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1 | /* | |
2 | */ | |
3 | ||
4 | ||
5 | #include "common.h" | |
6 | ||
7 | #include <util/delay.h> | |
8 | #include <avr/interrupt.h> | |
9 | #include <stdlib.h> | |
10 | #include <stdio.h> | |
11 | ||
12 | #include "config.h" | |
13 | #include "debug.h" | |
14 | #include "z80-if.h" | |
15 | #include "i2c.h" | |
16 | #include "con-utils.h" | |
17 | #include "serial.h" | |
18 | #include "timer.h" | |
19 | #include "cli.h" | |
20 | #include "env.h" | |
21 | #include "z180-serv.h" | |
22 | ||
23 | #define udelay(n) _delay_us(n) | |
24 | ||
25 | static uint8_t mcusr; | |
26 | ||
27 | /*--------------------------------------------------------------------------*/ | |
28 | #if DEBUG | |
29 | ||
30 | __attribute__ ((naked)) __attribute__ ((section (".init3"))) | |
31 | void preset_ram (void) | |
32 | { | |
33 | for (uint8_t *p = RAMSTART; p <= (uint8_t *) RAMEND; p++) | |
34 | *p = 0xdd; | |
35 | ||
36 | } | |
37 | ||
38 | static const FLASH char * const FLASH rreasons[] = { | |
39 | FSTR("Power on"), | |
40 | FSTR("External"), | |
41 | FSTR("Brown out"), | |
42 | FSTR("Watchdog"), | |
43 | FSTR("JTAG"), | |
44 | }; | |
45 | ||
46 | static | |
47 | void print_reset_reason(void) | |
48 | { | |
49 | uint8_t r = mcusr & 0x1f; | |
50 | const FLASH char * const FLASH *p = rreasons; | |
51 | ||
52 | printf_P(PSTR("### Reset reason(s): %s"), r ? "" : "none"); | |
53 | for ( ; r; p++, r >>= 1) { | |
54 | if (r & 1) { | |
55 | my_puts_P(*p); | |
56 | if (r & ~1) | |
57 | printf_P(PSTR(", ")); | |
58 | } | |
59 | } | |
60 | printf_P(PSTR(".\n")); | |
61 | } | |
62 | ||
63 | #endif | |
64 | ||
65 | ISR(INT5_vect) | |
66 | { | |
67 | Stat |= S_MSG_PENDING; | |
68 | } | |
69 | ||
70 | ISR(INT6_vect) | |
71 | { | |
72 | Stat |= S_CON_PENDING; | |
73 | } | |
74 | ||
75 | static | |
76 | void setup_avr(void) | |
77 | { | |
78 | /* save and clear reset reason(s) */ | |
79 | /* TODO: move to init section? */ | |
80 | mcusr = MCUSR; | |
81 | MCUSR = 0; | |
82 | ||
83 | /* WD */ | |
84 | ||
85 | /* CPU */ | |
86 | ||
87 | /* Disable JTAG Interface regardless of the JTAGEN fuse setting. */ | |
88 | MCUCR = _BV(JTD); | |
89 | MCUCR = _BV(JTD); | |
90 | ||
91 | /* Disable peripherals. Enable individually in respective init function. */ | |
92 | PRR0 = _BV(PRTWI) | | |
93 | _BV(PRTIM2) | _BV(PRTIM0) | _BV(PRTIM1) | | |
94 | _BV(PRSPI) | _BV(PRUSART0) | _BV(PRADC); | |
95 | ||
96 | PRR1 = _BV(PRTIM5) | _BV(PRTIM4) | _BV(PRTIM3) | | |
97 | _BV(PRUSART3) | _BV(PRUSART2) | _BV(PRUSART1); | |
98 | ||
99 | ||
100 | /* disable analog comparator */ | |
101 | ACSR = _BV(ACD); | |
102 | /* Ports */ | |
103 | ||
104 | /* Clock */ | |
105 | CLKPR = _BV(CLKPCE); | |
106 | CLKPR = 0; | |
107 | ||
108 | /* Timer */ | |
109 | PRR1 &= ~_BV(PRTIM3); | |
110 | OCR3A = F_CPU / 1000 - 1; /* Timer3: 1000Hz interval (OC3A) */ | |
111 | TCCR3B = (0b01<<WGM32)|(0b001<<CS30); /* CTC Mode, Prescaler 1 */ | |
112 | TIMSK3 = _BV(OCIE3A); /* Enable TC2.oca interrupt */ | |
113 | ||
114 | /* INT5, INT6: falling edge */ | |
115 | EICRB = (EICRB & ~((0b11 << ISC50) | (0b11 << ISC60))) | | |
116 | (0b10 << ISC50) | (0b10 << ISC60); | |
117 | /* Reset pending ints */ | |
118 | EIFR |= _BV(INTF5) | _BV(INTF6); | |
119 | /* Enable INT5, and INT6 */ | |
120 | EIMSK |= _BV(INT5) | _BV(INT6); | |
121 | } | |
122 | ||
123 | static | |
124 | int reset_reason_is_power_on(void) | |
125 | { | |
126 | return (mcusr & _BV(PORF)) != 0; | |
127 | } | |
128 | ||
129 | /*--------------------------------------------------------------------------*/ | |
