summaryrefslogtreecommitdiff
path: root/recipes-bsp
diff options
context:
space:
mode:
Diffstat (limited to 'recipes-bsp')
-rw-r--r--recipes-bsp/esp32spid/esp32spid_0.1.bb23
-rw-r--r--recipes-bsp/esp32spid/src/LICENSE339
-rw-r--r--recipes-bsp/esp32spid/src/Makefile15
-rw-r--r--recipes-bsp/esp32spid/src/msgq.c42
-rw-r--r--recipes-bsp/esp32spid/src/msgq.h19
-rw-r--r--recipes-bsp/esp32spid/src/spi.c284
-rw-r--r--recipes-bsp/esp32spid/src/spi.h24
-rw-r--r--recipes-bsp/esp32spid/src/tun.c94
-rw-r--r--recipes-bsp/esp32spid/src/tun.h8
9 files changed, 848 insertions, 0 deletions
diff --git a/recipes-bsp/esp32spid/esp32spid_0.1.bb b/recipes-bsp/esp32spid/esp32spid_0.1.bb
new file mode 100644
index 0000000..6a580a0
--- /dev/null
+++ b/recipes-bsp/esp32spid/esp32spid_0.1.bb
@@ -0,0 +1,23 @@
+DESCRIPTION = "esp32 spi daemon"
+SECTION = "base"
+LICENSE = "GPLv2"
+LIC_FILES_CHKSUM =
+ file://${WORKDIR}/src/LICENSE;md5=b234ee4d69f5fce4486a80fdaf4a4263"
+PR = "r0"
+
+SRC_URI = " \
+ file://src/ \
+"
+
+do_compile () {
+ cd ${WORKDIR}/src
+ ${MAKE}
+}
+
+do_install () {
+ install -d ${D}${bindir}
+ install -m 0755 ${WORKDIR}//src/esp32spid ${D}${bindir}/
+}
+
+DEPENDS = "libgpiod-dev"
+RDEPENDS_${PN} = "libgpiod" \ No newline at end of file
diff --git a/recipes-bsp/esp32spid/src/LICENSE b/recipes-bsp/esp32spid/src/LICENSE
new file mode 100644
index 0000000..d159169
--- /dev/null
+++ b/recipes-bsp/esp32spid/src/LICENSE
@@ -0,0 +1,339 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The licenses for most software are designed to take away your
+freedom to share and change it. By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users. This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it. (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.) You can apply it to
+your programs, too.
+
+ When we speak of free software, we are referring to freedom, not
+price. Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+ To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+ For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have. You must make sure that they, too, receive or can get the
+source code. And you must show them these terms so they know their
+rights.
+
+ We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+ Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software. If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+ Finally, any free program is threatened constantly by software
+patents. We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary. To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+ The precise terms and conditions for copying, distribution and
+modification follow.
+
+ GNU GENERAL PUBLIC LICENSE
+ TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+ 0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License. The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language. (Hereinafter, translation is included without limitation in
+the term "modification".) Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope. The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+ 1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+ 2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+ a) You must cause the modified files to carry prominent notices
+ stating that you changed the files and the date of any change.
+
+ b) You must cause any work that you distribute or publish, that in
+ whole or in part contains or is derived from the Program or any
+ part thereof, to be licensed as a whole at no charge to all third
+ parties under the terms of this License.
+
+ c) If the modified program normally reads commands interactively
+ when run, you must cause it, when started running for such
+ interactive use in the most ordinary way, to print or display an
+ announcement including an appropriate copyright notice and a
+ notice that there is no warranty (or else, saying that you provide
+ a warranty) and that users may redistribute the program under
+ these conditions, and telling the user how to view a copy of this
+ License. (Exception: if the Program itself is interactive but
+ does not normally print such an announcement, your work based on
+ the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole. If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works. But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+ 3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+ a) Accompany it with the complete corresponding machine-readable
+ source code, which must be distributed under the terms of Sections
+ 1 and 2 above on a medium customarily used for software interchange; or,
+
+ b) Accompany it with a written offer, valid for at least three
+ years, to give any third party, for a charge no more than your
+ cost of physically performing source distribution, a complete
+ machine-readable copy of the corresponding source code, to be
+ distributed under the terms of Sections 1 and 2 above on a medium
+ customarily used for software interchange; or,
+
+ c) Accompany it with the information you received as to the offer
+ to distribute corresponding source code. (This alternative is
+ allowed only for noncommercial distribution and only if you
+ received the program in object code or executable form with such
+ an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it. For an executable work, complete source
+code means all the source code for all modules it contains, plus any
+associated interface definition files, plus the scripts used to
+control compilation and installation of the executable. However, as a
+special exception, the source code distributed need not include
+anything that is normally distributed (in either source or binary
+form) with the major components (compiler, kernel, and so on) of the
+operating system on which the executable runs, unless that component
+itself accompanies the executable.
