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rt-thread-official/bsp/apollo2/board/uart.c

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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2017-09-15 Haley the first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#include "am_mcu_apollo.h"
/* USART0 */
#define AM_UART0_INST 0
#define UART0_GPIO_RX 2
#define UART0_GPIO_CFG_RX AM_HAL_PIN_2_UART0RX
#define UART0_GPIO_TX 1
#define UART0_GPIO_CFG_TX AM_HAL_PIN_1_UART0TX
/* USART1 */
#define AM_UART1_INST 1
#define UART1_GPIO_RX 9
#define UART1_GPIO_CFG_RX AM_HAL_PIN_9_UART1RX
#define UART1_GPIO_TX 8
#define UART1_GPIO_CFG_TX AM_HAL_PIN_8_UART1TX
#define UART_BUFFER_SIZE 256
uint8_t UartRxBuffer[UART_BUFFER_SIZE];
uint8_t UartTxBuffer[UART_BUFFER_SIZE];
/* AM uart driver */
struct am_uart
{
uint32_t uart_device;
uint32_t uart_interrupt;
};
/**
* @brief Enable the UART
*
* @param Uart driver
*
* This function is Enable the UART
*
* @return None.
*/
static void rt_hw_uart_enable(struct am_uart* uart)
{
/* Enable the UART clock */
am_hal_uart_clock_enable(uart->uart_device);
/* Enable the UART */
am_hal_uart_enable(uart->uart_device);
#if defined(RT_USING_UART0)
/* Make sure the UART RX and TX pins are enabled */
am_hal_gpio_pin_config(UART0_GPIO_TX, UART0_GPIO_CFG_TX | AM_HAL_GPIO_PULL24K);
am_hal_gpio_pin_config(UART0_GPIO_RX, UART0_GPIO_CFG_RX | AM_HAL_GPIO_PULL24K);
#endif /* RT_USING_UART0 */
#if defined(RT_USING_UART1)
/* Make sure the UART RX and TX pins are enabled */
am_hal_gpio_pin_config(UART1_GPIO_TX, UART1_GPIO_CFG_TX | AM_HAL_GPIO_PULL24K);
am_hal_gpio_pin_config(UART1_GPIO_RX, UART1_GPIO_CFG_RX | AM_HAL_GPIO_PULL24K);
#endif /* RT_USING_UART1 */
}
/**
* @brief Disable the UART
*
* @param Uart driver
*
* This function is Disable the UART
*
* @return None.
*/
static void rt_hw_uart_disable(struct am_uart* uart)
{
/* Clear all interrupts before sleeping as having a pending UART interrupt burns power */
am_hal_uart_int_clear(uart->uart_device, 0xFFFFFFFF);
/* Disable the UART */
am_hal_uart_disable(uart->uart_device);
#if defined(RT_USING_UART0)
/* Disable the UART pins */
am_hal_gpio_pin_config(UART0_GPIO_TX, AM_HAL_PIN_DISABLE);
am_hal_gpio_pin_config(UART0_GPIO_RX, AM_HAL_PIN_DISABLE);
#endif /* RT_USING_UART0 */
#if defined(RT_USING_UART1)
/* Disable the UART pins */
am_hal_gpio_pin_config(UART1_GPIO_TX, AM_HAL_PIN_DISABLE);
am_hal_gpio_pin_config(UART1_GPIO_RX, AM_HAL_PIN_DISABLE);
#endif /* RT_USING_UART1 */
/* Disable the UART clock */
am_hal_uart_clock_disable(uart->uart_device);
}
/**
* @brief UART-based string print function.
*
* @param Send buff
*
* This function is used for printing a string via the UART, which for some
* MCU devices may be multi-module.
*
* @return None.
