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Option to invert bit bang serial.

This commit is contained in:
Eric Sorton 2015-08-29 09:06:27 -04:00
parent 1622877088
commit 5cf0d63695
9 changed files with 179 additions and 1 deletions
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6
command.c
View File

@ -146,6 +146,7 @@ cmdInfo_t cmdInfo[]=
{PI_CMD_SLR, "SLR", 121, 6}, // gpioSerialRead
{PI_CMD_SLRC, "SLRC", 112, 0}, // gpioSerialReadClose
{PI_CMD_SLRO, "SLRO", 131, 0}, // gpioSerialReadOpen
{PI_CMD_SLRI, "SLRI", 121, 0}, // gpioSerialReadInvert
{PI_CMD_SPIC, "SPIC", 112, 0}, // spiClose
{PI_CMD_SPIO, "SPIO", 131, 2}, // spiOpen
@ -305,6 +306,7 @@ SERWB h byte Write byte to serial handle\n\
SLR g v Read bit bang serial data from gpio\n\
SLRC g Close gpio for bit bang serial data\n\
SLRO g baud bitlen | Open gpio for bit bang serial data\n\
SLRI g invert Invert serial logic (1 invert, 0 normal)\n\
SPIC h SPI close handle\n\
SPIO channel baud flags | SPI open channel at baud with flags\n\
SPIR h v SPI read bytes from handle\n\
@ -466,6 +468,8 @@ static errInfo_t errInfo[]=
{PI_CHAIN_NESTING , "chain counters nested too deeply"},
{PI_CHAIN_TOO_BIG , "chain is too long"},
{PI_DEPRECATED , "deprecated function removed"},
{PI_NOT_IN_SER_MODE , "gpio not opened for bit-bang serial"},
{PI_BAD_SER_INVERT , "bit-bang serial invert not 0 or 1"},
};
@ -662,7 +666,7 @@ int cmdParse(
break;
case 121: /* HC I2CRD I2CRR I2CRW I2CWB I2CWQ P PFS PRS
PWM S SERVO SLR W WDOG WRITE
PWM S SERVO SLR SLRI W WDOG WRITE
Two positive parameters.
*/

28
pigpio.3
View File

@ -2175,6 +2175,26 @@ For \fBdata_bits\fP 9-16 there will be two bytes per character.
.br
For \fBdata_bits\fP 17-32 there will be four bytes per character.
.IP "\fBint gpioSerialReadInvert(unsigned user_gpio, unsigned invert)\fP"
.IP "" 4
This function inverts the serial logic for bit bang reading of serial data.
.br
.br
.EX
user_gpio: 0-31, previously opened with \fBgpioSerialReadOpen\fP.
invert: 0-1, 1 invert , 0 normal.
.br
.EE
.br
.br
Returns 0 if OK, otherwise PI_NOT_IN_SER_MODE or PI_BAD_SER_INVERT.
.IP "\fBint gpioSerialReadClose(unsigned user_gpio)\fP"
.IP "" 4
This function closes a gpio for bit bang reading of serial data.
@ -7309,6 +7329,10 @@ A 16-bit word value.
#define PI_CMD_WVCHA 93
.br
.br
#define PI_CMD_SLRI 94
.br
.br
#define PI_CMD_NOIB 99
.br
@ -7565,6 +7589,10 @@ A 16-bit word value.
.br
#define PI_DEPRECATED -120 // deprecated function removed
.br
#define PI_NOT_IN_SER_MODE -121 // gpio not opened for bit-bang serial
.br
#define PI_BAD_SER_INVERT -122 // bit-bang serial invert not 0 or 1
.br
.br
#define PI_PIGIF_ERR_0 -2000

