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/*
* File : usart.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006-2013, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2013-11-15 bright the first version
*/
#include <stm32f0xx.h>
#include <rtdevice.h>
#include "usart.h"
/* USART1 */
#define UART1_GPIO_TX GPIO_Pin_9
#define UART1_GPIO_TX_SOURCE GPIO_PinSource9
#define UART1_GPIO_RX GPIO_Pin_10
#define UART1_GPIO_RX_SOURCE GPIO_PinSource10
#define UART1_GPIO_AF GPIO_AF_1
#define UART1_GPIO GPIOA
/* USART2 */
#define UART2_GPIO_TX GPIO_Pin_2
#define UART2_GPIO_TX_SOURCE GPIO_PinSource2
#define UART2_GPIO_RX GPIO_Pin_3
#define UART2_GPIO_RX_SOURCE GPIO_PinSource3
#define UART2_GPIO_AF GPIO_AF_1
#define UART2_GPIO GPIOA
/* STM32 uart driver */
struct stm32_uart
{
USART_TypeDef* uart_device;
IRQn_Type irq;
};
static rt_err_t stm32_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
struct stm32_uart* uart;
USART_InitTypeDef USART_InitStructure;
RT_ASSERT(serial != RT_NULL);
RT_ASSERT(cfg != RT_NULL);
uart = (struct stm32_uart *)serial->parent.user_data;
USART_InitStructure.USART_BaudRate = cfg->baud_rate;
if (cfg->data_bits == DATA_BITS_8)
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
if (cfg->stop_bits == STOP_BITS_1)
USART_InitStructure.USART_StopBits = USART_StopBits_1;
else if (cfg->stop_bits == STOP_BITS_2)
USART_InitStructure.USART_StopBits = USART_StopBits_2;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(uart->uart_device, &USART_InitStructure);
/* Enable USART */
USART_Cmd(uart->uart_device, ENABLE);
/* enable interrupt */
USART_ITConfig(uart->uart_device, USART_IT_RXNE, ENABLE);
return RT_EOK;
}
static rt_err_t stm32_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct stm32_uart* uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct stm32_uart *)serial->parent.user_data;
switch (cmd)
{
case RT_DEVICE_CTRL_CLR_INT:
/* disable rx irq */
UART_DISABLE_IRQ(uart->irq);
break;
case RT_DEVICE_CTRL_SET_INT:
/* enable rx irq */
UART_ENABLE_IRQ(uart->irq);
break;
}
return RT_EOK;
}
static int stm32_putc(struct rt_serial_device *serial, char c)
{
struct stm32_uart* uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct stm32_uart *)serial->parent.user_data;
while (!(uart->uart_device->ISR & USART_FLAG_TXE));
uart->uart_device->TDR = c;
return 1;
}
static int stm32_getc(struct rt_serial_device *serial)
{
int ch;
struct stm32_uart* uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct stm32_uart *)serial->parent.user_data;
ch = -1;
if (uart->uart_device->ISR & USART_FLAG_RXNE)
{
ch = uart->uart_device->RDR & 0xff;
}
return ch;
}
static const struct rt_uart_ops stm32_uart_ops =
{
stm32_configure,
stm32_control,
stm32_putc,
stm32_getc,
};
#if defined(RT_USING_UART1)
/* UART1 device driver structure */
struct stm32_uart uart1 =
{
USART1,
USART1_IRQn,
};
struct rt_serial_device serial1;
void USART1_IRQHandler(void)
{
struct stm32_uart* uart;
uart = &uart1;
/* enter interrupt */
rt_interrupt_enter();
if(USART_GetITStatus(uart->uart_device, USART_IT_RXNE) != RESET)
{
rt_hw_serial_isr(&serial1, RT_SERIAL_EVENT_RX_IND);
}
if (USART_GetITStatus(uart->uart_device, USART_IT_TC) != RESET)
{
/* clear interrupt */
USART_ClearITPendingBit(uart->uart_device, USART_IT_TC);
}
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* RT_USING_UART1 */
#if defined(RT_USING_UART2)
/* UART2 device driver structure */
struct stm32_uart uart2 =
{
USART2,
USART2_IRQn,
};
struct rt_serial_device serial2;
void USART2_IRQHandler(void)
{
struct stm32_uart* uart;
uart = &uart2;
/* enter interrupt */
rt_interrupt_enter();
if(USART_GetITStatus(uart->uart_device, USART_IT_RXNE) != RESET)
{
rt_hw_serial_isr(&serial2, RT_SERIAL_EVENT_RX_IND);
}
if (USART_GetITStatus(uart->uart_device, USART_IT_TC) != RESET)
{
/* clear interrupt */
USART_ClearITPendingBit(uart->uart_device, USART_IT_TC);
}
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* RT_USING_UART2 */
static void RCC_Configuration(void)
{
#ifdef RT_USING_UART1
/* Enable GPIO clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/* Enable USART clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
#endif /* RT_USING_UART1 */
#ifdef RT_USING_UART2
/* Enable GPIO clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/* Enable USART clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
#endif /* RT_USING_UART2 */
}
static void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
#ifdef RT_USING_UART1
/* Connect PXx to USARTx_Tx */
GPIO_PinAFConfig(UART1_GPIO, UART1_GPIO_TX_SOURCE, UART1_GPIO_AF);
/* Connect PXx to USARTx_Rx */
GPIO_PinAFConfig(UART1_GPIO, UART1_GPIO_RX_SOURCE, UART1_GPIO_AF);
/* Configure USART Tx, Rx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = UART1_GPIO_TX | UART1_GPIO_RX;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(UART1_GPIO, &GPIO_InitStructure);
#endif /* RT_USING_UART1 */
#ifdef RT_USING_UART2
/* Connect PXx to USARTx_Tx */
GPIO_PinAFConfig(UART2_GPIO, UART2_GPIO_TX_SOURCE, UART2_GPIO_AF);
/* Connect PXx to USARTx_Rx */
GPIO_PinAFConfig(UART2_GPIO, UART2_GPIO_RX_SOURCE, UART2_GPIO_AF);
/* Configure USART Tx, Rx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = UART2_GPIO_TX | UART2_GPIO_RX;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(UART2_GPIO, &GPIO_InitStructure);
#endif /* RT_USING_UART2 */
}
static void NVIC_Configuration(struct stm32_uart* uart)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable the USART Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = uart->irq;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void rt_hw_usart_init(void)
{
struct stm32_uart* uart;
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
RCC_Configuration();
GPIO_Configuration();
#ifdef RT_USING_UART1
uart = &uart1;
config.baud_rate = BAUD_RATE_115200;
serial1.ops = &stm32_uart_ops;
serial1.config = config;
NVIC_Configuration(&uart1);
/* register UART1 device */
rt_hw_serial_register(&serial1, "uart1",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
uart);
#endif /* RT_USING_UART1 */
#ifdef RT_USING_UART2
uart = &uart2;
config.baud_rate = BAUD_RATE_115200;
serial2.ops = &stm32_uart_ops;
serial2.config = config;
NVIC_Configuration(&uart2);
/* register UART1 device */
rt_hw_serial_register(&serial2, "uart2",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
uart);
#endif /* RT_USING_UART2 */
}
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