我正在尝试将STM32F0-disco用作Windows PC的键盘。 我遇到了正在打印的字符问题。
以下代码将等待板载按钮被按下,然后应该打印三个字符。
/* USER CODE BEGIN 2 */
USBDelay = USBD_HID_GetPollingInterval(&hUsbDeviceFS);
while (HAL_GPIO_ReadPin(B1_GPIO_Port, B1_Pin) == 0);
if (HAL_GPIO_ReadPin(B1_GPIO_Port, B1_Pin) == 1) {
HAL_GPIO_TogglePin(LD3_GPIO_Port, LD3_Pin);
buff[0] = 0x00;
buff[2] = 0x04;
buff[3] = 0x05;
buff[4] = 0x06;
USBD_HID_SendReport(&hUsbDeviceFS, buff, 8);
HAL_Delay(USBDelay);
buff[0] = 0x00;
buff[2] = 0x00;
buff[3] = 0x00;
buff[4] = 0x00;
USBD_HID_SendReport(&hUsbDeviceFS, buff, 8);
HAL_GPIO_TogglePin(LD4_GPIO_Port, LD4_Pin);
HAL_Delay(1000);
}
while (HAL_GPIO_ReadPin(B1_GPIO_Port, B1_Pin) == 1);
/* USER CODE END 2 */
我遇到的问题是,缓冲区中仅有前两个关键位置的字符(这将是数组中第三和第四个元素,因为第一个元素是修改器,第二个元素是保留字)。此外,字符不断连续打印而不停止。
根据我添加的LED进行测试,我想要打印的字符直到第二个USB_SendReport后才会打印出来,该命令应该发送空白字符以停止打印。
我已经对usbd_hid.c和usbd_hid.h进行了必要的更改,还有时钟配置和启用USB等。下面是我的键盘描述符。
0x05, 0x01, // USAGE_PAGE (Generic Desktop)
0x09, 0x06, // USAGE (Keyboard)
0xa1, 0x01, // COLLECTION (Application)
0x05, 0x07, // USAGE_PAGE (Keyboard)
0x19, 0xe0, // USAGE_MINIMUM (Keyboard LeftControl)
0x29, 0xe7, // USAGE_MAXIMUM (Keyboard Right GUI)
0x15, 0x00, // LOGICAL_MINIMUM (0)
0x25, 0x01, // LOGICAL_MAXIMUM (1)
0x75, 0x01, // REPORT_SIZE (1)
0x95, 0x08, // REPORT_COUNT (8)
0x81, 0x02, // INPUT (Data,Var,Abs)
0x95, 0x01, // REPORT_COUNT (1)
0x75, 0x08, // REPORT_SIZE (8)
0x81, 0x03, // INPUT (Cnst,Var,Abs)
0x95, 0x05, // REPORT_COUNT (5)
0x75, 0x01, // REPORT_SIZE (1)
0x05, 0x08, // USAGE_PAGE (LEDs)
0x19, 0x01, // USAGE_MINIMUM (Num Lock)
0x29, 0x05, // USAGE_MAXIMUM (Kana)
0x91, 0x02, // OUTPUT (Data,Var,Abs)
0x95, 0x01, // REPORT_COUNT (1)
0x75, 0x03, // REPORT_SIZE (3)
0x91, 0x03, // OUTPUT (Cnst,Var,Abs)
0x95, 0x06, // REPORT_COUNT (6)
0x75, 0x08, // REPORT_SIZE (8)
0x15, 0x00, // LOGICAL_MINIMUM (0)
0x25, 0x65, // LOGICAL_MAXIMUM (101)
0x05, 0x07, // USAGE_PAGE (Keyboard)
0x19, 0x00, // USAGE_MINIMUM (Reserved (no event indicated))
0x29, 0x65, // USAGE_MAXIMUM (Keyboard Application)
0x81, 0x00, // INPUT (Data,Ary,Abs)
0xc0 // END_COLLECTION
有什么想法吗?