LIN 中断检测标志对 ARM STM32 设备意味着什么？
What does the LIN break detection flag mean for ARM STM32 devices?
STM32F4xx系列中有一个UART错误标志就是
Bit 8 LBD: the LIN break detection flag
没有这方面的进一步信息。这对 UART 意味着什么？
来自参考手册 RM0090:
LIN reception
A break detection circuit is implemented on the USART interface. The
detection is totally independent from the normal USART receiver. A
break can be detected whenever it occurs, during Idle state or during
a frame.
When the receiver is enabled (RE=1 in USART_CR1), the circuit looks at
the RX input for a start signal. The method for detecting start bits
is the same when searching break characters or data. After a start bit
has been detected, the circuit samples the next bits exactly like for
the data (on the 8th, 9th and 10th samples). If 10 (when the LBDL = 0
in USART_CR2) or 11 (when LBDL=1 in USART_CR2) consecutive bits are
detected as ‘0, and are followed by a delimiter character, the LBD
flag is set in USART_SR. If the LBDIE bit=1, an interrupt is
generated. Before validating the break, the delimiter is checked for
as it signifies that the RX line has returned to a high level.
If a ‘1 is sampled before the 10 or 11 have occurred, the break
detection circuit cancels the current detection and searches for a
start bit again.
If the LIN mode is disabled (LINEN=0), the receiver continues working
as normal USART, without taking into account the break detection.
If the LIN mode is enabled (LINEN=1), as soon as a framing error
occurs (i.e. stop bit detected at ‘0, which will be the case for any
break frame), the receiver stops until the break detection circuit
receives either a ‘1, if the break word was not complete, or a
delimiter character if a break has been detected.
STM32F4xx系列中有一个UART错误标志就是
Bit 8 LBD: the LIN break detection flag
没有这方面的进一步信息。这对 UART 意味着什么？
来自参考手册 RM0090:
LIN reception
A break detection circuit is implemented on the USART interface. The detection is totally independent from the normal USART receiver. A break can be detected whenever it occurs, during Idle state or during a frame.
When the receiver is enabled (RE=1 in USART_CR1), the circuit looks at the RX input for a start signal. The method for detecting start bits is the same when searching break characters or data. After a start bit has been detected, the circuit samples the next bits exactly like for the data (on the 8th, 9th and 10th samples). If 10 (when the LBDL = 0 in USART_CR2) or 11 (when LBDL=1 in USART_CR2) consecutive bits are detected as ‘0, and are followed by a delimiter character, the LBD flag is set in USART_SR. If the LBDIE bit=1, an interrupt is generated. Before validating the break, the delimiter is checked for as it signifies that the RX line has returned to a high level.
If a ‘1 is sampled before the 10 or 11 have occurred, the break detection circuit cancels the current detection and searches for a start bit again.
If the LIN mode is disabled (LINEN=0), the receiver continues working as normal USART, without taking into account the break detection.
If the LIN mode is enabled (LINEN=1), as soon as a framing error occurs (i.e. stop bit detected at ‘0, which will be the case for any break frame), the receiver stops until the break detection circuit receives either a ‘1, if the break word was not complete, or a delimiter character if a break has been detected.