PUBLIC void init_uart(void)
{
//Inicializa pinos UART
uart_attach(21, 20);
//Configura funcionamento da UART1
uart_set_baudRate(_UART0, BAUD_9600);
uart_set_enable(_UART0, UART_ENABLE, UART_ENABLE_RX, UART_ENABLE_TX);
uart_set_conf(_UART0, UART_ASYNC, UART_HIGH_COM, UART_RX_8BITS, UART_TX_8BITS, UART_BD_16BITS);
//Configura interrupcao UART1
uart_setup_interrupt(_UART0, ENABLE, DISABLE);
uart_priority_interrupt(_UART0, HIGH_PRIORITY, LOW_PRIORITY);
uart_rx_set_callback(_UART0, uart_rx);
uart_tx_set_callback(_UART0, uart_tx);
}
static int uart_open(FAR struct file *filep)
{
struct inode *inode = filep->f_inode;
uart_dev_t *dev = inode->i_private;
uint8_t tmp;
int ret = OK;
/* If the port is the middle of closing, wait until the close is finished */
uart_takesem(&dev->closesem);
/* Start up serial port */
/* Increment the count of references to the device. */
tmp = dev->open_count + 1;
if (tmp == 0)
{
/* More than 255 opens; uint8_t overflows to zero */
ret = -EMFILE;
goto errout_with_sem;
}
/* Check if this is the first time that the driver has been opened. */
if (tmp == 1)
{
irqstate_t flags = irqsave();
/* If this is the console, then the UART has already been initialized. */
if (!dev->isconsole)
{
/* Perform one time hardware initialization */
ret = uart_setup(dev);
if (ret < 0)
{
irqrestore(flags);
goto errout_with_sem;
}
}
/* In any event, we do have to configure for interrupt driven mode of
* operation. Attach the hardware IRQ(s). Hmm.. should shutdown() the
* the device in the rare case that uart_attach() fails, tmp==1, and
* this is not the console.
*/
ret = uart_attach(dev);
if (ret < 0)
{
uart_shutdown(dev);
irqrestore(flags);
goto errout_with_sem;
}
/* Mark the io buffers empty */
dev->xmit.head = 0;
dev->xmit.tail = 0;
dev->recv.head = 0;
dev->recv.tail = 0;
/* Enable the RX interrupt */
uart_enablerxint(dev);
irqrestore(flags);
}
/* Save the new open count on success */
dev->open_count = tmp;
errout_with_sem:
uart_givesem(&dev->closesem);
return ret;
}
static int uart_open(FAR struct file *filep)
{
struct inode *inode = filep->f_inode;
uart_dev_t *dev = inode->i_private;
uint8_t tmp;
int ret;
/* If the port is the middle of closing, wait until the close is finished.
* If a signal is received while we are waiting, then return EINTR.
*/
ret = uart_takesem(&dev->closesem, true);
if (ret < 0)
{
/* A signal received while waiting for the last close operation. */
return ret;
}
#ifdef CONFIG_SERIAL_REMOVABLE
/* If the removable device is no longer connected, refuse to open the
* device. We check this after obtaining the close semaphore because
* we might have been waiting when the device was disconnected.
*/
if (dev->disconnected)
{
ret = -ENOTCONN;
goto errout_with_sem;
}
#endif
/* Start up serial port */
/* Increment the count of references to the device. */
tmp = dev->open_count + 1;
if (tmp == 0)
{
/* More than 255 opens; uint8_t overflows to zero */
ret = -EMFILE;
goto errout_with_sem;
}
/* Check if this is the first time that the driver has been opened. */
if (tmp == 1)
{
irqstate_t flags = irqsave();
/* If this is the console, then the UART has already been initialized. */
if (!dev->isconsole)
{
/* Perform one time hardware initialization */
ret = uart_setup(dev);
if (ret < 0)
{
irqrestore(flags);
goto errout_with_sem;
}
}
/* In any event, we do have to configure for interrupt driven mode of
* operation. Attach the hardware IRQ(s). Hmm.. should shutdown() the
* the device in the rare case that uart_attach() fails, tmp==1, and
* this is not the console.
*/
ret = uart_attach(dev);
if (ret < 0)
{
uart_shutdown(dev);
irqrestore(flags);
goto errout_with_sem;
}
/* Mark the io buffers empty */
dev->xmit.head = 0;
dev->xmit.tail = 0;
dev->recv.head = 0;
dev->recv.tail = 0;
/* Initialise termios state */
#ifdef CONFIG_SERIAL_TERMIOS
dev->tc_iflag = 0;
if (dev->isconsole == true)
{
/* Enable \n -> \r\n translation for the console */
dev->tc_oflag = OPOST | ONLCR;
}
else
{
dev->tc_oflag = 0;
}
#endif
/* Enable the RX interrupt */
uart_enablerxint(dev);
irqrestore(flags);
}
/* Save the new open count on success */
dev->open_count = tmp;
errout_with_sem:
uart_givesem(&dev->closesem);
return ret;
}
