Hi,
Currently I implemented a UART application on CC2541. Basically the application echoes what it receives from the UART Rx to the Tx pin at 115200 baud rate. But it encounters data lost.
j
Shown above is one instance where "abcdefghijklmnopq" is sent from a PC to CC2541, and the yellow font characters are the reponse. You can notice a randomn lost of charaters.
The following is my implementation of the echo function.
switch (*event)
{
case IO_SHIM_UART_RX_FULL:
case IO_SHIM_UART_RX_ABOUT_FULL:
case IO_SHIM_UART_RX_TIMEOUT:
holder.size=32;
avail_len=Hal_UART_RxBufLen(HAL_UART_PORT_0);
res=io_shim_recv_data(IO_SHIM_UART,&holder);
HalUARTWrite(HAL_UART_PORT_0,holder.data,avail_len);
HalLcdWriteStringValue("LEN:",holder.size,10,2);
HalLcdWriteString(holder.data,3);
break;
case IO_SHIM_UART_TX_FULL:
break;
case IO_SHIM_UART_TX_EMPTY:
break;
default:
break;
}
After a careful examination, the event processing routine is called twice. The first call echoes "abcdefghijk", and the second call echoes "mnopq". It seemed that the receiving process is interrupted somehow. I checked the input data stream, there was no gaps between data bytes that was long enough to trigger an UART_IDLE_TIMEOUT. Therefore I wonder if there is anything that interrupts the UART receiving process?
Here is my configuration procedure
uart_config.configured=false;
uart_config.baudRate=HAL_UART_BR_115200;
uart_config.flowControl=false;
uart_config.flowControlThreshold=100;
uart_config.idleTimeout=2000;
uart_config.rx.pBuffer=uart_rxbuf;
uart_config.rx.maxBufSize=128;
uart_config.tx.pBuffer=uart_txbuf;
uart_config.tx.maxBufSize=128;
uart_config.intEnable=false;
uart_config.callBackFunc=uart_cb_fp;
Here is my constant definition.
INT_HEAP_LEN=3072
HALNODEBUG
OSAL_CBTIMER_NUM_TASKS=1
xHAL_AES_DMA=TRUE
HAL_DMA=TRUE
HAL_UART=TRUE
xHAL_UART_DMA=TRUE
xHAL_UART_DMA=0
HAL_UART_ISR=0
HAL_UART_ISR_RX_MAX=128
HAL_UART_ISR_HIGH=110
xHAL_UART_DMA_RX_MAX=128
xHAL_UART_DMA_HIGH=110
OSAL_CLOCK
xPOWER_SAVING
xPLUS_BROADCASTER
HAL_LCD=TRUE
HAL_LED=TRUE
CC2541_MINIDK
DC_DC_P0_7
Thanks in advance for your input.
