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cleared lock semantics

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This commit is contained in:
nvt-se 2008-05-28 13:17:08 +00:00
parent 7ca33e2285
commit 44c93fcd93
1 changed files with 13 additions and 20 deletions
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27
platform/msb430/dev/msb430-uart1.c
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@ -143,17 +143,19 @@ uart_set_handler(unsigned mode, fp_uart_handler fpHandler)
int
uart_lock(unsigned mode)
{
// already locked?
if (uart_mode != mode && uart_lockcnt > 0) {
return 0;
if (uart_mode == mode) {
uart_lockcnt++;
return 1;
}
// increase lock count
uart_lockcnt++;
// switch mode (if neccessary)
if (uart_lockcnt == 0) {
uart_set_mode(mode);
uart_lockcnt++;
return 1;
}
return 0;
}
/*---------------------------------------------------------------------------*/
int
uart_lock_wait(unsigned mode)
@ -167,23 +169,15 @@ uart_lock_wait(unsigned mode)
int
uart_unlock(unsigned mode)
{
if ((uart_lockcnt == 0) || (mode != uart_mode)) {
uart_lockcnt = 0;
uart_set_mode(UART_MODE_DEFAULT);
if (uart_lockcnt == 0 || mode != uart_mode) {
return 0;
}
// decrement lock
if (uart_lockcnt > 0) {
uart_lockcnt--;
// if no more locks, switch back to default mode
if (uart_lockcnt == 0) {
if (--uart_lockcnt == 0) {
uart_set_mode(UART_MODE_DEFAULT);
}
return 1;
}
return 0;
}
/*---------------------------------------------------------------------------*/
void
uart_set_mode(unsigned mode)
@ -196,7 +190,6 @@ uart_set_mode(unsigned mode)
IE2 &= ~(URXIE1 | UTXIE1); // disable irq
uart_configure(mode); // configure uart parameters
uart_mode = mode;
uart_lockcnt = 0;
if (uart_handler[mode] != NULL) {
IE2 |= URXIE1; // Enable USART1 RX interrupt