Basic clocking and UART works

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1786 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 32 insertions, 18 deletions

diff --git a/nuttx/arch/arm/src/lm3s/lm3s_lowputc.c b/nuttx/arch/arm/src/lm3s/lm3s_lowputc.c
index f6d5272ef..8ab1d1a47 100644
--- a/nuttx/arch/arm/src/lm3s/lm3s_lowputc.c
+++ b/nuttx/arch/arm/src/lm3s/lm3s_lowputc.c
@@ -220,47 +220,61 @@ void up_lowputc(char ch)
 
 void up_lowsetup(void)
 {
+  uint32 regval;
 #if defined(HAVE_CONSOLE) && !defined(CONFIG_SUPPRESS_UART_CONFIG)
   uint32 ctl;
+#endif
+
+  /* Enable the selected UARTs and configure GPIO pins to need by the
+   * the selected UARTs.  NOTE: The serial driver later depends on
+   * this pin configuration -- whether or not a serial console is selected.
+   */
+
+#ifndef CONFIG_UART0_DISABLE
+  regval  = getreg32(LM3S_SYSCON_RCGC1);
+  regval |= SYSCON_RCGC1_UART0;
+  putreg32(regval, LM3S_SYSCON_RCGC1);
+
+  lm3s_configgpio(GPIO_UART0_RX);
+  lm3s_configgpio(GPIO_UART0_TX);
+#endif
+
+#ifndef CONFIG_UART1_DISABLE
+  regval  = getreg32(LM3S_SYSCON_RCGC1);
+  regval |= SYSCON_RCGC1_UART1;
+  putreg32(regval, LM3S_SYSCON_RCGC1);
+
+  lm3s_configgpio(GPIO_UART1_RX);
+  lm3s_configgpio(GPIO_UART1_TX);
+#endif
 
   /* Enable the selected console device */
-  /* 1. Disable the UART by clearing the UARTEN bit in the UART CTL register */
+
+#if defined(HAVE_CONSOLE) && !defined(CONFIG_SUPPRESS_UART_CONFIG)
+  /* Disable the UART by clearing the UARTEN bit in the UART CTL register */
 
   ctl = getreg32(LM3S_CONSOLE_BASE+LM3S_UART_CTL_OFFSET);
   ctl &= ~UART_CTL_UARTEN;
   putreg32(ctl, LM3S_CONSOLE_BASE+LM3S_UART_CTL_OFFSET);
 
-  /* 2. Write the integer portion of the BRD to the UART IBRD register */
+  /* Write the integer portion of the BRD to the UART IBRD register */
 
   putreg32(LM3S_BRDI, LM3S_CONSOLE_BASE+LM3S_UART_IBRD_OFFSET);
 
-  /* 3. Write the fractional portion of the BRD to the UART FBRD register */
+  /* Write the fractional portion of the BRD to the UART FBRD register */
 
   putreg32(LM3S_DIVFRAC, LM3S_CONSOLE_BASE+LM3S_UART_FBRD_OFFSET);
 
-  /* 4. Write the desired serial parameters to the UART LCRH register */
+  /* Write the desired serial parameters to the UART LCRH register */
 
   putreg32(UART_LCRH_VALUE, LM3S_CONSOLE_BASE+LM3S_UART_LCRH_OFFSET);
 
-  /* 5. Enable the UART by setting the UARTEN bit in the UART CTL register */
+  /* Enable the UART by setting the UARTEN bit in the UART CTL register */
 
   ctl |= (UART_CTL_UARTEN|UART_CTL_TXE|UART_CTL_RXE);
   putreg32(ctl, LM3S_CONSOLE_BASE+LM3S_UART_CTL_OFFSET);
 #endif
 
-  /* Then configure GPIO pins to enable the selected UARTs.  NOTE: The
-   * serial driver later depends on this pin configuration.
-   */
-
-#ifndef CONFIG_UART0_DISABLE
-  lm3s_configgpio(GPIO_UART0_RX);
-  lm3s_configgpio(GPIO_UART0_TX);
-#endif
-
-#ifndef CONFIG_UART1_DISABLE
-  lm3s_configgpio(GPIO_UART1_RX);
-  lm3s_configgpio(GPIO_UART1_TX);
-#endif
 }