130 | ||
131 | /* Stored value of bootdelay, used by autoboot_command() */ | |
132 | static int stored_bootdelay; | |
133 | ||
134 | ||
135 | /*************************************************************************** | |
136 | * Watch for 'delay' seconds for autoboot stop. | |
137 | * returns: 0 - no key, allow autoboot | |
138 | * 1 - got key, abort | |
139 | */ | |
140 | ||
141 | static int abortboot(int bootdelay) | |
142 | { | |
143 | int abort = 0; | |
144 | uint32_t ts; | |
145 | ||
146 | if (bootdelay >= 0) | |
147 | printf_P(PSTR("Hit any key to stop autoboot: %2d "), bootdelay); | |
148 | ||
149 | #if defined CONFIG_ZERO_BOOTDELAY_CHECK | |
150 | /* | |
151 | * Check if key already pressed | |
152 | * Don't check if bootdelay < 0 | |
153 | */ | |
154 | if (bootdelay >= 0) { | |
155 | if (tstc()) { /* we got a key press */ | |
156 | (void) my_getchar(1); /* consume input */ | |
157 | my_puts_P(PSTR("\b\b\b 0")); | |
158 | abort = 1; /* don't auto boot */ | |
159 | } | |
160 | } | |
161 | #endif | |
162 | ||
163 | while ((bootdelay > 0) && (!abort)) { | |
164 | --bootdelay; | |
165 | /* delay 1000 ms */ | |
166 | ts = get_timer(0); | |
167 | do { | |
168 | if (tstc()) { /* we got a key press */ | |
169 | abort = 1; /* don't auto boot */ | |
170 | bootdelay = 0; /* no more delay */ | |
171 | break; | |
172 | } | |
173 | udelay(10000); | |
174 | } while (!abort && get_timer(ts) < 1000); | |
175 | ||
176 | printf_P(PSTR("\b\b\b%2d "), bootdelay); | |
177 | } | |
178 | ||
179 | putchar('\n'); | |
180 | ||
181 | return abort; | |
182 | } | |
183 | ||
184 | static | |
185 | const char *bootdelay_process(void) | |
186 | { | |
187 | char *s; | |
188 | int bootdelay; | |
189 | ||
190 | bootdelay = (int) getenv_ulong(PSTR(ENV_BOOTDELAY), 10, CONFIG_BOOTDELAY); | |
191 | ||
192 | ||
193 | debug("### main_loop entered: bootdelay=%d\n\n", bootdelay); | |
194 | _delay_ms(20); | |
195 | ||
196 | s = getenv(PSTR(ENV_BOOTCMD)); | |
197 | stored_bootdelay = bootdelay; | |
198 | return s; | |
199 | } | |
200 | ||
201 | static | |
202 | void autoboot_command(const char *s) | |
203 | { | |
204 | debug("### main_loop: bootcmd=\"%s\"\n", s ? s : PSTR("<UNDEFINED>")); | |
205 | _delay_ms(20); | |
206 | ||
207 | if (stored_bootdelay != -1 && s && !abortboot(stored_bootdelay)) { | |
208 | run_command_list(s, -1); | |
209 | } | |
210 | } | |
211 | ||
212 | ||
213 | static | |
214 | void main_loop(void) | |
215 | { | |
216 | const char *s; | |
217 | ||
218 | s = bootdelay_process(); | |
219 | autoboot_command(s); | |
220 | cli_loop(); | |
221 | } | |
222 | ||
223 | int main(void) | |
224 | { | |
225 | ||
226 | setup_avr(); | |
227 | z80_setup_bus(); | |
228 | ||
229 | env_init(); | |
230 | ||
231 | if (reset_reason_is_power_on()) | |
232 | _delay_ms(CONFIG_PWRON_DELAY); | |
233 | ||
234 | serial_setup(getenv_ulong(PSTR(ENV_BAUDRATE), 10, CONFIG_BAUDRATE)); | |
235 | sei(); | |
236 | ||
237 | #if DEBUG | |
238 | debug("\n=========================< (RE)START DEBUG >=========================\n"); | |
239 | print_reset_reason(); | |
240 | #endif | |
241 | ||
242 | #if DEBUG | |
243 | unsigned long i_speed = getenv_ulong(PSTR("i2c_clock"), 10, CONFIG_SYS_I2C_CLOCK); | |
244 | debug("### Setting I2C clock Frequency to %lu Hz.\n", i_speed); | |
245 | i2c_init(i_speed); | |
246 | #else | |
247 | i2c_init(CONFIG_SYS_I2C_CLOCK); | |
248 | #endif | |
249 | ||
250 | printf_P(PSTR("\nATMEGA1281+Z8S180 Stamp Monitor\n\n")); | |
251 | ||
252 | setup_z180_serv(); | |
253 | ||
254 | main_loop(); | |
255 | } |