diff options
Diffstat (limited to 'Sensor Watch Starter Project/main.c')
| -rwxr-xr-x | Sensor Watch Starter Project/main.c | 173 |
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; +} |