Forum Rule: Always post complete source code & details to reproduce any issue!
Tab Content
  • manitou's Avatar
    Yesterday, 02:15 PM
    With T4 breakout, I checked the PWM waveforms on the backside pins and confirmed PWM on pins 24 and 25 have proper polarity. Also did digitalWrite tests on backside pins, and Rx-Tx tests on Serial6, Serial7, Serial8. ...
    932 replies | 19996 view(s)
  • manitou's Avatar
    Yesterday, 12:09 AM
    Thanks. you need to go deeper to find hardware timer that is being used. For example, IntervalTimer uses PIT (maybe all 4 channels), PWM uses some channels of QTIMER and flexPWM timer, IRremote uses flexPWM1 timer,...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-14-2019, 07:57 PM
    Nothing uses GPTn as far as I know ... which goes to Paul's need to have a "timers consumers list" to know what is using which timers (PIT, GPT, QTMR, flexPWM) ... IntervalTimer, Tone, PWM, IRremote ...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-14-2019, 07:49 PM
    When i want 1 us resolution micros() i paste in GPT code (have to init GPT in startup() ) but it works in a pinch. https://github.com/manitou48/teensy4/blob/master/gpt_micros.ino There are two GPT timers on T4
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-14-2019, 06:39 PM
    My one data point was that DSB was faster than polling https://forum.pjrc.com/threads/54711-Teensy-4-0-First-Beta-Test?p=194815&viewfull=1#post194815 but the reference in post #883 suggested DSB may not always work
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-14-2019, 06:20 PM
    Re: double interrupts There were earlier posts about double-interrupts. I had to spin waiting on the interrupt flag to clear. Discussion about dsb at...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-14-2019, 05:47 PM
    ACMP and DAC Here is a simple sketch to demonstrate ACMP using 6-bit DAC as reference/comparison voltage. https://github.com/manitou48/teensy4/blob/master/acmpdac.ino Sketch uses ACMP3-0 which corresponds to A4,...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-14-2019, 01:29 PM
    As I recall ping lib uses pulseIn() which in turn uses micros(). But on T4, micros() only has 10us resolution :( so I wonder how ping distance calculations are affected. (i'd really prefer systick ran at current CPU...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-14-2019, 01:04 PM
    OK, i fetched your new branch and hacked in missing def's (imrxt.h), and serialflash stuff compiled and ran. My other little SPI benchmark was OK too. thanks
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-13-2019, 08:56 PM
    No. I never tried anything like that. My comments about the Arduino tool chain was merely to use the GNU g++ in my Arduino/teensyduino folders to compile EVKB program exported from the mbed on-line compiler. So I was...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-13-2019, 05:12 PM
    Kurt, I was running with your new SPI stuff with missing defintions pasted in, and it was working with my simple SPI sketch. But I just tried to build SerialFlash listfiles example and I get SPI compile errors. ...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-13-2019, 04:01 PM
    Sounds like we need an ISR latency study for the T4 .... ISRs in the NXP SDK often had memory barrier (dsb) at end of ISR. On many of my T4 peripheral ISR's i had to spin to wait for ISR register to clear or I would...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-13-2019, 03:12 PM
    As a sanity check, maybe print LPSPI4_CCR to see what divisor really is? what value does ILI9341 lib use to set SPI CLK frequency?
