The system tick is responsible for everything timing relevant in RTEMS.
So if you want to use functions like sleep or rtems_task_wake_after, you
need a tick. If you don't want to use anything timing relevant, you can
disable that by (I think) using
CONFIGURE_APPLICATION_DOES_NOT_NEED_CLOCK_DRIVER
But please be aware that with that nothing which needs the system to
wait for a given time would work any more.
Am 24.04.19 um 11:04 schrieb Jython:
> Thanks for your quick reply!
> the system will wake up every tick, why? does it effect the RTC wakeup?
> i am also debugging the rtc wakeup, have posted a mail
> https://lists.rtems.org/pipermail/users/2019-April/033176.html
>
> On Wed, Apr 24, 2019 at 4:48 PM Christian Mauderer
> <christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>> wrote:
>
> There is the wfi in the Idle body. So as soon as all your tasks are
> sleeping (via sleep(), rtems_task_wake_after(), waiting for some signals
> or similar functions) wfi will be called.
>
> Note that there most likely is a lot of potential in the drivers to save
> power. Also note that the system will wake up every tick. So depending
> on your configuration the power consumption will vary.
>
> Am 24.04.19 um 10:44 schrieb Jython:
> > i searched it by add -i
> >
> > 56794:0000d040 <_CPU_Thread_Idle_body>:
> > 56795-#ifdef ARM_MULTILIB_HAS_WFI
> > 56796-
> > 56797:void *_CPU_Thread_Idle_body( uintptr_t ignored )
> > 56798-{
> > 56799- while ( true ) {
> > 56800- __asm__ volatile ("wfi");
> > 56801- d040: bf30 wfi
> > 56802- }
> > 56803: d042: e7fd b.n d040 <_CPU_Thread_Idle_body>
> > 56804-
> > 56805-0000d044 <rtems_filesystem_default_close>:
> > 56806-int rtems_filesystem_default_close(
> > 56807- rtems_libio_t *iop
> > 56808-)
> > 56809-{
> > 56810- return 0;
> > 56811-}
> > 56812- d044: 2000 movs r0, #0
> > 56813- d046: 4770 bx lr
> >
> >
> > that's to say when i want to enter low power i just need to call
> sleep
> > or rtems_task_wake_after or just while(1); ?
> >
> > On Wed, Apr 24, 2019 at 4:36 PM Christian Mauderer
> > <christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>
> > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>>> wrote:
> >
> > For some reason your grep hasn't found the
> _CPU_Thread_Idle_body. It's
> > possible that the stm32f4 uses some other function for that
> also I don't
> > know why.
> >
> > For example for the xilinx_zynq_a9_qemu BSP the disassembled
> idle body
> > looks like follows:
> >
> > void *_CPU_Thread_Idle_body( uintptr_t ignored )
> > {
> > 11d70: b480 push {r7}
> > 11d72: b083 sub sp, #12
> > 11d74: af00 add r7, sp, #0
> > 11d76: 6078 str r0, [r7, #4]
> > while ( true ) {
> > #ifdef ARM_MULTILIB_HAS_WFI
> > __asm__ volatile ("wfi");
> > 11d78: bf30 wfi
> > 11d7a: e7fd b.n 11d78
> > <_CPU_Thread_Idle_body+0x8>
> >
> > Am 24.04.19 um 10:25 schrieb Jython:
> > > arm-rtems4.11-objdump -dS hello.exe | grep idle --color=auto
> -n -B
> > 5 -A 12
> > >
> > > there is no idle function which calls wfi command
> > > // log
> > > 508-
> > > 509-
> > > 510-
> > > 511- }
> > > 512-
> > > 513: if((*USART2_SR) & (1<<4)) // idle
> > > 514- 3aa: 4b13 ldr r3, [pc, #76] ; (3f8
> > > <USART2_handler+0x94>)
> > > 515- 3ac: 681b ldr r3, [r3, #0]
> > > 516- 3ae: 681b ldr r3, [r3, #0]
> > > 517- 3b0: f003 0310 and.w r3, r3, #16
> > > 518- 3b4: 2b00 cmp r3, #0
> > > 519- 3b6: d00a beq.n 3ce
> <USART2_handler+0x6a>
> > > 520- {
> > > 521: //printk("idle ");
> > > 522-
> > > 523- temp = (*USART2_SR);
> > > 524- 3b8: 4b0f ldr r3, [pc, #60] ; (3f8
> > > <USART2_handler+0x94>)
> > > 525- 3ba: 681b ldr r3, [r3, #0]
> > > 526- 3bc: 681b ldr r3, [r3, #0]
> > > 527- 3be: 60fb str r3, [r7, #12]
> > > 528- temp = (*USART2_DR);
> > > 529- 3c0: 4b0f ldr r3, [pc, #60] ; (400
> > > <USART2_handler+0x9c>)
> > > 530- 3c2: 681b ldr r3, [r3, #0]
> > > 531- 3c4: 681b ldr r3, [r3, #0]
> > > 532- 3c6: 60fb str r3, [r7, #12]
> > > 533- //temp = temp;
> > > --
> > > 627-
> > > 628-
> > > 629-
> > > 630- }
> > > 631-
> > > 632: if((*USART3_SR) & (1<<4)) // idle
> > > 633- 44c: 4b12 ldr r3, [pc, #72] ; (498
> > > <USART3_handler+0x8c>)
> > > 634- 44e: 681b ldr r3, [r3, #0]
