raspberrypi_usb_current
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+ | {{tag> | ||
+ | ~~TOC~~ | ||
+ | =====Raspberry Pi B+ USB current===== | ||
+ | You can change the RPI USB current limit. Keep in mind that the PSU also is able to deliver the current, e.g. 2Amp. | ||
+ | //All that max_usb_current=1 does is to set GPIO38 high, which in turn turns on a FET, which connects a second 39K resistor in parallel to an existing one, on pin 5 of U13, the AP2553W6 USB power manager, lifting the current limit from 0.6A to double that (1.2A)// | ||
+ | |||
+ | [[https:// | ||
+ | |||
+ | * Update to latest firmware: < | ||
+ | * Edit **/ | ||
+ | * Reboot | ||
+ | |||
+ | ===Verify=== | ||
+ | * Check gpio38, value should be ' | ||
+ | cd / | ||
+ | echo 38 > / | ||
+ | cat / | ||
+ | |||
+ | **OR** | ||
+ | |||
+ | * Install WiringPi: [[http:// | ||
+ | * Check: < | ||
+ | gpio version: 2.20 | ||
+ | Copyright (c) 2012-2014 Gordon Henderson | ||
+ | This is free software with ABSOLUTELY NO WARRANTY. | ||
+ | For details type: gpio -warranty | ||
+ | |||
+ | Raspberry Pi Details: | ||
+ | Type: Model B+, Revision: 1.2, Memory: 512MB, Maker: Sony</ | ||
+ | * Check values, GPIO 38 should be ' | ||
+ | 1</ |
raspberrypi_usb_current.txt · Last modified: 2021/10/09 15:14 by 127.0.0.1