david gauchard
77451d6ec9
Hardware SPI BREAKING: unswap mode 2 and 3 for portability ( #5948 )
...
* Hardware SPI BREAKING: unswap mode 2 and 3 for portability
use SPI.restoreEsp8266LegacyMode2And3() for former behaviour
2019-04-06 01:13:09 +02:00
Earle F. Philhower, III
8c01516f8a
Allow unaligned input/output to SPI::transferBytes ( #5709 )
...
* Allow unaligned input/output to SPI::transferBytes
Fixes #4967
Support any alignment of input and output pointers and transfer lengths
in SPI::transferBytes. Use 32-bit transfers and FIFO as much as
possible.
* Refactor misaligned transfer, avoid RMW to FIFO
The SPI FIFO can't properly do RMW (i.e. bytewise updates) because when
you read the FIFO you are actually reading the SPI read data, not what
was written into the write FIFO.
Refactor the transferBytes to take account of this. For aligned input
and outputs, perform as before (but handle non-x4 sizes properly). For
misaligned inputs, if it's unidirectional then do bytewise until the
direction data pointer is aligned and then do 32b accesses. Fod
bidirectional and misaligned inputs, copy the output data to an aligned
buffer, do the transfer, then copy the read back data from temp aligned
buffer to the real input buffer.
* Fix comments, clean condition checks, save stack
Add more comments and adjust naming to be more informative in
transferBytes_ and *aligned_. Save 64bytes of stack in double
misaligned case.
* Optimize misaligned transfers, reduce code size
On any misaligned input or output, always use a temp buffer. No need
for special casing and bytewise ::transfer(). This should be faster as
bytewise ::transfer involves a significant number of IO register
accesses and setup. Thanks to @devyte for the suggestion.
2019-02-03 12:17:06 -03:00
david gauchard
3cc12b1e08
arduino API's SPI::transfer(void*, size) (optimized) ( #4925 )
...
* SPI::transfer(void*, size) (optimized)
* spi: transfer(): fix checking size
* spi: transferBytes_: 32bits miso transfer
* spi: transferBytes_: fix declaration
* spi: transferBytes: add comments, reduce diff
2018-07-27 10:44:02 -04:00
david gauchard
559cb35025
spi: use const for output buffers ( #4552 )
2018-03-23 13:39:20 -03:00
Richard Allen
40c159fcf5
Remove a number of extui instructions
...
Using a uint8_t for the loop counter resulted
in a number of 8-bit extract (extui) instructions.
Using a uint32_t prevents this.
2017-06-06 23:23:09 -05:00
Richard Allen
00815f2db4
Manually manage FIFO volatility
...
Replace volatile with properly placed __sync_synchronize
SPI1W0 is volatile, but when writing multiple words
to the FIFO (which is really just a piece of SRAM),
we don't need to worry about write ordering. We only
need worry about write ordering such that all FIFO
words are written completely before HSPI is told to
use FIFO by setting SPI1CMD |= SPIBUSY;
2017-06-06 23:23:09 -05:00
Richard Allen
c07c8dc88e
Small cleanup to SPI write16 and write32 for big-endian
...
Merge a common line.
2017-06-06 23:23:09 -05:00
jpmendoza
af0f5ed956
Issue #1062 : Implement support for HSPI overlap mode.
2017-05-08 03:04:11 -05:00
Clemens Kirchgatterer
18297458be
allows global object instances be switch off with defines ( #2344 )
2016-08-01 11:21:50 +08:00
WereCatf
8ffe1aa2e2
Speed up writePattern() a bit more
2016-04-18 01:26:03 +03:00
WereCatf
a64a694f6d
Speed up SPI.writePattern()
2016-04-16 20:02:06 +03:00
Marco
bda212552c
Fix SPI.transfer16() using wrong endianness
2016-04-04 22:10:36 -07:00
reiyawea
66b68d4ada
add CPOL setting
2016-03-16 17:28:24 +08:00
John Doe
6ab3c76e03
register and clock changes
2015-06-02 00:11:20 +03:00
Markus Sattler
2eea25873d
fix SPI speed calculation @160Mhz Clock
2015-05-15 13:42:30 +02:00
Markus Sattler
e0c1b47937
add some notes to the SPI functions (aligned to 32Bit)
...
- Fatal exception (9)
2015-05-13 19:03:21 +02:00
Markus Sattler
27f45a205a
SD:
...
- optimize SPI usage 148% write speed (24kB/s -> 37kB/s) and 127% read speed (121kB/s -> 155kB/s) at 8MHz
- add clock frequency as parameter for begin(csPin, frequency)
- SD @80MHz write: 84kB/s read: 231kB/s
SPI add functions:
- void write32(uint32_t data);
- void write32(uint32_t data, bool msb);
- void transferBytes(uint8_t * out, uint8_t * in, uint32_t size);
Adafruit_ILI9341:
- code clean
2015-05-10 17:34:16 +02:00
Markus Sattler
070f2b3a14
many speed optimizations in Adafruit_ILI9341 lib (3x times faster)
...