> > > 635- 450: 681b ldr r3, [r3, #0]
> > > 636- 452: f003 0310 and.w r3, r3, #16
> > > 637- 456: 2b00 cmp r3, #0
> > > 638- 458: d00a beq.n 470
> <USART3_handler+0x64>
> > > 639- {
> > > 640: //printk("idle ");
> > > 641-
> > > 642- temp = (*USART3_SR);
> > > 643- 45a: 4b0f ldr r3, [pc, #60] ; (498
> > > <USART3_handler+0x8c>)
> > > 644- 45c: 681b ldr r3, [r3, #0]
> > > 645- 45e: 681b ldr r3, [r3, #0]
> > > 646- 460: 60fb str r3, [r7, #12]
> > > 647- temp = (*USART3_DR);
> > > 648- 462: 4b0f ldr r3, [pc, #60] ; (4a0
> > > <USART3_handler+0x94>)
> > > 649- 464: 681b ldr r3, [r3, #0]
> > > 650- 466: 681b ldr r3, [r3, #0]
> > > 651- 468: 60fb str r3, [r7, #12]
> > > 652-
> > > --
> > > 26329-
> > > 26330- if (newTail == tty->rawOutBuf.Head) {
> > > 26331- /*
> > > 26332- * Buffer has become empty
> > > 26333- */
> > > 26334: tty->rawOutBufState = rob_idle;
> > > 26335- 69a0: f880 5094 strb.w r5, [r0, #148]
> ; 0x94
> > > 26336- (*tty->handler.write) (ctx, NULL, 0);
> > > 26337- 69a4: f8d4 30c4 ldr.w r3, [r4, #196]
> ; 0xc4
> > > 26338- 69a8: 4670 mov r0, lr
> > > 26339- 69aa: 4629 mov r1, r5
> > > 26340- 69ac: 462a mov r2, r5
> > > 26341- 69ae: 4798 blx r3
> > > 26342- nToSend = 0;
> > > 26343-
> > > 26344- /*
> > > 26345- * check to see if snd wakeup callback was set
> > > 26346- */
> > > --
> > > 26443- 6a12: 2600 movs r6, #0
> > > 26444- 6a14: e7ac b.n 6970
> > > <rtems_termios_refill_transmitter+0x7c>
> > > 26445- /*
> > > 26446- * Buffer has become empty
> > > 26447- */
> > > 26448: tty->rawOutBufState = rob_idle;
> > > 26449- (*tty->handler.write) (ctx, NULL, 0);
> > > 26450- nToSend = 0;
> > > 26451- 6a16: 461d mov r5, r3
> > > 26452- 6a18: e7aa b.n 6970
> > > <rtems_termios_refill_transmitter+0x7c>
> > > 26453- 6a1a: bf00 nop
> > > 26454-
> > > 26455-00006a1c <rtems_termios_txdaemon>:
> > > 26456-
> > > 26457-/*
> > > 26458- * this task actually processes any transmit events
> > > 26459- */
> > > 26460-static rtems_task
> rtems_termios_txdaemon(rtems_task_argument
> > argument)
> > > --
> > > 27083- RTEMS_NO_PRIORITY,
> > > 27084- &tty->rawOutBuf.Semaphore);
> > > 27085- if (sc != RTEMS_SUCCESSFUL)
> > > 27086- 6cc0: 2800 cmp r0, #0
> > > 27087- 6cc2: f040 80d6 bne.w 6e72
> > > <rtems_termios_open_tty+0x2de>
> > > 27088: tty->rawOutBufState = rob_idle;
> > > 27089-
> > > 27090- /*
> > > 27091- * Set callbacks
> > > 27092- */
> > > 27093- if (device_node != NULL) {
> > > 27094- 6cc6: 9b0e ldr r3, [sp, #56] ; 0x38
> > > 27095- RTEMS_SIMPLE_BINARY_SEMAPHORE | RTEMS_FIFO,
> > > 27096- RTEMS_NO_PRIORITY,
> > > 27097- &tty->rawOutBuf.Semaphore);
> > > 27098- if (sc != RTEMS_SUCCESSFUL)
> > > 27099- rtems_fatal_error_occurred (sc);
> > > 27100: tty->rawOutBufState = rob_idle;
> > > 27101- 6cc8: f884 0094 strb.w r0, [r4, #148]
> ; 0x94
> > > 27102-
> > > 27103- /*
> > > 27104- * Set callbacks
> > > 27105- */
> > > 27106- if (device_node != NULL) {
> > > 27107- 6ccc: 2b00 cmp r3, #0
> > > 27108- 6cce: f000 80e9 beq.w 6ea4
> > > <rtems_termios_open_tty+0x310>
> > > 27109- device_node->tty = tty;
> > > 27110- tty->handler = *device_node->handler;
> > > 27111- 6cd2: f104 0cb8 add.w ip, r4, #184 ; 0xb8
> > > 27112- 6cd6: 4666 mov r6, ip
> > > --
> > > 29226- /* disable interrupts */
> > > 29227- rtems_termios_device_lock_acquire (ctx,
> &lock_context);
> > > 29228- tty->flow_ctrl &= ~FL_OSTOP;
> > > 29229- 7442: f8d4 30d8 ldr.w r3, [r4, #216]
> ; 0xd8
> > > 29230- /* check for chars in output buffer (or
> rob_state?) */
> > > 29231: if (tty->rawOutBufState != rob_idle) {
> > > 29232- 7446: f894 2094 ldrb.w r2, [r4, #148]
> ; 0x94
> > > 29233-
> > > 29234- /* has output been stopped due to received XOFF? */
> > > 29235- if (tty->flow_ctrl & FL_OSTOP) {
> > > 29236- /* disable interrupts */
> > > 29237- rtems_termios_device_lock_acquire (ctx,
> &lock_context);
> > > 29238- tty->flow_ctrl &= ~FL_OSTOP;
> > > 29239- 744a: f023 0320 bic.w r3, r3, #32
> > > 29240- 744e: f8c4 30d8 str.w r3, [r4, #216]
> ; 0xd8
> > > 29241- /* check for chars in output buffer (or
> rob_state?) */
> > > 29242: if (tty->rawOutBufState != rob_idle) {
> > > 29243- 7452: 2a00 cmp r2, #0
