Merge pull request #70 from steveb/master

Add support for Raspberry Pi 4B

VERSION

@@ -1 +1 @@
-2.50
+2.60

gpio/readall.c

@@ -309,6 +309,8 @@ static void plus2header (int model)
     printf (" +-----+-----+---------+------+---+---Pi 3B+-+---+------+---------+-----+-----+\n") ;
   else if (model == PI_MODEL_3AP)
     printf (" +-----+-----+---------+------+---+---Pi 3A+-+---+------+---------+-----+-----+\n") ;
+  else if (model == PI_MODEL_4B)
+    printf (" +-----+-----+---------+------+---+---Pi 4B--+---+------+---------+-----+-----+\n") ;
   else
     printf (" +-----+-----+---------+------+---+---Pi ?---+---+------+---------+-----+-----+\n") ;
 }
@@ -356,6 +358,7 @@ void doReadall (void)
 	(model == PI_MODEL_2)    ||
 	(model == PI_MODEL_3AP)  ||
 	(model == PI_MODEL_3B)   || (model == PI_MODEL_3BP) ||
+	(model == PI_MODEL_4B)   ||
 	(model == PI_MODEL_ZERO) || (model == PI_MODEL_ZERO_W))
     piPlusReadall (model) ;
   else if ((model == PI_MODEL_CM) || (model == PI_MODEL_CM3) || ((model == PI_MODEL_CM3P)))

version.h

@@ -1,3 +1,3 @@
-#define VERSION "2.50"
+#define VERSION "2.60"
 #define VERSION_MAJOR 2
-#define VERSION_MINOR 50
+#define VERSION_MINOR 60

wiringPi/wiringPi.c

@@ -214,7 +214,8 @@ volatile unsigned int *_wiringPiTimerIrqRaw ;
 //	The base address of the GPIO memory mapped hardware IO
 
 #define	GPIO_PERI_BASE_OLD  0x20000000
-#define	GPIO_PERI_BASE_NEW	0x3F000000
+#define	GPIO_PERI_BASE_2835 0x3F000000
+#define	GPIO_PERI_BASE_2711 0xFE000000
 
 static volatile unsigned int piGpioBase = 0 ;
 
@@ -237,7 +238,7 @@ const char *piModelNames [20] =
   "Pi 3A+",	// 14
   "Unknown15",	// 15
   "CM3+",	// 16
-  "Unknown17",	// 17
+  "Pi 4B",	// 17
   "Unknown18",	// 18
   "Unknown19",	// 19
 } ;
@@ -542,6 +543,14 @@ static uint8_t gpioToFEN [] =
 
 #define	GPPUD	37
 
+/* 2711 has a different mechanism for pin pull-up/down/enable  */
+#define GPPUPPDN0                57        /* Pin pull-up/down for pins 15:0  */
+#define GPPUPPDN1                58        /* Pin pull-up/down for pins 31:16 */
+#define GPPUPPDN2                59        /* Pin pull-up/down for pins 47:32 */
+#define GPPUPPDN3                60        /* Pin pull-up/down for pins 57:48 */
+
+static volatile unsigned int piGpioPupOffset = 0 ;
+
 // gpioToPUDCLK
 //	(Word) offset to the Pull Up Down Clock regsiter
 
@@ -1508,12 +1517,37 @@ void pullUpDnControl (int pin, int pud)
     else if (wiringPiMode != WPI_MODE_GPIO)
       return ;
 
+    if (piGpioPupOffset == GPPUPPDN0)
+    {
+      // Pi 4B pull up/down method
+      int pullreg = GPPUPPDN0 + (pin>>4);
+      int pullshift = (pin & 0xf) << 1;
+      unsigned int pullbits;
+      unsigned int pull;
+
+      switch (pud)
+      {
+        case PUD_OFF: pull = 0; break;
+        case PUD_UP: pull = 1; break;
+        case PUD_DOWN: pull = 2; break;
+        default: return ; /* An illegal value */
+      }
+
+      pullbits = *(gpio + pullreg);
+      pullbits &= ~(3 << pullshift);
+      pullbits |= (pull << pullshift);
+      *(gpio + pullreg) = pullbits;
+    }
+    else
+    {
+      // legacy pull up/down method
       *(gpio + GPPUD)              = pud & 3 ;		delayMicroseconds (5) ;
       *(gpio + gpioToPUDCLK [pin]) = 1 << (pin & 31) ;	delayMicroseconds (5) ;
 
       *(gpio + GPPUD)              = 0 ;			delayMicroseconds (5) ;
       *(gpio + gpioToPUDCLK [pin]) = 0 ;			delayMicroseconds (5) ;
     }
+  }
   else						// Extension module
   {
     if ((node = wiringPiFindNode (pin)) != NULL)
@@ -1533,7 +1567,6 @@ int digitalRead (int pin)
 {
   char c ;
   struct wiringPiNodeStruct *node = wiringPiNodes ;
-
   if ((pin & PI_GPIO_MASK) == 0)		// On-Board Pin
   {
     /**/ if (wiringPiMode == WPI_MODE_GPIO_SYS)	// Sys mode
@@ -2243,7 +2276,9 @@ int wiringPiSetup (void)
 
   piBoardId (&model, &rev, &mem, &maker, &overVolted) ;
 
-  if ((model == PI_MODEL_CM) || (model == PI_MODEL_CM3) || (model == PI_MODEL_CM3P))
+  if ((model == PI_MODEL_CM) ||
+      (model == PI_MODEL_CM3) ||
+      (model == PI_MODEL_CM3P))
     wiringPiMode = WPI_MODE_GPIO ;
   else
     wiringPiMode = WPI_MODE_PINS ;
@@ -2268,10 +2303,17 @@ int wiringPiSetup (void)
     case PI_ALPHA:	case PI_MODEL_CM:
     case PI_MODEL_ZERO:	case PI_MODEL_ZERO_W:
       piGpioBase = GPIO_PERI_BASE_OLD ;
+      piGpioPupOffset = GPPUD ;
+      break ;
+
+    case PI_MODEL_4B:
+      piGpioBase = GPIO_PERI_BASE_2711 ;
+      piGpioPupOffset = GPPUPPDN0 ;
       break ;
 
     default:
-      piGpioBase = GPIO_PERI_BASE_NEW ;
+      piGpioBase = GPIO_PERI_BASE_2835 ;
+      piGpioPupOffset = GPPUD ;
       break ;
   }
 

wiringPi/wiringPi.h

@@ -102,6 +102,7 @@
 #define	PI_MODEL_3BP 		13
 #define	PI_MODEL_3AP 		14
 #define	PI_MODEL_CM3P 		16
+#define	PI_MODEL_4B 		17
 
 #define	PI_VERSION_1		0
 #define	PI_VERSION_1_1		1