lil i2c test

Sensor Watch Starter Project/hw/driver_init.c

@@ -0,0 +1,268 @@
+/*
+ * Code generated from Atmel Start.
+ *
+ * This file will be overwritten when reconfiguring your Atmel Start project.
+ * Please copy examples or other code you want to keep to a separate file
+ * to avoid losing it when reconfiguring.
+ */
+
+#include "driver_init.h"
+#include <peripheral_clk_config.h>
+#include <utils.h>
+#include <hal_init.h>
+
+#include <hpl_adc_base.h>
+
+struct slcd_sync_descriptor SEGMENT_LCD_0;
+
+struct adc_sync_descriptor ADC_0;
+
+struct calendar_descriptor CALENDAR_0;
+
+struct i2c_m_sync_desc I2C_0;
+
+struct pwm_descriptor PWM_0;
+
+struct pwm_descriptor PWM_1;
+
+void ADC_0_PORT_init(void)
+{
+
+	// Disable digital pin circuitry
+	gpio_set_pin_direction(A1, GPIO_DIRECTION_OFF);
+
+	gpio_set_pin_function(A1, PINMUX_PB01B_ADC_AIN9);
+
+	// Disable digital pin circuitry
+	gpio_set_pin_direction(A2, GPIO_DIRECTION_OFF);
+
+	gpio_set_pin_function(A2, PINMUX_PB02B_ADC_AIN10);
+
+	// Disable digital pin circuitry
+	gpio_set_pin_direction(A0, GPIO_DIRECTION_OFF);
+
+	gpio_set_pin_function(A0, PINMUX_PB04B_ADC_AIN12);
+}
+
+void ADC_0_CLOCK_init(void)
+{
+	hri_mclk_set_APBCMASK_ADC_bit(MCLK);
+	hri_gclk_write_PCHCTRL_reg(GCLK, ADC_GCLK_ID, CONF_GCLK_ADC_SRC | (1 << GCLK_PCHCTRL_CHEN_Pos));
+}
+
+void ADC_0_init(void)
+{
+	ADC_0_CLOCK_init();
+	ADC_0_PORT_init();
+	adc_sync_init(&ADC_0, ADC, (void *)NULL);
+}
+
+void EXTERNAL_IRQ_0_init(void)
+{
+	hri_gclk_write_PCHCTRL_reg(GCLK, EIC_GCLK_ID, CONF_GCLK_EIC_SRC | (1 << GCLK_PCHCTRL_CHEN_Pos));
+	hri_mclk_set_APBAMASK_EIC_bit(MCLK);
+
+	// Set pin direction to input
+	gpio_set_pin_direction(BTN_ALARM, GPIO_DIRECTION_IN);
+
+	gpio_set_pin_pull_mode(BTN_ALARM,
+	                       // <y> Pull configuration
+	                       // <id> pad_pull_config
+	                       // <GPIO_PULL_OFF"> Off
+	                       // <GPIO_PULL_UP"> Pull-up
+	                       // <GPIO_PULL_DOWN"> Pull-down
+	                       GPIO_PULL_DOWN);
+
+	gpio_set_pin_function(BTN_ALARM, PINMUX_PB05A_EIC_EXTINT5);
+
+	// Set pin direction to input
+	gpio_set_pin_direction(BTN_LIGHT, GPIO_DIRECTION_IN);
+
+	gpio_set_pin_pull_mode(BTN_LIGHT,
+	                       // <y> Pull configuration
+	                       // <id> pad_pull_config
+	                       // <GPIO_PULL_OFF"> Off
+	                       // <GPIO_PULL_UP"> Pull-up
