More fixes to problems noted by cppcheck. Some are kind of risky; some are real bugs.

configs/ea3131/src/up_mem.c

@@ -157,7 +157,6 @@
 
 static void lpc31_sdraminitialize(void)
 {
-  uint32_t tmp;
   uint32_t regval;
 
   /* These run-time calculations can be reduced dramatically if hclk is
@@ -266,7 +265,7 @@ static void lpc31_sdraminitialize(void)
    * 16bit mode
    */
 
-  tmp = getreg32(LPC31_EXTSDRAM0_VSECTION | (0x23 << 13));
+  (void)getreg32(LPC31_EXTSDRAM0_VSECTION | (0x23 << 13));
 
   putreg32((MPMC_DYNCONFIG0_MDSDRAM|MPMC_DYNCONFIG_HP16_32MX16),
            LPC31_MPMC_DYNCONFIG0);

configs/ea3152/src/up_mem.c

@@ -157,7 +157,6 @@
 
 static void lpc31_sdraminitialize(void)
 {
-  uint32_t tmp;
   uint32_t regval;
 
   /* These run-time calculations can be reduced dramatically if hclk is
@@ -266,7 +265,7 @@ static void lpc31_sdraminitialize(void)
    * 16bit mode
    */
 
-  tmp = getreg32(LPC31_EXTSDRAM0_VSECTION | (0x23 << 13));
+  (void)getreg32(LPC31_EXTSDRAM0_VSECTION | (0x23 << 13));
 
   putreg32((MPMC_DYNCONFIG0_MDSDRAM|MPMC_DYNCONFIG_HP16_32MX16),
            LPC31_MPMC_DYNCONFIG0);

configs/mikroe-stm32f4/src/up_clockconfig.c

@@ -146,5 +146,5 @@ void stm32_board_clockconfig(void)
 
   while ((getreg32(STM32_RCC_CFGR) & RCC_CFGR_SWS_MASK) != RCC_CFGR_SWS_PLL)
     ;
-#endif
 }
+#endif

configs/mikroe-stm32f4/src/up_nsh.c

@@ -169,7 +169,11 @@ int nsh_archinitialize(void)
   FAR struct spi_dev_s *spi;
   FAR struct mtd_dev_s *mtd;
 #endif
+#if defined(NSH_HAVEMMCSD) || defined(HAVE_USBHOST) || \
+    defined(HAVE_USBMONITOR) || defined(CONFIG_LCD_MIO283QT2) || \
+    defined(CONFIG_LCD_MIO283QT9A)
   int ret;
+#endif
 
   /* Configure SPI-based devices */
 

configs/mikroe-stm32f4/src/up_touchscreen.c

@@ -435,7 +435,6 @@ static void tc_adc_init(void)
   regval = tc_adc_getreg(STM32_ADC_SQR3_OFFSET) & ADC_SQR3_RESERVED;
   regval |= LCD_YD_CHANNEL;
   tc_adc_putreg(STM32_ADC_SQR3_OFFSET, regval);
-  regval = tc_adc_getreg(STM32_ADC_SQR3_OFFSET);
 
   /* Set the number of conversions = 1 */
 

configs/mx1ads/src/up_boot.c

@@ -101,7 +101,7 @@ void imx_boardinitialize(void)
   imxgpio_configprimary(GPIOA, 21);
   imxgpio_configprimary(GPIOA, 22);
 
-  regval = getreg32(IMX_CS4_VSECTION + 0x0c);
+  (void)getreg32(IMX_CS4_VSECTION + 0x0c);
-  regval = getreg32(IMX_CS4_VSECTION + 0x0c);
+  (void)getreg32(IMX_CS4_VSECTION + 0x0c);
 #endif
 }

configs/olimex-lpc-h3131/src/lpc31_mem.c

@@ -137,7 +137,6 @@ static uint32_t lpc31_ns2clk(uint32_t ns, uint32_t hclk2)
 
 static inline void lpc31_sdraminitialize(void)
 {
-  uint32_t tmp;
   uint32_t regval;
 
   /* These run-time calculations can be reduced dramatically if hclk is
@@ -254,7 +253,7 @@ static inline void lpc31_sdraminitialize(void)
    * 16bit mode
    */
 
-  tmp = getreg32(LPC31_EXTSDRAM0_VSECTION | (0x23 << 12));
+  (void)getreg32(LPC31_EXTSDRAM0_VSECTION | (0x23 << 12));
 
