NRF52: Ensure that we configure hardware after flow control changes

[naveenkaje]

Call the routines to program the hardware to reflect the updates made to
flow control so that the object and hardware are in synch.

Description

During the initialization of the UART, when the flow control is set on the object, it is possible that the change does not get reflected in hardware. See attached screenshot. This change makes sure that we update the hardware registers.

Pull request type

[ x] Fix
[ ] Refactor
[ ] Target update
[ ] Functionality change
[ ] Breaking change

[naveenkaje]

Test code used.

#include "mbed.h"

DigitalOut led1(LED1);

int main() {
    Serial serial(USBTX, USBRX);
    serial.printf("Hello world\r\n");
    char c;
    while (true) {
        if (serial.readable()) {
			c = serial.getc();
			if (c == '\n' || c == '\r')
				serial.printf("\n\r");
			else
				serial.putc(c);
			
			/* LED Debug, to see if we are reading */
			if (c & 0x01)
				led1 = 1;
			else
				led1 = 0;
        }
    }
}

[0xc0170]

/morph build

[mbed-ci]

Build : SUCCESS

Build number : 3219
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/8061/

Triggering tests

/morph test
/morph mbed2-build

[mbed-ci]

Test : FAILURE

Build number : 3022
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/8061/3022

[NirSonnenschein]

failure seems unrelated to PR
/morph build

[mbed-ci]

Build : SUCCESS

Build number : 3225
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/8061/

Triggering tests

/morph test
/morph mbed2-build

[mbed-ci]

Test : FAILURE

Build number : 3028
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/8061/3028

[0xc0170]

We will restart tests once we get fixed exporters on master (will require immediate testing).

[0xc0170]

test queue is big, so will retry new jobs a bit later, exporters now

/morph export-build

[mbed-ci]

Exporter Build : SUCCESS

Build number : 2862
Build artifacts/logs : http://mbed-os.s3-website-eu-west-1.amazonaws.com/?prefix=builds/exporter/8061/

[studavekar]

/morph test

[mbed-ci]

Test : SUCCESS

Build number : 3070
Test logs :http://mbed-os-logs.s3-website-us-west-1.amazonaws.com/?prefix=logs/8061/3070