4 * This file is part of BeRTOS.
6 * Bertos is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * As a special exception, you may use this file as part of a free software
21 * library without restriction. Specifically, if other files instantiate
22 * templates or use macros or inline functions from this file, or you compile
23 * this file and link it with other files to produce an executable, this
24 * file does not by itself cause the resulting executable to be covered by
25 * the GNU General Public License. This exception does not however
26 * invalidate any other reasons why the executable file might be covered by
27 * the GNU General Public License.
29 * Copyright 2003, 2004 Develer S.r.l. (http://www.develer.com/)
30 * Copyright 2000 Bernie Innocenti <bernie@codewiz.org>
34 * \brief ARM UART and SPI I/O driver
37 * \author Daniele Basile <asterix@develer.com>
40 #include "hw/hw_ser.h" /* Required for bus macros overrides */
41 #include <hw/hw_cpufreq.h> /* CPU_FREQ */
43 #include "cfg/cfg_ser.h"
44 #include <cfg/debug.h>
49 #include <drv/irq_cm3.h>
54 #include <drv/ser_p.h>
56 #include <struct/fifobuf.h>
59 #define SERIRQ_PRIORITY 4 ///< default priority for serial irqs.
62 * \name Overridable serial bus hooks
64 * These can be redefined in hw.h to implement
65 * special bus policies such as half-duplex, 485, etc.
69 * TXBEGIN TXCHAR TXEND TXOFF
70 * | __________|__________ | |
73 * ______ __ __ __ __ __ __ ________________
74 * \/ \/ \/ \/ \/ \/ \/
75 * ______/\__/\__/\__/\__/\__/\__/
82 #ifndef SER_UART0_BUS_TXINIT
84 * Default TXINIT macro - invoked in uart0_init()
86 * - Disable GPIO on USART0 tx/rx pins
88 #if CPU_ARM_AT91 && !CPU_ARM_SAM7S_LARGE && !CPU_ARM_SAM7X
89 #warning Check USART0 pins!
91 #define SER_UART0_BUS_TXINIT do { \
92 PIOA_PDR = BV(RXD0) | BV(TXD0); \
96 #ifndef SER_UART0_BUS_TXBEGIN
98 * Invoked before starting a transmission
100 #define SER_UART0_BUS_TXBEGIN
103 #ifndef SER_UART0_BUS_TXCHAR
105 * Invoked to send one character.
107 #define SER_UART0_BUS_TXCHAR(c) do { \
112 #ifndef SER_UART0_BUS_TXEND
114 * Invoked as soon as the txfifo becomes empty
116 #define SER_UART0_BUS_TXEND
119 /* End USART0 macros */
121 #if !CPU_CM3_AT91SAM3U
123 #ifndef SER_UART1_BUS_TXINIT
125 * Default TXINIT macro - invoked in uart1_init()
127 * - Disable GPIO on USART1 tx/rx pins
130 #if !CPU_ARM_SAM7S_LARGE && !CPU_ARM_SAM7X
131 #warning Check USART1 pins!
133 #define SER_UART1_BUS_TXINIT do { \
134 PIOA_PDR = BV(RXD1) | BV(TXD1); \
136 #elif CPU_CM3_AT91SAM3
137 #define SER_UART1_BUS_TXINIT do { \
138 PIOB_PDR = BV(RXD1) | BV(TXD1); \
145 #ifndef SER_UART1_BUS_TXBEGIN
147 * Invoked before starting a transmission
149 #define SER_UART1_BUS_TXBEGIN
152 #ifndef SER_UART1_BUS_TXCHAR
154 * Invoked to send one character.
156 #define SER_UART1_BUS_TXCHAR(c) do { \
161 #ifndef SER_UART1_BUS_TXEND
163 * Invoked as soon as the txfifo becomes empty
165 #define SER_UART1_BUS_TXEND
171 * \name Overridable SPI hooks
173 * These can be redefined in hw.h to implement
174 * special bus policies such as slave select pin handling, etc.
179 #ifndef SER_SPI0_BUS_TXINIT
181 * Default TXINIT macro - invoked in spi_init()
182 * The default is no action.
184 #define SER_SPI0_BUS_TXINIT do { \
185 /* Disable PIO on SPI pins */ \
186 PIOA_PDR = BV(SPI0_SPCK) | BV(SPI0_MOSI) | BV(SPI0_MISO); \
190 #ifndef SER_SPI0_BUS_TXCLOSE
192 * Invoked after the last character has been transmitted.
