PSoC 4 MCU

Hello.

Attached project uses 2 PWM components.

PWM makes square wave, and this square wave is stopped or started by PWM_Timer interrupt.

Attached pptx file is waveform of this square wave.

Sometimes it takes some time for voltage level to reach GND when square wave is stopped.

Please confirm red circle of attached pptx file.

Q1)

Could you please let us know reason why this behavior occurs?

Does this behavior occur if PWM is stopped when voltage level is high?

Why doesn't voltage level go to GND immediately?

Q2)

Could you please let us know solution to this behavior?

I want to immediately set voltage level to GND regardless of timing that PWM_stop is called.

Best Regards.

Yutaka Matsubara

Hi All,

I  tried to implement I2C communication between Cy8C4025AZI-S412( Slave ) and Pic Microcontroller(Master). The speed is 100kbps and used polling method. When button not pressed then it will sent 0xFF. The polling time is 100msec by PIC controller.

The issue is, 

1) Sometimes acknowledge not given by Slave.(need to sent data 3 to 4 times  or delay of 30ms  then it gives ack ).

I used one example code to develop I2C.

My code is below,

#include <project.h>

/* Macro Declaration */
#define BUFFER_SIZE (1u)
#define PACKET_SIZE (BUFFER_SIZE)

/* The I2C Slave read and write buffers */
uint8 i2cReadBuffer [BUFFER_SIZE] = {0};
uint8 i2cWriteBuffer[BUFFER_SIZE]= {0};

uint8_t flag1=0;

uint8_t flag3=0;

void Received_Data_From_Master1();

int main()
{

     /* Eneble Global Interrupt */

      CyGlobalIntEnable;

      CapSense_Start();
      CapSense_ScanAllWidgets();

     /* Start the I2C Slave And I2C Address Setting*/
     I2CS_I2CSlaveInitReadBuf(i2cReadBuffer, BUFFER_SIZE);
     I2CS_I2CSlaveInitWriteBuf(i2cWriteBuffer, BUFFER_SIZE);

       I2CS_I2CSlaveSetAddress(0x08);
       I2CS_Start();

for (;;)
{
    CyDelay(2);
   /* With Respect to Master i.e Checked Whether the Master Write Complted Or Not */
    if (0u != (I2CS_I2CSlaveStatus() & I2CS_I2C_SSTAT_WR_CMPLT))
{
          /* Calling Function to Collect The Data From Master */
          Received_Data_From_Master1();
          /* Enable this above function when we used the data On Switch Function */

            /* Clear the slave write buffer and status */
            I2CS_I2CSlaveClearWriteBuf();
            (void) I2CS_I2CSlaveClearWriteStatus();
}

if(CapSense_NOT_BUSY == CapSense_IsBusy())
{
      /* API For Capsense Update Scanning And Process */
      CapSense_ProcessAllWidgets();           /* Process all widgets */
      CapSense_RunTuner();                            /* To sync with Tuner application */
      /* Checked whether Left Button Active or Not*/
if((flag3==0)&&(CapSense_IsWidgetActive(CapSense_BUTTON2_WDGT_ID)) )
{
      flag3=1;              /* Reseting Left Button Flag */
      i2cReadBuffer[0] = 0x01;
      while (I2CS_I2C_SSTAT_RD_CMPLT!=(I2CS_I2CSlaveStatus()));
      /* Clear the slave read buffer and status */
       I2CS_I2CSlaveClearReadBuf();
      (void) I2CS_I2CSlaveClearReadStatus();
      i2cReadBuffer[0] = 0xFF;
}
else if((flag3==1) && (!(CapSense_IsWidgetActive(CapSense_BUTTON2_WDGT_ID))))
{
       flag3=0; /* Setting Left Button Flag */
       i2cReadBuffer[0] = 0xFF;
}


/* Checking Right Button active or not */
if((flag1==0)&&(CapSense_IsWidgetActive(CapSense_BUTTON0_WDGT_ID)))
{
        flag1=1; /* Reseting the flag*/
         i2cReadBuffer[0] = 0x06;
         while (I2CS_I2C_SSTAT_RD_CMPLT!=(I2CS_I2CSlaveStatus()));
        /* Clear the slave read buffer and status */
        I2CS_I2CSlaveClearReadBuf();
        ( void) I2CS_I2CSlaveClearReadStatus();
         i2cReadBuffer[0] = 0xFF;
}
else if((flag1==1)&& (!(CapSense_IsWidgetActive(CapSense_BUTTON0_WDGT_ID))))
{

          flag1=0; 

}
}

}

}

void Received_Data_From_Master1()
{
switch(i2cWriteBuffer[0])
{
  /* After Receiving 00 touch will be Ready to Work */
  case 0x00:
         i2cReadBuffer[0] = 0x19; /*According to New Document Wants to transmit new data acknowledgement */
         POWER_LED_Write(0);
          break;

}

}

Any Help will be highly appreciated .

Thanks & Regards,

AsDh

Hello, 
I have two Cy8C-042 Evaluation boards. I want to synchronize them. 
They shared two GPIOs over optocouplers. 1 is the output of 1 and input of other and other ist input of 1 and output of other. 
There is a test I have to perform for 10ms.  for 1ms microcontroller but i cannot be able to synchronize them 100 percent.
at the start of the test, they are almost synchronized but later at the end of test they have a difference of around 200 to 300 uS. 
Can somebody help me to figure out the problem?

In my application Psoc4 has to serve a device that could be configured  in SPI or parallel mode during runtime. In SPI mode pin named D0 has to be configured as MTSR, D1 has to be configured as SS,  D2 has to be configured as SCLK and  D3 has to be configured as MRST. In parallel mode  D0...D3 are part of the parallel IO (D0...D7) offering bidirectional IO. How to implement this switch on the fly?

I've been learning how to use PSoC by the tutorial vids. In lesson 4 I encountered a problem, when it came to the hardware connection between the switch and the LED.

The error is: "Pin guidance unavailable. Pin cannot be placed at X. Pin cannot be used for routed connections." for both the input and the output pin as soon as i connect them by wire in my TopDesign.

The goal would be to directly turn on the LED by pressing the switch as described in the tutorial.

Is this a configuration problem or is my board not able to do hardware connections (which I doubt).

I'm using PSoC Creator 4.4 and the CY8CKIT-149 PSoC 4100S Plus Prototyping Kit, CY8C4147AZI-S47564.

I attached the project.

I'd be very grateful for an explanation of this error and even more for a solution.

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

I set an EEPROM section at 0x4E00 in Bootloader.And I want to read and write  EEPROM at same address(0x4E00)in bootloaderable.The start address of bootloaderable is 0x6000.If I define the same address ,it shows that  wrong image  overlaps section .