mirror of https://github.com/ARMmbed/mbed-os.git
118 lines
4.6 KiB
C
118 lines
4.6 KiB
C
/*******************************************************************************
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* Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name of Maxim Integrated
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* Products, Inc. shall not be used except as stated in the Maxim Integrated
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* Products, Inc. Branding Policy.
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*
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* The mere transfer of this software does not imply any licenses
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* of trade secrets, proprietary technology, copyrights, patents,
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* trademarks, maskwork rights, or any other form of intellectual
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* property whatsoever. Maxim Integrated Products, Inc. retains all
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* ownership rights.
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*******************************************************************************
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*/
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#include "mbed_assert.h"
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#include "pinmap.h"
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#include "objects.h"
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#include "gpio_regs.h"
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#include "ioman_regs.h"
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void pin_function(PinName name, int function)
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{
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MBED_ASSERT(name != (PinName)NC);
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if ((function >= 0) && (function <= 0xF)) {
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unsigned int port = PINNAME_TO_PORT(name);
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unsigned int pin = PINNAME_TO_PIN(name);
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uint32_t temp = MXC_GPIO->func_sel[port] & ~(0xF << (pin*4));
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MXC_GPIO->func_sel[port] = temp | ((uint32_t)function << (pin*4));
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} else {
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/* Assume this is a pointer to a pin function object */
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pin_function_t *obj = (pin_function_t*)function;
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if ((*obj->reg_ack & obj->ack_mask) != obj->req_val) {
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/* Request pin mapping */
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*obj->reg_req |= obj->req_val;
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/* Check for acknowledgment */
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MBED_ASSERT((*obj->reg_ack & obj->ack_mask) == obj->req_val);
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}
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}
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}
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void pin_mode(PinName name, PinMode mode)
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{
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MBED_ASSERT(name != (PinName)NC);
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unsigned int port = PINNAME_TO_PORT(name);
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unsigned int pin = PINNAME_TO_PIN(name);
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/* Must set mode while retaining direction */
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/* Get the current direction */
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uint32_t out_mode = MXC_GPIO->out_mode[port];
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uint32_t curr_mode = (out_mode >> (pin * 4)) & 0xF;
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PinDirection dir = PIN_OUTPUT;
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if ((curr_mode == MXC_V_GPIO_OUT_MODE_HIGH_Z_WEAK_PULLUP) ||
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(curr_mode == MXC_V_GPIO_OUT_MODE_HIGH_Z_WEAK_PULLDOWN) ||
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(curr_mode == MXC_V_GPIO_OUT_MODE_NORMAL_HIGH_Z)) {
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dir = PIN_INPUT;
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}
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/* Set mode based on current direction */
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uint32_t new_mode;
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if (dir == PIN_OUTPUT) {
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// PullUp = not valid,
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// PullDown = not valid,
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// OpenDrain = MXC_V_GPIO_OUT_MODE_OD,
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// PullNone = MXC_V_GPIO_OUT_MODE_NORMAL,
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if (mode == OpenDrain) {
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new_mode = MXC_V_GPIO_OUT_MODE_OPEN_DRAIN;
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} else {
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new_mode = MXC_V_GPIO_OUT_MODE_NORMAL;
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}
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} else {
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// PullUp = MXC_V_GPIO_OUT_MODE_HIGH_Z_WEAK_PULLUP
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// PullDown = MXC_V_GPIO_OUT_MODE_HIGH_Z_WEAK_PULLDOWN
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// OpenDrain = MXC_V_GPIO_OUT_MODE_OD
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// PullNone = MXC_V_GPIO_OUT_MODE_NORMAL_HIGH_Z
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if (mode == PullUp) {
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new_mode = MXC_V_GPIO_OUT_MODE_HIGH_Z_WEAK_PULLUP;
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MXC_GPIO->out_val[port] |= 1 << pin;
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} else if (mode == PullDown) {
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new_mode = MXC_V_GPIO_OUT_MODE_HIGH_Z_WEAK_PULLDOWN;
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MXC_GPIO->out_val[port] &= ~(1 << pin);
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} else if (mode == OpenDrain) {
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new_mode = MXC_V_GPIO_OUT_MODE_OPEN_DRAIN;
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MXC_GPIO->out_val[port] |= 1 << pin;
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} else {
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new_mode = MXC_V_GPIO_OUT_MODE_NORMAL_HIGH_Z;
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MXC_GPIO->out_val[port] &= ~(1 << pin);
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}
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}
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/* Set new mode */
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out_mode &= ~(0xF << (pin * 4));
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out_mode |= (new_mode << (pin * 4));
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MXC_GPIO->out_mode[port] = out_mode;
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}
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