int i2c_stop(i2c_t *obj) { NRF_TWI_Type *twi = m_twi_instances[TWI_IDX(obj)]; uint32_t t0; // The current transfer may be suspended (if it is RX), so it must be // resumed before the STOP task is triggered. nrf_twi_task_trigger(twi, NRF_TWI_TASK_RESUME); nrf_twi_task_trigger(twi, NRF_TWI_TASK_STOP); t0 = ticker_read(get_us_ticker_data()); do { if (nrf_twi_event_check(twi, NRF_TWI_EVENT_STOPPED)) { return 0; } } while (((uint32_t)ticker_read(get_us_ticker_data()) - t0) < I2C_TIMEOUT_VALUE_US); return 1; }
bool sleep_manager_can_deep_sleep_test_check() { const uint32_t check_time_us = 2000; const ticker_data_t *const ticker = get_us_ticker_data(); uint32_t start = ticker_read(ticker); while ((ticker_read(ticker) - start) < check_time_us) { if (sleep_manager_can_deep_sleep()) { return true; } } return false; }
static uint8_t twi_byte_write(NRF_TWI_Type *twi, uint8_t data) { uint32_t t0; nrf_twi_event_clear(twi, NRF_TWI_EVENT_TXDSENT); nrf_twi_event_clear(twi, NRF_TWI_EVENT_ERROR); nrf_twi_txd_set(twi, data); t0 = ticker_read(get_us_ticker_data()); do { if (nrf_twi_event_check(twi, NRF_TWI_EVENT_TXDSENT)) { nrf_twi_event_clear(twi, NRF_TWI_EVENT_TXDSENT); return 1; // ACK received } if (nrf_twi_event_check(twi, NRF_TWI_EVENT_ERROR)) { nrf_twi_event_clear(twi, NRF_TWI_EVENT_ERROR); return 0; // some error occurred } } while (((uint32_t)ticker_read(get_us_ticker_data()) - t0) < I2C_TIMEOUT_VALUE_US); return 2; // timeout; }
void wait_us(int us) { const ticker_data_t *const ticker = get_us_ticker_data(); uint32_t start = ticker_read(ticker); if ((us >= 1000) && core_util_are_interrupts_enabled()) { // Use the RTOS to wait for millisecond delays if possible sleep_manager_lock_deep_sleep(); Thread::wait((uint32_t)us / 1000); sleep_manager_unlock_deep_sleep(); } // Use busy waiting for sub-millisecond delays, or for the whole // interval if interrupts are not enabled while ((ticker_read(ticker) - start) < (uint32_t)us); }
QspiStatus flash_wait_for(uint32_t time_us, Qspi &qspi) { uint8_t reg[QSPI_STATUS_REG_SIZE]; qspi_status_t ret; uint32_t curr_time; const ticker_data_t *const ticker = get_us_ticker_data(); const uint32_t start = ticker_read(ticker); memset(reg, 255, QSPI_STATUS_REG_SIZE); do { ret = read_register(STATUS_REG, reg, QSPI_STATUS_REG_SIZE, qspi); curr_time = ticker_read(ticker); } while (((reg[0] & STATUS_BIT_WIP) != 0) && ((curr_time - start) < time_us)); if (((reg[0] & STATUS_BIT_WIP) == 0) && (ret == QSPI_STATUS_OK)) { return sOK; } else if (ret != QSPI_STATUS_OK) { return sError; } else if ((curr_time - start) >= time_us) { return sTimeout; } return sUnknown; }
Timer::Timer() : _running(), _start(), _time(), _ticker_data(get_us_ticker_data()) { reset(); }
Timer::Timer() : _running(), _start(), _time(), _ticker_data(get_us_ticker_data()), _lock_deepsleep(true) { reset(); }
int i2c_write(i2c_t *obj, int address, const char *data, int length, int stop) { twi_info_t *twi_info = TWI_INFO(obj); bool timeout = false; uint32_t t0, t1; #if DEVICE_I2C_ASYNCH if (twi_info->active) { return I2C_ERROR_BUS_BUSY; } #endif twi_info->start_twi = false; NRF_TWI_Type *twi = m_twi_instances[TWI_IDX(obj)]; start_twi_write(twi, address); // Special case - transaction with no data. // It can be used to check if a slave acknowledges the address. if (length == 0) { nrf_twi_event_t event; if (stop) { event = NRF_TWI_EVENT_STOPPED; nrf_twi_task_trigger(twi, NRF_TWI_TASK_STOP); } else { event = NRF_TWI_EVENT_SUSPENDED; nrf_twi_event_clear(twi, event); nrf_twi_task_trigger(twi, NRF_TWI_TASK_SUSPEND); } t0 = ticker_read(get_us_ticker_data()); do { if (nrf_twi_event_check(twi, event)) { break; } t1 = ticker_read(get_us_ticker_data()); timeout = (t1 - t0) >= I2C_TIMEOUT_VALUE_US; } while (!timeout); uint32_t errorsrc = nrf_twi_errorsrc_get_and_clear(twi); if (errorsrc & NRF_TWI_ERROR_ADDRESS_NACK) { if (!stop) { i2c_stop(obj); } return I2C_ERROR_NO_SLAVE; } return (timeout ? I2C_ERROR_BUS_BUSY : 0); } int result = length; do { uint8_t byte_write_result = twi_byte_write(twi, (uint8_t)*data++); if (byte_write_result != 1) { if (byte_write_result == 0) { // Check what kind of error has been signaled by TWI. uint32_t errorsrc = nrf_twi_errorsrc_get_and_clear(twi); if (errorsrc & NRF_TWI_ERROR_ADDRESS_NACK) { result = I2C_ERROR_NO_SLAVE; } else { // Some other error - return the number of bytes that // have been sent successfully. result -= length; } } else { result = I2C_ERROR_BUS_BUSY; } // Force STOP condition. stop = 1; break; } --length; } while (length > 0); if (stop) { (void)i2c_stop(obj); } return result; }
void wait_us(int us) { const ticker_data_t *const ticker = get_us_ticker_data(); uint32_t start = ticker_read(ticker); while ((ticker_read(ticker) - start) < (uint32_t)us); }
#include "mbed_helpers.h" #include "llos_system_timer.h" #include "llos_memory.h" //--// extern "C" { typedef struct LLOS_MbedTimer { LLOS_Context Context; ticker_event_t TickerEvent; } LLOS_MbedTimer; static LLOS_SYSTEM_TIMER_Callback s_TimerCallback = NULL; static const ticker_data_t *s_pTickerData = get_us_ticker_data(); // This is used to call back into the Kernel using a WellKnownMethod static void MbedInterruptHandler(uint32_t id) { if (s_TimerCallback != NULL) { LLOS_MbedTimer *pCtx = (LLOS_MbedTimer*)id; if (pCtx != NULL) { uint64_t ticks = us_ticker_read(); s_TimerCallback(pCtx->Context, ticks); } }
uint32_t HAL_GetTick() { return ticker_read_us(get_us_ticker_data()) / 1000; // 1 ms tick is required for ST HAL }