> > > 29244- 7454: f040 80cf bne.w 75f6
> > <rtems_termios_ioctl+0x306>
> > > 29245- ARM_SWITCH_BACK
> > > 29246- : ARM_SWITCH_OUTPUT
> > > 29247- : [level] "r" (level)
> > > 29248- );
> > > 29249-#elif defined(ARM_MULTILIB_ARCH_V7M)
> > > 29250- __asm__ volatile (
> > > 29251- 7458: f387 8811 msr BASEPRI, r7
> > > 29252- /* reenable interrupts */
> > > 29253- rtems_termios_device_lock_release (ctx,
> &lock_context);
> > > 29254- }
> > > --
> > > 29492-
> > > 29493- rtems_termios_device_lock_acquire (ctx, &lock_context);
> > > 29494- tty->rawOutBuf.Tail = 0;
> > > 29495- 7572: f8c4 0084 str.w r0, [r4, #132]
> ; 0x84
> > > 29496- tty->rawOutBuf.Head = 0;
> > > 29497: tty->rawOutBufState = rob_idle;
> > > 29498- 7576: f884 0094 strb.w r0, [r4, #148]
> ; 0x94
> > > 29499- rtems_termios_device_context *ctx = tty->device_context;
> > > 29500- rtems_interrupt_lock_context lock_context;
> > > 29501-
> > > 29502- rtems_termios_device_lock_acquire (ctx, &lock_context);
> > > 29503- tty->rawOutBuf.Tail = 0;
> > > 29504- tty->rawOutBuf.Head = 0;
> > > 29505- 757a: f8c4 0080 str.w r0, [r4, #128]
> ; 0x80
> > > 29506- ARM_SWITCH_BACK
> > > 29507- : ARM_SWITCH_OUTPUT
> > > 29508- : [level] "r" (level)
> > > 29509- );
> > > --
> > > 29562-
> > > 29563- rtems_termios_device_lock_acquire (ctx, &lock_context);
> > > 29564- tty->rawOutBuf.Tail = 0;
> > > 29565- 75b0: f8c4 0084 str.w r0, [r4, #132]
> ; 0x84
> > > 29566- tty->rawOutBuf.Head = 0;
> > > 29567: tty->rawOutBufState = rob_idle;
> > > 29568- 75b4: f884 0094 strb.w r0, [r4, #148]
> ; 0x94
> > > 29569- rtems_termios_device_context *ctx = tty->device_context;
> > > 29570- rtems_interrupt_lock_context lock_context;
> > > 29571-
> > > 29572- rtems_termios_device_lock_acquire (ctx, &lock_context);
> > > 29573- tty->rawOutBuf.Tail = 0;
> > > 29574- tty->rawOutBuf.Head = 0;
> > > 29575- 75b8: f8c4 0080 str.w r0, [r4, #128]
> ; 0x80
> > > 29576- ARM_SWITCH_BACK
> > > 29577- : ARM_SWITCH_OUTPUT
> > > 29578- : [level] "r" (level)
> > > 29579- );
> > > --
> > > 29629- 75f0: 2301 movs r3, #1
> > > 29630- 75f2: 66e3 str r3, [r4, #108] ; 0x6c
> > > 29631- 75f4: e77e b.n 74f4
> > <rtems_termios_ioctl+0x204>
> > > 29632- tty->flow_ctrl &= ~FL_OSTOP;
> > > 29633- /* check for chars in output buffer (or
> rob_state?) */
> > > 29634: if (tty->rawOutBufState != rob_idle) {
> > > 29635- /* if chars available, call write function... */
> > > 29636- (*tty->handler.write)(
> > > 29637- ctx,
> &tty->rawOutBuf.theBuf[tty->rawOutBuf.Tail],1);
> > > 29638- 75f6: f8d4 2084 ldr.w r2, [r4, #132]
> ; 0x84
> > > 29639- rtems_termios_device_lock_acquire (ctx,
> &lock_context);
> > > 29640- tty->flow_ctrl &= ~FL_OSTOP;
> > > 29641- /* check for chars in output buffer (or
> rob_state?) */
> > > 29642: if (tty->rawOutBufState != rob_idle) {
> > > 29643- /* if chars available, call write function... */
> > > 29644- (*tty->handler.write)(
> > > 29645- 75fa: 6fe1 ldr r1, [r4, #124] ; 0x7c
> > > 29646- 75fc: f8d4 30c4 ldr.w r3, [r4, #196]
> ; 0xc4
> > > 29647- 7600: 4411 add r1, r2
> > > 29648- 7602: 4628 mov r0, r5
> > > 29649- 7604: 2201 movs r2, #1
> > > 29650- 7606: 4798 blx r3
> > > 29651- 7608: e726 b.n 7458
> > <rtems_termios_ioctl+0x168>
> > > 29652- 760a: bf00 nop
> > > 29653-
> > > 29654-0000760c <rtems_termios_puts>:
> > > --
> > > 29815- 76b2: bf24 itt cs
> > > 29816- 76b4: f8d4 2088 ldrcs.w r2, [r4,
> #136] ; 0x88
> > > 29817- 76b8: 1a9b subcs r3, r3, r2
> > > 29818- tty->rawOutBuf.Head = newHead;
> > > 29819-
> > > 29820: if (tty->rawOutBufState == rob_idle) {
> > > 29821- 76ba: f894 2094 ldrb.w r2, [r4, #148]
> ; 0x94
> > > 29822-
> memcpy(&tty->rawOutBuf.theBuf[tty->rawOutBuf.Head], buf,
> > nToCopy);
> > > 29823-
> > > 29824- newHead = tty->rawOutBuf.Head + nToCopy;
> > > 29825- if (newHead >= tty->rawOutBuf.Size)
> > > 29826- newHead -= tty->rawOutBuf.Size;
> > > 29827- tty->rawOutBuf.Head = newHead;
> > > 29828- 76be: f8c4 3080 str.w r3, [r4, #128]
> ; 0x80
> > > 29829-
> > > 29830: if (tty->rawOutBufState == rob_idle) {
> > > 29831- 76c2: b192 cbz r2, 76ea
> > <rtems_termios_puts+0xde>
> > > 29832- ARM_SWITCH_BACK
