Make headers in extras more cpp friendly

extras/bmp180/bmp180.h

@@ -20,6 +20,10 @@
 #define BMP180_TEMPERATURE (1<<0)
 #define BMP180_PRESSURE    (1<<1)
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 //
 // Create bmp180_types
 //
@@ -79,4 +83,8 @@ bool bmp180_fillInternalConstants(bmp180_constants_t *c);
 bool bmp180_measure(bmp180_constants_t *c, int32_t *temperature,
                     uint32_t *pressure, uint8_t oss);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* DRIVER_BMP180_H_ */

extras/bmp280/bmp280.h

@@ -27,6 +27,10 @@
 #include <stdint.h>
 #include <stdbool.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /**
  * Uncomment to enable debug output.
  */
@@ -184,4 +188,8 @@ bool bmp280_read_fixed(bmp280_t *dev, int32_t *temperature,
 bool bmp280_read_float(bmp280_t *dev, float *temperature,
                        float *pressure, float *humidity);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif  // __BMP280_H__

extras/dhcpserver/include/dhcpserver.h

@@ -14,6 +14,10 @@
 #define DHCPSERVER_LEASE_TIME 3600
 #endif
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* Start DHCP server.
 
    Static IP of server should already be set and network interface enabled.
@@ -30,4 +34,8 @@ void dhcpserver_get_lease(const ip_addr_t *first_client_addr, uint8_t max_leases
  */
 void dhcpserver_stop(void);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

extras/dht/dht.h

@@ -17,6 +17,10 @@
 // Type of sensor to use
 #define DHT_TYPE    DHT22
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /**
  * Read data from sensor on specified pin.
  *
@@ -35,4 +39,8 @@ bool dht_read_data(uint8_t pin, int16_t *humidity, int16_t *temperature);
  */
 bool dht_read_float_data(uint8_t pin, float *humidity, float *temperature);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif  // __DHT_H__

extras/ds18b20/ds18b20.h

@@ -3,6 +3,10 @@
 
 #include "onewire/onewire.h"
 
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
 /** @file ds18b20.h
  *
  *  Communicate with the DS18B20 family of one-wire temperature sensor ICs.
@@ -147,4 +151,8 @@ uint8_t ds18b20_read_all(uint8_t pin, ds_sensor_t *result);
 // temperature from single dallas chip.
 float ds18b20_read_single(uint8_t pin);
 
+#ifdef	__cplusplus
+}
 #endif
+
+#endif  /* DRIVER_DS18B20_H_ */

extras/ds3231/ds3231.h

@@ -13,6 +13,10 @@
 #include <stdbool.h>
 #include <time.h>
 
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
 #define DS3231_ADDR            0x68
 
 #define DS3231_STAT_OSCILLATOR 0x80
@@ -184,4 +188,8 @@ bool ds3231_getTempFloat(float *temp);
 bool ds3231_getTime(struct tm *time);
 void ds3231_Init(uint8_t scl, uint8_t sda);
 
+#ifdef	__cplusplus
+}
 #endif
+
+#endif  /* __DS3231_H__ */

extras/i2c/i2c.h

@@ -24,11 +24,14 @@
 
 #ifndef __I2C_H__
 #define __I2C_H__
-#endif
 
 #include <stdint.h>
 #include <stdbool.h>
 
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
 // Init bitbanging I2C driver on given pins
 void i2c_init(uint8_t scl_pin, uint8_t sda_pin);
 
@@ -49,3 +52,9 @@ bool i2c_slave_read(uint8_t slave_addr, uint8_t data, uint8_t *buf, uint32_t len
 // devices where the i2c_slave_[read|write] functions above are of no use.
 void i2c_start(void);
 void i2c_stop(void);
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif /* __I2C_H__ */

extras/i2s_dma/i2s_dma.h

@@ -28,6 +28,10 @@
 #include <stdbool.h>
 #include "esp/slc_regs.h"
 
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
 typedef void (*i2s_dma_isr_t)(void);
 
 typedef struct dma_descriptor {
@@ -113,4 +117,8 @@ inline dma_descriptor_t *i2s_dma_get_eof_descriptor()
     return (dma_descriptor_t*)SLC.RX_EOF_DESCRIPTOR_ADDR;
 }
 
+#ifdef	__cplusplus
+}
+#endif
+
 #endif  // __I2S_DMA_H__

extras/onewire/onewire.h

@@ -4,6 +4,10 @@
 #include <espressif/esp_misc.h> // sdk_os_delay_us
 #include "FreeRTOS.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /** @file onewire.h
  *
  *  Routines to access devices using the Dallas Semiconductor 1-Wire(tm)
@@ -232,4 +236,8 @@ bool onewire_check_crc16(const uint8_t* input, size_t len, const uint8_t* invert
  */
 uint16_t onewire_crc16(const uint8_t* input, size_t len, uint16_t crc_iv);
 
+#ifdef __cplusplus
+}
 #endif
+
+#endif  /* __ONEWIRE_H__ */

extras/pwm/pwm.h

@@ -5,10 +5,17 @@
  * Copyright (C) 2015 Javier Cardona (https://github.com/jcard0na)
  * BSD Licensed as described in the file LICENSE
  */
+#ifndef EXTRAS_PWM_H_
+#define EXTRAS_PWM_H_
+
 #include <stdint.h>
 
 #define MAX_PWM_PINS    8
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 void pwm_init(uint8_t npins, uint8_t* pins);
 void pwm_set_freq(uint16_t freq);
 void pwm_set_duty(uint16_t duty);
@@ -16,3 +23,9 @@ void pwm_set_duty(uint16_t duty);
 void pwm_restart();
 void pwm_start();
 void pwm_stop();
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* EXTRAS_PWM_H_ */

extras/ws2812/ws2812.h

@@ -35,6 +35,10 @@
 #include "espressif/esp_common.h" // sdk_os_delay_us
 #include "esp/gpio.h"
 
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
 /**
  * @brief Struct for easy manipulation of RGB colors.
  *
@@ -204,5 +208,8 @@ void ws2812_seq_end(void)
     sdk_os_delay_us(50); // display the loaded colors
 }
 
+#ifdef	__cplusplus
+}
+#endif
 
 #endif /* WS2812_DRV_H */

extras/ws2812_i2s/ws2812_i2s.h

@@ -27,6 +27,10 @@
 #include <stdint.h>
 #include <stdbool.h>
 
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
 typedef struct {
     uint8_t red;
     uint8_t green;
@@ -50,4 +54,8 @@ void ws2812_i2s_init(uint32_t pixels_number);
  */
 void ws2812_i2s_update(ws2812_pixel_t *pixels);
 
+#ifdef	__cplusplus
+}
+#endif
+
 #endif  // __WS2812_I2S_H__