Kurs Raspberry Pi Pico – #13 – biblioteka dla cyfrowego czujnika światła 2/2, DMA

#include <stdio.h>
#include "pico/stdlib.h"
#include "hardware/i2c.h"
#include "veml7700.h"

void veml7700_i2c_init(){
    i2c_init(I2C_PORT, 100 * 1000); // I2C 100kHz

    gpio_set_function(SDA_PIN, GPIO_FUNC_I2C);
    gpio_set_function(SCL_PIN, GPIO_FUNC_I2C);
    gpio_pull_up(SDA_PIN);
    gpio_pull_up(SCL_PIN);
}

void veml7700_write_register(veml7700_t *sensor, uint8_t reg, uint16_t value) {
    uint8_t data[3] = {reg, value & 0xFF, value >> 8};
    i2c_write_blocking(sensor->i2c, sensor->address, data, 3, false);
}

uint16_t veml7700_read_register(veml7700_t *sensor, uint8_t reg) {
    uint8_t buffer[2];
    i2c_write_blocking(sensor->i2c, sensor->address, &reg, 1, true);
    i2c_read_blocking(sensor->i2c, sensor->address, buffer, 2, false);
    return (buffer[1] << 8) | buffer[0];
}

void veml7700_init(veml7700_t *sensor, i2c_inst_t *i2c, uint8_t address) {
    sensor->i2c = i2c;
    sensor->address = address;
    veml7700_write_register(sensor, VEML7700_ALS_CONF_0, 0x0000);
}

uint16_t veml7700_read_light(veml7700_t *sensor) {
    return veml7700_read_register(sensor, VEML7700_ALS);
}

uint16_t veml7700_read_white(veml7700_t *sensor) {
    return veml7700_read_register(sensor, VEML7700_WHITE);
}

uint16_t veml7700_read_interrupt(veml7700_t *sensor) {
    return veml7700_read_register(sensor, VEML7700_ALS_INT);
}

uint16_t veml7700_read_id(veml7700_t *sensor) {
    return veml7700_read_register(sensor, VEML7700_ID_REG);
}

void veml7700_set_integration_time(veml7700_t *sensor, uint16_t time) {
    uint16_t config = veml7700_read_register(sensor, VEML7700_ALS_CONF_0);
    config &= ~(0x0F << 6); // Clear previous integration time settings
    config |= (time << 6);  // Set a new integration time
    veml7700_write_register(sensor, VEML7700_ALS_CONF_0, config);
}

void veml7700_set_gain(veml7700_t *sensor, uint16_t gain) {
    uint16_t config = veml7700_read_register(sensor, VEML7700_ALS_CONF_0);
    config &= ~(0x03 << 4); // Clear previous gain settings
    config |= (gain << 4);  // Set a new gain
    veml7700_write_register(sensor, VEML7700_ALS_CONF_0, config);
}

void veml7700_set_persistence(veml7700_t *sensor, uint8_t persistence) {
    uint16_t config = veml7700_read_register(sensor, VEML7700_ALS_CONF_0);
    config &= ~(0x03 << 4); // Clear previous ALS_PERS settings
    config |= (persistence << 4); // Set new ALS_PERS bits
    veml7700_write_register(sensor, VEML7700_ALS_CONF_0, config);
}

void veml7700_power_save(veml7700_t *sensor, uint16_t mode) {
    veml7700_write_register(sensor, VEML7700_POWER_SAVING, mode);
}

void veml7700_set_high_threshold(veml7700_t *sensor, uint16_t threshold) {
    veml7700_write_register(sensor, VEML7700_ALS_WH, threshold);
}

void veml7700_set_low_threshold(veml7700_t *sensor, uint16_t threshold) {
    veml7700_write_register(sensor, VEML7700_ALS_WL, threshold);
}

void veml7700_enable_interrupt(veml7700_t *sensor) {
    uint16_t config = veml7700_read_register(sensor, VEML7700_ALS_CONF_0);
    config |= (1 << 1); // Setting the bit responsible for interrupts
    veml7700_write_register(sensor, VEML7700_ALS_CONF_0, config);
}

void veml7700_disable_interrupt(veml7700_t *sensor) {
    uint16_t config = veml7700_read_register(sensor, VEML7700_ALS_CONF_0);
    config &= ~(1 << 1); // Clearing the bit responsible for interrupts
    veml7700_write_register(sensor, VEML7700_ALS_CONF_0, config);
}