本帖最后由 ddllxxrr 于 2014-12-16 18:26 编辑
ASF大家已经不莫生了,它是Atmel的编程库,但我发现很少用起来地,从今天开始,我就一步步从SAMD21这块板子跑起,
用8位定时器点LED先.
首先,选择新建ASF工程
然后点选开发板,注意了,不选开发板有些管脚还得重定义,比如LED0
选择手里的开发板
工程名字可心默认,也可自己改名,然后选择我建的工程名:
这时ASF向导出现了.
选则TC回调函数方式:
然后点选APPLY,这时用ASF exploer 可以选则快速开始那一项,则按照网页的提示把代码搞好.
现注意改一下时钟设置,这个是关键也是同STM32不同的地方
以下是主程序:
- #include <asf.h>
- void configure_tc(void);
- void configure_tc_callbacks(void);
- void tc_callback_to_toggle_led(
- struct tc_module *const module_inst);
- //! [module_inst]
- struct tc_module tc_instance;
- //! [module_inst]
- //! [callback_funcs]
- void tc_callback_to_toggle_led(
- struct tc_module *const module_inst)
- {
- port_pin_toggle_output_level(LED0_PIN);
- }
- //! [callback_funcs]
- //! [setup]
- void configure_tc(void)
- {
- //! [setup_config]
- struct tc_config config_tc;
- //! [setup_config]
- //! [setup_config_defaults]
- tc_get_config_defaults(&config_tc);
- //! [setup_config_defaults]
- //! [setup_change_config]
- config_tc.counter_size = TC_COUNTER_SIZE_8BIT;
- config_tc.clock_source = GCLK_GENERATOR_1;
- config_tc.clock_prescaler = TC_CLOCK_PRESCALER_DIV1024;
- config_tc.counter_8_bit.period = 100;
- config_tc.counter_8_bit.compare_capture_channel[0] = 50;
- config_tc.counter_8_bit.compare_capture_channel[1] = 54;
- //! [setup_change_config]
- //! [setup_set_config]
- tc_init(&tc_instance, TC3, &config_tc);
- //! [setup_set_config]
- //! [setup_enable]
- tc_enable(&tc_instance);
- //! [setup_enable]
- }
- void configure_tc_callbacks(void)
- {
- //! [setup_register_callback]
- tc_register_callback(&tc_instance, tc_callback_to_toggle_led,
- TC_CALLBACK_OVERFLOW);
- //tc_register_callback(&tc_instance, tc_callback_to_toggle_led,
- // TC_CALLBACK_CC_CHANNEL0);
- //tc_register_callback(&tc_instance, tc_callback_to_toggle_led,
- // TC_CALLBACK_CC_CHANNEL1);
- //! [setup_register_callback]
- //! [setup_enable_callback]
- tc_enable_callback(&tc_instance, TC_CALLBACK_OVERFLOW);
- //tc_enable_callback(&tc_instance, TC_CALLBACK_CC_CHANNEL0);
- //tc_enable_callback(&tc_instance, TC_CALLBACK_CC_CHANNEL1);
- //! [setup_enable_callback]
- }
- //! [setup]
- int main(void)
- {
- system_init();
- //! [setup_init]
- configure_tc();
- configure_tc_callbacks();
- //! [setup_init]
- //! [main]
- //! [enable_global_interrupts]
- system_interrupt_enable_global();
- //! [enable_global_interrupts]
- //! [main_loop]
- while (true) {
- }
- //! [main_loop]
- //! [main]
- }
时钟配置:
- /**
- * \file
- *
- * \brief SAM D21 Clock configuration
- *
- * Copyright (C) 2013-2014 Atmel Corporation. All rights reserved.
- *
- * \asf_license_start
- *
- * \page License
- *
- * 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 Atmel may not be used to endorse or promote products derived
- * from this software without specific prior written permission.
- *
- * 4. This software may only be redistributed and used in connection with an
- * Atmel microcontroller product.
- *
- * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
- * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL 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.
