tool/mbed/mbed-sdk/libraries/mbed/targets/hal/TARGET_Maxim/TARGET_MAX32600/pinmap.c

   1 /*******************************************************************************
   2  * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
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  11  * The above copyright notice and this permission notice shall be included
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  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  15  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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  22  * Except as contained in this notice, the name of Maxim Integrated
  23  * Products, Inc. shall not be used except as stated in the Maxim Integrated
  24  * Products, Inc. Branding Policy.
  25  *
  26  * The mere transfer of this software does not imply any licenses
  27  * of trade secrets, proprietary technology, copyrights, patents,
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  32  */
  33
  34 #include "mbed_assert.h"
  35 #include "pinmap.h"
  36 #include "objects.h"
  37 #include "gpio_regs.h"
  38 #include "ioman_regs.h"
  39
  40 void pin_function(PinName name, int function)
  41 {
  42     MBED_ASSERT(name != (PinName)NC);
  43
  44     if ((function >= 0) && (function <= 0xF)) {
  45         unsigned int port = PINNAME_TO_PORT(name);
  46         unsigned int pin = PINNAME_TO_PIN(name);
  47         uint32_t temp = MXC_GPIO->func_sel[port] & ~(0xF << (pin*4));
  48         MXC_GPIO->func_sel[port] = temp | ((uint32_t)function << (pin*4));
  49     } else {
  50         /* Assume this is a pointer to a pin function object */
  51         pin_function_t *obj = (pin_function_t*)function;
  52
  53         if ((*obj->reg_ack & obj->ack_mask) != obj->req_val) {
  54             /* Request pin mapping */
  55             *obj->reg_req |= obj->req_val;
  56
  57             /* Check for acknowledgment */
  58             MBED_ASSERT((*obj->reg_ack & obj->ack_mask) == obj->req_val);
  59         }
  60     }
  61 }
  62
  63 void pin_mode(PinName name, PinMode mode)
  64 {
  65     MBED_ASSERT(name != (PinName)NC);
  66     unsigned int port = PINNAME_TO_PORT(name);
  67     unsigned int pin = PINNAME_TO_PIN(name);
  68
  69     /* Must set mode while retaining direction */
  70
  71     /* Get the current direction */
  72     uint32_t out_mode = MXC_GPIO->out_mode[port];
  73     uint32_t curr_mode = (out_mode >> (pin*4)) & 0xF;
  74     PinDirection dir = PIN_OUTPUT;
  75     if ((curr_mode == MXC_V_GPIO_OUT_MODE_HIGH_Z_WEAK_PULLUP) || (curr_mode == MXC_V_GPIO_OUT_MODE_HIGH_Z)) {
  76         dir = PIN_INPUT;
  77     }
  78
  79     /* Set mode based on current direction */
  80     uint32_t new_mode;
  81     if (dir == PIN_OUTPUT) {
  82         // PullUp      = not valid,
  83         // OpenDrain   = MXC_V_GPIO_OUT_MODE_OD,
  84         // PullNone    = MXC_V_GPIO_OUT_MODE_NORMAL,
  85         if (mode == OpenDrain) {
  86             new_mode = MXC_V_GPIO_OUT_MODE_OPEN_DRAIN;
  87         } else {
  88             new_mode = MXC_V_GPIO_OUT_MODE_NORMAL_DRIVE;
  89         }
  90     } else {
  91         // PullUp      = MXC_V_GPIO_OUT_MODE_HIZPU,
  92         // OpenDrain   = not valid,
  93         // PullNone    = MXC_V_GPIO_OUT_MODE_HIZ,
  94         if (mode == PullUp) {
  95             new_mode = MXC_V_GPIO_OUT_MODE_HIGH_Z_WEAK_PULLUP;
  96         } else {
  97             new_mode = MXC_V_GPIO_OUT_MODE_HIGH_Z;
  98         }
  99     }
 100
 101     /* Set new mode */
 102     out_mode &= ~(0xF << (pin*4));
 103     out_mode |= (new_mode << (pin*4));
 104     MXC_GPIO->out_mode[port] = out_mode;
 105 }