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px4-firmware
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Remove spurious I2C clock frequency resets.

This commit is contained in:
px4dev 2012-08-24 08:18:18 -07:00
parent d12c09cc86
commit d55dd67d77
2 changed files with 7 additions and 8 deletions
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13
apps/drivers/device/i2c.cpp
View File

@ -73,11 +73,8 @@ I2C::init()
{
int ret = OK;
// attach to the i2c bus
/* attach to the i2c bus */
_dev = up_i2cinitialize(_bus);
// set the bus speed again to a reasonable number of 400 KHz
I2C_SETFREQUENCY(_dev, 400000);
if (_dev == nullptr) {
debug("failed to init I2C");
@ -147,8 +144,12 @@ I2C::transfer(uint8_t *send, unsigned send_len, uint8_t *recv, unsigned recv_len
if (msgs == 0)
return -EINVAL;
// set the bus speed again to a reasonable number of 400 KHz
I2C_SETFREQUENCY(_dev, 400000);
/*
* I2C architecture means there is an unavoidable race here
* if there are any devices on the bus with a different frequency
* preference. Really, this is pointless.
*/
I2C_SETFREQUENCY(_dev, _frequency);
ret = I2C_TRANSFER(_dev, &msgv[0], msgs);
if (ret == OK)

2
apps/system/i2c/i2c_bus.c
View File

@ -84,8 +84,6 @@ int i2ccmd_bus(FAR struct i2ctool_s *i2ctool, int argc, char **argv)
for (i = CONFIG_I2CTOOL_MINBUS; i <= CONFIG_I2CTOOL_MAXBUS; i++)
{
dev = up_i2cinitialize(i);
// set the bus speed again to a reasonable number of 400 KHz
I2C_SETFREQUENCY(_dev, 400000);
if (dev)
{
i2ctool_printf(i2ctool, "Bus %d: YES\n", i);