Add WriteLine() to pw_dumb_io

Adds WriteLine() to pw_dumb_io, and updates all function names to use
read/write.

Change-Id: I0c3358fa264f9a5e7c8b49736e960015df0e67fc

2 files changed, 19 insertions, 2 deletions

diff --git a/pw_dumb_io_baremetal_stm32f429/BUILD.gn b/pw_dumb_io_baremetal_stm32f429/BUILD.gn
index d467a41d1..1bc300dc6 100644
--- a/pw_dumb_io_baremetal_stm32f429/BUILD.gn
+++ b/pw_dumb_io_baremetal_stm32f429/BUILD.gn
@@ -30,6 +30,7 @@ source_set("pw_dumb_io_baremetal_stm32f429") {
     ":linker_script",
   ]
   deps = [
+    "$dir_pw_dumb_io:default_putget_bytes",
     "$dir_pw_dumb_io:facade",
     "$dir_pw_preprocessor",
   ]
diff --git a/pw_dumb_io_baremetal_stm32f429/dumb_io_baremetal.cc b/pw_dumb_io_baremetal_stm32f429/dumb_io_baremetal.cc
index 110e44c19..322aebb0f 100644
--- a/pw_dumb_io_baremetal_stm32f429/dumb_io_baremetal.cc
+++ b/pw_dumb_io_baremetal_stm32f429/dumb_io_baremetal.cc
@@ -168,7 +168,7 @@ namespace pw::dumb_io {
 // Wait for a byte to read on USART1. This blocks until a byte is read. This is
 // extremely inefficient as it requires the target to burn CPU cycles polling to
 // see if a byte is ready yet.
-Status GetByte(std::byte* dest) {
+Status ReadByte(std::byte* dest) {
   while (true) {
     if (usart1.status & kReadDataReady) {
       *dest = static_cast<std::byte>(usart1.data_register);
@@ -181,7 +181,7 @@ Status GetByte(std::byte* dest) {
 // inefficient. At the default baud rate of 115200, one byte blocks the CPU for
 // ~87 micro seconds. This means it takes only 10 bytes to block the CPU for
 // 1ms!
-Status PutByte(std::byte b) {
+Status WriteByte(std::byte b) {
   // Wait for TX buffer to be empty. When the buffer is empty, we can write
   // a value to be dumped out of UART.
   while (!(usart1.status & kTxRegisterEmpty)) {
@@ -190,4 +190,20 @@ Status PutByte(std::byte b) {
   return Status::OK;
 }
 
+// Writes a string using pw::dumb_io, and add newline characters at the end.
+StatusWithSize WriteLine(const std::string_view& s) {
+  size_t chars_written = 0;
+  StatusWithSize result = WriteBytes(as_bytes(span(s)));
+  if (!result.ok()) {
+    return result;
+  }
+  chars_written += result.size();
+
+  // Write trailing newline ("\n\r").
+  result = WriteBytes(as_bytes(span("\n\r", 2)));
+  chars_written += result.size();
+
+  return StatusWithSize(result.status(), chars_written);
+}
+
 }  // namespace pw::dumb_io