392 lines
9.1 KiB
C
392 lines
9.1 KiB
C
/**************************************************************************//**
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*
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* @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
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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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* 2020-7-31 Egbert First version
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*
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******************************************************************************/
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#include <rtconfig.h>
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#if defined(BSP_USING_SCUART)
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#include "NuMicro.h"
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#include <rtdevice.h>
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#include <rthw.h>
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/* Private definition ---------------------------------------------------------------*/
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#define LOG_TAG "drv.scuart"
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#define DBG_ENABLE
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#define DBG_SECTION_NAME "drv.scuart"
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#define DBG_LEVEL DBG_ERROR
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#define DBG_COLOR
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#include <rtdbg.h>
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enum
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{
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SCUART_START = -1,
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#if defined(BSP_USING_SCUART0)
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SCUART0_IDX,
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#endif
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#if defined(BSP_USING_SCUART1)
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SCUART1_IDX,
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#endif
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#if defined(BSP_USING_SCUART2)
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SCUART2_IDX,
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#endif
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SCUART_CNT
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};
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/* Private typedef --------------------------------------------------------------*/
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struct nu_scuart
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{
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rt_serial_t dev;
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char *name;
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SC_T *scuart_base;
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uint32_t scuart_rst;
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IRQn_Type scuart_irq_n;
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};
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typedef struct nu_scuart *nu_scuart_t;
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/* Private functions ------------------------------------------------------------*/
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static rt_err_t nu_scuart_configure(struct rt_serial_device *serial, struct serial_configure *cfg);
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static rt_err_t nu_scuart_control(struct rt_serial_device *serial, int cmd, void *arg);
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static int nu_scuart_send(struct rt_serial_device *serial, char c);
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static int nu_scuart_receive(struct rt_serial_device *serial);
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static void nu_scuart_isr(nu_scuart_t serial);
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/* Public functions ------------------------------------------------------------*/
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/* Private variables ------------------------------------------------------------*/
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static const struct rt_uart_ops nu_scuart_ops =
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{
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.configure = nu_scuart_configure,
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.control = nu_scuart_control,
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.putc = nu_scuart_send,
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.getc = nu_scuart_receive,
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.dma_transmit = RT_NULL /* not support DMA mode */
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};
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static const struct serial_configure nu_scuart_default_config =
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RT_SERIAL_CONFIG_DEFAULT;
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static struct nu_scuart nu_scuart_arr [] =
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{
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#if defined(BSP_USING_SCUART0)
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{
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.name = "scuart0",
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.scuart_base = SC0,
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.scuart_rst = SC0_RST,
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.scuart_irq_n = SC0_IRQn,
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},
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#endif
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#if defined(BSP_USING_SCUART1)
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{
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.name = "scuart1",
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.scuart_base = SC1,
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.scuart_rst = SC1_RST,
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.scuart_irq_n = SC1_IRQn,
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},
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#endif
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#if defined(BSP_USING_SCUART2)
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{
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.name = "scuart2",
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.scuart_base = SC2,
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.scuart_rst = SC2_RST,
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.scuart_irq_n = SC2_IRQn,
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},
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#endif
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{0}
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}; /* scuart nu_scuart */
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/* Interrupt Handle Function ----------------------------------------------------*/
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#if defined(BSP_USING_SCUART0)
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/* SCUART0 interrupt entry */
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void SC0_IRQHandler(void)
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{
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/* enter interrupt */
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rt_interrupt_enter();
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nu_scuart_isr(&nu_scuart_arr[SCUART0_IDX]);
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/* leave interrupt */
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rt_interrupt_leave();
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}
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#endif
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#if defined(BSP_USING_SCUART1)
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/* SCUART1 interrupt entry */
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void SC1_IRQHandler(void)
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{
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/* enter interrupt */
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rt_interrupt_enter();
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nu_scuart_isr(&nu_scuart_arr[SCUART1_IDX]);
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/* leave interrupt */
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rt_interrupt_leave();
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}
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#endif
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#if defined(BSP_USING_SCUART2)
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/* SCUART2 interrupt entry */
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void SC2_IRQHandler(void)
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{
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/* enter interrupt */
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rt_interrupt_enter();
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nu_scuart_isr(&nu_scuart_arr[SCUART2_IDX]);
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/* leave interrupt */
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rt_interrupt_leave();
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}
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#endif
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/**
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* All SCUART interrupt service routine
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*/
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static void nu_scuart_isr(nu_scuart_t serial)
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{
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/* Get base address of scuart register */
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SC_T *scuart_base = ((nu_scuart_t)serial)->scuart_base;
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/* Get interrupt event */
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uint32_t u32IntSts = scuart_base->INTSTS;
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/* Handle RX event */
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if (u32IntSts & (SC_INTSTS_RDAIF_Msk | SC_INTSTS_RXTOIF_Msk))
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{
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rt_hw_serial_isr(&serial->dev, RT_SERIAL_EVENT_RX_IND);
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// RDA is the only interrupt enabled in this driver, this status bit
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// automatically cleared after Rx FIFO empty. So no need to clear interrupt
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// status here.