*/
void rt_hw_uart_send_string(char *pcString)
{
am_hal_uart_string_transmit_polled(AM_UART0_INST, pcString);
/* Wait until busy bit clears to make sure UART fully transmitted last byte */
while ( am_hal_uart_flags_get(AM_UART0_INST) & AM_HAL_UART_FR_BUSY );
}
//connect am drv to rt drv.
static rt_err_t am_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
struct am_uart* uart;
am_hal_uart_config_t uart_cfg;
RT_ASSERT(serial != RT_NULL);
RT_ASSERT(cfg != RT_NULL);
uart = (struct am_uart *)serial->parent.user_data;
RT_ASSERT(uart != RT_NULL);
/* Get the configure */
uart_cfg.ui32BaudRate = cfg->baud_rate;
if (cfg->data_bits == DATA_BITS_5)
uart_cfg.ui32DataBits = AM_HAL_UART_DATA_BITS_5;
else if (cfg->data_bits == DATA_BITS_6)
uart_cfg.ui32DataBits = AM_HAL_UART_DATA_BITS_6;
else if (cfg->data_bits == DATA_BITS_7)
uart_cfg.ui32DataBits = AM_HAL_UART_DATA_BITS_7;
else if (cfg->data_bits == DATA_BITS_8)
uart_cfg.ui32DataBits = AM_HAL_UART_DATA_BITS_8;
if (cfg->stop_bits == STOP_BITS_1)
uart_cfg.bTwoStopBits = false;
else if (cfg->stop_bits == STOP_BITS_2)
uart_cfg.bTwoStopBits = true;
if (cfg->parity == PARITY_NONE)
uart_cfg.ui32Parity = AM_HAL_UART_PARITY_NONE;
else if (cfg->parity == PARITY_ODD)
uart_cfg.ui32Parity = AM_HAL_UART_PARITY_ODD;
else if (cfg->parity == PARITY_EVEN)
uart_cfg.ui32Parity = AM_HAL_UART_PARITY_EVEN;
uart_cfg.ui32FlowCtrl = AM_HAL_UART_FLOW_CTRL_NONE;
/* UART Config */
am_hal_uart_config(uart->uart_device, &uart_cfg);
/* Enable the UART FIFO */
am_hal_uart_fifo_config(uart->uart_device, AM_HAL_UART_RX_FIFO_7_8 | AM_HAL_UART_RX_FIFO_7_8);
/* Initialize the UART queues */
am_hal_uart_init_buffered(uart->uart_device, UartRxBuffer, UART_BUFFER_SIZE, UartTxBuffer, UART_BUFFER_SIZE);
/* Enable the UART */
am_hal_uart_enable(uart->uart_device);
/* Enable interrupts */
am_hal_uart_int_enable(uart->uart_device, AM_HAL_UART_INT_RX_TMOUT | AM_HAL_UART_INT_RX);
/* Enable the uart interrupt in the NVIC */
am_hal_interrupt_enable(uart->uart_interrupt);
return RT_EOK;
}
static rt_err_t am_control(struct rt_serial_device *serial, int cmd, void *arg)
{
struct am_uart* uart;
//rt_uint32_t ctrl_arg = (rt_uint32_t)(arg);
RT_ASSERT(serial != RT_NULL);
uart = (struct am_uart *)serial->parent.user_data;
RT_ASSERT(uart != RT_NULL);
switch (cmd)
{
/* disable interrupt */
case RT_DEVICE_CTRL_CLR_INT:
rt_hw_uart_disable(uart);
break;
/* enable interrupt */
case RT_DEVICE_CTRL_SET_INT:
rt_hw_uart_enable(uart);
break;
/* UART config */
case RT_DEVICE_CTRL_CONFIG :
break;
}
return RT_EOK;
}
static int am_putc(struct rt_serial_device *serial, char c)
{
uint32_t rxsize, txsize;
struct am_uart* uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct am_uart *)serial->parent.user_data;
RT_ASSERT(uart != RT_NULL);
am_hal_uart_get_status_buffered(uart->uart_device, &rxsize, &txsize);
//if (txsize > 0)
{
am_hal_uart_char_transmit_buffered(uart->uart_device, c);
}
/* Wait until busy bit clears to make sure UART fully transmitted last byte */
while ( am_hal_uart_flags_get(uart->uart_device) & AM_HAL_UART_FR_BUSY );
return 1;
}
static int am_getc(struct rt_serial_device *serial)
{
char c;
int ch;
uint32_t rxsize, txsize;
struct am_uart* uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct am_uart *)serial->parent.user_data;
RT_ASSERT(uart != RT_NULL);
ch = -1;
am_hal_uart_get_status_buffered(uart->uart_device, &rxsize, &txsize);
if (rxsize > 0)
{
am_hal_uart_char_receive_buffered(uart->uart_device, &c, 1);
ch = c & 0xff;
}
return ch;
}
/**
* Uart common interrupt process. This need add to uart ISR.
