m3dev

cortex m3 debug tools -- superceded by mdebug
git clone http://frotz.net/git/m3dev.git
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gpio.c (1215B)


      1 /* gpio.c
      2  *
      3  * Copyright 2014 Brian Swetland <swetland@frotz.net>
      4  * 
      5  * Licensed under the Apache License, Version 2.0 (the "License");
      6  * you may not use this file except in compliance with the License.
      7  * You may obtain a copy of the License at
      8  *
      9  *     http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  * Unless required by applicable law or agreed to in writing, software
     12  * distributed under the License is distributed on an "AS IS" BASIS,
     13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  * See the License for the specific language governing permissions and
     15  * limitations under the License.
     16  */
     17 
     18 #include <fw/io.h>
     19 #include <fw/lib.h>
     20 #include <arch/hardware.h>
     21 
     22 #define GPIO_OFF(n) ((n >> 5) << 2)
     23 #define GPIO_BIT(n) (1 << ((n) & 31))
     24 
     25 void gpio_cfg_dir(unsigned n, unsigned dir) {
     26 	u32 r = GPIO0_DIR + GPIO_OFF(n);
     27 	if (dir == GPIO_CFG_OUT) {
     28 		writel(readl(r) | GPIO_BIT(n), r);
     29 	} else {
     30 		writel(readl(r) & (~GPIO_BIT(n)), r);
     31 	}
     32 }
     33 
     34 void gpio_set(unsigned n) {
     35 	writeb(1, GPIO_BYTE(n));
     36 }
     37 
     38 void gpio_clr(unsigned n) {
     39 	writeb(0, GPIO_BYTE(n));
     40 }
     41 
     42 int gpio_rd(unsigned n) {
     43 	return readb(GPIO_BYTE(n));
     44 }
     45 
     46 void gpio_wr(unsigned n, unsigned v) {
     47 	writeb(!!v, GPIO_BYTE(n));
     48 }