> > > 29833- : ARM_SWITCH_OUTPUT
> > > 29834- : [level] "r" (level)
> > > 29835- );
> > > 29836-#elif defined(ARM_MULTILIB_ARCH_V7M)
> > > 29837- __asm__ volatile (
> > > 29838- 76c4: f385 8811 msr BASEPRI, r5
> > > 29839- if (tty->handler.mode == TERMIOS_POLLED) {
> > > 29840- (*tty->handler.write)(ctx, buf, len);
> > > 29841- return;
> > > 29842- }
> > > --
> > > 29885- 76e8: e7d2 b.n 7690
> <rtems_termios_puts+0x84>
> > > 29886- if (newHead >= tty->rawOutBuf.Size)
> > > 29887- newHead -= tty->rawOutBuf.Size;
> > > 29888- tty->rawOutBuf.Head = newHead;
> > > 29889-
> > > 29890: if (tty->rawOutBufState == rob_idle) {
> > > 29891- startXmit (tty, tty->rawOutBuf.Tail, false);
> > > 29892- 76ea: f8d4 1084 ldr.w r1, [r4, #132]
> ; 0x84
> > > 29893- 76ee: 4620 mov r0, r4
> > > 29894- 76f0: f7ff f8ca bl 6888 <startXmit>
> > > 29895- 76f4: e7e6 b.n 76c4
> <rtems_termios_puts+0xb8>
> > > 29896- rtems_termios_device_context *ctx = tty->device_context;
> > > 29897- rtems_interrupt_lock_context lock_context;
> > > 29898- rtems_status_code sc;
> > > 29899-
> > > 29900- if (tty->handler.mode == TERMIOS_POLLED) {
> > > 29901- (*tty->handler.write)(ctx, buf, len);
> > > 29902- 76f6: f8d2 30c4 ldr.w r3, [r2, #196]
> ; 0xc4
> > > --
> > > 31283- while ((tty->rawInBuf.Head != tty->rawInBuf.Tail) &&
> > > 31284- 7be4: 428a cmp r2, r1
> > > 31285- 7be6: f04f 0501 mov.w r5, #1
> > > 31286- 7bea: d968 bls.n 7cbe
> > <rtems_termios_read+0x1a6>
> > > 31287- == (FL_MDXON | FL_ISNTXOF))
> > > 31288: && ((tty->rawOutBufState == rob_idle)
> > > 31289- || (tty->flow_ctrl & FL_OSTOP))) {
> > > 31290- /* XON should be sent now... */
> > > 31291- (*tty->handler.write)(
> > > 31292- tty->device_context, (void
> > > *)&(tty->termios.c_cc[VSTART]), 1);
> > > 31293- 7bec: f104 0849 add.w r8, r4, #73 ; 0x49
> > > 31294- 7bf0: e012 b.n 7c18
> > <rtems_termios_read+0x100>
> > > 31295-
> > > 31296- rtems_termios_device_lock_release (ctx,
> &lock_context);
> > > 31297-
> > > 31298- /* continue processing new character */
> > > 31299- if (tty->termios.c_lflag & ICANON) {
> > > 31300- if (siproc (c, tty))
> > > --
> > > 31401- if (((tty->flow_ctrl & (FL_MDXON | FL_ISNTXOF))
> > > 31402- 7c56: f8d4 20d8 ldr.w r2, [r4, #216]
> ; 0xd8
> > > 31403- 7c5a: 4013 ands r3, r2
> > > 31404- 7c5c: 4553 cmp r3, sl
> > > 31405- 7c5e: d01e beq.n 7c9e
> > <rtems_termios_read+0x186>
> > > 31406: && ((tty->rawOutBufState == rob_idle)
> > > 31407- || (tty->flow_ctrl & FL_OSTOP))) {
> > > 31408- /* XON should be sent now... */
> > > 31409- (*tty->handler.write)(
> > > 31410- tty->device_context, (void
> > > *)&(tty->termios.c_cc[VSTART]), 1);
> > > 31411- } else if (tty->flow_ctrl & FL_MDRTS) {
> > > 31412- 7c60: f8d4 30d8 ldr.w r3, [r4, #216]
> ; 0xd8
> > > 31413- 7c64: 05da lsls r2, r3, #23
> > > 31414- 7c66: d50b bpl.n 7c80
> > <rtems_termios_read+0x168>
> > > 31415- tty->flow_ctrl &= ~FL_IRTSOFF;
> > > 31416- 7c68: f8d4 30d8 ldr.w r3, [r4, #216]
> ; 0xd8
> > > 31417- /* activate RTS line */
> > > 31418- if (tty->flow.start_remote_tx != NULL) {
> > > --
> > > 31477- < tty->lowwater) {
> > > 31478- tty->flow_ctrl &= ~FL_IREQXOF;
> > > 31479- /* if tx stopped and XON should be sent... */
> > > 31480- if (((tty->flow_ctrl & (FL_MDXON | FL_ISNTXOF))
> > > 31481- == (FL_MDXON | FL_ISNTXOF))
> > > 31482: && ((tty->rawOutBufState == rob_idle)
> > > 31483- 7c9e: f894 3094 ldrb.w r3, [r4, #148]
> ; 0x94
> > > 31484- 7ca2: b11b cbz r3, 7cac
> > <rtems_termios_read+0x194>
> > > 31485- || (tty->flow_ctrl & FL_OSTOP))) {
> > > 31486- 7ca4: f8d4 30d8 ldr.w r3, [r4, #216]
> ; 0xd8
> > > 31487- 7ca8: 0699 lsls r1, r3, #26
> > > 31488- 7caa: d5d9 bpl.n 7c60
> > <rtems_termios_read+0x148>
> > > 31489- /* XON should be sent now... */
> > > 31490- (*tty->handler.write)(
> > > 31491- 7cac: f8d4 30c4 ldr.w r3, [r4, #196]
> ; 0xc4
> > > 31492- 7cb0: f8d4 010c ldr.w r0, [r4, #268]
> ; 0x10c
> > > 31493- 7cb4: 4641 mov r1, r8
> > > 31494- 7cb6: 2201 movs r2, #1
> > > --
> > > 32101- /* disable interrupts */
> > > 32102- rtems_termios_device_lock_acquire (ctx,
> &lock_context);
> > > 32103- tty->flow_ctrl &= ~FL_OSTOP;
> > > 32104- 7f34: f8d4 30d8 ldr.w r3, [r4, #216]
