X-Git-Url: http://git.linex4red.de/pub/lufa.git/blobdiff_plain/0c15a451280d2ff2b2fd962b4c3f9fc4812d3cbf..f469eb7745b52029d57636334b2e3f4e511bc968:/Bootloaders/CDC/BootloaderCDC.txt?ds=inline diff --git a/Bootloaders/CDC/BootloaderCDC.txt b/Bootloaders/CDC/BootloaderCDC.txt index 55e5e55a4..f8c349cde 100644 --- a/Bootloaders/CDC/BootloaderCDC.txt +++ b/Bootloaders/CDC/BootloaderCDC.txt @@ -59,9 +59,17 @@ * * \section Sec_Running Running the Bootloader * - * This bootloader is designed to be started via the HWB mechanism of the USB AVRs; ground the HWB pin (see device - * datasheet) then momentarily ground /RESET to start the bootloader. This assumes the HWBE fuse is set and the BOOTRST - * fuse is cleared. + * On the USB AVR8 devices, setting the \c HWBE device fuse will cause the bootloader to run if the \c HWB pin of + * the AVR is grounded when the device is reset. + * + * The are two behaviours of this bootloader, depending on the device's fuses: + * + * If the device's BOOTRST fuse is set, the bootloader will run any time the system is reset from + * the external reset pin, unless no valid user application has been loaded. To initiate the bootloader, the + * device's external reset pin should be grounded momentarily. + * + * If the device's BOOTRST fuse is not set, the bootloader will run only if initiated via a software + * jump, or if the \c HWB pin was low during the last device reset (if the \c HWBE fuse is set). * * For board specific exceptions to the above, see below. * @@ -196,12 +204,6 @@ * access. * See here for resolution steps. * - * \par After loading an application, it is not run automatically on startup. - * Some USB AVR boards ship with the BOOTRST fuse set, causing the bootloader - * to run automatically when the device is reset. In most cases, the BOOTRST - * fuse should be disabled and the HWBE fuse used instead to run the bootloader - * when needed. - * * \section Sec_Options Project Options * * The following defines can be found in this demo, which can control the demo behaviour when defined, or changed in value.