Teensy 4.1 does not support bit-band?
- Thread starter W5ZZO
- Start date
PaulStoffregen
Well-known member
Indeed, no bitband in M7.
KurtE
Senior Member+
Yes - Been there!
Note for GPIO, the IMXRT 1060 has some things that can help with atomic operations (like the bitband was used for T3.x)
That is each GPIO port, has some additional registers, to Set, Clear and Toggle bits on the port. Only pins that you pass a 1 bit for are affected
Note for GPIO, the IMXRT 1060 has some things that can help with atomic operations (like the bitband was used for T3.x)
That is each GPIO port, has some additional registers, to Set, Clear and Toggle bits on the port. Only pins that you pass a 1 bit for are affected
W5ZZO
Well-known member
Thanks for the tip.
I don't have a mission-critical need for bit-band, but I combed through the INXRT 1060 datasheet, and while it has the bit alias addresses marked reserved, I was still unsure.
I will study the port registers you mentioned. While I am just a hobbyist, I have been bit-banging since the 80C51 days.
- Wes, W5ZZO
I don't have a mission-critical need for bit-band, but I combed through the INXRT 1060 datasheet, and while it has the bit alias addresses marked reserved, I was still unsure.
I will study the port registers you mentioned. While I am just a hobbyist, I have been bit-banging since the 80C51 days.
- Wes, W5ZZO
PaulStoffregen
Well-known member
Those GPIO bit set, clear, toggle registers are used in the most efficient way if you use digitalWriteFast() or digitalToggleFast() in your code, and the pin number is a compile-time constant. No need to mess with the registers directly, unless you really prefer that over easily readable code.