InetrfaceProducts NXP / Mbed 2 deprecated PCA9955A_Hello

Hello world code for PCA9955A class library. The PCA9955A is a 16-channel Fm+ I2C-bus 57mA/20V constant current LED driver. This program shows its basic operation of PWM and current settings.

Dependencies:   mbed PCA995xA

Please refer to the component page for details

PCA9955B and PCA9956B are I²C-bus controlled 16-channel constant current LED driver optimized for dimming and blinking.

High-level API is available

A high-level API that can be used as the "PwmOut" of bed-SDK is available.
This API enables to make instances of each LED output pins and control PWM duty cycle by assignment.
Output current also controllable by API function.
For detail information, refer API document of LedPwmOutCC Class class which is included in PCA995xA class library.

#include "mbed.h"
#include "PCA9956A.h"

PCA9956A    led_cntlr( p28, p27, 0xC4 );  //  SDA, SCL, Slave_address(option)
LedPwmOutCC led( led_cntlr, L0 );

int main()
{
    while( 1 ) {
        for( float p = 0.0f; p < 1.0f; p += 0.1f ) {
            led     = p;
            wait( 0.1 );
        }
    }
}

Files at this revision

API Documentation at this revision

Revision 6:9abd0b582c2c, committed 2022-06-21

Comitter:
nxp_ip
Date:
Tue Jun 21 09:13:41 2022 +0000
Parent:
5:e2ad761c8570
Commit message:
fixed comments and format

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/main.cpp	Thu Jun 16 23:39:18 2022 +0000
+++ b/main.cpp	Tue Jun 21 09:13:41 2022 +0000
@@ -1,19 +1,21 @@
 #include "mbed.h"
 #include "PCA9955A.h"
 
+//  making an instance of PCA9955A (PCA9955A is cpmpatible to PCA9955B)
 PCA9955A    led_cntlr( p28, p27, 0x02 );    //  SDA, SCL, Slave_address(option)
 
+//  LED output instances in array
 LedPwmOutCC leds[]  = {
-    LedPwmOutCC ( led_cntlr,  L0  ),         //  Instance for LED0 pin
-    LedPwmOutCC ( led_cntlr,  L1  ),         //  Instance for LED1 pin
-    LedPwmOutCC ( led_cntlr,  L2  ),         //  Instance for LED2 pin
-    LedPwmOutCC ( led_cntlr,  L3  ),         //  Instance for LED3 pin
-    LedPwmOutCC ( led_cntlr,  L4  ),         //  Instance for LED4 pin
-    LedPwmOutCC ( led_cntlr,  L5  ),         //  Instance for LED5 pin
-    LedPwmOutCC ( led_cntlr,  L6  ),         //  Instance for LED6 pin
-    LedPwmOutCC ( led_cntlr,  L7  ),         //  Instance for LED7 pin
-    LedPwmOutCC ( led_cntlr,  L8  ),         //  Instance for LED8 pin
-    LedPwmOutCC ( led_cntlr,  L9  ),         //  Instance for LED9 pin
+    LedPwmOutCC ( led_cntlr,  L0  ),         //  Instance for LED0  pin
+    LedPwmOutCC ( led_cntlr,  L1  ),         //  Instance for LED1  pin
+    LedPwmOutCC ( led_cntlr,  L2  ),         //  Instance for LED2  pin
+    LedPwmOutCC ( led_cntlr,  L3  ),         //  Instance for LED3  pin
+    LedPwmOutCC ( led_cntlr,  L4  ),         //  Instance for LED4  pin
+    LedPwmOutCC ( led_cntlr,  L5  ),         //  Instance for LED5  pin
+    LedPwmOutCC ( led_cntlr,  L6  ),         //  Instance for LED6  pin
+    LedPwmOutCC ( led_cntlr,  L7  ),         //  Instance for LED7  pin
+    LedPwmOutCC ( led_cntlr,  L8  ),         //  Instance for LED8  pin
+    LedPwmOutCC ( led_cntlr,  L9  ),         //  Instance for LED9  pin
     LedPwmOutCC ( led_cntlr, L10  ),         //  Instance for LED10 pin
     LedPwmOutCC ( led_cntlr, L11  ),         //  Instance for LED11 pin
     LedPwmOutCC ( led_cntlr, L12  ),         //  Instance for LED12 pin
@@ -24,16 +26,15 @@
 
 int main()
 {
-     for ( int i = 0; i < 16; i++ )
-        leds[ i ].current( 0.5 );    //  LED pin current output setting to 50%
+    for ( int i = 0; i < 16; i++ )
+        leds[ i ].current( 0.5 );    //  LED output current set to 50%
 
     while(1) {
-        for ( int i = 0; i < 16; i++ )
-        {
+        for ( int i = 0; i < 16; i++ ) {
             for ( float p = 1.0; p >= 0.0; p -= 0.01 ) {
-                leds[ i ]    = p;    //  Set LED0 output PWM dutycycle as 'p'
+                leds[ i ]    = p;   //  set 'p' value into LED output instance
                 wait( 0.01 );
             }
-        }        
+        }
     }
 }