+	                       // <GPIO_PULL_DOWN"> Pull-down
+	                       GPIO_PULL_DOWN);
+
+	gpio_set_pin_function(BTN_LIGHT, PINMUX_PA22A_EIC_EXTINT6);
+
+	// Set pin direction to input
+	gpio_set_pin_direction(BTN_MODE, GPIO_DIRECTION_IN);
+
+	gpio_set_pin_pull_mode(BTN_MODE,
+	                       // <y> Pull configuration
+	                       // <id> pad_pull_config
+	                       // <GPIO_PULL_OFF"> Off
+	                       // <GPIO_PULL_UP"> Pull-up
+	                       // <GPIO_PULL_DOWN"> Pull-down
+	                       GPIO_PULL_DOWN);
+
+	gpio_set_pin_function(BTN_MODE, PINMUX_PA23A_EIC_EXTINT7);
+
+	ext_irq_init();
+}
+
+void CALENDAR_0_CLOCK_init(void)
+{
+	hri_mclk_set_APBAMASK_RTC_bit(MCLK);
+}
+
+void CALENDAR_0_init(void)
+{
+	CALENDAR_0_CLOCK_init();
+	calendar_init(&CALENDAR_0, RTC);
+}
+
+void I2C_0_PORT_init(void)
+{
+
+	gpio_set_pin_pull_mode(SDA,
+	                       // <y> Pull configuration
+	                       // <id> pad_pull_config
+	                       // <GPIO_PULL_OFF"> Off
+	                       // <GPIO_PULL_UP"> Pull-up
+	                       // <GPIO_PULL_DOWN"> Pull-down
+	                       GPIO_PULL_OFF);
+
+	gpio_set_pin_function(SDA, PINMUX_PB30C_SERCOM1_PAD0);
+
+	gpio_set_pin_pull_mode(SCL,
+	                       // <y> Pull configuration
+	                       // <id> pad_pull_config
+	                       // <GPIO_PULL_OFF"> Off
+	                       // <GPIO_PULL_UP"> Pull-up
+	                       // <GPIO_PULL_DOWN"> Pull-down
+	                       GPIO_PULL_OFF);
+
+	gpio_set_pin_function(SCL, PINMUX_PB31C_SERCOM1_PAD1);
+}
+
+void I2C_0_CLOCK_init(void)
+{
+	hri_gclk_write_PCHCTRL_reg(GCLK, SERCOM1_GCLK_ID_CORE, CONF_GCLK_SERCOM1_CORE_SRC | (1 << GCLK_PCHCTRL_CHEN_Pos));
+	hri_gclk_write_PCHCTRL_reg(GCLK, SERCOM1_GCLK_ID_SLOW, CONF_GCLK_SERCOM1_SLOW_SRC | (1 << GCLK_PCHCTRL_CHEN_Pos));
+	hri_mclk_set_APBCMASK_SERCOM1_bit(MCLK);
+}
+
+void I2C_0_init(void)
+{
+	I2C_0_CLOCK_init();
+	i2c_m_sync_init(&I2C_0, SERCOM1);
+	I2C_0_PORT_init();
+}
+
+void delay_driver_init(void)
+{
+	delay_init(SysTick);
+}
+
+void PWM_0_PORT_init(void)
+{
+
+	gpio_set_pin_function(RED, PINMUX_PA20E_TC3_WO0);
+
+	gpio_set_pin_function(GREEN, PINMUX_PA21E_TC3_WO1);
+}
+
+void PWM_0_CLOCK_init(void)
+{
+	hri_mclk_set_APBCMASK_TC3_bit(MCLK);
