This is a project to replace the 8051 on a existing RGB LED board and add USB functionality. The original board relied on 8051 firmware to control the LEDs so any changes required software development. This version provides a USB interface for LED control. The USB interface is implemented as a HID with a 9 byte OutReport. In conjunction with a simple GUI the RGB LED board can now be controlled to set color patterns, intensity and pattern sequencing.

Dependencies:   PCA9635-6 mbed USBDevice

RGB GUI - Windows program to control the PCA9635 board.

/media/uploads/JimCarver/rgb_led.jpg

main.cpp

Committer:
user3736966508731826368
Date:
2011-12-09
Revision:
0:5e18eb7da208
Child:
1:ee2692588275

File content as of revision 0:5e18eb7da208:

#include "mbed.h"
#include "i2cmessages.h"
#include "USBHID.h"

//We declare a USBHID device. By default input and output reports are 64 bytes long.
USBHID hid( 9, 1, 0x1Fc9, 0x0003, 0x0100, 1);

//This report will contain data to be sent
HID_REPORT send_report;
HID_REPORT recv_report;

Serial pc(USBTX, USBRX);

DigitalOut myled1(LED1);
DigitalOut myled2(LED2);
DigitalOut myled3(LED3);
DigitalOut myled4(LED4);
DigitalOut led_en(p8);
DigitalIn SW6(p11);
DigitalIn SW5(p30);

I2C i2c(p28, p27);

Timer ms_timer;

AnalogIn ain(p20);
 
/***************************************************************************
NAME OF MODULE:        MAIN.C                                          
DESCRIPTION:            Main file for the LED String Demoboard                  
                                                                         
(C) Copyright 2008 NXP Semiconductors               
                                                                         
****************************************************************************/
BYTE dflag, tflag;

BYTE Buffer1[18];
BYTE Buffer2[18];
BYTE Buffer3[18];
BYTE Buffer4[18];
BYTE Buffer5[18];
BYTE Buffer6[18];

I2C_MESSAGE    I2C_Message;
int dval;

typedef struct {
    uint32_t    LED;
    uint8_t        RED, GREEN, BLUE, INTENSITY;
    } LED_Report_type ;

volatile LED_Report_type *LED_Report;


typedef struct {
// Definition for a LED location, buffer pointer, and index into that buffer
    BYTE *buf, n;
    } LED_type;
    
typedef struct {
    LED_type    RED;
    LED_type    GREEN;
    LED_type    BLUE;
    } RGB_type;

typedef struct {
    uint8_t r, g, b;
    } RB_type;

RB_type Rainbow[] = {
    255,   0,   0,
    255,  23,   0,
    255,  64,   0,
    255, 127,   0,
    255, 193,   0,
    255, 255,   0,
    193, 255,   0,
    127, 255,   0,
    127, 255,   0,
     63, 255,   0,
      0, 255,   0,
      0, 255,   7,
      0, 255,  15,
      0, 255,  31,
      0, 255,  63,
      0, 255,  91,
      0, 255, 127,
      0, 255, 193,
      0, 255, 255,
      0, 193, 255,
      0, 127, 255,
      0,  63, 255,
      0,   0, 255,
     31,   0, 255,
     63,   0, 255,
    127,   0, 255,
    193,   0, 255,
    255,   0, 255,
    255,   0, 193,
    255,   0, 127,
    255,   0,  63,
    255,   0,  15
    };

// An array of structures that define the buffer and location in the buffer for all of the LEDs
// Due to the design of the RGB LED board this is easier than the convoluted calculation needed
//    
RGB_type RGB_LED[32] = {
//  RED             GREEN           BLUE
//  LED1-16
    Buffer1, 2,     Buffer1, 3,     Buffer1, 4,
    Buffer1, 5,     Buffer1, 6,     Buffer1, 7,
    Buffer1, 8,     Buffer1, 9,     Buffer1, 10,
    Buffer1, 11,    Buffer1, 12,    Buffer1, 13,
    Buffer1, 14,    Buffer1, 15,    Buffer1, 16,
    Buffer1, 17,    Buffer3, 2,     Buffer3, 3,
    Buffer3, 4,     Buffer3, 5,     Buffer3, 6,
    Buffer3, 7,     Buffer3, 8,     Buffer3, 9,
    Buffer3, 10,    Buffer3, 11,    Buffer3, 12,
    Buffer3, 13,    Buffer3, 14,    Buffer3, 15,
    Buffer3, 16,    Buffer3, 17,    Buffer5, 2,
    Buffer5, 3,     Buffer5, 4,     Buffer5, 5,
    Buffer5, 6,     Buffer5, 7,     Buffer5, 8,
    Buffer5, 9,     Buffer5, 10,    Buffer5, 11,
    Buffer5, 12,    Buffer5, 13,    Buffer5, 14,
    Buffer5, 15,    Buffer5, 16,    Buffer5, 17,

