STM32F4串口DMA发送数据会出现连包错包的现象

hong9424

这里是主函数发送数据

这是定时器向缓存区填数据

这是串口2接受数据

hong9424

一个串口100ms接收一次数据往缓存区里填，定时器是10ms往缓存区填一次数据，接收到数据之后会出现连包的现象像楼下图片显示那样

hong9424

$GNRMC,140047.70,A,3150.71403,N,11713.49340,E,0.113,,191218,,,A*67//这里是正确的包
$GNGGA,140047.70,3150.71403,N,11713.49340,E,1,04,12.83,97.3,M,-2.4,M,,*50
$RC2,140047.69,9770,,,,0,0,0,0,0,0,0,0,0,0*21
$RC2,140047.70,9771,,,,0,0,0,0,0,0,0,0,0,0*28
$RC2,140047.71,9772,,,,0,0,0,0,0,0,0,0,0,0*2A
$RC2,140047.72,9773,,,,0,0,0,0,0,0,0,0,0,0*28
$RC2,140047.73,9774,,,,0,0,0,0,0,0,0,0,0,0*2E
$RC2,140047.74,9775,,,,0,0,0,0,0,0,0,0,0,0*28
$RC2,140047.75,9776,,,,0,0,0,0,0,0,0,0,0,0*2A
$RC2,140047.76,9777,,,,0,0,0,0,0,0,0,0,0,0*28
$RC2,140047.77,9778,,,,0,0,0,0,0,0,0,0,0,0*26
$RC2,140047.78,9779,,,,0,0,0,0,0,0,0,0,0,0*2E,0$GNRMC,140047.80,A,3150.71420,N,11713.49344,E,0.130,,191218,,,A*6C//这是错误的包
$GNGGA,140047.80,3150.71420,N,11713.49344,E,1,04,12.83,97.2,M,-2.4,M,,*5B