423 lines
10 KiB
C
423 lines
10 KiB
C
/*
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* File : uart.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2017-09-15 Haley the first version
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*/
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#include <rtdevice.h>
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#include "am_mcu_apollo.h"
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#include "board.h"
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/* USART0 */
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#define AM_UART0_INST 0
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#define UART0_GPIO_RX 2
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#define UART0_GPIO_CFG_RX AM_HAL_PIN_2_UART0RX
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#define UART0_GPIO_TX 1
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#define UART0_GPIO_CFG_TX AM_HAL_PIN_1_UART0TX
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/* USART1 */
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#define AM_UART1_INST 1
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#define UART1_GPIO_RX 9
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#define UART1_GPIO_CFG_RX AM_HAL_PIN_9_UART1RX
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#define UART1_GPIO_TX 8
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#define UART1_GPIO_CFG_TX AM_HAL_PIN_8_UART1TX
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/* AM uart driver */
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struct am_uart
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{
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uint32_t uart_device;
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uint32_t uart_interrupt;
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};
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/**
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* @brief UART configuration settings
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*
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*/
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am_hal_uart_config_t g_sUartConfig =
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{
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115200, // ui32BaudRate
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AM_HAL_UART_DATA_BITS_8, // ui32DataBits
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false, // bTwoStopBits
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AM_HAL_UART_PARITY_NONE, // ui32Parity
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AM_HAL_UART_FLOW_CTRL_NONE, // ui32FlowCtrl
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};
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/**
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* @brief Enable the UART
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*
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* @param Uart driver
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*
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* This function is Enable the UART
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*
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* @return None.
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*/
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static void rt_hw_uart_enable(struct am_uart* uart)
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{
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/* Enable the UART clock */
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am_hal_uart_clock_enable(uart->uart_device);
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/* Enable the UART */
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am_hal_uart_enable(uart->uart_device);
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#if defined(RT_USING_UART0)
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/* Make sure the UART RX and TX pins are enabled */
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am_hal_gpio_pin_config(UART0_GPIO_TX, UART0_GPIO_CFG_TX);
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am_hal_gpio_pin_config(UART0_GPIO_RX, UART0_GPIO_CFG_RX | AM_HAL_GPIO_PULL12K);
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#endif /* RT_USING_UART0 */
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#if defined(RT_USING_UART1)
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/* Make sure the UART RX and TX pins are enabled */
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am_hal_gpio_pin_config(UART1_GPIO_TX, UART1_GPIO_CFG_TX);
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am_hal_gpio_pin_config(UART1_GPIO_RX, UART1_GPIO_CFG_RX | AM_HAL_GPIO_PULL12K);
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#endif /* RT_USING_UART1 */
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}
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/**
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* @brief Disable the UART
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*
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* @param Uart driver
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*
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* This function is Disable the UART
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*
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* @return None.
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*/
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static void rt_hw_uart_disable(struct am_uart* uart)
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{
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/* Clear all interrupts before sleeping as having a pending UART interrupt burns power */
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am_hal_uart_int_clear(uart->uart_device, 0xFFFFFFFF);
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/* Disable the UART */
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am_hal_uart_disable(uart->uart_device);
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#if defined(RT_USING_UART0)
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/* Disable the UART pins */
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am_hal_gpio_pin_config(UART0_GPIO_TX, AM_HAL_PIN_DISABLE);
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am_hal_gpio_pin_config(UART0_GPIO_RX, AM_HAL_PIN_DISABLE);
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#endif /* RT_USING_UART0 */
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#if defined(RT_USING_UART1)
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/* Disable the UART pins */
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am_hal_gpio_pin_config(UART1_GPIO_TX, AM_HAL_PIN_DISABLE);
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am_hal_gpio_pin_config(UART1_GPIO_RX, AM_HAL_PIN_DISABLE);
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#endif /* RT_USING_UART1 */
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/* Disable the UART clock */
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am_hal_uart_clock_disable(uart->uart_device);
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}
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/**
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* @brief UART-based string print function.
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*
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* @param Send buff
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*
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* This function is used for printing a string via the UART, which for some
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* MCU devices may be multi-module.
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*
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* @return None.
