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/**************************************************************************//**
*
* @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-9-27 Wayne First version
*
******************************************************************************/
#include <rtconfig.h>
#if defined(BSP_USING_SCUART)
#include "NuMicro.h"
#include <rtdevice.h>
#include <rthw.h>
#include <drv_sys.h>
/* 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 <rtdbg.h>
enum
{
SCUART_START = -1,
#if defined(BSP_USING_SCUART0)
SCUART0_IDX,
#endif
#if defined(BSP_USING_SCUART1)
SCUART1_IDX,
#endif
SCUART_CNT
};
/* Private typedef
* --------------------------------------------------------------*/
struct nu_scuart
{
rt_serial_t dev;
char *name;
SC_T *base;
IRQn_Type irqn;
uint32_t rstidx;
uint32_t modid;
};
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(int vector, void *param);
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", .base = SC0, .irqn = SC0_IRQn, .rstidx = SC0_RST, .modid = SC0_MODULE,
},
#endif
#if defined(BSP_USING_SCUART1)
{
.name = "scuart1", .base = SC1, .irqn = SC1_IRQn, .rstidx = SC1_RST, .modid = SC1_MODULE,
},
#endif
}; /* scuart nu_scuart */
/**
* All SCUART interrupt service routine
*/
static void nu_scuart_isr(int vector, void *param)
{
nu_scuart_t psNuSCUart = (nu_scuart_t)param;
/* Handle RX event */
if (SCUART_GET_INT_FLAG(psNuSCUart->base, SC_INTSTS_RXTOIF_Msk) ||
SCUART_GET_INT_FLAG(psNuSCUart->base, SC_INTSTS_RDAIF_Msk))
{
rt_hw_serial_isr(&psNuSCUart->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_CLR_INT_FLAG(psNuSCUart->base, 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;
nu_scuart_t psNuSCUart = (nu_scuart_t)serial;
RT_ASSERT(psNuSCUart);
/* Check baud rate */
RT_ASSERT(cfg->baud_rate);
/* 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;
}
nu_sys_ip_reset(psNuSCUart->rstidx);
/* Open SCUART and set SCUART baud rate */
SCUART_Open(psNuSCUart->base, cfg->baud_rate);
/* Set line configuration. */
SCUART_SetLineConfig(psNuSCUart->base, 0, scuart_word_len, scuart_parity,
scuart_stop_bit);
/* Enable interrupt. */
rt_hw_interrupt_umask(psNuSCUart->irqn);
exit_nu_scuart_configure:
if (ret != RT_EOK)
SCUART_Close(psNuSCUart->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;
nu_scuart_t psNuSCUart = (nu_scuart_t)serial;
RT_ASSERT(psNuSCUart);
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(psNuSCUart->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(psNuSCUart->base, flag);
}
break;
case RT_DEVICE_CTRL_CLOSE:
/* Disable interrupt. */
rt_hw_interrupt_mask(psNuSCUart->irqn);
/* Close SCUART port */
SCUART_Close(psNuSCUart->base);
break;
default:
result = -RT_EINVAL;
break;
}
return result;
}
/**
* SCUART put char
*/
static int nu_scuart_send(struct rt_serial_device *serial, char c)
{
nu_scuart_t psNuSCUart = (nu_scuart_t)serial;
RT_ASSERT(psNuSCUart);
/* Waiting if TX-FIFO is full. */
while (SCUART_IS_TX_FULL(psNuSCUart->base)) ;
/* Put char into TX-FIFO */
SCUART_WRITE(psNuSCUart->base, c);
return 1;
}
/**
* SCUART get char
*/
static int nu_scuart_receive(struct rt_serial_device *serial)
{
nu_scuart_t psNuSCUart = (nu_scuart_t)serial;
RT_ASSERT(psNuSCUart);
/* Return failure if RX-FIFO is empty. */
if (SCUART_GET_RX_EMPTY(psNuSCUart->base))
{
return -1;
}
/* Get char from RX-FIFO */
return SCUART_READ(psNuSCUart->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;
SYS_ResetModule(nu_scuart_arr[i].rstidx);
rt_hw_interrupt_install(nu_scuart_arr[i].irqn, nu_scuart_isr, &nu_scuart_arr[i], nu_scuart_arr[i].name);
ret = rt_hw_serial_register(&nu_scuart_arr[i].dev, nu_scuart_arr[i].name, flag, NULL);
RT_ASSERT(ret == RT_EOK);
}
return (int)ret;
}
INIT_DEVICE_EXPORT(rt_hw_scuart_init);
#endif //#if defined(BSP_USING_SCUART)
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