Hi I am now working on a project which I use ble_app_uart_c as a reference. SDK 15.2 and used softdevice s132. In the project I need to disable the UART before it enters into System ON sleep mode. But when I measure the current using the PPK, the current consumption doesn't change after I close the UART using "app_uart_close". In the following snippet, you will see, I just initialize the UART module and close it after 5seconds. But the current consumption is still the same as shown in the figurre.
static void uart_init(void)
{
uint32_t err_code;
app_uart_comm_params_t const comm_params =
{
.rx_pin_no = 8/*RX_PIN_NUMBER*/,
.tx_pin_no = 6/*TX_PIN_NUMBER*/,
.rts_pin_no = RTS_PIN_NUMBER,
.cts_pin_no = CTS_PIN_NUMBER,
.flow_control = APP_UART_FLOW_CONTROL_DISABLED,
.use_parity = false,
#if defined (UART_PRESENT)
.baud_rate = UARTE_BAUDRATE_BAUDRATE_Baud115200
#else
.baud_rate = NRF_UARTE_BAUDRATE_115200
#endif
};
APP_UART_FIFO_INIT(&comm_params,
UART_RX_BUF_SIZE,
UART_TX_BUF_SIZE,
uart_event_handle,
APP_IRQ_PRIORITY_LOWEST,
err_code);
APP_ERROR_CHECK(err_code);
}
int main(void)
{
uart_init();
nrf_delay_ms(5000);
app_uart_close();
nrf_delay_ms(100);
for(;;)
{
idle_state_handle();
}
}
Here is the one in which I just directly goes to system ON sleep and the current consumption is way more reduced.
int main(void)
{
//uart_init();
nrf_delay_ms(5000);
//app_uart_close();
nrf_delay_ms(100);
for(;;)
{
idle_state_handle();
}
}
What's the reason for this. Is there any more else to do to disable UART totally? Really needs your help. Thanks.