+	hri_gclk_write_PCHCTRL_reg(GCLK, TC3_GCLK_ID, CONF_GCLK_TC3_SRC | (1 << GCLK_PCHCTRL_CHEN_Pos));
+}
+
+void PWM_0_init(void)
+{
+	PWM_0_CLOCK_init();
+	PWM_0_PORT_init();
+	pwm_init(&PWM_0, TC3, _tc_get_pwm());
+}
+
+void PWM_1_PORT_init(void)
+{
+
+	gpio_set_pin_function(BUZZER, PINMUX_PA27F_TCC0_WO5);
+}
+
+void PWM_1_CLOCK_init(void)
+{
+	hri_mclk_set_APBCMASK_TCC0_bit(MCLK);
+	hri_gclk_write_PCHCTRL_reg(GCLK, TCC0_GCLK_ID, CONF_GCLK_TCC0_SRC | (1 << GCLK_PCHCTRL_CHEN_Pos));
+}
+
+void PWM_1_init(void)
+{
+	PWM_1_CLOCK_init();
+	PWM_1_PORT_init();
+	pwm_init(&PWM_1, TCC0, _tcc_get_pwm());
+}
+
+void SEGMENT_LCD_0_PORT_init(void)
+{
+
+	gpio_set_pin_function(COM0, PINMUX_PB06B_SLCD_LP0);
+
+	gpio_set_pin_function(COM1, PINMUX_PB07B_SLCD_LP1);
+
+	gpio_set_pin_function(COM2, PINMUX_PB08B_SLCD_LP2);
+
+	gpio_set_pin_function(SEG0, PINMUX_PB09B_SLCD_LP3);
+
+	gpio_set_pin_function(SEG1, PINMUX_PA04B_SLCD_LP4);
+
+	gpio_set_pin_function(SEG2, PINMUX_PA05B_SLCD_LP5);
+
+	gpio_set_pin_function(SEG3, PINMUX_PA06B_SLCD_LP6);
+
+	gpio_set_pin_function(SEG4, PINMUX_PA07B_SLCD_LP7);
+
+	gpio_set_pin_function(SEG5, PINMUX_PA08B_SLCD_LP11);
+
+	gpio_set_pin_function(SEG6, PINMUX_PA09B_SLCD_LP12);
+
+	gpio_set_pin_function(SEG7, PINMUX_PA10B_SLCD_LP13);
+
+	gpio_set_pin_function(SEG8, PINMUX_PA11B_SLCD_LP14);
+
+	gpio_set_pin_function(SEG9, PINMUX_PB11B_SLCD_LP21);
+
+	gpio_set_pin_function(SEG10, PINMUX_PB12B_SLCD_LP22);
+
+	gpio_set_pin_function(SEG11, PINMUX_PB13B_SLCD_LP23);
+
+	gpio_set_pin_function(SEG12, PINMUX_PB14B_SLCD_LP24);
+
+	gpio_set_pin_function(SEG13, PINMUX_PB15B_SLCD_LP25);
+
+	gpio_set_pin_function(SEG14, PINMUX_PA12B_SLCD_LP28);
+
+	gpio_set_pin_function(SEG15, PINMUX_PA13B_SLCD_LP29);
+
+	gpio_set_pin_function(SEG16, PINMUX_PA14B_SLCD_LP30);
+
+	gpio_set_pin_function(SEG17, PINMUX_PA15B_SLCD_LP31);
+
+	gpio_set_pin_function(SEG18, PINMUX_PA16B_SLCD_LP32);
+
+	gpio_set_pin_function(SEG19, PINMUX_PA17B_SLCD_LP33);
+
+	gpio_set_pin_function(SEG20, PINMUX_PA18B_SLCD_LP34);
+
+	gpio_set_pin_function(SEG21, PINMUX_PA19B_SLCD_LP35);
+
+	gpio_set_pin_function(SEG22, PINMUX_PB16B_SLCD_LP42);
+
+	gpio_set_pin_function(SEG23, PINMUX_PB17B_SLCD_LP43);
+}
+/**
+ * \brief SLCD initialization function
+ *
+ * Enables SLCD peripheral, clocks and initializes SLCD driver
+ */
+void SEGMENT_LCD_0_init(void)
+{
+	hri_mclk_set_APBCMASK_SLCD_bit(SLCD);
+	slcd_sync_init(&SEGMENT_LCD_0, SLCD);
+	SEGMENT_LCD_0_PORT_init();
+}

