Merge pull request #11867 from mprse/cypress_gpio_fix

Fix for Cypress GPIO driver (fix for issue #11835)

Author: 0xc0170

targets/TARGET_Cypress/TARGET_PSOC6/cy_gpio_api.c

@@ -39,9 +39,9 @@ void apply_config(gpio_t *obj)
     }
 
     if (obj->drive_mode == PullUp) {
-        gpio_write(obj, 1);
+        gpio_set_pull(obj, 1);
     } else if (obj->drive_mode == PullDown) {
-        gpio_write(obj, 0);
+        gpio_set_pull(obj, 0);
     }
 }
 
@@ -80,6 +80,7 @@ void gpio_dir(gpio_t *obj, PinDirection direction)
     } else if (direction == PIN_OUTPUT) {
         // mbed reads from input buffer instead of DR even for output pins so always leave input buffer enabled
         obj->direction = CYHAL_GPIO_DIR_BIDIRECTIONAL;
+        gpio_write(obj, obj->output_val);
         if (obj->drive_mode == CYHAL_GPIO_DRIVE_NONE || obj->drive_mode == CYHAL_GPIO_DRIVE_ANALOG) {
             obj->drive_mode = CYHAL_GPIO_DRIVE_STRONG;
         }

targets/TARGET_Cypress/TARGET_PSOC6/gpio_object.h

@@ -35,6 +35,7 @@ typedef struct {
     cyhal_gpio_t pin;
     cyhal_gpio_direction_t direction;
     cyhal_gpio_drive_mode_t drive_mode;
+    int output_val;
 } gpio_t;
 
 struct gpio_irq_s {
@@ -57,6 +58,21 @@ struct port_s {
  * @param value The value to be set
  */
 static inline void gpio_write(gpio_t *obj, int value)
+{
+    if (obj->direction != CYHAL_GPIO_DIR_INPUT) {
+        MBED_ASSERT(obj->pin != CYHAL_NC_PIN_VALUE);
+        cyhal_gpio_write(obj->pin, value != 0);
+    } else {
+        obj->output_val = value;
+    }
+}
+
+/** Set the pull value
+ *
+ * @param obj   The GPIO object
+ * @param value The pull value to be set
+ */
+static inline void gpio_set_pull(gpio_t *obj, int value)
 {
     MBED_ASSERT(obj->pin != CYHAL_NC_PIN_VALUE);
     cyhal_gpio_write(obj->pin, value != 0);