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-13-2019, 02:43 PM
    added it to post #835
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-13-2019, 02:29 PM
    see SPI DMA hack in post #717 https://forum.pjrc.com/threads/54711-Teensy-4-0-First-Beta-Test?p=195192&viewfull=1#post195192 also mentioned above in #826
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-13-2019, 02:24 PM
    ooops, i didn't notice the volatile. but i did notice base count didn't change with dummy in printf, BUT why did 2nd loop slow with dummy in printf ?? Load: 18.718 base 650006.000000 799692 537001948 ...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-13-2019, 01:58 PM
    Interesting. How does behavior change with compiler optimizations? Presumably the effect on T3.6 would be about the same on T4. Also, if you print value of dummy in your printf, you may see numbers change. compiler...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-13-2019, 01:41 PM
    Did you use the latest SPI lib with Kurt's FIFO mods. Unless imrxt.h has been updated, you'll need to hack a bit to get Kurt's SPI definitions. I think others have been working on the "optimized" ILI9341. How do your...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-13-2019, 12:25 PM
    OK, I fetched latest SPI lib with Kurt's update (but imrxt.h does not have his additions yet, so some hacking required) but here is summary of SPI performance with FIFO (1000-byte transfer MISO jumpered to MOSI) ...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-13-2019, 12:33 AM
    SPI.cpp work to do: I ran SPI test with SerialFlash on T3.4 and T4. Despite T4 clock running at 37 mhz and T3.2 only at 30 mhz, the T3.2 did faster page reads than T4 (83 us vs 129us). T3 SPI lib is optimized to...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-12-2019, 05:37 PM
    You should be able to run SPI at 37.5 mhz (ask for 40 mhz in spisettings). Paul made the choice of 528000000/7. It could be a smaller divider. On the EVKB SDK tests we were using 528000000/5, max SPI clock of 52.8...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-12-2019, 04:49 PM
    Excellent! I was looking at doing that this morning. But you have left too much to the imagination ... can you post/github your demo code?
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-12-2019, 04:35 PM
    This vtable error is some sort of C++ thingee above my old C skills. Here is the simplest program that gets compile errors on T4, works on T3.2. (I believe i have copied in stream.cpp and WString.cpp into my T4 core...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-12-2019, 04:11 PM
    The discrete SPI dividers for 75 mhz are 2,3,4,5 .... which gives SPI CLK of 37.5, 25, 18.75 ... the setClockFreq algorithm picks the divider less than or equal to user-requested frequency
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-12-2019, 04:06 PM
    Yes, I provided setClockFreq snippet (post #454). If you look at the ref manual, the CCR DIV is treated as +2, so if DIV is 0, peripheral clock is divided by 2. If DIV is 1, clock is divided by 3 ... So if you want...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-12-2019, 03:00 AM
    data sheet says max SPI is 10mhz EVK CCR settings for 8mhz 0x696968xx (xx EVK SPI peripheral clock frequency differs from T4) 08 for T4
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-12-2019, 01:14 AM
    Another possible approach would be to compare T3.2 scope of SPI CLK talking to the BME820 to the scope of T4 SPI CLK and see if you can notice gaps or delays that are controlled by CCR. Yes, Paul added code for...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-11-2019, 11:36 PM
    Try setting the SPI clock to 4 mhz or 8mhz in the BME280 lib. The T4 SPI lib at this time does not set any of the timing delays for the various SPI pins (CCR reg). That may be more critical at slow speeds. The EVK...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-11-2019, 08:08 PM
    Thanks, I used your avr_emulation.h file to get my SPI OLED (adafruit SSD1306) to run the 128x32 example on T4. SPI clock request is 8mhz, scope shows 7.57 mhz as expected. Hacked CCR to increase SPI speed. Display...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-11-2019, 12:59 PM
    Maybe Ethernet? I just tried to compile Ethernet udpntp example, i get compile errors, undefined reference to `vtable for IPAddress', but I have other domestic chores in the next few hours ...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-11-2019, 12:02 PM
    I've been running Paul's T4 SPI lib and have had no trouble manually controlling CS with digitalWrite() ??? Successfully talked to SPI Serial flash on prop shield, and watched with scope.
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-11-2019, 11:34 AM
    Ethernet MAC address I'm guessin (since it matches up with Teensy 3 ether mac addresses) this is unique T4 mac address Serial.printf("%04X%08X\n",HW_OCOTP_MAC1,HW_OCOTP_MAC0); 04E9E50186BB my first beta T4 was...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-10-2019, 11:26 PM
    SPI DMA My first cut at simple SPI DMA on T4, transmit only. Checked SPI clocks on scope. Data rate is close to SPI CCR clock rate. https://github.com/manitou48/teensy4/blob/master/spidma.ino SPI CLOCK...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-10-2019, 09:08 PM
    FYI, new T4 beta arrives (#27) to swap out with my impaired unit. New beta unit uploads properly. ;) Only differences I expect are MAC address in fuses and drift in crystals crystal drift (ppm) 24MHz...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-10-2019, 06:15 PM
    OK I commented out DMAMEM on the buffer and the sketch worked. github updated 2526 ticks A0 = 11 that's 646656 ADCs/second (res 10, average 1)
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-10-2019, 06:02 PM
    Briefly WEIRD As noted, my T4 requires pressing program button after every upload. In testing my ADC-DMA sketch at one point I recompiled with A0 still jumpered to GND, and the upload worked several times without...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-10-2019, 02:15 PM
    I have dma.begin(true); so sketch doesn't hang for me. I can't get the "9" number to change if I jumper A0 to GND or 3v3 ???
