参数资料
| 型号： | DM240415 |
| 厂商： | Microchip Technology |
| 文件页数： | 25/63页 |
| 文件大小： | 0K |
| 描述： | ACCESSORY DEVELOPMENT START KIT |
| 设计资源： | PIC24F ADK Schematic |
| 特色产品： | DM240415 Android? Accessory Starter Kit |
| 标准包装： | 1 |
| 主要目的： | 参考设计，平板式 |
| 嵌入式： | 是，MCU，16 位 |
| 已用 IC / 零件： | PIC24F |
| 主要属性： | 机器人 OS，附件开发平台，兼容 Arduino |
| 次要属性： | 免版税，免软件库许可费 |
| 已供物品： | 电路板，适配器，调试程序，电源，软件 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页当前第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页
Microchip's Accessory Framework for Android(tm)
20
if (AndroidAppIsWriteComplete(device_handle, &errorCode, &size) == TRUE)
{
writeInProgress = FALSE;
if (errorCode != USB_SUCCESS)
{
//Error
DEBUG_ERROR("Error trying to complete write");
}
}
}
if ((buttonsNeedUpdate == TRUE) && (writeInProgress == FALSE))
{
response_packet.command = COMMAND_UPDATE_PUSHBUTTONS;
response_packet.data = pushButtonValues;
errorCode = AndroidAppWrite(device_handle,(BYTE*)&response_packet, 2);
if ( errorCode != USB_SUCCESS )
{
DEBUG_ERROR("Error trying to send button update");
}
else
{
buttonsNeedUpdate = FALSE;
writeInProgress = TRUE;
}
}
}
4.2.6 Receiving Data
Receiving data from the Android device is very similar to sending data. There are two functions that are used:
The AndroidAppRead (
situation where the Android device is the USB peripheral, this will initiate an IN request on the bus. If the Android device
doesn't have any information it will respond with NAKs. One key thing to know about the read function is that the buffer
passed to the read function must always be able to receive at least one packets worth of USB data. For full-speed USB
devices this is 64 bytes.
The read request will terminate if a couple of conditions occur. The first is if the total number of bytes requested has been
read. The second is if a packet with less than the maximum packet length is received. This typically indicates that fewer
bytes than requested are available and that no more packets are immediately pending. While this is true for most cases, it
may not be true for every case. If the target application is one of those exceptions, keep in mind that you may have to call
the read function multiple times in order to receive a complete transmission from the applications perspective. Remember
keep the stack running. This means that you shouldn't loop on the AndroidAppIsReadComplete (
function. Instead use either a state machine or booleans to indicate what you need to do.
while (1)
4
{
//Keep the stack running
USBTasks();
//Do some extra stuff here
if (readInProgress == FALSE)
{
errorCode = AndroidAppRead(device_handle,
(BYTE*)&command_packet,
(DWORD) sizeof (ACCESSORY_APP_PACKET));
//If the device is attached, then lets wait for a command from the application
20
相关PDF资料 |
PDF描述 |
|---|---|
| DM300004-2 | BOARD DEMO DSPICDEM.NET 2 |
| DM300014 | BOARD DEMO DSPICDEM 1.1 GEN PURP |
| DM300016 | BOARD DEMO DSPICDEM STARTER |
| DM300017 | BOARD DEMO DSPICDEM STARTER |
| DM300020 | BOARD DEV DSPICDEM MC1 MOTORCTRL |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DM2410-0AL1 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Optoelectronic |
| DM2410-0BL1 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Optoelectronic |
| DM2410-0CL1 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Optoelectronic |
| DM2410-0DL1 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Optoelectronic |
| DM2410-0GL1 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Optoelectronic |
发布紧急采购，3分钟左右您将得到回复。