I have some confusions about the difference between write back + write allocate and write back + write no allocate on Cortex CM4.
As my original understanding:
- For write back with write allocate:
- If write-address isn't cache hinted yet, cache line…
I have some confusions about the difference between write back + write allocate and write back + write no allocate on Cortex CM4.
As my original understanding:
Hi
I am compiling below assembly language code for ARM Cortex M4 using IAR Workbench and getting error, could some one help me on this. calling BadWebConfig_Txt from C code.
#define code_ADDRESS(a) ((a)>>24 & 0ffH,(a)>>16 & 0ffH,(a)>>8 & 0ffH,(a) & 0ffH…
Many implementations on Cortex requires true random number generation.
It is very common to use seed based on the tick counter and then rand() function which is "just" a constant fixed known function.
However, if after each reset, application…
Can the DAP cause exceptions by performing illegal instruction in spaces protected by MPU or is it immune?
Trying my hand at setting up MPU but I cannot get it to fire - thought it might not be possible with DAP.
Thanks, Tom
Hi,
I have configured my M4 based CC3200 from TI to output printf via ITM (all uarts used). Works great as long as the debugger is connected. But when I boot up with no debugger it streams out unrecognisable packets. The normal packets are one header…
for Cortex-M0, M3 and M4, I can find the execution time in their Technical Reference Manual > Programmers Model > Instruction set summary 里面查看
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0432c/CHDCICDF.html
but for M7 It said that…
Hello,
As part of my diagnostic regime I wanted the diag to halt when completed. It doesn't seem like it can. It seems to keep running when I
CoreDebug->DHCSR = (0xA05FUL << CoreDebug_DHCSR_DBGKEY_Pos) | CoreDebug_DHCSR_C_HALT_Msk…
Hi Sir,
may be the title of this question looks fun, but i am eagerly waiting for your next book "The Definitive Guide to Cortex M7" are you working on this book?? When could i Expect this book
Thanks and Regards,
Harshan.
Hello to all,
I would like to measure the current variation due to Functional Unit activation and deactivation. Can anyone help me out with the assembly program or the code through which I can measure this? I am using LPCXpresso 54114 board(ARM Cortex…
Hello to all,
I am trying to figure out the variation in current consumption as well as in clock cycles due to different memory regions and different offsets. During various experiments, I have found the following results:
LDR R4,[R1,#0x0] (R1 = 0x00000000…
Hello to all,
In order to measure the current variation due to instruction address location. I filled the memory with NOP instructions and tried to observe the variation in the current consumption due to change in the instruction address, although the…
Hello to all,
While working on different assembly instructions, I have come across a very different problem of the register's place. For example:
SBC r11,r7,r11 : 3.0217mAmps
but
SBC r11,r7,r7 : 2.7477mAmps
Similarly, for ORN and MVN also.
For all…
Dear all,
could you please tell me if it is possible to interface a Cortex M4 (3.3V) with a PSRAM (1.8V) directly or do I have to add a logic level (Voltage Translation) between both?
With kind regards,
David
Using ARM coretx-M chip set
Getting random INVPC hard fault exception error, while running iperf tool for measuring n/w throughput.
Hard fault reg: 0x40000000
xPSR: 0x01000000
PRIMASK: 0x00000001
CONTROL: 0x00000000
Please help to find the possible root…
Hi,
we are operating the M4F with 160MHz and we would like the know the MFLOPS we can achieve with this configuration.
Regards,
Timm
Hello,
I need help with heap initialization using scatter file and C++ startup.
MCU is STM32F407VGT6 (Cortex-M4).
Compiler is ARM Compiler 6.7, C++14.
The problem is that all variables which I create dinamically on the heap have wrong addresses. My HEAP…
Hello,
I need to change the Vector Table but I need it to be persistent through a reset, what I'm trying to do is set a vector table duplicate as a safety measurement for reprogramming the original vector table.
So far I being playing with the VTOR…
Hi guys, I am interested in exploring a scenario when Cortex M4 cpu performs a 16-bit static memory read when 32-bit memory is actually on the board.
The 16-bit memory chip is connected to lower half of the data bus, signals D0..D15 and there are two…
I have been reading through the ARM documentation on memory and instruction barriers.
I have read that the single core ARMv7-M parts do not reorder instructions, as such the DSB and ISB are not needed, is this correct?
I have also read the same about…
I'm looking for information on the typical max frequency (or typical frequency range) for the Cortex-M cores, in 40nm. Is there any documentation on that? Thanks.
Hi
Related to ARMv7-M architecture:
I am searching through all infocenter documents but still cannot find anything and answer this question: "When an exception is taken into account?" I mean, are exceptions only serviced after the current instruction…
Hello everyone,
I need to measure sleep time of my Cortex-M4 processor (STM32F4xx).
I looked at DWT where I also use normal tick counter and I enabled SLEEPCNT counter.
However, I noticed that it is 8-bit register with event generation support.
Now, there…
Hi,
We are currently working with Cortex M4 processor and previously we worked with Cortex R5 processor. As part of our project requirement, we need to detect "prefetch abort" exception and to identify the corresponding address. In Cortex R5, we are taking…
As part of fault detection / debugging, it's useful to have a panic() function that halts the processor.
It is easy enough to disable interrupts and put the processor in an infinite busy loop (while (1)). However, that burns power, and I am looking…
Hello,
I use DWT in Cortex-M4 to catch instructions that write or read memory contents and the problem is it doesn't stop immediately where I expect, it stops after 2-3 instruction later than where it should and the contents of registers are overwritten…