本帖最后由 ddllxxrr 于 2014-12-31 22:52 编辑
上一篇是AC比较器不用回调函数实现的,这里用回调函数,在我看来回调函数就是一个不让你去写中断函数的机制。
首先ASF EXPLOER查下有AC模块点选在(CallbaCk)
其次打开快速指导的网页,
按照提示替换掉以前的函数。其实换完了就多了个void callback_function_ac(struct ac_module *const module_inst);
但有一点值得注意,网页指导可没有说明callback_status 这个变量是什么类型,编译后提示出错,我就想应该是8位的。
我就用了uint8_t型,没想到,编译通过了是不错,但不好用,我找了老半天程序。后来查到这个变量是bool型。
后来换成bool volatile callback_status = false;
程序就好用了。
程序运行的现象是我用一根导线直接接3.3V和COMP0第PA04脚则,灯亮了,我松开又灭了。
没产生比较时:
产生比较时:
以下是程序:
/**
* \file
*
* \brief Empty user application template
*
*/
/**
* \mainpage User Application template doxygen documentation
*
* \par Empty user application template
*
* This is a bare minimum user application template.
*
* For documentation of the board, go \ref group_common_boards "here" for a link
* to the board-specific documentation.
*
* \par Content
*
* -# Include the ASF header files (through asf.h)
* -# Minimal main function that starts with a call to system_init()
* -# Basic usage of on-board LED and button
* -# "Insert application code here" comment
*
*/
/*
* Include header files for all drivers that have been imported from
* Atmel Software Framework (ASF).
*/
#include <asf.h>
#include <stdio_serial.h>
bool volatile callback_status = false;
void configure_usart(void);
void configure_ac(void);
void configure_ac_channel(void);
void callback_function_ac(struct ac_module *const module_inst);
void configure_ac_callback(void);
struct usart_module usart_instance;
void configure_usart(void)
{
struct usart_config config_usart;
usart_get_config_defaults(&config_usart);
config_usart.baudrate = 9600;
config_usart.mux_setting = EXT3_UART_SERCOM_MUX_SETTING;
config_usart.pinmux_pad0 = EXT3_UART_SERCOM_PINMUX_PAD0;
config_usart.pinmux_pad1 = EXT3_UART_SERCOM_PINMUX_PAD1;
config_usart.pinmux_pad2 = EXT3_UART_SERCOM_PINMUX_PAD2;
config_usart.pinmux_pad3 = EXT3_UART_SERCOM_PINMUX_PAD3;
while (usart_init(&usart_instance, EXT3_UART_MODULE, &config_usart) != STATUS_OK)
{ }
stdio_serial_init(&usart_instance, EXT3_UART_MODULE, &config_usart);
usart_enable(&usart_instance);
}
/* AC module software instance (must not go out of scope while in use) */
static struct ac_module ac_instance;
/* Comparator channel that will be used */
#define AC_COMPARATOR_CHANNEL AC_CHAN_CHANNEL_0
void configure_ac(void)
{
/* Create a new configuration structure for the Analog Comparator settings * and fill with the default module settings. */
struct ac_config config_ac;
ac_get_config_defaults(&config_ac);
/* Alter any Analog Comparator configuration settings here if required */
/* Initialize and enable the Analog Comparator with the user settings */
ac_init(&ac_instance, AC, &config_ac);
}
void configure_ac_channel(void)
{
/* Create a new configuration structure for the Analog Comparator channel * settings and fill with the default module channel settings. */
struct ac_chan_config config_ac_chan;
ac_chan_get_config_defaults(&config_ac_chan);
/* Set the Analog Comparator channel configuration settings */
config_ac_chan.sample_mode = AC_CHAN_MODE_SINGLE_SHOT;
config_ac_chan.positive_input = AC_CHAN_POS_MUX_PIN0;
config_ac_chan.negative_input = AC_CHAN_NEG_MUX_SCALED_VCC;
config_ac_chan.vcc_scale_factor = 32;
config_ac_chan.interrupt_selection = AC_CHAN_INTERRUPT_SELECTION_END_OF_COMPARE;
/* Set up a pin as an AC channel input */
struct system_pinmux_config ac0_pin_conf;
system_pinmux_get_config_defaults(&ac0_pin_conf);
ac0_pin_conf.direction = SYSTEM_PINMUX_PIN_DIR_INPUT;
ac0_pin_conf.mux_position = MUX_PA04B_AC_AIN0;
system_pinmux_pin_set_config(PIN_PA04B_AC_AIN0, &ac0_pin_conf);
/* Initialize and enable the Analog Comparator channel with the user * settings */
ac_chan_set_config(&ac_instance, AC_COMPARATOR_CHANNEL, &config_ac_chan);
ac_chan_enable(&ac_instance, AC_COMPARATOR_CHANNEL);
}
void callback_function_ac(struct ac_module *const module_inst)
{
callback_status = true;
}
void configure_ac_callback(void)
{
ac_register_callback(&ac_instance, callback_function_ac, AC_CALLBACK_COMPARATOR_0);
ac_enable_callback(&ac_instance, AC_CALLBACK_COMPARATOR_0);
}
int main (void)
{
system_init();
configure_usart();
configure_ac();
configure_ac_channel();
configure_ac_callback();
ac_enable(&ac_instance);
uint8_t string[] = "Hello World!\r\n";
uint8_t mystring = 0x55;
int i=30122121;
long int i2 = 30122121;
usart_write_buffer_wait(&usart_instance, string, sizeof(string));
uint16_t temp;
//while (true)
//{
// usart_write_buffer_wait(&usart_instance, &mystring, sizeof( mystring));
// printf("\n");
// printf("How are youj!!!! \r\n");
// printf("%d,%ld\n",i,i2);
// printf("The size of uint8_t is %d \r\n",sizeof(uint8_t));
// printf("The size of uint8_t is %d \r\n",sizeof(uint16_t));
// printf("The size of uint8_t is %d \r\n",sizeof(uint32_t));
// printf("The size of uint8_t is %d \r\n",sizeof(uint64_t));
// printf("The size of uint8_t is %d \r\n",sizeof(int8_t));
// if (usart_read_wait(&usart_instance, &temp) == STATUS_OK)
// { while (usart_write_wait(&usart_instance, temp) != STATUS_OK)
// { }
// }
//}
system_interrupt_enable_global();
ac_chan_trigger_single_shot(&ac_instance, AC_COMPARATOR_CHANNEL);
uint8_t last_comparison = AC_CHAN_STATUS_UNKNOWN;
port_pin_set_output_level(LED_0_PIN, false);
while (true)
{
if (callback_status == true)
{
port_pin_set_output_level(LED_0_PIN, true);
do
{
last_comparison = ac_chan_get_status(&ac_instance,AC_COMPARATOR_CHANNEL);
} while (last_comparison & AC_CHAN_STATUS_UNKNOWN);
port_pin_set_output_level(LED_0_PIN, (last_comparison & AC_CHAN_STATUS_NEG_ABOVE_POS));
callback_status = false;
ac_chan_trigger_single_shot(&ac_instance, AC_COMPARATOR_CHANNEL);
}
}
}
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