網(wǎng)上有很多關(guān)于pos機驅(qū)動怎么安裝,通用嵌入式驅(qū)動層基本都是這么玩的的知識,也有很多人為大家解答關(guān)于pos機驅(qū)動怎么安裝的問題,今天pos機之家(www.tjfsxbj.com)為大家整理了關(guān)于這方面的知識,讓我們一起來看下吧!
本文目錄一覽:
pos機驅(qū)動怎么安裝
正文
一、前言以STM32為例,打開網(wǎng)絡(luò)上下載的例程或者是購買開發(fā)板自帶的例程,都會發(fā)現(xiàn)應(yīng)用層中會有stm32f10x.h或者stm32f10x_gpio.h,這些文件嚴(yán)格來時屬于硬件層的,如果軟件層出現(xiàn)這些文件會顯得很亂。
使用過Linux的童鞋們肯定知道linux系統(tǒng)無法直接操作硬件層,打開linux或者rt_thread代碼會發(fā)現(xiàn)代碼中都會有device的源文件,沒錯,這就是驅(qū)動層。
二、實現(xiàn)原理原理就是將硬件操作的接口全都放到驅(qū)動鏈表上,在驅(qū)動層實現(xiàn)device的open、read、write等操作。當(dāng)然這樣做也有弊端,就是驅(qū)動find的時候需要遍歷一遍驅(qū)動鏈表,這樣會增加代碼運行時間。
三、代碼實現(xiàn)國際慣例,寫代碼先寫頭文件。rt_thread中使用的是雙向鏈表,為了簡單在這我只用單向鏈表。有興趣的可以自行研究rt_thread
嵌入式物聯(lián)網(wǎng)需要學(xué)的東西真的非常多,千萬不要學(xué)錯了路線和內(nèi)容,導(dǎo)致工資要不上去!
無償分享大家一個資料包,差不多150多G。里面學(xué)習(xí)內(nèi)容、面經(jīng)、項目都比較新也比較全!某魚上買估計至少要好幾十。
點擊這里找小助理0元領(lǐng)?。狐c擊文中藍色字體領(lǐng)取吖
頭文件接口:
本次只實現(xiàn)如下接口,device_open 和device_close等剩下的接口可以自行研究。這樣就可以在應(yīng)用層中只調(diào)用如下接口可實現(xiàn):
/* 驅(qū)動注冊*/int cola_device_register(cola_device_t *dev);/* 驅(qū)動查找*/cola_device_t *cola_device_find(const char *name);/* 驅(qū)動讀*/int cola_device_read(cola_device_t *dev, int pos, void *buffer, int size);/* 驅(qū)動寫*/int cola_device_write(cola_device_t *dev, int pos, const void *buffer, int size);/* 驅(qū)動控制*/int cola_device_ctrl(cola_device_t *dev, int cmd, void *arg);;
頭文件cola_device.h:
#ifndef _COLA_DEVICE_H_#define _COLA_DEVICE_H_ enum LED_state{ LED_OFF, LED_ON, LED_TOGGLE, }; typedef struct cola_device cola_device_t; struct cola_device_ops{ int (*init) (cola_device_t *dev); int (*open) (cola_device_t *dev, int oflag); int (*close) (cola_device_t *dev); int (*read) (cola_device_t *dev, int pos, void *buffer, int size); int (*write) (cola_device_t *dev, int pos, const void *buffer, int size); int (*control)(cola_device_t *dev, int cmd, void *args); }; struct cola_device{ const char * name; struct cola_device_ops *dops; struct cola_device *next;}; /* 驅(qū)動注冊*/int cola_device_register(cola_device_t *dev);/* 驅(qū)動查找*/cola_device_t *cola_device_find(const char *name);/* 驅(qū)動讀*/int cola_device_read(cola_device_t *dev, int pos, void *buffer, int size);/* 驅(qū)動寫*/int cola_device_write(cola_device_t *dev, int pos, const void *buffer, int size);/* 驅(qū)動控制*/int cola_device_ctrl(cola_device_t *dev, int cmd, void *arg); #endif
源文件cola_device.c:
#include "cola_device.h"#include <string.h>#include <stdbool.h> struct cola_device *device_list = NULL; /* 查找任務(wù)是否存在*/static bool cola_device_is_exists( cola_device_t *dev ){ cola_device_t* cur = device_list; while( cur != NULL ) { if( strcmp(cur->name,dev->name)==0) { return true; } cur = cur->next; } return false;} static int device_list_inster(cola_device_t *dev){ cola_device_t *cur = device_list; if(NULL == device_list) { device_list = dev; dev->next = NULL; } else { while(NULL != cur->next) { cur = cur->next; } cur->next = dev; dev->next = NULL; } return 1;} /* 驅(qū)動注冊*/int