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stm32: Add USB3320 ULPI low-power functions.
* This driver allows switching USB3320 ULPI to low-power mode. * Ported/adapted from ST stm32f7xx_lp_modes.c BSD-3 licensed code.
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‎ports/stm32/Makefile

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@@ -279,6 +279,7 @@ SRC_C += \
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pyb_spi.c \
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qspi.c \
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uart.c \
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ulpi.c \
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can.c \
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fdcan.c \
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pyb_can.c \

‎ports/stm32/ulpi.c

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/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* Copyright (c) 2016 STMicroelectronics. All rights reserved.
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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*
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* USB3320 ULPI functions ported from stm32f7xx_lp_modes.c
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*
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* Source file: https://github.com/STMicroelectronics/STM32CubeF7/blob/v1.15.0/Projects/STM32746G-Discovery/Examples/PWR/PWR_CurrentConsumption/Src/stm32f7xx_lp_modes.c
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*/
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#include <stdint.h>
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#include "py/mphal.h"
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#include "pin_static_af.h"
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#include "ulpi.h"
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#if MICROPY_HW_USB_HS_ULPI3320
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#include STM32_HAL_H
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#define USBULPI_PHYCR ((uint32_t)(0x40040000 + 0x034))
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#define USBULPI_D07 ((uint32_t)0x000000FF)
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#define USBULPI_New ((uint32_t)0x02000000)
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#define USBULPI_RW ((uint32_t)0x00400000)
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#define USBULPI_S_BUSY ((uint32_t)0x04000000)
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#define USBULPI_S_DONE ((uint32_t)0x08000000)
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#define USBULPI_TIMEOUT_COUNT (100)
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#define USB_OTG_READ_REG32(reg) (*(__IO uint32_t *)(reg))
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#define USB_OTG_WRITE_REG32(reg,value) (*(__IO uint32_t *)(reg) = (value))
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/**
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* @brief Read CR value
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* @param Addr the Address of the ULPI Register
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* @retval Returns value of PHY CR register
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*/
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static uint32_t USB_ULPI_Read(uint32_t Addr) {
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uint32_t val = 0;
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uint32_t timeout = USBULPI_TIMEOUT_COUNT;
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USB_OTG_WRITE_REG32(USBULPI_PHYCR, USBULPI_New | (Addr << 16));
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val = USB_OTG_READ_REG32(USBULPI_PHYCR);
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while (((val & USBULPI_S_DONE) == 0) && (timeout--)) {
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val = USB_OTG_READ_REG32(USBULPI_PHYCR);
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}
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val = USB_OTG_READ_REG32(USBULPI_PHYCR);
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return val & 0x000000ff;
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}
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/**
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* @brief Write CR value
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* @param Addr the Address of the ULPI Register
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* @param Data Data to write
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* @retval Returns value of PHY CR register
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*/
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static uint32_t USB_ULPI_Write(uint32_t Addr, uint32_t Data) {
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uint32_t val;
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uint32_t timeout = USBULPI_TIMEOUT_COUNT;
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USB_OTG_WRITE_REG32(USBULPI_PHYCR, USBULPI_New | USBULPI_RW | (Addr << 16) | (Data & 0x000000ff));
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val = USB_OTG_READ_REG32(USBULPI_PHYCR);
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while (((val & USBULPI_S_DONE) == 0) && (timeout--)) {
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val = USB_OTG_READ_REG32(USBULPI_PHYCR);
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}
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val = USB_OTG_READ_REG32(USBULPI_PHYCR);
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return 0;
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}
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/**
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* @brief This function configures the USB PHY to enter the low power mode
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* @param None
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* @retval None
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*/
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int ulpi_enter_low_power(void) {
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uint32_t regval = 0;
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// Disable ULPI_CLK by accessing ULPI_PHY
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// Read Vendor ID : (Low, High) 0x24,0x04 for USB3300
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regval = USB_ULPI_Read(0x00);
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if (regval != 0x24) {
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return MP_EIO;
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}
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regval = USB_ULPI_Read(0x01);
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if (regval != 0x04) {
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return MP_EIO;
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}
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// Read Product ID
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regval = USB_ULPI_Read(0x02);
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if (regval != 0x07) {
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return MP_EIO;
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}
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regval = USB_ULPI_Read(0x03);
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if (regval != 0x00) {
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return MP_EIO;
