move to a makefile based workflow

1 files changed, 173 insertions, 0 deletions

diff --git a/Sensor Watch Starter Project/main.c b/Sensor Watch Starter Project/main.c
new file mode 100755
index 00000000..844b3d88
--- /dev/null
+++ b/Sensor Watch Starter Project/main.c
@@ -0,0 +1,173 @@
+/*
+ * 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 "saml22.h"
+#include "hal_gpio.h"
+
+//-----------------------------------------------------------------------------
+#define PERIOD_FAST     100
+#define PERIOD_SLOW     500
+
+HAL_GPIO_PIN(LED,       A, 21)
+HAL_GPIO_PIN(BUTTON,    A, 30)
+HAL_GPIO_PIN(UART_TX,   A, 22)
+HAL_GPIO_PIN(UART_RX,   A, 23)
+
+//-----------------------------------------------------------------------------
+static void timer_set_period(uint16_t i)
+{
+  TC3->COUNT16.CC[0].reg = (F_CPU / 1000ul / 256) * i;
+  TC3->COUNT16.COUNT.reg = 0;
+}
+
+//-----------------------------------------------------------------------------
+void irq_handler_tc3(void)
+{
+  if (TC3->COUNT16.INTFLAG.reg & TC_INTFLAG_MC(1))
+  {
+    HAL_GPIO_LED_toggle();
+    TC3->COUNT16.INTFLAG.reg = TC_INTFLAG_MC(1);
+  }
+}
+
+//-----------------------------------------------------------------------------
+static void timer_init(void)
+{
+  MCLK->APBCMASK.reg |= MCLK_APBCMASK_TC3;
+
+  GCLK->PCHCTRL[TC3_GCLK_ID].reg = GCLK_PCHCTRL_GEN(0) | GCLK_PCHCTRL_CHEN;
+  while (0 == (GCLK->PCHCTRL[TC3_GCLK_ID].reg & GCLK_PCHCTRL_CHEN));
+
+  TC3->COUNT16.CTRLA.reg = TC_CTRLA_MODE_COUNT16 | TC_CTRLA_PRESCALER(6/*DIV256*/) |
+      TC_CTRLA_PRESCSYNC_RESYNC;
+
+  TC3->COUNT16.WAVE.reg = TC_WAVE_WAVEGEN_MFRQ;
+
+  TC3->COUNT16.COUNT.reg = 0;
+
+  timer_set_period(PERIOD_SLOW);
+
+  TC3->COUNT16.CTRLA.reg |= TC_CTRLA_ENABLE;
+
+  TC3->COUNT16.INTENSET.reg = TC_INTENSET_MC(1);
+  NVIC_EnableIRQ(TC3_IRQn);
+}
+
+//-----------------------------------------------------------------------------
+static void uart_init(uint32_t baud)
+{
+  uint64_t br = (uint64_t)65536 * (F_CPU - 16 * baud) / F_CPU;
+
+  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_SERCOM0;
+
+  GCLK->PCHCTRL[SERCOM0_GCLK_ID_CORE].reg = GCLK_PCHCTRL_GEN(0) | GCLK_PCHCTRL_CHEN;
+  while (0 == (GCLK->PCHCTRL[SERCOM0_GCLK_ID_CORE].reg & GCLK_PCHCTRL_CHEN));
+
+  SERCOM0->USART.CTRLA.reg =
+      SERCOM_USART_CTRLA_DORD | SERCOM_USART_CTRLA_MODE(1/*USART_INT_CLK*/) |
+      SERCOM_USART_CTRLA_RXPO(3/*PAD3*/) | SERCOM_USART_CTRLA_TXPO(1/*PAD2*/);
+
+  SERCOM0->USART.CTRLB.reg = SERCOM_USART_CTRLB_RXEN | SERCOM_USART_CTRLB_TXEN |
+      SERCOM_USART_CTRLB_CHSIZE(0/*8 bits*/);
+
+  SERCOM0->USART.BAUD.reg = (uint16_t)br;
+
+  SERCOM0->USART.CTRLA.reg |= SERCOM_USART_CTRLA_ENABLE;
+}
+
+//-----------------------------------------------------------------------------
+static void uart_putc(char c)
+{
+  while (!(SERCOM0->USART.INTFLAG.reg & SERCOM_USART_INTFLAG_DRE));
+  SERCOM0->USART.DATA.reg = c;
+}
+
+//-----------------------------------------------------------------------------
+static void uart_puts(char *s)
+{
+  while (*s)
+    uart_putc(*s++);
+}
+
+//-----------------------------------------------------------------------------
+static void sys_init(void)
+{
+  // Switch to 16MHz clock (disable prescaler)
+  OSCCTRL->OSC16MCTRL.reg = OSCCTRL_OSC16MCTRL_ENABLE | OSCCTRL_OSC16MCTRL_FSEL_16;
+
+  // Switch to the highest performance level
+  PM->INTFLAG.reg = PM_INTFLAG_PLRDY;
+  PM->PLCFG.reg = PM_PLCFG_PLSEL_PL2_Val;
+  while (!PM->INTFLAG.reg);
+}
+
+//-----------------------------------------------------------------------------
+int main(void)
+{
+  uint32_t cnt = 0;
+  bool fast = false;
+
+  sys_init();
+  timer_init();
+  uart_init(115200);
+
+  uart_puts("\r\nHello, world!\r\n");
+
+  HAL_GPIO_LED_out();
+  HAL_GPIO_LED_clr();
+
+  HAL_GPIO_BUTTON_in();
+  HAL_GPIO_BUTTON_pullup();
+
+  while (1)
+  {
+    if (HAL_GPIO_BUTTON_read())
+      cnt = 0;
+    else if (cnt < 5001)
+      cnt++;
+
+    if (5000 == cnt)
+    {
+      fast = !fast;
+      timer_set_period(fast ? PERIOD_FAST : PERIOD_SLOW);
+      uart_putc('.');
+    }
+  }
+
+  return 0;
+}