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 <stdlib.h>
  11 #include <stdio.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
  28 static uint8_t mcusr;
  29
  30 /*--------------------------------------------------------------------------*/
  31 #if DEBUG
  32
  33 __attribute__ ((naked)) __attribute__ ((section (".init3")))
  34 void preset_ram (void)
  35 {
  36         for (uint8_t *p = RAMSTART; p <= (uint8_t *) RAMEND; p++)
  37                 *p = 0xdd;
  38
  39 }
  40
  41 static const FLASH char * const FLASH rreasons[] = {
  42                         FSTR("Power on"),
  43                         FSTR("External"),
  44                         FSTR("Brown out"),
  45                         FSTR("Watchdog"),
  46                         FSTR("JTAG"),
  47                 };
  48
  49 static
  50 void print_reset_reason(void)
  51 {
  52         uint8_t r = mcusr & 0x1f;
  53         const FLASH char * const FLASH *p = rreasons;
  54
  55         printf_P(PSTR("### Reset reason(s): %s"), r ? "" : "none");
  56         for ( ; r; p++, r >>= 1) {
  57                 if (r & 1) {
  58                         my_puts_P(*p);
  59                         if (r & ~1)
  60                                 printf_P(PSTR(", "));
  61                 }
  62         }
  63         printf_P(PSTR(".\n"));
  64 }
  65
  66 #endif
  67
  68 ISR(INT5_vect)
  69 {
  70         Stat |= S_MSG_PENDING;
  71 }
  72
  73 ISR(INT6_vect)
  74 {
  75         Stat |= S_CON_PENDING;
  76 }
  77
  78 static
  79 void setup_avr(void)
  80 {
  81         /* save and clear reset reason(s) */
  82         /* TODO: move to init section? */
  83         mcusr = MCUSR;
  84         MCUSR = 0;
  85
  86         /* WD */
  87
  88         /* CPU */
  89
  90         /* Disable JTAG Interface regardless of the JTAGEN fuse setting. */
  91         MCUCR = _BV(JTD);
  92         MCUCR = _BV(JTD);
  93
  94         /* Disable peripherals. Enable individually in respective init function. */
  95         PRR0 = _BV(PRTWI) |
  96                 _BV(PRTIM2) | _BV(PRTIM0) | _BV(PRTIM1) |
  97                 _BV(PRSPI) | _BV(PRUSART0) | _BV(PRADC);
  98
  99         PRR1 = _BV(PRTIM5) | _BV(PRTIM4) | _BV(PRTIM3) |
 100                 _BV(PRUSART3) | _BV(PRUSART2) | _BV(PRUSART1);
 101
 102
 103         /* disable analog comparator */
 104         ACSR = _BV(ACD);
 105         /* Ports */
 106
 107         /* Clock */
 108         CLKPR = _BV(CLKPCE);
 109         CLKPR = 0;
 110
 111         /* Timer */
 112         PRR1 &= ~_BV(PRTIM3);
 113         OCR3A = F_CPU / 1000 - 1;       /* Timer3: 1000Hz interval (OC3A) */
 114         TCCR3B = (0b01<<WGM32)|(0b001<<CS30); /* CTC Mode, Prescaler 1 */
 115         TIMSK3 = _BV(OCIE3A);           /* Enable TC2.oca interrupt */
 116
 117         /* INT5, INT6: falling edge */
 118         EICRB = (EICRB & ~((0b11 << ISC50) | (0b11 << ISC60))) |
 119                 (0b10 << ISC50) | (0b10 << ISC60);
 120         /* Reset pending ints */
 121         EIFR |= _BV(INTF5) | _BV(INTF6);
 122         /* Enable INT5, and INT6 */
 123         EIMSK |= _BV(INT5) | _BV(INT6);
 124 }
 125
 126 static
 127 int reset_reason_is_power_on(void)
 128 {
 129         return (mcusr & _BV(PORF)) != 0;
 130 }
 131
 132 static
 133 void setup_system_time(void)
 134 {
 135         struct tm rtc_time;
 136
 137         rtc_get(&rtc_time);
 138         rtc_time.tm_isdst = 0;
 139         set_system_time(mk_gmtime(&rtc_time) );
 140 }
 141
 142
 143
 144 static void setup_fatfs(void)
 145 {
 146         static FATFS FatFs0;
 147         static FATFS FatFs1;
 148
 149         f_mount(&FatFs0, "0:", 0);
 150         f_mount(&FatFs1, "1:", 0);
 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(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 : PSTR("<UNDEFINED>"));
 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         for (int i = 0; i < GPIO_MAX; i++)
 252                 gpio_config(i, INPUT_PULLUP);
 253         setup_avr();
 254         setup_mmc();
 255         z80_setup_bus();
 256         env_init();
 257
 258         if (reset_reason_is_power_on())
 259                 _delay_ms(CONFIG_PWRON_DELAY);
 260
 261         serial_setup(getenv_ulong(PSTR(ENV_BAUDRATE), 10, CONFIG_BAUDRATE));
 262         sei();
 263
 264 #if DEBUG
 265         debug("\n=========================<  (RE)START DEBUG  >=========================\n");
 266         print_reset_reason();
 267 #endif
 268
 269         i2c_init(CONFIG_SYS_I2C_CLOCK);
 270         setup_system_time();
 271         setup_fatfs();
 272
 273         printf_P(PSTR("\nATMEGA1281+Z8S180 Stamp Monitor\n\n"));
 274
 275         setup_z180_serv();
 276
 277         main_loop();
 278 }