> ; 0xd8
> > > 32105- /* check for chars in output buffer (or
> rob_state?) */
> > > 32106: if (tty->rawOutBufState != rob_idle) {
> > > 32107- 7f38: f894 2094 ldrb.w r2, [r4, #148]
> ; 0x94
> > > 32108- if (flow_rcv) {
> > > 32109- /* restart output according to FL_ORCVXOF flag */
> > > 32110- if ((tty->flow_ctrl & (FL_ORCVXOF | FL_OSTOP)) ==
> > FL_OSTOP) {
> > > 32111- /* disable interrupts */
> > > 32112- rtems_termios_device_lock_acquire (ctx,
> &lock_context);
> > > 32113- tty->flow_ctrl &= ~FL_OSTOP;
> > > 32114- 7f3c: f023 0320 bic.w r3, r3, #32
> > > 32115- 7f40: f8c4 30d8 str.w r3, [r4, #216]
> ; 0xd8
> > > 32116- /* check for chars in output buffer (or
> rob_state?) */
> > > 32117: if (tty->rawOutBufState != rob_idle) {
> > > 32118- 7f44: b94a cbnz r2, 7f5a
> > > <rtems_termios_enqueue_raw_characters+0x1ca>
> > > 32119- ARM_SWITCH_BACK
> > > 32120- : ARM_SWITCH_OUTPUT
> > > 32121- : [level] "r" (level)
> > > 32122- );
> > > 32123-#elif defined(ARM_MULTILIB_ARCH_V7M)
> > > 32124- __asm__ volatile (
> > > 32125- 7f46: f386 8811 msr BASEPRI, r6
> > > 32126- 7f4a: 2601 movs r6, #1
> > > 32127- 7f4c: e760 b.n 7e10
> > > <rtems_termios_enqueue_raw_characters+0x80>
> > > 32128- if (( !tty->tty_rcvwakeup ) && (
> tty->tty_rcv.sw_pfn !=
> > > NULL )) {
> > > 32129- (*tty->tty_rcv.sw_pfn)(&tty->termios,
> > tty->tty_rcv.sw_arg);
> > > --
> > > 32136- 7f52: 9300 str r3, [sp, #0]
> > > 32137- 7f54: f38a 8811 msr BASEPRI, sl
> > > 32138- 7f58: e75a b.n 7e10
> > > <rtems_termios_enqueue_raw_characters+0x80>
> > > 32139- tty->flow_ctrl &= ~FL_OSTOP;
> > > 32140- /* check for chars in output buffer (or
> rob_state?) */
> > > 32141: if (tty->rawOutBufState != rob_idle) {
> > > 32142- /* if chars available, call write function... */
> > > 32143- (*tty->handler.write)(
> > > 32144- ctx,
> > &tty->rawOutBuf.theBuf[tty->rawOutBuf.Tail], 1);
> > > 32145- 7f5a: f8d4 2084 ldr.w r2, [r4, #132]
> ; 0x84
> > > 32146- rtems_termios_device_lock_acquire (ctx,
> &lock_context);
> > > 32147- tty->flow_ctrl &= ~FL_OSTOP;
> > > 32148- /* check for chars in output buffer (or
> rob_state?) */
> > > 32149: if (tty->rawOutBufState != rob_idle) {
> > > 32150- /* if chars available, call write function... */
> > > 32151- (*tty->handler.write)(
> > > 32152- 7f5e: 6fe1 ldr r1, [r4, #124] ; 0x7c
> > > 32153- 7f60: f8d4 30c4 ldr.w r3, [r4, #196]
> ; 0xc4
> > > 32154- 7f64: 4411 add r1, r2
> > > 32155- 7f66: 4658 mov r0, fp
> > > 32156- 7f68: 2201 movs r2, #1
> > > 32157- 7f6a: f8cd c004 str.w ip, [sp, #4]
> > > 32158- 7f6e: 4798 blx r3
> > > 32159- 7f70: f8dd c004 ldr.w ip, [sp, #4]
> > > 32160- 7f74: e7e7 b.n 7f46
> > > <rtems_termios_enqueue_raw_characters+0x1b6>
> > > 32161- + tty->rawInBuf.Size) % tty->rawInBuf.Size) >
> > > tty->highwater)) {
> > > --
> > > 32167- 7f76: 0692 lsls r2, r2, #26
> > > 32168- 7f78: d403 bmi.n 7f82
> > > <rtems_termios_enqueue_raw_characters+0x1f2>
> > > 32169- 7f7a: f894 2094 ldrb.w r2, [r4, #148]
> ; 0x94
> > > 32170- 7f7e: 2a00 cmp r2, #0
> > > 32171- 7f80: d18c bne.n 7e9c
> > > <rtems_termios_enqueue_raw_characters+0x10c>
> > > 32172: (tty->rawOutBufState == rob_idle)) {
> > > 32173- /* if tx is stopped due to XOFF or out of
> data */
> > > 32174- /* call write function
> here */
> > > 32175- tty->flow_ctrl |= FL_ISNTXOF;
> > > 32176- 7f82: f8d4 20d8 ldr.w r2, [r4, #216]
> ; 0xd8
> > > 32177- 7f86: 9301 str r3, [sp, #4]
> > > 32178- 7f88: f042 0202 orr.w r2, r2, #2
> > > 32179- 7f8c: f8c4 20d8 str.w r2, [r4, #216]
> ; 0xd8
> > > 32180- (*tty->handler.write)(ctx,
> > > 32181- 7f90: f8d4 30c4 ldr.w r3, [r4, #196]
> ; 0xc4
> > > 32182- 7f94: 4658 mov r0, fp
> > > 32183- 7f96: f104 014a add.w r1, r4, #74 ; 0x4a
> > > 32184- 7f9a: 2201 movs r2, #1
> > > --
> > > 38521- 9512: f000 f825 bl 9560
> > > <_Extension_Manager_initialization>
> > > 38522-
> > > 38523- _POSIX_API_Initialize();
> > > 38524- 9516: f000 f863 bl 95e0
> <_POSIX_API_Initialize>
> > > 38525- 951a: 7025 strb r5, [r4, #0]
> > > 38526: _Thread_Create_idle();
> > > 38527-
> > > 38528- /*
> > > 38529- * Scheduling can properly occur now as long as we
> avoid
> > > dispatching.
