AC比较器固名思议,就是模拟比较器就是模拟信号来进行比较,根据比较的结果进行动作.本程序里是选VCC/2为参考,用比较器第零脚的值同其比较,比较的结果在LED_0上输出.
至于怎么建立ASF工程请参考前面的贴子.
下面只讨论AC模拟比较器.首先打开上个工程的工程文件,然后打开ASF Wizard 把AC模块添入.然后再打开ASF EXPLOER.打开快速指导.
如下图所示:
然后按照提示建立自己的程序:然后编译,以下是编译通过的截图:
然后根据数据手册找到,PIN0的管脚为PA04
然后用万用表拉高PA04,则LED_0亮了,说明程序通过
以下是程序清单:
/**
* \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>
void configure_usart(void);
void configure_ac(void);
void configure_ac_channel(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 ac_chan_conf;
ac_chan_get_config_defaults(&ac_chan_conf);
/* Set the Analog Comparator channel configuration settings */
ac_chan_conf.sample_mode = AC_CHAN_MODE_SINGLE_SHOT;
ac_chan_conf.positive_input = AC_CHAN_POS_MUX_PIN0;
ac_chan_conf.negative_input = AC_CHAN_NEG_MUX_SCALED_VCC;
ac_chan_conf.vcc_scale_factor = 32;
/* 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, &ac_chan_conf);
ac_chan_enable(&ac_instance, AC_COMPARATOR_CHANNEL);}
int main (void)
{
system_init();
configure_usart();
configure_ac();
configure_ac_channel();
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)
// { }
// }
//}
ac_chan_trigger_single_shot(&ac_instance, AC_COMPARATOR_CHANNEL);
uint8_t last_comparison = AC_CHAN_STATUS_UNKNOWN;
while (true) {
if (ac_chan_is_ready(&ac_instance, AC_COMPARATOR_CHANNEL))
{
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));
ac_chan_trigger_single_shot(&ac_instance, AC_COMPARATOR_CHANNEL); } }
}
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