add SPI to the index

watch-library/shared/watch/watch.h

@@ -46,7 +46,8 @@
             - @ref gpio - This section covers functions related to general-purpose input and output signals.
             - @ref i2c - This section covers functions related to the SAM L22's built-I2C driver, including configuring
                          the I2C bus, putting values directly on the bus and reading data from registers on I2C devices.
-            - @ref debug - This section covers functions related to the debug UART, available on pin D1 of the 9-pin connector.
+            - @ref spi - This section covers functions related to the SAM L22's built-in SPI driver.
+            - @ref uart - This section covers functions related to the UART peripheral.
             - @ref deepsleep - This section covers functions related to preparing for and entering BACKUP mode, the
                                deepest sleep mode available on the SAM L22.
  */

watch-library/shared/watch/watch_spi.h

@@ -56,8 +56,9 @@ bool watch_spi_write(const uint8_t *buf, uint16_t length);
 bool watch_spi_read(uint8_t *buf, uint16_t length);
 
 /** @brief Reads a series of values from a device on the SPI bus.
-  * @param buf Storage for the incoming bytes; on return, it will contain the received data.
-  * @param length The number of bytes that you wish to receive.
+  * @param data_out Storage for outgoing bytes.
+  * @param data_in Storage for incoming bytes.
+  * @param length The number of bytes to transfer.
   * @note This function does not manage the chip select pin (usually A3).
   */
 bool watch_spi_transfer(const uint8_t *data_out, uint8_t *data_in, uint16_t length);

watch-library/shared/watch/watch_uart.h

@@ -27,7 +27,7 @@
 
 #include "watch.h"
 
-/** @addtogroup debug UART
+/** @addtogroup uart UART
   * @brief This section covers functions related to the UART peripheral.
   **/
 /// @{