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rt-thread-official/bsp/n32g452xx/Libraries/rt_drivers/drv_usart.c

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/*
* File : usart.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006-2021, 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
* 2009-01-05 Bernard the first version
* 2010-03-29 Bernard remove interrupt Tx and DMA Rx mode
* 2013-05-13 aozima update for kehong-lingtai.
* 2015-01-31 armink make sure the serial transmit complete in putc()
* 2016-05-13 armink add DMA Rx mode
* 2017-01-19 aubr.cool add interrupt Tx mode
* 2017-04-13 aubr.cool correct Rx parity err
* 2021-08-20 breo.com first version
*/
#include <rtdevice.h>
#include <rthw.h>
#include <board.h>
#include "drv_usart.h"
#define UART_ENABLE_IRQ(n) NVIC_EnableIRQ((n))
#define UART_DISABLE_IRQ(n) NVIC_DisableIRQ((n))
struct n32_uart
{
USART_Module *uart_device;
IRQn_Type irq;
struct n32_uart_dma
{
/* dma channel */
DMA_ChannelType *rx_ch;
DMA_Module *rx_dma_type;
/* dma global flag */
uint32_t rx_gl_flag;
/* dma irq channel */
uint8_t rx_irq_ch;
/* setting receive len */
rt_size_t setting_recv_len;
/* last receive index */
rt_size_t last_recv_index;
} dma;
};
static void DMA_Configuration(struct rt_serial_device *serial);
static rt_err_t n32_uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
struct n32_uart *uart;
USART_InitType USART_InitStructure;
RT_ASSERT(serial != RT_NULL);
RT_ASSERT(cfg != RT_NULL);
uart = (struct n32_uart *)serial->parent.user_data;
RT_ASSERT(uart != RT_NULL);
RT_ASSERT((uart->uart_device) != RT_NULL);
n32_msp_usart_init(uart->uart_device);
USART_InitStructure.BaudRate = cfg->baud_rate;
if (cfg->data_bits == DATA_BITS_8)
{
USART_InitStructure.WordLength = USART_WL_8B;
}
else if (cfg->data_bits == DATA_BITS_9)
{
USART_InitStructure.WordLength = USART_WL_9B;
}
if (cfg->stop_bits == STOP_BITS_1)
{
USART_InitStructure.StopBits = USART_STPB_1;
}
else if (cfg->stop_bits == STOP_BITS_2)
{
USART_InitStructure.StopBits = USART_STPB_2;
}
if (cfg->parity == PARITY_NONE)
{
USART_InitStructure.Parity = USART_PE_NO;
}
else if (cfg->parity == PARITY_ODD)
{
USART_InitStructure.Parity = USART_PE_ODD;
}
else if (cfg->parity == PARITY_EVEN)
{
USART_InitStructure.Parity = USART_PE_EVEN;
}
USART_InitStructure.HardwareFlowControl = USART_HFCTRL_NONE;
USART_InitStructure.Mode = USART_MODE_RX | USART_MODE_TX;
USART_Init(uart->uart_device, &USART_InitStructure);
/* Enable USART */
USART_Enable(uart->uart_device, ENABLE);
USART_ClrFlag(uart->uart_device, USART_FLAG_TXDE | USART_FLAG_TXC);
return RT_EOK;
}
static rt_err_t n32_uart_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct n32_uart *uart;
rt_uint32_t ctrl_arg = (rt_uint32_t)(arg);
RT_ASSERT(serial != RT_NULL);
uart = (struct n32_uart *)serial->parent.user_data;
switch (cmd)
{
/* disable interrupt */
case RT_DEVICE_CTRL_CLR_INT:
/* disable rx irq */
UART_DISABLE_IRQ(uart->irq);
/* disable interrupt */
USART_ConfigInt(uart->uart_device, USART_INT_RXDNE, DISABLE);
break;
/* enable interrupt */
case RT_DEVICE_CTRL_SET_INT:
/* enable rx irq */
UART_ENABLE_IRQ(uart->irq);
/* enable interrupt */
USART_ConfigInt(uart->uart_device, USART_INT_RXDNE, ENABLE);
break;
/* USART config */
case RT_DEVICE_CTRL_CONFIG :
if (ctrl_arg == RT_DEVICE_FLAG_DMA_RX)
{
DMA_Configuration(serial);
}
break;
}
return RT_EOK;
}
static int n32_uart_putc(struct rt_serial_device *serial, char c)
{
struct n32_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct n32_uart *)serial->parent.user_data;
if (serial->parent.open_flag & RT_DEVICE_FLAG_INT_TX)
{
if (!(uart->uart_device->STS & USART_FLAG_TXDE))
{
USART_ConfigInt(uart->uart_device, USART_INT_TXC, ENABLE);
return -1;
}
uart->uart_device->DAT = c;
USART_ConfigInt(uart->uart_device, USART_INT_TXC, ENABLE);
}
else
{
uart->uart_device->DAT = c;
while (!(uart->uart_device->STS & USART_FLAG_TXC));
}
return 1;
}
static int n32_uart_getc(struct rt_serial_device *serial)
{
int ch;
struct n32_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct n32_uart *)serial->parent.user_data;
ch = -1;
if (uart->uart_device->STS & USART_FLAG_RXDNE)
{
ch = uart->uart_device->DAT & 0xff;
}
return ch;
}
/**
* Serial port receive idle process. This need add to uart idle ISR.
