e20321b757
USB pin configuration is not moved into header, since it cannot reasonably be changed on SAMD11 platform. In order to change the UART pin configuration, the SERCOM interface configuration has to be changed, too. Thus those configuration defines are moved into the `hal_config.h' header as well.
215 lines
6.4 KiB
C
215 lines
6.4 KiB
C
/*
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* Copyright (c) 2017, Alex Taradov <alex@taradov.com>
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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 conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*- Includes ----------------------------------------------------------------*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#include "samd11.h"
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#include "hal_config.h"
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#include "uart.h"
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#include "usb_cdc.h"
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/*- Definitions -------------------------------------------------------------*/
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#define UART_BUF_SIZE 256
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/*- Types ------------------------------------------------------------------*/
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typedef struct
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{
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int wr;
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int rd;
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uint8_t data[UART_BUF_SIZE];
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} fifo_buffer_t;
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/*- Variables --------------------------------------------------------------*/
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static volatile fifo_buffer_t uart_rx_fifo;
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static volatile fifo_buffer_t uart_tx_fifo;
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/*- Implementations ---------------------------------------------------------*/
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//-----------------------------------------------------------------------------
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void uart_init(usb_cdc_line_coding_t *line_coding)
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{
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int chsize, form, pmode, sbmode, baud, fp;
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HAL_GPIO_UART_TX_pmuxen(UART_SERCOM_PMUX);
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HAL_GPIO_UART_RX_pullup();
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HAL_GPIO_UART_RX_pmuxen(UART_SERCOM_PMUX);
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PM->APBCMASK.reg |= UART_SERCOM_APBCMASK;
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GCLK->CLKCTRL.reg = GCLK_CLKCTRL_ID(UART_SERCOM_GCLK_ID) |
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GCLK_CLKCTRL_CLKEN | GCLK_CLKCTRL_GEN(0);
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UART_SERCOM->USART.CTRLA.reg = SERCOM_USART_CTRLA_SWRST;
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while (UART_SERCOM->USART.CTRLA.bit.SWRST);
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uart_tx_fifo.wr = 0;
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uart_tx_fifo.rd = 0;
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uart_rx_fifo.wr = 0;
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uart_rx_fifo.rd = 0;
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if (USB_CDC_5_DATA_BITS == line_coding->bDataBits)
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chsize = 5;
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else if (USB_CDC_6_DATA_BITS == line_coding->bDataBits)
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chsize = 6;
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else if (USB_CDC_7_DATA_BITS == line_coding->bDataBits)
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chsize = 7;
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else if (USB_CDC_8_DATA_BITS == line_coding->bDataBits)
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chsize = 0;
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else
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chsize = 0;
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if (USB_CDC_NO_PARITY == line_coding->bParityType)
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form = 0;
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else
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form = 1;
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if (USB_CDC_EVEN_PARITY == line_coding->bParityType)
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pmode = 0;
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else
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pmode = SERCOM_USART_CTRLB_PMODE;
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if (USB_CDC_1_STOP_BIT == line_coding->bCharFormat)
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sbmode = 0;
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else
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sbmode = SERCOM_USART_CTRLB_SBMODE;
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baud = F_CPU / (16 * line_coding->dwDTERate);
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fp = (F_CPU / line_coding->dwDTERate - 16 * baud) / 2;
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UART_SERCOM->USART.CTRLA.reg =
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SERCOM_USART_CTRLA_DORD | SERCOM_USART_CTRLA_MODE_USART_INT_CLK |
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SERCOM_USART_CTRLA_FORM(form) | SERCOM_USART_CTRLA_SAMPR(1) |
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SERCOM_USART_CTRLA_RXPO(UART_SERCOM_RXPO) |
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SERCOM_USART_CTRLA_TXPO(UART_SERCOM_TXPO);
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UART_SERCOM->USART.CTRLB.reg = SERCOM_USART_CTRLB_RXEN | SERCOM_USART_CTRLB_TXEN |
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SERCOM_USART_CTRLB_CHSIZE(chsize) | pmode | sbmode;
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UART_SERCOM->USART.BAUD.reg =
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SERCOM_USART_BAUD_FRACFP_BAUD(baud) | SERCOM_USART_BAUD_FRACFP_FP(fp);
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UART_SERCOM->USART.CTRLA.reg |= SERCOM_USART_CTRLA_ENABLE;
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UART_SERCOM->USART.INTENSET.reg = SERCOM_USART_INTENSET_RXC;
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NVIC_EnableIRQ(UART_SERCOM_IRQ_INDEX);
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}
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//-----------------------------------------------------------------------------
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bool uart_write_byte(int byte)
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{
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int wr = (uart_tx_fifo.wr + 1) % UART_BUF_SIZE;
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bool res = false;
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NVIC_DisableIRQ(UART_SERCOM_IRQ_INDEX);
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if (wr != uart_tx_fifo.rd)
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{
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uart_tx_fifo.data[uart_tx_fifo.wr] = byte;
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uart_tx_fifo.wr = wr;
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res = true;
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UART_SERCOM->USART.INTENSET.reg = SERCOM_USART_INTENSET_DRE;
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}
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NVIC_EnableIRQ(UART_SERCOM_IRQ_INDEX);
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return res;
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}
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//-----------------------------------------------------------------------------
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bool uart_read_byte(int *byte)
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{
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bool res = false;
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NVIC_DisableIRQ(UART_SERCOM_IRQ_INDEX);
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if (uart_rx_fifo.rd != uart_rx_fifo.wr)
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{
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*byte = uart_rx_fifo.data[uart_rx_fifo.rd];
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uart_rx_fifo.rd = (uart_rx_fifo.rd + 1) % UART_BUF_SIZE;
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res = true;
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}
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NVIC_EnableIRQ(UART_SERCOM_IRQ_INDEX);
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return res;
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}
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//-----------------------------------------------------------------------------
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void UART_SERCOM_IRQ_HANDLER(void)
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{
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int flags = UART_SERCOM->USART.INTFLAG.reg;
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if (flags & SERCOM_USART_INTFLAG_RXC)
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{
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int status = UART_SERCOM->USART.STATUS.reg;
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int byte = UART_SERCOM->USART.DATA.reg;
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int wr = (uart_rx_fifo.wr + 1) % UART_BUF_SIZE;
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if (status & SERCOM_USART_STATUS_BUFOVF)
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uart_serial_state_update(USB_CDC_SERIAL_STATE_OVERRUN);
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if (status & SERCOM_USART_STATUS_FERR)
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uart_serial_state_update(USB_CDC_SERIAL_STATE_FRAMING);
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if (status & SERCOM_USART_STATUS_PERR)
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uart_serial_state_update(USB_CDC_SERIAL_STATE_PARITY);
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if (wr == uart_rx_fifo.rd)
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{
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uart_serial_state_update(USB_CDC_SERIAL_STATE_OVERRUN);
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}
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else
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{
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uart_rx_fifo.data[uart_rx_fifo.wr] = byte;
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uart_rx_fifo.wr = wr;
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}
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}
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if (flags & SERCOM_USART_INTFLAG_DRE)
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{
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if (uart_tx_fifo.rd == uart_tx_fifo.wr)
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{
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UART_SERCOM->USART.INTENCLR.reg = SERCOM_USART_INTENCLR_DRE;
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}
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else
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{
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UART_SERCOM->USART.DATA.reg = uart_tx_fifo.data[uart_tx_fifo.rd];
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uart_tx_fifo.rd = (uart_tx_fifo.rd + 1) % UART_BUF_SIZE;
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}
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}
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}
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