/**
* put a character into ring buffer
*
* When the buffer is full, it will discard one old data.
*/
rt_size_t rt_ringbuffer_putchar_force(struct rt_ringbuffer *rb, const rt_uint8_t ch)
{
enum rt_ringbuffer_state old_state;
RT_ASSERT(rb != RT_NULL);
old_state = rt_ringbuffer_status(rb);
rb->buffer_ptr[rb->write_index] = ch;
/* flip mirror */
if (rb->write_index == rb->buffer_size-1)
{
rb->write_mirror = ~rb->write_mirror;
rb->write_index = 0;
if (old_state == RT_RINGBUFFER_FULL)
{
rb->read_mirror = ~rb->read_mirror;
rb->read_index = rb->write_index;
}
}
else
{
rb->write_index++;
if (old_state == RT_RINGBUFFER_FULL)
rb->read_index = rb->write_index;
}
return 1;
}
static inline rt_uint8_t _is_wrtnode2r_spi_stm32_write_buf_full(void)
{
return (RT_RINGBUFFER_FULL == rt_ringbuffer_status(&spi_bridge.write_buf));
}
static inline rt_uint8_t _is_wrtnode2r_spi_stm32_read_buf_empty(void)
{
return (RT_RINGBUFFER_EMPTY == rt_ringbuffer_status(&spi_bridge.read_buf));
}