Fix warning and add n-bit rand

extralibs/lib_rand.h

@@ -87,6 +87,27 @@ uint32_t _rand_gen_32b(void)
 }
 
 
+
+/// @brief Generates a Random n-bit number, using the LFSR - by generating
+/// a random bit from LFSR taps, n times.
+/// @param None
+/// @return a (psuedo)random n-bit value
+uint32_t _rand_gen_nb( int bits)
+{
+	uint32_t rand_out = 0;
+
+	while(bits--)
+	{
+		// Shift the current rand value for the new LSB
+		rand_out = rand_out << 1;
+		// Append the LSB
+		rand_out |= _rand_lfsr_update();
+	}
+
+	return rand_out;
+}
+
+
 /*** API Functions ***********************************************************/
 /*****************************************************************************/
 /// @brief seeds the Random LFSR to the value passed

extralibs/ssd1306_spi.h

@@ -100,7 +100,7 @@ uint8_t ssd1306_pkt_send(uint8_t *data, uint8_t sz, uint8_t cmd)
 	}
 
 	// wait for not busy before exiting
-	while(SPI1->STATR & SPI_STATR_BSY);
+	while(SPI1->STATR & SPI_STATR_BSY) { }
 
 	funDigitalWrite( SSD1306_CS_PIN, FUN_HIGH );