/**************************************************************************//** * * @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved. * * SPDX-License-Identifier: Apache-2.0 * * Change Logs: * Date Author Notes * 2020-7-21 Egbert First version * ******************************************************************************/ #include #if defined(BSP_USING_SCUART) #include #include #include /* Private definition * ---------------------------------------------------------------*/ #define LOG_TAG "drv.scuart" #define DBG_ENABLE #define DBG_SECTION_NAME "drv.scuart" #define DBG_LEVEL DBG_ERROR #define DBG_COLOR #include enum { SCUART_START = -1, #if defined(BSP_USING_SCUART0) SCUART0_IDX, #endif #if defined(BSP_USING_SCUART1) SCUART1_IDX, #endif #if defined(BSP_USING_SCUART2) SCUART2_IDX, #endif SCUART_CNT }; /* Private typedef * --------------------------------------------------------------*/ struct nu_scuart { rt_serial_t dev; char *name; SC_T *scuart_base; uint32_t scuart_rst; IRQn_Type scuart_irq_n; }; typedef struct nu_scuart *nu_scuart_t; /* Private functions * ------------------------------------------------------------*/ static rt_err_t nu_scuart_configure(struct rt_serial_device *serial, struct serial_configure *cfg); static rt_err_t nu_scuart_control(struct rt_serial_device *serial, int cmd, void *arg); static int nu_scuart_send(struct rt_serial_device *serial, char c); static int nu_scuart_receive(struct rt_serial_device *serial); static void nu_scuart_isr(nu_scuart_t serial); static const struct rt_uart_ops nu_scuart_ops = { .configure = nu_scuart_configure, .control = nu_scuart_control, .putc = nu_scuart_send, .getc = nu_scuart_receive, .dma_transmit = RT_NULL /* not support DMA mode */ }; static const struct serial_configure nu_scuart_default_config = RT_SERIAL_CONFIG_DEFAULT; static struct nu_scuart nu_scuart_arr[] = { #if defined(BSP_USING_SCUART0) { .name = "scuart0", .scuart_base = SC0, .scuart_rst = SC0_RST, .scuart_irq_n = SC0_IRQn, }, #endif #if defined(BSP_USING_SCUART1) { .name = "scuart1", .scuart_base = SC1, .scuart_rst = SC1_RST, .scuart_irq_n = SC1_IRQn, }, #endif #if defined(BSP_USING_SCUART2) { .name = "scuart2", .scuart_base = SC2, .scuart_rst = SC2_RST, .scuart_irq_n = SC2_IRQn, }, #endif {0} }; /* scuart nu_scuart */ /* Interrupt Handle Function * ----------------------------------------------------*/ #if defined(BSP_USING_SCUART0) /* SCUART0 interrupt entry */ void SC0_IRQHandler(void) { /* enter interrupt */ rt_interrupt_enter(); nu_scuart_isr(&nu_scuart_arr[SCUART0_IDX]); /* leave interrupt */ rt_interrupt_leave(); } #endif #if defined(BSP_USING_SCUART1) /* SCUART1 interrupt entry */ void SC1_IRQHandler(void) { /* enter interrupt */ rt_interrupt_enter(); nu_scuart_isr(&nu_scuart_arr[SCUART1_IDX]); /* leave interrupt */ rt_interrupt_leave(); } #endif #if defined(BSP_USING_SCUART2) /* SCUART2 interrupt entry */ void SC2_IRQHandler(void) { /* enter interrupt */ rt_interrupt_enter(); nu_scuart_isr(&nu_scuart_arr[SCUART2_IDX]); /* leave interrupt */ rt_interrupt_leave(); } #endif /** * All SCUART interrupt service routine */ static void nu_scuart_isr(nu_scuart_t serial) { /* Get base address of scuart register */ SC_T *scuart_base = ((nu_scuart_t)serial)->scuart_base; /* Get interrupt event */ uint32_t u32IntSts = scuart_base->INTSTS; /* Handle RX event */ if (u32IntSts & (SC_INTSTS_RDAIF_Msk | SC_INTSTS_RXTOIF_Msk)) { rt_hw_serial_isr(&serial->dev, RT_SERIAL_EVENT_RX_IND); // RDA is the only interrupt enabled in this driver, this status bit // automatically cleared after Rx FIFO empty. So no need to clear interrupt // status here. scuart_base->INTSTS = SC_INTSTS_RXTOIF_Msk; } } /** * Configure scuart port */ static rt_err_t nu_scuart_configure(struct rt_serial_device *serial, struct serial_configure *cfg) { rt_err_t ret = RT_EOK; uint32_t scuart_word_len = 0; uint32_t scuart_stop_bit = 0; uint32_t