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Driver: USB: STM32L1: Managing internal pullups for usb enumeration 

This commit adds internal pullup on DP line for usb enumeration
in nucleo_l152re platform. This platform as such does not have
usb connector (device).

This has been tested with example in https://github.com/ARMmbed/
mbed-os/blob/master/drivers/usb/include/usb/USBMouse.h#L58-L76

and mbed_app.json file

"target_overrides": {
        "*": {
            "platform.stdio-baud-rate": 115200,
            "platform.all-stats-enabled": true,
            "mbed-trace.enable": "0"
        },
        "NUCLEO_L152RE": {
            "target.device_has_add": ["USBDEVICE"]
        }
    }
}

Signed-off-by: Krishna Mohan Dani <krishnamohan.d@hcl.com>
pull/14990/head
Krishna Mohan Dani 2021-08-06 19:09:36 +05:30
parent d4b15348a9
commit 3e83108f1c
1 changed files with 14 additions and 3 deletions
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17
targets/TARGET_STM/USBPhy_STM32.cpp
View File

@ -20,6 +20,9 @@
#include "USBPhyHw.h"
#include "pinmap.h"
#if defined(TARGET_STM32L1) && defined(SYSCFG_PMC_USB_PU)
#include "stm32l1xx_ll_system.h"
#endif
/* endpoint conversion macros */
#define EP_TO_LOG(ep) ((ep) & 0xF)
@ -189,15 +192,22 @@ USBPhyHw::~USBPhyHw()
}
#if defined(TARGET_STM32F1)
#if defined(TARGET_STM32F1) || defined(SYSCFG_PMC_USB_PU)
#include "drivers/DigitalOut.h"
void USB_reenumerate()
{
#if defined(SYSCFG_PMC_USB_PU)
// Manage internal pullups manually
LL_SYSCFG_DisableUSBPullUp();
wait_us(10000); // 10ms
LL_SYSCFG_EnableUSBPullUp();
#else
// Force USB_DP pin (with external pull up) to 0
mbed::DigitalOut usb_dp_pin(USB_DP, 0) ;
wait_us(10000); // 10ms
#endif
}
#endif
@ -282,9 +292,10 @@ void USBPhyHw::init(USBPhyEvents *events)
hpcd.Init.speed = PCD_SPEED_FULL;
__HAL_RCC_USB_CLK_ENABLE();
map = PinMap_USB_FS;
#if defined(TARGET_STM32F1)
#if defined(TARGET_STM32F1) || defined(SYSCFG_PMC_USB_PU)
// USB_DevConnect is empty
USB_reenumerate();
#endif
@ -407,7 +418,7 @@ void USBPhyHw::connect()
// Initializes the USB controller registers
USB_DevInit(hpcd.Instance, hpcd.Init); // hpcd.Init not used
#if defined(TARGET_STM32F1)
#if defined(TARGET_STM32F1) || defined(SYSCFG_PMC_USB_PU)
// USB_DevConnect is empty
USB_reenumerate();
#endif