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*/
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void rt_hw_uart_send_string(char *pcString)
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{
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am_hal_uart_string_transmit_polled(AM_UART0_INST, pcString);
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/* Wait until busy bit clears to make sure UART fully transmitted last byte */
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while ( am_hal_uart_flags_get(AM_UART0_INST) & AM_HAL_UART_FR_BUSY );
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}
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static rt_err_t am_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
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{
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struct am_uart* uart;
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RT_ASSERT(serial != RT_NULL);
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RT_ASSERT(cfg != RT_NULL);
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uart = (struct am_uart *)serial->parent.user_data;
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RT_ASSERT(uart != RT_NULL);
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/* Get the configure */
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g_sUartConfig.ui32BaudRate = cfg->baud_rate;
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g_sUartConfig.ui32DataBits = cfg->data_bits;
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if (cfg->stop_bits == STOP_BITS_1)
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g_sUartConfig.bTwoStopBits = false;
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else if (cfg->stop_bits == STOP_BITS_2)
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g_sUartConfig.bTwoStopBits = true;
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g_sUartConfig.ui32Parity = cfg->parity;
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g_sUartConfig.ui32FlowCtrl = AM_HAL_UART_PARITY_NONE;
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/* Configure the UART */
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am_hal_uart_config(uart->uart_device, &g_sUartConfig);
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/* Enable the UART */
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am_hal_uart_enable(uart->uart_device);
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return RT_EOK;
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}
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static rt_err_t am_control(struct rt_serial_device *serial, int cmd, void *arg)
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{
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struct am_uart* uart;
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//rt_uint32_t ctrl_arg = (rt_uint32_t)(arg);
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RT_ASSERT(serial != RT_NULL);
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uart = (struct am_uart *)serial->parent.user_data;
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RT_ASSERT(uart != RT_NULL);
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switch (cmd)
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{
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/* disable interrupt */
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case RT_DEVICE_CTRL_CLR_INT:
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rt_hw_uart_disable(uart);
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break;
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/* enable interrupt */
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case RT_DEVICE_CTRL_SET_INT:
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rt_hw_uart_enable(uart);
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break;
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/* UART config */
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case RT_DEVICE_CTRL_CONFIG :
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break;
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}
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return RT_EOK;
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}
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static int am_putc(struct rt_serial_device *serial, char c)
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{
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struct am_uart* uart;
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RT_ASSERT(serial != RT_NULL);
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uart = (struct am_uart *)serial->parent.user_data;
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RT_ASSERT(uart != RT_NULL);
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am_hal_uart_char_transmit_polled(uart->uart_device, c);
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return 1;
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}
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static int am_getc(struct rt_serial_device *serial)
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{
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char c;
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int ch;
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struct am_uart* uart;
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RT_ASSERT(serial != RT_NULL);
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uart = (struct am_uart *)serial->parent.user_data;
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RT_ASSERT(uart != RT_NULL);
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ch = -1;
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if ((am_hal_uart_flags_get(uart->uart_device) & AM_HAL_UART_FR_RX_EMPTY) == 0)
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{
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am_hal_uart_char_receive_polled(uart->uart_device, &c);
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ch = c & 0xff;
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}
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return ch;
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}
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/**
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* Uart common interrupt process. This need add to uart ISR.
