Arvinds,
I checked the thread: UART Routines and the code you posted there.
I did 2 testes. In both tests I send 10 bytes to PUART when button is pressed (on TAG3 board):
#define W_MARK 0
void hello_sensor_interrupt_handler(UINT8 value)
{
if (value&0x01)
{
// Set watermark
// Max watermark level is P_UART_WATER_MARK_TX_LEVEL_HIGHEST ( = 15)
P_UART_WATER_MARK_TX_LEVEL( W_MARK );
if(P_UART_TX_FIFO_IS_EMPTY())
{
puart_synchronousWrite("12345678\n\r", 10) ;
// Enable the TX interrupt. Callback registered with puart_txCb will be invoked when all bytes
// have been transmitted.
P_UART_INT_ENABLE |= P_UART_ISR_TX_FAE_MASK;
}
}
}
In puart_tx_callback function I check if TX FIFO is empty:
void puart_tx_callback(void)
{
// Clear interrupt state
P_UART_INT_CLEAR(P_UART_ISR_TX_FAE_MASK);
// TX FIFO is empty now. So send another at most 16 bytes here if required,
// set new watermark (if not 0) and re-enable TX interrupt.
// check is TX FIFO is really empty
if(P_UART_TX_FIFO_IS_EMPTY())
ble_trace0(">>>>>> TX FIFO empty\n\r");
else
ble_trace0(">>>>>> TX FIFO not empty !!!\n\r");
}
Test 1.
#define W_MARK 0
puart_tx_callback reports that TX FIFO is NOT empty !!! why ????
Test 2.
#define W_MARK 15
Since we send only 10 bytes puart_tx_callback should never be called (10 < 15)
In fact puart_tx_callback IS called !!! why ????
Attached, you will find the test code based on hello_sensor app.
