Why don't you just call your local TI distributor? They will be happy to
steer you in the right direction, and can probably help with samples.
There are lots of examples of how to implement a UART with software ("bit
banging"), but it's an ugly job. Of course, if you're only sending,
and not receiving, data, it's a lot easier since you don't have to
synchronize/oversample the sender's data.
What are you communicating with? Do you HAVE to use UART?
Stuart
--- In m..., "merapcb" wrote: > Hi. I am looking for a small and cheap ($2-3) MSP
with a single UART but all I can find seem to have just I2C/SPI (or I am not
searching the TI site correctly). What would be a good choice? The requirements
are very simple as follows:
> - Single UART (for serial comm)
> - 10 I/Os
> - Speed not important, no PWM/ADC/etc
>
> Of course, they need to be largely available on Farnell etc. and with samples
available from TI......
>
> Thanks
>
The F2112 costs US$2.20 in 250 lots from Digikey and AUS$2.56/100 from
farnell, vs US$0.84 for the superior spec'd G2432 in 250 lots from
Mouser.
Al
On 20/01/2011 2:14 AM, Dirk Rapp wrote: > Hi,
>
> if I read it correctly, the F2112 has an UART too.
> It is cheaper and available at Farnell/Digikey.
>
> Regards
>
> Dirk
>
> Am 19.01.2011 15:12, schrieb OneStone:
>> The F2xx series is generally cheaper than the F1xx, and has better DCO
>> stability, especially on the so called calibrated frequencies. The G2xx
>> series now goes to 8k flash, but is limited by a single calibrated
>> frequency. Using the calibrated frequencies of the DCO I find that you
>> can reliably communicate at much higher baud rates even when bit
>> banging. Bit banging uses very little code space, and you can easily
>> implement full duplex if you need to, it depends on how much other code
>> you need to deal with, other than the comms routines as to whether you
>> could fit into a 8k device. The G2452 top of the range G2xxx series is
>> listed at $2.45 single quantities on Digikey, but, as usual, neither
>> Digikey nor Mouser has any stock.
>>
>> Cheers
>>
>> Al
>>
>> The smallest device with a hardware UART is the 2132
>>
>> On 19/01/2011 11:21 PM, merapcb wrote:
>>> Hi. I am looking for a small and cheap ($2-3) MSP with a single UART
>> but all I can find seem to have just I2C/SPI (or I am not searching
>> the TI site correctly). What would be a good choice? The requirements
>> are very simple as follows:
>>> - Single UART (for serial comm)
>>> - 10 I/Os
>>> - Speed not important, no PWM/ADC/etc
>>>
>>> Of course, they need to be largely available on Farnell etc. and
>> with samples available from TI......
>>> Thanks
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
Reply by Dirk Rapp●January 19, 20112011-01-19
Hi,
if I read it correctly, the F2112 has an UART too.
It is cheaper and available at Farnell/Digikey.
Regards
Dirk
Am 19.01.2011 15:12, schrieb OneStone: >
> The F2xx series is generally cheaper than the F1xx, and has better DCO
> stability, especially on the so called calibrated frequencies. The G2xx
> series now goes to 8k flash, but is limited by a single calibrated
> frequency. Using the calibrated frequencies of the DCO I find that you
> can reliably communicate at much higher baud rates even when bit
> banging. Bit banging uses very little code space, and you can easily
> implement full duplex if you need to, it depends on how much other code
> you need to deal with, other than the comms routines as to whether you
> could fit into a 8k device. The G2452 top of the range G2xxx series is
> listed at $2.45 single quantities on Digikey, but, as usual, neither
> Digikey nor Mouser has any stock.
>
> Cheers
>
> Al
>
> The smallest device with a hardware UART is the 2132
>
> On 19/01/2011 11:21 PM, merapcb wrote:
> > Hi. I am looking for a small and cheap ($2-3) MSP with a single UART
> but all I can find seem to have just I2C/SPI (or I am not searching
> the TI site correctly). What would be a good choice? The requirements
> are very simple as follows:
> > - Single UART (for serial comm)
> > - 10 I/Os
> > - Speed not important, no PWM/ADC/etc
> >
> > Of course, they need to be largely available on Farnell etc. and
> with samples available from TI......
> >
> > Thanks
> >
> >
> >
> >
> >
> >
> >
> >
> >
Reply by OneStone●January 19, 20112011-01-19
The F2xx series is generally cheaper than the F1xx, and has better DCO
stability, especially on the so called calibrated frequencies. The G2xx
series now goes to 8k flash, but is limited by a single calibrated
frequency. Using the calibrated frequencies of the DCO I find that you
can reliably communicate at much higher baud rates even when bit
banging. Bit banging uses very little code space, and you can easily
implement full duplex if you need to, it depends on how much other code
you need to deal with, other than the comms routines as to whether you
could fit into a 8k device. The G2452 top of the range G2xxx series is
listed at $2.45 single quantities on Digikey, but, as usual, neither
Digikey nor Mouser has any stock.