> > > 38530- */
> > > 38531-}
> > > 38532- 951c: e8bd 4038 ldmia.w sp!, {r3, r4,
> r5, lr}
> > > 38533- * _Thread_Executing and _Thread_Heir are not set.
> > > 38534- *
> > > 38535- * At this point all API extensions are in place.
> After the
> > > call to
> > > 38536: * _Thread_Create_idle() _Thread_Executing and
> _Thread_Heir
> > > will be set.
> > > 38537- */
> > > 38538: _Thread_Create_idle();
> > > 38539: 9520: f002 ba3a b.w b998
> <_Thread_Create_idle>
> > > 38540- 9524: 20004618 .word 0x20004618
> > > 38541- 9528: 20004640 .word 0x20004640
> > > 38542- 952c: 200041d0 .word 0x200041d0
> > > 38543- 9530: 200041e0 .word 0x200041e0
> > > 38544- 9534: 2000429c .word 0x2000429c
> > > 38545- 9538: 20004298 .word 0x20004298
> > > 38546-
> > > 38547-0000953c <rtems_initialize_before_drivers>:
> > > 38548- * Scheduling can properly occur now as long as we
> avoid
> > > dispatching.
> > > 38549- */
> > > 38550-}
> > > 38551-
> > > --
> > > 48137-)
> > > 48138-{
> > > 48139- b3c4: 4770 bx lr
> > > 48140- b3c6: bf00 nop
> > > 48141-
> > > 48142:0000b3c8 <_Scheduler_default_Start_idle>:
> > > 48143-#if defined(RTEMS_SMP)
> > > 48144- Thread_Control *needs_help;
> > > 48145-
> > > 48146- needs_help =
> > > 48147-#endif
> > > 48148- ( *scheduler->Operations.unblock )( scheduler,
> the_thread );
> > > 48149: b3c8: 4801 ldr r0, [pc, #4] ; (b3d0
> > > <_Scheduler_default_Start_idle+0x8>)
> > > 48150- b3ca: 6943 ldr r3, [r0, #20]
> > > 48151- b3cc: 4718 bx r3
> > > 48152- b3ce: bf00 nop
> > > 48153- b3d0: 0001847c .word 0x0001847c
> > > 48154-
> > > 48155-0000b3d4 <_Scheduler_default_Tick>:
> > > 48156- /*
> > > 48157- * If the thread is not preemptible or is not
> ready, then
> > > 48158- * just return.
> > > 48159- */
> > > 48160-
> > > 48161- if ( !executing->is_preemptible )
> > > --
> > > 49735- b988: 0001847c .word 0x0001847c
> > > 49736- b98c: 0001d828 .word 0x0001d828
> > > 49737- b990: 0001d814 .word 0x0001d814
> > > 49738- b994: 0001d878 .word 0x0001d878
> > > 49739-
> > > 49740:0000b998 <_Thread_Create_idle>:
> > > 49741- cpu
> > > 49742- );
> > > 49743-}
> > > 49744-
> > > 49745:void _Thread_Create_idle( void )
> > > 49746-{
> > > 49747- b998: b5f0 push {r4, r5, r6, r7, lr}
> > > 49748- return maximum_internal_threads;
> > > 49749-}
> > > 49750-
> > > 49751-RTEMS_INLINE_ROUTINE Thread_Control
> > *_Thread_Internal_allocate( void )
> > > 49752-{
> > > 49753- return (Thread_Control *)
> > > 49754: b99a: 4f17 ldr r7, [pc, #92] ; (b9f8
> > > <_Thread_Create_idle+0x60>)
> > > 49755- b99c: b089 sub sp, #36 ; 0x24
> > > 49756- b99e: 4638 mov r0, r7
> > > 49757- b9a0: f7fe ff74 bl a88c
> > <_Objects_Allocate_unprotected>
> > > 49758- _Thread_Initialize(
> > > 49759- &_Thread_Internal_information,
> > > 49760: idle,
> > > 49761- _Scheduler_Get_by_CPU( cpu ),
> > > 49762- NULL, /* allocate the stack */
> > > 49763: _Stack_Ensure_minimum(
> > > rtems_configuration_get_idle_task_stack_size() ),
> > > 49764: b9a4: 4e15 ldr r6, [pc, #84] ; (b9fc
> > > <_Thread_Create_idle+0x64>)
> > > 49765- *
> > > 49766- * @return This method returns the minimum stack size;
> > > 49767- */
> > > 49768-RTEMS_INLINE_ROUTINE uint32_t _Stack_Minimum (void)
> > > 49769-{
> > > 49770- return rtems_minimum_stack_size;
> > > 49771: b9a6: 4a16 ldr r2, [pc, #88] ; (ba00
> > > <_Thread_Create_idle+0x68>)
> > > 49772- b9a8: 6a73 ldr r3, [r6, #36] ; 0x24
> > > 49773- b9aa: 6811 ldr r1, [r2, #0]
> > > 49774- b9ac: 4605 mov r5, r0
> > > 49775- b9ae: 428b cmp r3, r1
> > > 49776- b9b0: bf38 it cc
> > > 49777- b9b2: 460b movcc r3, r1
> > > 49778- * fields not explicitly assigned were explicitly
> zeroed by
> > > 49779- * _Workspace_Initialization.
