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Fixed delay for I2C and SPI 

Fixed delay for I2C - gone wrong in c91dbb5
Fixed delay for SPI, limited Software-SPI Speed to 250kbps, more is
possible but jitter makes the pulses too short without additional delay.
This commit is contained in:
BjoernSch 2016-08-06 12:53:23 +02:00
parent c91dbb5220
commit bcc77be5fb
2 changed files with 10 additions and 4 deletions
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4
pigpio.c
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@ -10044,7 +10044,7 @@ int bbI2COpen(unsigned SDA, unsigned SCL, unsigned baud)
wfRx[SDA].I.started = 0;
wfRx[SDA].I.SDA = SDA;
wfRx[SDA].I.SCL = SCL;
wfRx[SDA].I.delay = (500000 / baud) - 1;
wfRx[SDA].I.delay = 500000 / baud;
wfRx[SDA].I.SDAMode = gpioGetMode(SDA);
wfRx[SDA].I.SCLMode = gpioGetMode(SCL);
@ -10109,7 +10109,7 @@ int bbSPIOpen(unsigned CS, unsigned MISO, unsigned MOSI, unsigned SCLK, unsigned
wfRx[CS].S.MOSI = MOSI;
wfRx[CS].S.CS = CS;
wfRx[CS].S.SCLK = SCLK;
wfRx[CS].S.delay = 500000 / baud;
wfRx[CS].S.delay = (500000 / baud) - 1;
wfRx[CS].S.spiFlags = spiFlags;
wfRx[CS].S.MISOMode = gpioGetMode(MISO);
wfRx[CS].S.MOSIMode = gpioGetMode(MOSI);

10
pigpio.h
View File

@ -597,7 +597,7 @@ typedef void *(gpioThreadFunc_t) (void *);
#define PI_BB_I2C_MAX_BAUD 500000
#define PI_BB_SPI_MIN_BAUD 50
#define PI_BB_SPI_MAX_BAUD 500000
#define PI_BB_SPI_MAX_BAUD 250000
#define PI_BB_SER_MIN_BAUD 50
#define PI_BB_SER_MAX_BAUD 250000
@ -2640,7 +2640,7 @@ for the hardware SPI ports.
MISO: 0-31
MOSI: 0-31
SCLK: 0-31
baud: 50-500000
baud: 50-250000
spiFlags: see below
. .
spiFlags consists of the least significant 22 bits.
@ -2662,6 +2662,12 @@ Mode POL PHA
p0 is 0 if CEx is active low (default) and 1 for active high.
T is 1 if the least significant bit is transmitted on MOSI first, the
default (0) shifts the most significant bit out first.
R is 1 if the least significant bit is received on MISO first, the
default (0) receives the most significant bit first.
The other bits in flags should be set to zero.
Returns 0 if OK, otherwise PI_BAD_USER_GPIO, PI_BAD_SPI_BAUD, or