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[/] [gecko3/] [trunk/] [GECKO3COM/] [gecko3com-fw/] [firmware/] [src/] [spi.c] - Blame information for rev 32

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/* -*- c++ -*- */
/*
 * Copyright 2004,2006 Free Software Foundation, Inc.
 *
 * This file is part of GNU Radio
 *
 * GNU Radio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3, or (at your option)
 * any later version.
 *
 * GNU Radio is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU Radio; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */
/************************************************************/
/** \file    spi.c
 *************************************************************
 *  \brief   SPI bus functions
 *
 *  \details Library to communicate with SPI devices
 *
 *  \author  GNU Radio guys
 */
 
#include "spi.h"
#include "debugprint.h"
 
#if 0
/*
static unsigned char
count_bits8 (unsigned char v)
{
  static unsigned char count4[16] = {
    0,  // 0
    1,  // 1
    1,  // 2
    2,  // 3
    1,  // 4
    2,  // 5
    2,  // 6
    3,  // 7
    1,  // 8
    2,  // 9
    2,  // a
    3,  // b
    2,  // c
    3,  // d
    3,  // e
    4   // f
  };
  return count4[v & 0xf] + count4[(v >> 4) & 0xf];
}
*/
#else
 
 /** \brief internal helper function to count the number of active (1) bits in a byte */
static unsigned char
count_bits8 (unsigned char v)
{
  unsigned char count = 0;
  if (v & (1 << 0)) count++;
  if (v & (1 << 1)) count++;
  if (v & (1 << 2)) count++;
  if (v & (1 << 3)) count++;
  if (v & (1 << 4)) count++;
  if (v & (1 << 5)) count++;
  if (v & (1 << 6)) count++;
  if (v & (1 << 7)) count++;
  return count;
}
#endif
 
 
static void
setup_enables (unsigned char enables)
{
  // Software eanbles are active high.
  // Hardware enables are active low.
 
  if(count_bits8(enables) > 1) {
    print_info("too many enables acitve\n");
    return;
  }
  else {
    enables &= bmSPI_CS_MASK;
    SPI_CS_PORT |= bmSPI_CS_MASK;   //disable all chipselect signals
    SPI_CS_PORT &= ~enables;
  }
}
 
/** \brief disables all devices on the SPI bus */
#define disable_all()   setup_enables (0)
 
void
init_spi (void)
{
  disable_all ();               /* disable all devs       */
  bitSPI_MOSI = 0;               /* idle state has CLK = 0 */
}
static void
write_byte_msb (unsigned char v);
 
static void
write_bytes_msb (const xdata unsigned char *buf, unsigned char len);
 
static void
read_bytes_msb (xdata unsigned char *buf, unsigned char len);
 
 
// returns non-zero if successful, else 0
unsigned char
spi_read (unsigned char header_hi, unsigned char header_lo,
          unsigned char enables, unsigned char format,
          xdata unsigned char *buf, unsigned char len)
{
  if (count_bits8 (enables) > 1)
    return 0;            // error, too many enables set
 
  setup_enables (enables);
  /*
  if (format & bmSPI_FMT_LSB){          // order: LSB
#if 1
    return 0;           // error, not implemented
#else
    switch (format & bmSPI_HEADER){
    case SPI_HEADER_0:
      break;
    case bmSPI_HEADER_1:
      write_byte_lsb (header_lo);
      break;
    case bmSPI_HEADER_2:
      write_byte_lsb (header_lo);
      write_byte_lsb (header_hi);
      break;
    default:
      return 0;         // error
    }
    if (len != 0)
      read_bytes_lsb (buf, len);
#endif
  }
 
  else {                // order: MSB
  */
    switch (format & bmSPI_HEADER){
    case bmSPI_HEADER_0:
      break;
    case bmSPI_HEADER_1:
      write_byte_msb (header_lo);
      break;
    case bmSPI_HEADER_2:
      write_byte_msb (header_hi);
      write_byte_msb (header_lo);
      break;
    default:
      return 0;          // error
    }
    if (len != 0)
      read_bytes_msb (buf, len);
    //}
 
  disable_all ();
  return 1;             // success
}
 
 
// returns non-zero if successful, else 0
unsigned char
spi_write (unsigned char header_hi, unsigned char header_lo,
           unsigned char enables, unsigned char format,
           const xdata unsigned char *buf, unsigned char len)
{
  setup_enables (enables);
 
