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Add uart_is_busy() method for UART devices #711

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Nov 1, 2023
Merged

Add uart_is_busy() method for UART devices #711

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5 changes: 5 additions & 0 deletions rp2040-hal/src/uart/peripheral.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -161,6 +161,11 @@ impl<D: UartDevice, P: ValidUartPinout<D>> UartPeripheral<Enabled, D, P> {
super::writer::uart_is_writable(&self.device)
}

/// Is the UART still busy transmitting data?
pub fn uart_is_busy(&self) -> bool {
super::writer::uart_is_busy(&self.device)
}

/// Is there data in the UART RX FIFO ready to be read?
pub fn uart_is_readable(&self) -> bool {
super::reader::is_readable(&self.device)
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6 changes: 6 additions & 0 deletions rp2040-hal/src/uart/writer.rs
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Expand Up @@ -41,6 +41,12 @@ pub(crate) fn uart_is_writable(rb: &RegisterBlock) -> bool {
rb.uartfr.read().txff().bit_is_clear()
}

/// Returns `true` if the UART is busy transmitting data, `false` after all
/// bits (including stop bits) have been transmitted.
pub(crate) fn uart_is_busy(rb: &RegisterBlock) -> bool {
rb.uartfr.read().busy().bit_is_set()
}

/// Writes bytes to the UART.
///
/// This function writes as long as it can. As soon that the FIFO is full,
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