Sensor Watch Starter Project/hw/watch.c

@@ -0,0 +1,303 @@
+/*
+ * watch.c
+ *
+ * Created: 4/25/2021 10:22:10 AM
+ *  Author: joeycastillo
+ */ 
+
+#include "watch.h"
+#include <stdlib.h>
+#include <string.h>
+
+void watch_init(Watch *watch) {
+	memset(watch, 0, sizeof(*watch));
+	// use switching regulator
+	SUPC->VREG.bit.SEL = 1;
+	while(!SUPC->STATUS.bit.VREGRDY);
+	// TODO: use performance level 0
+//	_set_performance_level(0);
+//	hri_pm_write_PLCFG_PLDIS_bit(PM, true);
+}
+
+const uint8_t Character_Set[] =
+{
+    0b00000000, //  
+    0b00000000, // !
+    0b00100010, // "
+    0b00000000, // #
+    0b00000000, // $
+    0b00000000, // %
+    0b01000100, // &
+    0b00100000, // '
+    0b00000000, // (
+    0b00000000, // )
+    0b00000000, // *
+    0b11000000, // +
+    0b00010000, // ,
+    0b01000000, // -
+    0b00000100, // .
+    0b00010010, // /
+    0b00111111, // 0
+    0b00000110, // 1
+    0b01011011, // 2
+    0b01001111, // 3
+    0b01100110, // 4
+    0b01101101, // 5
+    0b01111101, // 6
+    0b00000111, // 7
+    0b01111111, // 8
+    0b01101111, // 9
+    0b00000000, // :
+    0b00000000, // ;
+    0b01011000, // <
+    0b01001000, // =
+    0b01001100, // >
+    0b01010011, // ?
+    0b11111111, // @
+    0b01110111, // A
+    0b01111111, // B
+    0b00111001, // C
+    0b00111111, // D
+    0b01111001, // E
+    0b01110001, // F
+    0b00111101, // G
+    0b01110110, // H
+    0b10001001, // I
+    0b00001110, // J
+    0b11101010, // K
+    0b00111000, // L
+    0b10110111, // M
+    0b00110111, // N
+    0b00111111, // O
+    0b01110011, // P
+    0b01100111, // Q
+    0b11110111, // R
+    0b01101101, // S
+    0b10000001, // T
+    0b00111110, // U
+    0b00111110, // V
+    0b10111110, // W
+    0b01111110, // X
+    0b01101110, // Y
+    0b00011011, // Z
+    0b00111001, // [
+    0b00100100, // backslash
+    0b00001111, // ]
+    0b00100110, // ^
+    0b00001000, // _
+    0b00000010, // `
+    0b01011111, // a
+    0b01111100, // b
+    0b01011000, // c
+    0b01011110, // d
+    0b01111011, // e
+    0b01110001, // f
+    0b01101111, // g
+    0b01110100, // h
+    0b00010000, // i
+    0b01000010, // j
+    0b11101010, // k
+    0b00110000, // l
+    0b10110111, // m
+    0b01010100, // n
+    0b01011100, // o
+    0b01110011, // p
+    0b01100111, // q
+    0b01010000, // r
+    0b01101101, // s
+    0b01111000, // t
+    0b01100010, // u
+    0b01100010, // v
+    0b10111110, // w
+    0b01111110, // x
+    0b01101110, // y
+    0b00011011, // z
+    0b00111001, // {
+    0b00110000, // |
+    0b00001111, // }
+    0b00000001, // ~
+};
+
+void watch_enable_display(Watch *watch) {
+	if (watch->display_enabled) return;
+
+	static const uint64_t segmap[] = {
+		0x4e4f0e8e8f8d4d0d, // Position 8
+		0xc8c4c4c8b4b4b0b,  // Position 9
+		0xc049c00a49890949, // Position 6
+		0xc048088886874707, // Position 7
+		0xc053921252139352, // Position 0
+		0xc054511415559594, // Position 1
+		0xc057965616179716, // Position 2
+		0xc041804000018a81, // Position 3
+		0xc043420203048382, // Position 4
+		0xc045440506468584, // Position 5
+	};
+	watch->num_chars = 10;
+	watch->segment_map = &segmap[0];
+
+	SEGMENT_LCD_0_init();
+	slcd_sync_enable(&SEGMENT_LCD_0);
+	watch->display_enabled = true;
+}
+
+void watch_display_pixel(Watch *watch, uint8_t com, uint8_t seg) {
+	slcd_sync_seg_on(&SEGMENT_LCD_0, SLCD_SEGID(com, seg));
+}
+
+void watch_clear_pixel(Watch *watch, uint8_t com, uint8_t seg) {
+	slcd_sync_seg_off(&SEGMENT_LCD_0, SLCD_SEGID(com, seg));
+}
+
+void watch_display_character(Watch *watch, uint8_t character, uint8_t position) {
+	uint64_t segmap = watch->segment_map[position];
+	uint64_t segdata = Character_Set[character - 0x20];
