255 lines
6.8 KiB
C
255 lines
6.8 KiB
C
/************************************************************************************************/
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/**
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* @file ciu32L051_std_lpuart.c
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* @author MCU Ecosystem Development Team
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* @brief LPUART STD库驱动。
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* 实现LPUART配置等API。
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*
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**************************************************************************************************
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* @attention
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* Copyright (c) CEC Huada Electronic Design Co.,Ltd. All rights reserved.
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*
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**************************************************************************************************
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*/
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/************************************************************************************************/
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/**
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* @addtogroup CIU32L051_STD_Driver
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* @{
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*/
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/**
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* @addtogroup LPUART
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* @{
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*
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*/
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/************************************************************************************************/
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/*------------------------------------------includes--------------------------------------------*/
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#include "ciu32L051_std.h"
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#ifdef STD_LPUART_PERIPHERAL_USED
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/*-------------------------------------------functions------------------------------------------*/
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/************************************************************************************************/
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/**
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* @addtogroup LPUART_External_Functions
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* @{
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*
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*/
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/************************************************************************************************/
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/**
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* @brief LPUART 初始化
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* @param lpuartx LPUART外设
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* @param lpuart_init_param 初始化结构体
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* @retval std_status_t 返回API执行结果
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*/
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std_status_t std_lpuart_init(LPUART_t *lpuartx, std_lpuart_init_t *lpuart_init_param)
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{
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uint32_t direction = 0U;
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/* 禁用LPUART */
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std_lpuart_disable(lpuartx);
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/* 配置字符长度 */
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std_lpuart_set_word_length(lpuartx,lpuart_init_param->wordlength);
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/* 配置奇偶校验 */
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std_lpuart_set_parity(lpuartx,lpuart_init_param->parity);
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/* 配置停止位 */
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std_lpuart_set_stopbits(lpuartx,lpuart_init_param->stopbits);
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/* 配置预分频 */
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std_lpuart_set_kclk_prescaler(lpuartx,lpuart_init_param->prescaler);
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/* 配置硬件流控 */
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std_lpuart_set_hardflow_control(lpuartx,lpuart_init_param->hardware_flow);
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/* 配置通信波特率 */
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if (STD_OK != (std_lpuart_set_baudrate(lpuartx,lpuart_init_param->baudrate)))
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{
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return STD_ERR;
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}
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/* 配置通信方向 */
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std_lpuart_set_transfer_direction(lpuartx,lpuart_init_param->direction);
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direction = std_lpuart_get_transfer_direction(lpuartx);
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/* 使能LPUART */
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std_lpuart_enable(lpuartx);
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/* 在使能发送器后，需等待TEACK标志置1 */
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if (LPUART_DIRECTION_SEND == (direction & LPUART_DIRECTION_SEND))
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{
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while (!std_lpuart_get_flag(lpuartx, LPUART_FLAG_TEACK))
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{
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}
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}
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/* 在使能接收器后，需等待REACK标志置1 */
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if (LPUART_DIRECTION_RECEIVE == (direction & LPUART_DIRECTION_RECEIVE))
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{
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while (!std_lpuart_get_flag(lpuartx, LPUART_FLAG_REACK))
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{
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}
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}
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return STD_OK;
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}
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/**
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* @brief LPUART 去初始化
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* @param lpuartx LPUART外设
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* @retval 无
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*/
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void std_lpuart_deinit(LPUART_t *lpuartx)
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{
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std_lpuart_disable(lpuartx);
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if(lpuartx == LPUART1)
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{
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/* 复位LPUART1 */
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std_rcc_apb1_reset(RCC_PERIPH_RESET_LPUART1);
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/* 关闭LPUART1时钟 */
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std_rcc_apb1_clk_disable(RCC_PERIPH_CLK_LPUART1);
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}
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else if(lpuartx == LPUART2)
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{
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/* 复位LPUART2 */
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std_rcc_apb1_reset(RCC_PERIPH_RESET_LPUART2);
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/* 关闭LPUART2时钟 */
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std_rcc_apb1_clk_disable(RCC_PERIPH_CLK_LPUART2);
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}
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else
