Add framework (only) for STM32 USART support

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2094 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 176 insertions, 0 deletions

diff --git a/nuttx/arch/arm/src/stm32/stm32_lowputc.c b/nuttx/arch/arm/src/stm32/stm32_lowputc.c
new file mode 100644
index 000000000..4ed14ee23
--- /dev/null
+++ b/nuttx/arch/arm/src/stm32/stm32_lowputc.c
@@ -0,0 +1,176 @@
+/**************************************************************************
+ * arch/arm/src/stm32/stm32_lowputc.c
+ *
+ *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ **************************************************************************/
+
+/**************************************************************************
+ * Included Files
+ **************************************************************************/
+
+#include <nuttx/config.h>
+#include <sys/types.h>
+
+#include "up_internal.h"
+#include "up_arch.h"
+
+#include "chip.h"
+#include "stm32_internal.h"
+
+/**************************************************************************
+ * Private Definitions
+ **************************************************************************/
+
+/* Configuration **********************************************************/
+
+/* Is there a serial console? */
+
+#if defined(CONFIG_USART1_SERIAL_CONSOLE) && !defined(CONFIG_USART1_DISABLE)
+#  undef CONFIG_USART2_SERIAL_CONSOLE
+#  undef CONFIG_USART3_SERIAL_CONSOLE
+#  define HAVE_CONSOLE 1
+#elif defined(CONFIG_USART2_SERIAL_CONSOLE) && !defined(CONFIG_USART2_DISABLE)
+#  undef CONFIG_USART1_SERIAL_CONSOLE
+#  undef CONFIG_USART3_SERIAL_CONSOLE
+#  define HAVE_CONSOLE 1
+#elif defined(CONFIG_USART3_SERIAL_CONSOLE) && !defined(CONFIG_USART3_DISABLE)
+#  undef CONFIG_USART1_SERIAL_CONSOLE
+#  undef CONFIG_USART2_SERIAL_CONSOLE
+#  define HAVE_CONSOLE 1
+#else
+#  undef CONFIG_USART1_SERIAL_CONSOLE
+#  undef CONFIG_USART2_SERIAL_CONSOLE
+#  undef CONFIG_USART3_SERIAL_CONSOLE
+#  undef HAVE_CONSOLE
+#endif
+
+/* Select USART parameters for the selected console */
+
+#if defined(CONFIG_USART1_SERIAL_CONSOLE)
+#  define STM32_CONSOLE_BASE     STM32_USART1_BASE
+#  define STM32_CONSOLE_BAUD     CONFIG_USART1_BAUD
+#  define STM32_CONSOLE_BITS     CONFIG_USART1_BITS
+#  define STM32_CONSOLE_PARITY   CONFIG_USART1_PARITY
+#  define STM32_CONSOLE_2STOP    CONFIG_USART1_2STOP
+#elif defined(CONFIG_USART2_SERIAL_CONSOLE)
+#  define STM32_CONSOLE_BASE     STM32_USART2_BASE
+#  define STM32_CONSOLE_BAUD     CONFIG_USART2_BAUD
+#  define STM32_CONSOLE_BITS     CONFIG_USART2_BITS
+#  define STM32_CONSOLE_PARITY   CONFIG_USART2_PARITY
+#  define STM32_CONSOLE_2STOP    CONFIG_USART2_2STOP
+#elif defined(CONFIG_USART3_SERIAL_CONSOLE)
+#  define STM32_CONSOLE_BASE     STM32_USART2_BASE
+#  define STM32_CONSOLE_BAUD     CONFIG_USART2_BAUD
+#  define STM32_CONSOLE_BITS     CONFIG_USART2_BITS
+#  define STM32_CONSOLE_PARITY   CONFIG_USART2_PARITY
+#  define STM32_CONSOLE_2STOP    CONFIG_USART2_2STOP
+#else
+#  error "No CONFIG_USARTn_SERIAL_CONSOLE Setting"
+#endif
+
+/* Calculate BAUD rate from the SYS clock */
+
+/**************************************************************************
+ * Private Types
+ **************************************************************************/
+
+/**************************************************************************
+ * Private Function Prototypes
+ **************************************************************************/
+
+/**************************************************************************
+ * Global Variables
+ **************************************************************************/
+
+/**************************************************************************
+ * Private Variables
+ **************************************************************************/
+
+/**************************************************************************
+ * Private Functions
+ **************************************************************************/
+
+/**************************************************************************
+ * Public Functions
+ **************************************************************************/
+
+/**************************************************************************
+ * Name: up_lowputc
+ *
+ * Description:
+ *   Output one byte on the serial console
+ *
+ **************************************************************************/
+
+void up_lowputc(char ch)
+{
+#ifdef HAVE_CONSOLE
+  /* Wait until the TX FIFO is not full */
+
+
+  /* Then send the character */
+#endif
+}
+
+/**************************************************************************
+ * Name: up_lowsetup
+ *
+ * Description:
+ *   This performs basic initialization of the USART used for the serial
+ *   console.  Its purpose is to get the console output availabe as soon
+ *   as possible.
+ *
+ **************************************************************************/
+
+void up_lowsetup(void)
+{
+  /* Enable the selected USARTs and configure GPIO pins need byed the
+   * the selected USARTs.  NOTE: The serial driver later depends on
+   * this pin configuration -- whether or not a serial console is selected.
+   */
+
+#ifndef CONFIG_USART1_DISABLE
+#endif
+
+#ifndef CONFIG_USART1_DISABLE
+#endif
+
+#ifndef CONFIG_USART2_DISABLE
+#endif
+
+  /* Enable and configure the selected console device */
+
+#if defined(HAVE_CONSOLE) && !defined(CONFIG_SUPPRESS_USART_CONFIG)
+#endif
+}
+
+