193 * The default is no action.
195 #define SER_SPI0_BUS_TXCLOSE do { \
196 /* Enable PIO on SPI pins */ \
197 PIOA_PER = BV(SPI0_SPCK) | BV(SPI0_MOSI) | BV(SPI0_MISO); \
203 #ifndef SER_SPI1_BUS_TXINIT
205 * Default TXINIT macro - invoked in spi_init()
206 * The default is no action.
208 #define SER_SPI1_BUS_TXINIT do { \
209 /* Disable PIO on SPI pins */ \
210 PIOA_PDR = BV(SPI1_SPCK) | BV(SPI1_MOSI) | BV(SPI1_MISO); \
211 /* SPI1 pins are on B peripheral function! */ \
212 PIOA_BSR = BV(SPI1_SPCK) | BV(SPI1_MOSI) | BV(SPI1_MISO); \
216 #ifndef SER_SPI1_BUS_TXCLOSE
218 * Invoked after the last character has been transmitted.
219 * The default is no action.
221 #define SER_SPI1_BUS_TXCLOSE do { \
222 /* Enable PIO on SPI pins */ \
223 PIOA_PER = BV(SPI1_SPCK) | BV(SPI1_MOSI) | BV(SPI1_MISO); \
231 * \name Core dependent interrupt handling macros
233 * Atmel serial hardware is used on different CPU cores,
234 * i.e. SAM3 and SAM7. The user interface of the serial
235 * subsystem is identical but core interrupt controllers
242 INLINE void sysirq_setHandler(sysirq_t irq, sysirq_handler_t handler)
244 /* Set the vector. */
245 AIC_SVR(irq) = uart0_irq_dispatcher;
247 /* Initialize to level/edge sensitive with defined priority. */
249 if (irq == SPI0_ID || irq == SPI1_ID)
253 AIC_SMR(irq) = (AIC_SMR(irq) & ~AIC_SRCTYPE_MASK) | AIC_SRCTYPE_INT_EDGE_TRIGGERED;
255 AIC_SMR(irq) = (AIC_SMR(irq) & ~AIC_SRCTYPE_MASK) | AIC_SRCTYPE_INT_LEVEL_SENSITIVE;
261 INLINE void sysirq_setPriority(sysirq_t irq, int prio)
263 AIC_SMR(irq) = (AIC_SMR(irq) & ~AIC_PRIOR_MASK) | SERIRQ_PRIORITY;
266 /** Inform hw that we have served the IRQ */
267 #define SER_INT_ACK do { \
271 #elif CPU_CM3_AT91SAM3
273 /** Inform hw that we have served the IRQ */
274 #define SER_INT_ACK do { /* nop */ } while (0)
277 #error No interrupt handling macros defined for current architecture
282 /* From the high-level serial driver */
283 extern struct Serial *ser_handles[SER_CNT];
285 /* TX and RX buffers */
286 static unsigned char uart0_txbuffer[CONFIG_UART0_TXBUFSIZE];
287 static unsigned char uart0_rxbuffer[CONFIG_UART0_RXBUFSIZE];
288 #if !CPU_CM3_AT91SAM3U
289 static unsigned char uart1_txbuffer[CONFIG_UART1_TXBUFSIZE];
290 static unsigned char uart1_rxbuffer[CONFIG_UART1_RXBUFSIZE];
292 static unsigned char spi0_txbuffer[CONFIG_SPI0_TXBUFSIZE];
293 static unsigned char spi0_rxbuffer[CONFIG_SPI0_RXBUFSIZE];
295 static unsigned char spi1_txbuffer[CONFIG_SPI1_TXBUFSIZE];
296 static unsigned char spi1_rxbuffer[CONFIG_SPI1_RXBUFSIZE];
300 * Internal hardware state structure
302 * The \a sending variable is true while the transmission
303 * interrupt is retriggering itself.
305 * For the USARTs the \a sending flag is useful for taking specific
306 * actions before sending a burst of data, at the start of a trasmission
307 * but not before every char sent.
309 * For the SPI, this flag is necessary because the SPI sends and receives
310 * bytes at the same time and the SPI IRQ is unique for send/receive.
311 * The only way to start transmission is to write data in SPDR (this
312 * is done by spi_starttx()). We do this *only* if a transfer is
313 * not already started.