+
+If distribution of executable or object code is made by offering
+access to copy from a designated place, then offering equivalent
+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+ 4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License. Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+ 5. You are not required to accept this License, since you have not
+signed it. However, nothing else grants you permission to modify or
+distribute the Program or its derivative works. These actions are
+prohibited by law if you do not accept this License. Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+ 6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions. You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+ 7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License. If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all. For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices. Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+ 8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded. In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+ 9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time. Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation. If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+ 10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission. For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this. Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+ NO WARRANTY
+
+ 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+ 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+ Gnomovision version 69, Copyright (C) year name of author
+ Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary. Here is a sample; alter the names:
+
+ Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+ `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+ <signature of Ty Coon>, 1 April 1989
+ Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs. If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
diff --git a/recipes-bsp/esp32spid/src/Makefile b/recipes-bsp/esp32spid/src/Makefile
new file mode 100644
index 0000000..fcecbd5
--- /dev/null
+++ b/recipes-bsp/esp32spid/src/Makefile
@@ -0,0 +1,15 @@
+#CFLAGS =
+LDFLAGS = -pthread -lgpiod
+TARGET = esp32spid
+obj = msgq.o spi.o tun.o
+
+all: $(TARGET)
+
+%.o: %.c %.h
+ $(CC) $(CFLAGS) -c $<
+
+$(TARGET): $(obj)
+ $(CC) $(obj) $(LDFLAGS) -o $@
+
+clean:
+ rm -f $(TARGET) *.o
diff --git a/recipes-bsp/esp32spid/src/msgq.c b/recipes-bsp/esp32spid/src/msgq.c
new file mode 100644
index 0000000..ff9f59e
--- /dev/null
+++ b/recipes-bsp/esp32spid/src/msgq.c
@@ -0,0 +1,42 @@
+#include <stdlib.h>
+#include <pthread.h>
+
+#include "msgq.h"
+
+#define IDX_MASK(IDX, SIZE) ((IDX) & ((SIZE) - 1))
+
+int msgq_init(MSGQueue *msgq, unsigned char **array, uint16_t size) {
+ int rv;
+
+ msgq->idx_r = 0;
+ msgq->idx_w = 0;
+ msgq->size = size;
+ msgq->array = array;
+ rv = pthread_mutex_init(&msgq->mutex, NULL);
