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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-06-21 RiceChen the first version
*/
#include <rthw.h>
#ifdef RT_USING_SERIAL
#if !defined(BSP_USING_UART0) && !defined(BSP_USING_UART1)
#error "Please define at least one UARTx"
#endif
#include "drv_usart.h"
static struct gd32_usart_config usart_config[] =
{
#ifdef BSP_USING_UART0
UART0_BUS_CONFIG,
#endif
#ifdef BSP_USING_UART1
UART1_BUS_CONFIG,
#endif
};
static struct gd32_usart_bus usart_obj[sizeof(usart_config) / sizeof(usart_config[0])];
void gd32_usart_gpio_init(struct gd32_usart_bus *bus)
{
rcu_periph_clock_enable(bus->config->per_clk);
rcu_periph_clock_enable(bus->config->tx_gpio_clk);
rcu_periph_clock_enable(bus->config->rx_gpio_clk);
gpio_af_set(bus->config->tx_port, GPIO_AF_1, bus->config->tx_pin);
gpio_af_set(bus->config->rx_port, GPIO_AF_1, bus->config->rx_pin);
gpio_mode_set(bus->config->tx_port, GPIO_MODE_AF, GPIO_PUPD_PULLUP, bus->config->tx_pin);
gpio_output_options_set(bus->config->tx_port, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, bus->config->tx_pin);
gpio_mode_set(bus->config->rx_port, GPIO_MODE_AF, GPIO_PUPD_PULLUP, bus->config->rx_pin);
gpio_output_options_set(bus->config->rx_port, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, bus->config->rx_pin);
NVIC_SetPriority(bus->config->irqn, 0);
NVIC_EnableIRQ(bus->config->irqn);
usart_deinit(bus->config->periph);
}
rt_err_t gd32_usart_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
struct gd32_usart_bus *bus = RT_NULL;
bus = (struct gd32_usart_bus *)serial->parent.user_data;
gd32_usart_gpio_init(bus);
usart_baudrate_set(bus->config->periph, cfg->baud_rate);
switch (cfg->data_bits)
{
case DATA_BITS_9:
usart_word_length_set(bus->config->periph, USART_WL_9BIT);
break;
default:
usart_word_length_set(bus->config->periph, USART_WL_8BIT);
break;
}
switch (cfg->stop_bits)
{
case STOP_BITS_2:
usart_stop_bit_set(bus->config->periph, USART_STB_2BIT);
break;
default:
usart_stop_bit_set(bus->config->periph, USART_STB_1BIT);
break;
}
switch (cfg->parity)
{
case PARITY_ODD:
usart_parity_config(bus->config->periph, USART_PM_ODD);
break;
case PARITY_EVEN:
usart_parity_config(bus->config->periph, USART_PM_EVEN);
break;
default:
usart_parity_config(bus->config->periph, USART_PM_NONE);
break;
}
usart_receive_config(bus->config->periph, USART_RECEIVE_ENABLE);
usart_transmit_config(bus->config->periph, USART_TRANSMIT_ENABLE);
usart_enable(bus->config->periph);
return RT_EOK;
}
rt_err_t gd32_usart_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct gd32_usart_bus *bus = RT_NULL;
bus = (struct gd32_usart_bus *)serial->parent.user_data;
switch (cmd)
{
case RT_DEVICE_CTRL_CLR_INT:
/* disable rx irq */
NVIC_DisableIRQ(bus->config->irqn);
/* disable interrupt */
usart_interrupt_disable(bus->config->periph, USART_INT_RBNE);
break;
case RT_DEVICE_CTRL_SET_INT:
/* enable rx irq */
NVIC_EnableIRQ(bus->config->irqn);
/* enable interrupt */
usart_interrupt_enable(bus->config->periph, USART_INT_RBNE);
break;
}
return RT_EOK;
}
int gd32_usart_putc(struct rt_serial_device *serial, char c)
{
struct gd32_usart_bus *bus = RT_NULL;
bus = (struct gd32_usart_bus *)serial->parent.user_data;
usart_data_transmit(bus->config->periph, c);
while((usart_flag_get(bus->config->periph, USART_FLAG_TC) == RESET));
return 1;
}
int gd32_usart_getc(struct rt_serial_device *serial)
{
int ch;
struct gd32_usart_bus *bus = RT_NULL;
bus = (struct gd32_usart_bus *)serial->parent.user_data;
ch = -1;
if (usart_flag_get(bus->config->periph, USART_FLAG_RBNE) != RESET)
ch = usart_data_receive(bus->config->periph);
return ch;
}
rt_size_t gd32_usart_dma_transmit(struct rt_serial_device *serial, rt_uint8_t *buf, rt_size_t size, int direction)
{
return RT_EOK;
}
static struct rt_uart_ops usart_ops =
{
gd32_usart_configure,
gd32_usart_control,
gd32_usart_putc,
gd32_usart_getc,
gd32_usart_dma_transmit,
};
static void uart_isr(rt_uint32_t periph)
{
int obj_num = 0;
struct gd32_usart_bus *bus = RT_NULL;
obj_num = sizeof(usart_config) / sizeof(usart_config[0]);
for(int i = 0; i < obj_num; i++)
{
if(usart_obj[i].config->periph == periph)
{
bus = &usart_obj[i];
break;
}
}
if(bus != RT_NULL)
{
if ((usart_interrupt_flag_get(bus->config->periph, USART_INT_FLAG_RBNE) != RESET) &&
(usart_flag_get(bus->config->periph, USART_FLAG_RBNE) != RESET))
{
rt_hw_serial_isr(&bus->serial, RT_SERIAL_EVENT_RX_IND);
/* Clear RXNE interrupt flag */
usart_flag_clear(bus->config->periph, USART_FLAG_RBNE);
}
}
}
#ifdef BSP_USING_UART0
void USART0_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(USART0);
/* leave interrupt */
rt_interrupt_leave();
}
#endif
#ifdef BSP_USING_UART1
void USART1_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(USART1);
/* leave interrupt */
rt_interrupt_leave();
}
#endif
int rt_hw_usart_init(void)
{
int obj_num = 0;
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
obj_num = sizeof(usart_config) / sizeof(usart_config[0]);
for(int i = 0; i < obj_num; i++)
{
usart_obj[i].serial.ops = &usart_ops;
usart_obj[i].serial.config = config;
usart_obj[i].config = &usart_config[i];
/* register UART device */
rt_hw_serial_register(&usart_obj[i].serial,
usart_obj[i].config->dev_name,
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
(void *)&usart_obj[i]);
}
return RT_EOK;
}
INIT_BOARD_EXPORT(rt_hw_usart_init);
#endif
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