forked from jappel/VersaMCU
de52b57041
Vendored and trimmed from microsoft/uf2-samdx1, adapted to the actual ATSAMD21G17D (128 KiB flash / 16 KiB RAM), fixing the flash/RAM-size mismatch that the previously commented-out SAM-BA bootloader target had (it assumed a 256 KiB SAMD21G18A). Builds as a standalone PlatformIO environment (bootloader/platformio.ini), no python2/make dependency. Compiles clean, fits in the 8 KiB bootloader region (7292/8192 bytes). Not yet flashed/verified on real hardware.
107 lines
3.5 KiB
C
107 lines
3.5 KiB
C
/* ----------------------------------------------------------------------------
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* SAM Software Package License
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* ----------------------------------------------------------------------------
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* Copyright (c) 2011-2014, Atmel Corporation
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following condition is met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the disclaimer below.
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*
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* Atmel's name may not be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
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* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
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* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* ----------------------------------------------------------------------------
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*/
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#ifndef UART_DRIVER_H
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#define UART_DRIVER_H
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#include "sam.h"
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#include <stdbool.h>
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#include <stdio.h>
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#define PINMUX_UNUSED 0xFFFFFFFF
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#define GCLK_ID_SERCOM0_CORE 0x14
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/* SERCOM UART available pad settings */
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enum uart_pad_settings {
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UART_RX_PAD0_TX_PAD2 = SERCOM_USART_CTRLA_RXPO(0) | SERCOM_USART_CTRLA_TXPO(1),
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UART_RX_PAD1_TX_PAD2 = SERCOM_USART_CTRLA_RXPO(1) | SERCOM_USART_CTRLA_TXPO(1),
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UART_RX_PAD2_TX_PAD0 = SERCOM_USART_CTRLA_RXPO(2),
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UART_RX_PAD3_TX_PAD0 = SERCOM_USART_CTRLA_RXPO(3),
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UART_RX_PAD1_TX_PAD0 = SERCOM_USART_CTRLA_RXPO(1),
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UART_RX_PAD3_TX_PAD2 = SERCOM_USART_CTRLA_RXPO(3) | SERCOM_USART_CTRLA_TXPO(1),
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};
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/**
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* \brief Gets the index of the provided SERCOM instance
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*
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* \param Pointer to SERCOM instance
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* \return Index of the SERCOM module
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*/
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uint32_t uart_get_sercom_index(Sercom *sercom_instance);
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/**
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* \brief Initializes the UART
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*
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* \param Pointer to SERCOM instance
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* \param Baud value corresponding to the desired baudrate
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* \param SERCOM pad settings
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*/
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void uart_basic_init(Sercom *sercom, uint16_t baud_val, enum uart_pad_settings pad_conf);
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/**
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* \brief Disables UART interface
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*
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* \param Pointer to SERCOM instance
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*/
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void uart_disable(Sercom *sercom);
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/**
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* \brief Sends a single byte through UART interface
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*
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* \param Pointer to SERCOM instance
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* \param Data to send
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*/
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void uart_write_byte(Sercom *sercom, uint8_t data);
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/**
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* \brief Reads a single character from UART interface
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*
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* \param Pointer to SERCOM instance
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* \return Data byte read
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*/
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uint8_t uart_read_byte(Sercom *sercom);
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/**
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* \brief Sends buffer on UART interface
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*
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* \param Pointer to SERCOM instance
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* \param Pointer to data to send
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* \param Number of bytes to send
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*/
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void uart_write_buffer_polled(Sercom *sercom, uint8_t *ptr, uint16_t length);
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/**
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* \brief Reads data on UART interface
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*
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* \param Pointer to SERCOM instance
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* \param Pointer to store read data
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* \param Number of bytes to read
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*/
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void uart_read_buffer_polled(Sercom *sercom, uint8_t *ptr, uint16_t length);
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#endif
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