Revision 0:2e6f5ac1b29b, committed 2012-08-10
- Comitter:
- nxp_ip
- Date:
- Fri Aug 10 01:39:02 2012 +0000
- Commit message:
- PCA9955 sample code
Changed in this revision
diff -r 000000000000 -r 2e6f5ac1b29b PCA9955.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/PCA9955.cpp Fri Aug 10 01:39:02 2012 +0000
@@ -0,0 +1,145 @@
+/** PCA9955 constant current LED driver control library
+ *
+ * @class PCA9955
+ * @author NXP Semiconductors Japan
+ * @version 0.5(15-Jun-2011) (publish 10-Aug-2012)
+ *
+ * Copyright: 2011 NXP Semiconductors
+ * Released under the MIT License: http://mbed.org/license/mit
+ * This is a library that controls PCA9955 a constant current LED driver
+ * Example:
+ * @code
+ * #include "mbed.h"
+ * #include "PCA9955.h"
+ *
+ * #define MAX_IREF 0x20
+ *
+ * PCA9955 led_driver( p28, p27, 0xC0 ); // making an instance of PCA9955
+ *
+ * main()
+ * {
+ * char v[ 16 ] = { 0xFF };
+ * int sel;
+ *
+ * srand( 0 );
+ *
+ * led_driver = 0xFFFF;
+ * led_driver.set_all_intensity( v ); // PWM
+ * led_driver.set_all_intensity( MAX_IREF, true ); // IREF
+ *
+ * while ( 1 ) {
+ * for ( sel = 0; sel < 16; sel++ ) {
+ * v[ sel ] = (char)((float)(v[ sel ]) * 0.8);
+ * }
+ *
+ * v[ rand() % 16 ] = 0xFF;
+ *
+ * led_driver.set_all_intensity( v ); // PWM
+ * wait( 0.05 );
+ * }
+ * }
+ * @endcode
+ */
+
+#include "mbed.h"
+#include "PCA9955.h"
+
+PCA9955::PCA9955(
+ PinName I2C_sda,
+ PinName I2C_scl,
+ char I2C_address = PCA9955_ADDR
+) : i2c( I2C_sda, I2C_scl ), i2c_addr( I2C_address ) {
+
+ i2c.frequency( 400 * 1000 );
+ write( init_array, sizeof( init_array[42] ) );
+}
+
+void PCA9955::set_single_individual_intensity( char port, char val, int iref ) {
+ write( (command_reg)((iref ? IREF_REGISTER_START : PWM_REGISTER_START) + port), val );
+}
+
+void PCA9955::set_all_intensity( char *p, int iref ) {
+ char pwm[ PCA9955_N_OF_PORTS + 1 ] = { AUTO_INCREMENT | (iref ? IREF_REGISTER_START : PWM_REGISTER_START) };
+
+ for ( int i = 1; i <= PCA9955_N_OF_PORTS; i++ )
+ pwm[ i ] = *p++;
+
+ write( pwm, PCA9955_N_OF_PORTS + 1 );
+}
+
+void PCA9955::set_all_intensity( char val, int iref ) {
+ char c[ PCA9955_N_OF_PORTS ];
+
+ for ( int i = 0; i < PCA9955_N_OF_PORTS; i++ )
+ c[ i ] = val;
+
+ set_all_intensity( c, iref );
+}
+
+void PCA9955::get_all_intensity( char *p, int iref ) {
+ read( (command_reg)(AUTO_INCREMENT | (iref ? IREF_REGISTER_START : PWM_REGISTER_START)), p, PCA9955_N_OF_PORTS );
+}
+
+void PCA9955::operator=( int c ) {
+ char a[ 1 + (PCA9955_N_OF_PORTS / 4) ] = { AUTO_INCREMENT | LEDOUT_REGISTER_START, 0x00, 0x00, 0x00, 0x00 };
+ char out_val = 0x2;
+
+ for ( int i = 0; i < PCA9955_N_OF_PORTS; i++ )
+ a[ (i / 4) + 1 ] |= (((c >> i) & 0x1) ? out_val : 0x0) << ((i % 4) << 1);
+
+ write( a, sizeof( a ) );
+}
+
+unsigned short PCA9955::fault_test( void )
+{
+ char mode2_reg;
+
+#define FAULTTEST 0x40
+
+ mode2_reg = read( MODE2 );
+ mode2_reg = 0;
+ write( MODE2, mode2_reg | FAULTTEST );
+
+ while ( read( MODE2 ) & FAULTTEST )
+ ;
+
+ return( ((unsigned short)(read( EFLAG1 )) << 8) | read( EFLAG0 ) );
+}
+
+void PCA9955::write( char *data, int length ) {
+ i2c.write( i2c_addr, data, length );
+}
+
+void PCA9955::write( command_reg reg_addr, char data ) {
+ char c[2];
+
+ c[0] = reg_addr;
+ c[1] = data;
+
+ i2c.write( i2c_addr, c, 2 );
+}
+
+void PCA9955::read( command_reg reg_addr, char *data, int length ) {
+ i2c.write( i2c_addr, (char *)(®_addr), 1, true );
+ i2c.read( i2c_addr, data, length );
+}
+
+char PCA9955::read( command_reg reg_addr ) {
+ i2c.write( i2c_addr, (char *)(®_addr), 1, true );
+ i2c.read( i2c_addr, (char *)(®_addr), 1 );
+
