Solved
[SOLVED] STM32F4 USB works intermittently
I'm using an STM32F411RET6 MCU to make a keyboard. Attached is the full schematic. Using CubeMX to generate the USB code. I'm a hobby-ist and I apologize in advance if there's a very basic issue that I've overlooked.
The problem is it works sometimes but most times it doesn't. I get the error in Windows "USB Device has malfunctioned". Looking in USB Device Viewer, i see the following error:
[Port2] FailedEnumeration : Unknown USB Device (Device Descriptor Request Failed)
Is Port User Connectable: yes
Is Port Debug Capable: no
Companion Port Number: 0
Companion Hub Symbolic Link Name:
Protocols Supported:
USB 1.1: yes
USB 2.0: yes
USB 3.0: no
---===>Device Information<===---
ConnectionStatus: FailedEnumeration
Current Config Value: 0x00 -> Device Bus Speed: Low
Device Address: 0x00
Open Pipes: 0
*!*ERROR: No open pipes!
===>Device Descriptor<===
*!*ERROR: bLength of 0 incorrect, should be 18
bLength: 0x00
bDescriptorType: 0x00
bcdUSB: 0x0000
bDeviceClass: 0x00
*!*ERROR: Device enumeration failureA few points about the setup:
- The MCU has an internal pull-up for USB. I assume I shouldn't have to do anything special to enable it i.e. it is automatically handled when I have USB enabled. Is that correct? Or is it better to add an external pull up for USB?
- I'm using an 8MHz external crystal. The configuration code is below. Is there anything wrong with the way I'm doing it? This has been generated by CubeMX after resolving clock errors. Code pasted below
void SystemClock_Config(void) {
RCC_OscInitTypeDef RCC_OscInitStruct = { 0 };
RCC_ClkInitTypeDef RCC_ClkInitStruct = { 0 };
/** Configure the main internal regulator output voltage
*/
__HAL_RCC_PWR_CLK_ENABLE()
;
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
/** Initializes the CPU, AHB and APB busses clocks
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM = 4;
RCC_OscInitStruct.PLL.PLLN = 96;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV6;
RCC_OscInitStruct.PLL.PLLQ = 4;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
Error_Handler();
}
/** Initializes the CPU, AHB and APB busses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK
| RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV2;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK) {
Error_Handler();
}
}Any suggestions will be greatly appreciated!
