/**********************************************************************************************************
* Description: This function is used to continue transfer data.
*
* Arguments : port is the uart port
*
* Returns :
**********************************************************************************************************/
static void tls_uart_tx_chars(struct tls_uart_port *port)
{
struct tls_uart_circ_buf *xmit = &port->xmit;
int tx_count = 64;
int len;
if (uart_circ_empty(xmit)) {
// tls_uart_tx_disable(port);
if(port->tx_sem)
tls_os_sem_release(port->tx_sem);
return;
}
while (!uart_circ_empty(xmit) && tx_count-- > 0) {
/* 检查tx fifo是否已满 */
if ((port->regs->UR_FIFOS & UFS_TX_FIFO_CNT_MASK) ==
port->tx_fifofull)
break;
port->regs->UR_TXW = xmit->buf[xmit->tail];
xmit->tail = (xmit->tail + 1) & (TLS_UART_TX_BUF_SIZE - 1);
port->icount.tx++;
}
len = uart_circ_chars_pending(xmit);
if (len < WAKEUP_CHARS) {
if(port->tx_callback)
port->tx_callback(port);
}
#if 0
if (uart_circ_empty(xmit))
tls_uart_tx_disable(port);
#endif
}
void _mutex_release (u32 *mutex) {
/* Release a system mutex, unlock stdlib resources. */
tls_os_sem_release(libc_sem);
}