From c2385117956322a810a643e7254c701f2325b5da Mon Sep 17 00:00:00 2001
From: joeycastillo <joeycastillo@utexas.edu>
Date: Tue, 8 Oct 2024 21:04:25 -0400
Subject: [PATCH] refactor watch I2C for gossamer

---
 Makefile                                 |  2 ++
 watch-library/hardware/watch/watch_i2c.c | 23 ++++++++++++-----------
 watch-library/shared/watch/watch.h       |  2 +-
 3 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/Makefile b/Makefile
index 693341a1..784d51ba 100644
--- a/Makefile
+++ b/Makefile
@@ -67,6 +67,7 @@ SRCS += \
   ./watch-library/simulator/watch/watch_deepsleep.c \
   ./watch-library/simulator/watch/watch_extint.c \
   ./watch-library/simulator/watch/watch_gpio.c \
+  ./watch-library/simulator/watch/watch_i2c.c \
   ./watch-library/simulator/watch/watch_private.c \
   ./watch-library/simulator/watch/watch_rtc.c \
   ./watch-library/simulator/watch/watch_slcd.c \
@@ -86,6 +87,7 @@ SRCS += \
   ./watch-library/hardware/watch/watch_deepsleep.c \
   ./watch-library/hardware/watch/watch_extint.c \
   ./watch-library/hardware/watch/watch_gpio.c \
+  ./watch-library/hardware/watch/watch_i2c.c \
   ./watch-library/hardware/watch/watch_private.c \
   ./watch-library/hardware/watch/watch_rtc.c \
   ./watch-library/hardware/watch/watch_slcd.c \
diff --git a/watch-library/hardware/watch/watch_i2c.c b/watch-library/hardware/watch/watch_i2c.c
index ff20afc6..05833304 100644
--- a/watch-library/hardware/watch/watch_i2c.c
+++ b/watch-library/hardware/watch/watch_i2c.c
@@ -23,28 +23,29 @@
  */
 
 #include "watch_i2c.h"
-
-struct io_descriptor *I2C_0_io;
+#include "i2c.h"
 
 void watch_enable_i2c(void) {
-    I2C_0_init();
-    i2c_m_sync_get_io_descriptor(&I2C_0, &I2C_0_io);
-    i2c_m_sync_enable(&I2C_0);
+    // NOTE: I2C sensors are not supported on Sensor Watch Lite, so there are no SDA/SCL pin definitions.
+    // This ifdef is here to prevent the build from failing.
+#ifdef I2C_SERCOM
+    HAL_GPIO_SDA_pmuxen(HAL_GPIO_PMUX_SERCOM);
+    HAL_GPIO_SCL_pmuxen(HAL_GPIO_PMUX_SERCOM);
+#endif
+    i2c_init();
+    i2c_enable();
 }
 
 void watch_disable_i2c(void) {
-    i2c_m_sync_disable(&I2C_0);
-	hri_mclk_clear_APBCMASK_SERCOM1_bit(MCLK);
+    i2c_disable();
 }
 
 void watch_i2c_send(int16_t addr, uint8_t *buf, uint16_t length) {
-    i2c_m_sync_set_periphaddr(&I2C_0, addr, I2C_M_SEVEN);
-    io_write(I2C_0_io, buf, length);
+    i2c_write(addr, buf, length);
 }
 
 void watch_i2c_receive(int16_t addr, uint8_t *buf, uint16_t length) {
-    i2c_m_sync_set_periphaddr(&I2C_0, addr, I2C_M_SEVEN);
-    io_read(I2C_0_io, buf, length);
+    i2c_read(addr, buf, length);
 }
 
 void watch_i2c_write8(int16_t addr, uint8_t reg, uint8_t data) {
diff --git a/watch-library/shared/watch/watch.h b/watch-library/shared/watch/watch.h
index 12d583df..c6a81dd3 100644
--- a/watch-library/shared/watch/watch.h
+++ b/watch-library/shared/watch/watch.h
@@ -67,7 +67,7 @@ typedef void (*watch_cb_t)(void);
 #include "watch_tcc.h"
 #include "watch_adc.h"
 #include "watch_gpio.h"
-// #include "watch_i2c.h"
+#include "watch_i2c.h"
 #include "watch_spi.h"
 #include "watch_uart.h"
 #include "watch_storage.h"