scuart_parity = 0; /* Get base address of scuart register */ SC_T *scuart_base = ((nu_scuart_t)serial)->scuart_base; /* Check baud rate */ RT_ASSERT(cfg->baud_rate != 0); /* Check word len */ switch (cfg->data_bits) { case DATA_BITS_5: scuart_word_len = SCUART_CHAR_LEN_5; break; case DATA_BITS_6: scuart_word_len = SCUART_CHAR_LEN_6; break; case DATA_BITS_7: scuart_word_len = SCUART_CHAR_LEN_7; break; case DATA_BITS_8: scuart_word_len = SCUART_CHAR_LEN_8; break; default: LOG_E("Unsupported data length"); ret = RT_EINVAL; goto exit_nu_scuart_configure; } /* Check stop bit */ switch (cfg->stop_bits) { case STOP_BITS_1: scuart_stop_bit = SCUART_STOP_BIT_1; break; case STOP_BITS_2: scuart_stop_bit = SCUART_STOP_BIT_2; break; default: LOG_E("Unsupported stop bit"); ret = RT_EINVAL; goto exit_nu_scuart_configure; } /* Check parity */ switch (cfg->parity) { case PARITY_NONE: scuart_parity = SCUART_PARITY_NONE; break; case PARITY_ODD: scuart_parity = SCUART_PARITY_ODD; break; case PARITY_EVEN: scuart_parity = SCUART_PARITY_EVEN; break; default: LOG_E("Unsupported parity"); ret = RT_EINVAL; goto exit_nu_scuart_configure; } /* Reset this module */ SYS_ResetModule(((nu_scuart_t)serial)->scuart_rst); /* Open SCUART and set SCUART baud rate */ SCUART_Open(scuart_base, cfg->baud_rate); /* Set line configuration. */ SCUART_SetLineConfig(scuart_base, 0, scuart_word_len, scuart_parity, scuart_stop_bit); /* Enable NVIC interrupt. */ NVIC_EnableIRQ(((nu_scuart_t)serial)->scuart_irq_n); exit_nu_scuart_configure: if (ret != RT_EOK) SCUART_Close(scuart_base); return -(ret); } /** * SCUART interrupt control */ static rt_err_t nu_scuart_control(struct rt_serial_device *serial, int cmd, void *arg) { rt_err_t result = RT_EOK; rt_uint32_t flag; rt_ubase_t ctrl_arg = (rt_ubase_t)arg; RT_ASSERT(serial != RT_NULL); /* Get base address of scuart register */ SC_T *scuart_base = ((nu_scuart_t)serial)->scuart_base; switch (cmd) { case RT_DEVICE_CTRL_CLR_INT: if (ctrl_arg == RT_DEVICE_FLAG_INT_RX) /* Disable INT-RX */ { flag = SC_INTEN_RDAIEN_Msk | SC_INTEN_RXTOIEN_Msk; SCUART_DISABLE_INT(scuart_base, flag); } break; case RT_DEVICE_CTRL_SET_INT: if (ctrl_arg == RT_DEVICE_FLAG_INT_RX) /* Enable INT-RX */ { flag = SC_INTEN_RDAIEN_Msk | SC_INTEN_RXTOIEN_Msk; SCUART_ENABLE_INT(scuart_base, flag); } break; case RT_DEVICE_CTRL_CLOSE: /* Disable NVIC interrupt. */ NVIC_DisableIRQ(((nu_scuart_t)serial)->scuart_irq_n); /* Reset this module */ SYS_ResetModule(((nu_scuart_t)serial)->scuart_rst); /* Close SCUART port */ SCUART_Close(scuart_base); break; default: result = -RT_EINVAL; break; } return result; } /** * SCUART put char */ static int nu_scuart_send(struct rt_serial_device *serial, char c) { RT_ASSERT(serial != RT_NULL); /* Get base address of scuart register */ SC_T *scuart_base = ((nu_scuart_t)serial)->scuart_base; /* Waiting if TX-FIFO is full. */ while (SCUART_IS_TX_FULL(scuart_base)) ; /* Put char into TX-FIFO */ SCUART_WRITE(scuart_base, c); return 1; } /** * SCUART get char */ static int nu_scuart_receive(struct rt_serial_device *serial) { RT_ASSERT(serial != RT_NULL); /* Get base address of scuart register */ SC_T *scuart_base = ((nu_scuart_t)serial)->scuart_base; /* Return failure if RX-FIFO is empty. */ if (SCUART_GET_RX_EMPTY(scuart_base)) { return -1; } /* Get char from RX-FIFO */ return SCUART_READ(scuart_base); } /** * Hardware SCUART Initialization */ static int rt_hw_scuart_init(void) { int i; rt_uint32_t flag; rt_err_t ret = RT_EOK; for (i = (SCUART_START + 1); i < SCUART_CNT; i++) { flag = RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX; nu_scuart_arr[i].dev.ops = &nu_scuart_ops; nu_scuart_arr[i].dev.config = nu_scuart_default_config; ret = rt_hw_serial_register(&nu_scuart_arr[i].dev, nu_scuart_arr[i].name, flag, NULL); RT_ASSERT(ret == RT_EOK); } return ret; } INIT_DEVICE_EXPORT(rt_hw_scuart_init); #endif //#if defined(BSP_USING_SCUART)