> > > 49780- */
> > > 49781: idle = _Thread_Internal_allocate();
> > > 49782-
> > > 49783- _Thread_Initialize(
> > > 49784: b9b4: 4a13 ldr r2, [pc, #76] ; (ba04
> > > <_Thread_Create_idle+0x6c>)
> > > 49785:static void _Thread_Create_idle_for_cpu(
> Per_CPU_Control *cpu )
> > > 49786-{
> > > 49787- Objects_Name name;
> > > 49788: Thread_Control *idle;
> > > 49789-
> > > 49790- name.name_u32 = _Objects_Build_name( 'I', 'D', 'L',
> 'E' );
> > > 49791: b9b6: f8df e058 ldr.w lr, [pc, #88] ;
> ba10
> > > <_Thread_Create_idle+0x78>
> > > 49792- * fields not explicitly assigned were explicitly
> zeroed by
> > > 49793- * _Workspace_Initialization.
> > > 49794- */
> > > 49795: idle = _Thread_Internal_allocate();
> > > 49796-
> > > 49797- _Thread_Initialize(
> > > 49798- b9ba: 7811 ldrb r1, [r2, #0]
> > > 49799- b9bc: 2400 movs r4, #0
> > > 49800- b9be: 2201 movs r2, #1
> > > 49801- b9c0: 9300 str r3, [sp, #0]
> > > 49802- b9c2: 9102 str r1, [sp, #8]
> > > 49803- b9c4: f8cd e01c str.w lr, [sp, #28]
> > > 49804- b9c8: 4629 mov r1, r5
> > > 49805- b9ca: 4623 mov r3, r4
> > > 49806- b9cc: 9203 str r2, [sp, #12]
> > > 49807- b9ce: 4638 mov r0, r7
> > > 49808- b9d0: 9401 str r4, [sp, #4]
> > > 49809- b9d2: 9404 str r4, [sp, #16]
> > > 49810- b9d4: 9405 str r4, [sp, #20]
> > > 49811- b9d6: 9406 str r4, [sp, #24]
> > > 49812: b9d8: 4a0b ldr r2, [pc, #44] ; (ba08
> > > <_Thread_Create_idle+0x70>)
> > > 49813- b9da: f000 f96d bl bcb8 <_Thread_Initialize>
> > > 49814- * MUST be done before _Thread_Start is
> invoked.
> > > 49815- */
> > > 49816- cpu->heir =
> > > 49817: cpu->executing = idle;
> > > 49818-
> > > 49819- _Thread_Start(
> > > 49820- b9de: 6a32 ldr r2, [r6, #32]
> > > 49821- /*
> > > 49822- * WARNING!!! This is necessary to "kick" start the
> > system and
> > > 49823- * MUST be done before _Thread_Start is
> invoked.
> > > 49824- */
> > > 49825- cpu->heir =
> > > 49826: cpu->executing = idle;
> > > 49827: b9e0: 4e0a ldr r6, [pc, #40] ; (ba0c
> > > <_Thread_Create_idle+0x74>)
> > > 49828-
> > > 49829- _Thread_Start(
> > > 49830- b9e2: 9400 str r4, [sp, #0]
> > > 49831- b9e4: 9601 str r6, [sp, #4]
> > > 49832- b9e6: 4628 mov r0, r5
> > > 49833- b9e8: 4621 mov r1, r4
> > > 49834- b9ea: 4623 mov r3, r4
> > > 49835- /*
> > > 49836- * WARNING!!! This is necessary to "kick" start the
> > system and
> > > 49837- * MUST be done before _Thread_Start is
> invoked.
> > > 49838- */
> > > 49839- cpu->heir =
> > > 49840: cpu->executing = idle;
> > > 49841- b9ec: 60b5 str r5, [r6, #8]
> > > 49842-
> > > 49843- /*
> > > 49844- * WARNING!!! This is necessary to "kick" start the
> > system and
> > > 49845- * MUST be done before _Thread_Start is
> invoked.
> > > 49846- */
> > > 49847- cpu->heir =
> > > 49848- b9ee: 60f5 str r5, [r6, #12]
> > > 49849: cpu->executing = idle;
> > > 49850-
> > > 49851- _Thread_Start(
> > > 49852- b9f0: f000 fee0 bl c7b4 <_Thread_Start>
> > > 49853-
> > > 49854- if ( _Per_CPU_Is_processor_started( cpu ) ) {
> > > 49855: _Thread_Create_idle_for_cpu( cpu );
> > > 49856- }
> > > 49857- }
> > > 49858-}
> > > 49859- b9f4: b009 add sp, #36 ; 0x24
> > > 49860- b9f6: bdf0 pop {r4, r5, r6, r7, pc}
> > > 49861- b9f8: 200042c0 .word 0x200042c0
> > > 49862- b9fc: 000183c0 .word 0x000183c0
> > > 49863- ba00: 200011c0 .word 0x200011c0
> > > 49864- ba04: 200011bc .word 0x200011bc
> > > 49865- ba08: 0001847c .word 0x0001847c
> > > 49866- ba0c: 20004640 .word 0x20004640
> > > 49867- ba10: 49444c45 .word 0x49444c45
> > > --
> > > 54093- const Scheduler_Control *scheduler,
> > > 54094- Thread_Control *the_thread,
> > > 54095- Per_CPU_Control *cpu
> > > 54096-)
> > > 54097-{
> > > 54098: ( *scheduler->Operations.start_idle )( scheduler,
> > the_thread, cpu );
> > > 54099- c7de: 4809 ldr r0, [pc, #36] ; (c804
> > > <_Thread_Start+0x50>)
> > > 54100- _Thread_Ready( the_thread );
> > > 54101- } else {
> > > 54102- const Scheduler_Control *scheduler =
> > _Scheduler_Get_by_CPU(
> > > cpu );
> > > 54103-
> > > 54104- if ( scheduler != NULL ) {
> > > 54105- the_thread->current_state = STATES_READY;
> > > 54106- c7e0: 2200 movs r2, #0
> > > 54107- c7e2: 612a str r2, [r5, #16]
> > > 54108- c7e4: 6b43 ldr r3, [r0, #52] ; 0x34
> > > 54109- c7e6: 4629 mov r1, r5
> > > 54110- c7e8: 9a05 ldr r2, [sp, #20]
> > >
> > > On Wed, Apr 24, 2019 at 2:59 PM Christian Mauderer
> > > <christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>
> > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>>
> > > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>
> > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>>>> wrote:
> > >
> > > Am 24.04.19 um 02:35 schrieb Jython:
> > > > yes, I need to do low power for stm32f4
> > > > will this line work __asm__ volatile ("wfi");?
