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rt-thread-official/bsp/imxrt1052-evk/drivers/usart.c

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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
* 2017-10-10 Tanek the first version
*/
#include <rtthread.h>
#include "usart.h"
#include "fsl_common.h"
#include "fsl_lpuart.h"
#include "fsl_iomuxc.h"
#ifdef RT_USING_UART
#if !defined(RT_USING_UART0) && !defined(RT_USING_UART1) && \
!defined(RT_USING_UART2) && !defined(RT_USING_UART3) && \
!defined(RT_USING_UART4) && !defined(RT_USING_UART5) && \
!defined(RT_USING_UART6) && !defined(RT_USING_UART7)
#error "Please define at least one UARTx"
#endif
#include <rtdevice.h>
/* imxrt uart driver */
struct imxrt_uart
{
LPUART_Type * uart_base;
IRQn_Type irqn;
struct rt_serial_device * serial;
char *device_name;
};
static void uart_isr(struct rt_serial_device *serial);
#if defined(RT_USING_UART1)
struct rt_serial_device serial1;
void LPUART1_IRQHandler(void)
{
uart_isr(&serial1);
}
#endif /* RT_USING_UART1 */
#if defined(RT_USING_UART2)
struct rt_serial_device serial2;
void USART2_IRQHandler(void)
{
uart_isr(&serial2);
}
#endif /* RT_USING_UART2 */
#if defined(RT_USING_UART3)
struct rt_serial_device serial3;
void UART3_IRQHandler(void)
{
uart_isr(&serial3);
}
#endif /* RT_USING_UART3 */
#if defined(RT_USING_UART4)
struct rt_serial_device serial4;
void UART4_IRQHandler(void)
{
uart_isr(&serial4);
}
#endif /* RT_USING_UART4 */
#if defined(RT_USING_UART5)
struct rt_serial_device serial5;
void USART5_IRQHandler(void)
{
uart_isr(&serial5);
}
#endif /* RT_USING_UART5 */
#if defined(RT_USING_UART6)
struct rt_serial_device serial6;
void UART6_IRQHandler(void)
{
uart_isr(&serial6);
}
#endif /* RT_USING_UART6 */
#if defined(RT_USING_UART7)
struct rt_serial_device serial7;
void UART7_IRQHandler(void)
{
uart_isr(&serial7);
}
#endif /* RT_USING_UART7 */
#if defined(RT_USING_UART8)
struct rt_serial_device serial8;
void UART7_IRQHandler(void)
{
uart_isr(&serial8);
}
#endif /* RT_USING_UART8 */
static const struct imxrt_uart uarts[] = {
#ifdef RT_USING_UART1
{
LPUART1,
LPUART1_IRQn,
&serial1,
"uart1",
},
#endif
};
/* Get debug console frequency. */
uint32_t BOARD_DebugConsoleSrcFreq(void)
{
uint32_t freq;
/* To make it simple, we assume default PLL and divider settings, and the only variable
from application is use PLL3 source or OSC source */
if (CLOCK_GetMux(kCLOCK_UartMux) == 0) /* PLL3 div6 80M */
{
freq = (CLOCK_GetPllFreq(kCLOCK_PllUsb1) / 6U) / (CLOCK_GetDiv(kCLOCK_UartDiv) + 1U);
}
else
{
freq = CLOCK_GetOscFreq() / (CLOCK_GetDiv(kCLOCK_UartDiv) + 1U);
}
return freq;
}
/**
* @brief UART MSP Initialization
* This function configures the hardware resources used in this example:
* - Peripheral's clock enable
* - Peripheral's GPIO Configuration
* - NVIC configuration for UART interrupt request enable
* @param huart: UART handle pointer
* @retval None
*/
void imxrt_uart_gpio_init(struct imxrt_uart *uart)
{
if (uart->uart_base == LPUART1)
{
CLOCK_EnableClock(kCLOCK_Iomuxc); /* iomuxc clock (iomuxc_clk_enable): 0x03u */
IOMUXC_SetPinMux(
IOMUXC_GPIO_AD_B0_12_LPUART1_TX, /* GPIO_AD_B0_12 is configured as LPUART1_TX */
0U); /* Software Input On Field: Input Path is determined by functionality */
IOMUXC_SetPinMux(
IOMUXC_GPIO_AD_B0_13_LPUART1_RX, /* GPIO_AD_B0_13 is configured as LPUART1_RX */
0U); /* Software Input On Field: Input Path is determined by functionality */
IOMUXC_SetPinConfig(
IOMUXC_GPIO_AD_B0_12_LPUART1_TX, /* GPIO_AD_B0_12 PAD functional properties : */
0x10B0u); /* Slew Rate Field: Slow Slew Rate
Drive Strength Field: R0/6
Speed Field: medium(100MHz)
Open Drain Enable Field: Open Drain Disabled
Pull / Keep Enable Field: Pull/Keeper Enabled