  /*  if (format & bmSPI_FORMAT_LSB){           // order: LSB
#if 1
    return 0;           // error, not implemented
#else
    switch (format & bmSPI_HEADER){
    case bmSPI_HEADER_0:
      break;
    case bmSPI_HEADER_1:
      write_byte_lsb (header_lo);
      break;
    case bmSPI_HEADER_2:
      write_byte_lsb (header_lo);
      write_byte_lsb (header_hi);
      break;
    default:
      return 0;         // error
    }
    if (len != 0)
      write_bytes_lsb (buf, len);
#endif
  }
 
  else {                // order: MSB
  */
    switch (format & bmSPI_HEADER){
    case bmSPI_HEADER_0:
      break;
    case bmSPI_HEADER_1:
      write_byte_msb (header_lo);
      break;
    case bmSPI_HEADER_2:
      write_byte_msb (header_hi);
      write_byte_msb (header_lo);
      break;
    default:
      return 0;          // error
    }
    if (len != 0)
      write_bytes_msb (buf, len);
    //}
 
  disable_all ();
  return 1;             // success
}
 
// ----------------------------------------------------------------
 
static void
write_byte_msb (unsigned char v)
{
  v = (v << 1) | (v >> 7);      // rotate left (MSB into bottom bit)
  bitSPI_MOSI = v & 0x1;
  bitSPI_CLK = 1;
  bitSPI_CLK = 0;
 
  v = (v << 1) | (v >> 7);      // rotate left (MSB into bottom bit)
  bitSPI_MOSI = v & 0x1;
  bitSPI_CLK = 1;
  bitSPI_CLK = 0;
 
  v = (v << 1) | (v >> 7);      // rotate left (MSB into bottom bit)
  bitSPI_MOSI = v & 0x1;
  bitSPI_CLK = 1;
  bitSPI_CLK = 0;
 
  v = (v << 1) | (v >> 7);      // rotate left (MSB into bottom bit)
  bitSPI_MOSI = v & 0x1;
  bitSPI_CLK = 1;
  bitSPI_CLK = 0;
 
  v = (v << 1) | (v >> 7);      // rotate left (MSB into bottom bit)
  bitSPI_MOSI = v & 0x1;
  bitSPI_CLK = 1;
  bitSPI_CLK = 0;
 
  v = (v << 1) | (v >> 7);      // rotate left (MSB into bottom bit)
  bitSPI_MOSI = v & 0x1;
  bitSPI_CLK = 1;
  bitSPI_CLK = 0;
 
  v = (v << 1) | (v >> 7);      // rotate left (MSB into bottom bit)
  bitSPI_MOSI = v & 0x1;
  bitSPI_CLK = 1;
  bitSPI_CLK = 0;
 
  v = (v << 1) | (v >> 7);      // rotate left (MSB into bottom bit)
  bitSPI_MOSI = v & 0x1;
  bitSPI_CLK = 1;
  bitSPI_CLK = 0;
}
 
static void
write_bytes_msb (const xdata unsigned char *buf, unsigned char len)
{
  while (len-- != 0){
    write_byte_msb (*buf++);
  }
}
 