+ return ( reg_addr );
+}
+
+char PCA9955::init_array[] = {
+ AUTO_INCREMENT | REGISTER_START, // Command
+ 0x00, 0x05, // MODE1, MODE2
+ 0xAA, 0xAA, 0xAA, 0xAA, // LEDOUT[3:0]
+ 0x80, 0x00, // GRPPWM, GRPFREQ
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // PWM[7:0]
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // PWM[15:8]
+ 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, // IREF[7:0]
+ 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, 0x10, // IREF[15:8]
+ 0x08 // OFFSET: 1uS offsets
+};
+
diff -r 000000000000 -r 2e6f5ac1b29b PCA9955.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/PCA9955.h Fri Aug 10 01:39:02 2012 +0000
@@ -0,0 +1,161 @@
+/** PCA9955 constant current LED driver control library
+ *
+ * @class PCA9955
+ * @author NXP Semiconductors Japan
+ * @version 0.5(15-Jun-2011) (publish 10-Aug-2012)
+ *
+ * Copyright: 2011 NXP Semiconductors
+ * Released under the MIT License: http://mbed.org/license/mit
+ * This is a library that controls PCA9955 a constant current LED driver
+ * Example:
+ * @code
+ * #include "mbed.h"
+ * #include "PCA9955.h"
+ *
+ * #define MAX_IREF 0x20
+ *
+ * PCA9955 led_driver( p28, p27, 0xC0 ); // making an instance of PCA9955
+ *
+ * main()
+ * {
+ * char v[ 16 ] = { 0xFF };
+ * int sel;
+ *
+ * srand( 0 );
+ *
+ * led_driver = 0xFFFF;
+ * led_driver.set_all_intensity( v ); // PWM
+ * led_driver.set_all_intensity( MAX_IREF, true ); // IREF
+ *
+ * while ( 1 ) {
+ * for ( sel = 0; sel < 16; sel++ ) {
+ * v[ sel ] = (char)((float)(v[ sel ]) * 0.8);
+ * }
+ *
+ * v[ rand() % 16 ] = 0xFF;
+ *
+ * led_driver.set_all_intensity( v ); // PWM
+ * wait( 0.05 );
+ * }
+ * }
+ * @endcode
+ */
+
+#ifndef MBED_PCA9955
+#define MBED_PCA9955
+
+#include "mbed.h"
+
+// PCA9955 I2C address
+
+#if 0
+#define PCA9955_ADDR 0xC0
+
+#define PCA9955_INIT_PWM 0xFF
+#define PCA9955_N_OF_PORTS 16
+
+#define AUTO_INCREMENT 0x80
+#define REGISTER_START 0x00
+#define LEDOUT_REGISTER_START 0x02
+#define PWM_REGISTER_START 0x0A
+#define IREF_REGISTER_START 0x22
+#endif
+
+class PCA9955 {
+public:
+ PCA9955( PinName I2C_sda, PinName I2C_scl, char I2C_address );
+ void set_single_individual_intensity( char port, char val, int iref = false );
+ void set_all_intensity( char *p, int iref = false );
+ void set_all_intensity( char val, int iref = false );
+ void get_all_intensity( char *p, int iref = false );
+ void operator=( int c );
+ unsigned short fault_test( void );
+
+private:
+
+ enum {
+ PCA9955_ADDR = 0xC0,
+ };
+
+ enum {
+ PCA9955_INIT_PWM = 0xFF,
+ PCA9955_N_OF_PORTS = 16,
+ };
+
+ typedef enum {
+ MODE1 = 0x00,
+ MODE2,
+ LEDOUT0,
+ LEDOUT1,
+ LEDOUT2,
+ LEDOUT3,
+ GRPPWM = 0x08,
+ GRPFREQ,
+ PWM0 = 0x0A,
+ PWM1,
+ PWM2,
+ PWM3,
+ PWM4,
+ PWM5,
+ PWM6,
+ PWM7,
+ PWM8,
+ PWM9,
+ PWM10,
+ PWM11,
+ PWM12,
+ PWM13,
+ PWM14,
+ PWM15,
+ IREF0 = 0x22,
+ IREF1,
+ IREF2,
+ IREF3,
+ IREF4,
+ IREF5,
+ IREF6,
+ IREF7,
+ IREF8,
+ IREF9,
+ IREF10,
+ IREF11,
+ IREF12,
+ IREF13,
+ IREF14,
+ IREF15,
+ OFFSET = 0x3A,
+ SUBADR1,
+ SUBADR2,
+ SUBADR3,
+ ALLCALLADR,
+ RESERVED1,
+ RESERVED2,
+ RESERVED3,
+ PWMALL,
+ IREFALL,
+ EFLAG0,
+ EFLAG1,
+
+ REGISTER_START = MODE1,
+ LEDOUT_REGISTER_START = LEDOUT0,
+ PWM_REGISTER_START = PWM0,
+ IREF_REGISTER_START = IREF0,
+ }
+ command_reg;
+
+ enum {
+ AUTO_INCREMENT = 0x80,
+ };
+
+
+ I2C i2c;
+ char i2c_addr;
+ static char init_array[];
+ void write( char *data, int length );
+ void write( command_reg reg_addr, char data );
+ void read( command_reg reg_addr, char *data, int length );
+ char read( command_reg reg_addr );
+}
+;
+
+#endif // MBED_PCA9955
InetrfaceProducts NXP
PCA9952/55 16-channel LED driver