317 struct SerialHardware hw;
318 volatile bool sending;
321 static ISR_PROTO(uart0_irq_dispatcher);
322 #if !CPU_CM3_AT91SAM3U
323 static ISR_PROTO(uart1_irq_dispatcher);
325 static ISR_PROTO(spi0_irq_handler);
327 static ISR_PROTO(spi1_irq_handler);
330 * Callbacks for USART0
332 static void uart0_init(
333 UNUSED_ARG(struct SerialHardware *, _hw),
334 UNUSED_ARG(struct Serial *, ser))
336 US0_IDR = 0xFFFFFFFF;
337 PMC_PCER = BV(US0_ID);
341 * - Set serial param: mode Normal, 8bit data, 1bit stop, parity none
342 * - Enable both the receiver and the transmitter
343 * - Enable only the RX complete interrupt
345 US0_CR = BV(US_RSTRX) | BV(US_RSTTX);
346 US0_MR = US_CHMODE_NORMAL | US_CHRL_8 | US_NBSTOP_1 | US_PAR_NO;
347 US0_CR = BV(US_RXEN) | BV(US_TXEN);
348 US0_IER = BV(US_RXRDY);
350 SER_UART0_BUS_TXINIT;
352 sysirq_setPriority(US0_ID, SERIRQ_PRIORITY);
353 sysirq_setHandler(US0_ID, uart0_irq_dispatcher);
358 static void uart0_cleanup(UNUSED_ARG(struct SerialHardware *, _hw))
360 US0_CR = BV(US_RSTRX) | BV(US_RSTTX) | BV(US_RXDIS) | BV(US_TXDIS) | BV(US_RSTSTA);
363 static void uart0_enabletxirq(struct SerialHardware *_hw)
365 struct ArmSerial *hw = (struct ArmSerial *)_hw;
368 * WARNING: racy code here! The tx interrupt sets hw->sending to false
369 * when it runs with an empty fifo. The order of statements in the
376 * - Enable the transmitter
377 * - Enable TX empty interrupt
379 SER_UART0_BUS_TXBEGIN;
380 US0_IER = BV(US_TXEMPTY);
384 static void uart0_setbaudrate(UNUSED_ARG(struct SerialHardware *, _hw), unsigned long rate)
386 /* Compute baud-rate period */
387 US0_BRGR = CPU_FREQ / (16 * rate);
388 //DB(kprintf("uart0_setbaudrate(rate=%lu): period=%d\n", rate, period);)
391 static void uart0_setparity(UNUSED_ARG(struct SerialHardware *, _hw), int parity)
393 US0_MR &= ~US_PAR_MASK;
394 /* Set UART parity */
397 case SER_PARITY_NONE:
403 case SER_PARITY_EVEN:
406 US0_MR |= US_PAR_EVEN;
412 US0_MR |= US_PAR_ODD;
420 * Callbacks for USART1
422 static void uart1_init(
423 UNUSED_ARG(struct SerialHardware *, _hw),
424 UNUSED_ARG(struct Serial *, ser))
426 US1_IDR = 0xFFFFFFFF;
427 PMC_PCER = BV(US1_ID);
431 * - Set serial param: mode Normal, 8bit data, 1bit stop, parity none
432 * - Enable both the receiver and the transmitter
433 * - Enable only the RX complete interrupt
435 US1_CR = BV(US_RSTRX) | BV(US_RSTTX);
436 US1_MR = US_CHMODE_NORMAL | US_CHRL_8 | US_NBSTOP_1 | US_PAR_NO;
437 US1_CR = BV(US_RXEN) | BV(US_TXEN);
438 US1_IER = BV(US_RXRDY);
440 SER_UART1_BUS_TXINIT;
442 sysirq_setPriority(US1_ID, SERIRQ_PRIORITY);
443 sysirq_setHandler(US1_ID, uart1_irq_dispatcher);
448 static void uart1_cleanup(UNUSED_ARG(struct SerialHardware *, _hw))
450 US1_CR = BV(US_RSTRX) | BV(US_RSTTX) | BV(US_RXDIS) | BV(US_TXDIS) | BV(US_RSTSTA);
453 static void uart1_enabletxirq(struct SerialHardware *_hw)
455 struct ArmSerial *hw = (struct ArmSerial *)_hw;
458 * WARNING: racy code here! The tx interrupt sets hw->sending to false
459 * when it runs with an empty fifo. The order of statements in the
466 * - Enable the transmitter
467 * - Enable TX empty interrupt
469 SER_UART1_BUS_TXBEGIN;
470 US1_IER = BV(US_TXEMPTY);
474 static void uart1_setbaudrate(UNUSED_ARG(struct SerialHardware *, _hw), unsigned long rate)
476 /* Compute baud-rate period */
477 US1_BRGR = CPU_FREQ / (16 * rate);
478 //DB(kprintf("uart0_setbaudrate(rate=%lu): period=%d\n", rate, period);)
481 static void uart1_setparity(UNUSED_ARG(struct SerialHardware *, _hw), int parity)
483 US1_MR &= ~US_PAR_MASK;
484 /* Set UART parity */
487 case SER_PARITY_NONE:
493 case SER_PARITY_EVEN:
496 US1_MR |= US_PAR_EVEN;
502 US1_MR |= US_PAR_ODD;
511 static void spi0_init(UNUSED_ARG(struct SerialHardware *, _hw), UNUSED_ARG(struct Serial *, ser))
516 SPI0_CR = BV(SPI_SWRST);
519 * Set SPI to master mode, fixed peripheral select, chip select directly connected to a peripheral device,
520 * SPI clock set to MCK, mode fault detection disabled, loopback disable, NPCS0 active, Delay between CS = 0
522 SPI0_MR = BV(SPI_MSTR) | BV(SPI_MODFDIS);
526 * At reset clock division factor is set to 0, that is
527 * *forbidden*. Set SPI clock to minimum to keep it valid.
