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/*
* Copyright (c) 2006-2018, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2018/10/28 Bernard Unify UART driver for FSL library.
* 2019/09/07 niannianyouyu Add the driver of UART1
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#include "board.h"
#include "drv_uart.h"
#include "fsl_lpuart.h"
struct fsl_uart
{
LPUART_Type *uart_base;
IRQn_Type irqn;
struct rt_serial_device *serial;
char *device_name;
};
static rt_err_t uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg);
static rt_err_t uart_control(struct rt_serial_device *serial, int cmd, void *arg);
static int uart_putc(struct rt_serial_device *serial, char c);
static int uart_getc(struct rt_serial_device *serial);
static rt_ssize_t uart_dma_transmit(struct rt_serial_device *serial, rt_uint8_t *buf, rt_size_t size, int direction);
static void uart_irq_handler(int irqno, void *param);
const struct rt_uart_ops _uart_ops =
{
uart_configure,
uart_control,
uart_putc,
uart_getc,
uart_dma_transmit
};
static void uart_isr(struct rt_serial_device *serial);
#if defined(BSP_USING_UART0)
struct rt_serial_device serial0;
void LPUART0_IRQHandler(void)
{
uart_isr(&serial0);
}
#endif
#if defined(BSP_USING_UART1)
struct rt_serial_device serial1;
void LPUART1_IRQHandler(void)
{
uart_isr(&serial1);
}
#endif
static const struct fsl_uart uarts[] =
{
#ifdef BSP_USING_UART0
{
LPUART0,
LPUART0_IRQn,
&serial0,
"uart0",
},
#ifdef BSP_USING_UART1
{
LPUART1,
LPUART1_IRQn,
&serial1,
"uart1",
},
#endif
#endif
};
/*
* UART Initiation
*/
int rt_hw_uart_init(void)
{
int i;
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
for (i = 0; i < sizeof(uarts) / sizeof(uarts[0]); i++)
{
uarts[i].serial->ops = &_uart_ops;
uarts[i].serial->config = config;
/* register UART device */
rt_hw_serial_register(uarts[i].serial,
uarts[i].device_name,
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
(void *)&uarts[i]);
}
return 0;
}
/*
* UART interface
*/
static rt_err_t uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
struct fsl_uart *uart;
lpuart_config_t config;
RT_ASSERT(serial != RT_NULL);
RT_ASSERT(cfg != RT_NULL);
uart = (struct fsl_uart *)serial->parent.user_data;
LPUART_GetDefaultConfig(&config);
config.baudRate_Bps = cfg->baud_rate;
switch (cfg->data_bits)
{
#if defined(FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT) && FSL_FEATURE_LPUART_HAS_7BIT_DATA_SUPPORT
case DATA_BITS_7:
config.dataBitsCount = kLPUART_SevenDataBits;
break;
#endif
default:
config.dataBitsCount = kLPUART_EightDataBits;
break;
}
switch (cfg->stop_bits)
{
case STOP_BITS_2:
config.stopBitCount = kLPUART_TwoStopBit;
break;
default:
config.stopBitCount = kLPUART_OneStopBit;
break;
}
switch (cfg->parity)
{
case PARITY_ODD:
config.parityMode = kLPUART_ParityOdd;
break;
case PARITY_EVEN:
config.parityMode = kLPUART_ParityEven;
break;
default:
config.parityMode = kLPUART_ParityDisabled;
break;
}
config.enableTx = true;
config.enableRx = true;
CLOCK_SetIpSrc(kCLOCK_Lpuart0, kCLOCK_IpSrcFircAsync);
uint32_t uartClkSrcFreq0 = CLOCK_GetIpFreq(kCLOCK_Lpuart0);
LPUART_Init(uart->uart_base, &config, uartClkSrcFreq0);
LPUART_EnableInterrupts(uart->uart_base, kLPUART_RxDataRegFullInterruptEnable);
CLOCK_SetIpSrc(kCLOCK_Lpuart1, kCLOCK_IpSrcFircAsync);
uint32_t uartClkSrcFreq1 = CLOCK_GetIpFreq(kCLOCK_Lpuart1);
LPUART_Init(uart->uart_base, &config, uartClkSrcFreq1);
LPUART_EnableInterrupts(uart->uart_base, kLPUART_RxDataRegFullInterruptEnable);
return RT_EOK;
}
static rt_err_t uart_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct fsl_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct fsl_uart *)serial->parent.user_data;
switch (cmd)
{
case RT_DEVICE_CTRL_CLR_INT:
/* disable rx irq */
DisableIRQ(uart->irqn);
break;
case RT_DEVICE_CTRL_SET_INT:
/* enable rx irq */
EnableIRQ(uart->irqn);
break;
}
return RT_EOK;
}
static int uart_putc(struct rt_serial_device *serial, char c)
{
struct fsl_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct fsl_uart *)serial->parent.user_data;
LPUART_WriteByte(uart->uart_base, c);
while (!(LPUART_GetStatusFlags(uart->uart_base) & kLPUART_TxDataRegEmptyFlag));
return (1);
}
static int uart_getc(struct rt_serial_device *serial)
{
int ch;
struct fsl_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct fsl_uart *)serial->parent.user_data;
ch = -1;
if (LPUART_GetStatusFlags(uart->uart_base) & kLPUART_RxDataRegFullFlag)
ch = LPUART_ReadByte(uart->uart_base);
return ch;
}
static rt_ssize_t uart_dma_transmit(struct rt_serial_device *serial, rt_uint8_t *buf, rt_size_t size, int direction)
{
return (0);
}
/* UART ISR */
/**
* Uart common interrupt process. This need add to uart ISR.
*
* @param serial serial device
*/
static void uart_isr(struct rt_serial_device *serial)
{
struct fsl_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct fsl_uart *) serial->parent.user_data;
RT_ASSERT(uart != RT_NULL);
/* UART in mode Receiver */
if (LPUART_GetStatusFlags(uart->uart_base) & kLPUART_RxDataRegFullFlag)
{
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
}
/* If RX overrun. */
if (LPUART_STAT_OR_MASK & uart->uart_base->STAT)
{
/* Clear overrun flag, otherwise the RX does not work. */
uart->uart_base->STAT = ((uart->uart_base->STAT & 0x3FE00000U) | LPUART_STAT_OR_MASK);
}
}
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