InetrfaceProducts NXP
Sample code to demonstrate PCA9955A's gradation control
PCA9955B and PCA9956B are I²C-bus controlled 16-channel constant current LED driver optimized for dimming and blinking.
Revision 5:33de84f8a660, committed 2022-06-17
- Comitter:
- nxp_ip
- Date:
- Fri Jun 17 06:09:24 2022 +0000
- Parent:
- 4:efcaf7b7e16f
- Commit message:
- Made gradation period shorter
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
diff -r efcaf7b7e16f -r 33de84f8a660 main.cpp
--- a/main.cpp Thu Jun 16 23:21:52 2022 +0000
+++ b/main.cpp Fri Jun 17 06:09:24 2022 +0000
@@ -3,7 +3,7 @@
#include "PCA9955A.h"
PCA9955A led_cntlr( p28, p27, 0x02 ); // SDA, SCL, Slave_address(option)
-#define GRADATION_PERIOD 6.0
+#define GRADATION_PERIOD 2.8
#define MANUAL_BLINK_PERIOD 0.1
#define MANUAL_BLINK_ON_DURATION 0.03
@@ -32,9 +32,11 @@
// Making same gradation shape to group 0, 1 and 2
// The gradation shape will be total 6 seconds cycle including 2 seconds LED-OFF
float cycle =
- led_cntlr.gradation_ramp_setting( 0, GRADATION_PERIOD, HOLD_0_00_SEC, HOLD_2_00_SEC, RAMP_UP_DOWN );
- led_cntlr.gradation_ramp_setting( 1, GRADATION_PERIOD, HOLD_0_00_SEC, HOLD_2_00_SEC, RAMP_UP_DOWN );
- led_cntlr.gradation_ramp_setting( 2, GRADATION_PERIOD, HOLD_0_00_SEC, HOLD_2_00_SEC, RAMP_UP_DOWN );
+ led_cntlr.gradation_ramp_setting( 0, GRADATION_PERIOD, HOLD_0_00_SEC, HOLD_0_75_SEC, RAMP_UP_DOWN );
+ led_cntlr.gradation_ramp_setting( 1, GRADATION_PERIOD, HOLD_0_00_SEC, HOLD_0_75_SEC, RAMP_UP_DOWN );
+ led_cntlr.gradation_ramp_setting( 2, GRADATION_PERIOD, HOLD_0_00_SEC, HOLD_0_75_SEC, RAMP_UP_DOWN );
+
+ // printf( "cycle = %f\r\n", cycle );
// Start group 0
led_cntlr.gradation_start( 0 );