//  LED17-32    
    Buffer2, 2,     Buffer2, 3,     Buffer2, 4,
    Buffer2, 5,     Buffer2, 6,     Buffer2, 7,
    Buffer2, 8,     Buffer2, 9,     Buffer2, 10,
    Buffer2, 11,    Buffer2, 12,    Buffer2, 13,
    Buffer2, 14,    Buffer2, 15,    Buffer2, 16,
    Buffer2, 17,    Buffer4, 2,     Buffer4, 3,
    Buffer4, 4,     Buffer4, 5,     Buffer4, 6,
    Buffer4, 7,     Buffer4, 8,     Buffer4, 9,
    Buffer4, 10,    Buffer4, 11,    Buffer4, 12,
    Buffer4, 13,    Buffer4, 14,    Buffer4, 15,
    Buffer4, 16,    Buffer4, 17,    Buffer6, 2,
    Buffer6, 3,     Buffer6, 4,     Buffer6, 5,
    Buffer6, 6,     Buffer6, 7,     Buffer6, 8,
    Buffer6, 9,     Buffer6, 10,    Buffer6, 11,
    Buffer6, 12,    Buffer6, 13,    Buffer6, 14,
    Buffer6, 15,    Buffer6, 16,    Buffer6, 17  };

//
// Lookup the buffer and index to set the desired values
// in the appropriate locations within the I2C message buffers
// update_LED() actually sends the buffers through I2C to the drivers
//
void set_LED(int LEDn, BYTE R, BYTE G, BYTE B)
{
    RGB_LED[LEDn].RED.buf[RGB_LED[LEDn].RED.n] = R;
    RGB_LED[LEDn].GREEN.buf[RGB_LED[LEDn].GREEN.n] = G;
    RGB_LED[LEDn].BLUE.buf[RGB_LED[LEDn].BLUE.n] = B;
}

void set_my_LED(int c)
{
    if(c & 1) {       myled4 = 1;       } else {       myled4 = 0;       }
    if(c & 2) {       myled3 = 1;       } else {       myled3 = 0;       }
    if(c & 4) {       myled2 = 1;       } else {       myled2 = 0;       }
    if(c & 8) {       myled1 = 1;       } else {       myled1 = 0;       }
}

/***********************************************************************
DESCRIPTION:    Initalization of the buffers (Buffer1, buffer2, Buffer3)
INPUT(S):        None
RETURNS:            Nothing
************************************************************************/
void Init_Buffers(void)
{
    int i = 0;
    for (i = 0; i<18; i++)
    {
        Buffer1[i] = 0;
        Buffer2[i] = 0;
        Buffer3[i] = 0;
        Buffer4[i] = 0;
        Buffer5[i] = 0;
        Buffer6[i] = 0;
    }
        
    Buffer1[0]    = 17;
    Buffer2[0]    = 17;
    Buffer3[0]    = 17;
    Buffer4[0]    = 17;
    Buffer5[0]    = 17;
    Buffer6[0]    = 17;
    Buffer1[1]    = 0x82;
    Buffer2[1]    = 0x82;
    Buffer3[1]    = 0x82;
    Buffer4[1]    = 0x82;
    Buffer5[1]    = 0x82;
    Buffer6[1]    = 0x82;
}


