Add I2C bus speed configuration

Config.hpp

@@ -8,6 +8,12 @@
 /* Warning: SAF775X support is currently very experimental */
 #define TUNER_DRIVER TEF668X
 
+/* I2C bus clock speed */
+/* Typical values: 100 kHz (100000L) or 400 kHz (400000L)
+   Reduce speed to decrease interference (for bad PCB design) or when
+   capacitors are added to the bus lines (the speed is limited) */
+#define TUNER_I2C_CLOCK 400000L
+
 /* I2C pull-ups in Arduino AVR driver */
 /* Enable only on Arduino boards modified to 3.3V operation
    For 5V boards use external 10 kΩ pull-ups from SDA and SCL to 3.3V */

presets/tef-headless/Config.hpp

@@ -8,6 +8,12 @@
 /* Warning: SAF775X support is currently very experimental */
 #define TUNER_DRIVER TEF668X
 
+/* I2C bus clock speed */
+/* Typical values: 100 kHz (100000L) or 400 kHz (400000L)
+   Reduce speed to decrease interference (for bad PCB design) or when
+   capacitors are added to the bus lines (the speed is limited) */
+#define TUNER_I2C_CLOCK 400000L
+
 /* I2C pull-ups in Arduino AVR driver */
 /* Enable only on Arduino boards modified to 3.3V operation
    For 5V boards use external 10 kΩ pull-ups from SDA and SCL to 3.3V */

src/I2c/I2cMaster/I2cMaster.h

@@ -29,11 +29,12 @@
 #else  // ARDUINO
 #include <Arduino.h>
 #endif  // ARDUINO
+#include "Config.hpp"
 
 #ifdef ARDUINO_ARCH_AVR
 
 /** hardware I2C clock in Hz */
-uint32_t const F_TWI = 400000L;
+uint32_t const F_TWI = TUNER_I2C_CLOCK;
 
 /** Delay used for software I2C */
 uint8_t const I2C_DELAY_USEC = 4;

src/I2c/I2cWire.cpp

@@ -18,6 +18,7 @@
 #include <Wire.h>
 #include "I2cWire.hpp"
 #include "../Utils/Utils.hpp"
+#include "Config.hpp"
 #ifdef ARDUINO_ARCH_ESP32
 #include <driver/gpio.h>
 #endif
@@ -30,6 +31,7 @@ void
 I2cWire::init(void)
 {
     Wire.begin();
+    Wire.setClock(TUNER_I2C_CLOCK);
 #ifdef ARDUINO_ARCH_ESP32
     /* Decrease I2C bus inteference */
     gpio_set_drive_capability((gpio_num_t)21, GPIO_DRIVE_CAP_0);