Add beginning of SAM3U GPIO config logic

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2512 42af7a65-404d-4744-a932-0658087f49c3

arch/arm/src/sam3u/sam3u_internal.h

@@ -55,7 +55,90 @@
 
 /* Configuration ********************************************************************/
 
-/* NVIC priority levels *************************************************************/
+/* Bit-encoded input to sam3u_configgpio() ******************************************/
+
+/* 16-bit Encoding:
+ * MMCC C... VPPB BBBB
+ */
+
+/* Input/Output mode:
+ *
+ * MM.. .... .... ....
+ */
+
+#define GPIO_CFG_SHIFT             (14)        /* Bits 14-15: GPIO mode */
+#define GPIO_CFG_MASK              (3 << GPIO_CNF_SHIFT)
+#  define GPIO_INPUT               (0 << GPIO_CNF_SHIFT) /* Input */
+#  define GPIO_OUTPUT              (1 << GPIO_CNF_SHIFT) /* Output */
+#  define GPIO_PERIPHA             (2 << GPIO_CNF_SHIFT) /* Controlled by periph A signal */
+#  define GPIO_PERIPHB             (3 << GPIO_CNF_SHIFT) /* Controlled by periph B signal */
+
+/* These bits set the configuration of the pin:
+ * ..CC C... .... ....
+ */
+
+#define GPIO_CFG_SHIFT             (11)        /* Bits 11-13: GPIO configuration bits */
+#define GPIO_CFG_MASK              (3 << GPIO_CNF_SHIFT)
+#  define GPIO_CFG_DEFAULT         (0 << GPIO_CNF_SHIFT) /* Default, no attribute */
+#  define GPIO_CFG_PULLUP          (1 << GPIO_CNF_SHIFT) /* Bit 11: Internal pull-up */
+#  define GPIO_CFG_DEGLITCH        (2 << GPIO_CNF_SHIFT) /* Bit 12: Internal glitch filter */
+#  define GPIO_CFG_OPENDRAIN       (4 << GPIO_CNF_SHIFT) /* Bit 13: Open drain */
+
+/* If the pin is an GPIO output, then this identifies the initial output value:
+ * .... .... V... ....
+ */
+
+#define GPIO_OUTPUT_SET            (1 << 7)    /* Bit 7: Inital value of output */
+#define GPIO_OUTPUT_CLEAR          (0) 
+
+/* This identifies the GPIO port:
+ * .... .... .PP. ....
+ */
+
+#define GPIO_PORT_SHIFT            (5)         /* Bit 5-6:  Port number */
+#define GPIO_PORT_MASK             (3 << GPIO_PORT_SHIFT)
+#  define GPIO_PORT_PIOA           (0 << GPIO_CNF_SHIFT)
+#  define GPIO_PORT_PIOB           (1 << GPIO_CNF_SHIFT)
+#  define GPIO_PORT_PIOC           (2 << GPIO_CNF_SHIFT)
+
+/* This identifies the bit in the port:
+ * .... .... ...B BBBB
+ */
+
+#define GPIO_PIN_SHIFT                0        /* Bits 0-3: GPIO number: 0-15 */
+#define GPIO_PIN_MASK                 (15 << GPIO_PIN_SHIFT)
+#define GPIO_PIN0                     (0  << GPIO_PIN_SHIFT)
+#define GPIO_PIN1                     (1  << GPIO_PIN_SHIFT)
+#define GPIO_PIN2                     (2  << GPIO_PIN_SHIFT)
+#define GPIO_PIN3                     (3  << GPIO_PIN_SHIFT)
+#define GPIO_PIN4                     (4  << GPIO_PIN_SHIFT)
+#define GPIO_PIN5                     (5  << GPIO_PIN_SHIFT)
+#define GPIO_PIN6                     (6  << GPIO_PIN_SHIFT)
+#define GPIO_PIN7                     (7  << GPIO_PIN_SHIFT)
+#define GPIO_PIN8                     (8  << GPIO_PIN_SHIFT)
+#define GPIO_PIN9                     (9  << GPIO_PIN_SHIFT)
+#define GPIO_PIN10                    (10 << GPIO_PIN_SHIFT)
+#define GPIO_PIN11                    (11 << GPIO_PIN_SHIFT)
+#define GPIO_PIN12                    (12 << GPIO_PIN_SHIFT)
+#define GPIO_PIN13                    (13 << GPIO_PIN_SHIFT)
+#define GPIO_PIN14                    (14 << GPIO_PIN_SHIFT)
+#define GPIO_PIN15                    (15 << GPIO_PIN_SHIFT)
+#define GPIO_PIN16                    (16 << GPIO_PIN_SHIFT)
+#define GPIO_PIN17                    (17 << GPIO_PIN_SHIFT)
+#define GPIO_PIN18                    (18 << GPIO_PIN_SHIFT)
+#define GPIO_PIN19                    (19 << GPIO_PIN_SHIFT)
+#define GPIO_PIN20                    (20 << GPIO_PIN_SHIFT)
+#define GPIO_PIN21                    (21 << GPIO_PIN_SHIFT)
+#define GPIO_PIN22                    (22 << GPIO_PIN_SHIFT)
+#define GPIO_PIN23                    (23 << GPIO_PIN_SHIFT)
+#define GPIO_PIN24                    (24 << GPIO_PIN_SHIFT)
+#define GPIO_PIN25                    (25 << GPIO_PIN_SHIFT)
+#define GPIO_PIN26                    (26 << GPIO_PIN_SHIFT)
+#define GPIO_PIN27                    (27 << GPIO_PIN_SHIFT)
+#define GPIO_PIN28                    (28 << GPIO_PIN_SHIFT)
+#define GPIO_PIN29                    (29 << GPIO_PIN_SHIFT)
+#define GPIO_PIN30                    (30 << GPIO_PIN_SHIFT)
+#define GPIO_PIN31                    (31 << GPIO_PIN_SHIFT)
 
