193 lines
6.8 KiB
C
193 lines
6.8 KiB
C
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2013-05-18 Bernard The first version for LPC40xx
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* 2014-12-16 RT_learning The first version for LPC5410x
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* 2017-08-01 XiaoYang The first version for LPC546xx
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include <rtdevice.h>
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#include "fsl_usart.h"
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#include "fsl_common.h"
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#include "fsl_iocon.h"
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struct lpc_uart
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{
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USART_Type *UART;
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IRQn_Type UART_IRQn;
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};
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static rt_err_t lpc_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
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{
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struct lpc_uart *uart;
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usart_config_t u0_config;
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RT_ASSERT(serial != RT_NULL);
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uart = (struct lpc_uart *)serial->parent.user_data;
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/*
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* config.baudRate_Bps = 115200U;
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* config.parityMode = kUSART_ParityDisabled;
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* config.stopBitCount = kUSART_OneStopBit;
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* config.loopback = false;
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* config.enableTx = false;
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* config.enableRx = false;
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*/
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USART_GetDefaultConfig(&u0_config);
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u0_config.baudRate_Bps = cfg->baud_rate;
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u0_config.enableTx = true;
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u0_config.enableRx = true;
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USART_Init(uart->UART, &u0_config, CLOCK_GetFreq(kCLOCK_Flexcomm0));
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return RT_EOK;
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}
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static rt_err_t lpc_control(struct rt_serial_device *serial, int cmd, void *arg)
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{
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struct lpc_uart *uart;
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RT_ASSERT(serial != RT_NULL);
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uart = (struct lpc_uart *)serial->parent.user_data;
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switch (cmd)
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{
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case RT_DEVICE_CTRL_CLR_INT:
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/* disable rx irq */
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USART_DisableInterrupts(uart->UART, kUSART_RxLevelInterruptEnable);
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break;
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case RT_DEVICE_CTRL_SET_INT:
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/* enable rx irq */
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USART_EnableInterrupts(uart->UART, kUSART_RxLevelInterruptEnable);
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break;
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}
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return RT_EOK;
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}
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static int lpc_putc(struct rt_serial_device *serial, char c)
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{
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struct lpc_uart *uart;
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uart = (struct lpc_uart *)serial->parent.user_data;
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while (!(kUSART_TxFifoNotFullFlag & USART_GetStatusFlags(uart->UART)));
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USART_WriteByte(uart->UART, c);
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return 1;
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}
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static int lpc_getc(struct rt_serial_device *serial)
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{
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struct lpc_uart *uart;
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uart = (struct lpc_uart *)serial->parent.user_data;
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if (kUSART_RxFifoNotEmptyFlag & USART_GetStatusFlags(uart->UART))
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{
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return USART_ReadByte(uart->UART);
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}
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else
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return -1;
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}
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static const struct rt_uart_ops lpc_uart_ops =
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{
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lpc_configure,
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lpc_control,
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lpc_putc,
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lpc_getc,
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};
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#define IOCON_PIO_DIGITAL_EN 0x0100u /*!< Enables digital function */
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#define IOCON_PIO_FUNC1 0x01u /*!< Selects pin function 1 */
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#define IOCON_PIO_INPFILT_OFF 0x0200u /*!< Input filter disabled */
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#define IOCON_PIO_INV_DI 0x00u /*!< Input function is not inverted */
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#define IOCON_PIO_MODE_INACT 0x00u /*!< No addition pin function */
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#define IOCON_PIO_OPENDRAIN_DI 0x00u /*!< Open drain is disabled */
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#define IOCON_PIO_SLEW_STANDARD 0x00u /*!< Standard mode, output slew rate control is enabled */
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#define PIN29_IDX 29u /*!< Pin number for pin 29 in a port 0 */
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#define PIN30_IDX 30u /*!< Pin number for pin 30 in a port 0 */
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#define PORT0_IDX 0u /*!< Port index */
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/* UART0 device driver structure */
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struct lpc_uart uart0 =
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{
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USART0,
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FLEXCOMM0_IRQn,
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};
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struct rt_serial_device serial0;
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void FLEXCOMM0_IRQHandler(void)
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{
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/* enter interrupt */
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rt_interrupt_enter();
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rt_hw_serial_isr(&serial0, RT_SERIAL_EVENT_RX_IND);
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/* leave interrupt */
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rt_interrupt_leave();
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}
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void rt_hw_uart_init(void)
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{
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struct lpc_uart *uart;
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struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
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#ifdef RT_USING_UART0
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uart = &uart0;
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serial0.ops = &lpc_uart_ops;
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serial0.config = config;
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serial0.parent.user_data = uart;
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/* attach 12 MHz clock to FLEXCOMM0 (debug console) */
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CLOCK_AttachClk(kFRO12M_to_FLEXCOMM0);
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/* Enables the clock for the IOCON block. 0 = Disable; 1 = Enable.: 0x01u */
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// CLOCK_EnableClock(kCLOCK_Iocon);
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{
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const uint32_t port0_pin29_config = (
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IOCON_PIO_FUNC1 | /* Pin is configured as FC0_RXD_SDA_MOSI */
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IOCON_PIO_MODE_INACT | /* No addition pin function */
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IOCON_PIO_INV_DI | /* Input function is not inverted */
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IOCON_PIO_DIGITAL_EN | /* Enables digital function */
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IOCON_PIO_INPFILT_OFF | /* Input filter disabled */
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IOCON_PIO_SLEW_STANDARD | /* Standard mode, output slew rate control is enabled */
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IOCON_PIO_OPENDRAIN_DI /* Open drain is disabled */
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);
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IOCON_PinMuxSet(IOCON, PORT0_IDX, PIN29_IDX, port0_pin29_config); /* PORT0 PIN29 (coords: B13) is configured as FC0_RXD_SDA_MOSI */
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const uint32_t port0_pin30_config = (
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IOCON_PIO_FUNC1 | /* Pin is configured as FC0_TXD_SCL_MISO */
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IOCON_PIO_MODE_INACT | /* No addition pin function */
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IOCON_PIO_INV_DI | /* Input function is not inverted */
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IOCON_PIO_DIGITAL_EN | /* Enables digital function */
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IOCON_PIO_INPFILT_OFF | /* Input filter disabled */
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IOCON_PIO_SLEW_STANDARD | /* Standard mode, output slew rate control is enabled */
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IOCON_PIO_OPENDRAIN_DI /* Open drain is disabled */
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);
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IOCON_PinMuxSet(IOCON, PORT0_IDX, PIN30_IDX, port0_pin30_config); /* PORT0 PIN30 (coords: A2) is configured as FC0_TXD_SCL_MISO */
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}
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/* Enable RX interrupt. */
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USART_EnableInterrupts(uart->UART, kUSART_RxLevelInterruptEnable);
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EnableIRQ(uart->UART_IRQn);
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/* register UART0 device */
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rt_hw_serial_register(&serial0, "uart0",
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RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
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uart);
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#endif
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}
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