cola_device_register(cola_device_t *dev){ if((NULL == dev) || (cola_device_is_exists(dev))) { return 0; } if((NULL == dev->name) || (NULL == dev->dops)) { return 0; } return device_list_inster(dev); }/* 驅(qū)動查找*/cola_device_t *cola_device_find(const char *name){ cola_device_t* cur = device_list; while( cur != NULL ) { if( strcmp(cur->name,name)==0) { return cur; } cur = cur->next; } return NULL;}/* 驅(qū)動讀*/int cola_device_read(cola_device_t *dev, int pos, void *buffer, int size){ if(dev) { if(dev->dops->read) { return dev->dops->read(dev, pos, buffer, size); } } return 0;}/* 驅(qū)動寫*/int cola_device_write(cola_device_t *dev, int pos, const void *buffer, int size){ if(dev) { if(dev->dops->write) { return dev->dops->write(dev, pos, buffer, size); } } return 0;}/* 驅(qū)動控制*/int cola_device_ctrl(cola_device_t *dev, int cmd, void *arg){ if(dev) { if(dev->dops->control) { return dev->dops->control(dev, cmd, arg); } } return 0;}
硬件注冊方式:以LED為例,初始化接口void led_register(void),需要在初始化中調(diào)用。
#include "stm32f0xx.h"#include "led.h"#include "cola_device.h" #define PORT_GREEN_LED GPIOC #define PIN_GREENLED GPIO_Pin_13 /* LED亮、滅、變化 */#define LED_GREEN_OFF (PORT_GREEN_LED->BSRR = PIN_GREENLED)#define LED_GREEN_ON (PORT_GREEN_LED->BRR = PIN_GREENLED)#define LED_GREEN_TOGGLE (PORT_GREEN_LED->ODR ^= PIN_GREENLED) static cola_device_t led_dev; static void led_gpio_init(void){ GPIO_InitTypeDef GPIO_InitStructure; RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE); GPIO_InitStructure.GPIO_Pin = PIN_GREENLED; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(PORT_GREEN_LED, &GPIO_InitStructure); LED_GREEN_OFF;} static int led_ctrl(cola_device_t *dev, int cmd, void *args){ if(LED_TOGGLE == cmd) { LED_GREEN_TOGGLE; } else { } return 1;} static struct cola_device_ops ops ={ .control = led_ctrl,}; void led_register(void){ led_gpio_init(); led_dev.dops = &ops; led_dev.name = "led"; cola_device_register(&led_dev);}
應(yīng)用層app代碼:
#include <string.h>#include "app.h"#include "config.h"#include "cola_device.h"#include "cola_os.h" static task_t timer_500ms;static cola_device_t *app_led_dev; //led每500ms狀態(tài)改變一次static void timer_500ms_cb(uint32_t event){ cola_device_ctrl(app_led_dev,LED_TOGGLE,0);} void app_init(void){ app_led_dev = cola_device_find("led"); assert(app_led_dev); cola_timer_create(&timer_500ms,timer_500ms_cb); cola_timer_start(&timer_500ms,TIMER_ALWAYS,500);}
這樣app.c文件中就不需要調(diào)用led.h頭文件了,rtt就是這樣實現(xiàn)的。
四、總結(jié)這樣就可以實現(xiàn)軟硬件分層了,是不是非常好用!
五、代碼下載鏈接https://gitee.com/schuck/cola_os
原文轉(zhuǎn)載于:https://blog.csdn.net/ziqi5543/article/details/101512722
轉(zhuǎn)載自:最后一個bug
文章來源:通用嵌入式驅(qū)動層基本都是這么玩的~
文章鏈接:https://mp.weixin.qq.com/s/5BY8KzS3qPalJhgZuT4R9w
版權(quán)申明:本文來源于網(wǎng)絡(luò),免費傳達知識,版權(quán)歸原作者所有。如涉及作品版權(quán)問題,請聯(lián)系我進行刪除。
以上就是關(guān)于pos機驅(qū)動怎么安裝,通用嵌入式驅(qū)動層基本都是這么玩的的知識,后面我們會繼續(xù)為大家整理關(guān)于pos機驅(qū)動怎么安裝的知識,希望能夠幫助到大家!