+ if (rv) {
+ return MSGQ_ERR;
+ }
+
+ rv = pthread_cond_init(&msgq->cond, NULL);
+ if (rv) {
+ pthread_mutex_destroy(&msgq->mutex);
+ return MSGQ_ERR;
+ }
+}
+
+int msgq_push(MSGQueue *msgq, unsigned char *buffer) {
+ if ((uint16_t)(msgq->idx_w - msgq->idx_r) == msgq->size) return MSGQ_ERR_FULL;
+
+ msgq->array[IDX_MASK(msgq->idx_w++, msgq->size)] = buffer;
+ return MSGQ_OK;
+}
+
+unsigned char *msgq_pop(MSGQueue *msgq) {
+ if (msgq->idx_r == msgq->idx_w) return NULL;
+
+ return msgq->array[IDX_MASK(msgq->idx_r++, msgq->size)];
+}
+
+uint16_t msgq_len(MSGQueue *msgq) {
+ return (uint16_t)(msgq->idx_w - msgq->idx_r);
+}
diff --git a/recipes-bsp/esp32spid/src/msgq.h b/recipes-bsp/esp32spid/src/msgq.h
new file mode 100644
index 0000000..665be32
--- /dev/null
+++ b/recipes-bsp/esp32spid/src/msgq.h
@@ -0,0 +1,19 @@
+#include <stdint.h>
+
+#define MSGQ_OK 0
+#define MSGQ_ERR -1
+#define MSGQ_ERR_FULL -10
+
+typedef struct MSGQueue {
+ uint16_t idx_r;
+ uint16_t idx_w;
+ uint16_t size;
+ unsigned char **array;
+ pthread_mutex_t mutex;
+ pthread_cond_t cond;
+} MSGQueue;
+
+int msgq_init(MSGQueue *msgq, unsigned char **array, uint16_t size);
+int msgq_push(MSGQueue *msgq, unsigned char *buffer);
+unsigned char *msgq_pop(MSGQueue *msgq);
+uint16_t msgq_len(MSGQueue *msgq);
diff --git a/recipes-bsp/esp32spid/src/spi.c b/recipes-bsp/esp32spid/src/spi.c
new file mode 100644
index 0000000..5bd0718
--- /dev/null
+++ b/recipes-bsp/esp32spid/src/spi.c
@@ -0,0 +1,284 @@
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+#include <linux/spi/spidev.h>
+
+#include <gpiod.h>
+#include <pthread.h>
+
+#include "msgq.h"
+#include "tun.h"
+#include "spi.h"
+
+static pthread_t rtscts_thd;
+static pthread_t worker_thd;
+static pthread_t handler_thd;
+static pthread_mutex_t mutex;
+
+struct gpiod_line *gpio_rts, *gpio_cts;
+static struct gpiod_line_bulk gpio_rtscts;
+
+static MSGQueue spi_bufq;
+static unsigned char *spi_bufq_array[SPI_SIZE_BUFQ];
+
+static MSGQueue spi_msgq_in;
+static unsigned char *spi_msgq_in_array[SPI_SIZE_MSGQ];
+
+static MSGQueue spi_msgq_out;
+static unsigned char *spi_msgq_out_array[SPI_SIZE_MSGQ];
+
+static uint32_t spi_speed = 5000000;
+static int spi_fd;
+
+static int _spi_xchg(unsigned char *buffer) {
+ int rv;
+ uint16_t len_tx;
+ uint16_t len_rx;
+ struct spi_ioc_transfer tr;
+
+ memset(&tr, 0, sizeof(tr));
+ tr.tx_buf = (unsigned long)buffer;
+ tr.rx_buf = (unsigned long)buffer;
+ tr.speed_hz = spi_speed,
+
+ len_tx = (uint16_t)buffer[1] << 8;
+ len_tx |= (uint16_t)buffer[2] & 0xFF;
+ if (len_tx > SPI_MTU) return SPI_ERR;
+
+ len_tx += SPI_SIZE_HDR;
+ // esp32 dma workaraund
+ if (len_tx < 8) {
+ len_tx = 8;
+ } else if (len_tx % 4 != 0) {
+ len_tx = (len_tx / 4 + 1) * 4;
+ }
+
+ tr.len = len_tx;
+
+ pthread_mutex_lock(&mutex);
+ rv = ioctl(spi_fd, SPI_IOC_MESSAGE(1), &tr);
+ if (rv < 0) return SPI_ERR_MSG;
+
+ len_rx = (uint16_t)buffer[1] << 8;
+ len_rx |= (uint16_t)buffer[2] & 0xFF;
