avr/main.c

   1 /*
   2  * (C) Copyright 2014 Leo C. <erbl259-lmu@yahoo.de>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0
   5  */
   6
   7
   8 #include "common.h"
   9 #include <avr/interrupt.h>
  10 #include <avr/wdt.h>
  11 #include <stdlib.h>
  12
  13 #include "config.h"
  14 #include "ff.h"
  15 #include "z80-if.h"
  16 #include "i2c.h"
  17 #include "con-utils.h"
  18 #include "serial.h"
  19 #include "timer.h"
  20 #include "cli.h"
  21 #include "env.h"
  22 #include "z180-serv.h"
  23 #include "gpio.h"
  24 #include "time.h"
  25 #include "rtc.h"
  26 #include "debug.h"
  27 #include "cmd_fat.h"
  28
  29
  30 uint8_t mcusr __attribute__ ((section (".noinit")));
  31
  32 #if DEBUG
  33 __attribute__ ((naked)) __attribute__ ((section (".init3")))
  34 void preset_ram (void)
  35 {
  36         for (uint8_t *p = (uint8_t *) RAMSTART; p <= (uint8_t *) RAMEND; p++)
  37                 *p = 0xdd;
  38
  39 }
  40 #endif
  41
  42 __attribute__ ((naked)) __attribute__ ((section (".init3")))
  43 void get_mcusr (void)
  44 {
  45         /* save and clear reset reason(s) */
  46         /* TODO: move to init section? */
  47         mcusr = MCUSR;
  48         MCUSR = 0;
  49
  50         wdt_disable();
  51 }
  52
  53 /*--------------------------------------------------------------------------*/
  54 #if DEBUG
  55
  56 static const FLASH char * const FLASH rreasons[] = {
  57                         FSTR("Power on"),
  58                         FSTR("External"),
  59                         FSTR("Brown out"),
  60                         FSTR("Watchdog"),
  61                         FSTR("JTAG"),
  62                 };
  63
  64 static
  65 void print_reset_reason(void)
  66 {
  67         uint8_t r = mcusr & 0x1f;
  68         const FLASH char * const FLASH *p = rreasons;
  69
  70         my_puts_P(PSTR("### Reset reason(s): "));
  71         if (r == 0)
  72                 my_puts_P(PSTR("none"));
  73         for ( ; r; p++, r >>= 1) {
  74                 if (r & 1) {
  75                         my_puts_P(*p);
  76                         if (r & ~1)
  77                                 my_puts_P(PSTR(", "));
  78                 }
  79         }
  80         my_puts_P(PSTR(".\n"));
  81 }
  82
  83 #endif
  84
  85 ISR(INT5_vect)
  86 {
  87         Stat |= S_MSG_PENDING;
  88 }
  89
  90 ISR(INT6_vect)
  91 {
  92         Stat |= S_CON_PENDING;
  93 }
  94
  95 static
  96 void setup_avr(void)
  97 {
  98         /* CPU */
  99
 100         /* Disable JTAG Interface regardless of the JTAGEN fuse setting. */
 101         MCUCR = _BV(JTD);
 102         MCUCR = _BV(JTD);
 103
 104         /* Disable peripherals. Enable individually in respective init function. */
 105         PRR0 = _BV(PRTWI) |
 106                 _BV(PRTIM2) | _BV(PRTIM0) | _BV(PRTIM1) |
 107                 _BV(PRSPI) | _BV(PRUSART0) | _BV(PRADC);
 108
 109         PRR1 = _BV(PRTIM5) | _BV(PRTIM4) | _BV(PRTIM3) |
 110                 _BV(PRUSART3) | _BV(PRUSART2) | _BV(PRUSART1);
 111
 112
 113         /* disable analog comparator */
 114         ACSR = _BV(ACD);
 115         /* Ports */
 116
 117         /* Clock */
 118         CLKPR = _BV(CLKPCE);
 119         CLKPR = 0;
 120
 121         /* Timer */
 122         PRR1 &= ~_BV(PRTIM4);
 123         OCR4A = F_CPU / 1000 - 1;       /* Timer4: 1000Hz interval */
 124         TCCR4B = (0b00<<WGM42)|(0b001<<CS40); /* Normal Mode, Prescaler 1 */
 125         TIMSK4 = _BV(OCIE4A);           /* Enable Output Compare A interrupt */
 126
 127         /* INT5, INT6: falling edge */
 128         EICRB = (EICRB & ~((0b11 << ISC50) | (0b11 << ISC60))) |
 129                 (0b10 << ISC50) | (0b10 << ISC60);
 130         /* Reset pending ints */
 131         EIFR |= _BV(INTF5) | _BV(INTF6);
 132         /* Enable INT5, and INT6 */
 133         EIMSK |= _BV(INT5) | _BV(INT6);
 134 }
 135
 136 static
 137 int reset_reason_is_power_on(void)
 138 {
 139         return (mcusr & _BV(PORF)) != 0;
 140 }
 141
 142 static
 143 void setup_system_time(void)
 144 {
 145         struct tm rtc_time;
 146
 147         rtc_get(&rtc_time);
 148         rtc_time.tm_isdst = 0;
 149         set_system_time(mk_gmtime(&rtc_time) );
 150 }
 151
 152
 153 /*--------------------------------------------------------------------------*/
 154
 155 /* Stored value of bootdelay, used by autoboot_command() */
 156 static int  stored_bootdelay;
 157
 158
 159 /***************************************************************************
 160  * Watch for 'delay' seconds for autoboot stop.
