Debug Mode - STMicroelectronics RM0365 Reference Manual

RM0365
This is done in the following steps:
1. Configure the corresponding DMA channel as follows:
–
–
–
–
2. Configure the DCR register by configuring the DBA and DBL bit fields as follows:
DBL = 3 transfers, DBA = 0xE.
3. Enable the TIMx update DMA request (set the UDE bit in the DIER register).
4. Enable TIMx
5. Enable the DMA channel
This example is for the case where every CCRx register to be updated once. If every CCRx
register is to be updated twice for example, the number of data to transfer should be 6. Let's
take the example of a buffer in the RAM containing data1, data2, data3, data4, data5 and
data6. The data is transferred to the CCRx registers as follows: on the first update DMA
request, data1 is transferred to CCR2, data2 is transferred to CCR3, data3 is transferred to
CCR4 and on the second update DMA request, data4 is transferred to CCR2, data5 is
transferred to CCR3 and data6 is transferred to CCR4.
Note: A null value can be written to the reserved registers.
20.3.28

Debug mode

When the microcontroller enters debug mode (Cortex-M4
either continues to work normally or stops, depending on DBG_TIMx_STOP configuration
bit in DBG module.
For safety purposes, when the counter is stopped (DBG_TIMx_STOP = 1), the outputs are
disabled (as if the MOE bit was reset). The outputs can either be forced to an inactive state
(OSSI bit = 1), or have their control taken over by the GPIO controller (OSSI bit = 0),
typically to force a Hi-Z.
For more details, refer to
I2C.
For safety purposes, when the counter is stopped (DBG_TIMx_STOP = 1), the outputs are
disabled (as if the MOE bit was reset). The outputs can either be forced to an inactive state
(OSSI bit = 1), or have their control taken over by the GPIO controller (OSSI bit = 0) to force
them to Hi-Z.
DMA channel peripheral address is the DMAR register address
DMA channel memory address is the address of the buffer in the RAM containing
the data to be transferred by DMA into CCRx registers.
Number of data to transfer = 3 (See note below).
Circular mode disabled.
Section 33.14.2: Debug support for timers, watchdog, bxCAN and
DocID025202 Rev 7
Advanced-control timers (TIM1)
®
F core halted), the TIMx counter
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