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/*
* main.c
*
* Copyright 2017 Edward V. Emelianoff <eddy@sao.ru, edward.emelianoff@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#include "hardware.h"
#include "usart.h"
#include "usb.h"
#include "usb_lib.h"
#include <string.h> // memcpy
volatile uint32_t Tms = 0;
/* Called when systick fires */
void sys_tick_handler(void){
++Tms;
}
void iwdg_setup(){
uint32_t tmout = 16000000;
/* Enable the peripheral clock RTC */
/* (1) Enable the LSI (40kHz) */
/* (2) Wait while it is not ready */
RCC->CSR |= RCC_CSR_LSION; /* (1) */
while((RCC->CSR & RCC_CSR_LSIRDY) != RCC_CSR_LSIRDY){if(--tmout == 0) break;} /* (2) */
/* Configure IWDG */
/* (1) Activate IWDG (not needed if done in option bytes) */
/* (2) Enable write access to IWDG registers */
/* (3) Set prescaler by 64 (1.6ms for each tick) */
/* (4) Set reload value to have a rollover each 2s */
/* (5) Check if flags are reset */
/* (6) Refresh counter */
IWDG->KR = IWDG_START; /* (1) */
IWDG->KR = IWDG_WRITE_ACCESS; /* (2) */
IWDG->PR = IWDG_PR_PR_1; /* (3) */
IWDG->RLR = 1250; /* (4) */
tmout = 16000000;
while(IWDG->SR){if(--tmout == 0) break;} /* (5) */
IWDG->KR = IWDG_REFRESH; /* (6) */
}
static usb_LineCoding new_lc;
static uint8_t lcchange = 0;
static void show_new_lc(){
SEND("got new linecoding:");
SEND(" baudrate="); printu(new_lc.dwDTERate);
SEND(", charFormat="); printu(new_lc.bCharFormat);
SEND(" (");
switch(new_lc.bCharFormat){
case USB_CDC_1_STOP_BITS:
usart_putchar('1');
break;
case USB_CDC_1_5_STOP_BITS:
SEND("1.5");
break;
case USB_CDC_2_STOP_BITS:
usart_putchar('2');
break;
default:
usart_putchar('?');
}
SEND(" stop bits), parityType="); printu(new_lc.bParityType);
SEND(" (");
switch(new_lc.bParityType){
case USB_CDC_NO_PARITY:
SEND("no");
break;
case USB_CDC_ODD_PARITY:
SEND("odd");
break;
case USB_CDC_EVEN_PARITY:
SEND("even");
break;
case USB_CDC_MARK_PARITY:
SEND("mark");
break;
case USB_CDC_SPACE_PARITY:
SEND("space");
break;
default:
SEND("unknown");
}
SEND(" parity), dataBits="); printu(new_lc.bDataBits);
usart_putchar('\n');
lcchange = 0;
}
void linecoding_handler(usb_LineCoding *lc){
memcpy(&new_lc, lc, sizeof(usb_LineCoding));
lcchange = 1;
}
void clstate_handler(uint16_t val){
SEND("change control line state to ");
printu(val);
if(val & CONTROL_DTR) SEND(" (DTR)");
if(val & CONTROL_RTS) SEND(" (RTS)");
usart_putchar('\n');
}
int main(void){
uint32_t lastT = 0;
int L = 0;
char *txt;
char tmpbuf[129];
sysreset();
SysTick_Config(6000, 1);
gpio_setup();
usart_setup();
SEND("Hello!\n");
if(RCC->CSR & RCC_CSR_IWDGRSTF){ // watchdog reset occured
SEND("WDGRESET=1\n");
}
if(RCC->CSR & RCC_CSR_SFTRSTF){ // software reset occured
SEND("SOFTRESET=1\n");
}
RCC->CSR |= RCC_CSR_RMVF; // remove reset flags
USB_setup();
iwdg_setup();
while (1){
IWDG->KR = IWDG_REFRESH; // refresh watchdog
if(lastT > Tms || Tms - lastT > 499){
LED_blink(LED0);
lastT = Tms;
transmit_tbuf(); // non-blocking transmission of data from UART buffer every 0.5s
}
usb_proc();
uint8_t r = 0;
if((r = USB_receive(tmpbuf, 128))){
tmpbuf[r] = 0;
SEND("Received data over USB:\n");
SEND(tmpbuf);
newline();
}
if(usartrx()){ // usart1 received data, store in in buffer
L = usart_getline(&txt);
char _1st = txt[0];
if(L == 2 && txt[1] == '\n'){
L = 0;
switch(_1st){
case 'C':
SEND("USB ");
if(!USB_configured()) SEND("dis");
SEND("connected\n");
break;
case 'L':
USB_send("Very long test string for USB (it's length is more than 64 bytes\n"
"This is another part of the string! Can you see all of this?\n");
SEND("Long test sent\n");
break;
case 'R':
SEND("Soft reset\n");
NVIC_SystemReset();
break;
case 'S':
USB_send("Test string for USB\n");
SEND("Short test sent\n");
break;
case 'W':
SEND("Wait for reboot\n");
while(1){nop();};
break;
default: // help
SEND(
"'C' - test if USB is configured\n"
"'L' - send long string over USB\n"
"'R' - software reset\n"
"'S' - send short string over USB\n"
"'W' - test watchdog\n"
);
break;
}
}
transmit_tbuf();
}
if(L){ // echo all other data
txt[L] = 0;
usart_send(txt);
L = 0;
}
if(lcchange){
show_new_lc();
}
}
return 0;
}
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