diff --git a/hw/bsp/samd21/boards/trinket_m0/board.h b/hw/bsp/samd21/boards/trinket_m0/board.h new file mode 100644 index 0000000000..c8692e6bdf --- /dev/null +++ b/hw/bsp/samd21/boards/trinket_m0/board.h @@ -0,0 +1,34 @@ +/* + * The MIT License (MIT) + * + * Copyright (c) 2021 Jean Gressmann + * + * 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. + * + */ + +#pragma once + +// LED +#define LED_PIN 10 // PA10 +#define LED_STATE_ON 1 + +// UART +#define UART_SERCOM 0 + diff --git a/hw/bsp/samd21/boards/trinket_m0/board.mk b/hw/bsp/samd21/boards/trinket_m0/board.mk new file mode 100644 index 0000000000..803ffe892a --- /dev/null +++ b/hw/bsp/samd21/boards/trinket_m0/board.mk @@ -0,0 +1,5 @@ +CFLAGS += -D__SAMD21E18A__ -DCFG_EXAMPLE_VIDEO_READONLY + +# All source paths should be relative to the top level. +LD_FILE = $(BOARD_PATH)/trinket_m0.ld + diff --git a/hw/bsp/samd21/boards/trinket_m0/trinket_m0.ld b/hw/bsp/samd21/boards/trinket_m0/trinket_m0.ld new file mode 100644 index 0000000000..f0c93340cc --- /dev/null +++ b/hw/bsp/samd21/boards/trinket_m0/trinket_m0.ld @@ -0,0 +1,146 @@ +/** + * \file + * + * \brief Linker script for running in internal FLASH on the SAMD21G18A + * + * Copyright (c) 2017 Microchip Technology Inc. + * + * \asf_license_start + * + * \page License + * + * SPDX-License-Identifier: Apache-2.0 + * + * Licensed under the Apache License, Version 2.0 (the "License"); you may + * not use this file except in compliance with the License. + * You may obtain a copy of the Licence at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an AS IS BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * \asf_license_stop + * + */ + + +OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm") +OUTPUT_ARCH(arm) +SEARCH_DIR(.) + +/* Memory Spaces Definitions */ +MEMORY +{ + rom (rx) : ORIGIN = 0x00000000 + 8K, LENGTH = 0x00040000 - 8K + ram (rwx) : ORIGIN = 0x20000000, LENGTH = 0x00008000 +} + +/* The stack size used by the application. NOTE: you need to adjust according to your application. */ +STACK_SIZE = DEFINED(STACK_SIZE) ? STACK_SIZE : DEFINED(__stack_size__) ? __stack_size__ : 0x2000; + +ENTRY(Reset_Handler) + +/* Section Definitions */ +SECTIONS +{ + .text : + { + . = ALIGN(4); + _sfixed = .; + KEEP(*(.vectors .vectors.*)) + *(.text .text.* .gnu.linkonce.t.*) + *(.glue_7t) *(.glue_7) + *(.rodata .rodata* .gnu.linkonce.r.*) + *(.ARM.extab* .gnu.linkonce.armextab.*) + + /* Support C constructors, and C destructors in both user code + and the C library. This also provides support for C++ code. */ + . = ALIGN(4); + KEEP(*(.init)) + . = ALIGN(4); + __preinit_array_start = .; + KEEP (*(.preinit_array)) + __preinit_array_end = .; + + . = ALIGN(4); + __init_array_start = .; + KEEP (*(SORT(.init_array.*))) + KEEP (*(.init_array)) + __init_array_end = .; + + . = ALIGN(4); + KEEP (*crtbegin.o(.ctors)) + KEEP (*(EXCLUDE_FILE (*crtend.o) .ctors)) + KEEP (*(SORT(.ctors.*))) + KEEP (*crtend.o(.ctors)) + + . = ALIGN(4); + KEEP(*(.fini)) + + . = ALIGN(4); + __fini_array_start = .; + KEEP (*(.fini_array)) + KEEP (*(SORT(.fini_array.*))) + __fini_array_end = .; + + KEEP (*crtbegin.o(.dtors)) + KEEP (*(EXCLUDE_FILE (*crtend.o) .dtors)) + KEEP (*(SORT(.dtors.*))) + KEEP (*crtend.o(.dtors)) + + . = ALIGN(4); + _efixed = .; /* End of text section */ + } > rom + + /* .ARM.exidx is sorted, so has to go in its own output section. */ + PROVIDE_HIDDEN (__exidx_start = .); + .ARM.exidx : + { + *(.ARM.exidx* .gnu.linkonce.armexidx.*) + } > rom + PROVIDE_HIDDEN (__exidx_end = .); + + . = ALIGN(4); + _etext = .; + + .relocate : AT (_etext) + { + . = ALIGN(4); + _srelocate = .; + *(.ramfunc .ramfunc.*); + *(.data .data.*); + . = ALIGN(4); + _erelocate = .; + } > ram + + /* .bss section which is used for uninitialized data */ + .bss (NOLOAD) : + { + . = ALIGN(4); + _sbss = . ; + _szero = .; + *(.bss .bss.