> > >
> > > That line should be correct. Please note that the
> instruction
> > is already
> > > used in the armv7 idle thread:
> > >
> > >
> >
>
> https://git.rtems.org/rtems/tree/cpukit/score/cpu/arm/armv7-thread-idle.c#n32
> > >
> > > The stm32f4 is a Cortex-M4 so it's quite likely that this
> > routine is
> > > used. You can check by doing an "arm-rtems5-objdump -dS" on
> > your file
> > > and search for the idle body.
> > >
> > > With kind regards
> > >
> > > Christian
> > >
> > > >
> > > >
> > > > On Tue, Apr 23, 2019 at 10:28 PM Christian Mauderer
> > > > <christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>
> > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>>
> > > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>
> > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>>>
> > > > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>
> > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>>
> > > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>
> > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>>>>> wrote:
> > > >
> > > > Am 22.04.19 um 09:47 schrieb Jython:
> > > > > HI, ALL!
> > > > > wfi
> > > >
> > >
> >
> http://www.keil.com/support/man/docs/armcc/armcc_chr1359125004400.htm
> > > > > how can i call the arm __wfi?
> > > > >
> > > > > _______________________________________________
> > > > > users mailing list
> > > > > users@rtems.org <mailto:users@rtems.org>
> <mailto:users@rtems.org <mailto:users@rtems.org>>
> > <mailto:users@rtems.org <mailto:users@rtems.org>
> <mailto:users@rtems.org <mailto:users@rtems.org>>>
> > > <mailto:users@rtems.org <mailto:users@rtems.org>
> <mailto:users@rtems.org <mailto:users@rtems.org>>
> > <mailto:users@rtems.org <mailto:users@rtems.org>
> <mailto:users@rtems.org <mailto:users@rtems.org>>>>
> > > > > http://lists.rtems.org/mailman/listinfo/users
> > > > >
> > > >
> > > > Hello Jython,
> > > >
> > > > WFI is an assembler instruction. The Keil wrapper
> isn't
> > > available in
> > > > gcc. I know of no direct replacement. Most likely
> you need a
> > > gcc inline
> > > > assembly for that.
> > > >
> > > > May I ask why you would need "wfi"? If you use a
> operating
> > > system, the
> > > > system typically handles such low level stuff for you.
> > The only
> > > > application that springs to mind for that
> instruction is
> > > overwriting the
> > > > idle loop to save energy.
> > > >
> > > > Best regards
> > > >
> > > > Christian
> > > >
> > > > --
> > > > --------------------------------------------
> > > > embedded brains GmbH
> > > > Herr Christian Mauderer
> > > > Dornierstr. 4
> > > > D-82178 Puchheim
> > > > Germany
> > > > email: christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>
> > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>>
> > > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>
> > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>>>
> > > > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>
> > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>>
> > > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>
> > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>>>>
> > > > Phone: +49-89-18 94 741 - 18
> > > > Fax: +49-89-18 94 741 - 08
> > > > PGP: Public key available on request.
> > > >
> > > > Diese Nachricht ist keine geschäftliche Mitteilung
> im Sinne
> > > des EHUG.
> > > >
> > >
> > > --
> > > --------------------------------------------
> > > embedded brains GmbH
> > > Herr Christian Mauderer
> > > Dornierstr. 4
> > > D-82178 Puchheim
> > > Germany
> > > email: christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>
> > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>>
> > > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>
> > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>>>
> > > Phone: +49-89-18 94 741 - 18
> > > Fax: +49-89-18 94 741 - 08
> > > PGP: Public key available on request.
> > >
> > > Diese Nachricht ist keine geschäftliche Mitteilung im Sinne
> > des EHUG.
> > >
> >
> > --
> > --------------------------------------------
> > embedded brains GmbH
> > Herr Christian Mauderer
> > Dornierstr. 4
> > D-82178 Puchheim
> > Germany
> > email: christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>
> > <mailto:christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>>
> > Phone: +49-89-18 94 741 - 18
> > Fax: +49-89-18 94 741 - 08
> > PGP: Public key available on request.
> >
> > Diese Nachricht ist keine geschäftliche Mitteilung im Sinne
> des EHUG.
> >
>
> --
> --------------------------------------------
> embedded brains GmbH
> Herr Christian Mauderer
> Dornierstr. 4
> D-82178 Puchheim
> Germany
> email: christian.maude...@embedded-brains.de
> <mailto:christian.maude...@embedded-brains.de>
> Phone: +49-89-18 94 741 - 18
> Fax: +49-89-18 94 741 - 08
> PGP: Public key available on request.
>
> Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
>
--
--------------------------------------------
embedded brains GmbH
Herr Christian Mauderer
Dornierstr. 4
D-82178 Puchheim
Germany
email: christian.maude...@embedded-brains.de
Phone: +49-89-18 94 741 - 18
Fax: +49-89-18 94 741 - 08
PGP: Public key available on request.
Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
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