【ST多款开发板返场测评】STM32F767 Nucleo-144 HID设备枚举过程调试
<div class='showpostmsg'><h1><b>前言</b></h1><p >前面我们准备了打印输出部分的实现,现在开始就可以基于此进行USB的调试了。</p>
<p > </p>
<h1 ><b>过程</b></h1>
<p >添加USB相关代码到现有的代码上</p>
<p >USB相关代码，PCD的驱动</p>
<p > </p>
<p > </p>
<p > </p>
<p >Stm32fxx_it.c中usb中断处理</p>
<pre>
<code class="language-cpp">void OTG_FS_IRQHandler(void)
{
HAL_PCD_IRQHandler(&hpcd);
}
/**
* @brief This function handles USB Handler.
* @param None
* @retval None
*/
void OTG_FS_WKUP_IRQHandler(void)
{
if((&hpcd)->Init.low_power_enable)
{
/* Reset SLEEPDEEP bit of Cortex System Control Register */
SCB->SCR &= (uint32_t)~((uint32_t)(SCB_SCR_SLEEPDEEP_Msk | SCB_SCR_SLEEPONEXIT_Msk));
SystemClockConfig_STOP();
/* Ungate PHY clock */
__HAL_PCD_UNGATE_PHYCLOCK((&hpcd));
}
/* Clear EXTI pending Bit*/
__HAL_USB_OTG_FS_WAKEUP_EXTI_CLEAR_FLAG();
}</code></pre>
<div style="page-break-after:always"><span style="display: none;"> </span></div>
<p> </p>
<p >Inc\stm32f7xx_hal_conf.h中</p>
<p >定义#define HAL_PCD_MODULE_ENABLED使用PCD库代码</p>
<p > </p>
<p >Main函数初始化</p>
<pre>
<code class="language-cpp">int main(void)
{
/* Configure the MPU attributes */
MPU_Config();
/* Enable the CPU Cache */
CPU_CACHE_Enable();
/* STM32F7xx HAL library initialization:
- Configure the Flash prefetch, instruction and Data caches
- Configure the Systick to generate an interrupt each 1 msec
- Set NVIC Group Priority to 4
- Global MSP (MCU Support Package) initialization
*/
HAL_Init();
/* Configure the system clock to 216 MHz */
SystemClock_Config();
/* Init Device Library */
USBD_Init(&USBD_Device, &HID_Desc, 0);
/* Add Supported Class */
USBD_RegisterClass(&USBD_Device, USBD_HID_CLASS);
/* Start Device Process */
USBD_Start(&USBD_Device);
bsp_uart_init();
uint8_t tx_buffer={0xAA,0x55};
static uint32_t pretick;
/* Infinite loop */
pretick = HAL_GetTick();
debug_set_level(DEBUG_TAG_SETUP, DEBUG_LEVEL_INFO);
while (1)
{
uart_debug_send(16);
shell_exec_shellcmd();
}
}</code></pre>
<h1 ><b>测试</b></h1>
<p >Main中使能打印输出</p>
<p >debug_set_level(DEBUG_TAG_SETUP, DEBUG_LEVEL_INFO);</p>
<p > </p>
<div style="page-break-after:always"><span style="display: none;"> </span></div>
<p> </p>
<p > </p>
<p >usbd_core.c中USBD_LL_SetupStage中添加如下日志输出，打印8字节的SETUP内容</p>
<p >do_debug(DEBUG_TAG_SETUP,DEBUG_LEVEL_INFO,":%#x %#x %#02x %#02x %#02x\r\n",pdev->request.bmRequest,</p>
<p >pdev->request.bRequest,pdev->request.wValue,pdev->request.wIndex,pdev->request.wLength);</p>
<p > </p>
<p >看到整个枚举过程打印如下</p>
<p >比如第一条0x80 0x06 0x100 00 0x40即获取设备描述符</p>
<p >第二条0 0x5 0x4 00 00即设置地址</p>
<p >可以清晰的看出整个枚举过程</p>
<p > </p>
<h1 ><b>总结</b></h1>
<p >磨刀不误砍柴工，工欲善其事必先利其器，有了前面的准备工作，准备了好用的命令行交互和打印输出，可以方便后面USB的开发调试，提高效率。</p>
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