1 files changed, 108 insertions, 0 deletions
diff --git a/watch-library/main.c b/watch-library/main.c
new file mode 100755
index 00000000..0d457b5f
--- /dev/null
+++ b/watch-library/main.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2021, Joey Castillo
+ * SAML22 starter project is Copyright (c) 2014-2017, Alex Taradov <alex@taradov.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+//-----------------------------------------------------------------------------
+#include <stdlib.h>
+#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"
+#include "app.h"
+
+//-----------------------------------------------------------------------------
+HAL_GPIO_PIN(UART_TX,   B, 0)
+HAL_GPIO_PIN(UART_RX,   B, 2)
+
+//-----------------------------------------------------------------------------
+static void uart_init(uint32_t baud) {
+    uint64_t br = (uint64_t)65536 * (CONF_CPU_FREQUENCY - 16 * baud) / CONF_CPU_FREQUENCY;
+
+    HAL_GPIO_UART_TX_out();
+    HAL_GPIO_UART_TX_pmuxen(HAL_GPIO_PMUX_C);
+    HAL_GPIO_UART_RX_in();
+    HAL_GPIO_UART_RX_pmuxen(HAL_GPIO_PMUX_C);
+
+    MCLK->APBCMASK.reg |= MCLK_APBCMASK_SERCOM3;
+
+    GCLK->PCHCTRL[SERCOM3_GCLK_ID_CORE].reg = GCLK_PCHCTRL_GEN(0) | GCLK_PCHCTRL_CHEN;
+    while (0 == (GCLK->PCHCTRL[SERCOM3_GCLK_ID_CORE].reg & GCLK_PCHCTRL_CHEN));
+
+    SERCOM3->USART.CTRLA.reg =
+        SERCOM_USART_CTRLA_DORD | SERCOM_USART_CTRLA_MODE(1/*USART_INT_CLK*/) |
+        SERCOM_USART_CTRLA_RXPO(0/*PAD0*/) | SERCOM_USART_CTRLA_TXPO(1/*PAD2*/);
+
+    SERCOM3->USART.CTRLB.reg = SERCOM_USART_CTRLB_RXEN | SERCOM_USART_CTRLB_TXEN |
+        SERCOM_USART_CTRLB_CHSIZE(0/*8 bits*/);
+
+    SERCOM3->USART.BAUD.reg = (uint16_t)br;
+
+    SERCOM3->USART.CTRLA.reg |= SERCOM_USART_CTRLA_ENABLE;
+}
+
+//-----------------------------------------------------------------------------
+void uart_putc(char c) {
+    while (!(SERCOM3->USART.INTFLAG.reg & SERCOM_USART_INTFLAG_DRE));
+    SERCOM3->USART.DATA.reg = c;
+}
+
+//-----------------------------------------------------------------------------
+void uart_puts(char *s) {
+    while (*s) uart_putc(*s++);
+}
+
+//-----------------------------------------------------------------------------
+static void sys_init(void) {
+    uart_puts("init_mcu\n");
+    init_mcu();
+    uart_puts("watch_init\n");
+    watch_init();
+    uart_puts("app_init\n");
+    app_init();
+}
+
+//-----------------------------------------------------------------------------
+int main(void) {
+    uart_init(115200);
+    sys_init();
+
+    while (1) {
+        app_loop();
+        app_prepare_for_sleep();
+        sleep(4);
+        app_wake_from_sleep();
+    }
+
+    return 0;
+}