 /************************************************************************************
  * Public Types
@@ -110,6 +193,50 @@ EXTERN void sam3u_clockconfig(void);
 
 EXTERN void sam3u_lowsetup(void);
 
+/************************************************************************************
+ * Name: sam3u_configgpio
+ *
+ * Description:
+ *   Configure a GPIO pin based on bit-encoded description of the pin.
+ *
+ ************************************************************************************/
+
+EXTERN int sam3u_configgpio(uint16_t cfgset);
+
+/************************************************************************************
+ * Name: sam3u_gpiowrite
+ *
+ * Description:
+ *   Write one or zero to the selected GPIO pin
+ *
+ ************************************************************************************/
+
+EXTERN void sam3u_gpiowrite(uint16_t pinset, bool value);
+
+/************************************************************************************
+ * Name: sam3u_gpioread
+ *
+ * Description:
+ *   Read one or zero from the selected GPIO pin
+ *
+ ************************************************************************************/
+
+EXTERN bool sam3u_gpioread(uint16_t pinset);
+
+/************************************************************************************
+ * Function:  sam3u_dumpgpio
+ *
+ * Description:
+ *   Dump all GPIO registers associated with the port of the provided pin description.
+ *
+ ************************************************************************************/
+
+#ifdef CONFIG_DEBUG
+EXTERN int sam3u_dumpgpio(uint16_t pinset, const char *msg);
+#else
+#  define sam3u_dumpgpio(p,m)
+#endif
+
 #undef EXTERN
 #if defined(__cplusplus)
 }

arch/arm/src/sam3u/sam3u_pio.h

@@ -112,7 +112,7 @@
 
 #define PIOA                         (0)
 #define PIOB                         (1)
-#define PIOB                         (2)
+#define PIOC                         (2)
 
 #define SAM3U_PIO_PER(n)             (SAM3U_PIO_BASE(n)+SAM3U_PIO_PER_OFFSET)
 #define SAM3U_PIO_PDR(n)             (SAM3U_PIO_BASE(n)+SAM3U_PIO_PDR_OFFSET)