529 SPI0_CSR0 = BV(SPI_NCPHA) | (255 << SPI_SCBR_SHIFT);
531 /* Disable all irqs */
532 SPI0_IDR = 0xFFFFFFFF;
534 sysirq_setPriority(SPI0_ID, SERIRQ_PRIORITY);
535 sysirq_setHandler(SPI0_ID, spi0_irq_handler);
536 PMC_PCER = BV(SPI0_ID);
538 /* Enable interrupt on tx buffer empty */
539 SPI0_IER = BV(SPI_TXEMPTY);
542 SPI0_CR = BV(SPI_SPIEN);
547 static void spi0_cleanup(UNUSED_ARG(struct SerialHardware *, _hw))
550 SPI0_CR = BV(SPI_SPIDIS);
552 /* Disable all irqs */
553 SPI0_IDR = 0xFFFFFFFF;
555 SER_SPI0_BUS_TXCLOSE;
558 static void spi0_starttx(struct SerialHardware *_hw)
560 struct ArmSerial *hw = (struct ArmSerial *)_hw;
563 IRQ_SAVE_DISABLE(flags);
565 /* Send data only if the SPI is not already transmitting */
566 if (!hw->sending && !fifo_isempty(&ser_handles[SER_SPI0]->txfifo))
569 SPI0_TDR = fifo_pop(&ser_handles[SER_SPI0]->txfifo);
575 static void spi0_setbaudrate(UNUSED_ARG(struct SerialHardware *, _hw), unsigned long rate)
577 SPI0_CSR0 &= ~SPI_SCBR;
579 ASSERT((uint8_t)DIV_ROUND(CPU_FREQ, rate));
580 SPI0_CSR0 |= DIV_ROUND(CPU_FREQ, rate) << SPI_SCBR_SHIFT;
585 static void spi1_init(UNUSED_ARG(struct SerialHardware *, _hw), UNUSED_ARG(struct Serial *, ser))
590 SPI1_CR = BV(SPI_SWRST);
593 * Set SPI to master mode, fixed peripheral select, chip select directly connected to a peripheral device,
594 * SPI clock set to MCK, mode fault detection disabled, loopback disable, NPCS0 active, Delay between CS = 0
596 SPI1_MR = BV(SPI_MSTR) | BV(SPI_MODFDIS);
600 * At reset clock division factor is set to 0, that is
601 * *forbidden*. Set SPI clock to minimum to keep it valid.
