Legacy microcontrollers Forum Discussions

Hello. This is my first time using an ARM MPU having trouble from past 2 weeks trying to figure out why there is higher than normal interrupt latency and about 125+ns of cycle time for a Nop.

https://www.infineon.com/dgdl/Infineon-S6E1A_Series_32_bit_Arm_Cortex_M0+_FM0+_Microcontroller-DataSheet-v05_00-EN.pdf?fileId=8ac78c8c7d0d8da4017d0edad5f45d7a&utm_source=cypress&utm_medium=referral&utm_campaign=202110_globe_en_all_integration-datasheet

Using a cypress arm M0+ for which the datasheet is above. Running the CPU at 40Mhz using an external oscillator which should give a cycle time of 25ns. Verified the prescaler values and also verified the clock by generating a PWM of 5Khz using the formula they provide. Everything checks out. But when i run the following code they dealy for one NOPs measured to be about 125ns. I know there is a latency for the I/O but comparing the timing for toggling the I/O without a NOP and with one i get the time for it. 

 FGpio1pin_Put(GPIO1PIN_P21, 0u);
  __ASM volatile ("NOP");
 FGpio1pin_Put(GPIO1PIN_P21, 1u);
  __ASM volatile ("NOP");
 FGpio1pin_Put(GPIO1PIN_P21, 0u);
  __ASM volatile ("NOP");
 FGpio1pin_Put(GPIO1PIN_P21, 1u);
  __ASM volatile ("NOP");
 FGpio1pin_Put...

Code

I have also tried using a loop to generate busy waits using NOPs over a longer duration and got the same result. 

Is this something to do with ARM? I checked the clock prescalers and generated a PWM everything checks out. When i try to do busy waits the cycle time is no where near 25ns. Moreover the interrupt latency is 3ms at best for NMI and 4-6us for GPIO interrupts. From the datasheet the interrupt should be in 500ns. Also from the datasheet this particular MPU has zero wait states.

The code is bare bones main loop using the PDL library cypress provides.

I know these are two different problems or maybe not but I am trying to understand why a NOP which should take a cycle to complete, at 40Mhz it is behaving as though it is running at 8Mhz. Reducing the clock prescalers does increase the cycle time of NOPs.

How do I verify clock in Arm M0+ other than what i have tried with PWM and NOPs ? Any pointers will be appreciated.

I am starting to work with  this board but I am confused what software I need to use? Youtube had a video made it simple but it  did not state what I need for IDE.

FM4-176L-S6E2CC-ETH

philipnielsen902@gmail.com

Is there an upper limit for the supply voltage in the constant current output mode of TLE7242? When my external load resistance changes, if the supply voltage exceeds the load resistance value multiplied by the maximum current output range, the output current cannot be accurately maintained at my set output current. For example, when the external load is 10Ω and the output current is set to 1000mA, if the supply voltage is less than 20V, the output current can always maintain 1000mA. When the supply voltage is greater than 20V, the output current will gradually start from 1000mA as the supply voltage increases. During this period, even if the output current value in the circuit is less than the maximum range, the feedback current value of TLE7242 is still 1000mA.

The maximum current output range is 2000mA when all 11 bits of setpoint are 1 and Rsense is 0.16Ω,the external load resistance is 10Ω.

When I assign a value of 1024 to setpoint,TLE7242 should maintain an output current of 1000mA,But it can be stabilized at 980mA when it is below 20V, and it will gradually increase when it is above 20V. When the supply voltage is 29V, the output current becomes 1300mA.

When I change the load resistance, the maximum supply voltage when the TL7242 can stably regulate the output current will also change.

Hi, could somebody point me into right direction.

Need MCU Flasher to write those three legacy chips:

MB90F022, MB90F025, MB90F037

I managed to read all three with the 3-rd party tool, but that tool cannot write, only read.

I downloaded and installed various Flashers from those links below - but there is no choice for those three chips.

Unless somebody could advise which other compatible chip could be selected to write those three as above. TIA

https://www.cypress.com/documentation/software-and-drivers/flash-mcu-programmer-1

https://www.cypress.com/documentation/software-and-drivers/flash-usb-programmer-0

https://www.cypress.com/documentation/software-and-drivers/flash-usb-programmer-new-8fx

https://www.cypress.com/documentation/software-and-drivers/flash-usb-direct-programmer-1

https://www.cypress.com/documentation/software-and-drivers/pc-helperstandalone-programmer

Hi,

One of our customer is facing an EOL problem with CY96F348RW (LQFP100).

Although they have the datasheet of CY96F348RWCPMC-G-UJE2,

they can not find the datasheet for that device (CY96F348RW).

Now our question is

What is the difference between

CY96F348RW  and CY96F348RWCPMC-G-UJE2 

Would someone please teach us the answer?

moto

I would need some information about the planned lifecycle of the Fujitsu FR60 family, and the Softune toolchain.

I am aware that this (a public forum) is not the place to discuss such things openly.

So, can somebody point me to a place where/whom to ask ?

Thank you !

Hi Team, 

   I am  working on CAN with evaluation board SK-FM4-216-ETHERNET. 

   Could you please share CAN(0,1) 11 bit Identifier, loopback test code and CAN(0,1) module test code with/without  IRQ. 

   Default driver code to test can with UART is not able to transmit and receive data, IRQ is not working.

   Any jumper setting is required to, for CAN 0 and CAN 1 . Please kindly guide me as soon as possible.

   Please kindly share working sample code with guidelines as soon as possible.

Thanks,

Baahubali