espressif_tinyusb/hw/bsp/rp2040/family.c

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
 * Copyright (c) 2021, Ha Thach (tinyusb.org)
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * This file is part of the TinyUSB stack.
 */

#include "pico/stdlib.h"
#include "hardware/gpio.h"
#include "hardware/sync.h"
#include "hardware/structs/ioqspi.h"
#include "hardware/structs/sio.h"

#include "bsp/board.h"
#include "board.h"

#ifdef BUTTON_BOOTSEL
// This example blinks the Picoboard LED when the BOOTSEL button is pressed.
//
// Picoboard has a button attached to the flash CS pin, which the bootrom
// checks, and jumps straight to the USB bootcode if the button is pressed
// (pulling flash CS low). We can check this pin in by jumping to some code in
// SRAM (so that the XIP interface is not required), floating the flash CS
// pin, and observing whether it is pulled low.
//
// This doesn't work if others are trying to access flash at the same time,
// e.g. XIP streamer, or the other core.
bool __no_inline_not_in_flash_func(get_bootsel_button)() {
    const uint CS_PIN_INDEX = 1;

    // Must disable interrupts, as interrupt handlers may be in flash, and we
    // are about to temporarily disable flash access!
    uint32_t flags = save_and_disable_interrupts();

    // Set chip select to Hi-Z
    hw_write_masked(&ioqspi_hw->io[CS_PIN_INDEX].ctrl,
                    GPIO_OVERRIDE_LOW << IO_QSPI_GPIO_QSPI_SS_CTRL_OEOVER_LSB,
                    IO_QSPI_GPIO_QSPI_SS_CTRL_OEOVER_BITS);

    // Note we can't call into any sleep functions in flash right now
    for (volatile int i = 0; i < 1000; ++i);

    // The HI GPIO registers in SIO can observe and control the 6 QSPI pins.
    // Note the button pulls the pin *low* when pressed.
    bool button_state = (sio_hw->gpio_hi_in & (1u << CS_PIN_INDEX));

    // Need to restore the state of chip select, else we are going to have a
    // bad time when we return to code in flash!
    hw_write_masked(&ioqspi_hw->io[CS_PIN_INDEX].ctrl,
                    GPIO_OVERRIDE_NORMAL << IO_QSPI_GPIO_QSPI_SS_CTRL_OEOVER_LSB,
                    IO_QSPI_GPIO_QSPI_SS_CTRL_OEOVER_BITS);

    restore_interrupts(flags);

    return button_state;
}
#endif

void board_init(void)
{
  gpio_init(LED_PIN);
  gpio_set_dir(LED_PIN, GPIO_OUT);

  // Button
#ifndef BUTTON_BOOTSEL
#endif

#ifdef UART_DEV
  uart_init(UART_DEV, CFG_BOARD_UART_BAUDRATE);
  gpio_set_function(UART_TX_PIN, GPIO_FUNC_UART);
  gpio_set_function(UART_RX_PIN, GPIO_FUNC_UART);
#endif

  // todo probably set up device mode?
#if TUSB_OPT_DEVICE_ENABLED

#endif

#if TUSB_OPT_HOST_ENABLED
  // set portfunc to host !!!
#endif
}

//--------------------------------------------------------------------+
// Board porting API
//--------------------------------------------------------------------+

void board_led_write(bool state)
{
  gpio_put(LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
}

uint32_t board_button_read(void)
{
#ifdef BUTTON_BOOTSEL
  return BUTTON_STATE_ACTIVE == get_bootsel_button();
#else
  return 0;
#endif
}

int board_uart_read(uint8_t* buf, int len)
{
#ifdef UART_DEV
  for(int i=0;i<len;i++) {
    buf[i] = uart_getc(UART_DEV);
  }
  return len;
#else
  return 0;
#endif
}

int board_uart_write(void const * buf, int len)
{
#ifdef UART_DEV
  char const* bufch = (uint8_t const*) buf;
  for(int i=0;i<len;i++) {
    uart_putc(UART_DEV, bufch[i]);
  }
  return len;
#else
  return 0;
#endif
}

//--------------------------------------------------------------------+
// USB Interrupt Handler
// rp2040 implementation will install approriate handler when initializing
// tinyusb. There is no need to forward IRQ from application
//--------------------------------------------------------------------+