1 /*
2 * Copyright (c) 2015, Freescale Semiconductor, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without modification,
6 * are permitted provided that the following conditions are met:
7 *
8 * o Redistributions of source code must retain the above copyright notice, this list
9 * of conditions and the following disclaimer.
10 *
11 * o Redistributions in binary form must reproduce the above copyright notice, this
12 * list of conditions and the following disclaimer in the documentation and/or
13 * other materials provided with the distribution.
14 *
15 * o Neither the name of Freescale Semiconductor, Inc. nor the names of its
16 * contributors may be used to endorse or promote products derived from this
17 * software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
23 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
26 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "gpio_imx.h"
32
33 /*******************************************************************************
34 * Code
35 ******************************************************************************/
36
37 /*******************************************************************************
38 * GPIO Initialization and Configuration functions
39 ******************************************************************************/
40 /*FUNCTION**********************************************************************
41 *
42 * Function Name : GPIO_Init
43 * Description : Initializes the GPIO module according to the specified
44 * parameters in the initConfig.
45 *
46 *END**************************************************************************/
GPIO_Init(GPIO_Type * base,const gpio_init_config_t * initConfig)47 void GPIO_Init(GPIO_Type* base, const gpio_init_config_t* initConfig)
48 {
49 uint32_t pin;
50 volatile uint32_t *icr;
51
52 /* Register reset to default value */
53 GPIO_IMR_REG(base) = 0;
54 GPIO_EDGE_SEL_REG(base) = 0;
55
56 /* Get pin number */
57 pin = initConfig->pin;
58
59 /* Configure GPIO pin direction */
60 if (initConfig->direction == gpioDigitalOutput)
61 GPIO_GDIR_REG(base) |= (1U << pin);
62 else
63 GPIO_GDIR_REG(base) &= ~(1U << pin);
64
65 /* Configure GPIO pin interrupt mode */
66 if(pin < 16)
67 icr = &GPIO_ICR1_REG(base);
68 else
69 {
70 icr = &GPIO_ICR2_REG(base);
71 pin -= 16;
72 }
73 switch(initConfig->interruptMode)
74 {
75 case(gpioIntLowLevel):
76 {
77 *icr &= ~(0x3<<(2*pin));
78 break;
79 }
80 case(gpioIntHighLevel):
81 {
82 *icr = (*icr & (~(0x3<<(2*pin)))) | (0x1<<(2*pin));
83 break;
84 }
85 case(gpioIntRisingEdge):
86 {
87 *icr = (*icr & (~(0x3<<(2*pin)))) | (0x2<<(2*pin));
88 break;
89 }
90 case(gpioIntFallingEdge):
91 {
92 *icr |= (0x3<<(2*pin));
93 break;
94 }
95 case(gpioNoIntmode):
96 {
97 break;
98 }
99 }
100 }
101
102 /*******************************************************************************
103 * GPIO Read and Write Functions
104 ******************************************************************************/
105 /*FUNCTION**********************************************************************
106 *
107 * Function Name : GPIO_WritePinOutput
108 * Description : Sets the output level of the individual GPIO pin.
109 *
110 *END**************************************************************************/
GPIO_WritePinOutput(GPIO_Type * base,uint32_t pin,gpio_pin_action_t pinVal)111 void GPIO_WritePinOutput(GPIO_Type* base, uint32_t pin, gpio_pin_action_t pinVal)
112 {
113 assert(pin < 32);
114 if (pinVal == gpioPinSet)
115 {
116 GPIO_DR_REG(base) |= (1U << pin); /* Set pin output to high level.*/
117 }
118 else
119 {
120 GPIO_DR_REG(base) &= ~(1U << pin); /* Set pin output to low level.*/
121 }
122 }
123
124 /*******************************************************************************
125 * Interrupts and flags management functions
126 ******************************************************************************/
127 /*FUNCTION**********************************************************************
128 *
129 * Function Name : GPIO_SetPinIntMode
130 * Description : Enable or Disable the specific pin interrupt.
131 *
132 *END**************************************************************************/
GPIO_SetPinIntMode(GPIO_Type * base,uint32_t pin,bool enable)133 void GPIO_SetPinIntMode(GPIO_Type* base, uint32_t pin, bool enable)
134 {
135 assert(pin < 32);
136
137 if(enable)
138 GPIO_IMR_REG(base) |= (1U << pin);
139 else
140 GPIO_IMR_REG(base) &= ~(1U << pin);
141 }
142
143 /*FUNCTION**********************************************************************
144 *
145 * Function Name : GPIO_SetIntEdgeSelect
146 * Description : Enable or Disable the specific pin interrupt.
147 *
148 *END**************************************************************************/
149
GPIO_SetIntEdgeSelect(GPIO_Type * base,uint32_t pin,bool enable)150 void GPIO_SetIntEdgeSelect(GPIO_Type* base, uint32_t pin, bool enable)
151 {
152 assert(pin < 32);
153
154 if(enable)
155 GPIO_EDGE_SEL_REG(base) |= (1U << pin);
156 else
157 GPIO_EDGE_SEL_REG(base) &= ~(1U << pin);
158 }
159
160 /*******************************************************************************
161 * EOF
162 ******************************************************************************/
163
