d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Always ignore the START and STOP bits whenever the control register is

Browse Source 
being overwritten, they are set only bits (cleared by hardware).

Disable the Acknowledge of the controller slave address.  The slave mode is
not supported.

Make sure the interrupt flag bit is being cleared as recommended, add a
delay() _after_ clear the interrupt bit.

Sponsored by:	Rubicon Communications, LLC (Netgate)
This commit is contained in:
loos 2017-06-20 18:38:51 +00:00
parent 8540be900f
commit a514510c05
1 changed files with 8 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
sys/dev/iicbus/twsi/twsi.c
View File

@ -114,6 +114,7 @@ twsi_control_clear(struct twsi_softc *sc, uint32_t mask)
uint32_t val;
val = TWSI_READ(sc, sc->reg_control);
val &= ~(TWSI_CONTROL_STOP | TWSI_CONTROL_START);
val &= ~mask;
TWSI_WRITE(sc, sc->reg_control, val);
}
@ -124,6 +125,7 @@ twsi_control_set(struct twsi_softc *sc, uint32_t mask)
uint32_t val;
val = TWSI_READ(sc, sc->reg_control);
val &= ~(TWSI_CONTROL_STOP | TWSI_CONTROL_START);
val |= mask;
TWSI_WRITE(sc, sc->reg_control, val);
}
@ -204,8 +206,8 @@ twsi_locked_start(device_t dev, struct twsi_softc *sc, int32_t mask,
}
TWSI_WRITE(sc, sc->reg_data, slave);
DELAY(1000);
twsi_clear_iflg(sc);
DELAY(1000);
if (twsi_poll_ctrl(sc, timeout, TWSI_CONTROL_IFLG)) {
debugf("timeout sending slave address\n");
@ -251,7 +253,7 @@ twsi_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr)
TWSI_WRITE(sc, sc->reg_soft_reset, 0x0);
DELAY(2000);
TWSI_WRITE(sc, sc->reg_baud_rate, param);
TWSI_WRITE(sc, sc->reg_control, TWSI_CONTROL_TWSIEN | TWSI_CONTROL_ACK);
TWSI_WRITE(sc, sc->reg_control, TWSI_CONTROL_TWSIEN);
DELAY(1000);
mtx_unlock(&sc->mutex);
@ -266,9 +268,10 @@ twsi_stop(device_t dev)
sc = device_get_softc(dev);
mtx_lock(&sc->mutex);
twsi_control_clear(sc, TWSI_CONTROL_ACK);
twsi_control_set(sc, TWSI_CONTROL_STOP);
DELAY(1000);
twsi_clear_iflg(sc);
DELAY(1000);
mtx_unlock(&sc->mutex);
return (IIC_NOERR);
@ -341,8 +344,8 @@ twsi_read(device_t dev, char *buf, int len, int *read, int last, int delay)
else
twsi_control_set(sc, TWSI_CONTROL_ACK);
DELAY (1000);
twsi_clear_iflg(sc);
DELAY(1000);
if (twsi_poll_ctrl(sc, delay, TWSI_CONTROL_IFLG)) {
debugf("timeout reading data\n");
@ -382,6 +385,7 @@ twsi_write(device_t dev, const char *buf, int len, int *sent, int timeout)
TWSI_WRITE(sc, sc->reg_data, *buf++);
twsi_clear_iflg(sc);
DELAY(1000);
if (twsi_poll_ctrl(sc, timeout, TWSI_CONTROL_IFLG)) {
debugf("timeout writing data\n");
rv = IIC_ETIMEOUT;