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/*
* Copyright (c) 2006-2026, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <rtdevice.h>
#include "drv_uart.h"
#include "fsl_clock.h"
#include "fsl_lpuart.h"
#if defined(RT_USING_SERIAL) && \
(defined(BSP_USING_UART0) || defined(BSP_USING_UART1) || defined(BSP_USING_UART2))
struct mcxc162_uart
{
struct rt_serial_device serial;
LPUART_Type *base;
IRQn_Type irqn;
clock_attach_id_t clock_attach;
clock_div_name_t clock_div;
rt_uint8_t instance;
const char *name;
};
static void mcxc162_uart_isr(struct mcxc162_uart *uart);
#ifdef BSP_USING_UART0
static struct mcxc162_uart uart0 = {
.base = LPUART0,
.irqn = LPUART0_IRQn,
.clock_attach = kFRO_LF_DIV_to_LPUART0,
.clock_div = kCLOCK_DivLPUART0,
.instance = 0U,
.name = "uart0",
};
void LPUART0_IRQHandler(void)
{
mcxc162_uart_isr(&uart0);
}
#endif
#ifdef BSP_USING_UART1
static struct mcxc162_uart uart1 = {
.base = LPUART1,
.irqn = LPUART1_IRQn,
.clock_attach = kFRO_LF_DIV_to_LPUART1,
.clock_div = kCLOCK_DivLPUART1,
.instance = 1U,
.name = "uart1",
};
void LPUART1_IRQHandler(void)
{
mcxc162_uart_isr(&uart1);
}
#endif
#ifdef BSP_USING_UART2
static struct mcxc162_uart uart2 = {
.base = LPUART2,
.irqn = LPUART2_IRQn,
.clock_attach = kFRO_LF_DIV_to_LPUART2,
.clock_div = kCLOCK_DivLPUART2,
.instance = 2U,
.name = "uart2",
};
void LPUART2_IRQHandler(void)
{
mcxc162_uart_isr(&uart2);
}
#endif
static struct mcxc162_uart * const uarts[] = {
#ifdef BSP_USING_UART0
&uart0,
#endif
#ifdef BSP_USING_UART1
&uart1,
#endif
#ifdef BSP_USING_UART2
&uart2,
#endif
};
static rt_err_t mcxc162_uart_configure(struct rt_serial_device *serial,
struct serial_configure *cfg)
{
struct mcxc162_uart *uart = serial->parent.user_data;
lpuart_config_t config;
LPUART_GetDefaultConfig(&config);
config.baudRate_Bps = cfg->baud_rate;
config.enableTx = true;
config.enableRx = true;
config.isMsb = cfg->bit_order == BIT_ORDER_MSB;
if (cfg->invert != NRZ_NORMAL || cfg->flowcontrol != RT_SERIAL_FLOWCONTROL_NONE)
{
return -RT_EINVAL;
}
switch (cfg->data_bits)
{
case DATA_BITS_7:
config.dataBitsCount = kLPUART_SevenDataBits;
break;
case DATA_BITS_8:
config.dataBitsCount = kLPUART_EightDataBits;
break;
default:
return -RT_EINVAL;
}
switch (cfg->stop_bits)
{
case STOP_BITS_1:
config.stopBitCount = kLPUART_OneStopBit;
break;
case STOP_BITS_2:
config.stopBitCount = kLPUART_TwoStopBit;
break;
default:
return -RT_EINVAL;
}
switch (cfg->parity)
{
case PARITY_NONE:
config.parityMode = kLPUART_ParityDisabled;
break;
case PARITY_ODD:
config.parityMode = kLPUART_ParityOdd;
break;
case PARITY_EVEN:
config.parityMode = kLPUART_ParityEven;
break;
default:
return -RT_EINVAL;
}
CLOCK_SetClockDiv(uart->clock_div, 1U);
CLOCK_AttachClk(uart->clock_attach);
if (LPUART_Init(uart->base, &config,
CLOCK_GetLpuartClkFreq(uart->instance)) != kStatus_Success)
{
return -RT_ERROR;
}
if ((serial->parent.open_flag & RT_DEVICE_FLAG_INT_RX) != 0U)
{
LPUART_EnableInterrupts(uart->base, kLPUART_RxDataRegFullInterruptEnable);
NVIC_ClearPendingIRQ(uart->irqn);
EnableIRQ(uart->irqn);
}
return RT_EOK;
}
static rt_err_t mcxc162_uart_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct mcxc162_uart *uart = serial->parent.user_data;
(void)arg;
switch (cmd)
{
case RT_DEVICE_CTRL_CLR_INT:
LPUART_DisableInterrupts(uart->base, kLPUART_RxDataRegFullInterruptEnable);
DisableIRQ(uart->irqn);
break;
case RT_DEVICE_CTRL_SET_INT:
LPUART_EnableInterrupts(uart->base, kLPUART_RxDataRegFullInterruptEnable);
EnableIRQ(uart->irqn);
break;
default:
break;
}
return RT_EOK;
}
static int mcxc162_uart_putc(struct rt_serial_device *serial, char ch)
{
struct mcxc162_uart *uart = serial->parent.user_data;
while ((LPUART_GetStatusFlags(uart->base) & kLPUART_TxDataRegEmptyFlag) == 0U)
{
}
LPUART_WriteByte(uart->base, (uint8_t)ch);
return 1;
}
static int mcxc162_uart_getc(struct rt_serial_device *serial)
{
struct mcxc162_uart *uart = serial->parent.user_data;
if ((LPUART_GetStatusFlags(uart->base) & kLPUART_RxDataRegFullFlag) != 0U)
{
return LPUART_ReadByte(uart->base);
}
return -1;
}
static void mcxc162_uart_isr(struct mcxc162_uart *uart)
{
uint32_t status;
uint32_t errors = kLPUART_RxOverrunFlag | kLPUART_NoiseErrorFlag |
kLPUART_FramingErrorFlag | kLPUART_ParityErrorFlag;
rt_interrupt_enter();
status = LPUART_GetStatusFlags(uart->base);
if ((status & kLPUART_RxDataRegFullFlag) != 0U)
{
rt_hw_serial_isr(&uart->serial, RT_SERIAL_EVENT_RX_IND);
}
if ((status & errors) != 0U)
{
LPUART_ClearStatusFlags(uart->base, status & errors);
}
rt_interrupt_leave();
}
static const struct rt_uart_ops mcxc162_uart_ops = {
.configure = mcxc162_uart_configure,
.control = mcxc162_uart_control,
.putc = mcxc162_uart_putc,
.getc = mcxc162_uart_getc,
};
int rt_hw_uart_init(void)
{
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
rt_uint32_t i;
rt_err_t result;
for (i = 0U; i < sizeof(uarts) / sizeof(uarts[0]); i++)
{
uarts[i]->serial.ops = &mcxc162_uart_ops;
uarts[i]->serial.config = config;
result = rt_hw_serial_register(&uarts[i]->serial, uarts[i]->name,
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
uarts[i]);
if (result != RT_EOK)
{
return result;
}
}
return RT_EOK;
}
INIT_BOARD_EXPORT(rt_hw_uart_init);
#endif /* RT_USING_SERIAL && BSP_USING_UARTx */
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