mirror of
https://github.com/eddyem/stm32samples.git
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89 lines
3.1 KiB
C
89 lines
3.1 KiB
C
/*
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* This file is part of the SevenCDCs project.
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* Copyright 2022 Edward V. Emelianov <edward.emelianoff@gmail.com>.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "stm32f3.h"
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#include "hardware.h"
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#include "usart.h"
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#include "usb.h"
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#include <string.h>
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static volatile int idatalen = 0; // received data line length (including '\n')
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// USARTs registers
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static volatile USART_TypeDef *USARTx[USARTSNO+1] = {0, USART1, USART2, USART3};
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volatile int linerdy = 0, // received data ready
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dlen = 0, // length of data (including '\n') in current buffer
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bufovr = 0; // input buffer overfull
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// USARTs speeds
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static usb_LineCoding lineCodings[USARTSNO+1] = {
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{115200, USB_CDC_1_STOP_BITS, USB_CDC_NO_PARITY, 8}, {0}};
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usb_LineCoding *getLineCoding(int ifNo){
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int usartNo = ifNo - USART1_EPNO + 1;
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if(usartNo < 1 || usartNo > USARTSNO) return lineCodings;
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return & lineCodings[usartNo];
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// TODO: fixme for different settings
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//lineCoding.dwDTERate = speeds[usartNo];
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//lineCoding.bCharFormat = USB_CDC_1_STOP_BITS;
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//lineCoding.bParityType = USB_CDC_NO_PARITY;
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//lineCoding.bDataBits = 8;
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}
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void usart_putchar(uint8_t ch){
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while(!(USART1->ISR & USART_ISR_TXE));
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USART1->TDR = ch;
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}
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void usart_sendn(const uint8_t *str, int L){
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if(!str || L < 0) return;
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for(int i = 0; i < L; ++i){
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usart_putchar(str[i]);
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}
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}
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// setup all USARTs
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void usarts_setup(){
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// clock
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RCC->APB1ENR |= RCC_APB1ENR_USART2EN | RCC_APB1ENR_USART3EN;
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RCC->APB2ENR |= RCC_APB2ENR_USART1EN;
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NVIC_EnableIRQ(USART1_IRQn);
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NVIC_EnableIRQ(USART2_IRQn);
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NVIC_EnableIRQ(USART3_IRQn);
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}
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void usart_config(uint8_t ifNo, usb_LineCoding *lc){
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int usartNo = ifNo - USART1_EPNO + 1;
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if(usartNo < 1 || usartNo > USARTSNO) return;
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lineCodings[usartNo] = *lc;
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// FIXME: change also parity and so on
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volatile USART_TypeDef *U = USARTx[usartNo];
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U->ICR = 0xffffffff; // clear all flags
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U->BRR = SysFreq / lc->dwDTERate;
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U->CR1 = USART_CR1_TE | USART_CR1_RE | USART_CR1_UE | USART_CR1_RXNEIE; // 1start,8data,nstop; enable Rx,Tx,USART
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uint32_t tmout = 16000000;
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while(!(U->ISR & USART_ISR_TC)){if(--tmout == 0) break;} // polling idle frame Transmission
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U->ICR = 0xffffffff; // clear all flags again
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}
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void usart1_exti25_isr(){
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if(USART1->ISR & USART_ISR_RXNE){ // RX not emty - receive next char
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// read RDR clears flag
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uint8_t rb = USART1->RDR;
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USB_putbyte(1, rb);
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}
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}
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