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61 lines
2.4 KiB
C
61 lines
2.4 KiB
C
// Copyright 2020 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "soc/soc.h"
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#include "soc/system_reg.h"
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#include "esp32s2/rom/gpio.h"
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#include "soc/gpio_sig_map.h"
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#include "soc/usb_periph.h"
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void gpio_pad_input_enable(uint32_t pin);
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static inline void usb_ll_init(bool external_phy)
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{
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REG_SET_BIT(DPORT_PERIP_CLK_EN0_REG, DPORT_USB_CLK_EN);
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REG_CLR_BIT(DPORT_PERIP_RST_EN0_REG, DPORT_USB_RST);
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if (external_phy) {
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REG_SET_BIT(DR_REG_USB_WRAP_BASE, BIT(18)); //set usb_pad_enable
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REG_SET_BIT(DR_REG_USB_WRAP_BASE, BIT(2)); // set reg_phy_sel (external phy)
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gpio_output_set_high(0x10, 0, 0x1E, 0xE);
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} else {
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REG_SET_BIT(DR_REG_USB_WRAP_BASE, BIT(18)); //set usb_pad_enable
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REG_CLR_BIT(DR_REG_USB_WRAP_BASE, BIT(2)); // clear reg_phy_sel (internal phy)
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//drive strength needs to be 3 for full speed
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REG_SET_FIELD(GPIO_PIN19_REG, GPIO_PIN19_PAD_DRIVER, 3);
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REG_SET_FIELD(GPIO_PIN20_REG, GPIO_PIN20_PAD_DRIVER, 3);
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}
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int i = 0;
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while (usb_periph_iopins[i].pin != -1) {
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if ((external_phy) || (usb_periph_iopins[i].ext_phy_only == 0)) {
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gpio_pad_select_gpio(usb_periph_iopins[i].pin);
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if (usb_periph_iopins[i].is_output) {
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gpio_matrix_out(usb_periph_iopins[i].pin, usb_periph_iopins[i].func, false, false);
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} else {
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gpio_matrix_in(usb_periph_iopins[i].pin, usb_periph_iopins[i].func, false);
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gpio_pad_input_enable(usb_periph_iopins[i].pin);
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}
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gpio_pad_unhold(usb_periph_iopins[i].pin);
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}
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i++;
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}
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REG_SET_BIT(DR_REG_USB_WRAP_BASE, BIT(12)); //pull override
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REG_SET_BIT(DR_REG_USB_WRAP_BASE, BIT(13)); //dp pullup
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REG_CLR_BIT(DR_REG_USB_WRAP_BASE, BIT(14)); //dp pulldwn
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REG_CLR_BIT(DR_REG_USB_WRAP_BASE, BIT(15)); //dm pullup
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REG_CLR_BIT(DR_REG_USB_WRAP_BASE, BIT(16)); //dm pulldown
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}
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