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{
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/* 暂无操作 */
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}
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}
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/**
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* @brief LPUART 波特率计算及BRR寄存器配置
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* @param lpuartx LPUART外设
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* @param baudrate LPUART波特率
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* @retval std_status_t 返回API执行结果
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*/
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std_status_t std_lpuart_set_baudrate(LPUART_t *lpuartx, uint32_t baudrate)
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{
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uint32_t kclk_source = 0;
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uint32_t kclk_frequency = 0;
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uint32_t prescaler_temp = 0;
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uint32_t brr_temp = 0;
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/* 获取LPUART当前的时钟源 */
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if (lpuartx == LPUART1)
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{
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kclk_source = std_rcc_get_lpuart1clk_source();
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/* 获取LPUART当前的时钟源频率 */
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switch (kclk_source)
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{
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case RCC_LPUART1_ASYNC_CLK_SRC_PCLK1:
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{
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kclk_frequency = std_rcc_get_pclk1freq();
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}break;
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case RCC_LPUART1_ASYNC_CLK_SRC_SYSCLK:
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{
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kclk_frequency = std_rcc_get_sysclkfreq();
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}break;
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case RCC_LPUART1_ASYNC_CLK_SRC_RCH:
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{
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kclk_frequency = RCH_VALUE;
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}break;
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case RCC_LPUART1_ASYNC_CLK_SRC_LXTAL:
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{
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kclk_frequency = LXTAL_VALUE;
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}break;
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default:
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{
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kclk_frequency = 0;
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}break;
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}
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}
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else if (lpuartx == LPUART2)
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{
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kclk_source = std_rcc_get_lpuart2clk_source();
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/* 获取LPUART当前的时钟源频率 */
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switch (kclk_source)
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{
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case RCC_LPUART2_ASYNC_CLK_SRC_PCLK1:
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{
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kclk_frequency = std_rcc_get_pclk1freq();
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}break;
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case RCC_LPUART2_ASYNC_CLK_SRC_SYSCLK:
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{
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kclk_frequency = std_rcc_get_sysclkfreq();
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}break;
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case RCC_LPUART2_ASYNC_CLK_SRC_RCH:
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{
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kclk_frequency = RCH_VALUE;
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}break;
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case RCC_LPUART2_ASYNC_CLK_SRC_LXTAL:
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{
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kclk_frequency = LXTAL_VALUE;
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}break;
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default:
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{
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kclk_frequency = 0;
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}break;
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}
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}
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else
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{
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/* 暂无操作 */
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}
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/* 获取LPUART 预分频器的分频值 */
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prescaler_temp = std_lpuart_get_kclk_prescaler(lpuartx);
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/* 计算LPUART BRR配置 */
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brr_temp = (uint32_t)(((((uint64_t)kclk_frequency/(uint64_t)prescaler_temp)<<8) + (baudrate>>1))/(baudrate));
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/* 判断BRR配置在有效范围内 */
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if ((brr_temp>=LPUART_BRR_MIN) &&(brr_temp<=LPUART_BRR_MAX))
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{
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MODIFY_REG(lpuartx->BRR,USART_BRR_LPUART, brr_temp);
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return STD_OK;
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}
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else
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{
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return STD_ERR;
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}
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}
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/**
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* @brief LPUART 结构体初始化
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* @param lpuart_init_struct LPUART初始化结构体指针
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* @retval 无
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*/
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void std_lpuart_struct_init(std_lpuart_init_t *lpuart_init_struct)
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{
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lpuart_init_struct->prescaler = LPUART_PRESCALER_DIV1;
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lpuart_init_struct->baudrate = 9600;
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lpuart_init_struct->wordlength = LPUART_WORDLENGTH_8BITS;
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lpuart_init_struct->hardware_flow = LPUART_FLOWCONTROL_NONE;
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lpuart_init_struct->parity = LPUART_PARITY_NONE;
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lpuart_init_struct->stopbits = LPUART_STOPBITS_1;
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lpuart_init_struct->direction =LPUART_DIRECTION_SEND_RECEIVE;
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}
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/**
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* @}
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*/
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#endif /* STD_LPUART_PERIPHERAL_USED */
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/**
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* @}
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*/
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/**
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* @}
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*/
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