250 lines
7.4 KiB
C
250 lines
7.4 KiB
C
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/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2019 Ha Thach (tinyusb.org)
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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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* This file is part of the TinyUSB stack.
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*/
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#include "sam.h"
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#include "bsp/board.h"
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#include "board.h"
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#include "hal/include/hal_gpio.h"
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#include "hal/include/hal_init.h"
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#include "hri/hri_nvmctrl_d21.h"
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#include "hpl/gclk/hpl_gclk_base.h"
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#include "hpl_pm_config.h"
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#include "hpl/pm/hpl_pm_base.h"
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//--------------------------------------------------------------------+
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// Forward USB interrupt events to TinyUSB IRQ Handler
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//--------------------------------------------------------------------+
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void USB_Handler(void)
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{
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tud_int_handler(0);
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}
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//--------------------------------------------------------------------+
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// UART support
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//--------------------------------------------------------------------+
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static void uart_init(void);
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//--------------------------------------------------------------------+
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// MACRO TYPEDEF CONSTANT ENUM DECLARATION
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//--------------------------------------------------------------------+
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/* Referenced GCLKs, should be initialized firstly */
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#define _GCLK_INIT_1ST (1 << 0 | 1 << 1)
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/* Not referenced GCLKs, initialized last */
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#define _GCLK_INIT_LAST (~_GCLK_INIT_1ST)
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void board_init(void)
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{
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// Clock init ( follow hpl_init.c )
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hri_nvmctrl_set_CTRLB_RWS_bf(NVMCTRL, 2);
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_pm_init();
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_sysctrl_init_sources();
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#if _GCLK_INIT_1ST
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_gclk_init_generators_by_fref(_GCLK_INIT_1ST);
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#endif
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_sysctrl_init_referenced_generators();
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_gclk_init_generators_by_fref(_GCLK_INIT_LAST);
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// Update SystemCoreClock since it is hard coded with asf4 and not correct
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// Init 1ms tick timer (samd SystemCoreClock may not correct)
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SystemCoreClock = CONF_CPU_FREQUENCY;
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#if CFG_TUSB_OS == OPT_OS_NONE
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SysTick_Config(CONF_CPU_FREQUENCY / 1000);
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#endif
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// Led init
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#ifdef LED_PIN
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gpio_set_pin_direction(LED_PIN, GPIO_DIRECTION_OUT);
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board_led_write(false);
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#endif
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// Button init
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#ifdef BUTTON_PIN
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gpio_set_pin_direction(BUTTON_PIN, GPIO_DIRECTION_IN);
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gpio_set_pin_pull_mode(BUTTON_PIN, BUTTON_STATE_ACTIVE ? GPIO_PULL_DOWN : GPIO_PULL_UP);
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#endif
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uart_init();
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#if CFG_TUSB_OS == OPT_OS_FREERTOS
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// If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher )
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NVIC_SetPriority(USB_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY);
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#endif
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/* USB Clock init
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* The USB module requires a GCLK_USB of 48 MHz ~ 0.25% clock
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* for low speed and full speed operation. */
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_pm_enable_bus_clock(PM_BUS_APBB, USB);
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_pm_enable_bus_clock(PM_BUS_AHB, USB);
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_gclk_enable_channel(USB_GCLK_ID, GCLK_CLKCTRL_GEN_GCLK0_Val);
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// USB Pin Init
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gpio_set_pin_direction(PIN_PA24, GPIO_DIRECTION_OUT);
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gpio_set_pin_level(PIN_PA24, false);
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gpio_set_pin_pull_mode(PIN_PA24, GPIO_PULL_OFF);
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gpio_set_pin_direction(PIN_PA25, GPIO_DIRECTION_OUT);
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gpio_set_pin_level(PIN_PA25, false);
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gpio_set_pin_pull_mode(PIN_PA25, GPIO_PULL_OFF);
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gpio_set_pin_function(PIN_PA24, PINMUX_PA24G_USB_DM);
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gpio_set_pin_function(PIN_PA25, PINMUX_PA25G_USB_DP);
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// Output 500hz PWM on D12 (PA19 - TCC0 WO[3]) so we can validate the GCLK0 clock speed with a Saleae.
