Sensor Watch Simulator (#35)

* Put something on screen

* Use the 32bit watch_date_time repr to pass from JS

* Implement periodic callbacks

* Clear display on enabling

* Hook up watch_set_led_color() to SVG (green-only)

* Make debug output full-width

* Remove default Emscripten canvas

* Implement sleep and button clicks

* Fix time zone conversion bug in beats-time app

* Clean up warnings

* Fix pin levels

* Set time zone to browser value (if available)

* Add basic backup data saving

* Silence format specifier warnings in both targets

* Remove unnecessary, copied files

* Use RTC pointer to clear callbacks (if available)

* Use preprocessor define to avoid hardcoding MOVEMENT_NUM_FACES

* Change each face to const preprocessor definition

* Remove Intl.DateTimeFormat usage

* Update shell.html title, header

* Add touch start/end event handlers on SVG buttons

* Update shell.html

* Update folder structure (shared, simulator, hardware under watch-library)

* Tease out shared components from watch_slcd

* Clean up simulator watch_slcd.c inline JS calls

* Fix missing newlines at end of file

* Add simulator warnings (except format, unused-paremter)

* Implement remaining watch_rtc functions

* Fix button bug on mouse down then drag out

* Implement remaining watch_slcd functions

* Link keyboard events to buttons (for keys A, L, M)

* Rewrite event handling (mouse, touch, keyboard) in C

* Set explicit text UTF-8 charset in shell.html

* Address PR comments

* Remove unused directories from include paths

1 files changed, 93 insertions, 0 deletions

diff --git a/watch-library/hardware/watch/watch_i2c.c b/watch-library/hardware/watch/watch_i2c.c
new file mode 100644
index 00000000..ff20afc6
--- /dev/null
+++ b/watch-library/hardware/watch/watch_i2c.c
@@ -0,0 +1,93 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 Joey Castillo
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "watch_i2c.h"
+
+struct io_descriptor *I2C_0_io;
+
+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);
+}
+
+void watch_disable_i2c(void) {
+    i2c_m_sync_disable(&I2C_0);
+	hri_mclk_clear_APBCMASK_SERCOM1_bit(MCLK);
+}
+
+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);
+}
+
+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);
+}
+
+void watch_i2c_write8(int16_t addr, uint8_t reg, uint8_t data) {
+    uint8_t buf[2];
+    buf[0] = reg;
+    buf[1] = data;
+
+    watch_i2c_send(addr, (uint8_t *)&buf, 2);
+}
+
+uint8_t watch_i2c_read8(int16_t addr, uint8_t reg) {
+    uint8_t data;
+
+    watch_i2c_send(addr, (uint8_t *)&reg, 1);
+    watch_i2c_receive(addr, (uint8_t *)&data, 1);
+
+    return data;
+}
+
+uint16_t watch_i2c_read16(int16_t addr, uint8_t reg) {
+    uint16_t data;
+
+    watch_i2c_send(addr, (uint8_t *)&reg, 1);
+    watch_i2c_receive(addr, (uint8_t *)&data, 2);
+
+    return data;
+}
+
+uint32_t watch_i2c_read24(int16_t addr, uint8_t reg) {
+    uint32_t data;
+    data = 0;
+
+    watch_i2c_send(addr, (uint8_t *)&reg, 1);
+    watch_i2c_receive(addr, (uint8_t *)&data, 3);
+
+    return data << 8;
+}
+
+uint32_t watch_i2c_read32(int16_t addr, uint8_t reg) {
+    uint32_t data;
+
+    watch_i2c_send(addr, (uint8_t *)&reg, 1);
+    watch_i2c_receive(addr, (uint8_t *)&data, 4);
+
+    return data;
+}