pw_uart_mcuxpresso: Add support for configuring flow control

Set default values for flow_control,parity,stop_bits Bug: 368150004 Change-Id: I0e6982eac9ce13f2a609eeea7fcf0c7e83d0b486 Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/236896 Presubmit-Verified: CQ Bot Account <[email protected]> Lint: Lint 🤖 <[email protected]> Pigweed-Auto-Submit: Austin Foxley <[email protected]> Reviewed-by: Jonathon Reinhart <[email protected]> Docs-Not-Needed: Austin Foxley <[email protected]> Commit-Queue: Auto-Submit <[email protected]>
google · Sep 19, 2024 · e8ab2b0 · e8ab2b0
1 parent c1c7dac
commit e8ab2b0
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Showing 3 changed files with 12 additions and 7 deletions.
diff --git a/pw_uart_mcuxpresso/dma_uart.cc b/pw_uart_mcuxpresso/dma_uart.cc
@@ -64,6 +64,7 @@ Status DmaUartMcuxpresso::Init() {
   USART_GetDefaultConfig(&defconfig_);
 
   defconfig_.baudRate_Bps = config_.baud_rate;
+  defconfig_.enableHardwareFlowControl = config_.flow_control;
   defconfig_.parityMode = config_.parity;
   defconfig_.enableTx = true;
   defconfig_.enableRx = true;

diff --git a/pw_uart_mcuxpresso/dma_uart_example.cc b/pw_uart_mcuxpresso/dma_uart_example.cc
@@ -23,6 +23,7 @@ pw::Status DmaUartExample() {
   constexpr uint32_t kFlexcomm = 0;
   const auto kUartBase = USART0;
   constexpr uint32_t kBaudRate = 115200;
+  constexpr bool kFlowControl = true;
   constexpr uint32_t kUartInstance = 5;
   std::array<std::byte, 65536> ring_buffer = {};
   constexpr uint32_t kUartRxDmaCh = 0;
@@ -33,6 +34,7 @@ pw::Status DmaUartExample() {
   const pw::uart::DmaUartMcuxpresso::Config kConfig = {
       .usart_base = kUartBase,
       .baud_rate = kBaudRate,
+      .flow_control = kFlowControl,
       .parity = kUSART_ParityDisabled,
       .stop_bits = kUSART_OneStopBit,
       .dma_base = DMA0,

diff --git a/pw_uart_mcuxpresso/public/pw_uart_mcuxpresso/dma_uart.h b/pw_uart_mcuxpresso/public/pw_uart_mcuxpresso/dma_uart.h
@@ -32,13 +32,15 @@ class DmaUartMcuxpresso final : public Uart {
  public:
   // Configuration structure
   struct Config {
-    USART_Type* usart_base;            // Base of USART control struct
-    uint32_t baud_rate;                // Desired communication speed
-    usart_parity_mode_t parity;        // Parity setting
-    usart_stop_bit_count_t stop_bits;  // Number of stop bits to use
-    DMA_Type* dma_base;                // Base of DMA control struct
-    uint32_t rx_dma_ch;                // Receive DMA channel
-    uint32_t tx_dma_ch;                // Transmit DMA channel
+    USART_Type* usart_base;     // Base of USART control struct
+    uint32_t baud_rate;         // Desired communication speed
+    bool flow_control = false;  // Hardware flow control setting
+    usart_parity_mode_t parity = kUSART_ParityDisabled;  // Parity setting
+    usart_stop_bit_count_t stop_bits =
+        kUSART_OneStopBit;  // Number of stop bits to use
+    DMA_Type* dma_base;     // Base of DMA control struct
+    uint32_t rx_dma_ch;     // Receive DMA channel
+    uint32_t tx_dma_ch;     // Transmit DMA channel
     inputmux_signal_t rx_input_mux_dmac_ch_request_en;  // Rx input mux signal
     inputmux_signal_t tx_input_mux_dmac_ch_request_en;  // Tx input mux signal
     ByteSpan buffer;                                    // Receive ring buffer