603 SPI1_CSR0 = BV(SPI_NCPHA) | (255 << SPI_SCBR_SHIFT);
605 /* Disable all SPI irqs */
606 SPI1_IDR = 0xFFFFFFFF;
608 sysirq_setPriority(SPI1_ID, SERIRQ_PRIORITY);
609 sysirq_setHandler(SPI1_ID, spi1_irq_dispatcher);
610 PMC_PCER = BV(SPI1_ID);
612 /* Enable interrupt on tx buffer empty */
613 SPI1_IER = BV(SPI_TXEMPTY);
616 SPI1_CR = BV(SPI_SPIEN);
621 static void spi1_cleanup(UNUSED_ARG(struct SerialHardware *, _hw))
624 SPI1_CR = BV(SPI_SPIDIS);
626 /* Disable all irqs */
627 SPI1_IDR = 0xFFFFFFFF;
629 SER_SPI1_BUS_TXCLOSE;
632 static void spi1_starttx(struct SerialHardware *_hw)
634 struct ArmSerial *hw = (struct ArmSerial *)_hw;
637 IRQ_SAVE_DISABLE(flags);
639 /* Send data only if the SPI is not already transmitting */
640 if (!hw->sending && !fifo_isempty(&ser_handles[SER_SPI1]->txfifo))
643 SPI1_TDR = fifo_pop(&ser_handles[SER_SPI1]->txfifo);
649 static void spi1_setbaudrate(UNUSED_ARG(struct SerialHardware *, _hw), unsigned long rate)
651 SPI1_CSR0 &= ~SPI_SCBR;
653 ASSERT((uint8_t)DIV_ROUND(CPU_FREQ, rate));
654 SPI1_CSR0 |= DIV_ROUND(CPU_FREQ, rate) << SPI_SCBR_SHIFT;
658 static void spi_setparity(UNUSED_ARG(struct SerialHardware *, _hw), UNUSED_ARG(int, parity))
664 static bool tx_sending(struct SerialHardware* _hw)
666 struct ArmSerial *hw = (struct ArmSerial *)_hw;
670 // FIXME: move into compiler.h? Ditch?
672 #define C99INIT(name,val) .name = val
673 #elif defined(__GNUC__)
674 #define C99INIT(name,val) name: val
676 #warning No designated initializers, double check your code
677 #define C99INIT(name,val) (val)
681 * High-level interface data structures
683 static const struct SerialHardwareVT UART0_VT =
685 C99INIT(init, uart0_init),
686 C99INIT(cleanup, uart0_cleanup),
687 C99INIT(setBaudrate, uart0_setbaudrate),
688 C99INIT(setParity, uart0_setparity),
689 C99INIT(txStart, uart0_enabletxirq),
690 C99INIT(txSending, tx_sending),
693 static const struct SerialHardwareVT UART1_VT =
695 C99INIT(init, uart1_init),
696 C99INIT(cleanup, uart1_cleanup),
697 C99INIT(setBaudrate, uart1_setbaudrate),
698 C99INIT(setParity, uart1_setparity),
699 C99INIT(txStart, uart1_enabletxirq),
700 C99INIT(txSending, tx_sending),
703 static const struct SerialHardwareVT SPI0_VT =
705 C99INIT(init, spi0_init),
706 C99INIT(cleanup, spi0_cleanup),
707 C99INIT(setBaudrate, spi0_setbaudrate),
708 C99INIT(setParity, spi_setparity),
709 C99INIT(txStart, spi0_starttx),
710 C99INIT(txSending, tx_sending),
713 static const struct SerialHardwareVT SPI1_VT =
715 C99INIT(init, spi1_init),
716 C99INIT(cleanup, spi1_cleanup),
717 C99INIT(setBaudrate, spi1_setbaudrate),
718 C99INIT(setParity, spi_setparity),
719 C99INIT(txStart, spi1_starttx),
720 C99INIT(txSending, tx_sending),
724 static struct ArmSerial UARTDescs[SER_CNT] =
728 C99INIT(table, &UART0_VT),
729 C99INIT(txbuffer, uart0_txbuffer),
730 C99INIT(rxbuffer, uart0_rxbuffer),
731 C99INIT(txbuffer_size, sizeof(uart0_txbuffer)),
732 C99INIT(rxbuffer_size, sizeof(uart0_rxbuffer)),
734 C99INIT(sending, false),
738 C99INIT(table, &UART1_VT),
739 C99INIT(txbuffer, uart1_txbuffer),
740 C99INIT(rxbuffer, uart1_rxbuffer),
741 C99INIT(txbuffer_size, sizeof(uart1_txbuffer)),
742 C99INIT(rxbuffer_size, sizeof(uart1_rxbuffer)),
744 C99INIT(sending, false),
749 C99INIT(table, &SPI0_VT),
750 C99INIT(txbuffer, spi0_txbuffer),
751 C99INIT(rxbuffer, spi0_rxbuffer),
752 C99INIT(txbuffer_size, sizeof(spi0_txbuffer)),
753 C99INIT(rxbuffer_size, sizeof(spi0_rxbuffer)),
755 C99INIT(sending, false),
760 C99INIT(table, &SPI1_VT),
761 C99INIT(txbuffer, spi1_txbuffer),
762 C99INIT(rxbuffer, spi1_rxbuffer),
763 C99INIT(txbuffer_size, sizeof(spi1_txbuffer)),
764 C99INIT(rxbuffer_size, sizeof(spi1_rxbuffer)),
766 C99INIT(sending, false),
772 struct SerialHardware *ser_hw_getdesc(int unit)
774 ASSERT(unit < SER_CNT);
775 return &UARTDescs[unit].hw;
779 * Serial 0 TX interrupt handler
781 INLINE void uart0_irq_tx(void)
785 struct FIFOBuffer * const txfifo = &ser_handles[SER_UART0]->txfifo;
787 if (fifo_isempty(txfifo))
790 * - Disable the TX empty interrupts
792 US0_IDR = BV(US_TXEMPTY);
794 UARTDescs[SER_UART0].sending = false;
798 char c = fifo_pop(txfifo);
799 SER_UART0_BUS_TXCHAR(c);
806 * Serial 0 RX complete interrupt handler.