+
+	for (int i = 0; i < 8; i++) {
+		uint8_t com = (segmap & 0xFF) >> 6;
+		if (com > 2) {
+			// COM3 means no segment exists; skip it.
+			segmap = segmap >> 8;
+			segdata = segdata >> 1;
+			continue;
+		}
+		uint8_t seg = segmap & 0x3F;
+		slcd_sync_seg_off(&SEGMENT_LCD_0, SLCD_SEGID(com, seg));
+		if (segdata & 1) slcd_sync_seg_on(&SEGMENT_LCD_0, SLCD_SEGID(com, seg));
+		segmap = segmap >> 8;
+		segdata = segdata >> 1;
+	}
+}
+
+void watch_display_string(Watch *watch, char *string, uint8_t position) {
+	size_t i = 0;
+	while(string[i] != 0) {
+		watch_display_character(watch, string[i], position + i);
+		i++;
+		if (i >= watch->num_chars) break;
+	}
+}
+
+void watch_enable_buttons(Watch *watch) {
+	EXTERNAL_IRQ_0_init();
+}
+
+void watch_register_button_callback(Watch *watch, const uint32_t pin, ext_irq_cb_t callback) {
+	ext_irq_register(pin, callback);
+}
+
+void watch_enable_led(Watch *watch) {
+	if (watch->led_enabled) return;
+
+	PWM_0_init();
+	pwm_set_parameters(&PWM_0, 10000, 0);
+	pwm_enable(&PWM_0);
+	
+	watch->led_enabled = true;
+	watch_set_led_off();
+}
+
+void watch_disable_led(Watch *watch) {
+	if (!watch->led_enabled) return;
+
+	gpio_set_pin_function(RED, GPIO_PIN_FUNCTION_OFF);
+	gpio_set_pin_function(GREEN, GPIO_PIN_FUNCTION_OFF);
+
+	pwm_disable(&PWM_0);
+	
+	watch->led_enabled = false;
+}
+
+void watch_set_led_color(uint16_t red, uint16_t green) {
+	TC3->COUNT16.CC[0].reg = red;
+	TC3->COUNT16.CC[1].reg = green;
+}
+
+void watch_set_led_red() {
+	watch_set_led_color(65535, 0);
+}
+
+void watch_set_led_green() {
+	watch_set_led_color(0, 65535);
+}
+
+void watch_set_led_off() {
+	watch_set_led_color(0, 0);
+}
+
+void watch_enable_date_time(Watch *watch) {
+	if (watch->calendar_enabled) return;
+	CALENDAR_0_init();
+	calendar_enable(&CALENDAR_0);
+	
+	watch->calendar_enabled = true;
+}
+
+void watch_set_date_time(struct calendar_date_time date_time) {
+	calendar_set_date(&CALENDAR_0, &date_time.date);
+	calendar_set_time(&CALENDAR_0, &date_time.time);
+}
+
+void watch_get_date_time(struct calendar_date_time *date_time) {
+	calendar_get_date_time(&CALENDAR_0, date_time);
+}
+
+static ext_irq_cb_t tick_user_callback;
+
+static void tick_callback(struct calendar_dev *const dev) {
+	tick_user_callback();
+}
+
+void watch_enable_tick(ext_irq_cb_t callback) {
+	tick_user_callback = callback;
+	// TODO: rename this method to reflect that it now sets the PER7 interrupt.
+	_tamper_register_callback(&CALENDAR_0.device, &tick_callback);
+}
+
+void watch_enable_analog(Watch *watch, const uint8_t pin) {
+	if (!watch->adc_enabled) ADC_0_init();
+
+	switch (pin) {
+		case A0:
+			gpio_set_pin_function(A0, PINMUX_PB04B_ADC_AIN12);
+			break;
+		case A1:
+			gpio_set_pin_function(A1, PINMUX_PB01B_ADC_AIN9);
+			break;
+		case A2:
+			gpio_set_pin_function(A2, PINMUX_PB02B_ADC_AIN10);
+			break;
+		default:
+			return;
+	}
+	gpio_set_pin_direction(pin, GPIO_DIRECTION_OFF);
+}
+
+void watch_enable_digital_input(const uint8_t pin) {
+	gpio_set_pin_direction(pin, GPIO_DIRECTION_IN);
+	gpio_set_pin_function(pin, GPIO_PIN_FUNCTION_OFF);
+}
+
+void watch_enable_digital_output(const uint8_t pin) {
+	gpio_set_pin_direction(pin, GPIO_DIRECTION_OUT);
+	gpio_set_pin_function(pin, GPIO_PIN_FUNCTION_OFF);
+}
+
+struct io_descriptor *I2C_0_io;
+
+void watch_enable_i2c(Watch *watch) {
+	if (watch->i2c_enabled) return;
+	I2C_0_init();
+	i2c_m_sync_get_io_descriptor(&I2C_0, &I2C_0_io);
+	i2c_m_sync_enable(&I2C_0);
+}
+
+void watch_i2c_send(int16_t addr, uint8_t *buf, uint16_t length) {
+	i2c_m_sync_set_slaveaddr(&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_slaveaddr(&I2C_0, addr, I2C_M_SEVEN);
+	io_read(I2C_0_io, buf, length);
+}

