Umar Naeem / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by Umar Naeem

targets/TARGET_Maxim/TARGET_MAX32630/mxc/gpio.c@165:2dd56e6daeec, 2017-05-23 (annotated)

Committer:
ranaumarnaeem
Date:
Tue May 23 12:54:50 2017 +0000
Revision:
165:2dd56e6daeec
Parent:
157:ff67d9f36b67 
jhjg

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 157:ff67d9f36b67 1 /**
<> 157:ff67d9f36b67 2 * @file
<> 157:ff67d9f36b67 3 * @brief This file contains the function implementations for the
<> 157:ff67d9f36b67 4 * General-Purpose Input/Output (GPIO) peripheral module.
<> 157:ff67d9f36b67 5 */
<> 157:ff67d9f36b67 6
<> 157:ff67d9f36b67 7 /* ****************************************************************************
<> 157:ff67d9f36b67 8 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
<> 157:ff67d9f36b67 9 *
<> 157:ff67d9f36b67 10 * Permission is hereby granted, free of charge, to any person obtaining a
<> 157:ff67d9f36b67 11 * copy of this software and associated documentation files (the "Software"),
<> 157:ff67d9f36b67 12 * to deal in the Software without restriction, including without limitation
<> 157:ff67d9f36b67 13 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
<> 157:ff67d9f36b67 14 * and/or sell copies of the Software, and to permit persons to whom the
<> 157:ff67d9f36b67 15 * Software is furnished to do so, subject to the following conditions:
<> 157:ff67d9f36b67 16 *
<> 157:ff67d9f36b67 17 * The above copyright notice and this permission notice shall be included
<> 157:ff67d9f36b67 18 * in all copies or substantial portions of the Software.
<> 157:ff67d9f36b67 19 *
<> 157:ff67d9f36b67 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
<> 157:ff67d9f36b67 21 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
<> 157:ff67d9f36b67 22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
<> 157:ff67d9f36b67 23 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
<> 157:ff67d9f36b67 24 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
<> 157:ff67d9f36b67 25 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
<> 157:ff67d9f36b67 26 * OTHER DEALINGS IN THE SOFTWARE.
<> 157:ff67d9f36b67 27 *
<> 157:ff67d9f36b67 28 * Except as contained in this notice, the name of Maxim Integrated
<> 157:ff67d9f36b67 29 * Products, Inc. shall not be used except as stated in the Maxim Integrated
<> 157:ff67d9f36b67 30 * Products, Inc. Branding Policy.
<> 157:ff67d9f36b67 31 *
<> 157:ff67d9f36b67 32 * The mere transfer of this software does not imply any licenses
<> 157:ff67d9f36b67 33 * of trade secrets, proprietary technology, copyrights, patents,
<> 157:ff67d9f36b67 34 * trademarks, maskwork rights, or any other form of intellectual
<> 157:ff67d9f36b67 35 * property whatsoever. Maxim Integrated Products, Inc. retains all
<> 157:ff67d9f36b67 36 * ownership rights.
<> 157:ff67d9f36b67 37 *
<> 157:ff67d9f36b67 38 * $Date: 2016-09-09 11:41:02 -0500 (Fri, 09 Sep 2016) $
<> 157:ff67d9f36b67 39 * $Revision: 24337 $
<> 157:ff67d9f36b67 40 *
<> 157:ff67d9f36b67 41 *************************************************************************** */
<> 157:ff67d9f36b67 42
<> 157:ff67d9f36b67 43 /* **** Includes **** */
<> 157:ff67d9f36b67 44 #include "mxc_config.h"
<> 157:ff67d9f36b67 45 #include "mxc_assert.h"
<> 157:ff67d9f36b67 46 #include "mxc_sys.h"
<> 157:ff67d9f36b67 47 #include "gpio.h"
<> 157:ff67d9f36b67 48 #include "clkman_regs.h"
