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Initial Release
Basic GPIO functions
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‎OPi/__init__.py

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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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__author__ = 'Jeremie-C'

‎setup.py

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"""
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Copyright (c) 2012-2016 Ben Croston
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do
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so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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"""
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from distutils.core import setup, Extension
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classifiers = ['Development Status :: 3 - Alpha',
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'Operating System :: POSIX :: Linux',
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'License :: OSI Approved :: MIT License',
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'Intended Audience :: Developers',
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'Programming Language :: Python :: 2.6',
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'Programming Language :: Python :: 2.7',
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'Programming Language :: Python :: 3',
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'Topic :: Software Development',
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'Topic :: Home Automation',
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'Topic :: System :: Hardware']
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setup(name = 'OPi.GPIO',
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version = '0.6.3',
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author = 'Jeremie-C',
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description = 'A module to control OrangePi GPIO channels',
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license = 'MIT',
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keywords = 'OrangePi GPIO',
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url = 'https://github.com/Jeremie-C/OrangePi.GPIO',
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classifiers = classifiers,
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packages = ['OPi'],
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ext_modules = [Extension('OPi.GPIO', ['source/py_gpio.c', 'source/c_gpio.c', 'source/common.c', 'source/constants.c'])])

‎source/c_gpio.c

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/*
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Copyright (c) 2012-2015 Ben Croston
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
8+
of the Software, and to permit persons to whom the Software is furnished to do
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so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include "c_gpio.h"
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static volatile uint32_t *gpio_map;
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uint32_t readl(uint32_t addr)
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{
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uint32_t val = 0;
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uint32_t mmap_base = (addr & ~MAP_MASK);
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uint32_t mmap_seek = ((addr - mmap_base) >> 2);
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val = *(gpio_map + mmap_seek);
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if(OPiGPIODebug)
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printf("mmap_base = 0x%x\t mmap_seek = 0x%x\t gpio_map = 0x%x\t total = 0x%x\n",mmap_base,mmap_seek,gpio_map,(gpio_map + mmap_seek));
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return val;
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}
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void writel(uint32_t val, uint32_t addr)
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{
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uint32_t mmap_base = (addr & ~MAP_MASK);
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uint32_t mmap_seek = ((addr - mmap_base) >> 2);
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*(gpio_map + mmap_seek) = val;
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}
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int setup(void)
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{
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int mem_fd;
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uint8_t *gpio_mem;
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if ((mem_fd = open("/dev/mem", O_RDWR|O_SYNC) ) < 0)
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{
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return SETUP_DEVMEM_FAIL;
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}
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if ((gpio_mem = malloc(BLOCK_SIZE + (PAGE_SIZE-1))) == NULL)
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return SETUP_MALLOC_FAIL;
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if ((uint32_t)gpio_mem % PAGE_SIZE)
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gpio_mem += PAGE_SIZE - ((uint32_t)gpio_mem % PAGE_SIZE);
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gpio_map = (uint32_t *)mmap( (caddr_t)gpio_mem, BLOCK_SIZE, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FIXED, mem_fd, GPIO_BASE_OPI);
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if(OPiGPIODebug)
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printf("gpio_mem = 0x%x\t gpio_map = 0x%x\n",gpio_mem,gpio_map);
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if ((uint32_t)gpio_map < 0)
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return SETUP_MMAP_FAIL;
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return SETUP_OK;
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}
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int gpio_function(int gpio)
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{
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uint32_t regval = 0;
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int bank = gpio >> 5;
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int index = gpio - (bank << 5);
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int offset = ((index - ((index >> 3) << 3)) << 2);
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uint32_t phyaddr = SUNXI_GPIO_BASE + (bank * 36) + ((index >> 3) << 2);
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regval = readl(phyaddr);
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if (OPiGPIODebug)
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printf("read reg val: 0x%x offset:%d\n",regval,offset);
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regval >>= offset;
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regval &= 7;
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if (OPiGPIODebug)
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printf("read reg val: 0x%x\n",regval);
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return regval; // 1=input, 0=output, 4=alt0
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}
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void set_pullupdn(int gpio, int pud)//void sunxi_pullUpDnControl (int pin, int pud)
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{
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uint32_t regval = 0;
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int bank = gpio >> 5;
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int index = gpio - (bank << 5);
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int sub = index >> 4;
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int sub_index = index - 16*sub;
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uint32_t phyaddr = SUNXI_GPIO_BASE + (bank * 36) + 0x1C + 4*sub; // +0x1c -> pullUpDn reg
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if (OPiGPIODebug)
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printf("func:%s pin:%d,bank:%d index:%d sub:%d phyaddr:0x%x\n",__func__, gpio,bank,index,sub,phyaddr);
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regval = readl(phyaddr);
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if (OPiGPIODebug)
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printf("pullUpDn reg:0x%x, pud:0x%x sub_index:%d\n", regval, pud, sub_index);
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regval &= ~(3 << (sub_index << 1));
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regval |= (pud << (sub_index << 1));
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if (OPiGPIODebug)
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printf("pullUpDn val ready to set:0x%x\n", regval);
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writel(regval, phyaddr);
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regval = readl(phyaddr);
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if (OPiGPIODebug)
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printf("pullUpDn reg after set:0x%x addr:0x%x\n", regval, phyaddr);
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}
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void setup_gpio(int gpio, int direction, int pud)//void sunxi_set_gpio_mode(int pin,int mode)
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{
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uint32_t regval = 0;
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int bank = gpio >> 5;
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int index = gpio - (bank << 5);
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int offset = ((index - ((index >> 3) << 3)) << 2);
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uint32_t phyaddr = SUNXI_GPIO_BASE + (bank * 36) + ((index >> 3) << 2);
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if (OPiGPIODebug)
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printf("func:%s pin:%d, direction:%d bank:%d index:%d phyaddr:0x%x\n",__func__, gpio , direction,bank,index,phyaddr);
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regval = readl(phyaddr);
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if (OPiGPIODebug)
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printf("read reg val: 0x%x offset:%d\n",regval,offset);
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set_pullupdn(gpio, pud);
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if(INPUT == direction)
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{
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regval &= ~(7 << offset);
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writel(regval, phyaddr);
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regval = readl(phyaddr);
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if (OPiGPIODebug)
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printf("Input mode set over reg val: 0x%x\n",regval);
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}
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else if(OUTPUT == direction)
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{
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regval &= ~(7 << offset);
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regval |= (1 << offset);
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if (OPiGPIODebug)
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printf("Out mode ready set val: 0x%x\n",regval);
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writel(regval, phyaddr);
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regval = readl(phyaddr);
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if (OPiGPIODebug)
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printf("Out mode set over reg val: 0x%x\n",regval);
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}
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else
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{
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printf("line:%dpin number error\n",__LINE__);
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}
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}
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void output_gpio(int gpio, int value) //void sunxi_digitalWrite(int pin, int value)
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{
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uint32_t regval = 0;
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int bank = gpio >> 5;
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int index = gpio - (bank << 5);
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uint32_t phyaddr = SUNXI_GPIO_BASE + (bank * 36) + 0x10; // +0x10 -> data reg
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if (OPiGPIODebug)
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printf("func:%s pin:%d, value:%d bank:%d index:%d phyaddr:0x%x\n",__func__, gpio , value,bank,index,phyaddr);
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regval = readl(phyaddr);
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if (OPiGPIODebug)
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printf("before write reg val: 0x%x,index:%d\n",regval,index);
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if(0 == value)
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{
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regval &= ~(1 << index);
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writel(regval, phyaddr);
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regval = readl(phyaddr);
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if (OPiGPIODebug)
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printf("LOW val set over reg val: 0x%x\n",regval);
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}
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else
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{
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regval |= (1 << index);
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writel(regval, phyaddr);
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regval = readl(phyaddr);
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if (OPiGPIODebug)
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printf("HIGH val set over reg val: 0x%x\n",regval);
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}
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}
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int input_gpio(int gpio)//int sunxi_digitalRead(int pin)
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{
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uint32_t regval = 0;
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int bank = gpio >> 5;
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int index = gpio - (bank << 5);
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uint32_t phyaddr = SUNXI_GPIO_BASE + (bank * 36) + 0x10; // +0x10 -> data reg
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if (OPiGPIODebug)
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printf("func:%s pin:%d,bank:%d index:%d phyaddr:0x%x\n",__func__, gpio,bank,index,phyaddr);
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regval = readl(phyaddr);
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regval = regval >> index;
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regval &= 1;
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if (OPiGPIODebug)
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printf("***** read reg val: 0x%x,bank:%d,index:%d,line:%d\n",regval,bank,index,__LINE__);
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return regval;
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}
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void clear_event_detect(int gpio)
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{
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return;
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}
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int eventdetected(int gpio)
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{
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return 0;
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}
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void set_rising_event(int gpio, int enable)
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{
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return;
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}
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void set_falling_event(int gpio, int enable)
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{
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return;
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}
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void set_high_event(int gpio, int enable)
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{
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return;
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}
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void set_low_event(int gpio, int enable)
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{
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return;
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}
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void cleanup(void)
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{
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munmap((caddr_t)gpio_map, BLOCK_SIZE);
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}

