Add support for SEGGER RTT STDIO (updated) (#1411)

Author: adfernandes

src/rp2_common/CMakeLists.txt

@@ -55,6 +55,7 @@ if (NOT PICO_BARE_METAL)
     pico_add_subdirectory(pico_stdio)
     pico_add_subdirectory(pico_stdio_semihosting)
     pico_add_subdirectory(pico_stdio_uart)
+    pico_add_subdirectory(pico_stdio_rtt)
 
     pico_add_subdirectory(cmsis)
     pico_add_subdirectory(tinyusb)
@@ -85,4 +86,4 @@ set(CMAKE_EXECUTABLE_SUFFIX "${CMAKE_EXECUTABLE_SUFFIX}" PARENT_SCOPE)
 pico_add_doxygen(${CMAKE_CURRENT_LIST_DIR})
 pico_add_doxygen_exclude(${CMAKE_CURRENT_LIST_DIR}/cmsis)
 
-pico_promote_common_scope_vars()
+pico_promote_common_scope_vars()

src/rp2_common/pico_stdio/include/pico/stdio.h

@@ -51,14 +51,14 @@ typedef struct stdio_driver stdio_driver_t;
 /*! \brief Initialize all of the present standard stdio types that are linked into the binary.
  * \ingroup pico_stdio
  *
- * Call this method once you have set up your clocks to enable the stdio support for UART, USB
- * and semihosting based on the presence of the respective libraries in the binary.
+ * Call this method once you have set up your clocks to enable the stdio support for UART, USB,
+ * semihosting, and RTT based on the presence of the respective libraries in the binary.
  *
  * When stdio_usb is configured, this method can be optionally made to block, waiting for a connection
  * via the variables specified in \ref stdio_usb_init (i.e. \ref PICO_STDIO_USB_CONNECT_WAIT_TIMEOUT_MS)
  *
  * \return true if at least one output was successfully initialized, false otherwise.
- * \see stdio_uart, stdio_usb, stdio_semihosting
+ * \see stdio_uart, stdio_usb, stdio_semihosting, stdio_rtt
  */
 bool stdio_init_all(void);
 

src/rp2_common/pico_stdio/stdio.c

@@ -32,6 +32,10 @@
 #include "pico/stdio_semihosting.h"
 #endif
 
+#if LIB_PICO_STDIO_RTT
+#include "pico/stdio_rtt.h"
+#endif
+
 #define STDIO_HANDLE_STDIN  0
 #define STDIO_HANDLE_STDOUT 1
 #define STDIO_HANDLE_STDERR 2
@@ -295,6 +299,11 @@ bool stdio_init_all(void) {
     rc = true;
 #endif
 
+#if LIB_PICO_STDIO_RTT
+    stdio_rtt_init();
+    rc = true;
+#endif
+
 #if LIB_PICO_STDIO_USB
     rc |= stdio_usb_init();
 #endif
@@ -331,7 +340,7 @@ void stdio_set_translate_crlf(stdio_driver_t *driver, bool enabled) {
     // Suppress -Wunused-parameter
     (void)driver;
     (void)enabled;
-    
+
     panic_unsupported();
 #endif
 }

src/rp2_common/pico_stdio_rtt/CMakeLists.txt

@@ -0,0 +1,15 @@
+pico_add_library(pico_stdio_rtt)
+
+target_sources(pico_stdio_rtt INTERFACE 
+    ${CMAKE_CURRENT_LIST_DIR}/stdio_rtt.c
+    ${CMAKE_CURRENT_LIST_DIR}/SEGGER/RTT/SEGGER_RTT.c)
+
+set_source_files_properties(${CMAKE_CURRENT_LIST_DIR}/SEGGER/RTT/SEGGER_RTT.c
+    PROPERTIES COMPILE_OPTIONS "-Wno-cast-qual;-Wno-cast-align")
+
+target_include_directories(pico_stdio_rtt_headers INTERFACE 
+    ${CMAKE_CURRENT_LIST_DIR}/include 
+    ${CMAKE_CURRENT_LIST_DIR}/SEGGER/RTT 
+    ${CMAKE_CURRENT_LIST_DIR}/SEGGER/Config)
+
+pico_mirrored_target_link_libraries(pico_stdio_rtt INTERFACE pico_stdio)