boards/qn9080dk: Enable driver for I2C0

The QN9080DK board can expose the I2C bus SDA and SCL in the pins
labeled D14 and D15 respectively in the J5 headers, and in the Pmod (J8)
connector in the pins 10 and 9 of the header respectively.

The bus has a 2K2 pull up resistor on each line when SB7 and SB8 (next
to the Pmod connector) are closed, which is the factory default.

boards/qn9080dk/Kconfig

@@ -19,6 +19,7 @@ config BOARD_QN9080DK
     select BOARD_HAS_XTAL_32M
     select HAS_PERIPH_TIMER
     select HAS_PERIPH_UART
+    select HAS_PERIPH_I2C
     select HAS_PERIPH_UART_MODECFG
 
 source "$(RIOTBOARD)/common/qn908x/Kconfig"

boards/qn9080dk/Makefile.features

@@ -3,6 +3,7 @@ CPU_MODEL = qn9080xhn
 
 # Put defined MCU peripherals here (in alphabetical order)
 FEATURES_PROVIDED += periph_gpio periph_gpio_irq
+FEATURES_PROVIDED += periph_i2c
 FEATURES_PROVIDED += periph_timer
 FEATURES_PROVIDED += periph_uart periph_uart_modecfg
 

boards/qn9080dk/include/board.h

@@ -56,6 +56,18 @@ extern "C" {
 #define BTN2_MODE        GPIO_IN_PU
 /** @} */
 
+/**
+ * @name    MMA8652FC 3-axis accelerometer bus configuration
+ *
+ * The MMA8652FC in the QN9080DK is only available when JP11 is shorted (the
+ * factory default).
+ * @{
+ */
+#define MMA8X5X_PARAM_I2C       I2C_DEV(0)
+#define MMA8X5X_PARAM_ADDR      0x1D
+#define MMA8X5X_PARAM_TYPE      (MMA8X5X_TYPE_MMA8652)
+/** @} */
+
 /**
  * @brief   Initialize board specific hardware
  */

boards/qn9080dk/include/periph_conf.h

@@ -28,6 +28,21 @@
 extern "C" {
 #endif
 
+/**
+ * @name I2C configuration
+ * @{
+ */
+static const i2c_conf_t i2c_config[] = {
+    {
+        .dev          = I2C1,
+        .pin_scl      = GPIO_PIN(PORT_A, 6),
+        .pin_sda      = GPIO_PIN(PORT_A, 7),
+        .speed        = I2C_SPEED_FAST,
+    },
+};
+#define I2C_NUMOF           ARRAY_SIZE(i2c_config)
+/** @} */
+
 /**
  * @name   UART configuration
  * @{
@@ -54,7 +69,6 @@ static const uart_conf_t uart_config[] = {
    - Available clocks
    - PWMs
    - SPIs
-   - I2C
    - ADC
    - RTC
    - RTT