Datasheet

4. Programming Examples

This section gives practical programming examples. A series of programs introduce the main features of the LP5523 chip and the

example programs are easy to tailor to the specific needs of end application.

EXAMPLE 1: CONTROLLING MULTIPLE LEDS WITH ONE ENGINE

The example below is basically the program shown in the Figure 6 above (simple LP5523 program);, the LED mapping table below

is used to establish engine1-to-LEDs connection. In the mapping table '0' means that the LED isn't connected to the engine; '1'

means that the LED is connected to the engine. In the example program below bits 6 to 8 are set to ‘1’ so that outputs 7, 8 and 9

are mapped to the engine 1.

LED Mapping Chart

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Output GPO N/A N/A N/A N/A N/A N/A D9 D8 D7 D6 D5 D4 D3 D2 D1

mapping_table: dw 0000000111000000b ;Red LEDs on the evaluation board.

;'1' = LED is mapped; '0'= LED isn't mapped.

.segment program1 ;Begin of a segment.

mux_map_start mapping_table ;Mapping table start address in the memory.

;The first row of the table will be activated

loop1: set_pwm FFh ;Beginning of a loop, set PWM to full scale.

wait 0.48 ;Wait for 0.48 seconds.

set_pwm 00h ;Set PWM to 0%.

wait 0.48 ;Wait for 0.48 seconds.

branch 0,loop1 ;Endless loop.

AN-2227 - LP5523 Evaluation Kit