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Enable custom UART baudrate for nRF52 #712

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Enable custom UART baudrate for nRF52 #712

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d410cd7
Enable custom UART baudrate for nRF52
Jan 8, 2022
5e92a1f
Fix the compilation error
Jan 8, 2022
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43 changes: 3 additions & 40 deletions cores/nRF5/Uart.cpp
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Original file line number Diff line number Diff line change
@@ -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;