![]() JP Gleyzes has updated details to Retrofitting an old laser engraver.xberger liked ESPBell-MAX and LITE Intercom / Doorbell IoT modul.Alice Chan_Elecrow liked Clone of CA80.lion mclionhead has updated the log for Backflow starship incense burner.Thomas Perrot liked Custom Handheld Pi Zero HQ Camera.mkdxdx has updated the project titled Mriya keyboard.Shannon on NASA’s Tech Demo Streams First Video From Deep Space Via Laser.sweethack on Australia Bans Engineered Stone, Workers Elsewhere Demand The Same.I guess the extra 4 come from the overhead of getting the start time, then calculating the run time. (edit to add): I just tried it here and got 24 usec for 320 NOPs. You want 20 usec, so 20e-6 / 62.5e-9 320, therefore you need 320 NOPS. Panek on Ask Hackaday: What Do You Do When You Can’t Solder? A NOP takes 1 CPU cycle, so a NOP needs 1 / 16e6 seconds 62.5 nsec. CampGareth on Reverse-Engineering The Stadia Controller Bluetooth Switching Procedure.Stephen on Bringing APL To The Masses: The History Of The IBM 5100.Alex on Australia Bans Engineered Stone, Workers Elsewhere Demand The Same.anon on Reverse-Engineering The Stadia Controller Bluetooth Switching Procedure.Jan on NASA’s Tech Demo Streams First Video From Deep Space Via Laser.You Can’t Make What You Can’t Measure 29 Comments Posted in ARM, Raspberry Pi Tagged assembly language Post navigation If you want to go bare metal, we’ve been there, too. If you are more interested in 64-bit Intel/AMD CPUs, we can help. If you have interest in assembly language, it is an easy way to dip your toe into the ARM waters. But after the obligatory stop at “Hello world”, you’ll find programs like “Find the Otter” and “Hex and Love” (see the video below) to challenge your burgeoning skill. The first few sections are what you might expect: program basics and a memory map tutorial. if you have the right hardware, there are sections on using the floating point unit and the NEON co-processor, too. The compiler, of course, is gcc and all the associated tools. ![]() You need a 32-bit ARMv6 or better - so Raspberry Pi will work here. But you can get a great starting tutorial with the 21 programs on the ARM Assembly by Example website. ![]() Of course, sometimes fewer instructions actually make things more difficult. ![]() The CPU only has about 30 distinct operations - that’s why it is called RISC. But do you know ARM assembly language? Well, if you look at it one way, it can’t be too hard. If you program in C, you probably don’t care much or even think about it. From Raspberry Pis, to phones, to Blue Pill Arduino-like boards, you don’t have to go far to find an ARM processor these days. (This software works with AVR and ESP8266 architecture) This is a tool help to convert Arduino C/C++ code to Assembly code. Convert your Arduino C/C++ code to Assembly code. This will go into an infinite loop for continuously blinking the LED.Ĭomplete code attached in the Code Section.The ARM processor is popping up everywhere. Download Arduino to Assembly Converter for free. The timer is stopped to reset the overflow flag and toggle the LED LDI R16, 0x01 STS TIFR1, R16 Clear the overflow flag by writing 1 to it COM R17 Complement R17 register STS PORTB, R17 Toggle the LED output LDI R16, 0x00 STS TCCR1B, R16 Stop the Timer/Counter1 This can be done by checking the overflow flag, i.e, the 0 bit of the TIFR1 register. This is a loop, used to wait for 1 second, till the overflow occurs in the Timer/Counter1. L: LDS R0, TIFR1 Load the value of TIFR1 into R0 SBRS R0, 0 Skip the next statement if overflow has occured. The Timer/Counter1 is turned ON once the value is written into TCCR1B with the given Prescaler. LDI R16, 0x05 STS TCCR1B, R16 Writing 0x05 into TCCR1BĠx05H => 0000 0101B is set as the bits for TCCR1B as no input capture is used and a Prescaler of 1024 is used, hence 101 for CS12, CS11, and CS10 respectively. The upcoming code will go into the loop segment: LDI R16, 0xC2 STS TCNT1H, R16 Writing 0xC2 into TCNT1H (8-bit) LDI R16, 0xF7 STS TCNT1L, R16 Writing 0xF7 into TCNT1H (8-bit)Īs calculated using the formula the 16-bit value of 0xC2F7 is stored as separate 8-bit values into the upper and lower TCNT registers. All bits of TCCR1A are set to 0 as no output compare of waveform generation is used. Producing a delay using the Timer/Counter1: LDI R16, 0x01 STS DDRB, R16 Setting 1st bit of PORTB as output LDI R17, 0x00 STS PORTB, R17 Writing 0 to PORTB (LED OFF) LDI R16, 0x00 STS TCCR1A, R16 Setting all bits of TCCR1A as 0Īn LED is connected to the PB0 pin and configured as an output. This register has the flags connected to different modules in the timer/Counter1
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