PCA9632 - LED Driver

LED driver used for NOTICE PAL.

Process flow

1.Wire.begin(): Initialize bus 2 .setup(): Initialize the class object .reset(): Initialization of the driver 4. 4. various procedures

About PCA9632

This is a 4-channel LED driver.

• Each channel can specify 4 states: off, all lights on, PWM on, and blinking.

• Each channel can control illuminance (PWM) independently.

• All chs designated as blinking have the same blinking pattern.

• When blinking, illuminance can be controlled for each channel individually by PWM

Procedures required for operation

Wire bus

Before calling the setup() method, Wire must be put into operation state by Wire.begin().

Procedures when returning from sleep mode

Keep the Wire bus in the operating state just before sleep (the Wire is automatically restored after sleep recovery).

Code Example

#include <TWELITE>
#include <SNS_PCA9632>

SNS_PCA9632 pca;

#include <SNS_PCA9632> and declaration of SNS_PCA9632 class object is required.

Initialization & Reset

void setup() {
    Wire.begin();
    pca.setup();
    pca.reset();
}

点灯

...
 ​  pca.set_led_duty_all(
      127,
      127,
      127,
      127
   );
   
   pca.set_led_status(
      SNS_PCA9632::LED_PWM,
      SNS_PCA9632::LED_NOP,
      SNS_PCA9632::LED_PWM,
      SNS_PCA9632::LED_NOP);

In the above example, LEDs 1 and 3 are turned on by PWM control.

Methods.

Constructor, setup()

SnsPCA9632(uint8_t i2c_addr = DEFAULT_I2C_ADDRESS)
void setup(uint8_t i2c_addr = DEFAULT_I2C_ADDRESS)

Specify i2c_addr in the constructor.

If you define a class object in a global declaration, the constructor will not be called, so call setup().

reset()

bool reset()

Initializes the device. \0x0} Writes {0x81, 0x35, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F, 0x0B, 0x00} starting with register address 0x0.

set_mode2()

bool set_mode2(uint8_t u8var = 0x35)

Write a value to the MODE2 register.

set_power_mode()

bool set_power_mode(bool b_pow_on)

Setting b_pow_on to true will cause normal operation, setting it to false will cause sleep.

set_blink_cycle() set_blink_cycle_ms()

bool set_blink_cycle(uint8_t u8var)
bool set_blink_cycle_ms(uint16_t u16ms)

Determines the blinking (group PWM) period.

If u8var is specified, the period is (u8var+1)/24[s].

The u16ms specifies the period in œms.

set_blink_duty()

bool set_blink_duty(uint8_t u8duty);

Determines the duty ratio of blinking (group PWM). The lighting period is u8duty/256, where 0 corresponds to lights off and 255 corresponds to all lights on.

set_led_duty()

bool set_led_duty(uint8_t port, uint8_t duty)

brightness (duty ratio of PMW control).

port specifies the target LED (SNS_PCA9632::LED1..4).

... duty specifies 0..255, and the LEDs are turned on with the ratio duty/256.

set_led_duty_all()

bool set_led_duty_all(uint8_t p1, uint8_t p2, uint8_t p3, uint8_t p4)

Specify the brightness (duty ratio of PMW control) for all LEDs.

p1,p2,p3,p4 specifies 0...255 in duty for LED1...4. The LEDs turn on at a ratio duty/256.

set_led_status()

bool set_led_status(uint8_t u8led1, uint8_t u8led2, uint8_t u8led3, uint8_t u8led4)

Changes the lighting state of all LEDs.

u8led1..4 specifies the state of LED1..4 in order.

The states that can be specified are as follows.

probe()

bool probe()

Returns true if a device exists on the I2C bus.

show_registers()

void show_registers()

Displays the value of register (0x0-0x8).