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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2013-05-18 Bernard The first version for LPC40xx
* 2014-12-16 RT_learning The first version for LPC5410x
* 2017-08-01 XiaoYang The first version for LPC546xx
* 2018-11-30 yangjie The first version for LPC54114
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#include "fsl_usart.h"
#include "fsl_common.h"
#include "fsl_iocon.h"
struct lpc_uart
{
USART_Type *UART;
IRQn_Type UART_IRQn;
};
static rt_err_t lpc_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
struct lpc_uart *uart;
usart_config_t u0_config;
RT_ASSERT(serial != RT_NULL);
uart = (struct lpc_uart *)serial->parent.user_data;
/*
* config.baudRate_Bps = 115200U;
* config.parityMode = kUSART_ParityDisabled;
* config.stopBitCount = kUSART_OneStopBit;
* config.loopback = false;
* config.enableTx = false;
* config.enableRx = false;
*/
USART_GetDefaultConfig(&u0_config);
u0_config.baudRate_Bps = cfg->baud_rate;
u0_config.parityMode = kUSART_ParityDisabled,
u0_config.stopBitCount = kUSART_OneStopBit,
u0_config.bitCountPerChar = kUSART_8BitsPerChar,
u0_config.loopback = false,
u0_config.txWatermark = kUSART_TxFifo0,
u0_config.rxWatermark = kUSART_RxFifo1,
u0_config.enableTx = true;
u0_config.enableRx = true;
USART_Init(uart->UART, &u0_config, CLOCK_GetFreq(kCLOCK_Flexcomm0));
return RT_EOK;
}
static rt_err_t lpc_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct lpc_uart *uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct lpc_uart *)serial->parent.user_data;
switch (cmd)
{
case RT_DEVICE_CTRL_CLR_INT:
/* disable rx irq */
USART_DisableInterrupts(uart->UART, kUSART_RxLevelInterruptEnable);
break;
case RT_DEVICE_CTRL_SET_INT:
/* enable rx irq */
USART_EnableInterrupts(uart->UART, kUSART_RxLevelInterruptEnable);
break;
}
return RT_EOK;
}
static int lpc_putc(struct rt_serial_device *serial, char c)
{
struct lpc_uart *uart;
uart = (struct lpc_uart *)serial->parent.user_data;
while (!(kUSART_TxFifoNotFullFlag & USART_GetStatusFlags(uart->UART)));
USART_WriteByte(uart->UART, c);
return 1;
}
static int lpc_getc(struct rt_serial_device *serial)
{
struct lpc_uart *uart;
uart = (struct lpc_uart *)serial->parent.user_data;
if (kUSART_RxFifoNotEmptyFlag & USART_GetStatusFlags(uart->UART))
{
return USART_ReadByte(uart->UART);
}
else
return -1;
}
static const struct rt_uart_ops lpc_uart_ops =
{
lpc_configure,
lpc_control,
lpc_putc,
lpc_getc,
};
#define PORT0_IDX 0u /*!< Port index */
#define PIN0_IDX 0u /*!< Pin number for pin 0 */
#define PIN1_IDX 1u /*!< Pin number for pin 1 */
/* UART0 device driver structure */
struct lpc_uart uart0 =
{
USART0,
FLEXCOMM0_IRQn,
};
struct rt_serial_device serial0;
void FLEXCOMM0_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
rt_hw_serial_isr(&serial0, RT_SERIAL_EVENT_RX_IND);
/* leave interrupt */
rt_interrupt_leave();
}
int rt_hw_uart_init(void)
{
struct lpc_uart *uart;
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
#ifdef BSP_USING_UART0
uart = &uart0;
serial0.ops = &lpc_uart_ops;
serial0.config = config;
serial0.parent.user_data = uart;
/* attach 12 MHz clock to FLEXCOMM0 (debug console) */
CLOCK_AttachClk(kFRO12M_to_FLEXCOMM0);
/* reset FLEXCOMM for USART */
RESET_PeripheralReset(kFC0_RST_SHIFT_RSTn);
/* Enables the clock for the IOCON block. 0 = Disable; 1 = Enable.: 0x01u */
CLOCK_EnableClock(kCLOCK_Iocon);
const uint32_t port0_pin0_config = ((IOCON->PIO[PORT0_IDX][PIN0_IDX] &
(~(IOCON_PIO_FUNC_MASK | IOCON_PIO_DIGIMODE_MASK))) /* Mask bits to zero which are setting */
| IOCON_PIO_FUNC(1) /* Selects pin function: PORT00 (pin 31) is configured as FC0_RXD_SDA_MOSI. */
| IOCON_PIO_DIGIMODE(1)); /* Select Analog/Digital mode : Digital mode. */
IOCON_PinMuxSet(IOCON, PORT0_IDX, PIN0_IDX, port0_pin0_config); /* PORT0 PIN0 (coords: 31) is configured as FC0_RXD_SDA_MOSI */
const uint32_t port0_pin1_config = ((IOCON->PIO[PORT0_IDX][PIN1_IDX] &
(~(IOCON_PIO_FUNC_MASK | IOCON_PIO_DIGIMODE_MASK))) /* Mask bits to zero which are setting */
| IOCON_PIO_FUNC(1) /* Selects pin function: PORT01 (pin 32) is configured as FC0_TXD_SCL_MISO. */
| IOCON_PIO_DIGIMODE(1)); /* Select Analog/Digital mode : Digital mode. */
IOCON_PinMuxSet(IOCON, PORT0_IDX, PIN1_IDX, port0_pin1_config); /* PORT0 PIN1 (coords: 32) is configured as FC0_TXD_SCL_MISO */
/* Enable RX interrupt. */
USART_EnableInterrupts(uart->UART, kUSART_RxLevelInterruptEnable | kUSART_RxErrorInterruptEnable);
EnableIRQ(uart->UART_IRQn);
CLOCK_DisableClock(kCLOCK_Iocon);
/* register UART0 device */
rt_hw_serial_register(&serial0, "uart0",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
uart);
#endif
return 0;
}
INIT_BOARD_EXPORT(rt_hw_uart_init);
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