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1 | /* | |
2 | * This file is part of the sigrok-firmware-fx2lafw project. | |
3 | * | |
4 | * Copyright (C) 2011-2012 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include <eputils.h> | |
23 | #include <fx2regs.h> | |
24 | #include <fx2macros.h> | |
25 | #include <delay.h> | |
26 | #include <gpif.h> | |
27 | #include <fx2lafw.h> | |
28 | #include <gpif-acquisition.h> | |
29 | ||
30 | __bit gpif_acquiring; | |
31 | ||
32 | static void gpif_reset_waveforms(void) | |
33 | { | |
34 | int i; | |
35 | ||
36 | /* Reset WAVEDATA. */ | |
37 | AUTOPTRSETUP = 0x03; | |
38 | AUTOPTRH1 = 0xe4; | |
39 | AUTOPTRL1 = 0x00; | |
40 | for (i = 0; i < 128; i++) | |
41 | EXTAUTODAT1 = 0; | |
42 | } | |
43 | ||
44 | static void gpif_setup_registers(void) | |
45 | { | |
46 | /* TODO. Value probably irrelevant, as we don't use RDY* signals? */ | |
47 | GPIFREADYCFG = 0; | |
48 | ||
49 | /* Set TRICTL = 0, thus CTL0-CTL5 are CMOS outputs. */ | |
50 | GPIFCTLCFG = 0; | |
51 | ||
52 | /* When GPIF is idle, tri-state the data bus. */ | |
53 | /* Bit 7: DONE, bit 0: IDLEDRV. TODO: Set/clear DONE bit? */ | |
54 | GPIFIDLECS = (0 << 0); | |
55 | ||
56 | /* When GPIF is idle, set CTL0-CTL5 to 0. */ | |
57 | GPIFIDLECTL = 0; | |
58 | ||
59 | /* | |
60 | * Map index 0 in WAVEDATA to FIFORD. The rest is assigned too, | |
61 | * but not used by us. | |
62 | * | |
63 | * GPIFWFSELECT: [7:6] = SINGLEWR index, [5:4] = SINGLERD index, | |
64 | * [3:2] = FIFOWR index, [1:0] = FIFORD index | |
65 | */ | |
66 | GPIFWFSELECT = (0x3 << 6) | (0x2 << 4) | (0x1 << 2) | (0x0 << 0); | |
67 | ||
68 | /* Contains RDY* pin values. Read-only according to TRM. */ | |
69 | GPIFREADYSTAT = 0; | |
70 | ||
71 | /* Make GPIF stop on transaction count not flag. */ | |
72 | EP2GPIFPFSTOP = (0 << 0); | |
73 | } | |
74 | ||
75 | static void gpif_init_addr_pins(void) | |
76 | { | |
77 | /* | |
78 | * Configure the 9 GPIF address pins (GPIFADR[8:0], which consist of | |
79 | * PORTC[7:0] and PORTE[7]), and output an initial address (zero). | |
80 | * TODO: Probably irrelevant, the 56pin FX2 has no ports C and E. | |
81 | */ | |
82 | PORTCCFG = 0xff; /* Set PORTC[7:0] as alt. func. (GPIFADR[7:0]). */ | |
83 | OEC = 0xff; /* Configure PORTC[7:0] as outputs. */ | |
84 | PORTECFG |= 0x80; /* Set PORTE[7] as alt. func. (GPIFADR[8]). */ | |
85 | OEE |= 0x80; /* Configure PORTE[7] as output. */ | |
86 | SYNCDELAY(); | |
87 | GPIFADRL = 0x00; /* Clear GPIFADR[7:0]. */ | |
88 | SYNCDELAY(); | |
89 | GPIFADRH = 0x00; /* Clear GPIFADR[8]. */ | |
90 | } | |
91 | ||
92 | static void gpif_init_flowstates(void) | |
93 | { | |
94 | /* Clear all flowstate registers, we don't use this functionality. */ | |