add new SPI function:
void write(uint8_t data);
void write16(uint16_t data);
void write16(uint16_t data, bool msb);
void writeBytes(uint8_t * data, uint32_t size);
void writePattern(uint8_t * data, uint8_t size, uint32_t repeat);
Adafruit_ILI9341:
| Benchmark | Old (ms) | New (ms) | Speedup |
| ------------------------- | -------- | -------- | ----------- |
| Screen fill | 1248369 | 278707 | +347,91% |
| Text | 86102 | 53785 | +60,09% |
| Lines | 825400 | 536374 | +53,89% |
| Horiz/Vert Lines | 101875 | 24653 | +313,24% |
| Rectangles (outline) | 65720 | 17295 | +279,99% |
| Rectangles (filled) | 2592250 | 579157 | +347,59% |
| Circles (filled) | 411475 | 179454 | +129,29% |
| Circles (outline) | 360002 | 233584 | +54,12% |
| Triangles (outline) | 261772 | 170118 | +53,88% |
| Triangles (filled) | 866951 | 246237 | +252,08% |
| Rounded rects (outline) | 154131 | 81570 | +88,96% |
| Rounded rects (filled) | 2828112 | 660983 | +327,86% |
| | | | |
| Total | 9802159 | 3061917 | +220,13% |
2015-05-09 16:19:32 +02:00
Markus Sattler
dcc899a1b5
some speed optimizations
2015-05-08 15:33:48 +02:00
Markus Sattler
7c33efc3d8
fix SPI run on system clock
2015-05-08 15:30:27 +02:00
Markus Sattler
d7a88c3ea3
use a function to calculate best match clock register for SPI
...
TEST:
Frequency: 1000000 -> [0x009C1001] EQU: 0 Pre: 39 N: 1 H: 0 L: 1 - Back Calculated Frequency: 1000000
Frequency: 4000000 -> [0x00001001] EQU: 0 Pre: 0 N: 1 H: 0 L: 1 - Back Calculated Frequency: 40000000
Frequency: 2000000 -> [0x00041001] EQU: 0 Pre: 1 N: 1 H: 0 L: 1 - Back Calculated Frequency: 20000000
Frequency: 1600000 -> [0x00004002] EQU: 0 Pre: 0 N: 4 H: 0 L: 2 - Back Calculated Frequency: 16000000
Frequency: 1610000 -> [0x00004002] EQU: 0 Pre: 0 N: 4 H: 0 L: 2 - Back Calculated Frequency: 16000000
Frequency: 1000000 -> [0x000C1001] EQU: 0 Pre: 3 N: 1 H: 0 L: 1 - Back Calculated Frequency: 10000000
Frequency: 8000000 -> [0x00101001] EQU: 0 Pre: 4 N: 1 H: 0 L: 1 - Back Calculated Frequency: 8000000
Frequency: 5000000 -> [0x001C1001] EQU: 0 Pre: 7 N: 1 H: 0 L: 1 - Back Calculated Frequency: 5000000
Frequency: 4000000 -> [0x00241001] EQU: 0 Pre: 9 N: 1 H: 0 L: 1 - Back Calculated Frequency: 4000000
Frequency: 2000000 -> [0x004C1001] EQU: 0 Pre: 19 N: 1 H: 0 L: 1 - Back Calculated Frequency: 2000000
Frequency: 1000000 -> [0x009C1001] EQU: 0 Pre: 39 N: 1 H: 0 L: 1 - Back Calculated Frequency: 1000000
Frequency: 500000 -> [0x013C1001] EQU: 0 Pre: 79 N: 1 H: 0 L: 1 - Back Calculated Frequency: 500000
Frequency: 250000 -> [0x027C1001] EQU: 0 Pre: 159 N: 1 H: 0 L: 1 - Back Calculated Frequency: 250000
Frequency: 125000 -> [0x04FC1001] EQU: 0 Pre: 319 N: 1 H: 0 L: 1 - Back Calculated Frequency: 125000
Frequency: 6666666 -> [0x00141001] EQU: 0 Pre: 5 N: 1 H: 0 L: 1 - Back Calculated Frequency: 6666666
Frequency: 6000000 -> [0x00181001] EQU: 0 Pre: 6 N: 1 H: 0 L: 1 - Back Calculated Frequency: 5714285
Frequency: 3000000 -> [0x00202001] EQU: 0 Pre: 8 N: 2 H: 0 L: 1 - Back Calculated Frequency: 2962962
Frequency: 100 -> [0x7FFFF020] EQU: 0 Pre: 8191 N: 63 H: 0 L: 32 - Back Calculated Frequency: 152
Frequency: 125000 -> [0x04FC1001] EQU: 0 Pre: 319 N: 1 H: 0 L: 1 - Back Calculated Frequency: 125000
Frequency: 16457 -> [0x25F81001] EQU: 0 Pre: 2430 N: 1 H: 0 L: 1 - Back Calculated Frequency: 16454
2015-05-08 00:48:08 +02:00
Markus Sattler
7f4a10062b
update README
...
add some docu and todo
2015-05-07 20:48:59 +02:00
Markus Sattler
ee5def9c8c
add CPHA support for SPI
...
- tested with logic analyzer
2015-05-07 19:48:55 +02:00
Markus Sattler
163858dc44
fix use SPI.beginTransaction crash
2015-05-07 19:25:25 +02:00
Markus Sattler
6599a9f52a
add SPIClass::transfer16 (needed by some display libs)
2015-05-04 18:11:46 +02:00
ficeto
fbec557ddb
Importing my changes
2015-04-30 20:48:50 +03:00
Ivan Grokhotkov
dfbc499627
Fix slashes in SPI library
2015-04-03 08:18:23 +03:00
Andrey Filimonov
4626a9df80
Initial ESP8266 HW SPI implementation
...
ILI9341 lib as a client for SPI lib
2015-04-01 07:10:31 +03:00
Ivan Grokhotkov
ee762f3150
Add WIP SPI library
2015-01-21 04:19:04 +03:00
