cc3200: Use the pull up/down resistors on the antenna selection pins.

cc3200/misc/antenna.c

@@ -55,32 +55,24 @@ static antenna_type_t antenna_type_selected = ANTENNA_TYPE_INTERNAL;
 DEFINE PUBLIC FUNCTIONS
 ******************************************************************************/
 void antenna_init0(void) {
-
-    MAP_PRCMPeripheralClkEnable(PRCM_GPIOA3, PRCM_RUN_MODE_CLK);
+    // enable the peripheral clock and set the gpio direction for
+    // both antenna 1 and antenna 2 pins
+    MAP_PRCMPeripheralClkEnable(PRCM_GPIOA3, PRCM_RUN_MODE_CLK | PRCM_SLP_MODE_CLK);
     MAP_GPIODirModeSet(GPIOA3_BASE, 0x0C, GPIO_DIR_MODE_OUT);
 
-    // configure PIN_29 for GPIOOutput
-    HWREG(REG_PAD_CONFIG_26) = ((HWREG(REG_PAD_CONFIG_26) & ~(PAD_STRENGTH_MASK
-                                 | PAD_TYPE_MASK)) | (0x00000020 | 0x00000000 ));
-
+    // configure antenna 1 pin type and strength
+    HWREG(REG_PAD_CONFIG_26) = ((HWREG(REG_PAD_CONFIG_26) & ~(PAD_STRENGTH_MASK | PAD_TYPE_MASK)) | (0x00000020 | 0x00000000));
     // set the mode
-    HWREG(REG_PAD_CONFIG_26) = (((HWREG(REG_PAD_CONFIG_26) & ~PAD_MODE_MASK) |
-                                0x00000000) & ~(3 << 10));
-
+    HWREG(REG_PAD_CONFIG_26) = ((HWREG(REG_PAD_CONFIG_26) & ~PAD_MODE_MASK) | 0x00000000) & ~(3 << 10);
     // set the direction
     HWREG(REG_PAD_CONFIG_26) = ((HWREG(REG_PAD_CONFIG_26) & ~0xC00) | 0x00000800);
 
-
-    // configure PIN_30 for GPIOOutput
-    HWREG(REG_PAD_CONFIG_27) = ((HWREG(REG_PAD_CONFIG_27) & ~(PAD_STRENGTH_MASK
-                                | PAD_TYPE_MASK)) | (0x00000020 | 0x00000000 ));
-
+    // configure antenna 2 pin type and strength
+    HWREG(REG_PAD_CONFIG_27) = ((HWREG(REG_PAD_CONFIG_27) & ~(PAD_STRENGTH_MASK | PAD_TYPE_MASK)) | (0x00000020 | 0x00000000));
     // set the mode
-    HWREG(REG_PAD_CONFIG_27) = (((HWREG(REG_PAD_CONFIG_27) & ~PAD_MODE_MASK) |
-                                0x00000000) & ~(3 << 10));
-
+    HWREG(REG_PAD_CONFIG_27) = ((HWREG(REG_PAD_CONFIG_27) & ~PAD_MODE_MASK) | 0x00000000) & ~(3 << 10);
     // set the direction
-    HWREG(REG_PAD_CONFIG_26) = ((HWREG(REG_PAD_CONFIG_27) & ~0xC00) | 0x00000800);
+    HWREG(REG_PAD_CONFIG_27) = ((HWREG(REG_PAD_CONFIG_27) & ~0xC00) | 0x00000800);
 
     // select the currently active antenna
     antenna_select(antenna_type_selected);
@@ -89,8 +81,14 @@ void antenna_init0(void) {
 void antenna_select (antenna_type_t _antenna) {
     if (_antenna == ANTENNA_TYPE_INTERNAL) {
         MAP_GPIOPinWrite(GPIOA3_BASE, 0x0C, 0x04);
+        // also configure the pull-up and pull-down accordingly
+        HWREG(REG_PAD_CONFIG_26) = ((HWREG(REG_PAD_CONFIG_26) & ~PAD_TYPE_MASK)) | PIN_TYPE_STD_PU;
+        HWREG(REG_PAD_CONFIG_27) = ((HWREG(REG_PAD_CONFIG_27) & ~PAD_TYPE_MASK)) | PIN_TYPE_STD_PD;
     } else {
         MAP_GPIOPinWrite(GPIOA3_BASE, 0x0C, 0x08);
+        // also configure the pull-up and pull-down accordingly
+        HWREG(REG_PAD_CONFIG_26) = ((HWREG(REG_PAD_CONFIG_26) & ~PAD_TYPE_MASK)) | PIN_TYPE_STD_PD;
+        HWREG(REG_PAD_CONFIG_27) = ((HWREG(REG_PAD_CONFIG_27) & ~PAD_TYPE_MASK)) | PIN_TYPE_STD_PU;
     }
     antenna_type_selected = _antenna;
 }

cc3200/mods/pybsleep.c

@@ -499,9 +499,17 @@ STATIC void pybsleep_iopark (bool hibernate) {
     if (hibernate) {
 #endif
         // park the antenna selection pins
+        // (tri-stated with pull down enabled)
         HWREG(0x4402E108) = 0x00000E61;
         HWREG(0x4402E10C) = 0x00000E61;
 #if MICROPY_HW_ANTENNA_DIVERSITY
+    } else {
+        // park the antenna selection pins
+        // (tri-stated without changing the pull up/down resistors)
+        HWREG(0x4402E108) &= ~0x000000FF;
+        HWREG(0x4402E108) |=  0x00000C61;
+        HWREG(0x4402E10C) &= ~0x000000FF;
+        HWREG(0x4402E10C) |=  0x00000C61;
     }
 #endif
 }