├── boot_hooks
    ├── CMakeLists.txt
    └── boot_hooks.c
└── README.md


/boot_hooks/CMakeLists.txt:
--------------------------------------------------------------------------------
 1 | if("$ENV{IDF_TARGET}" STREQUAL "esp32s3")
 2 | idf_component_register(SRCS "boot_hooks.c")
 3 | endif()
 4 | 
 5 | # We need to force GCC to integrate this static library into the
 6 | # bootloader link. Indeed, by default, as the hooks in the bootloader are weak,
 7 | # the linker would just ignore the symbols in the extra. (i.e. not strictly
 8 | # required)
 9 | # To do so, we need to define the symbol (function) `bootloader_hooks_include`
10 | # within hooks.c source file.
11 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # bootloader_components
 2 | 
 3 | bootloader hooks to avoid papers3 power issues
 4 | 
 5 | **Please clone this repository into your IDF project, at the same level as components.**
 6 | 
 7 | ## For example
 8 | 
 9 | ```bash
10 | .
11 | ├── bootloader_components  # <===== Here
12 | ├── components
13 | ├── main
14 | ├── managed_components
15 | ├── CMakeLists.txt
16 | ├── sdkconfig
17 | ├── sdkconfig.old
18 | └── version.txt
19 | ```
20 | 
21 | ## How to use
22 | 
23 | ```bash
24 | cd /path/to/your/project
25 | git clone https://github.com/m5stack/bootloader_components.git
26 | ```
27 | 


--------------------------------------------------------------------------------
/boot_hooks/boot_hooks.c:
--------------------------------------------------------------------------------
 1 | /*
 2 |  * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
 3 |  *
 4 |  * SPDX-License-Identifier: Apache-2.0
 5 |  */
 6 | #include "esp_log.h"
 7 | #include "soc/rtc_cntl_struct.h"
 8 | #include "soc/usb_serial_jtag_reg.h"
 9 | 
10 | /* Function used to tell the linker to include this file
11 |  * with all its symbols.
12 |  */
13 | void bootloader_hooks_include(void)
14 | {
15 | }
16 | 
17 | void bootloader_before_init(void)
18 | {
19 |     // Disable D+ pullup, to prevent the USB host from retrieving USB-Serial-JTAG's descriptor.
20 |     SET_PERI_REG_MASK(USB_SERIAL_JTAG_CONF0_REG, USB_SERIAL_JTAG_PAD_PULL_OVERRIDE);
21 |     CLEAR_PERI_REG_MASK(USB_SERIAL_JTAG_CONF0_REG, USB_SERIAL_JTAG_DP_PULLUP);
22 |     CLEAR_PERI_REG_MASK(USB_SERIAL_JTAG_CONF0_REG, USB_SERIAL_JTAG_USB_PAD_ENABLE);
23 | }
24 | 


--------------------------------------------------------------------------------