Diff: targets/TARGET_Maxim/TARGET_MAX32625/gpio_api.c

Revision:

150:02e0a0aed4ec

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_Maxim/TARGET_MAX32625/gpio_api.c	Tue Nov 08 17:45:16 2016 +0000
@@ -0,0 +1,128 @@
+/*******************************************************************************
+ * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
+ * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Except as contained in this notice, the name of Maxim Integrated
+ * Products, Inc. shall not be used except as stated in the Maxim Integrated
+ * Products, Inc. Branding Policy.
+ *
+ * The mere transfer of this software does not imply any licenses
+ * of trade secrets, proprietary technology, copyrights, patents,
+ * trademarks, maskwork rights, or any other form of intellectual
+ * property whatsoever. Maxim Integrated Products, Inc. retains all
+ * ownership rights.
+ *******************************************************************************
+ */
+
+#include "mbed_assert.h"
+#include "gpio_api.h"
+#include "pinmap.h"
+#include "gpio_regs.h"
+#include "clkman_regs.h"
+
+uint32_t gpio_set(PinName name)
+{
+    MBED_ASSERT(name != (PinName)NC);
+    pin_function(name, 0);
+    return 1 << PINNAME_TO_PIN(name);
+}
+
+void gpio_init(gpio_t *obj, PinName name)
+{
+    obj->name = name;
+    if (name == (PinName)NC) {
+        return;
+    }
+
+    unsigned int port = PINNAME_TO_PORT(name);
+    unsigned int pin = PINNAME_TO_PIN(name);
+
+    obj->reg_out = (uint32_t*)BITBAND(&MXC_GPIO->out_val[port], pin);
+    obj->reg_in = (uint32_t*)BITBAND(&MXC_GPIO->in_val[port], pin);
+    obj->mode = PullDefault;
+
+    /* Ensure that the GPIO clock is enabled */
+    MXC_CLKMAN->clk_gate_ctrl1 |= MXC_F_CLKMAN_CLK_GATE_CTRL1_GPIO_CLK_GATER;
+
+    /* Ensure that the GPIO clock is enabled */
+    MXC_CLKMAN->sys_clk_ctrl_6_gpio = MXC_S_CLKMAN_CLK_SCALE_DIV_1;
+}
+
+void gpio_mode(gpio_t *obj, PinMode mode)
+{
+    obj->mode = mode;
+    pin_mode(obj->name, mode);
+}
+
+void pin_dir_mode(PinName name, PinDirection direction, PinMode mode)
+{
+    MBED_ASSERT(name != (PinName)NC);
+
+    unsigned int port = PINNAME_TO_PORT(name);
+    unsigned int pin = PINNAME_TO_PIN(name);
+
+    /* Set function; Firmware Control (GPIO mode) */
+    MXC_GPIO->func_sel[port] &= ~(0xF << (4 * pin));
+
+    /* Normal input is always enabled */
+    MXC_GPIO->in_mode[port] &= ~(0xF << (4 * pin));
+
+    uint32_t new_mode;
+    if (direction == PIN_OUTPUT) {
+        // PullUp      = not valid,
+        // PullDown    = not valid,
+        // OpenDrain   = MXC_V_GPIO_OUT_MODE_OD,
+        // PullNone    = MXC_V_GPIO_OUT_MODE_NORMAL,
+        if (mode == OpenDrain) {
+            new_mode = MXC_V_GPIO_OUT_MODE_OPEN_DRAIN;
+        } else {
+            new_mode = MXC_V_GPIO_OUT_MODE_NORMAL;
+        }
+    } else {
+        // PullUp      = MXC_V_GPIO_OUT_MODE_HIGH_Z_WEAK_PULLUP
+        // PullDown    = MXC_V_GPIO_OUT_MODE_HIGH_Z_WEAK_PULLDOWN
+        // OpenDrain   = MXC_V_GPIO_OUT_MODE_OD
+        // PullNone    = MXC_V_GPIO_OUT_MODE_NORMAL_HIGH_Z
+        if (mode == PullUp) {
+            new_mode = MXC_V_GPIO_OUT_MODE_HIGH_Z_WEAK_PULLUP;
+            MXC_GPIO->out_val[port] |= 1 << pin;
+        } else if (mode == PullDown) {
+            new_mode = MXC_V_GPIO_OUT_MODE_HIGH_Z_WEAK_PULLDOWN;
+            MXC_GPIO->out_val[port] &= ~(1 << pin);
+        } else if (mode == OpenDrain) {
+            new_mode = MXC_V_GPIO_OUT_MODE_OPEN_DRAIN;
+            MXC_GPIO->out_val[port] |= 1 << pin;
+        } else {
+            new_mode = MXC_V_GPIO_OUT_MODE_NORMAL_HIGH_Z;
+            MXC_GPIO->out_val[port] &= ~(1 << pin);
+        }
+    }
+
+    /* Set new mode */
+    uint32_t out_mode = MXC_GPIO->out_mode[port];
+    out_mode &= ~(0xF << (pin * 4));
+    out_mode |= (new_mode << (pin * 4));
+    MXC_GPIO->out_mode[port] = out_mode;
+}
+
+void gpio_dir(gpio_t *obj, PinDirection direction)
+{
+    pin_dir_mode(obj->name, direction, obj->mode);
+}