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Merge pull request #816 from andrewshadura/usbtiny-spi

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Add SPI support to USBtiny
This commit is contained in:
Jörg Wunsch
2022-01-21 21:40:00 +01:00
committed by GitHub
parent 512cce405c 40f0fae5a4
commit 490558049e
3 changed files with 44 additions and 2 deletions
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src/avrdude.1
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@@ -838,7 +838,7 @@ Display the device signature bytes.
Enter direct SPI mode. The
.Em pgmled
pin acts as slave select.
.Em Only supported on parallel bitbang programmers.
.Em Only supported on parallel bitbang programmers, and partially by USBtiny.
.It Ar part
Display the current part settings and parameters. Includes chip
specific information including all memory types supported by the
@@ -1282,7 +1282,8 @@ This also applies to the STK500 and STK600 in parallel programming mode.
.Pp
The USBasp and USBtinyISP drivers do not offer any option to distinguish multiple
devices connected simultaneously, so effectively only a single device
is supported.
is supported. Slave Select must be externally held low for direct SPI when
using USBtinyISP, and send must be a multiple of four bytes.
.Pp
The avrftdi driver allows one to select specific devices using any combination of vid,pid
serial number (usbsn) vendor description (usbvendoror part description (usbproduct)