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-10-2019, 01:05 PM
    ADC DMA I tried porting T3 adc-dma example to T4. It's not working. DMA isr is not firing ... what did I miss? https://github.com/manitou48/teensy4/blob/master/adcdma.ino ... thanks Anyone have an example of...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-09-2019, 10:11 PM
    Thanks. I modified teensy4b.build.flags.ld in boards.txt and T4 can get build localtime extern void *__rtc_localtime; // Arduino build process sets this void setup() { // put your setup code here, to run once: ...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-09-2019, 09:30 PM
    __rtc_localtime How/where is __rtc_localtime created? we could move the logic into the T4 build for setting RTC
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-09-2019, 05:15 PM
    RTC ticking Here is a simple sketch to start up the RTC clocked by the 32khz crystal. Starts up LPSRTC. Needs a few symbols to be added to imrxt.h https://github.com/manitou48/teensy4/blob/master/rtc.ino Other...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-09-2019, 11:21 AM
    I only modified MHz with Set_Arm_Clock() in startup.c for coremark timings at different mhz. (I'm wondering if my latest problem on my desktop (32-bit linux) might be related to exhausting some USB table. I need to...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-09-2019, 01:58 AM
    Thanks. Those numbers look good, suggesting MCU consumes 59 ma. Spec says 0.11ma/MHz, so for 600MHz about 66ma
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-09-2019, 12:15 AM
    Frank can you email me your code? Usually, with scary sketch, i add an INPUT_PULLUP pin that I spin on at the start of the sketch, and won't "start" til the pin is pulled low. Actually, what i'm interested in is the...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-08-2019, 11:59 PM
    TRNG T4 has a hardware random number generator, it is quite complex and slow, and documentation is subject to NDA. See earlier post...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-08-2019, 10:58 PM
    Well, i hooked T4 up to my laptop (linux 1.8.8 beta5), and it was able to upload and run . (I still have to push program button after load to get it to run and /dev/ttyACM0 to appear)... maybe it's something to do with...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-08-2019, 08:34 PM
    you can check the data sheet, but I think the DAC can only source about 1 ma.
    2 replies | 54 view(s)
  • manitou's Avatar
    01-08-2019, 01:32 PM
    yep, tried that and more ... no luck.
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-08-2019, 11:55 AM
    :( Sigh, T4 won't load at all this morning. After pushing program button, i get slow flashing red LED, but no progress bar and uploads fail. no /dev/ttyAMC0. Holding down program button for 13 secs, gets steady red...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-08-2019, 10:55 AM
    You can actually set the TCR frame size to 32-bits. I hacked the TCR for Paul's current T4 SPI, and the data rate increases. Otherwise the inter-frame gap dominates for 8-bit transfers. If byte-order is an issue...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-08-2019, 02:19 AM
    Sure, I could do more pin tests.
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-07-2019, 08:05 PM
    Unlimited words ;) there was also a crude text-to-speech lib (TTS), which was ported to T3 DACs from PWM. https://forum.pjrc.com/threads/44587-TTS-(Text-to-Speech)-Library-Port
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-07-2019, 03:49 PM
    beta7 quick tests: -did a few loop back tests on Serial1, Serial3 ... but what is the mapping from Serialx to UARTn (or pin numbers)?? Add to post #3 -I have one float benchmark (lat-lon to UTM) that has a few...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-07-2019, 01:00 PM
    Ah, most likely. there is random() in libc.
