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rt-thread-official/bsp/wch/risc-v/Libraries/ch56x_drivers/ch56x_uart.c

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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-07-15 Emuzit first version
*/
#include <rthw.h>
#include <rtdebug.h>
#include <ipc/completion.h>
#include <ipc/dataqueue.h>
#ifdef RT_USING_SERIAL_V2
#include <drivers/serial_v2.h>
#else
#include <drivers/serial.h>
#endif
#include <drivers/pin.h>
#include "ch56x_sys.h"
#include "ch56x_uart.h"
#include "isr_sp.h"
#if !defined(BSP_USING_UART0) && !defined(BSP_USING_UART1) && \
!defined(BSP_USING_UART2) && !defined(BSP_USING_UART3)
#error "Please define at least one UARTx"
#endif
/* Type of irqn/rxd_pin/txd_pin are per uart driver perspective
* to save some space, still compatible to RT api call, anyway.
*/
struct serial_device
{
struct rt_serial_device parent;
volatile struct uart_registers *reg_base;
uint8_t irqn;
uint8_t resv;
uint8_t rxd_pin;
uint8_t txd_pin;
char *name;
};
#ifdef BSP_USING_UART0
static struct serial_device serial_device_0 =
{
.reg_base = (struct uart_registers *)UART0_REG_BASE,
.irqn = UART0_IRQn,
.rxd_pin = UART_RXD0_PIN,
.txd_pin = UART_TXD0_PIN,
.name = "uart0",
};
#endif
#ifdef BSP_USING_UART1
static struct serial_device serial_device_1 =
{
.reg_base = (struct uart_registers *)UART1_REG_BASE,
.irqn = UART1_IRQn,
.rxd_pin = UART_RXD1_PIN,
.txd_pin = UART_TXD1_PIN,
.name = "uart1",
};
#endif
#ifdef BSP_USING_UART2
static struct serial_device serial_device_2 =
{
.reg_base = (struct uart_registers *)UART2_REG_BASE,
.irqn = UART2_IRQn,
.rxd_pin = UART_RXD2_PIN,
.txd_pin = UART_TXD2_PIN,
.name = "uart2",
};
#endif
#ifdef BSP_USING_UART3
static struct serial_device serial_device_3 =
{
.reg_base = (struct uart_registers *)UART3_REG_BASE,
.irqn = UART3_IRQn,
.rxd_pin = UART_RXD3_PIN,
.txd_pin = UART_TXD3_PIN,
.name = "uart3",
};
#endif
static rt_err_t uart_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
struct serial_device *serial_device = (struct serial_device *)serial;
volatile struct uart_registers *uxreg = serial_device->reg_base;
union _uart_fcr fcr;
union _uart_lcr lcr;
uint32_t x;
x = 10 * sys_hclk_get() / 8 / cfg->baud_rate;
x = (x + 5) / 10;
uxreg->DL = x;
uxreg->DIV = 1;
lcr.reg = 0;
switch (cfg->data_bits)
{
case DATA_BITS_5:
lcr.word_sz = LCR_DATA_BITS_5;
break;
case DATA_BITS_6:
lcr.word_sz = LCR_DATA_BITS_6;
break;
case DATA_BITS_7:
lcr.word_sz = LCR_DATA_BITS_7;
break;
case DATA_BITS_8:
default:
lcr.word_sz = LCR_DATA_BITS_8;
break;
}
switch (cfg->stop_bits)
{
case STOP_BITS_2:
lcr.stop_bit = LCR_STOP_BITS_2;
break;
case STOP_BITS_1:
default:
lcr.stop_bit = LCR_STOP_BITS_1;
break;
}
switch (cfg->parity)
{
case PARITY_ODD:
lcr.par_mod = LCR_PARITY_ODD;
lcr.par_en = 1;
break;
case PARITY_EVEN:
lcr.par_mod = LCR_PARITY_EVEN;
lcr.par_en = 1;
break;
case PARITY_NONE:
default:
lcr.par_en = 0;
break;
}
uxreg->LCR.reg = lcr.reg;
fcr.reg = RB_FCR_FIFO_EN | RB_FCR_RX_FIFO_CLR | RB_FCR_TX_FIFO_CLR;
fcr.fifo_trig = UART_1BYTE_TRIG;
uxreg->FCR.reg = fcr.reg;
/* TXD pin output enable */
uxreg->IER.txd_en = 1;
return RT_EOK;
}
static rt_err_t uart_control(struct rt_serial_device *serial, int cmd, void *args)
{
struct serial_device *serial_device = (struct serial_device *)serial;
volatile struct uart_registers *uxreg = serial_device->reg_base;
switch (cmd)
{
case RT_DEVICE_CTRL_CLR_INT:
uxreg->IER.recv_rdy = 0;
uxreg->IER.line_stat = 0;
uxreg->IER.thr_empty = 0;
rt_hw_interrupt_mask(serial_device->irqn);
break;
case RT_DEVICE_CTRL_SET_INT:
uxreg->FCR.fifo_trig = UART_1BYTE_TRIG;
uxreg->MCR.int_oe = 1;
uxreg->IER.recv_rdy = 1;
uxreg->IER.line_stat = 1;
if (serial->parent.open_flag & RT_DEVICE_FLAG_INT_TX)
{
uxreg->IER.thr_empty = 1;
}
rt_hw_interrupt_umask(serial_device->irqn);
break;
default:
break;
}
return RT_EOK;
}
static int uart_putc(struct rt_serial_device *serial, char ch)