*
* @param serial serial device
*/
static void dma_uart_rx_idle_isr(struct rt_serial_device *serial)
{
struct n32_uart *uart = (struct n32_uart *) serial->parent.user_data;
rt_size_t recv_total_index, recv_len;
rt_base_t level;
/* disable interrupt */
level = rt_hw_interrupt_disable();
recv_total_index = uart->dma.setting_recv_len - DMA_GetCurrDataCounter(uart->dma.rx_ch);
recv_len = recv_total_index - uart->dma.last_recv_index;
uart->dma.last_recv_index = recv_total_index;
/* enable interrupt */
rt_hw_interrupt_enable(level);
if (recv_len)
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_DMADONE | (recv_len << 8));
/* read a data for clear receive idle interrupt flag */
USART_ReceiveData(uart->uart_device);
DMA_ClearFlag(uart->dma.rx_gl_flag, uart->dma.rx_dma_type);
}
/**
* DMA receive done process. This need add to DMA receive done ISR.
*
* @param serial serial device
*/
static void dma_rx_done_isr(struct rt_serial_device *serial)
{
struct n32_uart *uart = (struct n32_uart *) serial->parent.user_data;
rt_size_t recv_len;
rt_base_t level;
/* disable interrupt */
level = rt_hw_interrupt_disable();
recv_len = uart->dma.setting_recv_len - uart->dma.last_recv_index;
/* reset last recv index */
uart->dma.last_recv_index = 0;
/* enable interrupt */
rt_hw_interrupt_enable(level);
if (recv_len)
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_DMADONE | (recv_len << 8));
DMA_ClearFlag(uart->dma.rx_gl_flag, uart->dma.rx_dma_type);
}
/**
* Uart common interrupt process. This need add to uart ISR.
*
* @param serial serial device
*/
static void uart_isr(struct rt_serial_device *serial)
{
struct n32_uart *uart = (struct n32_uart *) serial->parent.user_data;
RT_ASSERT(uart != RT_NULL);
if (USART_GetIntStatus(uart->uart_device, USART_INT_RXDNE) != RESET)
{
if (USART_GetFlagStatus(uart->uart_device, USART_FLAG_PEF) == RESET)
{
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
}
/* clear interrupt */
USART_ClrIntPendingBit(uart->uart_device, USART_INT_RXDNE);
}
if (USART_GetIntStatus(uart->uart_device, USART_INT_IDLEF) != RESET)
{
dma_uart_rx_idle_isr(serial);
}
if (USART_GetIntStatus(uart->uart_device, USART_INT_TXC) != RESET)
{
/* clear interrupt */
if (serial->parent.open_flag & RT_DEVICE_FLAG_INT_TX)
{
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_TX_DONE);
}
USART_ConfigInt(uart->uart_device, USART_INT_TXC, DISABLE);
USART_ClrIntPendingBit(uart->uart_device, USART_INT_TXC);
}
if (USART_GetFlagStatus(uart->uart_device, USART_FLAG_OREF) == SET)
{
n32_uart_getc(serial);
}
}
static const struct rt_uart_ops n32_uart_ops =
{
n32_uart_configure,
n32_uart_control,
n32_uart_putc,
n32_uart_getc,
};
#if defined(BSP_USING_UART1)
/* UART1 device driver structure */
struct n32_uart uart1 =
{
USART1,
USART1_IRQn,
{
DMA1_CH5,
DMA1,
DMA1_FLAG_GL5,
DMA1_Channel5_IRQn,
0,
},
};
struct rt_serial_device serial1;
void USART1_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(&serial1);
/* leave interrupt */
rt_interrupt_leave();
}
void DMA1_Channel5_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
dma_rx_done_isr(&serial1);
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* BSP_USING_UART1 */
#if defined(BSP_USING_UART2)
/* UART2 device driver structure */
struct n32_uart uart2 =
{
USART2,
USART2_IRQn,
{
DMA1_CH6,
DMA1,
DMA1_FLAG_GL6,
DMA1_Channel6_IRQn,
0,
},
};
struct rt_serial_device serial2;
void USART2_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(&serial2);
/* leave interrupt */
rt_interrupt_leave();
}
void DMA1_Channel6_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
dma_rx_done_isr(&serial2);
