/** Initialize the USART peripheral.
*
* @param obj_s The serial object
*/
static void usart_init(struct serial_s *obj_s)
{
if (obj_s->index >= USART_NUM) {
return;
}
/* USART configuration */
usart_deinit(obj_s->uart);
usart_word_length_set(obj_s->uart, obj_s->databits);
usart_baudrate_set(obj_s->uart, obj_s->baudrate);
usart_stop_bit_set(obj_s->uart, obj_s->stopbits);
usart_parity_config(obj_s->uart, obj_s->parity);
#if DEVICE_SERIAL_FC
if (obj_s->hw_flow_ctl == USART_HWCONTROL_NONE) {
usart_hardware_flow_cts_config(obj_s->uart, USART_CTS_DISABLE);
usart_hardware_flow_rts_config(obj_s->uart, USART_RTS_DISABLE);
} else if (obj_s->hw_flow_ctl == USART_HWCONTROL_RTS) {
usart_hardware_flow_cts_config(obj_s->uart, USART_CTS_DISABLE);
usart_hardware_flow_rts_config(obj_s->uart, USART_RTS_ENABLE);
} else if (obj_s->hw_flow_ctl == USART_HWCONTROL_CTS) {
usart_hardware_flow_cts_config(obj_s->uart, USART_CTS_ENABLE);
usart_hardware_flow_rts_config(obj_s->uart, USART_RTS_DISABLE);
} else if (obj_s->hw_flow_ctl == USART_HWCONTROL_RTS_CTS) {
usart_hardware_flow_cts_config(obj_s->uart, USART_CTS_ENABLE);
usart_hardware_flow_rts_config(obj_s->uart, USART_RTS_ENABLE);
}
#endif /* DEVICE_SERIAL_FC */
usart_receive_config(obj_s->uart, USART_RECEIVE_ENABLE);
usart_transmit_config(obj_s->uart, USART_TRANSMIT_ENABLE);
usart_enable(obj_s->uart);
}
static rt_err_t gd32_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
struct gd32_uart *uart;
RT_ASSERT(serial != RT_NULL);
RT_ASSERT(cfg != RT_NULL);
uart = (struct gd32_uart *)serial->parent.user_data;
gd32_uart_gpio_init(uart);
usart_baudrate_set(uart->uart_periph, cfg->baud_rate);
switch (cfg->data_bits)
{
case DATA_BITS_9:
usart_word_length_set(uart->uart_periph, USART_WL_9BIT);
break;
default:
usart_word_length_set(uart->uart_periph, USART_WL_8BIT);
break;
}
switch (cfg->stop_bits)
{
case STOP_BITS_2:
usart_stop_bit_set(uart->uart_periph, USART_STB_2BIT);
break;
default:
usart_stop_bit_set(uart->uart_periph, USART_STB_1BIT);
break;
}
switch (cfg->parity)
{
case PARITY_ODD:
usart_parity_config(uart->uart_periph, USART_PM_ODD);
break;
case PARITY_EVEN:
usart_parity_config(uart->uart_periph, USART_PM_EVEN);
break;
default:
usart_parity_config(uart->uart_periph, USART_PM_NONE);
break;
}
usart_receive_config(uart->uart_periph, USART_RECEIVE_ENABLE);
usart_transmit_config(uart->uart_periph, USART_TRANSMIT_ENABLE);
usart_enable(uart->uart_periph);
return RT_EOK;
}
/** Configure the baud rate
*
* @param obj The serial object
* @param baudrate The baud rate to be configured
*/
void serial_baud(serial_t *obj, int baudrate)
{
uint16_t uen_flag = 0U;
struct serial_s *p_obj = GET_SERIAL_S(obj);
/* store the UEN flag */
uen_flag = USART_CTL0(p_obj->uart) & USART_CTL0_UEN;
/* disable the USART first */
usart_disable(p_obj->uart);
usart_baudrate_set(p_obj->uart, baudrate);
p_obj->baudrate = baudrate;
/* restore the UEN flag */
if (RESET != uen_flag) {
usart_enable(p_obj->uart);
}
}