*) + *(COMMON) + . = ALIGN(4); + _ebss = . ; + _ezero = .; + end = .; + } > ram + + /* stack section */ + .stack (NOLOAD): + { + . = ALIGN(8); + _sstack = .; + . = . + STACK_SIZE; + . = ALIGN(8); + _estack = .; + } > ram + + . = ALIGN(4); + _end = . ; +} diff --git a/hw/bsp/samd21/family.c b/hw/bsp/samd21/family.c index 10e40e3f02..3fa6ea7d83 100644 --- a/hw/bsp/samd21/family.c +++ b/hw/bsp/samd21/family.c @@ -44,6 +44,11 @@ void USB_Handler(void) tud_int_handler(0); } +//--------------------------------------------------------------------+ +// UART support +//--------------------------------------------------------------------+ +void uart_init(void); + //--------------------------------------------------------------------+ // MACRO TYPEDEF CONSTANT ENUM DECLARATION //--------------------------------------------------------------------+ @@ -84,6 +89,8 @@ void board_init(void) gpio_set_pin_pull_mode(BUTTON_PIN, BUTTON_STATE_ACTIVE ? GPIO_PULL_DOWN : GPIO_PULL_UP); #endif + uart_init(); + #if CFG_TUSB_OS == OPT_OS_FREERTOS // If freeRTOS is used, IRQ priority is limit by max syscall ( smaller is higher ) NVIC_SetPriority(USB_IRQn, configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY); @@ -138,6 +145,81 @@ uint32_t board_button_read(void) #endif } +#if defined(UART_SERCOM) + +#define BOARD_SERCOM2(n) SERCOM ## n +#define BOARD_SERCOM(n) BOARD_SERCOM2(n) + +void uart_init(void) +{ +#if UART_SERCOM == 0 + gpio_set_pin_function(PIN_PA06, PINMUX_PA06D_SERCOM0_PAD2); + gpio_set_pin_function(PIN_PA07, PINMUX_PA07D_SERCOM0_PAD3); + + // setup clock (48MHz) + _pm_enable_bus_clock(PM_BUS_APBC, SERCOM0); + _gclk_enable_channel(SERCOM0_GCLK_ID_CORE, GCLK_CLKCTRL_GEN_GCLK0_Val); + + SERCOM0->USART.CTRLA.bit.SWRST = 1; /* reset SERCOM & enable config */ + while(SERCOM0->USART.SYNCBUSY.bit.SWRST); + + SERCOM0->USART.CTRLA.reg = /* CMODE = 0 -> async, SAMPA = 0, FORM = 0 -> USART frame, SMPR = 0 -> arithmetic baud rate */ + SERCOM_USART_CTRLA_SAMPR(1) | /* 0 = 16x / arithmetic baud rate, 1 = 16x / fractional baud rate */ +// SERCOM_USART_CTRLA_FORM(0) | /* 0 = USART Frame, 2 = LIN Master */ + SERCOM_USART_CTRLA_DORD | /* LSB first */ + SERCOM_USART_CTRLA_MODE(1) | /* 0 = Asynchronous, 1 = USART with internal clock */ + SERCOM_USART_CTRLA_RXPO(3) | /* pad 3 */ + SERCOM_USART_CTRLA_TXPO(1); /* pad 2 */ + + SERCOM0->USART.CTRLB.reg = + SERCOM_USART_CTRLB_TXEN | /* tx enabled */ + SERCOM_USART_CTRLB_RXEN; /* rx enabled */ + + SERCOM0->USART.BAUD.reg = SERCOM_USART_BAUD_FRAC_FP(0) | SERCOM_USART_BAUD_FRAC_BAUD(26); + + SERCOM0->USART.CTRLA.bit.ENABLE = 1; /* activate SERCOM */ + while(SERCOM0->USART.SYNCBUSY.bit.ENABLE); /* wait for SERCOM to be ready */ +#endif +} + +static inline void uart_send_buffer(uint8_t const *text, size_t len) +{ + for (size_t i = 0; i < len; ++i) { + BOARD_SERCOM(UART_SERCOM)->USART.DATA.reg = text[i]; + while((BOARD_SERCOM(UART_SERCOM)->USART.INTFLAG.reg & SERCOM_USART_INTFLAG_TXC) == 0); + } +} + +static inline void uart_send_str(const char* text) +{ + while (*text) { + BOARD_SERCOM(UART_SERCOM)->USART.DATA.reg = *text++; + while((BOARD_SERCOM(UART_SERCOM)->USART.INTFLAG.reg & SERCOM_USART_INTFLAG_TXC) == 0); + } +} + +int board_uart_read(uint8_t* buf, int len) +{ + (void) buf; (void) len; + return 0; +} + +int board_uart_write(void const * buf, int len) +{ + if (len < 0) { + uart_send_str(buf); + } else { + uart_send_buffer(buf, len); + } + return len; +} + +#else // ! defined(UART_SERCOM) +void uart_init(void) +{ + +} + int board_uart_read(uint8_t* buf, int len) { (void) buf; (void) len; @@ -149,6 +231,7 @@ int board_uart_write(void const * buf, int len) (void) buf; (void) len; return 0; } +#endif #if CFG_TUSB_OS == OPT_OS_NONE volatile uint32_t system_ticks = 0;