_dispatcher)
{
if (US1_CSR & BV(US_RXRDY))
uart1_irq_rx();
if (US1_CSR & BV(US_TXEMPTY))
uart1_irq_tx();
/* Inform hw that we have served the IRQ */
AIC_EOICR = 0;
}
/**
* SPI0 interrupt handler
*/
static DECLARE_ISR(spi0_irq_handler)
{
SER_STROBE_ON;
char c = SPI0_RDR;
/* Read incoming byte. */
if (!fifo_isfull(&ser_handles[SER_SPI0]->rxfifo))
fifo_push(&ser_handles[SER_SPI0]->rxfifo, c);
/*
* FIXME
else
ser_handles[SER_SPI0]->status |= SERRF_RXFIFOOVERRUN;
*/
/* Send */
if (!fifo_isempty(&ser_handles[SER_SPI0]->txfifo))
SPI0_TDR = fifo_pop(&ser_handles[SER_SPI0]->txfifo);
else
UARTDescs[SER_SPI0].sending = false;
/* Inform hw that we have served the IRQ */
AIC_EOICR = 0;
SER_STROBE_OFF;
}
#if CPU_ARM_SAM7X
/**
* SPI1 interrupt handler
*/
static DECLARE_ISR(spi1_irq_handler)
{
SER_STROBE_ON;
char c = SPI1_RDR;
/* Read incoming byte. */
if (!fifo_isfull(&ser_handles[SER_SPI1]->rxfifo))
fifo_push(&ser_handles[SER_SPI1]->rxfifo, c);
/*
* FIXME
else
ser_handles[SER_SPI1]->status |= SERRF_RXFIFOOVERRUN;
*/
/* Send */
if (!fifo_isempty(&ser_handles[SER_SPI1]->txfifo))
SPI1_TDR = fifo_pop(&ser_handles[SER_SPI1]->txfifo);
else
UARTDescs[SER_SPI1].sending = false;
/* Inform hw that we have served the IRQ */
AIC_EOICR = 0;
SER_STROBE_OFF;
}
#endif
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