Author: LisaZ_26 Version: **
Translation - Japanese: CCGxファームウェアのI2Cブートローダーの起動待機時間の設定、変更、および測定 – KBA228266 - Community Translated (JA)
Question 1: What is the default boot wait time for I2C bootloader?
Answer 1: Bootloader waits for a default timeout of 32 ms for I2C bootloader of CCG1/CCG2 and 50 ms for I2C bootloader of CCG3, CCG4, CCG4M, CCG5, and CCG6.
Question 2: Which macros are related to the boot wait window of I2C bootloader in the SDK firmware project?
Answer 2: The following macros in the boot.h file are related with the boot wait window of the I2C bootloader:
#define CCG_BL_WAIT_DEFAULT (50)
/**< Default boot-wait window for CCGx boot-loader: 50 ms */
#define CCG_BL_WAIT_MINIMUM (20)
/**< Minimum boot-wait window duration supported: 20 ms */
#define CCG_BL_WAIT_MAXIMUM (1000)
/**< Maximum boot-wait window duration supported: 1000 ms */
#define CCG_FWMETA_APPID_WAIT_DEF (0xFFFFu)
/**< FW metadata application ID value requesting default boot-wait window. */
#define CCG_FWMETA_APPID_WAIT_0 (0x4359)
/**< FW metadata application ID value requesting a zero boot-wait window. */
Question 3: How do I change the tBootWait period from 50 ms to 0 ms in the firmware project?
Answer 3: You can change the tBootWait period from 50 ms to 0 ms by changing the Application ID of the parameter “Bootoadable_1” from 0xFFFF to 0x4359 in the firmware project as shown in
Figure 1. Changing Bootloadable_1 Parameter
Question 4: How can I measure tBootWait in the system?
Answer 4: You can measure the tBootWait time period by adding a timer function. This function is called once the boot_start sequence initializes for a non-zero wait time defined by the variable boot_get_wait_time();.
See the following code snippet and the function timer_start() for more details.