m3dev

cortex m3 debug tools -- superceded by mdebug
git clone http://frotz.net/git/m3dev.git
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gpio.c (1315B)


      1 /* gpio.c
      2  *
      3  * Copyright 2011 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/types.h>
     19 #include <fw/lib.h>
     20 #include <fw/io.h>
     21 
     22 #include <arch/hardware.h>
     23 
     24 static unsigned gpio_cr[4] = {
     25 	GPIOA_BASE + GPIO_CRL,
     26 	GPIOA_BASE + GPIO_CRH,
     27 	GPIOB_BASE + GPIO_CRL,
     28 	GPIOB_BASE + GPIO_CRH,
     29 };
     30 
     31 void gpio_config(unsigned n, unsigned cfg)
     32 {
     33 	unsigned addr = gpio_cr[n >> 3];
     34 	unsigned shift = (n & 7) * 4;
     35 	unsigned val = readl(addr);
     36 	val = (val & (~(0xF << shift))) | (cfg << shift);
     37 	writel(val, addr);
     38 }
     39 
     40 void gpio_set(unsigned n)
     41 {
     42 	unsigned addr = (n > 15) ? GPIOB_BASE : GPIOA_BASE;
     43 	writel(1 << (n & 15), addr + GPIO_BSR);
     44 }
     45 
     46 void gpio_clr(unsigned n)
     47 {
     48 	unsigned addr = (n > 15) ? GPIOB_BASE : GPIOA_BASE;
     49 	writel(1 << (n & 15), addr + GPIO_BRR);
     50 }
     51