+ if (len_rx > SPI_MTU) return SPI_ERR;
+
+ len_rx += SPI_SIZE_HDR;
+ if (len_rx > len_tx) {
+ tr.tx_buf = (unsigned long)NULL;
+ tr.rx_buf = (unsigned long)(buffer + len_tx);
+
+ len_tx = len_rx - len_tx;
+ // esp32 dma workaraund
+ if (len_tx < 8) {
+ len_tx = 8;
+ } else if (len_tx % 4 != 0) {
+ len_tx = (len_tx / 4 + 1) * 4;
+ }
+
+ tr.len = len_tx;
+
+ pthread_mutex_lock(&mutex);
+ rv = ioctl(spi_fd, SPI_IOC_MESSAGE(1), &tr);
+ if (rv < 0) return SPI_ERR_MSG;
+ }
+
+ return SPI_OK;
+}
+
+static void *spi_rtscts_handler(void *arg) {
+ MSGQueue *msgq_out = &spi_msgq_out;
+ int i, rv;
+ struct gpiod_line_bulk evt_lines;
+ struct gpiod_line_event event;
+
+ while (1) {
+ rv = gpiod_line_event_wait_bulk(&gpio_rtscts, NULL, &evt_lines);
+ if (rv < 0) continue;
+
+ for (i=0; i<gpiod_line_bulk_num_lines(&evt_lines); i++) {
+ struct gpiod_line *line;
+
+ line = gpiod_line_bulk_get_line(&evt_lines, i);
+ rv = gpiod_line_event_read(line, &event);
+ if (rv || (event.event_type != GPIOD_LINE_EVENT_RISING_EDGE)) continue;
+
+ switch (gpiod_line_offset(line)) {
+ case SPI_GPIO_RTS:
+ pthread_mutex_lock(&msgq_out->mutex);
+ pthread_cond_signal(&msgq_out->cond);
+ pthread_mutex_unlock(&msgq_out->mutex);
+ break;
+ case SPI_GPIO_CTS:
+ pthread_mutex_unlock(&mutex);
+ break;
+ }
+ }
+ }
+ return NULL;
+}
+
+static void *spi_worker(void *arg) {
+ MSGQueue *bufq = &spi_bufq;
+ MSGQueue *msgq_in = &spi_msgq_in;
+ MSGQueue *msgq_out = &spi_msgq_out;
+ int rv;
+ unsigned char *buffer;
+
+ while (1) {
+ pthread_mutex_lock(&msgq_out->mutex);
+ buffer = msgq_pop(msgq_out);
+ if ((buffer == NULL) && (gpiod_line_get_value(gpio_rts) == 1)) {
+ pthread_mutex_lock(&bufq->mutex);
+ buffer = msgq_pop(bufq);
+ pthread_mutex_unlock(&bufq->mutex);
+ }
+ if (buffer == NULL) {
+ pthread_cond_wait(&msgq_out->cond, &msgq_out->mutex);
+ buffer = msgq_pop(msgq_out);
+ }
+ pthread_mutex_unlock(&msgq_out->mutex);
+ if (buffer) {
+ rv = _spi_xchg(buffer);
+ if (rv || (buffer[0] == 0)) {
+ buffer[1] = 0;
+ buffer[2] = 0;
+ pthread_mutex_lock(&bufq->mutex);
+ rv = msgq_push(bufq, buffer);
+ pthread_mutex_unlock(&bufq->mutex);
+ } else {
+ pthread_mutex_lock(&msgq_in->mutex);
+ rv = msgq_push(msgq_in, buffer);
+ pthread_cond_signal(&msgq_in->cond);
+ pthread_mutex_unlock(&msgq_in->mutex);
+ }
+ }
+ }
+ return NULL;
+}
+
+static void *spi_handler(void *arg) {
+ MSGQueue *bufq = &spi_bufq;
+ MSGQueue *msgq_in = &spi_msgq_in;
+ unsigned char *buffer;
+ unsigned char mtype;
+ uint16_t len;
+ int rv;
+
+ while (1) {
+ pthread_mutex_lock(&msgq_in->mutex);
+ buffer = msgq_pop(msgq_in);
+ if (buffer == NULL) {
+ pthread_cond_wait(&msgq_in->cond, &msgq_in->mutex);
+ buffer = msgq_pop(msgq_in);
+ }
+ pthread_mutex_unlock(&msgq_in->mutex);
+ if (buffer) {
+ mtype = buffer[0];
+ len = (uint16_t)buffer[1] << 8;
+ len |= (uint16_t)buffer[2] & 0xFF;
+
+ switch (mtype) {
+ case SPI_MTYPE_TUN:
+ tun_write(buffer + SPI_SIZE_HDR, len);