<> 157:ff67d9f36b67 49
<> 157:ff67d9f36b67 50 /**
<> 157:ff67d9f36b67 51 * @ingroup gpio
<> 157:ff67d9f36b67 52 * @{
<> 157:ff67d9f36b67 53 */
<> 157:ff67d9f36b67 54
<> 157:ff67d9f36b67 55 /* **** Definitions **** */
<> 157:ff67d9f36b67 56
<> 157:ff67d9f36b67 57 /* **** Globals **** */
<> 157:ff67d9f36b67 58
<> 157:ff67d9f36b67 59 /* ************************************************************************* */
<> 157:ff67d9f36b67 60 static void (*callbacks[MXC_GPIO_NUM_PORTS][MXC_GPIO_MAX_PINS_PER_PORT])(void *);
<> 157:ff67d9f36b67 61 static void *cbparam[MXC_GPIO_NUM_PORTS][MXC_GPIO_MAX_PINS_PER_PORT];
<> 157:ff67d9f36b67 62
<> 157:ff67d9f36b67 63 /* **** Functions **** */
<> 157:ff67d9f36b67 64
<> 157:ff67d9f36b67 65 /* ************************************************************************* */
<> 157:ff67d9f36b67 66 static int PinConfig(unsigned int port, unsigned int pin, gpio_func_t func, gpio_pad_t pad)
<> 157:ff67d9f36b67 67 {
<> 157:ff67d9f36b67 68 /* Check if available */
<> 157:ff67d9f36b67 69 if (!(MXC_GPIO->free[port] & (1 << pin))) {
<> 157:ff67d9f36b67 70 return E_BUSY;
<> 157:ff67d9f36b67 71 }
<> 157:ff67d9f36b67 72
<> 157:ff67d9f36b67 73 /* Set function */
<> 157:ff67d9f36b67 74 uint32_t func_sel = MXC_GPIO->func_sel[port];
<> 157:ff67d9f36b67 75 func_sel &= ~(0xF << (4 * pin));
<> 157:ff67d9f36b67 76 func_sel |= (func << (4 * pin));
<> 157:ff67d9f36b67 77 MXC_GPIO->func_sel[port] = func_sel;
<> 157:ff67d9f36b67 78
<> 157:ff67d9f36b67 79 /* Normal input is always enabled */
<> 157:ff67d9f36b67 80 MXC_GPIO->in_mode[port] &= ~(0xF << (4 * pin));
<> 157:ff67d9f36b67 81
<> 157:ff67d9f36b67 82 /* Set requested output mode */
<> 157:ff67d9f36b67 83 uint32_t out_mode = MXC_GPIO->out_mode[port];
<> 157:ff67d9f36b67 84 out_mode &= ~(0xF << (4 * pin));
<> 157:ff67d9f36b67 85 out_mode |= (pad << (4 * pin));
<> 157:ff67d9f36b67 86 MXC_GPIO->out_mode[port] = out_mode;
<> 157:ff67d9f36b67 87
<> 157:ff67d9f36b67 88 /* Enable the pull up/down if necessary */
<> 157:ff67d9f36b67 89 if (pad == MXC_V_GPIO_OUT_MODE_HIGH_Z_WEAK_PULLUP) {
<> 157:ff67d9f36b67 90 MXC_GPIO->out_val[port] |= (1 << pin);
<> 157:ff67d9f36b67 91 } else if (pad == MXC_V_GPIO_OUT_MODE_HIGH_Z_WEAK_PULLDOWN) {
<> 157:ff67d9f36b67 92 MXC_GPIO->out_val[port] &= ~(1 << pin);
<> 157:ff67d9f36b67 93 }
<> 157:ff67d9f36b67 94
<> 157:ff67d9f36b67 95 return E_NO_ERROR;
<> 157:ff67d9f36b67 96 }
<> 157:ff67d9f36b67 97
<> 157:ff67d9f36b67 98 /* ************************************************************************* */
<> 157:ff67d9f36b67 99 int GPIO_Config(const gpio_cfg_t *cfg)
<> 157:ff67d9f36b67 100 {
<> 157:ff67d9f36b67 101 unsigned int pin;
<> 157:ff67d9f36b67 102 int err = E_NO_ERROR;
<> 157:ff67d9f36b67 103
<> 157:ff67d9f36b67 104 MXC_ASSERT(cfg);
<> 157:ff67d9f36b67 105 MXC_ASSERT(cfg->port < MXC_GPIO_NUM_PORTS);
<> 157:ff67d9f36b67 106
<> 157:ff67d9f36b67 107 // Set system level configurations
<> 157:ff67d9f36b67 108 if ((err = SYS_GPIO_Init()) != E_NO_ERROR) {
<> 157:ff67d9f36b67 109 return err;
<> 157:ff67d9f36b67 110 }
<> 157:ff67d9f36b67 111
<> 157:ff67d9f36b67 112 // Configure each pin in the mask
<> 157:ff67d9f36b67 113 for (pin = 0; pin < MXC_GPIO_MAX_PINS_PER_PORT; pin++) {
<> 157:ff67d9f36b67 114 if (cfg->mask & (1 << pin)) {
<> 157:ff67d9f36b67 115 if (PinConfig(cfg->port, pin, cfg->func, cfg->pad) != E_NO_ERROR) {