808 INLINE void uart0_irq_rx(void)
812 /* Should be read before US_CRS */
813 ser_handles[SER_UART0]->status |= US0_CSR & (SERRF_RXSROVERRUN | SERRF_FRAMEERROR);
814 US0_CR = BV(US_RSTSTA);
817 struct FIFOBuffer * const rxfifo = &ser_handles[SER_UART0]->rxfifo;
819 if (fifo_isfull(rxfifo))
820 ser_handles[SER_UART0]->status |= SERRF_RXFIFOOVERRUN;
822 fifo_push(rxfifo, c);
828 * Serial IRQ dispatcher for USART0.
830 static DECLARE_ISR(uart0_irq_dispatcher)
832 if (US0_CSR & BV(US_RXRDY))
835 if (US0_CSR & BV(US_TXEMPTY))
842 * Serial 1 TX interrupt handler
844 INLINE void uart1_irq_tx(void)
848 struct FIFOBuffer * const txfifo = &ser_handles[SER_UART1]->txfifo;
850 if (fifo_isempty(txfifo))
853 * - Disable the TX empty interrupts
855 US1_IDR = BV(US_TXEMPTY);
857 UARTDescs[SER_UART1].sending = false;
861 char c = fifo_pop(txfifo);
862 SER_UART1_BUS_TXCHAR(c);
869 * Serial 1 RX complete interrupt handler.
871 INLINE void uart1_irq_rx(void)
875 /* Should be read before US_CRS */
876 ser_handles[SER_UART1]->status |= US1_CSR & (SERRF_RXSROVERRUN | SERRF_FRAMEERROR);
877 US1_CR = BV(US_RSTSTA);
880 struct FIFOBuffer * const rxfifo = &ser_handles[SER_UART1]->rxfifo;
882 if (fifo_isfull(rxfifo))
883 ser_handles[SER_UART1]->status |= SERRF_RXFIFOOVERRUN;
885 fifo_push(rxfifo, c);
891 * Serial IRQ dispatcher for USART1.
893 static DECLARE_ISR(uart1_irq_dispatcher)
895 if (US1_CSR & BV(US_RXRDY))
898 if (US1_CSR & BV(US_TXEMPTY))
905 * SPI0 interrupt handler
907 static DECLARE_ISR(spi0_irq_handler)
912 /* Read incoming byte. */
913 if (!fifo_isfull(&ser_handles[SER_SPI0]->rxfifo))
914 fifo_push(&ser_handles[SER_SPI0]->rxfifo, c);
918 ser_handles[SER_SPI0]->status |= SERRF_RXFIFOOVERRUN;
922 if (!fifo_isempty(&ser_handles[SER_SPI0]->txfifo))
923 SPI0_TDR = fifo_pop(&ser_handles[SER_SPI0]->txfifo);
925 UARTDescs[SER_SPI0].sending = false;
935 * SPI1 interrupt handler
937 static DECLARE_ISR(spi1_irq_handler)
942 /* Read incoming byte. */
943 if (!fifo_isfull(&ser_handles[SER_SPI1]->rxfifo))
944 fifo_push(&ser_handles[SER_SPI1]->rxfifo, c);
948 ser_handles[SER_SPI1]->status |= SERRF_RXFIFOOVERRUN;
952 if (!fifo_isempty(&ser_handles[SER_SPI1]->txfifo))
953 SPI1_TDR = fifo_pop(&ser_handles[SER_SPI1]->txfifo);
955 UARTDescs[SER_SPI1].sending = false;