- *
- * \asf_license_stop
- *
- */
- #include <clock.h>
- #ifndef CONF_CLOCKS_H_INCLUDED
- # define CONF_CLOCKS_H_INCLUDED
- /* System clock bus configuration */
- # define CONF_CLOCK_CPU_CLOCK_FAILURE_DETECT false
- # define CONF_CLOCK_FLASH_WAIT_STATES 0
- # define CONF_CLOCK_CPU_DIVIDER SYSTEM_MAIN_CLOCK_DIV_1
- # define CONF_CLOCK_APBA_DIVIDER SYSTEM_MAIN_CLOCK_DIV_1
- # define CONF_CLOCK_APBB_DIVIDER SYSTEM_MAIN_CLOCK_DIV_1
- /* SYSTEM_CLOCK_SOURCE_OSC8M configuration - Internal 8MHz oscillator */
- # define CONF_CLOCK_OSC8M_PRESCALER SYSTEM_OSC8M_DIV_1
- # define CONF_CLOCK_OSC8M_ON_DEMAND true
- # define CONF_CLOCK_OSC8M_RUN_IN_STANDBY false
- /* SYSTEM_CLOCK_SOURCE_XOSC configuration - External clock/oscillator */
- # define CONF_CLOCK_XOSC_ENABLE false
- # define CONF_CLOCK_XOSC_EXTERNAL_CRYSTAL SYSTEM_CLOCK_EXTERNAL_CRYSTAL
- # define CONF_CLOCK_XOSC_EXTERNAL_FREQUENCY 12000000UL
- # define CONF_CLOCK_XOSC_STARTUP_TIME SYSTEM_XOSC_STARTUP_32768
- # define CONF_CLOCK_XOSC_AUTO_GAIN_CONTROL true
- # define CONF_CLOCK_XOSC_ON_DEMAND true
- # define CONF_CLOCK_XOSC_RUN_IN_STANDBY false
- /* SYSTEM_CLOCK_SOURCE_XOSC32K configuration - External 32KHz crystal/clock oscillator */
- # define CONF_CLOCK_XOSC32K_ENABLE false
- # define CONF_CLOCK_XOSC32K_EXTERNAL_CRYSTAL SYSTEM_CLOCK_EXTERNAL_CRYSTAL
- # define CONF_CLOCK_XOSC32K_STARTUP_TIME SYSTEM_XOSC32K_STARTUP_65536
- # define CONF_CLOCK_XOSC32K_AUTO_AMPLITUDE_CONTROL false
- # define CONF_CLOCK_XOSC32K_ENABLE_1KHZ_OUPUT false
- # define CONF_CLOCK_XOSC32K_ENABLE_32KHZ_OUTPUT true
- # define CONF_CLOCK_XOSC32K_ON_DEMAND true
- # define CONF_CLOCK_XOSC32K_RUN_IN_STANDBY false
- /* SYSTEM_CLOCK_SOURCE_OSC32K configuration - Internal 32KHz oscillator */
- # define CONF_CLOCK_OSC32K_ENABLE false
- # define CONF_CLOCK_OSC32K_STARTUP_TIME SYSTEM_OSC32K_STARTUP_130
- # define CONF_CLOCK_OSC32K_ENABLE_1KHZ_OUTPUT true
- # define CONF_CLOCK_OSC32K_ENABLE_32KHZ_OUTPUT true
- # define CONF_CLOCK_OSC32K_ON_DEMAND true
- # define CONF_CLOCK_OSC32K_RUN_IN_STANDBY false
- /* SYSTEM_CLOCK_SOURCE_DFLL configuration - Digital Frequency Locked Loop */
- # define CONF_CLOCK_DFLL_ENABLE false
- # define CONF_CLOCK_DFLL_LOOP_MODE SYSTEM_CLOCK_DFLL_LOOP_MODE_OPEN
- # define CONF_CLOCK_DFLL_ON_DEMAND false
- /* DFLL open loop mode configuration */
- # define CONF_CLOCK_DFLL_COARSE_VALUE (0x1f / 4)
- # define CONF_CLOCK_DFLL_FINE_VALUE (0xff / 4)
- /* DFLL closed loop mode configuration */
- # define CONF_CLOCK_DFLL_SOURCE_GCLK_GENERATOR GCLK_GENERATOR_1
- # define CONF_CLOCK_DFLL_MULTIPLY_FACTOR 6
- # define CONF_CLOCK_DFLL_QUICK_LOCK true
- # define CONF_CLOCK_DFLL_TRACK_AFTER_FINE_LOCK true
- # define CONF_CLOCK_DFLL_KEEP_LOCK_ON_WAKEUP true
- # define CONF_CLOCK_DFLL_ENABLE_CHILL_CYCLE true
- # define CONF_CLOCK_DFLL_MAX_COARSE_STEP_SIZE (0x1f / 4)
- # define CONF_CLOCK_DFLL_MAX_FINE_STEP_SIZE (0xff / 4)
- /* SYSTEM_CLOCK_SOURCE_DPLL configuration - Digital Phase-Locked Loop */
- # define CONF_CLOCK_DPLL_ENABLE false
- # define CONF_CLOCK_DPLL_ON_DEMAND true
- # define CONF_CLOCK_DPLL_RUN_IN_STANDBY false
