Basic clocking and UART works

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

arch/arm/src/lm3s/lm3s_internal.h

@@ -183,7 +183,7 @@
 #define GPIO_PWM4_CCP    (GPIO_FUNC_PFIO | GPIO_PORTC | 7)       /* PC7: Capture/Compare/PWM4 (CCP4) */
 #define GPIO_UART1_RX    (GPIO_FUNC_PFINPUT | GPIO_PORTD | 2)    /* PD2: UART 1 receive (U1Rx) */
 #define GPIO_UART1_TX    (GPIO_FUNC_PFOUTPUT | GPIO_PORTD | 3)   /* PD3: UART 1 transmit (U1Tx) */
-#define GPIO_SSI1_CLK    (GPIO_FUNC_PFIO1 | GPIO_PORTE | 0)      /* PE0: SSI1 clock (SSI1Clk) */
+#define GPIO_SSI1_CLK    (GPIO_FUNC_PFIO | GPIO_PORTE | 0)       /* PE0: SSI1 clock (SSI1Clk) */
 #define GPIO_SSI1_FSS    (GPIO_FUNC_PFIO | GPIO_PORTE | 1)       /* PE1: SSI1 frame (SSI1Fss) */
 #define GPIO_SSI1_RX     (GPIO_FUNC_PFINPUT | GPIO_PORTE | 2)    /* PE2: SSI1 receive (SSI1Rx) */
 #define GPIO_SSI1_TX     (GPIO_FUNC_PFOUTPUT | GPIO_PORTE | 3)   /* PE3: SSI1 transmit (SSI1Tx) */

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
 }