Comments (2)
Thanks for the suggestion! While RPPAL doesn't currently provide that functionality, It would technically be possible to combine register writes for multiple pins. I can imagine a batch_write
function (and possibly a batch_read
) that takes a list of OutputPin
s and states, and combines those into fewer writes.
The BCM2711 uses 4 registers to set/clear pin states (GPSET0, GPSET1, GPCLR0, GPCLR1). In the worst case scenario you'd go from writing 6 32-bit values to 4 (possibly as a single 128-bit write), plus the overhead (either in the library or the end-user code) of sorting through the list of pins. I think it's worth implementing as a convenience function for parallel interfaces, with any performance gains as a bonus.
I'll put this on the list of requested changes and see if we can get it into a future update.
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Thanks for considering it. I'm actually getting pretty acceptable performance from what I can tell (though I don't have a logic analyzer at home for my hobby projects) setting them one at a time. If it's just a convenience function, I can just write a wrapper that takes an array of pins. In hindsight, trying to set them via the set/clear registers potentially adds a lot of support work since it might be unique to each Raspberry PI SOC.
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Related Issues (20)
- Raspberry Pi5 HOT 57
- Banana Pi M5 support HOT 2
- Support concurrent reading and writing via Uart
- Using rppal with embedded_hal_async (async support) HOT 8
- Hardware field removed from /proc/cpuinfo causing identification issues HOT 5
- GPIO `is_low` output differs from rppal v0.17.0 impl compared to embedded-hal v1 impl
- No PWM on a raspberry pi 5 HOT 13
- Input pin mode not set correctly on Raspberry Pi 5 HOT 1
- Add an example of graceful shutdown when SIGINT (GPIO) HOT 1
- I2C connection with ADS1115 HOT 2
- pwm (or more specififally: ) the example `pwm_blinkled.rs` does not seem to work on my raspberry pi zero w HOT 6
- Multiple slave select lines on one SPI bus HOT 2
- Thanks for rppal, showcase of our app using it, and question HOT 5
- Many edge detection "interrupts" but level remains the same HOT 39
- Possible to read config at startup and detect busy pins HOT 2
- SimpleHalSpiDevice does not execute all operations in a single transaction HOT 3
- UART. Losing chars on read HOT 4
- Pi5 HW PWM not working HOT 7
- Support re-configuring pull mode on InputPins after construction HOT 2
- UART: documentation HOT 1
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