   /* Select normal operating mode */
 

configs/olimex-stm32-h405/src/stm32_nsh.c

@@ -59,6 +59,10 @@
  * Pre-Processor Definitions
  ****************************************************************************/
 
+#if !defined(CONFIG_STM32_CAN1) && !defined(CONFIG_STM32_CAN2)
+#  undef CONFIG_CAN
+#endif
+
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -84,7 +88,7 @@ int nsh_archinitialize(void)
   int ret;
 #endif
 
-#if defined(CONFIG_CAN) && (defined(CONFIG_STM32_CAN1) || defined(CONFIG_STM32_CAN2))
+#ifdef CONFIG_CAN
   /* Configure on-board CAN if CAN support has been selected. */
 
   ret = stm32_can_initialize();

configs/open1788/src/lpc17_sdraminitialize.c

@@ -109,11 +109,6 @@
 void open1788_sdram_initialize(void)
 {
   uint32_t regval;
-#ifdef CONFIG_LPC17_SDRAM_16BIT
-  volatile uint16_t dummy;
-#else
-  volatile uint32_t dummy;
-#endif
   int i;
 
   /* Reconfigure delays:
@@ -211,9 +206,9 @@ void open1788_sdram_initialize(void)
            LPC17_EMC_DYNAMICCONTROL);
 
 #ifdef CONFIG_LPC17_SDRAM_16BIT
-  dummy = getreg16(SDRAM_BASE | (0x33 << 12));  /* 8 burst, 3 CAS latency */
+  (void)getreg16(SDRAM_BASE | (0x33 << 12));  /* 8 burst, 3 CAS latency */
 #elif defined CONFIG_LPC17_SDRAM_32BIT
-  dummy = getreg32(SDRAM_BASE | (0x32 << 13)); /* 4 burst, 3 CAS latency */
+  (void)getreg32(SDRAM_BASE | (0x32 << 13)); /* 4 burst, 3 CAS latency */
 #endif
 
   /* Issue NORMAL command */

configs/shenzhou/src/up_ili93xx.c

@@ -1197,14 +1197,14 @@ static int stm32_setpower(struct lcd_dev_s *dev, int power)
       else
 #endif
 #ifndef CONFIG_STM32_ILI9320_DISABLE
-      if (priv->type == LCD_TYPE_ILI9300)
+      if (priv->type == LCD_TYPE_ILI9320)
         {
           stm32_writereg(priv, LCD_REG_7, 0x0173);
         }
       else
 #endif
 #ifndef CONFIG_STM32_ILI9321_DISABLE
-      if (priv->type == LCD_TYPE_ILI9300)
+      if (priv->type == LCD_TYPE_ILI9321)
         {
           stm32_writereg(priv, LCD_REG_7, 0x0173);
         }

configs/stm32f4discovery/src/stm32_usb.c

@@ -170,7 +170,10 @@ void stm32_usbinitialize(void)
 int stm32_usbhost_initialize(void)
 {
   int pid;
+#if defined(CONFIG_USBHOST_MSC) || defined(CONFIG_USBHOST_HIDKBD) || \
+    defined(CONFIG_USBHOST_HIDMOUSE)
   int ret;
+#endif
 
   /* First, register all of the class drivers needed to support the drivers
    * that we care about:

configs/vsn/src/sif.c

@@ -577,7 +577,8 @@ int sif_main(int argc, char *argv[])
                 }
                 else if (status != 0) {
                     if (stpage != 0xFFFF) {
-                        printf("Free Range:\t%d\t-\t%d\n", stpage, page-2);
+                        printf("Free Range:\t%lu\t-\t%lu\n",
+                               (unsigned long)stpage, (unsigned long)(page-2));
                         stpage = 0xFFFF;
                     }
                 }
@@ -594,8 +595,8 @@ int sif_main(int argc, char *argv[])
             size_t page = atoi(argv[2]);
             size_t addr = page * up_progmem_pagesize(page);
 
-            printf("Write result: %d (writing to address %xh)\n",
+            printf("Write result: %d (writing to address %lxh)\n",
-                up_progmem_write(addr, "Test", 4), addr);
+                up_progmem_write(addr, "Test", 4), (unsigned long)addr);
             return 0;
         }
         else if (!strcmp(argv[1], "i2c") && argc == 3) {