CC2640R2F从app向串口传输字节（数目不等于特征值时）出现乱码。怎么解决？

user6300988

Other Parts Discussed in Thread: CC2640R2F

板子CC2640R2F, SDK4.30, BLE5 , simple_peripheral工程，特征值20，app通过uuid4（修改具有写入功能）向蓝牙发送数据1-19字节，尾部会出现固定字节和随机零还有随机字节组合。比如输入16进制61，串口收到的是61+34（一个字节时固定时34）+00+20+18+。。。。（后面部份随机）。我在将其输入的字节strlen（）输出到串口看其长度变化，当输入字节数目为1，3，4，6，8，12，16字节时检测的字节长度不符合。

输入20字节时候是准确的，请问我可以输入小于20字节串口显示不乱码吗？

5 年多前

0 Kevin Qiu 5 年多前

TI__Guru* 82220 points

串口乱码的数据截图传上来看看
参考e2echina.ti.com/.../85543

0 user6300988 5 年多前回复 Kevin Qiu

Prodigy 80 points

0 user6300988 5 年多前回复 Kevin Qiu

Prodigy 80 points

不好意思回复晚了，图片已发，如上分别发61，6162，616263，.......。我看了一下你的链接我放一下我的配置
static bStatus_t simpleProfile_WriteAttrCB(uint16_t connHandle,
gattAttribute_t *pAttr,
uint8_t *pValue, uint16_t len,
uint16_t offset, uint8_t method)
{
bStatus_t status = SUCCESS;
uint8 notifyApp = 0xFF;

if ( pAttr->type.len == ATT_BT_UUID_SIZE )
{
// 16-bit UUID
uint16 uuid = BUILD_UINT16( pAttr->type.uuid[0], pAttr->type.uuid[1]);
switch ( uuid )
{
case SIMPLEPROFILE_CHAR1_UUID:
case SIMPLEPROFILE_CHAR3_UUID:
case SIMPLEPROFILE_CHAR4_UUID:

//Validate the value
// Make sure it's not a blob oper
if ( offset == 0 )
{
if ( len > 20 )
{
status = ATT_ERR_INVALID_VALUE_SIZE;
}
}
else
{
status = ATT_ERR_ATTR_NOT_LONG;
}

//Write the value
//Write the value

if ( status == SUCCESS )
{

uint8 *pCurValue = (uint8 *)pAttr->pValue;

memcpy(pCurValue,pValue,20);
notifyApp = SIMPLEPROFILE_CHAR4;

}

break;

case GATT_CLIENT_CHAR_CFG_UUID:
status = GATTServApp_ProcessCCCWriteReq( connHandle, pAttr, pValue, len,
offset, GATT_CLIENT_CFG_NOTIFY );
break;

default:
// Should never get here! (characteristics 2 and 4 do not have write permissions)
status = ATT_ERR_ATTR_NOT_FOUND;
break;
}
}
else
{
// 128-bit UUID
status = ATT_ERR_INVALID_HANDLE;
}

// If a characteristic value changed then callback function to notify application of change
if ( (notifyApp != 0xFF ) && simpleProfile_AppCBs && simpleProfile_AppCBs->pfnSimpleProfileChange )
{
simpleProfile_AppCBs->pfnSimpleProfileChange( notifyApp );
}

return ( status );
}

特征值部分代码
// Characteristic 4 configuration
{
{ ATT_BT_UUID_SIZE, clientCharCfgUUID },
GATT_PERMIT_READ | GATT_PERMIT_WRITE,
0,
(uint8 *)&simpleProfileChar4Config
},

// Characteristic 4 User Description
{
{ ATT_BT_UUID_SIZE, charUserDescUUID },
GATT_PERMIT_READ,
0,
simpleProfileChar4UserDesp
},