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}
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// Write to scratch register the pattern 0x55
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USB_ULPI_Write(0x16, 0x55);
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// Read to scratch Register and check-it again the written Pattern
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regval = USB_ULPI_Read(0x16);
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if (regval != 0x55) {
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return MP_EIO;
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}
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// Write to scratch register the pattern 0xAA
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USB_ULPI_Write(0x16, 0xAA);
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// Read to scratch Register and check-it again the written Pattern
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regval = USB_ULPI_Read(0x16);
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if (regval != 0xAA) {
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return MP_EIO;
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}
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// Read InterfaceControl reg
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regval = USB_ULPI_Read(0x07);
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// Write InterfaceControl reg,to disable PullUp on stp,
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// to avoid USB_PHY wake up when MCU entering standby
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USB_ULPI_Write(0x07, regval | 0x80);
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// Read InterfaceControl reg
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regval = USB_ULPI_Read(0x07);
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if (regval != 0x80) {
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return MP_EIO;
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}
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// Read FunctionControl reg
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regval = USB_ULPI_Read(0x04);
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// Reg 0x40 has a different value if USB is disconnected
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if (regval != 0x40 && regval != 0x45) {
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return MP_EIO;
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}
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// Write FunctionControl reg,to put PHY into LowPower mode
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USB_ULPI_Write(0x04, regval & (~0x40));
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// Read FunctionControl reg again
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regval = USB_ULPI_Read(0x04);
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if (regval != 0x00) {
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return MP_EIO;
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}
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// Wait for the transceiver clock to stop.
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HAL_Delay(10);
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return 0;
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}
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/**
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* @brief This function wakeup the USB PHY from the Low power mode
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* @param None
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* @retval None
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*/
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int ulpi_leave_low_power(void) {
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// Configure STP as an output pin
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mp_hal_pin_config(MICROPY_HW_USB_HS_ULPI_STP, MP_HAL_PIN_MODE_OUTPUT, MP_HAL_PIN_PULL_NONE, 0);
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mp_hal_pin_config_speed(MICROPY_HW_USB_HS_ULPI_STP, MP_HAL_PIN_SPEED_VERY_HIGH);
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// Configure DIR as an input pin
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mp_hal_pin_config(MICROPY_HW_USB_HS_ULPI_DIR, MP_HAL_PIN_MODE_INPUT, MP_HAL_PIN_PULL_NONE, 0);
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mp_hal_pin_config_speed(MICROPY_HW_USB_HS_ULPI_DIR, MP_HAL_PIN_SPEED_VERY_HIGH);
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// Set STP pin high
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mp_hal_pin_high(MICROPY_HW_USB_HS_ULPI_STP);
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// Wait for DIR to go low
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for (uint32_t i = 0; i < 500; i++, HAL_Delay(1)) {
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if (mp_hal_pin_read(MICROPY_HW_USB_HS_ULPI_DIR) == 0) {
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break;
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}
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}
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// Save DIR pin state before switching to alternate function
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int dir_state = mp_hal_pin_read(MICROPY_HW_USB_HS_ULPI_DIR);
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// Revert STP/DIR to their alternate functions
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mp_hal_pin_config(MICROPY_HW_USB_HS_ULPI_STP, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, GPIO_AF10_OTG_HS);
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mp_hal_pin_config_speed(MICROPY_HW_USB_HS_ULPI_STP, MP_HAL_PIN_SPEED_VERY_HIGH);
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mp_hal_pin_config(MICROPY_HW_USB_HS_ULPI_DIR, MP_HAL_PIN_MODE_ALT, MP_HAL_PIN_PULL_NONE, GPIO_AF10_OTG_HS);
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mp_hal_pin_config_speed(MICROPY_HW_USB_HS_ULPI_DIR, MP_HAL_PIN_SPEED_VERY_HIGH);
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return (dir_state == 0) ? 0 : -1;
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}
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#endif // MICROPY_HW_USB_HS_ULPI3320

‎ports/stm32/ulpi.h

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/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* Copyright (c) 2016 STMicroelectronics. All rights reserved.
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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*
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* USB3320 ULPI functions ported from stm32f7xx_lp_modes.c
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*
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* Source file: https://github.com/STMicroelectronics/STM32CubeF7/blob/v1.15.0/Projects/STM32746G-Discovery/Examples/PWR/PWR_CurrentConsumption/Src/stm32f7xx_lp_modes.c
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*/
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#ifndef MICROPY_INCLUDED_STM32_ULPI_H
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#define MICROPY_INCLUDED_STM32_ULPI_H
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int ulpi_enter_low_power(void);
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int ulpi_leave_low_power(void);
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#endif // MICROPY_INCLUDED_STM32_ULPI_H

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