+ break;
+ }
+ buffer[0] = 0;
+ buffer[1] = 0;
+ buffer[2] = 0;
+ pthread_mutex_lock(&bufq->mutex);
+ rv = msgq_push(bufq, buffer);
+ pthread_mutex_unlock(&bufq->mutex);
+ }
+ }
+}
+
+unsigned char *spi_alloc(void) {
+ MSGQueue *bufq = &spi_bufq;
+ unsigned char *ret;
+
+ pthread_mutex_lock(&bufq->mutex);
+ ret = msgq_pop(bufq);
+ pthread_mutex_unlock(&bufq->mutex);
+
+ return ret;
+}
+
+void spi_free(unsigned char *buffer) {
+ MSGQueue *bufq = &spi_bufq;
+
+ buffer[0] = 0;
+ buffer[1] = 0;
+ buffer[2] = 0;
+ pthread_mutex_lock(&bufq->mutex);
+ msgq_push(bufq, buffer);
+ pthread_mutex_unlock(&bufq->mutex);
+}
+
+int spi_xchg(unsigned char mtype, unsigned char *buffer, uint16_t len) {
+ int rv;
+ MSGQueue *msgq_out = &spi_msgq_out;
+
+ buffer[0] = mtype;
+ buffer[1] = len >> 8;
+ buffer[2] = len & 0xFF;
+
+ pthread_mutex_lock(&msgq_out->mutex);
+ rv = msgq_push(msgq_out, buffer);
+ pthread_cond_signal(&msgq_out->cond);
+ pthread_mutex_unlock(&msgq_out->mutex);
+
+ return rv;
+}
+
+int spi_init(char *fname) {
+ int rv, i;
+ struct gpiod_chip *gpio_chip;
+
+ spi_fd = open(fname, O_RDWR);
+ if (spi_fd < 0) return SPI_ERR_OPEN;
+
+ rv = ioctl(spi_fd, SPI_IOC_WR_MAX_SPEED_HZ, &spi_speed);
+ if (rv == -1) return SPI_ERR;
+
+ gpio_chip = gpiod_chip_open_by_name(SPI_GPIO_BANK);
+ if (gpio_chip == NULL) return SPI_ERR;
+
+ gpio_rts = gpiod_chip_get_line(gpio_chip, SPI_GPIO_RTS);
+ gpio_cts = gpiod_chip_get_line(gpio_chip, SPI_GPIO_CTS);
+ if ((gpio_rts == NULL) || (gpio_cts == NULL)) return SPI_ERR;
+
+ gpiod_line_bulk_init(&gpio_rtscts);
+ gpiod_line_bulk_add(&gpio_rtscts, gpio_rts);
+ gpiod_line_bulk_add(&gpio_rtscts, gpio_cts);
+ rv = gpiod_line_request_bulk_rising_edge_events(&gpio_rtscts, "rtscts");
+ if (rv) return SPI_ERR;
+
+ msgq_init(&spi_bufq, spi_bufq_array, SPI_SIZE_BUFQ);
+ msgq_init(&spi_msgq_in, spi_msgq_in_array, SPI_SIZE_MSGQ);
+ msgq_init(&spi_msgq_out, spi_msgq_out_array, SPI_SIZE_MSGQ);
+ for (i=0; i<SPI_SIZE_BUFQ; i++) {
+ msgq_push(&spi_bufq, malloc(SPI_SIZE_BUF));
+ }
+
+ rv = pthread_mutex_init(&mutex, NULL);
+ rv = pthread_create(&rtscts_thd, NULL, spi_rtscts_handler, NULL);
+ rv = pthread_create(&worker_thd, NULL, spi_worker, NULL);
+ rv = pthread_create(&handler_thd, NULL, spi_handler, NULL);
+
+ return SPI_OK;
+}
+
+int main(int argc, char *argv[]) {
+ int rv;
+
+ rv = spi_init("/dev/spidev0.0");
+ if (rv) printf("SPI INIT ERR\n");
+ rv = tun_init();
+ if (rv) printf("TUN INIT ERR\n");
+ tun_read(NULL);
+}
diff --git a/recipes-bsp/esp32spid/src/spi.h b/recipes-bsp/esp32spid/src/spi.h
new file mode 100644
index 0000000..c1a4d94
--- /dev/null
+++ b/recipes-bsp/esp32spid/src/spi.h
@@ -0,0 +1,24 @@
+#include <stdint.h>
+
+#define SPI_GPIO_BANK "gpiochip2"
+#define SPI_GPIO_CTS 3
+#define SPI_GPIO_RTS 4
+
+#define SPI_MTU 1500
+#define SPI_SIZE_BUF (SPI_MTU + 8)
+#define SPI_SIZE_HDR 3
+
+#define SPI_SIZE_BUFQ 64
+#define SPI_SIZE_MSGQ 256
+
+#define SPI_MTYPE_TUN 1