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*
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* @param serial serial device
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*/
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static void uart_isr(struct rt_serial_device *serial)
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{
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uint32_t status;
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struct am_uart* uart;
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RT_ASSERT(serial != RT_NULL);
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uart = (struct am_uart *) serial->parent.user_data;
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RT_ASSERT(uart != RT_NULL);
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/* Read the interrupt status */
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status = am_hal_uart_int_status_get(uart->uart_device, false);
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//rt_kprintf("status is %d\r\n", status);
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/* Clear the UART interrupt */
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am_hal_uart_int_clear(uart->uart_device, status);
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if (status & (AM_HAL_UART_INT_RX_TMOUT))
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{
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rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
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}
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if (status & AM_HAL_UART_INT_RX)
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{
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rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND);
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}
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if (status & AM_HAL_UART_INT_TX)
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{
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// rt_hw_serial_isr(serial, RT_SERIAL_EVENT_TX_DONE);
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}
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}
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static const struct rt_uart_ops am_uart_ops =
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{
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am_configure,
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am_control,
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am_putc,
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am_getc,
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};
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#if defined(RT_USING_UART0)
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/* UART0 device driver structure */
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struct am_uart uart0 =
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{
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AM_UART0_INST,
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AM_HAL_INTERRUPT_UART0
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};
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static struct rt_serial_device serial0;
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void am_uart0_isr(void)
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{
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/* enter interrupt */
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rt_interrupt_enter();
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uart_isr(&serial0);
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/* leave interrupt */
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rt_interrupt_leave();
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}
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#endif /* RT_USING_UART0 */
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#if defined(RT_USING_UART1)
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/* UART1 device driver structure */
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struct am_uart uart1 =
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{
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AM_UART1_INST,
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AM_HAL_INTERRUPT_UART1
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};
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static struct rt_serial_device serial1;
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void am_uart1_isr(void)
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{
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/* enter interrupt */
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rt_interrupt_enter();
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uart_isr(&serial1);
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/* leave interrupt */
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rt_interrupt_leave();
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}
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#endif /* RT_USING_UART1 */
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static void GPIO_Configuration(void)
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{
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#if defined(RT_USING_UART0)
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/* Make sure the UART RX and TX pins are enabled */
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am_hal_gpio_pin_config(UART0_GPIO_TX, UART0_GPIO_CFG_TX);
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am_hal_gpio_pin_config(UART0_GPIO_RX, UART0_GPIO_CFG_RX | AM_HAL_GPIO_PULL12K);
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#endif /* RT_USING_UART0 */
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#if defined(RT_USING_UART1)
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/* Make sure the UART RX and TX pins are enabled */
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am_hal_gpio_pin_config(UART1_GPIO_TX, UART1_GPIO_CFG_TX);
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am_hal_gpio_pin_config(UART1_GPIO_RX, UART1_GPIO_CFG_RX | AM_HAL_GPIO_PULL12K);
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#endif /* RT_USING_UART1 */
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}
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static void RCC_Configuration(struct am_uart* uart)
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{
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/* Power on the selected UART */
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am_hal_uart_pwrctrl_enable(uart->uart_device);
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/* Start the UART interface, apply the desired configuration settings */
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am_hal_uart_clock_enable(uart->uart_device);
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/* Disable the UART before configuring it */
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am_hal_uart_disable(uart->uart_device);
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/* Configure the UART */
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am_hal_uart_config(uart->uart_device, &g_sUartConfig);
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/* Enable the UART */
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am_hal_uart_enable(uart->uart_device);
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/* Enable the UART FIFO */
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am_hal_uart_fifo_config(uart->uart_device, AM_HAL_UART_TX_FIFO_1_2 | AM_HAL_UART_RX_FIFO_1_2);
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}
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static void NVIC_Configuration(struct am_uart* uart)
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{
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/* Enable interrupts */
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am_hal_uart_int_enable(uart->uart_device, AM_HAL_UART_INT_RX_TMOUT | AM_HAL_UART_INT_RX);
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/* Enable the uart interrupt in the NVIC */
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am_hal_interrupt_enable(uart->uart_interrupt);
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}
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/**
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* @brief Initialize the UART
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*
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* This function initialize the UART
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*
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* @return None.
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*/
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void rt_hw_uart_init(void)
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{
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struct am_uart* uart;
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struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
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GPIO_Configuration();
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#if defined(RT_USING_UART0)
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uart = &uart0;
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config.baud_rate = BAUD_RATE_115200;
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RCC_Configuration(uart);
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NVIC_Configuration(uart);
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serial0.ops = &am_uart_ops;
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serial0.config = config;
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/* register UART1 device */
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rt_hw_serial_register(&serial0, "uart0",
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RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX |
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RT_DEVICE_FLAG_INT_TX, uart);
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#endif /* RT_USING_UART0 */
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#if defined(RT_USING_UART1)
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uart = &uart1;
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config.baud_rate = BAUD_RATE_115200;
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RCC_Configuration(uart);
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NVIC_Configuration(uart);
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serial1.ops = &am_uart_ops;
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serial1.config = config;
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/* register UART1 device */
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rt_hw_serial_register(&serial1, "uart1",
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RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX |
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RT_DEVICE_FLAG_INT_TX, uart);
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#endif /* RT_USING_UART1 */
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}
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/*@}*/
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