29
pigpio.c
View File

@ -1011,6 +1011,7 @@ typedef struct
int bytes; /* 1, 2, 4 */
int level;
int dataBits; /* 1-32 */
int invert; /* 0, 1 */
} wfRxSerial_t;
typedef struct
@ -1943,6 +1944,7 @@ static int myDoCommand(uint32_t *p, unsigned bufSize, char *buf)
memcpy(&p[4], buf, 4);
res = gpioSerialReadOpen(p[1], p[2], p[4]); break;
case PI_CMD_SLRI: res = gpioSerialReadInvert(p[1], p[2]); break;
case PI_CMD_SPIC: res = spiClose(p[1]); break;
@ -2696,6 +2698,8 @@ static void waveRxSerial(wfRx_t *w, int level, uint32_t tick)
int diffTicks, lastLevel;
int newWritePos;
level = level ^ w->s.invert;
if (w->s.bit >= 0)
{
diffTicks = tick - w->s.startBitTick;
@ -9311,6 +9315,7 @@ int gpioSerialReadOpen(unsigned gpio, unsigned baud, unsigned data_bits)
wfRx[gpio].s.writePos = 0;
wfRx[gpio].s.bit = -1;
wfRx[gpio].s.dataBits = data_bits;
wfRx[gpio].s.invert = PI_BB_SER_NORMAL;
if (data_bits < 9) wfRx[gpio].s.bytes = 1;
else if (data_bits < 17) wfRx[gpio].s.bytes = 2;
@ -9323,6 +9328,30 @@ int gpioSerialReadOpen(unsigned gpio, unsigned baud, unsigned data_bits)
/*-------------------------------------------------------------------------*/
int gpioSerialReadInvert(unsigned gpio, unsigned invert)
{
DBG(DBG_USER, "gpio=%d invert=%d", gpio, invert);
CHECK_INITED;
if (gpio > PI_MAX_USER_GPIO)
SOFT_ERROR(PI_BAD_USER_GPIO, "bad gpio (%d)", gpio);
if (wfRx[gpio].mode != PI_WFRX_SERIAL)
SOFT_ERROR(PI_NOT_IN_SER_MODE, "gpio %d is not in serial mode", gpio);
if ((invert < PI_BB_SER_NORMAL) ||
(invert > PI_BB_SER_INVERT))
SOFT_ERROR(PI_BAD_SER_INVERT,
"gpio %d, invert (%d)", gpio, invert);
wfRx[gpio].s.invert = invert;
return 0;
}
/*-------------------------------------------------------------------------*/
int gpioSerialRead(unsigned gpio, void *buf, size_t bufSize)
{
unsigned bytes=0, wpos;

28
pigpio.h
View File

@ -174,6 +174,7 @@ gpioNotifyPause Pause notifications
gpioNotifyClose Close a notification
gpioSerialReadOpen Opens a gpio for bit bang serial reads
gpioSerialReadInvert Configures normal/inverted for serial reads
gpioSerialRead Reads bit bang serial data from a gpio
gpioSerialReadClose Closes a gpio for bit bang serial reads
@ -549,6 +550,9 @@ typedef void *(gpioThreadFunc_t) (void *);
#define PI_BB_SER_MIN_BAUD 50
#define PI_BB_SER_MAX_BAUD 250000
#define PI_BB_SER_NORMAL 0
#define PI_BB_SER_INVERT 1
#define PI_WAVE_MIN_BAUD 50
#define PI_WAVE_MAX_BAUD 1000000
@ -1821,6 +1825,26 @@ It is the caller's responsibility to read data from the cyclic buffer
in a timely fashion.
D*/
/*F*/
int gpioSerialReadInvert(unsigned user_gpio, unsigned invert);
/*D
This function configures the level logci for bit bang serial reads.
Pass PI_BB_SER_INVERT to invert the serial logic. Pass PI_BB_SER_NORMAL for
normal logic. Default is PI_BB_SER_NORMAL.
. .
user_gpio: 0-31
invert: 0-1
. .
Returns 0 if OK, otherwise PI_BAD_USER_GPIO, PI_GPIO_IN_USE,
PI_NOT_IN_SER_MODE, or PI_BAD_SER_INVERT.
The gpio must be opened for bit bang reading of serial data using
[*gpioSerialReadOpen*] prior to calling this function.
D*/
/*F*/
int gpioSerialRead(unsigned user_gpio, void *buf, size_t bufSize);
@ -4581,6 +4605,8 @@ PARAMS*/
#define PI_CMD_WVCHA 93
#define PI_CMD_SLRI 94
#define PI_CMD_NOIB 99
/*DEF_E*/
@ -4766,6 +4792,8 @@ after this command is issued.
#define PI_CHAIN_NESTING -118 // chain counters nested too deeply
#define PI_CHAIN_TOO_BIG -119 // chain is too long
#define PI_DEPRECATED -120 // deprecated function removed
#define PI_NOT_IN_SER_MODE -121 // gpio not opened for bit-bang serial
#define PI_BAD_SER_INVERT -122 // bit-bang serial invert not 0 or 1
#define PI_PIGIF_ERR_0 -2000
#define PI_PIGIF_ERR_99 -2099

