piolib: IRQ support, dmactrl access, FIFO flags etc.#204
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Don't leave an undefined value when a bad compatible string is detected. Signed-off-by: Phil Elwell <phil@raspberrypi.com>
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
Perform the full block transfer, with or without DMA, before using common data comparison code. Signed-off-by: Phil Elwell <phil@raspberrypi.com>
Add methods to read the DMACTRL register and the FIFO error flags (although a stall isn't really an error). Signed-off-by: Phil Elwell <phil@raspberrypi.com>
Monitor the DREQ status as the FIFO is filled and emptied, and tidy up the code by adding a check() function (a runtime assertion). Signed-off-by: Phil Elwell <phil@raspberrypi.com>
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
irqhog claims a PIO interrupt and waits, to force other PIO clients to use the other interrupt. Signed-off-by: Phil Elwell <phil@raspberrypi.com>
irqtest2 loads a state machine program that generates interrupts and waits for response signals on a GPIO. Side signals can be used with a logic analyser to measure intervals. Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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If run with a suitably up-to-date kernel and RP1 firmware (in the Pi 5 EEPROM image), these patches give userspace support for PIO interrupts. They also allow the dmactrl register and FIFO flags to be read, and include a number of new and improved test applications.