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Added optional interrupt-based transmission, based on the ringbuf library
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@ -26,7 +26,7 @@
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)$Id: uart1.c,v 1.9 2009/02/24 21:31:10 adamdunkels Exp $
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* @(#)$Id: uart1.c,v 1.10 2009/03/01 20:40:30 adamdunkels Exp $
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*/
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/*
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@ -42,13 +42,27 @@
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#include "dev/leds.h"
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#include "dev/watchdog.h"
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#include "lib/ringbuf.h"
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static int (*uart1_input_handler)(unsigned char c);
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static uint8_t rx_in_progress;
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static volatile uint8_t transmitting;
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#define TX_WITH_INTERRUPT 1
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#if TX_WITH_INTERRUPT
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#define TXBUFSIZE 64
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static struct ringbuf txbuf;
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static uint8_t txbuf_data[TXBUFSIZE];
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#endif /* TX_WITH_INTERRUPT */
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/*---------------------------------------------------------------------------*/
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uint8_t
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uart1_active(void)
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{
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return ((~ UTCTL1) & TXEPT) | rx_in_progress;
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return ((~ UTCTL1) & TXEPT) | rx_in_progress | transmitting;
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}
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/*---------------------------------------------------------------------------*/
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void
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@ -60,12 +74,30 @@ uart1_set_input(int (*input)(unsigned char c))
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void
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uart1_writeb(unsigned char c)
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{
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#if TX_WITH_INTERRUPT
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/* Put the outgoing byte on the transmission buffer. If the buffer
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is full, we just keep on trying to put the byte into the buffer
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until it is possible to put it there. */
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while(ringbuf_put(&txbuf, c) == 0) {
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watchdog_periodic();
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}
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/* If there is no transmission going, we need to start it by putting
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the first byte into the UART. */
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if(transmitting == 0) {
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transmitting = 1;
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TXBUF1 = ringbuf_get(&txbuf);
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}
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#else /* TX_WITH_INTERRUPT */
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watchdog_periodic();
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/* Loop until the transmission buffer is available. */
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while((IFG2 & UTXIFG1) == 0);
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/* Transmit the data. */
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TXBUF1 = c;
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#endif /* TX_WITH_INTERRUPT */
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}
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/*---------------------------------------------------------------------------*/
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#if ! WITH_UIP /* If WITH_UIP is defined, putchar() is defined by the SLIP driver */
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@ -127,12 +159,17 @@ uart1_init(unsigned long ubr)
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rx_in_progress = 0;
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transmitting = 0;
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IE2 |= URXIE1; /* Enable USART1 RX interrupt */
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#if TX_WITH_INTERRUPT
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IE2 |= UTXIE1; /* Enable USART1 RX interrupt */
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ringbuf_init(&txbuf, txbuf_data, sizeof(txbuf_data));
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#endif /* TX_WITH_INTERRUPT */
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}
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/*---------------------------------------------------------------------------*/
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interrupt(UART1RX_VECTOR)
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uart1_interrupt(void)
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uart1_rx_interrupt(void)
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{
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ENERGEST_ON(ENERGEST_TYPE_IRQ);
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@ -159,3 +196,19 @@ uart1_interrupt(void)
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ENERGEST_OFF(ENERGEST_TYPE_IRQ);
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}
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/*---------------------------------------------------------------------------*/
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#if TX_WITH_INTERRUPT
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interrupt(UART1TX_VECTOR)
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uart1_tx_interrupt(void)
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{
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ENERGEST_ON(ENERGEST_TYPE_IRQ);
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if(ringbuf_elements(&txbuf) == 0) {
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transmitting = 0;
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} else {
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TXBUF1 = ringbuf_get(&txbuf);
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}
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ENERGEST_OFF(ENERGEST_TYPE_IRQ);
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}
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#endif /* TX_WITH_INTERRUPT */
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/*---------------------------------------------------------------------------*/
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