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* BSP_USING_UART2 */
#if defined(BSP_USING_UART3)
/* UART3 device driver structure */
struct n32_uart uart3 =
{
USART3,
USART3_IRQn,
{
DMA1_CH3,
DMA1,
DMA1_FLAG_GL3,
DMA1_Channel3_IRQn,
0,
},
};
struct rt_serial_device serial3;
void USART3_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(&serial3);
/* leave interrupt */
rt_interrupt_leave();
}
void DMA1_Channel3_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
dma_rx_done_isr(&serial3);
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* BSP_USING_UART3 */
#if defined(BSP_USING_UART4)
/* UART4 device driver structure */
struct n32_uart uart4 =
{
UART4,
UART4_IRQn,
{
DMA2_CH3,
DMA2,
DMA2_FLAG_GL3,
DMA2_Channel3_IRQn,
0,
},
};
struct rt_serial_device serial4;
void UART4_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(&serial4);
/* leave interrupt */
rt_interrupt_leave();
}
void DMA2_Channel3_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
dma_rx_done_isr(&serial4);
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* BSP_USING_UART4 */
#if defined(BSP_USING_UART5)
/* UART5 device driver structure */
struct n32_uart uart5 =
{
UART5,
UART5_IRQn,
{
DMA1_CH8,
DMA1,
DMA1_FLAG_GL8,
DMA1_Channel8_IRQn,
0,
},
};
struct rt_serial_device serial5;
void UART5_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(&serial5);
/* leave interrupt */
rt_interrupt_leave();
}
void DMA1_Channel8_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
dma_rx_done_isr(&serial5);
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* BSP_USING_UART5 */
#if defined(BSP_USING_UART6)
/* UART6 device driver structure */
struct n32_uart uart6 =
{
UART6,
UART6_IRQn,
{
DMA2_CH1,
DMA2,
DMA2_FLAG_GL1,
DMA2_Channel1_IRQn,
0,
},
};
struct rt_serial_device serial6;
void UART6_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(&serial6);
/* leave interrupt */
rt_interrupt_leave();
}
void DMA2_Channel1_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
dma_rx_done_isr(&serial6);
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* BSP_USING_UART6 */
#if defined(BSP_USING_UART7)
/* UART7 device driver structure */
struct n32_uart uart7 =
{
UART7,
UART7_IRQn,
{
DMA2_CH6,
DMA2,
DMA2_FLAG_GL6,
DMA2_Channel6_IRQn,
0,
},
};
struct rt_serial_device serial7;
void UART7_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(&serial7);
/* leave interrupt */
rt_interrupt_leave();
}
void DMA2_Channel6_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
dma_rx_done_isr(&serial7);
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* BSP_USING_UART7 */
static void NVIC_Configuration(struct n32_uart *uart)
{
NVIC_InitType NVIC_InitStructure;
/* Enable the USART1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = uart->irq;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
static void DMA_Configuration(struct rt_serial_device *serial)
{
struct n32_uart *uart = (struct n32_uart *) serial->parent.user_data;
struct rt_serial_rx_fifo *rx_fifo = (struct rt_serial_rx_fifo *)serial->serial_rx;
DMA_InitType DMA_InitStructure;
NVIC_InitType NVIC_InitStructure;
uart->dma.setting_recv_len = serial->config.bufsz;
/* enable transmit idle interrupt */
USART_ConfigInt(uart->uart_device, USART_INT_IDLEF, ENABLE);
/* DMA clock enable */
RCC_EnableAHBPeriphClk(RCC_AHB_PERIPH_DMA1, ENABLE);
RCC_EnableAHBPeriphClk(RCC_AHB_PERIPH_DMA2, ENABLE);
/* rx dma config */
DMA_DeInit(uart->dma.rx_ch);
DMA_InitStructure.PeriphAddr = (uint32_t) & (uart->uart_device->DAT);
DMA_InitStructure.MemAddr = (uint32_t)(rx_fifo->buffer);
DMA_InitStructure.Direction = DMA_DIR_PERIPH_SRC;
