nuttx/arch/z80
Byron Ellacott 1105cf0669 ez80: fix several bugs in emac driver
IRQs cannot be individually disabled on the eZ80, so using
`up_disable_irq()` had no effect. This left the IRQ handler being
constantly triggered without the lower half handler running.

The macro for EMAC stats was incompatible with Clang. The simplified
form gives identical results under ZDS-II.

The MII clock speed must be set before trying to read MII registers.
It's now done before resetting the PHY using the Mode Control Register.

MII initialization waited on the auto-neogotiate restart bit being set
but PHY hardware is frequently fast enough to have cleared the bit
before the first read of it. It now instead just waits on auto-negotiate
completing. The MII poll loop now uses `up_mdelay` because it was far
too fast at 50MHz using a busy loop, giving time for a link to be
established.

Bad packets are now processed enough to release their buffers back to
the EMAC hardware.

A few typos, unused variables, and other miscellaneous issues were also
fixed.
2021-02-26 03:25:58 -06:00
..
include z80/inttypes.h: Add INT24_C and UINT24_C function macros 2021-02-18 18:35:35 -08:00
src ez80: fix several bugs in emac driver 2021-02-26 03:25:58 -06:00
Kconfig arch: Add custom arch chip build support 2020-10-20 14:48:16 +08:00