57 lines
2.3 KiB
C
57 lines
2.3 KiB
C
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/******************************************************************************************************************************************
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* 文件名称: SWM320_sram.c
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* 功能说明: SWM320单片机的SRAM驱动程序
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* 技术支持: http://www.synwit.com.cn/e/tool/gbook/?bid=1
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* 注意事项:
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* 版本日期: V1.1.0 2017年10月25日
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* 升级记录:
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*
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*
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*******************************************************************************************************************************************
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* @attention
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*
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* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS WITH CODING INFORMATION
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* REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. AS A RESULT, SYNWIT SHALL NOT BE HELD LIABLE
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* FOR ANY DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE CONTENT
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* OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING INFORMATION CONTAINED HEREIN IN CONN-
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* -ECTION WITH THEIR PRODUCTS.
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*
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* COPYRIGHT 2012 Synwit Technology
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*******************************************************************************************************************************************/
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#include "SWM320.h"
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#include "SWM320_sram.h"
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/******************************************************************************************************************************************
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* 函数名称: SRAM_Init()
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* 功能说明: SRAM控制器初始化
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* 输 入: SRAM_InitStructure * initStruct 包含 SRAM 控制器相关设定值的结构体
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* 输 出: 无
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* 注意事项: 无
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******************************************************************************************************************************************/
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void SRAM_Init(SRAM_InitStructure *initStruct)
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{
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uint32_t i;
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// 配置SRAM前需要刷新下SDRAM控制器
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do
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{
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SYS->CLKEN |= (1 << SYS_CLKEN_SDRAM_Pos);
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while (SDRAMC->REFDONE == 0)
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;
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SDRAMC->REFRESH &= ~(1 << SDRAMC_REFRESH_EN_Pos);
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for (i = 0; i < 1000; i++)
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__NOP();
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SYS->CLKEN &= ~(1 << SYS_CLKEN_SDRAM_Pos);
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} while (0);
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SYS->CLKEN |= (1 << SYS_CLKEN_RAMC_Pos);
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for (i = 0; i < 10; i++)
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__NOP();
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SRAMC->CR = (initStruct->ClkDiv << SRAMC_CR_RWTIME_Pos) |
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(initStruct->DataWidth << SRAMC_CR_BYTEIF_Pos) |
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(0 << SRAMC_CR_HBLBDIS_Pos); // 使能字节、半字访问
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}
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