Diff: targets/TARGET_Cypress/TARGET_PSOC6_FUTURE/port_api.c

Revision:

189:f392fc9709a3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_Cypress/TARGET_PSOC6_FUTURE/port_api.c	Wed Feb 20 22:31:08 2019 +0000
@@ -0,0 +1,117 @@
+/*
+ * mbed Microcontroller Library
+ * Copyright (c) 2017-2018 Future Electronics
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "cmsis.h"
+#include "device.h"
+#include "mbed_assert.h"
+#include "gpio_object.h"
+#include "port_api.h"
+#include "psoc6_utils.h"
+#include "mbed_error.h"
+
+static void port_init_pins(port_t *obj)
+{
+    uint32_t pin;
+    uint32_t cy_mode;
+
+    MBED_ASSERT(obj);
+    MBED_ASSERT(obj->port);
+
+    cy_mode = gpio_get_cy_drive_mode(obj->direction, obj->mode);
+    for (pin = 0; pin < 8; ++pin) {
+        if (obj->mask & (1 << pin)) {
+            Cy_GPIO_Pin_FastInit(obj->port, pin, cy_mode, 0, HSIOM_SEL_GPIO);
+        }
+    }
+
+    // Force output to enable pulls.
+    if (obj->direction == PIN_INPUT) {
+        switch (cy_mode) {
+            case CY_GPIO_DM_PULLUP:
+                port_write(obj, 0xff);
+                break;        // Force output to enable pulls.
+
+            case CY_GPIO_DM_PULLDOWN:
+                port_write(obj, 0);
+                break;
+        }
+    }
+}
+
+void port_init(port_t *obj, PortName port, int mask, PinDirection dir)
+{
+    uint32_t pin;
+
+    MBED_ASSERT(obj);
+
+    for (pin = 0; pin < 8; ++pin) {
+        if (mask & (1 << pin)) {
+            if (cy_reserve_io_pin((PinName)((port << 8)+pin))) {
+                error("Port pin reservation conflict.");
+            }
+        }
+    }
+    obj->port_id = port;
+    obj->port = Cy_GPIO_PortToAddr(port);
+    obj->mask = mask & 0xff; // Only 8 bits exist on a port in PSoC.
+    obj->direction = dir;
+    obj->mode = PullDefault;
+    port_init_pins(obj);
+}
+
+void port_mode(port_t *obj, PinMode mode)
+{
+    MBED_ASSERT(obj);
+    MBED_ASSERT(obj->port);
+
+    obj->mode = mode;
+    port_init_pins(obj);
+}
+
+void port_dir(port_t *obj, PinDirection dir)
+{
+    MBED_ASSERT(obj);
+    MBED_ASSERT(obj->port);
+
+    obj->direction = dir;
+    port_init_pins(obj);
+}
+
+void port_write(port_t *obj, int value)
+{
+    MBED_ASSERT(obj);
+    MBED_ASSERT(obj->port);
+
+    if (obj->mask == 0xff) {
+        obj->port->OUT = value;
+    } else {
+        // In case some bits are used for different functionality we need to write
+        // each bit separately to not break things out, eg. pull up state on other bits.
+        uint32_t pin;
+        for (pin = 0; pin < 8; ++pin) {
+            if (obj->mask & (1 << pin)) {
+                Cy_GPIO_Write(obj->port, pin, value & 0x1);
+                value >>= 1;
+            }
+        }
+    }
+}
+
+int port_read(port_t *obj)
+{
+    return obj->port->IN & obj->mask;
+}