<> 157:ff67d9f36b67 116 err = E_BUSY;
<> 157:ff67d9f36b67 117 }
<> 157:ff67d9f36b67 118 }
<> 157:ff67d9f36b67 119 }
<> 157:ff67d9f36b67 120
<> 157:ff67d9f36b67 121 return err;
<> 157:ff67d9f36b67 122 }
<> 157:ff67d9f36b67 123
<> 157:ff67d9f36b67 124 /* ************************************************************************* */
<> 157:ff67d9f36b67 125 static void IntConfig(unsigned int port, unsigned int pin, gpio_int_mode_t mode)
<> 157:ff67d9f36b67 126 {
<> 157:ff67d9f36b67 127 uint32_t int_mode = MXC_GPIO->int_mode[port];
<> 157:ff67d9f36b67 128 int_mode &= ~(0xF << (pin*4));
<> 157:ff67d9f36b67 129 int_mode |= (mode << (pin*4));
<> 157:ff67d9f36b67 130 MXC_GPIO->int_mode[port] = int_mode;
<> 157:ff67d9f36b67 131 }
<> 157:ff67d9f36b67 132
<> 157:ff67d9f36b67 133 /* ************************************************************************* */
<> 157:ff67d9f36b67 134 void GPIO_IntConfig(const gpio_cfg_t *cfg, gpio_int_mode_t mode)
<> 157:ff67d9f36b67 135 {
<> 157:ff67d9f36b67 136 unsigned int pin;
<> 157:ff67d9f36b67 137
<> 157:ff67d9f36b67 138 MXC_ASSERT(cfg);
<> 157:ff67d9f36b67 139 MXC_ASSERT(cfg->port < MXC_GPIO_NUM_PORTS);
<> 157:ff67d9f36b67 140
<> 157:ff67d9f36b67 141 // Configure each pin in the mask
<> 157:ff67d9f36b67 142 for (pin = 0; pin < MXC_GPIO_MAX_PINS_PER_PORT; pin++) {
<> 157:ff67d9f36b67 143 if (cfg->mask & (1 << pin)) {
<> 157:ff67d9f36b67 144 IntConfig(cfg->port, pin, mode);
<> 157:ff67d9f36b67 145 }
<> 157:ff67d9f36b67 146 }
<> 157:ff67d9f36b67 147 }
<> 157:ff67d9f36b67 148
<> 157:ff67d9f36b67 149 /* ************************************************************************* */
<> 157:ff67d9f36b67 150 void GPIO_RegisterCallback(const gpio_cfg_t *cfg, gpio_callback_fn func, void *cbdata)
<> 157:ff67d9f36b67 151 {
<> 157:ff67d9f36b67 152 unsigned int pin;
<> 157:ff67d9f36b67 153
<> 157:ff67d9f36b67 154 MXC_ASSERT(cfg);
<> 157:ff67d9f36b67 155 MXC_ASSERT(cfg->port < MXC_GPIO_NUM_PORTS);
<> 157:ff67d9f36b67 156
<> 157:ff67d9f36b67 157 for (pin = 0; pin < MXC_GPIO_MAX_PINS_PER_PORT; pin++) {
<> 157:ff67d9f36b67 158 if (cfg->mask & (1 << pin)) {
<> 157:ff67d9f36b67 159 callbacks[cfg->port][pin] = func;
<> 157:ff67d9f36b67 160 cbparam[cfg->port][pin] = cbdata;
<> 157:ff67d9f36b67 161 }
<> 157:ff67d9f36b67 162 }
<> 157:ff67d9f36b67 163 }
<> 157:ff67d9f36b67 164
<> 157:ff67d9f36b67 165 /* ************************************************************************* */
<> 157:ff67d9f36b67 166 void GPIO_Handler(unsigned int port)
<> 157:ff67d9f36b67 167 {
<> 157:ff67d9f36b67 168 uint8_t intfl;
<> 157:ff67d9f36b67 169 unsigned int pin;
<> 157:ff67d9f36b67 170
<> 157:ff67d9f36b67 171 MXC_ASSERT(port < MXC_GPIO_NUM_PORTS);
<> 157:ff67d9f36b67 172
<> 157:ff67d9f36b67 173 // Read and clear enabled interrupts.
<> 157:ff67d9f36b67 174 intfl = MXC_GPIO->intfl[port];
<> 157:ff67d9f36b67 175 intfl &= MXC_GPIO->inten[port];
<> 157:ff67d9f36b67 176 MXC_GPIO->intfl[port] = intfl;
<> 157:ff67d9f36b67 177
<> 157:ff67d9f36b67 178 // Process each pins' interrupt
<> 157:ff67d9f36b67 179 for (pin = 0; pin < MXC_GPIO_MAX_PINS_PER_PORT; pin++) {
<> 157:ff67d9f36b67 180 if ((intfl & (1 << pin)) && callbacks[port][pin]) {
<> 157:ff67d9f36b67 181 callbacks[port][pin](cbparam[port][pin]);
<> 157:ff67d9f36b67 182 }
<> 157:ff67d9f36b67 183 }
<> 157:ff67d9f36b67 184 }
<> 157:ff67d9f36b67 185
<> 157:ff67d9f36b67 186 /**@} end of group gpio */