I have an si7055 i2c temperature sensor connected to an nRF52840
I've tried my best to get a reading, but failed.
Therefore given up.
I'd be grateful for some help to determine what I've done wrong please.
I've included the project in zipped form for board nrf52840dk.nrf52840
Unfortunately I do not have a logic analyzer.
I am running the code on SDK v1.4.2
I modified si7055.c which is why i2c master found is displayed in the following output. However I receive the same message if I change the address of the sensor in the overlay. I have checked that the correct address is recorded in zephyr.dts
I'd be grateful if you would check that the overlay included in the project is correctly recording:
SDA 24
SCL 25
si7055 address 0x40
Therefore I'm expecting that regardless of what the logic analyzer is showing you that the call to si7055_init will confirm that the sensor is present.
static int si7055_init(const struct device *dev)
{
struct si7055_data *drv_data = dev->data;
drv_data->i2c_dev = device_get_binding(
DT_INST_BUS_LABEL(0));
if (!drv_data->i2c_dev) {
LOG_ERR("i2c master not found.");
return -EINVAL;
} else {
printk("i2c master found\n");
}
LOG_DBG("si7055 init ok");
return 0;
}
i2c master found
*** Booting Zephyr OS build v2.4.0-ncs2 ***
[00:00:03.000,396] [1;31m<err> i2c_nrfx_twim: Error 195952641 occurred for message 0[0m
[00:00:03.000,427] [1;31m<err> si7055: read register err[0m
sample fetch error
[00:00:06.000,671] [1;31m<err> i2c_nrfx_twim: Error 195952641 occurred for message 0[0m
[00:00:06.000,671] [1;31m<err> si7055: read register err[0m
[
There seem to be a few issues with the sensor.h implementation as indicated in the following 2 links:
Unfortunately I do not have a logic analyzer.
I am running the code on SDK v1.4.2
I modified si7055.c which is why i2c master found is displayed in the following output. However I receive the same message if I change the address of the sensor in the overlay. I have checked that the correct address is recorded in zephyr.dts
I'd be grateful if you would check that the overlay included in the project is correctly recording:
SDA 24
SCL 25
si7055 address 0x40
Therefore I'm expecting that regardless of what the logic analyzer is showing you that the call to si7055_init will confirm that the sensor is present.
static int si7055_init(const struct device *dev)
{
struct si7055_data *drv_data = dev->data;
drv_data->i2c_dev = device_get_binding(
DT_INST_BUS_LABEL(0));
if (!drv_data->i2c_dev) {
LOG_ERR("i2c master not found.");
return -EINVAL;
} else {
printk("i2c master found\n");
}
LOG_DBG("si7055 init ok");
return 0;
}
i2c master found
*** Booting Zephyr OS build v2.4.0-ncs2 ***
[00:00:03.000,396] [1;31m<err> i2c_nrfx_twim: Error 195952641 occurred for message 0[0m
[00:00:03.000,427] [1;31m<err> si7055: read register err[0m
sample fetch error
[00:00:06.000,671] [1;31m<err> i2c_nrfx_twim: Error 195952641 occurred for message 0[0m
[00:00:06.000,671] [1;31m<err> si7055: read register err[0m
[
There seem to be a few issues with the sensor.h implementation as indicated in the following 2 links:
