【搬运】关于蓝牙手柄与M5StickC的连接
项目地址：https://github.com/bitbank2/esp32_gamepad/blob/master/examples/rfcomm_test/ 截至目前有许多兼容M5StickC的底座产品出现，如果想充分利用它们意味着你需要多一台M5StickC配合摇杆来作为遥控器进行控制。当然为了简化使用难度，官方都做了UIFlow的相关适配，可以快速的进行程序编写。如果你本来有一个蓝牙手柄又不想再额外购入一台设备，那么接下来的示例也许可以好好参考一下，常见的蓝牙模式分为经典SPP蓝牙和BLE蓝牙，作者使用SPP蓝牙进行通讯减少了UUID和服务特征的注册，减少了繁琐的注册流程，降低代码的复杂程度。注：以下代码中包含<bb_spi_lcd.h>来控制屏幕，支持M5StickC和T-DISPLAY，该库可通过Arduino管理器安装。此外作者在setup阶段用了不常用的goto的语法来判断条件扫描设备，虽然在很多读物中并不提倡此做法，但是有时候仍是一个解决问题的好办法。esp32_gamepad.h可以在上述地址中下载#include <esp32_gamepad.h>
#include <bb_spi_lcd.h>
#ifdef ARDUINO_M5Stick_C
#include <M5StickC.h>
#endif
// Uncomment this line if compiling for the TTGO T-Display
//#define TTGO_T_DISPLAY
#ifdef TTGO_T_DISPLAY
int GetButtons(void)
{
static int iOldState;
int iState, iPressed;
iState = 0;
if (digitalRead(0) == LOW)
iState |= 1;
if (digitalRead(35) == LOW)
iState |= 2;
// Test button bits for which ones changed from LOW to HIGH
iPressed = (iState ^ iOldState) & iState; // tells us which ones just changed to 1
iOldState = iState;
iPressed = iPressed | (iState << 8); // prepare combined state
return iPressed;
} /* GetButtons() */
#endif
#ifdef ARDUINO_M5Stick_C
int GetButtons(void)
{
static int iOldState;
int iState, iPressed;
iState = 0;
if (digitalRead(39) == LOW)
iState |= 1;
if (digitalRead(37) == LOW)
iState |= 2;
// Test button bits for which ones changed from LOW to HIGH
iPressed = (iState ^ iOldState) & iState; // tells us which ones just changed to 1
iOldState = iState;
iPressed = iPressed | (iState << 8); // prepare combined state
return iPressed;
} /* GetButtons() */
#endif
// Mike Rankin's Color Coincell V2
#if !defined ( ARDUINO_M5Stick_C ) && !defined( TTGO_T_DISPLAY )
// Touch Pad1 = GPIO27, T7
// Touch Pad2 = GPIO12, T5
// Touch Pad3 = GPIO15, T3
// Touch Pad4 = GPIO2 , T2
#define BUTTON_THRESHOLD 98
uint8_t iButtons = {T7,T5,T3,T2};
int GetButtons(void)
{
static int iOldState;
int iState, iPressed;
int i, j;
int iCounts = {0};
iState = 0;
// remove the 'flicker' of the buttons
for (j=0; j<5; j++)
{
for (i=0; i<4; i++)
{
if (touchRead(iButtons) < BUTTON_THRESHOLD)
iCounts++;
}
delay(4);
}
for (i=0; i<4; i++)
if (iCounts == 5)
iState |= (1<<i);
// Test button bits for which ones changed from LOW to HIGH
iPressed = (iState ^ iOldState) & iState; // tells us which ones just changed to 1
iOldState = iState;
iPressed = iPressed | (iState << 8); // prepare combined state
return iPressed;
} /* GetButtons() */
#endif // !TTGO_T_DISPLAY && !M5StickC
SS_GAMEPAD gp;
uint8_t address;
volatile bool bChanged;
void SS_Callback(int iEvent, SS_GAMEPAD *pGamepad)
{
bChanged = 1;
memcpy(&gp, pGamepad, sizeof(SS_GAMEPAD));
} /* SS_Callback() */
void setup() {
int i;
uint8_t devAddr;
int bDone = 0;
#ifdef TTGO_T_DISPLAY
spilcdInit(LCD_ST7789_135, 0, 0, 0, 32000000, 5, 16, -1, 4, -1, 19, 18); // TTGO T-Display pin numbering, 40Mhz
pinMode(0, INPUT_PULLUP);
pinMode(35, INPUT_PULLUP);
#endif
#ifdef ARDUINO_M5Stick_C
M5.begin();
M5.Axp.ScreenBreath(11); // turn on backlight
spilcdInit(LCD_ST7735S, 0, 1, 0, 40000000, 5, 23, 18, -1, 19, 15, 13); // M5StickC pin numbering
#endif
// Mike Rankin's Color coincell board v2
#if !defined(ARDUINO_M5Stick_C) && !defined(TTGO_T_DISPLAY)
spilcdInit(LCD_ST7735S_B, 1, 1, 0, 32000000, 4, 21, 22, 26, -1, 23, 18); // Mike Rankin's color coin cell pin numbering
#endif
spilcdSetOrientation(LCD_ORIENTATION_ROTATED);
SS_Init();
SS_RegisterCallback(SS_Callback);
try_again:
spilcdFill(0,1);
spilcdWriteString(0,0,(char *)"Starting discovery...", 0xffff, 0, FONT_NORMAL, 1);
if (SS_Scan(6, devAddr))
{
spilcdWriteString(0,16,(char *)"SS found!", 0x6e0, 0, FONT_STRETCHED, 1);
if (SS_Connect(devAddr))
{
spilcdWriteString(0,32,(char *)"Connected!", 0x6e0, 0, FONT_STRETCHED, 1);
bDone = 1;
delay(1000);
}
else
spilcdWriteString(0,32,(char *)"Not Connected", 0xf800, 0, FONT_STRETCHED, 1);
}
else
{
spilcdWriteString(0,16,(char *)"Not found", 0xf800, 0, FONT_STRETCHED, 1);
}
if (!bDone)
{
spilcdWriteString(0,64,(char *)"press any key to continue", 0x7ff, 0, FONT_SMALL, 1);
while (GetButtons() == 0)
{
}
goto try_again;
}
} // setup()
void loop() {
char szTemp;
spilcdFill(0,1);
while(1)
{
sprintf(szTemp,"B 0x%04x", gp.u16Buttons);
spilcdWriteString(0,0,szTemp, 0xffff,0,FONT_STRETCHED, 1);
sprintf(szTemp,"L%04d,%04d", gp.iLJoyX,gp.iLJoyY);
spilcdWriteString(0,24,szTemp, 0xf81f,0,FONT_STRETCHED, 1);
sprintf(szTemp,"R%04d,%04d", gp.iRJoyX,gp.iRJoyY);
spilcdWriteString(0,48,szTemp, 0x6e0,0,FONT_STRETCHED, 1);
}
} /* loop() */
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