I have recently been looking at the power_mode_switch_rtos example in the RT1050 SDK. The following code will be executed before entering and after exiting low power mode:
void APP_PowerPreSwitchHook(lpm_power_mode_t targetMode)
{
if (targetMode == LPM_PowerModeSNVS)
{
PRINTF("Now shutting down the system...\r\n");
}
if (targetMode > LPM_PowerModeRunEnd)
{
/* Wait for debug console output finished. */
while (!(kLPUART_TransmissionCompleteFlag & LPUART_GetStatusFlags((LPUART_Type *)BOARD_DEBUG_UART_BASEADDR)))
{
}
DbgConsole_Deinit();
/*
* Set pin for current leakage.
* Debug console RX pin: Set pinmux to GPIO input.
* Debug console TX pin: Don't need to change.
*/
ConfigUartRxPinToGpio();
}
}
void APP_PowerPostSwitchHook(lpm_power_mode_t targetMode)
{
if (targetMode > LPM_PowerModeRunEnd)
{
/*
* Debug console RX pin is set to GPIO input, need to re-configure pinmux.
* Debug console TX pin: Don't need to change.
*/
ReConfigUartRxPin();
BOARD_InitDebugConsole();
}
else
{
/* update current run mode */
APP_SetRunMode(targetMode);
}
}
What is the purpose of reconfiguring UART1 here? I checked the schematic of the RT1050 Evaluation Kit, and UART1 is not connected elsewhere. Why do we need to reconfigure the RX pin here?
