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