- # define CONF_CLOCK_DPLL_LOCK_BYPASS false
- # define CONF_CLOCK_DPLL_WAKE_UP_FAST false
- # define CONF_CLOCK_DPLL_LOW_POWER_ENABLE false
- # define CONF_CLOCK_DPLL_LOCK_TIME SYSTEM_CLOCK_SOURCE_DPLL_LOCK_TIME_NO_TIMEOUT
- # define CONF_CLOCK_DPLL_REFERENCE_CLOCK SYSTEM_CLOCK_SOURCE_DPLL_REFERENCE_CLOCK_REF0
- # define CONF_CLOCK_DPLL_FILTER SYSTEM_CLOCK_SOURCE_DPLL_FILTER_DEFAULT
- # define CONF_CLOCK_DPLL_REFERENCE_FREQUENCY 32768
- # define CONF_CLOCK_DPLL_REFEREMCE_DIVIDER 1
- # define CONF_CLOCK_DPLL_OUTPUT_FREQUENCY 48000000
- /* Set this to true to configure the GCLK when running clocks_init. If set to
- * false, none of the GCLK generators will be configured in clocks_init(). */
- # define CONF_CLOCK_CONFIGURE_GCLK true
- /* Configure GCLK generator 0 (Main Clock) */
- # define CONF_CLOCK_GCLK_0_ENABLE true
- # define CONF_CLOCK_GCLK_0_RUN_IN_STANDBY false
- # define CONF_CLOCK_GCLK_0_CLOCK_SOURCE SYSTEM_CLOCK_SOURCE_OSC8M
- # define CONF_CLOCK_GCLK_0_PRESCALER 1
- # define CONF_CLOCK_GCLK_0_OUTPUT_ENABLE false
- /* Configure GCLK generator 1 */
- # define CONF_CLOCK_GCLK_1_ENABLE true
- # define CONF_CLOCK_GCLK_1_RUN_IN_STANDBY false
- # define CONF_CLOCK_GCLK_1_CLOCK_SOURCE SYSTEM_CLOCK_SOURCE_OSC8M
- # define CONF_CLOCK_GCLK_1_PRESCALER 1
- # define CONF_CLOCK_GCLK_1_OUTPUT_ENABLE false
- /* Configure GCLK generator 2 (RTC) */
- # define CONF_CLOCK_GCLK_2_ENABLE false
- # define CONF_CLOCK_GCLK_2_RUN_IN_STANDBY false
- # define CONF_CLOCK_GCLK_2_CLOCK_SOURCE SYSTEM_CLOCK_SOURCE_OSC32K
- # define CONF_CLOCK_GCLK_2_PRESCALER 32
- # define CONF_CLOCK_GCLK_2_OUTPUT_ENABLE false
- /* Configure GCLK generator 3 */
- # define CONF_CLOCK_GCLK_3_ENABLE false
- # define CONF_CLOCK_GCLK_3_RUN_IN_STANDBY false
- # define CONF_CLOCK_GCLK_3_CLOCK_SOURCE SYSTEM_CLOCK_SOURCE_OSC8M
- # define CONF_CLOCK_GCLK_3_PRESCALER 1
- # define CONF_CLOCK_GCLK_3_OUTPUT_ENABLE false
- /* Configure GCLK generator 4 */
- # define CONF_CLOCK_GCLK_4_ENABLE false
- # define CONF_CLOCK_GCLK_4_RUN_IN_STANDBY false
- # define CONF_CLOCK_GCLK_4_CLOCK_SOURCE SYSTEM_CLOCK_SOURCE_OSC8M
- # define CONF_CLOCK_GCLK_4_PRESCALER 1
- # define CONF_CLOCK_GCLK_4_OUTPUT_ENABLE false
- /* Configure GCLK generator 5 */
- # define CONF_CLOCK_GCLK_5_ENABLE false
- # define CONF_CLOCK_GCLK_5_RUN_IN_STANDBY false
- # define CONF_CLOCK_GCLK_5_CLOCK_SOURCE SYSTEM_CLOCK_SOURCE_OSC8M
- # define CONF_CLOCK_GCLK_5_PRESCALER 1
- # define CONF_CLOCK_GCLK_5_OUTPUT_ENABLE false
- /* Configure GCLK generator 6 */
- # define CONF_CLOCK_GCLK_6_ENABLE false
- # define CONF_CLOCK_GCLK_6_RUN_IN_STANDBY false
- # define CONF_CLOCK_GCLK_6_CLOCK_SOURCE SYSTEM_CLOCK_SOURCE_OSC8M
- # define CONF_CLOCK_GCLK_6_PRESCALER 1
- # define CONF_CLOCK_GCLK_6_OUTPUT_ENABLE false
- /* Configure GCLK generator 7 */
- # define CONF_CLOCK_GCLK_7_ENABLE false
- # define CONF_CLOCK_GCLK_7_RUN_IN_STANDBY false
- # define CONF_CLOCK_GCLK_7_CLOCK_SOURCE SYSTEM_CLOCK_SOURCE_OSC8M
- # define CONF_CLOCK_GCLK_7_PRESCALER 1
- # define CONF_CLOCK_GCLK_7_OUTPUT_ENABLE false
- #endif /* CONF_CLOCKS_H_INCLUDED */
|