#if 0
/*
 * This is incorrectly compiled by SDCC 2.4.0
 */
/*static unsigned char
read_byte_msb (void)
{
  unsigned char v = 0;
 
  bitSPI_CLK = 1;
  v |= bitSPI_MISO;
  bitSPI_CLK = 0;
 
  v = v << 1;
  bitSPI_CLK = 1;
  v |= bitSPI_MISO;
  bitSPI_CLK = 0;
 
  v = v << 1;
  bitSPI_CLK = 1;
  v |= bitSPI_MISO;
  bitSPI_CLK = 0;
 
  v = v << 1;
  bitSPI_CLK = 1;
  v |= bitSPI_MISO;
  bitSPI_CLK = 0;
 
  v = v << 1;
  bitSPI_CLK = 1;
  v |= bitSPI_MISO;
  bitSPI_CLK = 0;
 
  v = v << 1;
  bitSPI_CLK = 1;
  v |= bitSPI_MISO;
  bitSPI_CLK = 0;
 
  v = v << 1;
  bitSPI_CLK = 1;
  v |= bitSPI_MISO;
  bitSPI_CLK = 0;
 
  v = v << 1;
  bitSPI_CLK = 1;
  v |= bitSPI_MISO;
  bitSPI_CLK = 0;
 
  return v;
  } */
#else
static unsigned char
read_byte_msb (void) _naked
{
  _asm
        clr     a
 
        setb    _bitSPI_CLK
        mov     c, _bitSPI_MISO
        rlc     a
        clr     _bitSPI_CLK
 
        setb    _bitSPI_CLK
        mov     c, _bitSPI_MISO
        rlc     a
        clr     _bitSPI_CLK
 
        setb    _bitSPI_CLK
        mov     c, _bitSPI_MISO
        rlc     a
        clr     _bitSPI_CLK
 
        setb    _bitSPI_CLK
        mov     c, _bitSPI_MISO
        rlc     a
        clr     _bitSPI_CLK
 
        setb    _bitSPI_CLK
        mov     c, _bitSPI_MISO
        rlc     a
        clr     _bitSPI_CLK
 
        setb    _bitSPI_CLK
        mov     c, _bitSPI_MISO
        rlc     a
        clr     _bitSPI_CLK
 
        setb    _bitSPI_CLK
        mov     c, _bitSPI_MISO
        rlc     a
        clr     _bitSPI_CLK
 
        setb    _bitSPI_CLK
        mov     c, _bitSPI_MISO
        rlc     a
        clr     _bitSPI_CLK
 
        mov     dpl,a
        ret
  _endasm;
}
#endif
 
static void
read_bytes_msb (xdata unsigned char *buf, unsigned char len)
{
  while (len-- != 0){
    *buf++ = read_byte_msb ();
  }
}
 

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[/] [gecko3/] [trunk/] [GECKO3COM/] [gecko3com-fw/] [firmware/] [src/] [spi.c] - Blame information for rev 32

