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一.手工编写按钮事件
使用PIO11 PIO12来分别模拟ButtonA和ButtonB，则相应的按钮事件和处理程序为：
#include <pio.h>
#include <stdio.h>
#include <message.h>
#define BUTTON_A (1 << 11) /* PIO11 is BUTTON_A */
#define BUTTON_B (1 << 12) /* PIO12 is BUTTON_B */
typedef struct
{
TaskData task; /* task is required for messages to be delivered */
} appState;
appState app;
/* Function prototypes */
static void app_handler(Task task, MessageId id, Message message);
static void handle_pio(Task task, MessagePioChanged *pio);
int main(void)
{
/* Set app_handler() function to handle app‘s messages */
app.task.handler = app_handler;
/* Set app task to receive PIO messages */
MessagePioTask(&app.task);
/* Setup PIO interrupt messages */
PioDebounce32(BUTTON_A | BUTTON_B, /* PIO pins we are interested in */
2, 20); /* 2 reads and 20ms between them */
MessageLoop();
return 0;
}
static void app_handler(Task task, MessageId id, Message message)
{
switch (id)
{
case MESSAGE_PIO_CHANGED:
handle_pio(task, (MessagePioChanged*)message);
break;
default:
printf("Unhandled message 0x%x\n", id);
}
}
static void handle_pio(Task task, MessagePioChanged *pio)
{
if (pio->state & BUTTON_A) printf("Button A pressed\n");
if (pio->state & BUTTON_B) printf("Button B pressed\n");
}
将程序下载到板子上，按目标板上的“PLAY”和“VOL-”按钮，则会出现对应Button A Pressed和Button B Pressed。
二.自动生成按钮事件
使用CSR自带的buttonparsepro.exe程序将sample.button文件转换成对应的sample.c和sample.h文件，然后主程序引用这两个文件即可。
首先我们编写sample.button文件：
//
// Setup debouncing
//
// The format for PIO debouncing is
// "debounce" count period
// where
// "debounce" is text debounce as is
// count is the number of times to read from the pins
// period is the delay between reads
// Do two reads 20 ms between them
debounce 2 20
//
// Define PIO pins that are used
//
// The format for defining PIO pins is
// "pio" pin name
// where
// "pio" is text pio as is
// pin is pin number, for example 7 for PIO7
// name is pin name, for example BUTTON1
// Use name BUTTON_A for PIO11
pio 11 BUTTON_A
// Use name BUTTON_B for PIO12
pio 12 BUTTON_B
//
// Define messages for PIO events
//
// The format for defining PIO events is
// "message" name
// message_parameters*
// where
// "message" is text message as is
// name is name of the message, for example BUTTON_PRESSED
// message_parameters
// are parameters defining when message is send
// Send message A_PRESS when BUTTON_A is pressed
message A_PRESS
BUTTON_A enter
// Send message B_RELEASE when BUTTON_B is released
message B_RELEASE
BUTTON_B release
// Send message A_DOUBLE when BUTTON_A is double-pressed within half a sec
message A_DOUBLE
BUTTON_A double 500
该文件就是描述PIO11和PIO12分别对应BUTTON_A的A_PRESS事件/A_DOUBLE事件和BUTTON_B的B_RELEASE事件。
然后我们使用buttonparsepro.exe程序来解析该文件，命令为：
buttonparsepro sample.button sample
命令运行后，会提示成功与否，如果成功，则会生成sample.c和sample.h两个文件，将这两个文件拷贝到主程序中，并在主程序中将sample.h包含进去，即可使用对应的按钮事件消息。引用sample.h的程序为：
#include <pio.h>
#include <stdio.h>
#include <message.h>
#include "sample.h"
typedef struct
{
TaskData task; /* task is required for messages to be delivered */
PioState pio; /* PIO state used by buttonparse */
} appState;
appState app;
/* Function prototypes */
static void app_handler(Task task, MessageId id, Message message);
int main(void)
{
/* Set app_handler() function to handle app‘s messages */
app.task.handler = app_handler;
/* Set app task to receive button messages */
pioInit(&app.pio, &app.task);
MessageLoop();
return 0;
}
static void app_handler(Task task, MessageId id, Message message)
{
switch (id)
{
case A_PRESS:
printf("Button A pressed\n");
break;
case B_RELEASE:
printf("Button B released\n");
break;
case A_DOUBLE:
printf("Button A double-pressed\n");
break;
default:
printf("Unhandled message 0x%x\n", id);
}
}
/* End-of-File */
运行程序，按目标板上的“PLAY”和“VOL-”按钮，则会出现对应Button A Pressed和Button B Released事件。
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原文地址：http://www.cnblogs.com/fingertouch/p/4588173.html