 161  * returns: 0 - no key, allow autoboot
 162  *          1 - got key, abort
 163  */
 164
 165 static int abortboot(int  bootdelay)
 166 {
 167         int abort = 0;
 168         uint32_t ts;
 169
 170         if (bootdelay >= 0)
 171                 printf_P(PSTR("Hit any key to stop autoboot: %2d "), bootdelay);
 172
 173 #if defined CONFIG_ZERO_BOOTDELAY_CHECK
 174         /*
 175          * Check if key already pressed
 176          * Don't check if bootdelay < 0
 177          */
 178         if (bootdelay >= 0) {
 179                 if (tstc()) {   /* we got a key press   */
 180                         (void) my_getchar(1);  /* consume input */
 181                         my_puts_P(PSTR("\b\b\b 0"));
 182                         abort = 1;      /* don't auto boot      */
 183                 }
 184         }
 185 #endif
 186
 187         while ((bootdelay > 0) && (!abort)) {
 188                 --bootdelay;
 189                 /* delay 1000 ms */
 190                 ts = get_timer(0);
 191                 do {
 192                         if (tstc()) {   /* we got a key press   */
 193                                 abort  = 1;     /* don't auto boot      */
 194                                 bootdelay = 0;  /* no more delay        */
 195                                 break;
 196                         }
 197                         udelay(10000);
 198                 } while (!abort && get_timer(ts) < 1000);
 199
 200                 printf_P(PSTR("\b\b\b%2d "), bootdelay);
 201         }
 202
 203         putchar('\n');
 204
 205         return abort;
 206 }
 207
 208 static
 209 const char *bootdelay_process(void)
 210 {
 211         char *s;
 212         int bootdelay;
 213
 214         bootdelay = (int) getenv_ulong(PSTR(ENV_BOOTDELAY), 10, CONFIG_BOOTDELAY);
 215
 216
 217         debug("### main_loop entered: bootdelay=%d\n\n", bootdelay);
 218         _delay_ms(20);
 219
 220         s = getenv_str(PSTR(ENV_BOOTCMD));
 221         stored_bootdelay = bootdelay;
 222         return s;
 223 }
 224
 225 static
 226 void autoboot_command(const char *s)
 227 {
 228         debug("### main_loop: bootcmd=\"%s\"\n", s ? s : "");
 229         _delay_ms(20);
 230
 231         if (stored_bootdelay != -1 && s && !abortboot(stored_bootdelay)) {
 232                 run_command_list(s, -1);
 233         }
 234 }
 235
 236
 237 static
 238 void main_loop(void)
 239 {
 240         const char *s;
 241
 242         s = bootdelay_process();
 243         autoboot_command(s);
 244         cli_loop();
 245 }
 246
 247 int main(void)
 248 {
 249         extern void setup_mmc(void);
 250
 251         __malloc_margin = CONFIG_SYS_MALLOC_MARGIN;
 252         setup_avr();
 253         for (int i = 0; i < GPIO_MAX; i++)
 254                 gpio_config(i, INPUT_PULLUP);
 255         setup_mmc();
 256         env_init();
 257         z80_setup_bus();
 258
 259         if (reset_reason_is_power_on())
 260                 _delay_ms(CONFIG_PWRON_DELAY);
 261
 262         serial_setup(getenv_ulong(PSTR(ENV_BAUDRATE), 10, CONFIG_BAUDRATE));
 263         sei();
 264
 265 #if DEBUG
 266         debug("\n=========================<  (RE)START DEBUG  >=========================\n");
 267         print_reset_reason();
 268 #endif
 269
 270         i2c_init(CONFIG_SYS_I2C_CLOCK);
 271         setup_system_time();
 272         setup_fatfs();
 273
 274         printf_P(PSTR("\n" MCU_STRING "+Z8S180 Stamp Monitor - Version: " VERSION  " \n\n"));
 275
 276         setup_z180_serv();
 277
 278         main_loop();
 279 }