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Re: [Qemu-devel] [RFC v4 4/5] hw/arm/digic: add UART support
From: |
Peter Maydell |
Subject: |
Re: [Qemu-devel] [RFC v4 4/5] hw/arm/digic: add UART support |
Date: |
Fri, 6 Sep 2013 14:40:14 +0100 |
On 6 September 2013 14:00, Antony Pavlov <address@hidden> wrote:
> On Fri, 6 Sep 2013 08:25:20 +0100
> Peter Maydell <address@hidden> wrote:
>> You can deduce its existence though -- does the
>> UART let you feed two or three characters to it
>> at faster than whatever the serial line speed is
>> before it sets the "stop sending me bits" status
>> bit, or does it stop after the first?
>
> No, I can't :)
>
> How can I check this mysterious "stop sending me bits" status bit?
> Do you mean the UART hardware flow control pin?
I meant ST_TX_RDY, but looking again at the
docs perhaps I misinterpreted it. Do you really
have to do:
* write byte to TX register
* set TX_RDY bit in status register
to get it to send out a byte?
I was expecting a more standard UART interface
which is typically:
* write byte to TX register
* if the UART is unable to accept any more
bytes (ie FIFO full, or just immediately if
no FIFO present) it clears TX_RDY
* software has to wait for TX_RDY to be set
before writing another byte to TX
-- PMM
- Re: [Qemu-devel] [RFC v4 1/5] hw/arm: add very initial support for Canon DIGIC SoC, (continued)
[Qemu-devel] [RFC v4 3/5] hw/arm/digic: add timer support, Antony Pavlov, 2013/09/05
[Qemu-devel] [RFC v4 4/5] hw/arm/digic: add UART support, Antony Pavlov, 2013/09/05
- Re: [Qemu-devel] [RFC v4 4/5] hw/arm/digic: add UART support, Peter Maydell, 2013/09/05
- Re: [Qemu-devel] [RFC v4 4/5] hw/arm/digic: add UART support, Antony Pavlov, 2013/09/06
- Re: [Qemu-devel] [RFC v4 4/5] hw/arm/digic: add UART support, Peter Maydell, 2013/09/06
- Re: [Qemu-devel] [RFC v4 4/5] hw/arm/digic: add UART support, Antony Pavlov, 2013/09/06
- Re: [Qemu-devel] [RFC v4 4/5] hw/arm/digic: add UART support,
Peter Maydell <=
- Re: [Qemu-devel] [RFC v4 4/5] hw/arm/digic: add UART support, Antony Pavlov, 2013/09/07
- Re: [Qemu-devel] [RFC v4 4/5] hw/arm/digic: add UART support, Peter Maydell, 2013/09/07
[Qemu-devel] [RFC v4 2/5] hw/arm/digic: prepare DIGIC-based boards support, Antony Pavlov, 2013/09/05
[Qemu-devel] [RFC v4 5/5] hw/arm/digic: add NOR ROM support, Antony Pavlov, 2013/09/05