I am having trouble with an application where the NRF52832 operates several devices as a TWI master. What is even stranger is that I have been working on this code for a while and only now does it seem to cause a problem - I don't know what I changed that caused the issue. This problem is reproducible across multiple boards and on a Rigado dev board, so I don't think it stems directly from hardware.
I initialize my TWI:
void twi_init (void)
{
ret_code_t err_code;
const nrf_drv_twi_config_t twi_config = {
.scl = 11,
.sda = 12,
.frequency = NRF_TWI_FREQ_400K,
.interrupt_priority = APP_IRQ_PRIORITY_HIGH,
.clear_bus_init = true
};
err_code = nrf_drv_twi_init(&m_twi, &twi_config, NULL, NULL);
APP_ERROR_CHECK(err_code);
nrf_drv_twi_enable(&m_twi);
}
And then call it to check the status of a smart battery...
uint8_t getPctCapacity(nrf_drv_twi_t m_twi)
{
uint8_t buf[1];
uint8_t msg[] = {GET_STATE_OF_CHARGE};
nrf_drv_twi_tx(&m_twi, BATT_ADR, msg, 1, true);
nrf_drv_twi_rx(&m_twi, BATT_ADR, buf, 1);
if (buf[0] > 100) buf[0] = 100;
return buf[0];
}
And I get stuck in a loop inside twi_transfer() at nrf_drv_twi.c.
Specifically, my debugger bounces between
(nrf_twi_event_check(p_twi, NRF_TWI_EVENT_RXDREADY))
and
(do_stop_check && nrf_twi_event_check(p_twi, NRF_TWI_EVENT_STOPPED))
Has anyone had any experience with this issue? I get the same results whether or not I am testing on a real board or a dev board with nothing connected to the I2C lines.