Line No.	Rev	Author	Line
1	9	nussgipfel	`/* -- c++ -- */`
2			`/*`
3			`* Copyright 2004,2006 Free Software Foundation, Inc.`
4			`*`
5			`* This file is part of GNU Radio`
6			`*`
7			`* GNU Radio 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 3, or (at your option)`
10			`* any later version.`
11			`*`
12			`* GNU Radio 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 GNU Radio; see the file COPYING. If not, write to`
19			`* the Free Software Foundation, Inc., 51 Franklin Street,`
20			`* Boston, MA 02110-1301, USA.`
21			`*/`
22			`/************************************************************/`
23			`/** \file spi.c`
24			`*************************************************************`
25			`* \brief SPI bus functions`
26			`*`
27			`* \details Library to communicate with SPI devices`
28			`*`
29			`* \author GNU Radio guys`
30			`*/`
31
32			`#include "spi.h"`
33			`#include "debugprint.h"`
34
35			`#if 0`
36			`/*`
37			`static unsigned char`
38			`count_bits8 (unsigned char v)`
39			`{`
40			`static unsigned char count4[16] = {`
41			`0, // 0`
42			`1, // 1`
43			`1, // 2`
44			`2, // 3`
45			`1, // 4`
46			`2, // 5`
47			`2, // 6`
48			`3, // 7`
49			`1, // 8`
50			`2, // 9`
51			`2, // a`
52			`3, // b`
53			`2, // c`
54			`3, // d`
55			`3, // e`
56			`4 // f`
57			`};`
58			`return count4[v & 0xf] + count4[(v >> 4) & 0xf];`
59			`}`
60			`*/`
61			`#else`
62
63			`/** \brief internal helper function to count the number of active (1) bits in a byte */`
64			`static unsigned char`
65			`count_bits8 (unsigned char v)`
66			`{`
67			`unsigned char count = 0;`
68			`if (v & (1 << 0)) count++;`
69			`if (v & (1 << 1)) count++;`
70			`if (v & (1 << 2)) count++;`
71			`if (v & (1 << 3)) count++;`
72			`if (v & (1 << 4)) count++;`
73			`if (v & (1 << 5)) count++;`
74			`if (v & (1 << 6)) count++;`
75			`if (v & (1 << 7)) count++;`
76			`return count;`
77			`}`
78			`#endif`
79
80
81			`static void`
82			`setup_enables (unsigned char enables)`
83			`{`
84			`// Software eanbles are active high.`
85			`// Hardware enables are active low.`
86
87			`if(count_bits8(enables) > 1) {`
88			`print_info("too many enables acitve\n");`
89			`return;`
90			`}`
91			`else {`
92			`enables &= bmSPI_CS_MASK;`
93			`SPI_CS_PORT \|= bmSPI_CS_MASK; //disable all chipselect signals`
94			`SPI_CS_PORT &= ~enables;`
95			`}`
96			`}`
97
98	32	nussgipfel	`/** \brief disables all devices on the SPI bus */`
99	9	nussgipfel	`#define disable_all() setup_enables (0)`
100
101			`void`
102			`init_spi (void)`
103			`{`
104			`disable_all (); /* disable all devs */`
105			`bitSPI_MOSI = 0; /* idle state has CLK = 0 */`
106			`}`
107			`static void`
108			`write_byte_msb (unsigned char v);`
109
110			`static void`
111			`write_bytes_msb (const xdata unsigned char *buf, unsigned char len);`
112
113			`static void`
114			`read_bytes_msb (xdata unsigned char *buf, unsigned char len);`
115
116
117			`// returns non-zero if successful, else 0`
118			`unsigned char`
119			`spi_read (unsigned char header_hi, unsigned char header_lo,`
120			`unsigned char enables, unsigned char format,`
121			`xdata unsigned char *buf, unsigned char len)`