22
pigpio.py
View File

@ -151,6 +151,7 @@ notify_close Close a notification
bb_serial_read_open Open a gpio for bit bang serial reads
bb_serial_read Read bit bang serial data from a gpio
bb_serial_read_close Close a gpio for bit bang serial reads
bb_serial_invert Invert serial logic (1 invert, 0 normal)
hardware_clock Start hardware clock on supported gpios
hardware_PWM Start hardware PWM on supported gpios
@ -432,6 +433,8 @@ _PI_CMD_I2CZ =92
_PI_CMD_WVCHA=93
_PI_CMD_SLRI= 94
# pigpio error numbers
_PI_INIT_FAILED =-1
@ -555,6 +558,8 @@ PI_BAD_CHAIN_DELAY =-117
PI_CHAIN_NESTING =-118
PI_CHAIN_TOO_BIG =-119
PI_DEPRECATED =-120
PI_NOT_IN_SER_MODE =-121
PI_BAD_SER_INVERT =-122
# pigpio error text
@ -677,6 +682,8 @@ _errors=[
[PI_CHAIN_NESTING , "chain counters nested too deeply"],
[PI_CHAIN_TOO_BIG , "chain is too long"],
[PI_DEPRECATED , "deprecated function removed"],
[PI_NOT_IN_SER_MODE , "gpio not opened for bit-bang serial"],
[PI_BAD_SER_INVERT , "bit-bang serial invert not 0 or 1"],
]
@ -3324,6 +3331,19 @@ class pi():
"""
return _u2i(_pigpio_command(self.sl, _PI_CMD_SLRC, user_gpio, 0))
def bb_serial_invert(self, user_gpio, invert):
"""
Invert serial logic.
user_gpio:= 0-31 (opened in a prior call to [*bb_serial_read_open*])
invert:= 0-1 (1 invert, 0 normal)
...
status = pi.bb_serial_invert(17, 1)
...
"""
return _u2i(_pigpio_command(self.sl, _PI_CMD_SLRI, user_gpio, invert, 0))
def custom_1(self, arg1=0, arg2=0, argx=[]):
"""
Calls a pigpio function customised by the user.
@ -3718,6 +3738,8 @@ def xref():
PI_CHAIN_NESTING = -118
PI_CHAIN_TOO_BIG = -119
PI_DEPRECATED = -120
PI_NOT_IN_SER_MODE =-121
PI_BAD_SER_INVERT =-122
. .
frequency: 0-40000

20
pigpiod_if.3
View File

@ -2187,6 +2187,26 @@ user_gpio: 0-31, previously opened with \fBbb_serial_read_open\fP.
.br
Returns 0 if OK, otherwise PI_BAD_USER_GPIO, or PI_NOT_SERIAL_GPIO.
.IP "\fBint bb_serial_invert(unsigned user_gpio, unsigned invert)\fP"
.IP "" 4
This function inverts the serial logic for bit bang reading of serial data.
.br
.br
.EX
user_gpio: 0-31, previously opened with \fBbb_serial_read_open\fP.
invert: 0-1, 1 invert , 0 normal.
.br
.EE
.br
.br
Returns 0 if OK, otherwise PI_NOT_IN_SER_MODE or PI_BAD_SER_INVERT.
.IP "\fBint i2c_open(unsigned i2c_bus, unsigned i2c_addr, unsigned i2c_flags)\fP"
.IP "" 4
This returns a handle for the device at address i2c_addr on bus i2c_bus.

3
pigpiod_if.c
View File

@ -941,6 +941,9 @@ int bb_serial_read(unsigned user_gpio, void *buf, size_t bufSize)
int bb_serial_read_close(unsigned user_gpio)
{return pigpio_command(gPigCommand, PI_CMD_SLRC, user_gpio, 0, 1);}
int bb_serial_invert(unsigned user_gpio, unsigned invert)
{return pigpio_command(gPigCommand, PI_CMD_SLRI, user_gpio, invert, 1);}
int i2c_open(unsigned i2c_bus, unsigned i2c_addr, uint32_t i2c_flags)
{
gpioExtent_t ext[1];

14
pigpiod_if.h
View File

@ -161,6 +161,7 @@ notify_close Close a notification
bb_serial_read_open Opens a gpio for bit bang serial reads
bb_serial_read Reads bit bang serial data from a gpio
bb_serial_read_close Closes a gpio for bit bang serial reads
bb_serial_invert Invert serial logic (1 invert, 0 normal)
hardware_clock Start hardware clock on supported gpios
hardware_PWM Start hardware PWM on supported gpios
@ -1501,6 +1502,19 @@ user_gpio: 0-31, previously opened with [*bb_serial_read_open*].
Returns 0 if OK, otherwise PI_BAD_USER_GPIO, or PI_NOT_SERIAL_GPIO.
D*/
/*F*/
int bb_serial_invert(unsigned user_gpio, unsigned invert);
/*D
This function inverts serial logic for big bang serial reads.
. .
user_gpio: 0-31, previously opened with [*bb_serial_read_open*].
invert: 0-1, 1 invert, 0 normal.
. .
Returns 0 if OK, otherwise PI_NOT_IN_SER_MODE or PI_BAD_SER_INVERT.
D*/
/*F*/
int i2c_open(unsigned i2c_bus, unsigned i2c_addr, unsigned i2c_flags);
/*D

30
pigs.1
View File

@ -2612,6 +2612,36 @@ ERROR: gpio already in use
.br
.IP "\fBSLRI u i\fP - Invert serial logic for bit bang serial data"
.IP "" 4
.br
This command inverts the serial logic when reading bit bang serial data.
.br
Upon success nothing is returned. On error a negative status code
will be returned.
.br
The invert parameter is 1 for inverted signal, 0 for normal.
.br
\fBExample\fP
.br
.EX
$ pigs slri 17 1
.br
.br
$ pigs slri 17 0
.br
.EE
.br
.IP "\fBSPIC h\fP - SPI close handle"
.IP "" 4