Diff: targets/TARGET_Maxim/TARGET_MAX32625/mxc/gpio.c

Revision:

150:02e0a0aed4ec

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_Maxim/TARGET_MAX32625/mxc/gpio.c	Tue Nov 08 17:45:16 2016 +0000
@@ -0,0 +1,186 @@
+/**
+ * @file gpio.c
+ * @brief      This file contains the function implementations for the
+ *             General-Purpose Input/Output (GPIO) peripheral module.
+ */
+
+/* ****************************************************************************
+ * 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.
+ *
+ * $Date: 2016-08-15 20:04:11 -0500 (Mon, 15 Aug 2016) $
+ * $Revision: 24085 $
+ *
+ *************************************************************************** */
+
+/* **** Includes **** */
+#include "mxc_config.h"
+#include "mxc_assert.h"
+#include "mxc_sys.h"
+#include "gpio.h"
+#include "clkman_regs.h"
+
+/**
+ * @ingroup gpio
+ * @{
+ */
+
+/* **** Definitions **** */
+
+/* **** Globals **** */
+
+/* ************************************************************************* */
+static void (*callbacks[MXC_GPIO_NUM_PORTS][MXC_GPIO_MAX_PINS_PER_PORT])(void *);
+static void *cbparam[MXC_GPIO_NUM_PORTS][MXC_GPIO_MAX_PINS_PER_PORT];
+
+/* **** Functions **** */
+
+/* ************************************************************************* */
+static int PinConfig(unsigned int port, unsigned int pin, gpio_func_t func, gpio_pad_t pad)
+{
+    /* Check if available */
+    if (!(MXC_GPIO->free[port] & (1 << pin))) {
+        return E_BUSY;
+    }
+
+    /* Set function */
+    uint32_t func_sel = MXC_GPIO->func_sel[port];
+    func_sel &= ~(0xF << (4 * pin));
+    func_sel |=  (func << (4 * pin));
+    MXC_GPIO->func_sel[port] = func_sel;
+
+    /* Normal input is always enabled */
+    MXC_GPIO->in_mode[port] &= ~(0xF << (4 * pin));
+
+    /* Set requested output mode */
+    uint32_t out_mode = MXC_GPIO->out_mode[port];
+    out_mode &= ~(0xF << (4 * pin));
+    out_mode |=  (pad << (4 * pin));
+    MXC_GPIO->out_mode[port] = out_mode;
+
+    /* Enable the pull up/down if necessary */
+    if (pad == MXC_V_GPIO_OUT_MODE_HIGH_Z_WEAK_PULLUP) {
+        MXC_GPIO->out_val[port] |= (1 << pin);
+    } else if (pad == MXC_V_GPIO_OUT_MODE_HIGH_Z_WEAK_PULLDOWN) {
+        MXC_GPIO->out_val[port] &= ~(1 << pin);
+    }
+
+    return E_NO_ERROR;
+}
+
+/* ************************************************************************* */
+int GPIO_Config(const gpio_cfg_t *cfg)
+{
+    unsigned int pin;
+    int err = E_NO_ERROR;
+
+    MXC_ASSERT(cfg);
+    MXC_ASSERT(cfg->port < MXC_GPIO_NUM_PORTS);
+
+    // Set system level configurations
+    if ((err = SYS_GPIO_Init()) != E_NO_ERROR) {
+        return err;
+    }
+
+    // Configure each pin in the mask
+    for (pin = 0; pin < MXC_GPIO_MAX_PINS_PER_PORT; pin++) {
+        if (cfg->mask & (1 << pin)) {
+            if (PinConfig(cfg->port, pin, cfg->func, cfg->pad) != E_NO_ERROR) {
+                err = E_BUSY;
+            }
+        }
+    }
+
+    return err;
+}
+
+/* ************************************************************************* */
+static void IntConfig(unsigned int port, unsigned int pin, gpio_int_mode_t mode)
+{
+    uint32_t int_mode = MXC_GPIO->int_mode[port];
+    int_mode &= ~(0xF << (pin*4));
+    int_mode |= (mode << (pin*4));
+    MXC_GPIO->int_mode[port] = int_mode;
+}
+
+/* ************************************************************************* */
+void GPIO_IntConfig(const gpio_cfg_t *cfg, gpio_int_mode_t mode)
+{
+    unsigned int pin;
+
+    MXC_ASSERT(cfg);
+    MXC_ASSERT(cfg->port < MXC_GPIO_NUM_PORTS);
+
+    // Configure each pin in the mask
+    for (pin = 0; pin < MXC_GPIO_MAX_PINS_PER_PORT; pin++) {
+        if (cfg->mask & (1 << pin)) {
+            IntConfig(cfg->port, pin, mode);
+        }
+    }
+}
+
+/* ************************************************************************* */
+void GPIO_RegisterCallback(const gpio_cfg_t *cfg, gpio_callback_fn func, void *cbdata)
+{
+    unsigned int pin;
+
+    MXC_ASSERT(cfg);
+    MXC_ASSERT(cfg->port < MXC_GPIO_NUM_PORTS);
+
+    for (pin = 0; pin < MXC_GPIO_MAX_PINS_PER_PORT; pin++) {
+        if (cfg->mask & (1 << pin)) {
+            callbacks[cfg->port][pin] = func;
+            cbparam[cfg->port][pin] = cbdata;
+        }
+    }
+}
+
+/* ************************************************************************* */
+void GPIO_Handler(unsigned int port)
+{
+    uint8_t intfl;
+    unsigned int pin;
+
+    MXC_ASSERT(port < MXC_GPIO_NUM_PORTS);
+
+    // Read and clear enabled interrupts.
+    intfl = MXC_GPIO->intfl[port];
+    intfl &= MXC_GPIO->inten[port];
+    MXC_GPIO->intfl[port] = intfl;
+
+    // Process each pins' interrupt
+    for (pin = 0; pin < MXC_GPIO_MAX_PINS_PER_PORT; pin++) {
+        if ((intfl & (1 << pin)) && callbacks[port][pin]) {
+            callbacks[port][pin](cbparam[port][pin]);
+        }
+    }
+}
+
+/**@} end of group gpio */