+
+#define SPI_OK 0
+#define SPI_ERR -1
+#define SPI_ERR_OPEN -10
+#define SPI_ERR_MSG -11
+
+unsigned char *spi_alloc(void);
+void spi_free(unsigned char *buffer);
+int spi_xchg(unsigned char mtype, unsigned char *buffer, uint16_t len);
+int spi_init(char *fname); \ No newline at end of file
diff --git a/recipes-bsp/esp32spid/src/tun.c b/recipes-bsp/esp32spid/src/tun.c
new file mode 100644
index 0000000..d75edc4
--- /dev/null
+++ b/recipes-bsp/esp32spid/src/tun.c
@@ -0,0 +1,94 @@
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+#include <linux/if.h>
+#include <linux/if_tun.h>
+
+#include <pthread.h>
+
+#include "spi.h"
+#include "tun.h"
+
+static pthread_t read_thd;
+
+static int tun_fd;
+static char tun_name[IFNAMSIZ];
+
+static int tun_alloc(char *dev, int flags) {
+ struct ifreq ifr;
+ int fd, err;
+ char *clonedev = "/dev/net/tun";
+
+ /* Arguments taken by the function:
+ *
+ * char *dev: the name of an interface (or '\0'). MUST have enough
+ * space to hold the interface name if '\0' is passed
+ * int flags: interface flags (eg, IFF_TUN etc.)
+ */
+
+ fd = open(clonedev, O_RDWR);
+ if (fd < 0) {
+ return fd;
+ }
+
+ memset(&ifr, 0, sizeof(ifr));
+ ifr.ifr_flags = flags; /* IFF_TUN or IFF_TAP, plus maybe IFF_NO_PI */
+
+ if (*dev) {
+ /* if a device name was specified, put it in the structure; otherwise,
+ * the kernel will try to allocate the "next" device of the
+ * specified type */
+ strncpy(ifr.ifr_name, dev, IFNAMSIZ);
+ }
+
+ /* try to create the device */
+ err = ioctl(fd, TUNSETIFF, (void *) &ifr);
+ if (err < 0) {
+ close(fd);
+ return err;
+ }
+
+ /* if the operation was successful, write back the name of the
+ * interface to the variable "dev", so the caller can know
+ * it. Note that the caller MUST reserve space in *dev (see calling
+ * code below) */
+ strcpy(dev, ifr.ifr_name);
+
+ /* this is the special file descriptor that the caller will use to talk
+ * with the virtual interface */
+ return fd;
+}
+
+void *tun_read(void *arg) {
+ unsigned char *buffer;
+ int len;
+
+ while (1) {
+ buffer = spi_alloc();
+ if (buffer == NULL) continue;
+ len = read(tun_fd, buffer + SPI_SIZE_HDR, SPI_SIZE_BUF - SPI_SIZE_HDR);
+ if (len < 0) {
+ perror("tun read");
+ continue;
+ }
+ spi_xchg(SPI_MTYPE_TUN, buffer, len);
+ }
+}
+
+int tun_write(unsigned char *buffer, uint16_t len) {
+ return write(tun_fd, buffer, len);
+}
+
+int tun_init(void) {
+ int rv;
+
+ strcpy(tun_name, "tun0");
+ tun_fd = tun_alloc(tun_name, IFF_TUN | IFF_NO_PI);
+ if (tun_fd < 0) return TUN_ERR;
+
+ return TUN_OK;
+}
diff --git a/recipes-bsp/esp32spid/src/tun.h b/recipes-bsp/esp32spid/src/tun.h
new file mode 100644
index 0000000..bcfdac5
--- /dev/null
+++ b/recipes-bsp/esp32spid/src/tun.h
@@ -0,0 +1,8 @@
+#include <stdint.h>
+
+#define TUN_OK 0
+#define TUN_ERR -1
+
+void *tun_read(void *arg);
+int tun_write(unsigned char *buffer, uint16_t len);
+int tun_init(void); \ No newline at end of file