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-07-2019, 12:11 PM
    finding random() I need another set of eyes to solve what should be a simple mystery. I dutifully copied WMath.cpp into T4 core to get random() to work, giving same numbers as on Teensy 3. I just recently wanted to...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-07-2019, 11:47 AM
    DSB in IRQ handler: Just a follow up on use of DSB. In several of my T4 ISR handlers where I clear the interrupt flag, I would get double interrupts (as noted by tick++ in ISR), so for correct behavior, I would either...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-07-2019, 11:13 AM
    PDB equivalent? The Teensy 3 PDB timer was real handy for clocking peripherals (ADC, DAC, ...). Is there a timer or other mechanism on T4 for doing what PDB did?
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-06-2019, 10:20 PM
    Frank, do you have small example that you can share that demonstrates SPI DMA for T4? thanks
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-06-2019, 06:30 PM
    Just for the record, I tested all the T4 PWM edge pins with analogWrite(pin,64) and confirmed that all have proper 25% high duty, except pins 0 and 1, where waveform is inverted. I suspect pins 24 and 25 on the...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-06-2019, 01:32 PM
    I too did an T4 ADC (12-bit) test with DAC output from a T3.2. I also jumper the DAC output to an INPUT pin on the T4, so I can observe the voltage at which digitalRead goes from 0 to 1 and from 1 to 0 ... just...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-06-2019, 01:26 PM
    but you now have the case: mode = 0; hence the need for "|" .... yes?
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-06-2019, 01:23 PM
    Yes, button press is required on 2 32-bit linux boxes, one 64-bit linux box, and mac os (i don't use windows much, so i haven't updated its IDE). I don't think my T4 required button press at first, but i don't...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-06-2019, 12:30 PM
    another "or" fix ADC1_CFG |= mode;
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-06-2019, 12:06 PM
    actually it should read if(num >= 4) ADC1_GC |= ADC_GC_AVGE;// turns on averaging need to "or" in value, in case other bits are set
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-06-2019, 12:03 PM
    shouldn't it be if (num >= 4)
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-06-2019, 10:19 AM
    Sorry, I just looked at this and analog.c in github T4 core. It looks to me like it's missing support for disabling averaging, analogReadAveraging(1); (or 0), where you would clear bit 5 in ADCx_GC
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-05-2019, 09:53 PM
    i think that's OK, 728/1024 is about same as 2900/4096. You could also do simple loop() with analogRead(), and jumper your ADC pin to GND or 3v3. On T3*, I would jumper DAC pin to ADC and do sanity checks. I miss...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-05-2019, 09:40 PM
    FWIW, the NXP SDK EVKB examples usually used non-cacheable memory for DMA buffers, and many examples used SCB_DisableDCache() to disable DCache __STATIC_INLINE void SCB_DisableDCache (void) { #if defined...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-05-2019, 05:07 PM
    if you kept the MAC address the same when flipping between fixed IP and DHCP, then you may have ARP problems at other hosts/routers, because they have ARP address indexed by the MAC address. Try using different MAC...
    2 replies | 71 view(s)
  • manitou's Avatar
    01-05-2019, 04:27 PM
    There were posts on the EVKB eval board thread discussing high speed LPSPI, see https://forum.pjrc.com/threads/54265-Teensy-4-testing-mbed-NXP-MXRT1050-EVKB-(600-Mhz-M7)?p=191905&viewfull=1#post191905 and post #116...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-05-2019, 04:07 PM
    Re: analogWrite() anomalies In my testing pin 0 and pin 1 PWM are inverted??? There is a polarity bit in OCTRL, but that is zero'd, so it should be OK. So as a hack, I reversed polarity for pins 0 and 1 in...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-05-2019, 01:21 PM
    Maybe, I can't speak to signal quality. in hardware/teensy/avr/libraries/SPI/SPI.cpp the LPSPI clock is configured with CCM_CBCMR = (CCM_CBCMR & ~(CCM_CBCMR_LPSPI_PODF_MASK | CCM_CBCMR_LPSPI_CLK_SEL_MASK)) |...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-05-2019, 12:43 PM
    I see the same thing on my scope?? very strange .... yes, there are two PWM timers used on T4 (flexpwm and quadtimer), see pin table in post #3. flexpwm runs at 4.46 khz, qtmr at 3.62 khz