Pull / Keep Select Field: Keeper
Pull Up / Down Config. Field: 100K Ohm Pull Down
Hyst. Enable Field: Hysteresis Disabled */
IOMUXC_SetPinConfig(
IOMUXC_GPIO_AD_B0_13_LPUART1_RX, /* GPIO_AD_B0_13 PAD functional properties : */
0x10B0u); /* Slew Rate Field: Slow Slew Rate
Drive Strength Field: R0/6
Speed Field: medium(100MHz)
Open Drain Enable Field: Open Drain Disabled
Pull / Keep Enable Field: Pull/Keeper Enabled
Pull / Keep Select Field: Keeper
Pull Up / Down Config. Field: 100K Ohm Pull Down
Hyst. Enable Field: Hysteresis Disabled */
}
else
{
RT_ASSERT(RT_NULL);
}
}
static rt_err_t imxrt_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
struct imxrt_uart *uart;
lpuart_config_t config;
RT_ASSERT(serial != RT_NULL);
RT_ASSERT(cfg != RT_NULL);
uart = (struct imxrt_uart *)serial->parent.user_data;
imxrt_uart_gpio_init(uart);
LPUART_GetDefaultConfig(&config);
config.baudRate_Bps = cfg->baud_rate;
switch (cfg->data_bits)
{
case DATA_BITS_7:
config.dataBitsCount = kLPUART_SevenDataBits;
break;
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;
LPUART_Init(uart->uart_base, &config, BOARD_DebugConsoleSrcFreq());
return RT_EOK;
}
static rt_err_t imxrt_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct imxrt_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct imxrt_uart *)serial->parent.user_data;
switch (cmd)
{
case RT_DEVICE_CTRL_CLR_INT:
/* disable interrupt */
LPUART_DisableInterrupts(uart->uart_base, kLPUART_RxDataRegFullInterruptEnable);
/* disable rx irq */
DisableIRQ(uart->irqn);
break;
case RT_DEVICE_CTRL_SET_INT:
/* enable interrupt */
LPUART_EnableInterrupts(uart->uart_base, kLPUART_RxDataRegFullInterruptEnable);
/* enable rx irq */
EnableIRQ(uart->irqn);
break;
}
return RT_EOK;
}
static int imxrt_putc(struct rt_serial_device *serial, char ch)
{
struct imxrt_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct imxrt_uart *)serial->parent.user_data;
LPUART_WriteByte(uart->uart_base, ch);
while(!(LPUART_GetStatusFlags(uart->uart_base) & kLPUART_TxDataRegEmptyFlag));
return 1;
}
static int imxrt_getc(struct rt_serial_device *serial)
{
int ch;
struct imxrt_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct imxrt_uart *)serial->parent.user_data;
ch = -1;
if (LPUART_GetStatusFlags(uart->uart_base) & kLPUART_RxDataRegFullFlag)
ch = LPUART_ReadByte(uart->uart_base);
return ch;
}
/**
* Uart common interrupt process. This need add to uart ISR.
*
* @param serial serial device
*/
static void uart_isr(struct rt_serial_device *serial)
{
struct imxrt_uart *uart;
LPUART_Type *base;
RT_ASSERT(serial != RT_NULL);
uart = (struct imxrt_uart *) serial->parent.user_data;
RT_ASSERT(uart != RT_NULL);
base = uart->uart_base;
RT_ASSERT(base != RT_NULL);
/* enter interrupt */
rt_interrupt_enter();
/* UART in mode Receiver -------------------------------------------------*/
if (LPUART_GetStatusFlags(base) & kLPUART_RxDataRegFullFlag)
{
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
}
/* If RX overrun. */
if (LPUART_STAT_OR_MASK & base->STAT)
{
/* Clear overrun flag, otherwise the RX does not work. */
base->STAT = ((base->STAT & 0x3FE00000U) | LPUART_STAT_OR_MASK);
}
/* leave interrupt */
rt_interrupt_leave();
}
static const struct rt_uart_ops imxrt_uart_ops =
{
imxrt_configure,
imxrt_control,
imxrt_putc,
imxrt_getc,
};
int imxrt_hw_usart_init(void)
{
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
int i;
for (i = 0; i < sizeof(uarts) / sizeof(uarts[0]); i++)
{
uarts[i].serial->ops = &imxrt_uart_ops;
uarts[i].serial->config = config;
/* register UART1 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;
}
INIT_BOARD_EXPORT(imxrt_hw_usart_init);
#endif /*RT_USING_UART*/
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