Fix GCC_ARM warnings

Signed-off-by: Sadik.Ozer <Sadik.Ozer@maximintegrated.com>

Author: Sadik.Ozer

targets/TARGET_Maxim/TARGET_MAX32670/Libraries/PeriphDrivers/Source/RTC/rtc_reva.c

@@ -325,7 +325,7 @@ int MXC_RTC_RevA_GetTime(uint32_t* sec, uint32_t* subsec)
         // Read the seconds count.
         temp_sec = MXC_RTC_RevA_GetSecond();
 
-        if (temp_sec == E_BUSY) {
+        if ((int)temp_sec == E_BUSY) {
             return E_BUSY;
         }
 

targets/TARGET_Maxim/TARGET_MAX32670/Libraries/PeriphDrivers/Source/SPI/spi_me15.c

@@ -51,11 +51,7 @@
 int MXC_SPI_Init(mxc_spi_regs_t* spi, int masterMode, int quadModeUsed, int numSlaves,
                  unsigned ssPolarity, unsigned int hz, unsigned int drv_ssel)
 {
-    int spi_num;
-    
-    spi_num = MXC_SPI_GET_IDX(spi);
-    MXC_ASSERT(spi_num >= 0);
-    
+
     if (numSlaves > MXC_SPI_SS_INSTANCES) {
         return E_BAD_PARAM;
     }
@@ -91,11 +87,7 @@ int MXC_SPI_Init(mxc_spi_regs_t* spi, int masterMode, int quadModeUsed, int numS
 }
 
 int MXC_SPI_Shutdown(mxc_spi_regs_t* spi)
-{
-    int spi_num;
-    spi_num = MXC_SPI_GET_IDX(spi);
-    MXC_ASSERT(spi_num >= 0);
-    
+{    
     MXC_SPI_RevA_Shutdown ((mxc_spi_reva_regs_t*) spi);
 
     if (spi == MXC_SPI0) {

targets/TARGET_Maxim/TARGET_MAX32670/Libraries/PeriphDrivers/Source/SPI/spi_reva.c

@@ -803,7 +803,10 @@ uint32_t MXC_SPI_RevA_TransHandler (mxc_spi_reva_regs_t *spi, mxc_spi_reva_req_t
     uint32_t tx_length = 0, rx_length = 0;
     uint8_t bits;
     spi_num = MXC_SPI_GET_IDX ((mxc_spi_regs_t*) spi);
-    
+    if (spi_num == -1) {
+        return E_BAD_PARAM;
+    }
+
     bits = MXC_SPI_GetDataSize ((mxc_spi_regs_t*) req->spi);
 
     //MXC_F_SPI_REVA_CTRL2_NUMBITS data bits

targets/TARGET_Maxim/TARGET_MAX32670/Libraries/PeriphDrivers/Source/UART/uart_me15.c

@@ -167,8 +167,8 @@ int MXC_UART_ReadyForSleep(mxc_uart_regs_t* uart)
 int MXC_UART_SetFrequency(mxc_uart_regs_t* uart, unsigned int baud, mxc_uart_clock_t clock)
 {
     int freq;
-    int mod = 0;
-    int clkdiv = 0;
+    unsigned int mod = 0;
+    unsigned int clkdiv = 0;
     int div = 8;
 
     if (MXC_UART_GET_IDX (uart) < 0) {
@@ -230,7 +230,7 @@ int MXC_UART_SetFrequency(mxc_uart_regs_t* uart, unsigned int baud, mxc_uart_clo
         freq = MXC_UART_GetFrequency (uart);
     } 
     else {
-		int clkDiv = 0, mod = 0;
+		unsigned int clkDiv = 0, mod = 0;
 		if (MXC_UART_GET_IDX ((mxc_uart_regs_t*) uart) < 0) {
 			return E_BAD_PARAM;
 		}

targets/TARGET_Maxim/TARGET_MAX32670/Libraries/PeriphDrivers/Source/UART/uart_revb.c

@@ -115,7 +115,7 @@ int MXC_UART_RevB_ReadyForSleep (mxc_uart_revb_regs_t* uart)
 
 int MXC_UART_RevB_SetFrequency (mxc_uart_revb_regs_t* uart, unsigned int baud, mxc_uart_revb_clock_t clock)
 {  
-    int clkDiv = 0, mod = 0;
+    unsigned int clkDiv = 0, mod = 0;
     if (MXC_UART_GET_IDX ((mxc_uart_regs_t*) uart) < 0) {
         return E_BAD_PARAM;
     }