/***********************************************************************
DESCRIPTION:    Fill all the PWM register of a device with a RGB setting
INPUT(S):        A,B,C --> Primary colors
RETURNS:            Nothing
************************************************************************/
void Set_Same_Color_Single_Device(BYTE A, BYTE B, BYTE C)
{
    int i;
    Buffer1[0]    = 17;
    Buffer1[1]    = 0x82;
    for (i = 0; i < 5; i++)
    {
        Buffer1[3*i+2] = A;
        Buffer1[3*i+3] = B;
        Buffer1[3*i+4] = C;
    }
    Buffer1[17] = A;
}


void delay(int dd)
{
ms_timer.reset();
ms_timer.start();
while(ms_timer.read_ms() <= (dd));
ms_timer.stop();
}

void i2cfail(void)
{
int c = 0;
while(1) {
    set_my_LED(c++);
    delay(50);
    }
}

void I2C_Write(I2C_MESSAGE *mp)
{
if(i2c.write(mp->address, (char *) &mp->buf[1], mp->buf[0])) i2cfail();
}

/***********************************************************************
DESCRIPTION:    Set the I2C address to the ALL CALL Address and
                    send the I2C_Write command
INPUT(S):        None
RETURNS:            Nothing
************************************************************************/
void Write_All_Devices(void)
{
    I2C_Message.address         = ALL_CALL_I2C_ADDRESS;
    I2C_Write(&I2C_Message);
}


/***********************************************************************
DESCRIPTION:    Set the I2C address to the required address and
                    send the I2C_Write command
INPUT(S):        I2C Address of the targetted device (LSB = 0)
RETURNS:            Nothing
************************************************************************/
void Write_To_Device(BYTE I2C_Address)
{
    I2C_Message.address         = I2C_Address;
    I2C_Write(&I2C_Message);
}


/***********************************************************************
DESCRIPTION:    Set the I2C address to the required address and
                    send the I2C_Write command
                    Wait (delay) before moving to the next step
INPUT(S):        I2C Address of the targetted device (LSB = 0)
                    Delay = delay in ms / 10
RETURNS:            Nothing
************************************************************************/
void Write_To_Device_And_Wait(BYTE I2C_Address, BYTE Delay_Value)
{
    I2C_Message.address         = I2C_Address;
    I2C_Write(&I2C_Message);
    delay(Delay_Value);
}


/***********************************************************************
DESCRIPTION:    Swtich of ALL the LEDs using the ALL CALL address
INPUT(S):        None
RETURNS:            Nothing
************************************************************************/
void ALL_LED_OFF(void)        // Switch off all the LEDs
{
    I2C_Message.buf             = LED_ALL_OFF; 
    Write_All_Devices();
}


void LED_INTENSITY(void)
{
    //GLOBAL_INTENSITY[2] = global_i;
    I2C_Message.buf = GLOBAL_INTENSITY;
    Write_All_Devices();
}


void update_LED(void)
{
  I2C_Message.buf = Buffer1;
  Write_To_Device(0x80);
  I2C_Message.buf = Buffer2;
  Write_To_Device(0x86);
  I2C_Message.buf = Buffer3;
  Write_To_Device(0x82);
  I2C_Message.buf = Buffer4;
  Write_To_Device(0x88);
  I2C_Message.buf = Buffer5;
  Write_To_Device(0x84);
  I2C_Message.buf = Buffer6;
  Write_To_Device(0x8A);
}

void read_LED( int LEDn, BYTE *R, BYTE *G, BYTE *B)
{
    *R = RGB_LED[LEDn].RED.buf[RGB_LED[LEDn].RED.n];
    *G = RGB_LED[LEDn].GREEN.buf[RGB_LED[LEDn].GREEN.n];
    *B = RGB_LED[LEDn].BLUE.buf[RGB_LED[LEDn].BLUE.n];
}

void rainbow_LED( void)
{
int i;
    for(i=0;i<32;i++) set_LED( i, Rainbow[i].r, Rainbow[i].g, Rainbow[i].b );
}

void ripple_LED( void )
{
uint32_t  m;
uint8_t LEDn, R, G, B, tR, tG, tB;
if( dflag) {   // Ripple LEDs to the right
    read_LED( 0, &tR, &tG, &tB);    // Save the first LED value
    for(LEDn = 0 , m = 1; LEDn < 31; LEDn++) {
       read_LED( LEDn+1, &R, &G, &B);
       set_LED(  LEDn, R, G, B); 
        m = m << 1;
        }
    set_LED(  31, tR, tG, tB);
    } else {  // Ripple LEDs to the left
    read_LED( 31, &tR, &tG, &tB);
    for(LEDn = 31, m = 0x80000000 ; LEDn > 0; LEDn--) {
       read_LED( LEDn - 1, &R, &G, &B);
       set_LED(  LEDn, R, G, B);
        m = m >> 1;
        }
    set_LED(  0, tR, tG, tB);
    }
}    
        
