From cb76f07d3153895e379f15f6ca388ef04c6384dc Mon Sep 17 00:00:00 2001 From: Andrew Tridgell Date: Thu, 28 Nov 2013 20:29:33 +1100 Subject: l3gd20: added I2C disable based on method from ST engineering support --- src/drivers/l3gd20/l3gd20.cpp | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/src/drivers/l3gd20/l3gd20.cpp b/src/drivers/l3gd20/l3gd20.cpp index 8f5674823..31e38fbd9 100644 --- a/src/drivers/l3gd20/l3gd20.cpp +++ b/src/drivers/l3gd20/l3gd20.cpp @@ -218,6 +218,11 @@ private: */ void reset(); + /** + * disable I2C on the chip + */ + void disable_i2c(); + /** * Static trampoline from the hrt_call context; because we don't have a * generic hrt wrapper yet. @@ -574,6 +579,7 @@ L3GD20::read_reg(unsigned reg) uint8_t cmd[2]; cmd[0] = reg | DIR_READ; + cmd[1] = 0; transfer(cmd, cmd, sizeof(cmd)); @@ -699,9 +705,19 @@ L3GD20::stop() hrt_cancel(&_call); } +void +L3GD20::disable_i2c(void) +{ + uint8_t a = read_reg(0x05); + write_reg(0x05, (0x20 | a)); +} + void L3GD20::reset() { + // ensure the chip doesn't interpret any other bus traffic as I2C + disable_i2c(); + /* set default configuration */ write_reg(ADDR_CTRL_REG1, REG1_POWER_NORMAL | REG1_Z_ENABLE | REG1_Y_ENABLE | REG1_X_ENABLE); write_reg(ADDR_CTRL_REG2, 0); /* disable high-pass filters */ @@ -753,6 +769,7 @@ L3GD20::measure() perf_begin(_sample_perf); /* fetch data from the sensor */ + memset(&raw_report, 0, sizeof(raw_report)); raw_report.cmd = ADDR_OUT_TEMP | DIR_READ | ADDR_INCREMENT; transfer((uint8_t *)&raw_report, (uint8_t *)&raw_report, sizeof(raw_report)); -- cgit v1.2.3