122			`{`
123			`if (count_bits8 (enables) > 1)`
124			`return 0; // error, too many enables set`
125
126			`setup_enables (enables);`
127			`/*`
128			`if (format & bmSPI_FMT_LSB){ // order: LSB`
129			`#if 1`
130			`return 0; // error, not implemented`
131			`#else`
132			`switch (format & bmSPI_HEADER){`
133			`case SPI_HEADER_0:`
134			`break;`
135			`case bmSPI_HEADER_1:`
136			`write_byte_lsb (header_lo);`
137			`break;`
138			`case bmSPI_HEADER_2:`
139			`write_byte_lsb (header_lo);`
140			`write_byte_lsb (header_hi);`
141			`break;`
142			`default:`
143			`return 0; // error`
144			`}`
145			`if (len != 0)`
146			`read_bytes_lsb (buf, len);`
147			`#endif`
148			`}`
149
150			`else { // order: MSB`
151			`*/`
152			`switch (format & bmSPI_HEADER){`
153			`case bmSPI_HEADER_0:`
154			`break;`
155			`case bmSPI_HEADER_1:`
156			`write_byte_msb (header_lo);`
157			`break;`
158			`case bmSPI_HEADER_2:`
159			`write_byte_msb (header_hi);`
160			`write_byte_msb (header_lo);`
161			`break;`
162			`default:`
163			`return 0; // error`
164			`}`
165			`if (len != 0)`
166			`read_bytes_msb (buf, len);`
167			`//}`
168
169			`disable_all ();`
170			`return 1; // success`
171			`}`
172
173
174			`// returns non-zero if successful, else 0`
175			`unsigned char`
176			`spi_write (unsigned char header_hi, unsigned char header_lo,`
177			`unsigned char enables, unsigned char format,`
178			`const xdata unsigned char *buf, unsigned char len)`
179			`{`
180			`setup_enables (enables);`
181
182			`/* if (format & bmSPI_FORMAT_LSB){ // order: LSB`
183			`#if 1`
184			`return 0; // error, not implemented`
185			`#else`
186			`switch (format & bmSPI_HEADER){`
187			`case bmSPI_HEADER_0:`
188			`break;`
189			`case bmSPI_HEADER_1:`
190			`write_byte_lsb (header_lo);`
191			`break;`
192			`case bmSPI_HEADER_2:`
193			`write_byte_lsb (header_lo);`
194			`write_byte_lsb (header_hi);`
195			`break;`
196			`default:`
197			`return 0; // error`
198			`}`
199			`if (len != 0)`
200			`write_bytes_lsb (buf, len);`
201			`#endif`
202			`}`
203
204			`else { // order: MSB`
205			`*/`
206			`switch (format & bmSPI_HEADER){`
207			`case bmSPI_HEADER_0:`
208			`break;`
209			`case bmSPI_HEADER_1:`
210			`write_byte_msb (header_lo);`
211			`break;`
212			`case bmSPI_HEADER_2:`
213			`write_byte_msb (header_hi);`
214			`write_byte_msb (header_lo);`
215			`break;`
216			`default:`
217			`return 0; // error`
218			`}`
219			`if (len != 0)`
220			`write_bytes_msb (buf, len);`
221			`//}`
222
223			`disable_all ();`
224			`return 1; // success`
225			`}`
226
227			`// ----------------------------------------------------------------`
228
229			`static void`
230			`write_byte_msb (unsigned char v)`
231			`{`
232			`v = (v << 1) \| (v >> 7); // rotate left (MSB into bottom bit)`
233			`bitSPI_MOSI = v & 0x1;`
234			`bitSPI_CLK = 1;`
235			`bitSPI_CLK = 0;`
236
237			`v = (v << 1) \| (v >> 7); // rotate left (MSB into bottom bit)`
238			`bitSPI_MOSI = v & 0x1;`
239			`bitSPI_CLK = 1;`
240			`bitSPI_CLK = 0;`
241
242			`v = (v << 1) \| (v >> 7); // rotate left (MSB into bottom bit)`
243			`bitSPI_MOSI = v & 0x1;`