‎source/c_gpio.h

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/*
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Copyright (c) 2012-2015 Ben Croston
3+
4+
Permission is hereby granted, free of charge, to any person obtaining a copy of
5+
this software and associated documentation files (the "Software"), to deal in
6+
the Software without restriction, including without limitation the rights to
7+
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
8+
of the Software, and to permit persons to whom the Software is furnished to do
9+
so, subject to the following conditions:
10+
11+
The above copyright notice and this permission notice shall be included in all
12+
copies or substantial portions of the Software.
13+
14+
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15+
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16+
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17+
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18+
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19+
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20+
SOFTWARE.
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*/
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#define GPIO_BASE_OPI (0x01C20000)
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#define SUNXI_GPIO_BASE (0x01C20800)
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#define PAGE_SIZE (4*1024)
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#define BLOCK_SIZE (4*1024)
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#define MAP_SIZE (4096*2)
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#define MAP_MASK (MAP_SIZE - 1)
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#define SETUP_OK 0
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#define SETUP_DEVMEM_FAIL 1
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#define SETUP_MALLOC_FAIL 2
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#define SETUP_MMAP_FAIL 3
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#define INPUT 1 // is really 0 for control register!
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#define OUTPUT 0 // is really 1 for control register!
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#define HIGH 1
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#define LOW 0
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#define PUD_OFF 0
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#define PUD_DOWN 2
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#define PUD_UP 1
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#define OPiGPIODebug 0
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int setup(void);
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int gpio_function(int gpio);
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void setup_gpio(int gpio, int direction, int pud);
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void output_gpio(int gpio, int value);
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int input_gpio(int gpio);
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void clear_event_detect(int gpio);
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int eventdetected(int gpio);
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void set_rising_event(int gpio, int enable);
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void set_falling_event(int gpio, int enable);
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void set_high_event(int gpio, int enable);
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void set_low_event(int gpio, int enable);
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void cleanup(void);

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