255 lines
6.3 KiB
C
255 lines
6.3 KiB
C
/************************************************************************************************/
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/**
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* @file ciu32L051_std_usart.c
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* @author MCU Ecosystem Development Team
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* @brief USART STD库驱动。
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* 实现USART初始化、波特率配置、clock配置等功能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 USART
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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_USART_PERIPHERAL_USED
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/*-------------------------------------------functions------------------------------------------*/
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/************************************************************************************************/
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/**
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* @addtogroup USART_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 USART初始化
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* @param usartx USART外设
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* @param usart_init_param USART初始化结构体
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* @retval std_status_t 返回初始化配置结果
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*/
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std_status_t std_usart_init(USART_t *usartx,std_usart_init_t *usart_init_param)
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{
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/* 设置USART字长 */
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std_usart_set_word_length(usartx,usart_init_param->wordlength);
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/* 设置USART停止位 */
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std_usart_set_stopbits(usartx,usart_init_param->stopbits);
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/* 设置USART过采样，如果配置为8倍过采样可以达到最大通信速率 */
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std_usart_set_over_sample(usartx,usart_init_param->over_sample);
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/* 设置USART通信模式(单发送、单接收、发送/接收)*/
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std_usart_set_transfer_direction(usartx,usart_init_param->direction);
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/* 设置奇偶校验 */
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std_usart_set_parity(usartx,usart_init_param->parity);
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/* 设置硬件流控 */
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std_usart_set_hardflow_control(usartx,usart_init_param->hardware_flow);
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/* 设置波特率 */
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if(std_usart_baudrate_config(usartx,usart_init_param->baudrate)!=STD_OK)
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{
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return STD_ERR;
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}
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return STD_OK;
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}
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/**
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* @brief USART去初始化
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* @param usartx USART外设
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* @retval std_status_t 返回去初始化结果
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*/
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void std_usart_deinit(USART_t *usartx)
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{
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std_usart_disable(usartx);
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/* USART 的RCC时钟复位 */
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if(usartx == USART1)
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{
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/* 复位USART1 */
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std_rcc_apb2_reset(RCC_PERIPH_RESET_USART1);
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/* 关闭USART1时钟 */
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std_rcc_apb2_clk_disable(RCC_PERIPH_CLK_USART1);
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}
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else if(usartx == UART2)
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{
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/* 复位UART2 */
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std_rcc_apb1_reset(RCC_PERIPH_RESET_UART2);
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/* 关闭UART2时钟 */
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std_rcc_apb1_clk_disable(RCC_PERIPH_CLK_UART2);
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}
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else if(usartx == UART3)
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{
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/* 复位UART3 */
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std_rcc_apb1_reset(RCC_PERIPH_RESET_UART3);
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/* 关闭UART3时钟 */
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std_rcc_apb1_clk_disable(RCC_PERIPH_CLK_UART3);
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}
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else if(usartx == UART4)
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{
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/* 复位UART4 */
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std_rcc_apb1_reset(RCC_PERIPH_RESET_UART4);
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/* 关闭UART4时钟 */
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std_rcc_apb1_clk_disable(RCC_PERIPH_CLK_UART4);
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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 USART结构体初始化
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* @param usart_init_struct USART结构体
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* @retval 无
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*/
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void std_usart_struct_init(std_usart_init_t *usart_init_struct)
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{
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usart_init_struct->baudrate = 115200;
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usart_init_struct->over_sample = USART_OVERSAMPLE_16;
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usart_init_struct->wordlength = USART_WORDLENGTH_8BITS;
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usart_init_struct->stopbits = USART_STOPBITS_1;
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usart_init_struct->direction = USART_DIRECTION_SEND_RECEIVE;
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usart_init_struct->parity = USART_PARITY_NONE;
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usart_init_struct->hardware_flow = USART_FLOWCONTROL_NONE;
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}
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/**
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* @brief USART同步时钟初始化
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* @param usartx USART外设
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* @param usart_sync_clk_init_param USART同步时钟结构体
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* @retval 无
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*/
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void std_usart_sync_clk_init(USART_t *usartx, std_usart_sync_clk_init_t *usart_sync_clk_init_param)
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{
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/* 配置CK引脚时钟输出 */
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if( USART_CLOCK_ENABLE == usart_sync_clk_init_param->sync_clk)
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{
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std_usart_clk_enable(usartx);
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}
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else
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{
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std_usart_clk_disable(usartx);
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}
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/* 设置同步时钟相位 */
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std_usart_set_sync_clk_phase(usartx,usart_sync_clk_init_param->sync_clock_phase);
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/* 设置同步时钟极性 */
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std_usart_set_sync_clk_polarity(usartx,usart_sync_clk_init_param->sync_clock_polarity);
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}
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/**
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* @brief USART同步时钟结构体初始化
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* @param usart_sync_clk_struct USART同步时钟结构体
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* @retval 无
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*/
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void std_usart_sync_clk_struct_init(std_usart_sync_clk_init_t *usart_sync_clk_struct)
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{
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usart_sync_clk_struct->sync_clk = USART_CLOCK_ENABLE;
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usart_sync_clk_struct->sync_clock_polarity = USART_SYNC_POLARITY_LOW;
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usart_sync_clk_struct->sync_clock_phase = USART_SYNC_PHASE_1EDGE;
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}
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/**
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* @brief 设置USART波特率
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* @param usartx USART外设
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* @param baudrate 波特率
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* @retval std_status_t 返回波特率设置结果
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*/
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std_status_t std_usart_baudrate_config(USART_t *usartx, uint32_t baudrate)
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{
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uint32_t pclk;
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uint32_t over_sample;
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uint32_t brr_value;
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/* 获取USART时钟频率 */
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if(usartx == USART1)
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{
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pclk = std_rcc_get_pclk2freq();
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}
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else if((usartx == UART2) | (usartx == UART3) | (usartx == UART4))
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{
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pclk = std_rcc_get_pclk1freq();
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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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/* 获取过采样配置 */
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over_sample=std_usart_get_over_sample(usartx);
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/* 波特率计算 */
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if(over_sample == USART_OVERSAMPLE_8)
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{
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brr_value = ((((pclk)<<1U) + ((baudrate)>>1U)) / (baudrate));
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}
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else if(over_sample == USART_OVERSAMPLE_16)
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{
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brr_value = (((pclk)+((baudrate)>>1U))/(baudrate));
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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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/* BRR取值范围[0x10,0xFFFF], 必须大于0x10(0d16) */
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if ((brr_value >= USART_BRR_MIN) && (brr_value <= USART_BRR_MAX))
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{
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usartx->BRR = (uint32_t)brr_value;
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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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* @}
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*/
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#endif /* STD_USART_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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