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_pm_enable_bus_clock(PM_BUS_APBC, TCC0);
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TCC0->PER.bit.PER = 48000000 / 1000;
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TCC0->CC[3].bit.CC = 48000000 / 2000;
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TCC0->CTRLA.bit.ENABLE = true;
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gpio_set_pin_function(PIN_PA19, PINMUX_PA19F_TCC0_WO3);
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_gclk_enable_channel(TCC0_GCLK_ID, GCLK_CLKCTRL_GEN_GCLK0_Val);
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}
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//--------------------------------------------------------------------+
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// Board porting API
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//--------------------------------------------------------------------+
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void board_led_write(bool state)
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{
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(void)state;
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#ifdef LED_PIN
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gpio_set_pin_level(LED_PIN, state ? LED_STATE_ON : (1-LED_STATE_ON));
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#endif
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}
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uint32_t board_button_read(void)
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{
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#ifdef BUTTON_PIN
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return BUTTON_STATE_ACTIVE == gpio_get_pin_level(BUTTON_PIN);
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#else
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return 0;
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#endif
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}
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#if defined(UART_SERCOM)
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#define BOARD_SERCOM2(n) SERCOM ## n
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#define BOARD_SERCOM(n) BOARD_SERCOM2(n)
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static void uart_init(void)
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{
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#if UART_SERCOM == 0
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gpio_set_pin_function(PIN_PA06, PINMUX_PA06D_SERCOM0_PAD2);
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gpio_set_pin_function(PIN_PA07, PINMUX_PA07D_SERCOM0_PAD3);
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// setup clock (48MHz)
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_pm_enable_bus_clock(PM_BUS_APBC, SERCOM0);
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_gclk_enable_channel(SERCOM0_GCLK_ID_CORE, GCLK_CLKCTRL_GEN_GCLK0_Val);
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SERCOM0->USART.CTRLA.bit.SWRST = 1; /* reset SERCOM & enable config */
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while(SERCOM0->USART.SYNCBUSY.bit.SWRST);
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SERCOM0->USART.CTRLA.reg = /* CMODE = 0 -> async, SAMPA = 0, FORM = 0 -> USART frame, SMPR = 0 -> arithmetic baud rate */
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SERCOM_USART_CTRLA_SAMPR(1) | /* 0 = 16x / arithmetic baud rate, 1 = 16x / fractional baud rate */
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// SERCOM_USART_CTRLA_FORM(0) | /* 0 = USART Frame, 2 = LIN Master */
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SERCOM_USART_CTRLA_DORD | /* LSB first */
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SERCOM_USART_CTRLA_MODE(1) | /* 0 = Asynchronous, 1 = USART with internal clock */
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SERCOM_USART_CTRLA_RXPO(3) | /* pad 3 */
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SERCOM_USART_CTRLA_TXPO(1); /* pad 2 */
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SERCOM0->USART.CTRLB.reg =
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SERCOM_USART_CTRLB_TXEN | /* tx enabled */
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SERCOM_USART_CTRLB_RXEN; /* rx enabled */
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SERCOM0->USART.BAUD.reg = SERCOM_USART_BAUD_FRAC_FP(0) | SERCOM_USART_BAUD_FRAC_BAUD(26);
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SERCOM0->USART.CTRLA.bit.ENABLE = 1; /* activate SERCOM */
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while(SERCOM0->USART.SYNCBUSY.bit.ENABLE); /* wait for SERCOM to be ready */
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#endif
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}
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static inline void uart_send_buffer(uint8_t const *text, size_t len)
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{
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for (size_t i = 0; i < len; ++i) {
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BOARD_SERCOM(UART_SERCOM)->USART.DATA.reg = text[i];
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while((BOARD_SERCOM(UART_SERCOM)->USART.INTFLAG.reg & SERCOM_USART_INTFLAG_TXC) == 0);
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}
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}
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static inline void uart_send_str(const char* text)
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{
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while (*text) {
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BOARD_SERCOM(UART_SERCOM)->USART.DATA.reg = *text++;
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while((BOARD_SERCOM(UART_SERCOM)->USART.INTFLAG.reg & SERCOM_USART_INTFLAG_TXC) == 0);
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}
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}
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int board_uart_read(uint8_t* buf, int len)
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{
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(void) buf; (void) len;
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return 0;
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}
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int board_uart_write(void const * buf, int len)
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{
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if (len < 0) {
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uart_send_str(buf);
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} else {
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uart_send_buffer(buf, len);
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}
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return len;
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}
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#else // ! defined(UART_SERCOM)
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static void uart_init(void)
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{
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}
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int board_uart_read(uint8_t* buf, int len)
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{
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(void) buf; (void) len;
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return 0;
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}
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int board_uart_write(void const * buf, int len)
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{
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(void) buf; (void) len;
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return 0;
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}
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#endif
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#if CFG_TUSB_OS == OPT_OS_NONE
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volatile uint32_t system_ticks = 0;
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void SysTick_Handler (void)
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{
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system_ticks++;
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}
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uint32_t board_millis(void)
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{
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return system_ticks;
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}
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#endif
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