95 | FLOWSTATE = 0; | |
96 | FLOWLOGIC = 0; | |
97 | FLOWEQ0CTL = 0; | |
98 | FLOWEQ1CTL = 0; | |
99 | FLOWHOLDOFF = 0; | |
100 | FLOWSTB = 0; | |
101 | FLOWSTBEDGE = 0; | |
102 | FLOWSTBHPERIOD = 0; | |
103 | } | |
104 | ||
105 | void gpif_init_la(void) | |
106 | { | |
107 | /* | |
108 | * Setup the FX2 in GPIF master mode, using the internal clock | |
109 | * (non-inverted) at 48MHz, and using async sampling. | |
110 | */ | |
111 | IFCONFIG = 0xee; | |
112 | ||
113 | /* Abort currently executing GPIF waveform (if any). */ | |
114 | GPIFABORT = 0xff; | |
115 | ||
116 | /* Setup the GPIF registers. */ | |
117 | gpif_setup_registers(); | |
118 | ||
119 | /* Reset WAVEDATA. */ | |
120 | gpif_reset_waveforms(); | |
121 | ||
122 | /* Initialize GPIF address pins, output initial values. */ | |
123 | gpif_init_addr_pins(); | |
124 | ||
125 | /* Initialize flowstate registers (not used by us). */ | |
126 | gpif_init_flowstates(); | |
127 | ||
128 | /* Reset the status. */ | |
129 | gpif_acquiring = FALSE; | |
130 | } | |
131 | ||
132 | static void gpif_make_delay_state(volatile BYTE *pSTATE, uint8_t delay, uint8_t output) | |
133 | { | |
134 | /* | |
135 | * DELAY | |
136 | * Delay cmd->sample_delay clocks. | |
137 | */ | |
138 | pSTATE[0] = delay; | |
139 | ||
140 | /* | |
141 | * OPCODE | |
142 | * SGL=0, GIN=0, INCAD=0, NEXT=0, DATA=0, DP=0 | |
143 | */ | |
144 | pSTATE[8] = 0; | |
145 | ||
146 | /* | |
147 | * OUTPUT | |
148 | * CTL[0:5]=output | |
149 | */ | |
150 | pSTATE[16] = output; | |
151 | ||
152 | /* | |
153 | * LOGIC FUNCTION | |
154 | * Not used. | |
155 | */ | |
156 | pSTATE[24] = 0x00; | |
157 | } | |
158 | ||
159 | static void gpif_make_data_dp_state(volatile BYTE *pSTATE) | |
160 | { | |
161 | /* | |
162 | * BRANCH | |
163 | * Branch to IDLE if condition is true, back to S0 otherwise. | |
164 | */ | |
165 | pSTATE[0] = (7 << 3) | (0 << 0); | |
166 | ||
167 | /* | |
168 | * OPCODE | |
169 | * SGL=0, GIN=0, INCAD=0, NEXT=0, DATA=1, DP=1 | |
170 | */ | |
171 | pSTATE[8] = (1 << 1) | (1 << 0); | |
172 | ||
173 | /* | |
174 | * OUTPUT | |
175 | * CTL[0:5]=0 | |
176 | */ | |
177 | pSTATE[16] = 0x00; | |
178 | ||
179 | /* | |
180 | * LOGIC FUNCTION | |
181 | * Evaluate if the FIFO full flag is set. | |
182 | * LFUNC=0 (AND), TERMA=6 (FIFO Flag), TERMB=6 (FIFO Flag) | |
183 | */ | |
184 | pSTATE[24] = (6 << 3) | (6 << 0); | |
185 | } | |
186 | ||
187 | bool gpif_acquisition_start(const struct cmd_start_acquisition *cmd) | |
188 | { | |
189 | int i; | |
190 | volatile BYTE *pSTATE = &GPIF_WAVE_DATA; | |
191 | ||
192 | /* Ensure GPIF is idle before reconfiguration. */ | |
193 | while (!(GPIFTRIG & 0x80)); | |
194 | ||
195 | /* Configure the EP2 FIFO. */ | |
