Controlling Brightness of LED on FM4 Using PSoC4 Capsense

/*****************************************************************************
* File Name: main.c
*
* Version: 1.10
*
* Description:  This example code demonstrates the PSoC4 CapSense Linear Slider
* operation.
*
* Related Document: Code example CE210289.pdf 
*
* Hardware Dependency: See code example CE210289
*
******************************************************************************
* Copyright (2016), Cypress Semiconductor Corporation.
******************************************************************************
* This software is owned by Cypress Semiconductor Corporation (Cypress) and is
* protected by and subject to worldwide patent protection (United States and
* foreign), United States copyright laws and international treaty provisions.
* Cypress hereby grants to licensee a personal, non-exclusive, non-transferable
* license to copy, use, modify, create derivative works of, and compile the
* Cypress Source Code and derivative works for the sole purpose of creating
* custom software in support of licensee product to be used only in conjunction
* with a Cypress integrated circuit as specified in the applicable agreement.
* Any reproduction, modification, translation, compilation, or representation of
* this software except as specified above is prohibited without the express
* written permission of Cypress.
*
* Disclaimer: CYPRESS MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH
* REGARD TO THIS MATERIAL, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
* Cypress reserves the right to make changes without further notice to the
* materials described herein. Cypress does not assume any liability arising out
* of the application or use of any product or circuit described herein. Cypress
* does not authorize its products for use as critical components in life-support
* systems where a malfunction or failure may reasonably be expected to result in
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* support systems application implies that the manufacturer assumes all risk of
* such use and in doing so indemnifies Cypress against all charges. Use may be
* limited by and subject to the applicable Cypress software license agreement.
*****************************************************************************/

#include "project.h"
#include "main.h"


volatile uint8 Slider_pos=0;

/*******************************************************************************
* Function Name: main
********************************************************************************
*
* Summary:
*  main() performs the following functions:
*  1. Initializes CapSense and SCB blocks
*  2. Scans & processes slider sensors
*
*******************************************************************************/
int main ()
{    
    
    
    /* Enable Global interrupts for CapSense operation */
    CyGlobalIntEnable;
    
    I2CM_Start();
    /* Start CapSense block - Initializes CapSense Data structure and 
    performs first scan to set up sensor baselines */
    CapSense_Start();
    
    /* Scan all widgets */
    CapSense_ScanAllWidgets();
    
    for(;;)
    {
        /* Do this only when a scan is done */
        if(CapSense_NOT_BUSY == CapSense_IsBusy())
        {
              /* Process all widgets */
              CapSense_ProcessAllWidgets();
              /* Include Tuner */ 
              CapSense_RunTuner(); 
              /* Scan result verification */
              if (CapSense_IsAnyWidgetActive())
              {
                   /* Add any required functionality
                      based on scanning result*/
                Slider_pos= CapSense_GetCentroidPos(CapSense_LINEARSLIDER0_WDGT_ID);
                WriteCommandPacket(Slider_pos);
              }
              /* Start next scan */
            
              CapSense_ScanAllWidgets();
            
           
        }
        
        
    }
}

/*******************************************************************************
* Function Name: WriteCommandPacket
********************************************************************************
* Summary:
*  Master initiates the transfer to write command packet into the slave.
*  The status of the transfer is returned.
*
* Parameters:
*  cmd: command to execute. Available commands:
*   - CMD_SET_RED:   set red color of the LED.
*   - CMD_SET_GREEN: set green color of the LED.
*   - CMD_SET_BLUE:  set blue color of the LED.
*   - CMD_SET_OFF:   turn off the LED.
*
* Return:
*  Returns status of the transfer. There are two statuses
*  - TRANSFER_CMPLT: transfer completed successfully.
*  - TRANSFER_ERROR: the error occurred while transfer.
*
*******************************************************************************/
uint32 WriteCommandPacket(uint8 cmd)
{
    uint8  buffer[BUFFER_SIZE];
    uint32 status = TRANSFER_ERROR;

    /* Initialize buffer with packet */
    buffer[PACKET_SOP_POS] = PACKET_SOP;
    buffer[PACKET_CMD_POS] = cmd;
    buffer[PACKET_EOP_POS] = PACKET_EOP;

    (void) I2CM_I2CMasterWriteBuf(I2C_SLAVE_ADDR, buffer, PACKET_SIZE, \
                                  I2CM_I2C_MODE_COMPLETE_XFER);

    /* Waits until master completes write transfer */
    while (0u == (I2CM_I2CMasterStatus() & I2CM_I2C_MSTAT_WR_CMPLT))
    {
    }

    /* Displays transfer status */
    if (0u == (I2CM_I2C_MSTAT_ERR_XFER & I2CM_I2CMasterStatus()))
    {
        /* Check if all bytes was written */
        if (I2CM_I2CMasterGetWriteBufSize() == BUFFER_SIZE)
        {
            RGB_LED_ON_GREEN;
            status = TRANSFER_CMPLT;
        }
    }
    else
    {
        RGB_LED_ON_RED;
    }

    (void) I2CM_I2CMasterClearStatus();

    return (status);
}



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