*
* @param serial serial device
*/
static void uart_isr(struct rt_serial_device *serial)
{
uint32_t status;
struct am_uart* uart;
RT_ASSERT(serial != RT_NULL);
uart = (struct am_uart *) serial->parent.user_data;
RT_ASSERT(uart != RT_NULL);
/* Read the interrupt status */
status = am_hal_uart_int_status_get(uart->uart_device, false);
//rt_kprintf("status is %d\r\n", status);
/* Clear the UART interrupt */
am_hal_uart_int_clear(uart->uart_device, status);
if (status & (AM_HAL_UART_INT_RX_TMOUT | AM_HAL_UART_INT_TX | AM_HAL_UART_INT_RX))
{
am_hal_uart_service_buffered_timeout_save(uart->uart_device, status);
}
if (status & (AM_HAL_UART_INT_RX_TMOUT))
{
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
}
if (status & AM_HAL_UART_INT_RX)
{
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
}
if (status & AM_HAL_UART_INT_TX)
{
rt_hw_serial_isr(serial, RT_SERIAL_EVENT_TX_DONE);
}
}
static const struct rt_uart_ops am_uart_ops =
{
am_configure,
am_control,
am_putc,
am_getc,
};
#if defined(RT_USING_UART0)
/* UART0 device driver structure */
struct am_uart uart0 =
{
AM_UART0_INST,
AM_HAL_INTERRUPT_UART0
};
static struct rt_serial_device serial0;
void am_uart0_isr(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(&serial0);
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* RT_USING_UART0 */
#if defined(RT_USING_UART1)
/* UART1 device driver structure */
struct am_uart uart1 =
{
AM_UART1_INST,
AM_HAL_INTERRUPT_UART1
};
static struct rt_serial_device serial1;
void am_uart1_isr(void)
{
/* enter interrupt */
rt_interrupt_enter();
uart_isr(&serial1);
/* leave interrupt */
rt_interrupt_leave();
}
#endif /* RT_USING_UART1 */
static void GPIO_Configuration(void)
{
#if defined(RT_USING_UART0)
/* Make sure the UART RX and TX pins are enabled */
am_hal_gpio_pin_config(UART0_GPIO_TX, UART0_GPIO_CFG_TX | AM_HAL_GPIO_PULL24K);
am_hal_gpio_pin_config(UART0_GPIO_RX, UART0_GPIO_CFG_RX | AM_HAL_GPIO_PULL24K);
#endif /* RT_USING_UART0 */
#if defined(RT_USING_UART1)
/* Make sure the UART RX and TX pins are enabled */
am_hal_gpio_pin_config(UART1_GPIO_TX, UART1_GPIO_CFG_TX | AM_HAL_GPIO_PULL24K);
am_hal_gpio_pin_config(UART1_GPIO_RX, UART1_GPIO_CFG_RX | AM_HAL_GPIO_PULL24K);
#endif /* RT_USING_UART1 */
}
static void RCC_Configuration(struct am_uart* uart)
{
/* Power on the selected UART */
am_hal_uart_pwrctrl_enable(uart->uart_device);
/* Start the UART interface, apply the desired configuration settings */
am_hal_uart_clock_enable(uart->uart_device);
/* Disable the UART before configuring it */
am_hal_uart_disable(uart->uart_device);
}
/**
* @brief Initialize the UART
*
* This function initialize the UART
*
* @return None.
*/
int rt_hw_uart_init(void)
{
struct am_uart* uart;
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
GPIO_Configuration();
#if defined(RT_USING_UART0)
uart = &uart0;
config.baud_rate = BAUD_RATE_115200;
RCC_Configuration(uart);
serial0.ops = &am_uart_ops;
serial0.config = config;
/* register UART0 device */
rt_hw_serial_register(&serial0, "uart0",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX |
RT_DEVICE_FLAG_INT_TX, uart);
#endif /* RT_USING_UART0 */
#if defined(RT_USING_UART1)
uart = &uart1;
config.baud_rate = BAUD_RATE_115200;
RCC_Configuration(uart);
serial1.ops = &am_uart_ops;
serial1.config = config;
/* register UART1 device */
rt_hw_serial_register(&serial1, "uart1",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX |
RT_DEVICE_FLAG_INT_TX, uart);
#endif /* RT_USING_UART1 */
return 0;
}
/*@}*/
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