How to set UART Baudrate ?

RE: How to set UART Baudrate ?

MDF — Fri, 27 May 2022 09:30:15 GMT

ok, thanks, it works now

RE: How to set UART Baudrate ?

Priyanka — Fri, 27 May 2022 08:57:04 GMT

Hi,

Just like how @Vasiliy mentioned, you can change the UART baudrate dynamically by creating a variable of type uart_config. For more details you can take a look at our Dev academy.

Kind Regards,

Priyanka

RE: How to set UART Baudrate ?

qwertynoon — Thu, 26 May 2022 05:31:19 GMT

It was just a sample. You should study "struct"

struct uart_config {
	uint32_t baudrate;
	uint8_t parity;
	uint8_t stop_bits;
	uint8_t data_bits;
	uint8_t flow_ctrl;
};

/** @brief Parity modes */
enum uart_config_parity {
	UART_CFG_PARITY_NONE,
	UART_CFG_PARITY_ODD,
	UART_CFG_PARITY_EVEN,
	UART_CFG_PARITY_MARK,
	UART_CFG_PARITY_SPACE,
};

/** @brief Number of stop bits. */
enum uart_config_stop_bits {
	UART_CFG_STOP_BITS_0_5,
	UART_CFG_STOP_BITS_1,
	UART_CFG_STOP_BITS_1_5,
	UART_CFG_STOP_BITS_2,
};

/** @brief Number of data bits. */
enum uart_config_data_bits {
	UART_CFG_DATA_BITS_5,
	UART_CFG_DATA_BITS_6,
	UART_CFG_DATA_BITS_7,
	UART_CFG_DATA_BITS_8,
	UART_CFG_DATA_BITS_9,
};

/**
 * @brief Hardware flow control options.
 *
 * With flow control set to none, any operations related to flow control
 * signals can be managed by user with uart_line_ctrl functions.
 * In other cases, flow control is managed by hardware/driver.
 */
enum uart_config_flow_control {
	UART_CFG_FLOW_CTRL_NONE,
	UART_CFG_FLOW_CTRL_RTS_CTS,
	UART_CFG_FLOW_CTRL_DTR_DSR,
};

just enter according parameter

const struct uart_config uart_cfg = {
                                .baudrate  = 115200,
                                .parity    = UART_CFG_PARITY_NONE,
                                .stop_bits = UART_CFG_STOP_BITS_1,
                                .data_bits = UART_CFG_DATA_BITS_8,
                                .flow_ctrl = UART_CFG_FLOW_CTRL_NONE
                };
uart_configure(uart, &uart_cfg);

RE: How to set UART Baudrate ?

MDF — Wed, 25 May 2022 13:17:13 GMT

that does not work - all the "preset" things are undeclared

RE: How to set UART Baudrate ?

qwertynoon — Wed, 25 May 2022 13:11:37 GMT

Add this code in uart_init

const struct uart_config uart_cfg = {
                                .baudrate  = uart_speed_preset,
                                .parity    = uart_parity_preset,
                                .stop_bits = uart_stop_bits_preset,
                                .data_bits = UART_CFG_DATA_BITS_8,
                                .flow_ctrl = UART_CFG_FLOW_CTRL_NONE
                };
uart_configure(uart, &uart_cfg);