AVR 328pb触摸功能基本介绍和使用
📝ATMEGA328PB-AU外设中带外围触摸控制器(PTC)电容式触摸按钮、滑块和轮子24个自帽通道和144个互帽通道。(ATMEGA328P没有的)
✅PTC-外围触摸控制器
- 🍃低功耗、高灵敏度、环保坚固的电容式触摸按钮、滑块和轮子
- 🍃支持从省电睡眠模式唤醒触摸
- 🍃支持互电容和自电容传感
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- 🌾互电容模式下的144个按钮
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- 🌾自电容模式下的24个按钮
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- 🌾混合匹配互电容和自电容传感器每个电极一个引脚
- 🌿无外部元件负载补偿电荷传感
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- 🍂寄生电容补偿和增益可调,灵敏度高
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- 🍂传感器的自动校准和重新校准
- 🌿单次电荷测量
- 🌿硬件噪声滤波和噪声信号去同步,实现高传导抗扰度.
- 🌿可选通道更改延迟允许根据需要选择新通道上的建立时间采集
- 🌿通过acquisition-complete中断降低CPU利用率.
PTC方框图
- 🌿PTC框图互电容(PTC Block Diagram Mutual-Capacitance)
- 🌿PTC框图自电容.(PTC Block Diagram Self-Capacitance)
- 🌿互电容传感器布置
- 🌿自电容传感器布置
📘PTC软件配置
📑为了访问PTC,用户必须使用Atmel Start QTouch®配置器来配置QTouch Library固件并将其与应用软件链接QTouch Library可用于在单个界面上以多种组合方式实现按钮、滑块和滚轮.
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🍁Atmel Studio 7.0触摸功能外设配置界面:
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🔱触摸参数:
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🔑通过Atmel Start QTouch配置的代码如下:
c
#include <atmel_start.h>
#include "touch.h"
extern volatile uint8_t measurement_done_touch;
int main(void)
{
uint8_t key_status0 = 0;
uint8_t key_status1 = 0;
/* Initializes MCU, drivers and middleware */
atmel_start_init();
/* Enable interrupts */
cpu_irq_enable();
/** If any of the two self-capacitance buttons is touched, the LED is turned ON
* When touch is released, the LED is turned OFF
*/
while (1) {
/* Does acquisition and post-processing */
touch_process();
if (measurement_done_touch == 1) {
measurement_done_touch = 0;
key_status0 = get_sensor_state(0) & 0x80;
key_status1 = get_sensor_state(1) & 0x80;
if ((0u != key_status0) || (0u != key_status1))
LED_set_level(true);
else
LED_set_level(false);
}
}
}
⛳注意事项
✨在具体使用触摸功能进行测试过程中发现,如果启用了串口打印调试信息,会发现触摸相应后,如果打印调试信息会出现乱码,目前解决的办法就是,在需要通过串口打印调试信息的时候,开启串口,在不需要打印串口调试信息的时候,关闭串口功能。
- 🔨解决串口输出乱码代码如下:
c
#include <atmel_start.h>
#include "touch.h"
#include <stdio.h>
extern volatile uint8_t measurement_done_touch;
int main(void)
{
uint8_t key_status0 = 0;
uint8_t key_status1 = 0;
uint8_t key_status2 = 0;
uint8_t key_status3 = 0;
/* Initializes MCU, drivers and middleware */
atmel_start_init();
/* Enable interrupts */
cpu_irq_enable();
//USART_disable();
/** If any of the two self-capacitance buttons is touched, the LED is turned ON
* When touch is released, the LED is turned OFF
*/
while (1) {
/* Does acquisition and post-processing */
touch_process();
if (measurement_done_touch == 1) {
measurement_done_touch = 0;
key_status0 = get_sensor_state(0) & 0x80;
key_status1 = get_sensor_state(1) & 0x80;
key_status2 = get_sensor_state(2) & 0x80;
key_status3 = get_sensor_state(3) & 0x80;
if ((0u != key_status0) || (0u != key_status1) || (0u != key_status2) || (0u != key_status3)){
LED_set_level(true);
USART_enable_tx();
printf("********\r\n");
printf("PE2:%d,PE3:%d,PE0:%d,PE1:%d\r\n",key_status0,key_status1,key_status2,key_status3);
printf("Touch Press PE0 - PE3\r\n");
USART_disable();
}
else
{
LED_set_level(false);
USART_disable();
}
}
}
}