PSoC™ 4 Forum Discussions

Hi All

 I found the NAK Signal During the write frame.

I have attached the logic analyzer observation result for the same.

Master Device:- PIC Controller 

Slave Device :- Cy8C4025AZI-S413 

My Slave Address is 0x08 

Ideally After Address byte their should be ACK From Slave but  I observed NAK Signal.

I am not getting where is the exact mistake?

Any help will be highly appreciated.

Regards,

AsDh

Please Find the below Code for reference..

#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 (0u != (I2CS_I2CSlaveStatus() & I2CS_I2C_SSTAT_RD_CMPLT))
        {
            /* Clear the slave read buffer and status */
            I2CS_I2CSlaveClearReadBuf();
            (void) I2CS_I2CSlaveClearReadStatus();
        }
		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)) )
			{
                POWER_LED_Write(0);
				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; 

			}
            CapSense_ScanAllWidgets();
		}

	}

}

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;

	}

}

/* [] END OF FILE */