PSoC™ 4 Forum Discussions

I working to send a simple Int between two BLE devices. I've been able to run the UART example in which one device is setup as a central and the other as peripheral. All works well there. This allows you to type in a serial window and it sends it to the other device. 

What I'm trying to do now is a simple Int programmatically between the two devices. I am able to get the data back and forth however it always comes out weird on the device that I'm sending it to. 

Here is how I send a piece of data from my peripheral device: 

void Send_Event_Code_To_Sensor(int eventCode)
{
    CYBLE_API_RESULT_T              bleApiResult;
    CYBLE_GATTS_HANDLE_VALUE_NTF_T     tempHandle5;
   
    tempHandle5.attrHandle = CYBLE_SERVER_UART_SERVER_UART_TX_DATA_CHAR_HANDLE;
    tempHandle5.value.val = (uint8*)eventCode;
    tempHandle5.value.len = sizeof(eventCode); 
    
     do
     {
        bleApiResult = CyBle_GattsNotification(cyBle_connHandle, &tempHandle5);
        CyBle_ProcessEvents();
     }
     while((CYBLE_ERROR_OK != bleApiResult)  && (CYBLE_STATE_CONNECTED == cyBle_state));
}

Here is how I receive it on the central device: 

void HandleUartRxTraffic(CYBLE_GATTC_HANDLE_VALUE_NTF_PARAM_T *uartRxDataNotification)
{
    if(uartRxDataNotification->handleValPair.attrHandle == txCharHandle)
    {
        unsigned int paramVal = *uartRxDataNotification->handleValPair.value.val;
    }
}

The problem is that when I receive the data it's always something weird. 

For instance, if I try to send the number 1 from my peripheral like this: 

Send_Event_Code_To_Sensor(1);

It decodes as 64 on my central device. What am I doing wrong here? Is it because I'm sending it as a pointer here: 

tempHandle5.value.val = (uint8*)eventCode;

Maybe? 

I have the PSoC 4 BLE system connected via SPI to a device. That device has a "Who Am I" register at 0x0f that will reply with the value 0x6a if read correctly.

I have used a SCB dialog to create a SPI master, Sub mode: Motorola  CLK CPHA=1, CPOL=1

Data Rate: 1Mbps

Rx & Tx data bits 16

Transfer Separation: Separated

Rx & Tx Buffer Size: 8

No Interrupts

I have written the code to just query that register to prove that the SPI bus works. When the register is read correctly a LED connected to Pin 2 is turned on.

What I found was that I had to put a while loop to continuously read the SPI bus to get the correct value. In fact I had to read the bus 9 times first and then on the 10th time the value returned was correct.

Here is the code:

static uint8_t readTheRegByUart(uint8_t theRegAddr) {
  uint8_t theRegValue = 0;
  uint16_t theReadCmd = 0x8000;
  
  /* read the register */
  theReadCmd |= (uint16_t)((uint16_t)theRegAddr << 8);
  SPI_SpiUartWriteTxData(theReadCmd);
  
  while(SPI_SpiUartGetRxBufferSize() > 0) {
    theRegValue = (uint8_t) (SPI_SpiUartReadRxData() & 0x000000ff);
  }
  
  return theRegValue;
}

int main(void) {
  uint8_t theValue;
  
    CyGlobalIntEnable; /* Enable global interrupts. */
    SPI_Start();
    while((theValue = readTheRegByUart(0x0f)) != 0x6a);
    Pin_2_Write(0);

    for (;;)
    {
        ;
    }
}

Am I running into a buffering issue from the Rx FIFO in the SPI implementation? Is using the "Uart" version of the SPI code wrong?

Any insights would be helpful.

Cheers!!

Hello,

I basically want to achieve the following behavior using WDT0 timer but in this moment I face 2 problems.

Use case: Start the WDT0 for about 10 ms (327 for match value); When expire, set a pin on 1 and start the WDT for about 0.28 ms ( 9 in match value). When this expire start ADC conversion, wait for result, start WTD0 for about 0.04ms (1 in match value). When this last time expires set the pin on 0. So basically at each 10 ms I want to create a signal on 1 for about 0.32 ms, like a clock but I want it to run also in deep sleep mode.

First problem is when set a match value < than 5 the CPU resets itself. I do not know why but with 5 in match value it is working but obvious the time is more than the 0.04ms wanted.

Second problem is caused by the interrupt priority as I expect because when run whitout any other component the 0.28 ms time is ~0.24ms and the adc conversion takes 10 uS as expected. On the other hand, when I run my application which includes other components like I2C, BLE, ADC, WDT1, etc; the time is about 0.89 ms (instead of 0.32 ms). I expect that the interrupts from I2C, BLE and others comes in and therefore delays the interrupt for WDT0. I do not need exact times, but close. So it is ok to have lets say 20-30 us delays but not 3 times the expected time.

Therefore my questions are: how to set the WDT0 interrupt to the highest priority to make my pulse? And, of course, why I cannot set a value les than 5 on math register?

Other details: Before  start first the WDT0 I set this:

/* Setup WDT Counter 0 to generate interrupt on match */
    CySysWdtWriteMode(CY_SYS_WDT_COUNTER0,CY_SYS_WDT_MODE_INT);
    /* associate a callback to wdt interrupt */
    CySysWdtSetInterruptCallback(CY_SYS_WDT_COUNTER0, WDTCompareMatchCallback);

Then When I start the WDT I do :

 /* Write match count */
    CySysWdtWriteMatch(CY_SYS_WDT_COUNTER0, XXX); // XXX 327, 9, 1
    /* Enable clear of counter on match */
    CySysWdtWriteClearOnMatch(CY_SYS_WDT_COUNTER0, 1u);
     /* Enable WDT counter 0 */
    CySysWdtEnable(CY_SYS_WDT_COUNTER0_MASK); 

Every time I reload a match value I do

/* Stop timer */
    CySysWdtDisable(CY_SYS_WDT_COUNTER0_MASK);

Thank you!

Hi,

I want to create four HID joysticks and one receiver. Pressed buttons should be transferred at a maximum rate of 60 Hz (only if buttons are pressed). The minimum connection interval at BLE is 7.5 s and only one peripheral could be connected at the same time. It is possible to connect to more than one peripheral with time shifting.
What is the fastest switch rate? Is it possible to switch 4 times within 15 ms?
If not, would daisy chaining be a solution? The receiver would be the central, the first joystick a peripheral and the central for the next joystick. So every device only would have a maximum of two connections, but the lag could be too big (data of joystick 4 would have 4 connection switches).

Another question: How can I check if my HID joystick data is correct? All BLE parameters should be implemented correct if an external receiver would be used.

Thanks for your help.