Difference between revisions of "UARTs"
From Gumstix User Wiki
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| − | Logic level (3.3V) signals | + | |
| − | + | * Logic level (3.3V) signals | |
| − | FFUART pins are located on the [[60pin connector|60-pin Hirose | + | * Speeds to 230 kbps |
| + | * Normally mapped to ttyS0 in the kernel and Y0 in some schematics | ||
| + | * FFUART pins are located on the [[60pin connector|60-pin Hirose]] connector | ||
| + | |||
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=== STUART === | === STUART === | ||
| + | |||
=== BTUART === | === BTUART === | ||
| + | |||
| + | |||
| + | {| border="1" cellpadding="5" cellspacing="0" style="width:100px" | ||
| + | |- | ||
| + | | style="background:dodgerblue;" | BT_CTS | ||
| + | |- | ||
| + | | style="background:dodgerblue;" | BT_RTS | ||
| + | |- | ||
| + | | style="background:dodgerblue;" | BT_TXD | ||
| + | |- | ||
| + | | style="background:dodgerblue;" | BT_RXD | ||
| + | |- | ||
| + | | style="background:dodgerblue;" | BT_NRESET | ||
| + | |} | ||
| + | |||
| + | |||
| + | * BTUART pins are located on the [[60pin connector|60-pin Hirose]] and [[24pin connector|24-pin flex ribbon]] connectors. | ||
| + | * It is not an exposed interface; mapped to ttyS1 by the kernel and connected physically to the bluetooth module if one is present. | ||
Revision as of 14:19, 14 March 2008
- Logic level (3.3V) signals
- FFUART speeds to 230 kbps (normally mapped to ttyS0 in the kernel and Y0 in some schematics )
- HWUART speeds to 921 kbps (normally mapped to ttyS3 in the kernel and Y1 in some schematics)
- Both can use RxD, TxD, RTS, CTS.
- STUART speeds to 230 kbps (normally mapped to ttyS2)
- BTUART is not an exposed interface; mapped to ttyS1 by the kernel and connected physically to the bluetooth module if one is present.
- Note! Current kernels use ttyS3 (HWUART) for bluetooth. This is available on the BTUART pins by setting GPIO42 and 43 to AF3 - and this is the default configuration. This can be very confusing if you want to use the HWUART for something else! To re-enable HWUART on ttyS3, make bluetooth use ttyS1 (see /etc/default/bluetooth) and then set GPIO42 to AF1 in and GPIO43 to AF2 out. You can then set GPIO48 to AF1 out (HWUART TXD) and GPIO49 to AF1 in (HWUART RXD).
http://docwiki.gumstix.org/Gumstix_UARTs
Contents
UARTs
FFUART
| FF_CTS |
| FF_RTS |
| FF_TXD |
| FF_RXD |
- Logic level (3.3V) signals
- Speeds to 230 kbps
- Normally mapped to ttyS0 in the kernel and Y0 in some schematics
- FFUART pins are located on the 60-pin Hirose connector
HWUART
STUART
BTUART
| BT_CTS |
| BT_RTS |
| BT_TXD |
| BT_RXD |
| BT_NRESET |
- BTUART pins are located on the 60-pin Hirose and 24-pin flex ribbon connectors.
- It is not an exposed interface; mapped to ttyS1 by the kernel and connected physically to the bluetooth module if one is present.
