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[DeviceDriver] Make uart rx DMA FIFO to use the FIFO full flag.

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This commit is contained in:
armink 2017-05-24 08:59:33 +08:00
parent 14728ff4ae
commit 99911a4c6f
1 changed files with 29 additions and 14 deletions
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43
components/drivers/serial/serial.c
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@ -168,14 +168,21 @@ rt_inline int _serial_int_tx(struct rt_serial_device *serial, const rt_uint8_t *
*/
static rt_size_t rt_dma_calc_recved_len(struct rt_serial_device *serial)
{
rt_size_t rx_length;
struct rt_serial_rx_fifo *rx_fifo = (struct rt_serial_rx_fifo *) serial->serial_rx;
RT_ASSERT(rx_fifo != RT_NULL);
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));
return rx_length;
if (rx_fifo->put_index > rx_fifo->get_index)
return rx_fifo->put_index - rx_fifo->get_index;
else if (rx_fifo->put_index < rx_fifo->get_index)
return serial->config.bufsz - (rx_fifo->get_index - rx_fifo->put_index);
else
{
if (rx_fifo->is_full)
return serial->config.bufsz;
else
return 0;
}
}
/**
@ -191,10 +198,12 @@ static void rt_dma_recv_update_get_index(struct rt_serial_device *serial, rt_siz
RT_ASSERT(rx_fifo != RT_NULL);
RT_ASSERT(len <= rt_dma_calc_recved_len(serial));
if (rx_fifo->is_full && len != 0) rx_fifo->is_full = RT_FALSE;
rx_fifo->get_index += len;
if (rx_fifo->get_index > serial->config.bufsz)
{
rx_fifo->get_index -= serial->config.bufsz;
rx_fifo->get_index %= serial->config.bufsz;
}
}
@ -220,7 +229,8 @@ static void rt_dma_recv_update_put_index(struct rt_serial_device *serial, rt_siz
/* force overwrite get index */
if (rx_fifo->put_index >= rx_fifo->get_index)
{
rx_fifo->get_index = rx_fifo->put_index + 1;
rx_fifo->get_index = rx_fifo->put_index;
rx_fifo->is_full = RT_TRUE;
}
}
}
@ -235,7 +245,8 @@ static void rt_dma_recv_update_put_index(struct rt_serial_device *serial, rt_siz
rx_fifo->put_index %= serial->config.bufsz;
}
/* force overwrite get index */
rx_fifo->get_index = rx_fifo->put_index + 1;
rx_fifo->get_index = rx_fifo->put_index;
rx_fifo->is_full = RT_TRUE;
}
}
if (rx_fifo->get_index >= serial->config.bufsz) rx_fifo->get_index = 0;
@ -252,7 +263,8 @@ rt_inline int _serial_dma_rx(struct rt_serial_device *serial, rt_uint8_t *data,
level = rt_hw_interrupt_disable();
if (serial->config.bufsz == 0) {
if (serial->config.bufsz == 0)
{
int result = RT_EOK;
struct rt_serial_rx_dma *rx_dma;
@ -272,21 +284,23 @@ rt_inline int _serial_dma_rx(struct rt_serial_device *serial, rt_uint8_t *data,
rt_set_errno(result);
return 0;
} else {
}
else
{
struct rt_serial_rx_fifo *rx_fifo = (struct rt_serial_rx_fifo *) serial->serial_rx;
rt_size_t recv_len = 0, fifo_recved_len = rt_dma_calc_recved_len(serial);
RT_ASSERT(rx_fifo != RT_NULL);
if (length < fifo_recved_len) {
if (length < fifo_recved_len)
recv_len = length;
} else {
else
recv_len = fifo_recved_len;
}
if (rx_fifo->get_index + recv_len < serial->config.bufsz) {
if (rx_fifo->get_index + recv_len < serial->config.bufsz)
rt_memcpy(data, rx_fifo->buffer + rx_fifo->get_index, recv_len);
} else {
else
{
rt_memcpy(data, rx_fifo->buffer + rx_fifo->get_index,
serial->config.bufsz - rx_fifo->get_index);
rt_memcpy(data + serial->config.bufsz - rx_fifo->get_index, rx_fifo->buffer,
@ -398,6 +412,7 @@ static rt_err_t rt_serial_open(struct rt_device *dev, rt_uint16_t oflag)
rt_memset(rx_fifo->buffer, 0, serial->config.bufsz);
rx_fifo->put_index = 0;
rx_fifo->get_index = 0;
rx_fifo->is_full = RT_FALSE;
serial->serial_rx = rx_fifo;
/* configure fifo address and length to low level device */
serial->ops->control(serial, RT_DEVICE_CTRL_CONFIG, (void *) RT_DEVICE_FLAG_DMA_RX);