MAX44009 sensor driver.
- Read light intensity
It is easy to port this library to any platform. But now it is ready for use in:
- AVR (ATmega32)
- ESP32 (esp-idf)
- STM32 (HAL)
- Add
MAX44009.handMAX44009.cfiles to your project. It is optional to useMAX44009_platform.handMAX44009_platform.cfiles (open and configMAX44009_platform.hfile). - Initialize platform-dependent part of handler.
- Call
MAX44009_Init(). - Call
MAX44009_SetAddressI2C(). - Call other functions and enjoy.
Using MAX44009_platform files
#include <stdio.h>
#include "MAX44009.h"
#include "MAX44009_platform.h"
int main(void)
{
MAX44009_Handler_t Handler;
MAX44009_Sample_t Sample;
MAX44009_Platform_Init(&Handler);
MAX44009_Init(&Handler);
MAX44009_SetAddressI2C(&Handler, 0);
while (1)
{
MAX44009_ReadSample(&Handler, &Sample);
printf("Light Intensity: %fLux\r\n\r\n",
Sample.Lux);
}
MAX44009_DeInit(&Handler);
return 0;
}Without using MAX44009_platform files (esp-idf)
#include <stdio.h>
#include <stdint.h>
#include "sdkconfig.h"
#include "esp_system.h"
#include "esp_err.h"
#include "driver/i2c.h"
#include "driver/gpio.h"
#include "freertos/FreeRTOS.h"
#include "MAX44009.h"
#define MAX44009_I2C_NUM I2C_NUM_1
#define MAX44009_I2C_RATE 100000
#define MAX44009_SCL_GPIO GPIO_NUM_13
#define MAX44009_SDA_GPIO GPIO_NUM_14
int8_t
MAX44009_Platform_Init(void)
{
i2c_config_t conf = {0};
conf.mode = I2C_MODE_MASTER;
conf.sda_io_num = MAX44009_SDA_GPIO;
conf.sda_pullup_en = GPIO_PULLUP_DISABLE;
conf.scl_io_num = MAX44009_SCL_GPIO;
conf.scl_pullup_en = GPIO_PULLUP_DISABLE;
conf.master.clk_speed = MAX44009_I2C_RATE;
if (i2c_param_config(MAX44009_I2C_NUM, &conf) != ESP_OK)
return -1;
if (i2c_driver_install(MAX44009_I2C_NUM, conf.mode, 0, 0, 0) != ESP_OK)
return -1;
return 0;
}
int8_t
MAX44009_Platform_DeInit(void)
{
i2c_driver_delete(MAX44009_I2C_NUM);
gpio_reset_pin(MAX44009_SDA_GPIO);
gpio_reset_pin(MAX44009_SCL_GPIO);
return 0;
}
int8_t
MAX44009_Platform_Send(uint8_t Address, uint8_t *Data, uint8_t DataLen)
{
i2c_cmd_handle_t MAX44009_i2c_cmd_handle = 0;
Address <<= 1;
Address &= 0xFE;
MAX44009_i2c_cmd_handle = i2c_cmd_link_create();
i2c_master_start(MAX44009_i2c_cmd_handle);
i2c_master_write(MAX44009_i2c_cmd_handle, &Address, 1, 1);
i2c_master_write(MAX44009_i2c_cmd_handle, Data, DataLen, 1);
i2c_master_stop(MAX44009_i2c_cmd_handle);
if (i2c_master_cmd_begin(MAX44009_I2C_NUM, MAX44009_i2c_cmd_handle, 1000 / portTICK_RATE_MS) != ESP_OK)
{
i2c_cmd_link_delete(MAX44009_i2c_cmd_handle);
return -1;
}
i2c_cmd_link_delete(MAX44009_i2c_cmd_handle);
return 0;
}
int8_t
MAX44009_Platform_Receive(uint8_t Address, uint8_t *Data, uint8_t DataLen)
{
i2c_cmd_handle_t MAX44009_i2c_cmd_handle = 0;
Address <<= 1;
Address |= 0x01;
MAX44009_i2c_cmd_handle = i2c_cmd_link_create();
i2c_master_start(MAX44009_i2c_cmd_handle);
i2c_master_write(MAX44009_i2c_cmd_handle, &Address, 1, 1);
i2c_master_read(MAX44009_i2c_cmd_handle, Data, DataLen, I2C_MASTER_LAST_NACK);
i2c_master_stop(MAX44009_i2c_cmd_handle);
if (i2c_master_cmd_begin(MAX44009_I2C_NUM, MAX44009_i2c_cmd_handle, 1000 / portTICK_RATE_MS) != ESP_OK)
{
i2c_cmd_link_delete(MAX44009_i2c_cmd_handle);
return -1;
}
i2c_cmd_link_delete(MAX44009_i2c_cmd_handle);
return 0;
}
int main(void)
{
MAX44009_Handler_t Handler;
MAX44009_Sample_t Sample;
Handler.PlatformInit = MAX44009_Platform_Init;
Handler.PlatformDeInit = MAX44009_Platform_DeInit;
Handler.PlatformSend = MAX44009_Platform_Send;
Handler.PlatformReceive = MAX44009_Platform_Receive;
MAX44009_Init(&Handler);
MAX44009_SetAddressI2C(&Handler, 0);
while (1)
{
MAX44009_ReadSample(&Handler, &Sample);
printf("Light Intensity: %fLux\r\n\r\n",
Sample.Lux);
}
MAX44009_DeInit(&Handler);
return 0;
}