244			`bitSPI_CLK = 1;`
245			`bitSPI_CLK = 0;`
246
247			`v = (v << 1) \| (v >> 7); // rotate left (MSB into bottom bit)`
248			`bitSPI_MOSI = v & 0x1;`
249			`bitSPI_CLK = 1;`
250			`bitSPI_CLK = 0;`
251
252			`v = (v << 1) \| (v >> 7); // rotate left (MSB into bottom bit)`
253			`bitSPI_MOSI = v & 0x1;`
254			`bitSPI_CLK = 1;`
255			`bitSPI_CLK = 0;`
256
257			`v = (v << 1) \| (v >> 7); // rotate left (MSB into bottom bit)`
258			`bitSPI_MOSI = v & 0x1;`
259			`bitSPI_CLK = 1;`
260			`bitSPI_CLK = 0;`
261
262			`v = (v << 1) \| (v >> 7); // rotate left (MSB into bottom bit)`
263			`bitSPI_MOSI = v & 0x1;`
264			`bitSPI_CLK = 1;`
265			`bitSPI_CLK = 0;`
266
267			`v = (v << 1) \| (v >> 7); // rotate left (MSB into bottom bit)`
268			`bitSPI_MOSI = v & 0x1;`
269			`bitSPI_CLK = 1;`
270			`bitSPI_CLK = 0;`
271			`}`
272
273			`static void`
274			`write_bytes_msb (const xdata unsigned char *buf, unsigned char len)`
275			`{`
276			`while (len-- != 0){`
277			`write_byte_msb (*buf++);`
278			`}`
279			`}`
280
281			`#if 0`
282			`/*`
283			`* This is incorrectly compiled by SDCC 2.4.0`
284			`*/`
285			`/*static unsigned char`
286			`read_byte_msb (void)`
287			`{`
288			`unsigned char v = 0;`
289
290			`bitSPI_CLK = 1;`
291			`v \|= bitSPI_MISO;`
292			`bitSPI_CLK = 0;`
293
294			`v = v << 1;`
295			`bitSPI_CLK = 1;`
296			`v \|= bitSPI_MISO;`
297			`bitSPI_CLK = 0;`
298
299			`v = v << 1;`
300			`bitSPI_CLK = 1;`
301			`v \|= bitSPI_MISO;`
302			`bitSPI_CLK = 0;`
303
304			`v = v << 1;`
305			`bitSPI_CLK = 1;`
306			`v \|= bitSPI_MISO;`
307			`bitSPI_CLK = 0;`
308
309			`v = v << 1;`
310			`bitSPI_CLK = 1;`
311			`v \|= bitSPI_MISO;`
312			`bitSPI_CLK = 0;`
313
314			`v = v << 1;`
315			`bitSPI_CLK = 1;`
316			`v \|= bitSPI_MISO;`
317			`bitSPI_CLK = 0;`
318
319			`v = v << 1;`
320			`bitSPI_CLK = 1;`
321			`v \|= bitSPI_MISO;`
322			`bitSPI_CLK = 0;`
323
324			`v = v << 1;`
325			`bitSPI_CLK = 1;`
326			`v \|= bitSPI_MISO;`
327			`bitSPI_CLK = 0;`
328
329			`return v;`
330			`} */`
331			`#else`
332			`static unsigned char`
333			`read_byte_msb (void) _naked`
334			`{`
335			`_asm`
336			`clr a`
337
338			`setb _bitSPI_CLK`
339			`mov c, _bitSPI_MISO`
340			`rlc a`
341			`clr _bitSPI_CLK`
342
343			`setb _bitSPI_CLK`
344			`mov c, _bitSPI_MISO`
345			`rlc a`
346			`clr _bitSPI_CLK`
347
348			`setb _bitSPI_CLK`
349			`mov c, _bitSPI_MISO`
350			`rlc a`
351			`clr _bitSPI_CLK`
352
353			`setb _bitSPI_CLK`
354			`mov c, _bitSPI_MISO`
355			`rlc a`
356			`clr _bitSPI_CLK`
357
358			`setb _bitSPI_CLK`
359			`mov c, _bitSPI_MISO`
360			`rlc a`
361			`clr _bitSPI_CLK`
362
363			`setb _bitSPI_CLK`
364			`mov c, _bitSPI_MISO`
365			`rlc a`
366			`clr _bitSPI_CLK`
367
368			`setb _bitSPI_CLK`
369			`mov c, _bitSPI_MISO`
370			`rlc a`
371			`clr _bitSPI_CLK`
372
373			`setb _bitSPI_CLK`
374			`mov c, _bitSPI_MISO`
375			`rlc a`
376			`clr _bitSPI_CLK`
377
378			`mov dpl,a`
379			`ret`
380			`_endasm;`
381			`}`
382			`#endif`
383
384			`static void`
385			`read_bytes_msb (xdata unsigned char *buf, unsigned char len)`
386			`{`
387			`while (len-- != 0){`
388			`*buf++ = read_byte_msb ();`
389			`}`
390			`}`
391