Hello,
I've got a simple humidity/temperature sensor I am using, just to test out TWI on the PCA10040 Dev Kit.
When I wire up the sensor to the default SDA and SDCLK pins, I get the expected, "TWI device detected at address 0x60"
But when I change the default config from:
const nrf_drv_twi_config_t twi_config = {
.scl = ARDUINO_SCL_PIN,
.sda = ARDUINO_SDA_PIN,
.frequency = NRF_DRV_TWI_FREQ_100K,
.interrupt_priority = APP_IRQ_PRIORITY_HIGH,
.clear_bus_init = false
};
To:
const nrf_drv_twi_config_t twi_config = {
.scl = 8,
.sda = 6,
.frequency = NRF_DRV_TWI_FREQ_100K,
.interrupt_priority = APP_IRQ_PRIORITY_HIGH,
.clear_bus_init = false
};
I don't get a "TWI device detected at address 0x60" response.
But I also don't get a "No device was found." response.
So essentially, the first loop of:
nrf_drv_twi_rx(&m_twi, address, &sample_data, sizeof(sample_data))
returns an NRF_SUCCESS then doesn't log the "TWI device detected at address..." , even though the address of the sensor is 0x60, not 1.
Another weird thing is that if I use the same gpio pins that previously didn't recognize the sensor,
but simply flip the SDA and SDCLK pins like this:
const nrf_drv_twi_config_t twi_config = {
.scl = 6,
.sda = 8,
.frequency = NRF_DRV_TWI_FREQ_100K,
.interrupt_priority = APP_IRQ_PRIORITY_HIGH,
.clear_bus_init = false
};
It again works as expected, returning "TWI device detected at address 0x60".
So my question is,
why does this work:
const nrf_drv_twi_config_t twi_config = {
.scl = 6,
.sda = 8,
.frequency = NRF_DRV_TWI_FREQ_100K,
.interrupt_priority = APP_IRQ_PRIORITY_HIGH,
.clear_bus_init = false
};
but not this:
const nrf_drv_twi_config_t twi_config = {
.scl = 8,
.sda = 6,
.frequency = NRF_DRV_TWI_FREQ_100K,
.interrupt_priority = APP_IRQ_PRIORITY_HIGH,
.clear_bus_init = false
};
I don't see how this would conflict with any PCA10040 defaults
