Skip to content

Enable custom UART baudrate for nRF52 #712

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 2 commits into
base: master
Choose a base branch
from
Open

Enable custom UART baudrate for nRF52 #712

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
d410cd7
Enable custom UART baudrate for nRF52
Jan 8, 2022
5e92a1f
Fix the compilation error
Jan 8, 2022
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
43 changes: 3 additions & 40 deletions cores/nRF5/Uart.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -87,46 +87,9 @@ void Uart::begin(unsigned long baudrate, uint16_t config)
} else {
nrfUart->CONFIG = config | (UARTE_CONFIG_HWFC_Disabled << UARTE_CONFIG_HWFC_Pos);
}

uint32_t nrfBaudRate;

if (baudrate <= 1200) {
nrfBaudRate = UARTE_BAUDRATE_BAUDRATE_Baud1200;
} else if (baudrate <= 2400) {
nrfBaudRate = UARTE_BAUDRATE_BAUDRATE_Baud2400;
} else if (baudrate <= 4800) {
nrfBaudRate = UARTE_BAUDRATE_BAUDRATE_Baud4800;
} else if (baudrate <= 9600) {
nrfBaudRate = UARTE_BAUDRATE_BAUDRATE_Baud9600;
} else if (baudrate <= 14400) {
nrfBaudRate = UARTE_BAUDRATE_BAUDRATE_Baud14400;
} else if (baudrate <= 19200) {
nrfBaudRate = UARTE_BAUDRATE_BAUDRATE_Baud19200;
} else if (baudrate <= 28800) {
nrfBaudRate = UARTE_BAUDRATE_BAUDRATE_Baud28800;
} else if (baudrate <= 31250) {
nrfBaudRate = UARTE_BAUDRATE_BAUDRATE_Baud31250;
} else if (baudrate <= 38400) {
nrfBaudRate = UARTE_BAUDRATE_BAUDRATE_Baud38400;
} else if (baudrate <= 56000) {
nrfBaudRate = UARTE_BAUDRATE_BAUDRATE_Baud56000;
} else if (baudrate <= 57600) {
nrfBaudRate = UARTE_BAUDRATE_BAUDRATE_Baud57600;
} else if (baudrate <= 76800) {
nrfBaudRate = UARTE_BAUDRATE_BAUDRATE_Baud76800;
} else if (baudrate <= 115200) {
nrfBaudRate = UARTE_BAUDRATE_BAUDRATE_Baud115200;
} else if (baudrate <= 230400) {
nrfBaudRate = UARTE_BAUDRATE_BAUDRATE_Baud230400;
} else if (baudrate <= 250000) {
nrfBaudRate = UARTE_BAUDRATE_BAUDRATE_Baud250000;
} else if (baudrate <= 460800) {
nrfBaudRate = UARTE_BAUDRATE_BAUDRATE_Baud460800;
} else if (baudrate <= 921600) {
nrfBaudRate = UARTE_BAUDRATE_BAUDRATE_Baud921600;
} else {
nrfBaudRate = UARTE_BAUDRATE_BAUDRATE_Baud1M;
}

const double regValue = 268.43f*(double)baudrate; /* 2^32 / 16000000 = 268.43f. more details here: https://devzone.nordicsemi.com/f/nordic-q-a/391/uart-baudrate-register-values */
const uint32_t nrfBaudRate = ((uint32_t)regValue + 0x800) & 0xFFFFF000;

nrfUart->BAUDRATE = nrfBaudRate;

Expand Down