disable jtag following the chip stuck

[jeffj2]

Posted on June 23, 2010 at 04:56

disable jtag following the chip stuck

[jeffj2]

Posted on May 17, 2011 at 13:55

Hi, thanks for your tips, it's work that I try as ur suggest use a new board, but the old one still, anyway thanks ur help!

[chikos332]

Posted on May 17, 2011 at 13:55

No,

normally you have at least three options:

 - Connect with Serial Wire Jtag (SW)

 - Set boot pins to RAM and connect with your JTAG

 - Connect with bootloader then set ReadProtection then disable ReadProtection (JTAG has nothing to do with Bootloader, you just have to power off/on you device before connecting to bootloader, reset is not sufficient in some cases)

For the bootloader connection make sure you have all the necessary condtions to connect (read the AN2606

http://www.st.com/stonline/products/literature/an/13801.pdf

:(

''

To connect to the STM32F105xx and STM32F107xx during System memory boot mode, the

following conditions have to be verified:

�? The RX pins of the unused peripherals in this bootloader have to be kept at a known

(low or high) level, and should not be left floating during the detection phase as

described below:

– If USART1 is used to connect to the bootloader: the USART2_RX (PD6),

CAN2_RX (PB5), OTG_FS_DM (PA11) and OTG_FS_DP (PA12) pins have to be

kept at a high or low level and must not be left floating during the detection phase.

– If USART2 is used to connect to the bootloader: the USART1_RX (PA10),

CAN2_RX (PB5), OTG_FS_DM (PA11) and OTG_FS_DP (PA12) pins have to be

kept at a high or low level and must not be left floating during the detection phase.

– If CAN2 is used to connect to the bootloader: the USART1_RX (PA10),

USART2_RX (PD6), OTG_FS_DM (PA11) and OTG_FS_DP (PA12) pins have to

be kept at a high or low level and must not be left floating during the detection

phase.

– If DFU is used to connect to the bootloader: the USART1_RX (PA10),

USART2_RX (PD6) and CAN2_RX (PB5) pins have to be kept at a high or low

level and must not be left floating during the detection phase.

�? Connect to the peripheral to be used through:

– an RS232 serial interface (example, ST3232 RS232 transceiver) has to be directly

connected to the USART1_RX (PA10) and USART1_TX (PA9) pins when

USART1 is used, or to the USART2_RX (PD6) and USART2_TX (PD5) pins when

USART2 is used

– a CAN interface (CAN transceiver) has to be directly connected to the CAN2_RX

(PB5) and CAN2_TX (PB6) pins

– a certified USB cable has to be connected to the microcontroller (optionally an

ESD protection circuitry can be used)

''

For future think about keeping a piece of code resetting JTAG options when needed (using a GPIO state/exti ...).