Re: [PATCH 08/12] next-cube.c: move LED logic to new next_scr2_led_update() function

[Thomas Huth]

Am Fri, 15 Dec 2023 20:00:05 +0000
schrieb Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>:

> Ensure that the LED status is updated by calling next_scr2_led_update() 
> whenever
> the SC2 register is written.
> 
> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
> ---
>  hw/m68k/next-cube.c | 22 +++++++++++++---------
>  1 file changed, 13 insertions(+), 9 deletions(-)
> 
> diff --git a/hw/m68k/next-cube.c b/hw/m68k/next-cube.c
> index f2222554fa..7ffd1c412e 100644
> --- a/hw/m68k/next-cube.c
> +++ b/hw/m68k/next-cube.c
> @@ -123,6 +123,18 @@ static const uint8_t rtc_ram2[32] = {
>  #define SCR2_RTDATA 0x4
>  #define SCR2_TOBCD(x) (((x / 10) << 4) + (x % 10))
>  
> +static void next_scr2_led_update(NeXTPC *s)
> +{
> +    if (s->scr2 & 0x1) {
> +        DPRINTF("fault!\n");
> +        s->led++;
> +        if (s->led == 10) {
> +            DPRINTF("LED flashing, possible fault!\n");
> +            s->led = 0;
> +        }
> +    }
> +}

This will now operate on the old value of scr2 ...

>  static void nextscr2_write(NeXTPC *s, uint32_t val, int size)
>  {
>      static uint8_t old_scr2;
> @@ -135,15 +147,6 @@ static void nextscr2_write(NeXTPC *s, uint32_t val, int 
> size)
>          scr2_2 = val & 0xFF;
>      }
>  
> -    if (val & 0x1) {
> -        DPRINTF("fault!\n");
> -        s->led++;
> -        if (s->led == 10) {
> -            DPRINTF("LED flashing, possible fault!\n");
> -            s->led = 0;
> -        }
> -    }

.. while this was using the new value that was just written.
So this looks wrong to me ... or do I miss something?

 Thomas


>      if (scr2_2 & 0x1) {
>          /* DPRINTF("RTC %x phase %i\n", scr2_2, rtc->phase); */
>          if (rtc->phase == -1) {
> @@ -318,6 +321,7 @@ static void next_mmio_write(void *opaque, hwaddr addr, 
> uint64_t val,
>          break;
>  
>      case 0xd000 ... 0xd003:
> +        next_scr2_led_update(s);
>          nextscr2_write(s, val, size);
>          break;
>