{
struct serial_device *serial_device = (struct serial_device *)serial;
volatile struct uart_registers *uxreg = serial_device->reg_base;
if (serial->parent.open_flag & RT_DEVICE_FLAG_INT_TX)
{
if (uxreg->TFC >= UART_FIFO_SIZE)
return -1;
}
else
{
while (uxreg->TFC >= UART_FIFO_SIZE)
{
if (rt_thread_self() && rt_interrupt_get_nest() == 0)
rt_thread_yield();
}
}
uxreg->THR = ch;
return 1;
}
static int uart_getc(struct rt_serial_device *serial)
{
struct serial_device *serial_device = (struct serial_device *)serial;
volatile struct uart_registers *uxreg = serial_device->reg_base;
/* UART_II_RECV_RDY is cleared by reading RBR */
return (uxreg->RFC > 0) ? uxreg->RBR : -1;
}
static const struct rt_uart_ops uart_ops =
{
.configure = uart_configure,
.control = uart_control,
.putc = uart_putc,
.getc = uart_getc,
.dma_transmit = RT_NULL,
};
int rt_hw_uart_init(void)
{
struct serial_device *devices[4];
/* Note: HCLK should be at least 8MHz for default 115200 baud to work */
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
int n = 0;
#ifdef BSP_USING_UART3
devices[n++] = &serial_device_3;
#endif
#ifdef BSP_USING_UART2
devices[n++] = &serial_device_2;
#endif
#ifdef BSP_USING_UART1
devices[n++] = &serial_device_1;
#endif
#ifdef BSP_USING_UART0
devices[n++] = &serial_device_0;
#endif
while (--n >= 0)
{
uint32_t flag, txd_pin, rxd_pin;
struct serial_device *serial = devices[n];
serial->parent.ops = &uart_ops;
serial->parent.config = config;
txd_pin = serial->txd_pin;
rxd_pin = serial->rxd_pin;
#ifdef BSP_USING_UART0_PIN_ALT
if (serial->irqn == UART0_IRQn)
{
txd_pin = UART_TXD0_ALT;
rxd_pin = UART_RXD0_ALT;
}
#endif
rt_pin_mode(txd_pin, PIN_MODE_OUTPUT);
rt_pin_mode(rxd_pin, PIN_MODE_INPUT_PULLUP);
sys_clk_off_by_irqn(serial->irqn, SYS_SLP_CLK_ON);
flag = RT_DEVICE_FLAG_RDWR |
RT_DEVICE_FLAG_STREAM | // for converting '\n'
RT_DEVICE_FLAG_INT_TX |
RT_DEVICE_FLAG_INT_RX ;
rt_hw_serial_register(&serial->parent, serial->name, flag, RT_NULL);
/* rt_serial_open => uart_control with RT_DEVICE_CTRL_SET_INT */
}
return 0;
}
static void _uart_isr_common(struct serial_device *serial_device)
{
struct rt_serial_device *serial = &serial_device->parent;
volatile struct uart_registers *uxreg = serial_device->reg_base;
switch (uxreg->IIR.int_mask)
{
case UART_II_RECV_TOUT:
/* FIXME: It's a bad idea to read RBR to clear UART_II_RECV_TOUT.
* Race condition may happen that actual rx data is dropped.
*/
if (uxreg->RFC == 0)
{
uxreg->RBR;
//rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_TIMEOUT);
break;
}
/* pass through as if UART_II_RECV_RDY */
case UART_II_RECV_RDY:
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
break;
case UART_II_THR_EMPTY:
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_TX_DONE);
break;
case UART_II_LINE_STAT:
uxreg->LSR;
break;
case UART_II_MODEM_CHG:
uxreg->MSR;
break;
case UART_II_SLV_ADDR:
uxreg->IIR;
break;
default:
break;
}
}
#ifdef BSP_USING_UART0
void uart0_irq_handler(void) __attribute__((interrupt()));
void uart0_irq_handler(void)
{
isr_sp_enter();
rt_interrupt_enter();
_uart_isr_common(&serial_device_0);
rt_interrupt_leave();
isr_sp_leave();
}
#endif
#ifdef BSP_USING_UART1
void uart1_irq_handler(void) __attribute__((interrupt()));
void uart1_irq_handler(void)
{
isr_sp_enter();
rt_interrupt_enter();
_uart_isr_common(&serial_device_1);
rt_interrupt_leave();
isr_sp_leave();
}
#endif
#ifdef BSP_USING_UART2
void uart2_irq_handler(void) __attribute__((interrupt()));
void uart2_irq_handler(void)
{
isr_sp_enter();
rt_interrupt_enter();
_uart_isr_common(&serial_device_2);
rt_interrupt_leave();
isr_sp_leave();
}
#endif
#ifdef BSP_USING_UART3
void uart3_irq_handler(void) __attribute__((interrupt()));
void uart3_irq_handler(void)
{
isr_sp_enter();
rt_interrupt_enter();
_uart_isr_common(&serial_device_3);
rt_interrupt_leave();
isr_sp_leave();
}
#endif
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