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scuart_base->INTSTS = SC_INTSTS_RXTOIF_Msk;
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}
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}
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/**
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* Configure scuart port
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*/
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static rt_err_t nu_scuart_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
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{
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rt_err_t ret = RT_EOK;
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uint32_t scuart_word_len = 0;
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uint32_t scuart_stop_bit = 0;
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uint32_t scuart_parity = 0;
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/* Get base address of scuart register */
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SC_T *scuart_base = ((nu_scuart_t)serial)->scuart_base;
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/* Check baudrate */
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RT_ASSERT(cfg->baud_rate != 0);
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/* Check word len */
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switch (cfg->data_bits)
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{
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case DATA_BITS_5:
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scuart_word_len = SCUART_CHAR_LEN_5;
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break;
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case DATA_BITS_6:
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scuart_word_len = SCUART_CHAR_LEN_6;
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break;
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case DATA_BITS_7:
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scuart_word_len = SCUART_CHAR_LEN_7;
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break;
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case DATA_BITS_8:
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scuart_word_len = SCUART_CHAR_LEN_8;
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break;
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default:
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LOG_E("Unsupported data length");
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ret = RT_EINVAL;
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goto exit_nu_scuart_configure;
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}
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/* Check stop bit */
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switch (cfg->stop_bits)
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{
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case STOP_BITS_1:
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scuart_stop_bit = SCUART_STOP_BIT_1;
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break;
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case STOP_BITS_2:
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scuart_stop_bit = SCUART_STOP_BIT_2;
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break;
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default:
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LOG_E("Unsupported stop bit");
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ret = RT_EINVAL;
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goto exit_nu_scuart_configure;
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}
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/* Check parity */
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switch (cfg->parity)
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{
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case PARITY_NONE:
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scuart_parity = SCUART_PARITY_NONE;
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break;
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case PARITY_ODD:
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scuart_parity = SCUART_PARITY_ODD;
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break;
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case PARITY_EVEN:
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scuart_parity = SCUART_PARITY_EVEN;
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break;
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default:
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LOG_E("Unsupported parity");
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ret = RT_EINVAL;
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goto exit_nu_scuart_configure;
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}
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/* Reset this module */
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SYS_ResetModule(((nu_scuart_t)serial)->scuart_rst);
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/* Open SCUART and set SCUART Baudrate */
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SCUART_Open(scuart_base, cfg->baud_rate);
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/* Set line configuration. */
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SCUART_SetLineConfig(scuart_base, 0, scuart_word_len, scuart_parity, scuart_stop_bit);
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/* Enable NVIC interrupt. */
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NVIC_EnableIRQ(((nu_scuart_t)serial)->scuart_irq_n);
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exit_nu_scuart_configure:
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if (ret != RT_EOK)
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SCUART_Close(scuart_base);
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return -(ret);
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}
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/**
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* SCUART interrupt control
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*/
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static rt_err_t nu_scuart_control(struct rt_serial_device *serial, int cmd, void *arg)
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{
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rt_err_t result = RT_EOK;
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rt_uint32_t flag;
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rt_ubase_t ctrl_arg = (rt_ubase_t)arg;
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RT_ASSERT(serial != RT_NULL);
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/* Get base address of scuart register */
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SC_T *scuart_base = ((nu_scuart_t)serial)->scuart_base;
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switch (cmd)
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{
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case RT_DEVICE_CTRL_CLR_INT:
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if (ctrl_arg == RT_DEVICE_FLAG_INT_RX) /* Disable INT-RX */
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{
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flag = SC_INTEN_RDAIEN_Msk | SC_INTEN_RXTOIEN_Msk;
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SCUART_DISABLE_INT(scuart_base, flag);
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}
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break;
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case RT_DEVICE_CTRL_SET_INT:
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if (ctrl_arg == RT_DEVICE_FLAG_INT_RX) /* Enable INT-RX */
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{
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flag = SC_INTEN_RDAIEN_Msk | SC_INTEN_RXTOIEN_Msk;
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SCUART_ENABLE_INT(scuart_base, flag);
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}
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break;
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case RT_DEVICE_CTRL_CLOSE:
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/* Disable NVIC interrupt. */
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NVIC_DisableIRQ(((nu_scuart_t)serial)->scuart_irq_n);
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/* Reset this module */
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SYS_ResetModule(((nu_scuart_t)serial)->scuart_rst);
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/* Close SCUART port */
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SCUART_Close(scuart_base);
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break;
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default:
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result = -RT_EINVAL;
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break;
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}
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return result;
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}
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/**
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* SCUART put char
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*/
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static int nu_scuart_send(struct rt_serial_device *serial, char c)
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{
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RT_ASSERT(serial != RT_NULL);
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/* Get base address of scuart register */
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SC_T *scuart_base = ((nu_scuart_t)serial)->scuart_base;
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/* Waiting if TX-FIFO is full. */
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while (SCUART_IS_TX_FULL(scuart_base));
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/* Put char into TX-FIFO */
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SCUART_WRITE(scuart_base, c);
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return 1;
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}
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/**
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* SCUART get char
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*/
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static int nu_scuart_receive(struct rt_serial_device *serial)
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{
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RT_ASSERT(serial != RT_NULL);
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/* Get base address of scuart register */
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SC_T *scuart_base = ((nu_scuart_t)serial)->scuart_base;
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/* Return failure if RX-FIFO is empty. */
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if (SCUART_GET_RX_EMPTY(scuart_base))
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{
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return -1;
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}
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/* Get char from RX-FIFO */
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return SCUART_READ(scuart_base);
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}
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/**
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* Hardware SCUART Initialization
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*/
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static int rt_hw_scuart_init(void)
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{
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int i;
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rt_uint32_t flag;
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rt_err_t ret = RT_EOK;
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for (i = (SCUART_START + 1); i < SCUART_CNT; i++)
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{
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flag = RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX;
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nu_scuart_arr[i].dev.ops = &nu_scuart_ops;
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nu_scuart_arr[i].dev.config = nu_scuart_default_config;
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ret = rt_hw_serial_register(&nu_scuart_arr[i].dev, nu_scuart_arr[i].name, flag, NULL);
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RT_ASSERT(ret == RT_EOK);
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}
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return ret;
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}
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INIT_DEVICE_EXPORT(rt_hw_scuart_init);
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#endif //#if defined(BSP_USING_SCUART)
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