用SAM-BA或JLINK跑ATSAM4E16的程序(21) USB HID 鼠标

这个程序是用开发板按键来仿真鼠标。

至于USB的全过程请看下参考资料。

USB HID 应用笔记 ，讲得十分简练。

Windows自动识别并自动安装驱动。这一点相当于免驱：





而这里用HID ASF库包括以下几个函数：


bool udi_hid_mouse_btnleft(bool b_state)


bool udi_hid_mouse_btnmiddle(bool b_state)

bool udi_hid_mouse_btnright(bool b_state)

bool udi_hid_mouse_moveScroll(int8_t pos)

bool udi_hid_mouse_moveX(int8_t pos_x)

bool udi_hid_mouse_moveY(int8_t pos_y)


这些都在ui.c中用上了：

复制

#include <asf.h>

#include "ui.h"



#define  MOUSE_MOVE_RANGE  3



/* Wakeup pin is push button 2 (BP3, fast wakeup 10) */

#define  WAKEUP_PMC_FSTT (PUSHBUTTON_2_WKUP_FSTT)

#define  WAKEUP_PIN      (GPIO_PUSH_BUTTON_2)

#define  WAKEUP_PIO      (PIN_PUSHBUTTON_2_PIO)

#define  WAKEUP_PIO_ID   (PIN_PUSHBUTTON_2_ID)

#define  WAKEUP_PIO_MASK (PIN_PUSHBUTTON_2_MASK)

#define  WAKEUP_PIO_ATTR \

        (PIO_INPUT | PIO_PULLUP | PIO_DEBOUNCE | PIO_IT_LOW_LEVEL)



/* Interrupt on "pin change" from push button to do wakeup on USB

 * Note:

 * This interrupt is enable when the USB host enable remotewakeup feature

 * This interrupt wakeup the CPU if this one is in idle mode

 */

static void ui_wakeup_handler(uint32_t id, uint32_t mask)

{

        if (WAKEUP_PIO_ID == id && WAKEUP_PIO_MASK == mask) {

                /* It is a wakeup then send wakeup USB */

                udc_remotewakeup();

                LED_On(LED0);

        }

}



void ui_init(void)

{

        /* Set handler for push button */

        pio_handler_set(WAKEUP_PIO, WAKEUP_PIO_ID, WAKEUP_PIO_MASK,

                WAKEUP_PIO_ATTR, ui_wakeup_handler);

        /* Enable IRQ for button (PIOA) */

        NVIC_EnableIRQ((IRQn_Type) WAKEUP_PIO_ID);

        /* Initialize LEDs */

        LED_Off(LED0);

        LED_Off(LED1);

}



void ui_powerdown(void)

{

        LED_Off(LED0);

        LED_Off(LED1);

}





void ui_wakeup_enable(void)

{

        /* Configure BP3 as PIO input */

        pio_configure_pin(WAKEUP_PIN, WAKEUP_PIO_ATTR);

        /* Enable interrupt for BP3 */

        pio_enable_pin_interrupt(WAKEUP_PIN);

        /* Enable fast wakeup for button pin (WKUP10 for PA20) */

        pmc_set_fast_startup_input(WAKEUP_PMC_FSTT);

}



void ui_wakeup_disable(void)

{

        /* Disable interrupt for button pin */

        pio_disable_pin_interrupt(WAKEUP_PIN);

        /* Disable fast wakeup for button pin (WKUP10 for BP3) */

        pmc_clr_fast_startup_input(WAKEUP_PMC_FSTT);

}



void ui_wakeup(void)

{

        LED_On(LED0);

}



void ui_process(uint16_t framenumber)

{

        static uint8_t cpt_sof = 0;

        static bool btn_left = false, btn_right = false;

        bool btn_pressed;



        if ((framenumber % 1000) == 0) {

                LED_On(LED1);

        }

        if ((framenumber % 1000) == 500) {

                LED_Off(LED1);

        }

        /* Scan process running each 2ms */

        cpt_sof++;

        if (cpt_sof < 2) {

                return;

        }

        cpt_sof = 0;



        /* Uses buttons to move mouse */

        if (!ioport_get_pin_level(GPIO_PUSH_BUTTON_3)) {

                udi_hid_mouse_moveY(-MOUSE_MOVE_RANGE);

        }

        if (!ioport_get_pin_level(GPIO_PUSH_BUTTON_4)) {

                udi_hid_mouse_moveY( MOUSE_MOVE_RANGE);

        }

        /* Check button click */

        btn_pressed = !ioport_get_pin_level(GPIO_PUSH_BUTTON_2);

        if (btn_pressed != btn_left) {

                btn_left = btn_pressed;

                udi_hid_mouse_btnleft(btn_left);

        }

        btn_pressed = !ioport_get_pin_level(GPIO_PUSH_BUTTON_1);

        if (btn_pressed != btn_right) {

                btn_right = btn_pressed;

                udi_hid_mouse_btnright(btn_right);

        }

}



/**

 * \defgroup UI User Interface

 *

 * Human interface on SAM4E-EK:

 * - Led 0 (D2) is on when USB is wakeup

 * - Led 1 (D3) blinks when USB host has checked and enabled HID Mouse interface

 * - Push button 2 (BP3) and push button 1 (BP2) are linked to mouse button

 *   left and right

 * - Push button 3 (BP4) and push button 4 (BP5) are used to move mouse up

 *   and down

 * - Only a low level on push button 2 (BP3) will generate a wakeup to USB Host

 *   in remote wakeup mode.

 *

 */

运行结果是：我的板子就四个键，其中一个键管上，按住后光标上移，其中一下向下。一个是左键，一个是右键，都很好用。