196 | if (cmd->flags & CMD_START_FLAGS_SAMPLE_16BIT) | |
197 | EP2FIFOCFG = bmAUTOIN | bmWORDWIDE; | |
198 | else | |
199 | EP2FIFOCFG = bmAUTOIN; | |
200 | SYNCDELAY(); | |
201 | ||
202 | /* Set IFCONFIG to the correct clock source. */ | |
203 | if (cmd->flags & CMD_START_FLAGS_CLK_48MHZ) { | |
204 | IFCONFIG = bmIFCLKSRC | bm3048MHZ | bmIFCLKOE | bmASYNC | | |
205 | bmGSTATE | bmIFGPIF; | |
206 | } else { | |
207 | IFCONFIG = bmIFCLKSRC | bmIFCLKOE | bmASYNC | | |
208 | bmGSTATE | bmIFGPIF; | |
209 | } | |
210 | ||
211 | /* Populate delay states. */ | |
212 | if ((cmd->sample_delay_h == 0 && cmd->sample_delay_l == 0) || | |
213 | cmd->sample_delay_h >= 6) | |
214 | return false; | |
215 | ||
216 | if (cmd->flags & CMD_START_FLAGS_CLK_CTL2) { | |
217 | uint8_t delay_1, delay_2 = cmd->sample_delay_l; | |
218 | ||
219 | /* We need a pulse where the CTL1/2 pins alternate states. */ | |
220 | if (cmd->sample_delay_h) { | |
221 | for (i = 0; i < cmd->sample_delay_h; i++) | |
222 | gpif_make_delay_state(pSTATE++, 0, 0x06); | |
223 | } else { | |
224 | delay_1 = delay_2 / 2; | |
225 | delay_2 -= delay_1; | |
226 | gpif_make_delay_state(pSTATE++, delay_1, 0x06); | |
227 | } | |
228 | ||
229 | /* sample_delay_l is always != 0 for the supported rates. */ | |
230 | gpif_make_delay_state(pSTATE++, delay_2, 0x00); | |
231 | } else { | |
232 | for (i = 0; i < cmd->sample_delay_h; i++) | |
233 | gpif_make_delay_state(pSTATE++, 0, 0x00); | |
234 | ||
235 | if (cmd->sample_delay_l != 0) | |
236 | gpif_make_delay_state(pSTATE++, cmd->sample_delay_l, 0x00); | |
237 | } | |
238 | ||
239 | /* Populate S1 - the decision point. */ | |
240 | gpif_make_data_dp_state(pSTATE++); | |
241 | ||
242 | /* Execute the whole GPIF waveform once. */ | |
243 | gpif_set_tc16(1); | |
244 | ||
245 | /* Perform the initial GPIF read. */ | |
246 | gpif_fifo_read(GPIF_EP2); | |
247 | ||
248 | /* Update the status. */ | |
249 | gpif_acquiring = TRUE; | |
250 | ||
251 | return true; | |
252 | } | |
253 | ||
254 | void gpif_poll(void) | |
255 | { | |
256 | /* Detect if acquisition has completed. */ | |
257 | if (gpif_acquiring && (GPIFTRIG & 0x80)) { | |
258 | /* Activate NAK-ALL to avoid race conditions. */ | |
259 | FIFORESET = 0x80; | |
260 | SYNCDELAY(); | |
261 | ||
262 | /* Switch to manual mode. */ | |
263 | EP2FIFOCFG = 0; | |
264 | SYNCDELAY(); | |
265 | ||
266 | /* Reset EP2. */ | |
267 | FIFORESET = 0x02; | |
268 | SYNCDELAY(); | |
269 | ||
270 | /* Return to auto mode. */ | |
271 | EP2FIFOCFG = bmAUTOIN; | |
272 | SYNCDELAY(); | |
273 | ||
274 | /* Release NAK-ALL. */ | |
275 | FIFORESET = 0x00; | |
276 | SYNCDELAY(); | |
277 | ||
278 | gpif_acquiring = FALSE; | |
279 | } | |
280 | } |