/*
* ISR for DMA mode Tx
*/
void rt_hw_serial_dma_tx_isr(struct rt_serial_device *serial)
{
const void *data_ptr;
rt_size_t data_size;
if (RT_EOK == rt_data_queue_pop(&(serial->tx_dq), &data_ptr, &data_size, 0))
{
/* transmit next data node */
serial->ops->dma_transmit(serial, data_ptr, data_size);
}
else
{
serial->dma_flag = RT_FALSE;
}
/* invoke callback */
if (serial->parent.tx_complete != RT_NULL)
{
serial->parent.tx_complete(&serial->parent, RT_NULL);
}
}
/* ISR for serial interrupt */
void rt_hw_serial_isr(struct rt_serial_device *serial, int event)
{
switch (event & 0xff)
{
case RT_SERIAL_EVENT_RX_IND:
{
int ch = -1;
rt_base_t level;
struct rt_serial_rx_fifo* rx_fifo;
/* interrupt mode receive */
rx_fifo = (struct rt_serial_rx_fifo*)serial->serial_rx;
RT_ASSERT(rx_fifo != RT_NULL);
while (1)
{
ch = serial->ops->getc(serial);
if (ch == -1) break;
/* disable interrupt */
level = rt_hw_interrupt_disable();
rx_fifo->buffer[rx_fifo->put_index] = ch;
rx_fifo->put_index += 1;
if (rx_fifo->put_index >= serial->config.bufsz) rx_fifo->put_index = 0;
/* if the next position is read index, discard this 'read char' */
if (rx_fifo->put_index == rx_fifo->get_index)
{
rx_fifo->get_index += 1;
if (rx_fifo->get_index >= serial->config.bufsz) rx_fifo->get_index = 0;
}
/* enable interrupt */
rt_hw_interrupt_enable(level);
}
/* invoke callback */
if (serial->parent.rx_indicate != RT_NULL)
{
rt_size_t rx_length;
/* get rx length */
level = rt_hw_interrupt_disable();
rx_length = (rx_fifo->put_index >= rx_fifo->get_index)? (rx_fifo->put_index - rx_fifo->get_index):
(serial->config.bufsz - (rx_fifo->get_index - rx_fifo->put_index));
rt_hw_interrupt_enable(level);
serial->parent.rx_indicate(&serial->parent, rx_length);
}
break;
}
case RT_SERIAL_EVENT_TX_DONE:
{
struct rt_serial_tx_fifo* tx_fifo;
tx_fifo = (struct rt_serial_tx_fifo*)serial->serial_tx;
rt_completion_done(&(tx_fifo->completion));
break;
}
case RT_SERIAL_EVENT_TX_DMADONE:
{
const void *data_ptr;
rt_size_t data_size;
const void *last_data_ptr;
struct rt_serial_tx_dma* tx_dma;
tx_dma = (struct rt_serial_tx_dma*) serial->serial_tx;
rt_data_queue_pop(&(tx_dma->data_queue), &last_data_ptr, &data_size, 0);
if (rt_data_queue_peak(&(tx_dma->data_queue), &data_ptr, &data_size) == RT_EOK)
{
/* transmit next data node */
tx_dma->activated = RT_TRUE;
serial->ops->dma_transmit(serial, data_ptr, data_size, RT_SERIAL_DMA_TX);
}
else
{
tx_dma->activated = RT_FALSE;
}
/* invoke callback */
if (serial->parent.tx_complete != RT_NULL)
{
serial->parent.tx_complete(&serial->parent, (void*)last_data_ptr);
}
break;
}
case RT_SERIAL_EVENT_RX_DMADONE:
{
int length;
struct rt_serial_rx_dma* rx_dma;
rx_dma = (struct rt_serial_rx_dma*)serial->serial_rx;
/* get DMA rx length */
length = (event & (~0xff)) >> 8;
serial->parent.rx_indicate(&(serial->parent), length);
rx_dma->activated = RT_FALSE;
break;
}
}
}
static rt_size_t rt_serial_write(struct rt_device *dev,
rt_off_t pos,
const void *buffer,
rt_size_t size)
{
rt_uint8_t *ptr;
rt_size_t write_nbytes = 0;
struct rt_serial_device *serial;
RT_ASSERT(dev != RT_NULL);
serial = (struct rt_serial_device *)dev;
ptr = (rt_uint8_t*)buffer;
if (dev->flag & RT_DEVICE_FLAG_INT_TX)
{
/* warning: data will be discarded if buffer is full */
while (size)
{
if (serial_ringbuffer_putchar(serial->int_tx, *ptr) != -1)
{
ptr ++;
size --;
}
else
break;
}
}
else if (dev->flag & RT_DEVICE_FLAG_DMA_TX)
{
const void *data_ptr = RT_NULL;
rt_size_t data_size = 0;
rt_base_t level;
rt_err_t result;
RT_ASSERT(0 == (dev->flag & RT_DEVICE_FLAG_STREAM));
result = rt_data_queue_push(&(serial->tx_dq), buffer, size, 20);
if (result == RT_EOK)
{
level = rt_hw_interrupt_disable();
if (serial->dma_flag == RT_FALSE)
{
serial->dma_flag = RT_TRUE;
rt_hw_interrupt_enable(level);
if (RT_EOK == rt_data_queue_pop(&(serial->tx_dq), &data_ptr, &data_size, 0))
{
serial->ops->dma_transmit(serial, data_ptr, data_size);
}
}
else
rt_hw_interrupt_enable(level);
return size;
}
else
{
rt_set_errno(result);
return 0;
}
}
else
{
/* polling mode */
while (size)
{
/*
* to be polite with serial console add a line feed
* to the carriage return character
*/
if (*ptr == '\n' && (dev->flag & RT_DEVICE_FLAG_STREAM))
{
serial->ops->putc(serial, '\r');
}
serial->ops->putc(serial, *ptr);
++ ptr;
-- size;
}
}
write_nbytes = (rt_uint32_t)ptr - (rt_uint32_t)buffer;
if (write_nbytes == 0)
{
rt_set_errno(-RT_EFULL);
}
return write_nbytes;
}