Cheers
Al
The smallest device with a hardware UART is the 2132
On 19/01/2011 11:21 PM, merapcb wrote: > Hi. I am looking for a small and cheap ($2-3) MSP
with a single UART but all I can find seem to have just I2C/SPI (or I am not
searching the TI site correctly). What would be a good choice? The requirements
are very simple as follows:
> - Single UART (for serial comm)
> - 10 I/Os
> - Speed not important, no PWM/ADC/etc
>
> Of course, they need to be largely available on Farnell etc. and with samples
available from TI......
>
> Thanks
>
Reply by Leon Heller●January 19, 20112011-01-19
On 19/01/2011 13:44, merapcb wrote: > --- In m..., Leon Heller wrote:
>
>>
>> I'd use a PIC for that sort of application.
>> True, or a 8051 derivative. But for the moment I sort of want/have to stick
to the MSP toolchain. It wwould be more sensible to choose the ideal device for the
application. I'd use the 14-pin 16F1823:
It's an XLP device with equivalent power consumption to the MSP430, and
is under $1 in quantity.
Leon
--
Leon Heller
G1HSM
Reply by merapcb●January 19, 20112011-01-19
--- In m..., Leon Heller wrote:
>
> I'd use a PIC for that sort of application.
>
True, or a 8051 derivative. But for the moment I sort of want/have to stick to
the MSP toolchain.
Reply by Leon Heller●January 19, 20112011-01-19
On 19/01/2011 12:51, merapcb wrote: >
> Hi. I am looking for a small and cheap ($2-3) MSP with a single UART but all I
can find seem to have just I2C/SPI (or I am not searching the TI site
correctly). What would be a good choice? The requirements are very simple as
follows:
> - Single UART (for serial comm)
> - 10 I/Os
> - Speed not important, no PWM/ADC/etc
>
> Of course, they need to be largely available on Farnell etc. and with samples
available from TI...... I'd use a PIC for that sort of application.
Leon
--
Leon Heller
G1HSM
Reply by "Okey, Ian"●January 19, 20112011-01-19
I have used Timer A on F1XX, F2xxx and F5xxx devices to implement a third UART.
The only real problem that I have had is that you get one interrupt per bit
transferred in either direction. This limits the baud rate that the processor
can handle. I generally use a ~4MHz clock as the timer source and 9600 baud
data rates without any problems.
Ian
From: m... [mailto:m...] On Behalf Of merapcb
Sent: 19 January 2011 13:13
To: m...
Subject: [msp430] Re: Small MSP430 with UART?
--- In m..., Bill Knight wrote:
> > Of course, they need to be largely available on
Farnell etc. and with samples available from TI......
>
> If cost and availability are a concern (large volume project), consider
> the smallest MSP that has sufficient I/O & code space and use the timer
> to implement a software UART.
>
Yes I thought of bit banging the UART while looking at the F11x series but
basically prefer not to do it (don't know why, maybe it's so straight
forward). Regarding quantities, no, it is not mass produced and that is why I
have to rely on it basically being available from the online vendors.
Reply by merapcb●January 19, 20112011-01-19
--- In m..., Bill Knight wrote:
> > Of course, they need to be largely available on
Farnell etc. and with samples available from TI......
>
> If cost and availability are a concern (large volume project), consider
> the smallest MSP that has sufficient I/O & code space and use the timer
> to implement a software UART.
>
Yes I thought of bit banging the UART while looking at the F11x series but
basically prefer not to do it (don't know why, maybe it's so straight
forward). Regarding quantities, no, it is not mass produced and that is why I
have to rely on it basically being available from the online vendors.
Reply by Bill Knight●January 19, 20112011-01-19
On 1/19/2011 6:51 AM, merapcb wrote: >
> Hi. I am looking for a small and cheap ($2-3) MSP with a single UART but all I
can find seem to have just I2C/SPI (or I am not searching the TI site
correctly). What would be a good choice? The requirements are very simple as
follows:
> - Single UART (for serial comm)
> - 10 I/Os
> - Speed not important, no PWM/ADC/etc
>
> Of course, they need to be largely available on Farnell etc. and with samples
available from TI......
If cost and availability are a concern (large volume project), consider
the smallest MSP that has sufficient I/O & code space and use the timer
to implement a software UART.