DMA_InitStructure.BufSize = serial->config.bufsz;
DMA_InitStructure.PeriphInc = DMA_PERIPH_INC_DISABLE;
DMA_InitStructure.DMA_MemoryInc = DMA_MEM_INC_ENABLE;
DMA_InitStructure.PeriphDataSize = DMA_PERIPH_DATA_SIZE_BYTE;
DMA_InitStructure.MemDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.CircularMode = DMA_MODE_CIRCULAR;
DMA_InitStructure.Priority = DMA_PRIORITY_HIGH;
DMA_InitStructure.Mem2Mem = DMA_M2M_DISABLE;
DMA_Init(uart->dma.rx_ch, &DMA_InitStructure);
DMA_ClearFlag(uart->dma.rx_gl_flag, uart->dma.rx_dma_type);
DMA_ConfigInt(uart->dma.rx_ch, DMA_INT_TXC, ENABLE);
USART_EnableDMA(uart->uart_device, USART_DMAREQ_RX, ENABLE);
DMA_EnableChannel(uart->dma.rx_ch, ENABLE);
/* rx dma interrupt config */
NVIC_InitStructure.NVIC_IRQChannel = uart->dma.rx_irq_ch;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
int rt_hw_usart_init(void)
{
struct n32_uart *uart;
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
#if defined(BSP_USING_UART1)
uart = &uart1;
config.baud_rate = BAUD_RATE_115200;
serial1.ops = &n32_uart_ops;
serial1.config = config;
NVIC_Configuration(uart);
/* register UART1 device */
rt_hw_serial_register(&serial1, "uart1",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX |
RT_DEVICE_FLAG_INT_TX | RT_DEVICE_FLAG_DMA_RX,
uart);
#endif /* BSP_USING_UART1 */
#if defined(BSP_USING_UART2)
uart = &uart2;
config.baud_rate = BAUD_RATE_115200;
serial2.ops = &n32_uart_ops;
serial2.config = config;
NVIC_Configuration(uart);
/* register UART2 device */
rt_hw_serial_register(&serial2, "uart2",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX |
RT_DEVICE_FLAG_INT_TX | RT_DEVICE_FLAG_DMA_RX,
uart);
#endif /* BSP_USING_UART2 */
#if defined(BSP_USING_UART3)
uart = &uart3;
config.baud_rate = BAUD_RATE_115200;
serial3.ops = &n32_uart_ops;
serial3.config = config;
NVIC_Configuration(uart);
/* register UART3 device */
rt_hw_serial_register(&serial3, "uart3",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX |
RT_DEVICE_FLAG_INT_TX | RT_DEVICE_FLAG_DMA_RX,
uart);
#endif /* BSP_USING_UART3 */
#if defined(BSP_USING_UART4)
uart = &uart4;
config.baud_rate = BAUD_RATE_115200;
serial4.ops = &n32_uart_ops;
serial4.config = config;
NVIC_Configuration(uart);
/* register UART4 device */
rt_hw_serial_register(&serial4, "uart4",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX |
RT_DEVICE_FLAG_INT_TX | RT_DEVICE_FLAG_DMA_RX,
uart);
#endif /* BSP_USING_UART4 */
#if defined(BSP_USING_UART5)
uart = &uart5;
config.baud_rate = BAUD_RATE_115200;
serial5.ops = &n32_uart_ops;
serial5.config = config;
NVIC_Configuration(uart);
/* register UART5 device */
rt_hw_serial_register(&serial5, "uart5",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX |
RT_DEVICE_FLAG_INT_TX | RT_DEVICE_FLAG_DMA_RX,
uart);
#endif /* BSP_USING_UART5 */
#if defined(BSP_USING_UART6)
uart = &uart6;
config.baud_rate = BAUD_RATE_115200;
serial6.ops = &n32_uart_ops;
serial6.config = config;
NVIC_Configuration(uart);
/* register UART6 device */
rt_hw_serial_register(&serial6, "uart6",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX |
RT_DEVICE_FLAG_INT_TX | RT_DEVICE_FLAG_DMA_RX,
uart);
#endif /* BSP_USING_UART6 */
#if defined(BSP_USING_UART7)
uart = &uart7;
config.baud_rate = BAUD_RATE_115200;
serial7.ops = &n32_uart_ops;
serial7.config = config;
NVIC_Configuration(uart);
/* register UART7 device */
rt_hw_serial_register(&serial7, "uart7",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX |
RT_DEVICE_FLAG_INT_TX | RT_DEVICE_FLAG_DMA_RX,
uart);
#endif /* BSP_USING_UART7 */
return RT_EOK;
}
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