        
void test_pattern(void)
{
int l, r, g, b;
// Dim Blue Color (from min to max)
Init_Buffers();
set_my_LED(1);
for (r = 0, g = 0, b = 0; b < 0xFF; b++) {
    for(l = 0; l < 32; l++) {
        set_LED( l, r, g, b);
        }              
    update_LED();    
    }
set_my_LED(2);
// Mix from Only Blue (Max going to off) to Only Green (off to Max) 
for (r = 0, g = 0, b = 0xFF; b >= 0x00; b--) {
    for(l = 0;l < 32; l++) {
       set_LED( l, r, g, b);
       }
    update_LED();          
    g++;                  
    }        
set_my_LED(4);
// Mix from Only Green (Max going to off) to Only Red (off to Max) 
for (r = 0, g = 0xFF, b = 0; g >= 0x00; g--)  {
    for (l = 0;l < 32; l++) {
        set_LED( l, r, g, b);
        }
    update_LED();
    r++;                
    }
set_my_LED(8);
// Mix from Only Red (Max going to off) to Only Blue (off to Max) 
for (r = 0xFF, g = 0, b = 0; r >= 0x00; r--) {
    for (l = 0;l < 32; l++) {
        set_LED( l, r, g, b);
        }
    update_LED();
    b++;
    }
set_my_LED(0);
rainbow_LED();
update_LED();  
}

void SetOutReport (void)
{
int LEDn;
uint32_t    led, m;
uint8_t        R, G, B, seq;

    /* Check the bits of the "OutReport" data from the PC
     * and set the output port status. */
seq = recv_report.data[0];
//LED_Report = (LED_Report_type *) &recv_report.data[1];
GLOBAL_INTENSITY[2] = recv_report.data[8];
if(seq) {
    tflag = 2;
    dflag = seq & 1;
    dval = (seq & 0xFC) >> 1; // sets a range from 0x00 to 0x7E
    } else {
    led = recv_report.data[4];
    led <<= 8;
    led |= recv_report.data[3];
    led <<= 8;
    led |= recv_report.data[2];
    led <<= 8;
    led |= recv_report.data[1];
    
    set_my_LED(led & 0xf);
    R = recv_report.data[5];
    G = recv_report.data[6];
    B = recv_report.data[7];
    for(LEDn=0, m=1;LEDn < 32; LEDn++, m <<= 1) {
        if(led & m) {
            RGB_LED[LEDn].RED.buf[RGB_LED[LEDn].RED.n] = R;
            RGB_LED[LEDn].GREEN.buf[RGB_LED[LEDn].GREEN.n] = G;
            RGB_LED[LEDn].BLUE.buf[RGB_LED[LEDn].BLUE.n] = B;
            }
        }
    tflag = 1;
    }
}






/***********************************************************************
DESCRIPTION:    Main function
INPUT(S):        None
RETURNS:            Nothing
************************************************************************/
int main (void)
{
int l = 1;
led_en = 0;
set_my_LED(1);
// Perform Software Reset - Set the PCA9635 in a known state
I2C_Message.buf = SW_RESET; 
Write_To_Device(SW_RESET_I2C_ADDRESS);

// Wake up and Init the PCA9635 using ALL CALL address
I2C_Message.buf             = WAKE_UP_AND_INIT; 
Write_All_Devices();
Init_Buffers();

// Program all LED outputs to Individual PWM + Global PWM using ALL CALL address
I2C_Message.buf = LED_ALL_INDVDL_PLUS_GLOBL_PWM_CTRL;
Write_All_Devices();
if(!SW6) test_pattern(); 
dflag = 0;
dval = 10;
tflag = 0;
set_my_LED(l++);
send_report.length = 1;
while (1) {
      send_report.data[0] = SW5;
      hid.send(&send_report);
      if(hid.readNB(&recv_report)) SetOutReport();
      if(tflag == 2) {
          ripple_LED();
          update_LED();
          LED_INTENSITY();
          delay(dval);
          }
        
      if(tflag == 1) {
          update_LED();
          LED_INTENSITY();
          tflag = 0;
          }
    }
}