Sensor Watch Starter Project/hw/watch.h

@@ -0,0 +1,63 @@
+/*
+ * Watch.h
+ *
+ * Created: 4/25/2021 8:29:16 AM
+ *  Author: joeycastillo
+ */ 
+
+
+#ifndef WATCH_H_
+#define WATCH_H_
+#include <stdint.h>
+#include "driver_init.h"
+#include "hpl_calendar.h"
+#include "hal_ext_irq.h"
+
+typedef struct Watch {
+	bool display_enabled;
+	bool led_enabled;
+	bool buzzer_enabled;
+	bool calendar_enabled;
+	bool adc_enabled;
+	bool i2c_enabled;
+	bool spi_enabled;
+	bool eic_enabled;
+
+	uint8_t num_chars;
+	const uint64_t* segment_map;
+} Watch;
+
+void watch_init(Watch *watch);
+
+void watch_enable_display(Watch *watch);
+void watch_display_pixel(Watch *watch, uint8_t com, uint8_t seg);
+void watch_display_string(Watch *watch, char *string, uint8_t position);
+
+void watch_enable_led(Watch *watch);
+void watch_disable_led(Watch *watch);
+void watch_set_led_color(uint16_t red, uint16_t green);
+void watch_set_led_red();
+void watch_set_led_green();
+void watch_set_led_off();
+
+void watch_enable_date_time(Watch *watch);
+void watch_set_date_time(struct calendar_date_time date_time);
+void watch_get_date_time(struct calendar_date_time *date_time);
+
+void watch_enable_tick(ext_irq_cb_t callback);
+
+void watch_enable_analog(Watch *watch, const uint8_t pin);
+
+void watch_enable_buttons(Watch *watch);
+void watch_register_button_callback(Watch *watch, const uint32_t pin, ext_irq_cb_t callback);
+
+void watch_enable_digital_input(const uint8_t pin);
+void watch_enable_digital_output(const uint8_t pin);
+
+struct io_descriptor *I2C_0_io;
+
+void watch_enable_i2c(Watch *watch);
+void watch_i2c_send(int16_t addr, uint8_t *buf, uint16_t length);
+void watch_i2c_receive(int16_t addr, uint8_t *buf, uint16_t length);
+
+#endif /* WATCH_H_ */

Sensor Watch Starter Project/main.c

@@ -32,16 +32,20 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include <string.h>
+#include <stdio.h>
 #include "saml22.h"
 #include "hal_init.h"
 #include "peripheral_clk_config.h"
 #include "hal_gpio.h"
+#include "atmel_start_pins.h"
+#include "watch.h"
 
 //-----------------------------------------------------------------------------
-HAL_GPIO_PIN(LED,       A, 21)
 HAL_GPIO_PIN(UART_TX,   B, 0)
 HAL_GPIO_PIN(UART_RX,   B, 2)
 
+Watch watch;
+
 //-----------------------------------------------------------------------------
 static void uart_init(uint32_t baud) {
     uint64_t br = (uint64_t)65536 * (CONF_CPU_FREQUENCY - 16 * baud) / CONF_CPU_FREQUENCY;
@@ -82,19 +86,39 @@ static void uart_puts(char *s) {
 //-----------------------------------------------------------------------------
 static void sys_init(void) {
 	init_mcu();
+    watch_init(&watch);
+    watch_enable_display(&watch);
+    watch_enable_led(&watch);
+    watch_enable_date_time(&watch);
+    watch_enable_analog(&watch, A0);
+    watch_enable_buttons(&watch);
+    watch_enable_i2c(&watch);
 }
 
 //-----------------------------------------------------------------------------
 int main(void) {
     sys_init();
     uart_init(115200);
-    HAL_GPIO_LED_out();
-    HAL_GPIO_LED_set();
 
-    uart_puts("\r\nHello, world!\r\n");
+    char buf[20] = {0};
 
+    uart_puts("\n\nI2C Driver Test\n");
+	uint8_t reset_cmd[] = {0xE0, 0xB6};
+	watch_i2c_send(0x77, reset_cmd, 2);
+    uart_puts("Reset BMP280\n");
+	uint8_t chip_id_cmd = 0xD0;
+	uint8_t chip_id = 0;
+	watch_i2c_send(0x77, &chip_id_cmd, 1);
+    uart_puts("Chip ID... ");
+	watch_i2c_receive(0x77, &chip_id, 1);
+    uart_puts("received!\n");
+    sprintf(buf, "Chip ID is %#02x", chip_id);
+    uart_puts(buf);
+    uart_puts("\nDone\n");
+
+    uint16_t red = 0;
+    uint16_t green = 0;
     while (1) {
-        uart_putc('.');
     }
 
     return 0;

Sensor Watch Starter Project/make/Makefile

@@ -61,6 +61,8 @@ INCLUDES += \
 SRCS += \
   ../main.c \
   ../startup_saml22.c \
+  ../hw/driver_init.c \
+  ../hw/watch.c \
   ../hal/src/hal_adc_sync.c \
   ../hal/src/hal_atomic.c \
   ../hal/src/hal_calendar.c \