Hi,
I'm currently running two separate TWI-instances on my nRF52 DK with SDK 11.
Each instance runs quite well with no issue, except for when instance 1 becomes active (it either reads or writes); the SDA-line on instance 0 becomes permanently low.
For clarity, I'm wondering why the SDA-line on TWI-instance 0 is going permanently low after the TWI-instance 1 has performed a read/write operation.
I have a Saleae 16 logic analyzer at hand, if needed, I can provide with some captures.
Here is my code for TWI-instance 0:
static const nrf_drv_twi_t twi_motor = NRF_DRV_TWI_INSTANCE(0);
const nrf_drv_twi_config_t twi_motor_config = {
.scl = SCL_MOTOR_PIN, // SCL_MOTOR_PIN = 27
.sda = SDA_MOTOR_PIN, // SDA_MOTOR_PIN = 26
.frequency = NRF_TWI_FREQ_100K,
.interrupt_priority = TWI0_CONFIG_IRQ_PRIORITY
};
nrf_drv_twi_init(&twi_motor, &twi_motor_config, NULL, NULL);
nrf_drv_twi_enable(&twi_motor);
Here is my code for TWI-instance 1:
static const nrf_drv_twi_t twi_rfid = NRF_DRV_TWI_INSTANCE(1);
const nrf_drv_twi_config_t twi_rfid_config = {
.scl = SCL_RFID_PIN, //SCL_RFID_PIN = 25
.sda = SDA_RFID_PIN, //SDA_RFID_PIN = 24
.frequency = NRF_TWI_FREQ_100K,
.interrupt_priority = TWI1_CONFIG_IRQ_PRIORITY
};
nrf_drv_twi_init(&twi_rfid, &twi_rfid_config, NULL, NULL);
nrf_drv_twi_enable(&twi_rfid);
Here is my configuration in nrf_drv_config.h:
#define TWI0_ENABLED 1
#if (TWI0_ENABLED == 1)
#define TWI0_USE_EASY_DMA 0
#define TWI0_CONFIG_FREQUENCY NRF_TWI_FREQ_100K
#define TWI0_CONFIG_SCL 0x1b
#define TWI0_CONFIG_SDA 0x1a
#define TWI0_CONFIG_IRQ_PRIORITY 1
#define TWI0_INSTANCE_INDEX 0
#endif
#define TWI1_ENABLED 1
#if (TWI1_ENABLED == 1)
#define TWI1_USE_EASY_DMA 0
#define TWI1_CONFIG_FREQUENCY NRF_TWI_FREQ_100K
#define TWI1_CONFIG_SCL 0x19
#define TWI1_CONFIG_SDA 0x18
#define TWI1_CONFIG_IRQ_PRIORITY 3
#define TWI1_INSTANCE_INDEX (TWI0_ENABLED)
#endif
#define TWI_COUNT (TWI0_ENABLED + TWI1_ENABLED)
