mirror of
https://github.com/eddyem/STM8_samples.git
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68 lines
1.9 KiB
C
68 lines
1.9 KiB
C
/*
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* blinky.c
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*
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* Copyright 2018 Edward V. Emelianoff <eddy@sao.ru>
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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 2 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include "ports_definition.h"
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#include "uart.h"
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#include "interrupts.h"
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U8 UART_rx_cmd; // command received
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volatile U8 uart_ready = 0;// command ready flag
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/**
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* Send one byte through UART
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* @param byte - data to send
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*/
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void uart_send_byte(U8 byte){
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while(!(UART1_SR & UART_SR_TXE)); // wait until previous byte transmitted
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UART1_DR = byte;
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}
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void uart_write(char *str){
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while(*str){
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while(!(UART1_SR & UART_SR_TXE));
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UART1_CR2 |= UART_CR2_TEN;
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UART1_DR = *str++;
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}
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}
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/**
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* Read one byte from Rx buffer
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* @param byte - where to store data read
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* @return 1 in case of non-empty buffer
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*/
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U8 uart_read_cmd(U8 *byte){
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if(!uart_ready) // buffer is empty
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return 0;
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*byte = UART_rx_cmd;
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uart_ready = 0;
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return 1;
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}
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void uart_init(){
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// PD5 - UART1_TX
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PORT(UART_PORT, DDR) |= UART_TX_PIN;
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PORT(UART_PORT, CR1) |= UART_TX_PIN;
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// Configure UART
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// 8 bit, no parity, 1 stop (UART_CR1/3 = 0 - reset value)
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// 9600 on 16MHz: DIV=0x0693 -> BRR1=0x68, BRR2=0x03
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UART1_BRR1 = 0x68; UART1_BRR2 = 0x03;
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UART1_CR2 = UART_CR2_TEN | UART_CR2_REN | UART_CR2_RIEN; // Allow RX/TX, generate ints on rx
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}
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