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-05-2019, 12:32 PM
    latest hack, add code to SPI.h to set SPI clock from SPISettings. SPI mode and bit order are still static at 0, and the deprecated clock setting functions have not been modified. Max SPI clock will be 37 MHz, but the...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-05-2019, 11:31 AM
    Are you happy with analogWrite now? I have seen sometimes on my scope, where the text reports the Duty cycle inverted, but the waveform is true to the duty specified in analogWrite(). If you have a screenshot of...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-05-2019, 12:42 AM
    I copied the 2 files into my beta6. On T3.2, I compiled and ran the IRsendDemo example and scope on pin 5 showed properly modulated 42 khz carrier with Sony code 0xa90. On Teensy 4, i get compile errors...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-04-2019, 09:54 PM
    beta SPI lib is hardwired to 12.5 mbs, no code yet for configuring clock rate, BUT you can manually override by setting divider (DIV) in LPSPI4_CCR, see...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-04-2019, 05:03 PM
    Take a close look at the reference manual and the imxrt.h file manual says TEMPSENSE2 is at 400D_8290 (or 400D_8000h base + 290h offset), but .h file says #define TEMPMON_TEMPSENSE2 (IMXRT_TEMPMON.offset100) ...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-04-2019, 03:27 PM
    I don't speak CAN, but the NXP SDK (devices/MIMXRT1052/drivers/fsl_flexcan.c) has lines like base->MCR |= CAN_MCR_WRNEN_MASK | CAN_MCR_MAXMB(FSL_FEATURE_FLEXCAN_HAS_MESSAGE_BUFFER_MAX_NUMBERn(base) - 1); mcrTemp...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-04-2019, 03:13 PM
    ref manual says "This field can only be written in Freeze Mode as it is blocked by hardware in other modes" for MCR MAXMB field Are you in freeze mode?
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-04-2019, 03:02 PM
    I2C setClock() hack I hacked setClock() in hardware/teensy/avr/libraries/Wire/WireIMXRT.cpp to set I2C clocks to 100khz, 400khz, or 1MHz. void TwoWire::setClock(uint32_t frequency) { // thd using 24mhz clock,...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-03-2019, 11:30 PM
    1) make sure you have only one copy of Arduino on your machine. your Teensyduino might have done its thing on another copy. 2) you should see Teensy boards in the IDE if the Teensyduino install was successful 3) you...
    5 replies | 127 view(s)
  • manitou's Avatar
    01-03-2019, 10:11 PM
    You have a new project, ReadResolution and ReadAveraging and analogReference (not needed? REEFSEL has only one option) have not been implemented! https://github.com/PaulStoffregen/cores/blob/master/teensy4/analog.c ...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-03-2019, 09:30 PM
    T4 LPSPI does have FIFO -- or are you referring to another FIFO, i'm not familiar with all the ILI9341_T3 optimizations.
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-03-2019, 09:28 PM
    I think the core copies flash to RAM before starting ... so need SLOWRUN :D
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-03-2019, 06:22 PM
    DSP updates didn't make it into beta6 ?? dsp.zip
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-03-2019, 01:33 PM
    tone() tested With beta5 I tested tone() and noTone() with various pins, frequencies, durations. checked with scope. looks good to me. i marked it as Done in post #6
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-03-2019, 10:53 AM
    Paul, it looks like beta5 has the new arm_math.h, but boards.txt is still using -larm_cortexM4lf_math instead of -larm_cortexM7lfsp_math. And there were a couple more .h files needed as noted by mjs513 (post #228), and...
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-03-2019, 12:08 AM
    I just installed 1.8.8 1.46-beta5 on mac os. I still have to push the program button after an upload!
    932 replies | 19996 view(s)
  • manitou's Avatar
    01-02-2019, 07:47 PM
    Yep, float is about 2 times faster than double, see linpack in https://forum.pjrc.com/threads/54711-Teensy-4-0-First-Beta-Test?p=194187&viewfull=1#post194187 another test is lat-lon to UTM lots of trig functions...
    932 replies | 19996 view(s)
More Activity
About manitou

Basic Information

Statistics


Total Posts
Total Posts
1,783
Posts Per Day
0.82
Last Post
Teensy 4.0 First Beta Test Yesterday 02:15 PM
General Information
Last Activity
Today 11:42 AM
Join Date
01-28-2013