From 9f1b0571589985f9aaed28f12a0af9c55c56a0c1 Mon Sep 17 00:00:00 2001
From: patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3>
Date: Sat, 9 Feb 2013 15:03:49 +0000
Subject: Removed stm32_internal.h; Changes for clean compile of
 STM32F3Discovery configuration with SPI and USB

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5630 42af7a65-404d-4744-a932-0658087f49c3
---
 nuttx/arch/arm/src/stm32/stm32_serial.c | 78 ++++++++++++++++++++++++++++++---
 1 file changed, 71 insertions(+), 7 deletions(-)

(limited to 'nuttx/arch/arm/src/stm32/stm32_serial.c')

diff --git a/nuttx/arch/arm/src/stm32/stm32_serial.c b/nuttx/arch/arm/src/stm32/stm32_serial.c
index 12da1ee10..30cc4f056 100644
--- a/nuttx/arch/arm/src/stm32/stm32_serial.c
+++ b/nuttx/arch/arm/src/stm32/stm32_serial.c
@@ -939,6 +939,66 @@ static int up_dma_nextrx(struct up_dev_s *priv)
 #ifndef CONFIG_SUPPRESS_UART_CONFIG
 static void up_setspeed(struct uart_dev_s *dev)
 {
+#ifdef CONFIG_STM32_STM32F30XX
+
+  /* This first implementation is for U[S]ARTs that support oversampling
+   * by 8 in additional to the standard oversampling by 16.
+   */
+
+  struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
+  uint32_t usartdiv8;
+  uint32_t cr1;
+  uint32_t brr;
+
+  /* In case of oversampling by 8, the equation is:
+   *
+   *   baud      = 2 * fCK / usartdiv8
+   *   usartdiv8 = 2 * fCK / baud
+   */
+
+   usartdiv8 = ((priv->apbclock << 1) + (priv->baud >> 1)) / priv->baud;
+
+  /* Baud rate for standard USART (SPI mode included):
+   *
+   * In case of oversampling by 16, the equation is:
+   *   baud       = fCK / usartdiv16
+   *   usartdiv16 = fCK / baud
+   *              = 2 * usartdiv8
+   */
+
+   /* Use oversamply by 8 only if the divisor is small.  But what is small? */
+
+   cr1 = up_serialin(priv, STM32_USART_CR1_OFFSET);
+   if (usartdiv8 > 100)
+     {
+       /* Use usartdiv16 */
+
+       brr  = (usartdiv8 + 1) >> 1;
+
+       /* Clear oversampling by 8 to enable oversampling by 16 */
+
+       cr1 &= ~USART_CR1_OVER8;
+     }
+   else
+     {
+       /* Perform mysterious operations on bits 0-3 */
+
+       brr  = ((usartdiv8 & 0xfff0) | ((usartdiv8 & 0x000f) >> 1));
+
+       /* Set oversampling by 8 */
+
+       cr1 |= USART_CR1_OVER8;
+     }
+
+   up_serialout(priv, STM32_USART_CR1_OFFSET, cr1);
+   up_serialout(priv, STM32_USART_BRR_OFFSET, brr);
+
+#else
+
+  /* This second implementation is for U[S]ARTs that support fractional
+   * dividers.
+   */
+
   struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
   uint32_t usartdiv32;
   uint32_t mantissa;
@@ -973,6 +1033,8 @@ static void up_setspeed(struct uart_dev_s *dev)
    fraction   = (usartdiv32 - (mantissa << 5) + 1) >> 1;
    brr       |= fraction << USART_BRR_FRAC_SHIFT;
    up_serialout(priv, STM32_USART_BRR_OFFSET, brr);
+
+#endif
 }
 #endif
 
@@ -1031,6 +1093,7 @@ static int up_setup(struct uart_dev_s *dev)
     {
       regval |= USART_CR2_STOP2;
     }
+
   up_serialout(priv, STM32_USART_CR2_OFFSET, regval);
 
   /* Configure CR1 */
@@ -1077,6 +1140,7 @@ static int up_setup(struct uart_dev_s *dev)
   regval      = up_serialin(priv, STM32_USART_CR1_OFFSET);
   regval     |= (USART_CR1_UE|USART_CR1_TE|USART_CR1_RE);
   up_serialout(priv, STM32_USART_CR1_OFFSET, regval);
+
 #endif
 
   /* Set up the cached interrupt enables value */
@@ -1119,7 +1183,7 @@ static int up_dma_setup(struct uart_dev_s *dev)
   /* Configure for circular DMA reception into the RX fifo */
 
   stm32_dmasetup(priv->rxdma,
-                 priv->usartbase + STM32_USART_DR_OFFSET,
+                 priv->usartbase + STM32_USART_RDR_OFFSET,
                  (uint32_t)priv->rxfifo,
                  RXDMA_BUFFER_SIZE,
                  SERIAL_DMA_CONTROL_WORD);
@@ -1351,7 +1415,7 @@ static int up_interrupt_common(struct up_dev_s *priv)
            * good byte will be lost.
            */
 
-          (void)up_serialin(priv, STM32_USART_DR_OFFSET);
+          (void)up_serialin(priv, STM32_USART_RDR_OFFSET);
         }
 
       /* Handle outgoing, transmit bytes */
@@ -1510,20 +1574,20 @@ static int up_ioctl(struct file *filep, int cmd, unsigned long arg)
 static int up_receive(struct uart_dev_s *dev, uint32_t *status)
 {
   struct up_dev_s *priv = (struct up_dev_s*)dev->priv;
-  uint32_t dr;
+  uint32_t rdr;
 
   /* Get the Rx byte */
 
-  dr       = up_serialin(priv, STM32_USART_DR_OFFSET);
+  rdr      = up_serialin(priv, STM32_USART_RDR_OFFSET);
 
   /* Get the Rx byte plux error information.  Return those in status */
 
-  *status  = priv->sr << 16 | dr;
+  *status  = priv->sr << 16 | rdr;
   priv->sr = 0;
 
   /* Then return the actual received byte */
 
-  return dr & 0xff;
+  return rdr & 0xff;
 }
 #endif
 
@@ -1693,7 +1757,7 @@ static void up_send(struct uart_dev_s *dev, int ch)
   if (priv->rs485_dir_gpio != 0)
     stm32_gpiowrite(priv->rs485_dir_gpio, priv->rs485_dir_polarity);
 #endif
-  up_serialout(priv, STM32_USART_DR_OFFSET, (uint32_t)ch);
+  up_serialout(priv, STM32_USART_TDR_OFFSET, (uint32_t)ch);
 }
 
 /****************************************************************************
-- 
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