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uart: add more channel_sts flags, wait for tx_fifo_empty() before sending

This commit is contained in:
Astro 2019-05-23 15:36:34 +02:00
parent 673d585d2f
commit 7428fec200
2 changed files with 25 additions and 0 deletions
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6
src/uart/mod.rs
View File

@ -146,10 +146,16 @@ impl Uart {
pub fn tx_fifo_full(&self) -> bool { pub fn tx_fifo_full(&self) -> bool {
self.regs.channel_sts.read().txfull() self.regs.channel_sts.read().txfull()
} }
pub fn tx_fifo_empty(&self) -> bool {
self.regs.channel_sts.read().txempty()
}
} }
impl fmt::Write for Uart { impl fmt::Write for Uart {
fn write_str(&mut self, s: &str) -> Result<(), fmt::Error> { fn write_str(&mut self, s: &str) -> Result<(), fmt::Error> {
while !self.tx_fifo_empty() {}
for b in s.bytes() { for b in s.bytes() {
self.write_byte(b); self.write_byte(b);
} }

19
src/uart/regs.rs
View File

@ -74,7 +74,26 @@ register!(baud_rate_gen, BaudRateGen, RW, u32);
register_bits!(baud_rate_gen, cd, u16, 0, 15); register_bits!(baud_rate_gen, cd, u16, 0, 15);
register!(channel_sts, ChannelSts, RO, u32); register!(channel_sts, ChannelSts, RO, u32);
/// Transmitter FIFO Nearly Full
register_bit!(channel_sts, tnful, 14);
/// Tx FIFO fill level is greater than or equal to TTRIG?
register_bit!(channel_sts, ttrig, 13);
/// Rx FIFO fill level is greater than or equal to FDEL?
register_bit!(channel_sts, flowdel, 12);
/// Transmitter state machine active?
register_bit!(channel_sts, tactive, 11);
/// Receiver state machine active?
register_bit!(channel_sts, ractive, 10);
/// Tx FIFO is full?
register_bit!(channel_sts, txfull, 4); register_bit!(channel_sts, txfull, 4);
/// Tx FIFO is empty?
register_bit!(channel_sts, txempty, 3);
/// Rx FIFO is full?
register_bit!(channel_sts, rxfull, 2);
/// Rx FIFO is empty?
register_bit!(channel_sts, rxempty, 1);
/// Rx FIFO fill level is greater than or equal to RTRIG?
register_bit!(channel_sts, rxovr, 0);
register!(tx_rx_fifo, TxRxFifo, RW, u32); register!(tx_rx_fifo, TxRxFifo, RW, u32);
register_bits!(tx_rx_fifo, data, u32, 0, 31); register_bits!(tx_rx_fifo, data, u32, 0, 31);