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lock wait function from Michael Baar.

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This commit is contained in:
nvt-se 2008-03-28 16:06:28 +00:00
parent bd8809d35d
commit 10cabda581
2 changed files with 25 additions and 11 deletions
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27
platform/msb430/dev/msb430-uart1.c
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@ -116,13 +116,14 @@ uart_set_speed(unsigned mode, unsigned ubr0,
unsigned ubr1, unsigned umctl)
{
// store setting
uart_speed_br0[mode] = ubr0; // baudrate
uart_speed_br1[mode] = ubr1; // baudrate
uart_speed_br0[mode] = ubr0; // baudrate
uart_speed_br1[mode] = ubr1; // baudrate
uart_speed_bmn[mode] = umctl; // modulation
// reconfigure, if mode active
if (uart_mode == mode)
if (uart_mode == mode) {
uart_configure(mode);
}
}
/*---------------------------------------------------------------------------*/
void
@ -143,7 +144,7 @@ int
uart_lock(unsigned mode)
{
// already locked?
if (uart_lockcnt > 0) {
if (uart_mode != mode && uart_lockcnt > 0) {
return 0;
}
@ -155,16 +156,26 @@ uart_lock(unsigned mode)
}
/*---------------------------------------------------------------------------*/
int
uart_lock_wait(unsigned mode)
{
while (UART_WAIT_LOCK(mode)) {
_NOP();
}
return uart_lock(mode);
}
/*---------------------------------------------------------------------------*/
int
uart_unlock(unsigned mode)
{
if ((uart_lockcnt == 0) || (mode != uart_mode)) {
uart_lockcnt = 0;
uart_set_mode(UART_MODE_DEFAULT);
return 0;
}
// decrement lock
if (uart_lockcnt > 0) {
uart_lockcnt--;
// if no more locks, switch back to default mode
if (uart_lockcnt == 0) {
uart_set_mode(UART_MODE_DEFAULT);
@ -178,15 +189,17 @@ void
uart_set_mode(unsigned mode)
{
// do nothing if mode already set
if (mode == uart_mode)
if (mode == uart_mode) {
return;
}
IE2 &= ~(URXIE1 | UTXIE1); // disable irq
uart_configure(mode); // configure uart parameters
uart_mode = mode;
if (uart_handler[mode] != NULL)
if (uart_handler[mode] != NULL) {
IE2 |= URXIE1; // Enable USART1 RX interrupt
}
}
/*---------------------------------------------------------------------------*/
int