142 lines
5.2 KiB
C
142 lines
5.2 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2021 Patrick Van Oosterwijck
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* Copyright (c) 2022 Scott Shawcroft for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "py/ringbuf.h"
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#include "py/runtime.h"
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#include "py/mphal.h"
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#include "supervisor/port.h"
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#include "supervisor/usb_serial_jtag.h"
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#include "hal/usb_serial_jtag_ll.h"
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#include "esp_intr_alloc.h"
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#include "soc/periph_defs.h"
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#define USB_SERIAL_JTAG_BUF_SIZE (64)
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STATIC ringbuf_t ringbuf;
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STATIC uint8_t buf[128];
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STATIC volatile bool connected;
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#if CIRCUITPY_ESP_USB_SERIAL_JTAG && !CONFIG_ESP_PHY_ENABLE_USB
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#error "CONFIG_ESP_PHY_ENABLE_USB must be enabled in sdkconfig"
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#endif
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// Make sure the recv interrupt is disabled during this. Otherwise, it could reorder data if it
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// interrupts itself.
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static void _copy_out_of_fifo(void) {
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size_t req_len = ringbuf_num_empty(&ringbuf);
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if (req_len == 0) {
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// Disable the interrupt so that CircuitPython can run and process the ringbuf. It will
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// re-enable the interrupt once the ringbuf is empty.
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usb_serial_jtag_ll_disable_intr_mask(USB_SERIAL_JTAG_INTR_SERIAL_OUT_RECV_PKT);
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}
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if (req_len > USB_SERIAL_JTAG_BUF_SIZE) {
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req_len = USB_SERIAL_JTAG_BUF_SIZE;
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}
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uint8_t rx_buf[USB_SERIAL_JTAG_BUF_SIZE];
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size_t len = usb_serial_jtag_ll_read_rxfifo(rx_buf, req_len);
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for (size_t i = 0; i < len; ++i) {
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if (rx_buf[i] == mp_interrupt_char) {
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mp_sched_keyboard_interrupt();
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} else {
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ringbuf_put(&ringbuf, rx_buf[i]);
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}
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}
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}
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static void usb_serial_jtag_isr_handler(void *arg) {
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uint32_t flags = usb_serial_jtag_ll_get_intsts_mask();
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if (flags & USB_SERIAL_JTAG_INTR_SOF) {
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usb_serial_jtag_ll_clr_intsts_mask(USB_SERIAL_JTAG_INTR_SOF);
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}
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if (flags & USB_SERIAL_JTAG_INTR_TOKEN_REC_IN_EP1) {
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usb_serial_jtag_ll_clr_intsts_mask(USB_SERIAL_JTAG_INTR_TOKEN_REC_IN_EP1);
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connected = true;
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}
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if (flags & USB_SERIAL_JTAG_INTR_SERIAL_OUT_RECV_PKT) {
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usb_serial_jtag_ll_clr_intsts_mask(USB_SERIAL_JTAG_INTR_SERIAL_OUT_RECV_PKT);
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_copy_out_of_fifo();
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port_wake_main_task_from_isr();
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}
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}
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void usb_serial_jtag_init(void) {
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ringbuf_init(&ringbuf, buf, sizeof(buf) - 1);
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usb_serial_jtag_ll_clr_intsts_mask(USB_SERIAL_JTAG_INTR_SOF | USB_SERIAL_JTAG_INTR_SERIAL_OUT_RECV_PKT | USB_SERIAL_JTAG_INTR_TOKEN_REC_IN_EP1);
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usb_serial_jtag_ll_ena_intr_mask(USB_SERIAL_JTAG_INTR_SOF | USB_SERIAL_JTAG_INTR_SERIAL_OUT_RECV_PKT | USB_SERIAL_JTAG_INTR_TOKEN_REC_IN_EP1);
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ESP_ERROR_CHECK(esp_intr_alloc(ETS_USB_SERIAL_JTAG_INTR_SOURCE, ESP_INTR_FLAG_LEVEL1,
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usb_serial_jtag_isr_handler, NULL, NULL));
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}
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bool usb_serial_jtag_connected(void) {
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return connected;
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}
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char usb_serial_jtag_read_char(void) {
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if (ringbuf_num_filled(&ringbuf) == 0) {
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return -1;
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}
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char c = ringbuf_get(&ringbuf);
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// Maybe re-enable the recv interrupt if we've emptied the ringbuf.
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if (ringbuf_num_filled(&ringbuf) == 0) {
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usb_serial_jtag_ll_disable_intr_mask(USB_SERIAL_JTAG_INTR_SERIAL_OUT_RECV_PKT);
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_copy_out_of_fifo();
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usb_serial_jtag_ll_ena_intr_mask(USB_SERIAL_JTAG_INTR_SERIAL_OUT_RECV_PKT);
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}
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return c;
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}
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bool usb_serial_jtag_bytes_available(void) {
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return ringbuf_num_filled(&ringbuf) > 0;
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}
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void usb_serial_jtag_write(const char *text, uint32_t length) {
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if (!usb_serial_jtag_connected()) {
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return;
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}
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size_t total_written = 0;
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while (total_written < length) {
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uint32_t start_time = supervisor_ticks_ms32();
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// Wait until we can write to the FIFO again. If it takes too long, then
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// assume we're disconnected.
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while (!usb_serial_jtag_ll_txfifo_writable()) {
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uint32_t now = supervisor_ticks_ms32();
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if (now - start_time > 200) {
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connected = false;
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return;
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}
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}
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total_written += usb_serial_jtag_ll_write_txfifo((const uint8_t *)(text + total_written), length - total_written);
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RUN_BACKGROUND_TASKS;
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}
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usb_serial_jtag_ll_txfifo_flush();
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}
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