Hi,
I'm trying to understand how a packet is sent over UART and at the lowest
layer (HplMsp430Usart1P under $TOSDIR/chips/msp430/usart) I can track, the
following is found:
MSP430REG_NORACE(U1TXBUF);
...
async command void Usart.tx(uint8_t data) {
atomic U1TXBUF = data;
}
Can anybody explain why this physically transmits the data to UART?
Also I'm tracking the source of sendDone event to see where it is originally
signalled, and in the same component I notice:
TOSH_SIGNAL(UART1TX_VECTOR) {
signal Interrupts.txDone();
}
What is TOSH_SIGNAL() and why a byte is regarded as sent when
TOSH_SIGNAL()is called back?
Thanks in advance.
--
-Xiaohui Liu
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