PSoC™ 4 Forum Discussions

I have an application where I am trying to minimise current draw when waiting for an external trigger signal, but then need the PSOC to leap out of bed and set one of my GPIO pins high as quickly as possible - I'm talking sub 10usec after the trigger is received, if possible.

I'm putting my code into Hibernate and triggering it out of this mode with a GPIO interrupt.  But I'm coming up against a couple of issues:

1.  In the default start up code that PSOC Creator spews out (cyfitter_cfg.c), there are a number of delays (one of them is 500msec!!) slotted into the startup code to allow various clocks to settle.  So, if I leave the cyfitter_cfg.c as is, I've got no hope.  I'm seeing delays of 520msec or more between when the trigger occurs, and when my GPIO is set high.

2. In attempt to get around the above issue, I manually changed cyfitter_cfg.c so that the very first thing it does is write to one of my GPIO pins, but I think some other code needs to run beforehand, so that the appropriate GPIO is configured correctly (in my case as an output with Strong Drive).  This is where I read this: https://community.cypress.com/t5/Knowledge-Base-Articles/GPIO-State-during-Startup-in-PSoC-4-KBA227963/ta-p/249649

I read in the datasheet for the PSOC4 that the wakeup time for the PSOC4 to exit Hibernate mode is 3msec, but its not clear what this refers to, particularly given the fact that there is a 500msec thumb-twiddling delay inserted into the start up code by default.

Does anyone know a way I can get my GPIO pin set up and write a "1" to it in the sort of time frame  I'm needing? (< 10usec after the trigger signal)

Cheers,

Mike

Hello,

I want to use the iDAC in the CYBLE-222014 and was wondering if the Vref supplies the iDAC. If so,

1) is it okay to supply Vref/iDAC with 5.5V and VDD/VDDR with 2.8V?

2) Also, is it okay to leave Vref disconnected when I am not using any analog blocks?

Hello,

in my application, I have a lithium battery.

the system is powered when USB is pluging in and a specific IC charge the battery?

the IC charger has two differents set up: 1:  limit the current at USB specifications (100 mA and 500mA after enumeration) and 2 :boost current more than 500mA (max 1800mA) when the USB cable is connect to a wall adapter.

I need to kown, when  this two different stage happen

_ when enumeration is ok and USB port can send 500mA

_when the USB cable is connect to a wall adapter.

is there fonctions in the API of the USBFS component that can handle that.

I like to use this device running an USB - HID profile. According datasheet Pin 13.1 (D-)  13.0(D+) and P13.2 VBUS (5V from USB?). Datasheet of USB tells me that I also have to assign VBUS to P0.0 ..(for 4200L devices). For me this is all not clear how to wire. It would be very great if your datasheet hold a schematics of all possible scenario.. how to connect. Pease assist !!

I like to run it as self powered, Not Bus powered. Please tell me the exact setting in USB configuration, and how to wire... what to connect where and how, Thanks.

Hello, Cypress supporters.

About PSoC4: CY8C4024LQS S411, I want to set Pin(UART Rx setting) to detect GPIO edge occurrence and wake up from Deep Sleep. However, according to "AN90799: PSoC® 4 Interrupts", it says:

2.1 Interrupt Sources

(1)There are pin limitations; not all ports have dedicated interrupts. If the UART selected pins do not have dedicated port interrupt, it cannot wake up the device. See the "Interrupts" chapter in device Architecture Technical Reference Manual (TRM) to learn about ports that have dedicated interrupts.

It says "If the UART selected pins do not have dedicated port interrupt,"　Which Pins can't wake up?
I looked at the relevant part of TRM, but I can't find the description.

Thank you for your support.

I am using the USB HID example from cypress. On the Cy8CKIT-059 (psoc5) it is running fine. I have to use CY8C4247AZI-L485 in a custom board.The system is self powered. I connected D+  D- and VUSB to the pins of the USB connector. I can programm but USB enumeration is not completed. The flow hangs in the while loop

int main(void)
{
uint16_t OUT_COUNT;
uint8_t* response;
CyGlobalIntEnable; /* Enable global interrupts. */

/* Place your initialization/startup code here (e.g. MyInst_Start()) */

/* Start USBFS operation with 5-V operation. */

USBFS_1_Start(USBFS_1_device,USBFS_1_5V_OPERATION); // USBFS_1_3V_OPERATION

while(USBFS_1_bGetConfiguration() == 0x00)
{
/* Waiting for device to be configured */
}

I also tried the 3V operation. I checked the USB configuration  and tried all options avaliable

also using P0.0 with a voltage divider connected in parallel to VUSB. What do I miss? How can I get  the device running?