TS-7970 Push Button: Difference between revisions
From embeddedTS Manuals
(Created page with "The push switch is accessed by reading FPGA registers: <source lang=bash> thswctl --addr 31 --peek </source> With no press bit 2 will be set so it will return "addr31=0x4". I...") |
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The push switch is accessed by reading FPGA registers: | The push switch is accessed by reading FPGA registers: | ||
<source lang=bash> | <source lang=bash> | ||
tshwctl --addr 31 --peek | |||
</source> | </source> | ||
With no press bit 2 will be set so it will return "addr31=0x4". If there is a press it will be cleared, so "addr31=0x0". | With no press bit 2 will be set so it will return "addr31=0x4". If there is a press it will be cleared, so "addr31=0x0". | ||
| Line 11: | Line 11: | ||
env save; | env save; | ||
</source> | </source> | ||
After this change u-boot will wait 1 second on every boot for the user to press ctrl+c to break into u-boot on startup. | |||
Latest revision as of 11:42, 13 February 2017
The push switch is accessed by reading FPGA registers:
tshwctl --addr 31 --peek
With no press bit 2 will be set so it will return "addr31=0x4". If there is a press it will be cleared, so "addr31=0x0".
This pin is sampled in u-boot to detect if it should stop in u-boot and look for usb updates. If this interferes with your intended usage you can boot to u-boot and disable this by running:
env delete preboot;
env set bootdelay 1;
env save;
After this change u-boot will wait 1 second on every boot for the user to press ctrl+c to break into u-boot on startup.