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/******************************************************************************************************************************************
* 文件名称: SWM320_sdram.c
* 功能说明: SWM320单片机的SDRAM驱动程序
* 技术支持: http://www.synwit.com.cn/e/tool/gbook/?bid=1
* 注意事项:
* 版本日期: V1.1.0 2017年10月25日
* 升级记录:
*
*
*******************************************************************************************************************************************
* @attention
*
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS WITH CODING INFORMATION
* REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME. AS A RESULT, SYNWIT SHALL NOT BE HELD LIABLE
* FOR ANY DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE CONTENT
* OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING INFORMATION CONTAINED HEREIN IN CONN-
* -ECTION WITH THEIR PRODUCTS.
*
* COPYRIGHT 2012 Synwit Technology
*******************************************************************************************************************************************/
#include "SWM320.h"
#include "SWM320_sdram.h"
/******************************************************************************************************************************************
* 函数名称: SDRAM_Init()
* 功能说明: SDRAM控制器初始化
* 输 入: SDRAM_InitStructure * initStruct 包含 SDRAM 控制器相关设定值的结构体
* 输 出: 无
* 注意事项: 无
******************************************************************************************************************************************/
void SDRAM_Init(SDRAM_InitStructure * initStruct)
{
uint32_t row_n;
SYS->CLKEN |= (1 << SYS_CLKEN_SDRAM_Pos);
SYS->CLKDIV &= ~SYS_CLKDIV_SDRAM_Msk;
SYS->CLKDIV |= (1 << SYS_CLKDIV_SDRAM_Pos); //2分频
SDRAMC->CR0 = (2 << SDRAMC_CR0_BURSTLEN_Pos) | //2 Burst Length为4
(initStruct->CASLatency << SDRAMC_CR0_CASDELAY_Pos);
SDRAMC->CR1 = (initStruct->CellSize << SDRAMC_CR1_CELLSIZE_Pos) |
(initStruct->CellWidth << SDRAMC_CR1_CELL32BIT_Pos) |
((initStruct->CellSize == SDRAM_CELLSIZE_16Mb ? SDRAM_CELLBANK_2 : SDRAM_CELLBANK_4) << SDRAMC_CR1_BANK_Pos) |
(0 << SDRAMC_CR1_32BIT_Pos) |
(initStruct->TimeTMRD << SDRAMC_CR1_TMRD_Pos) |
(initStruct->TimeTRRD << SDRAMC_CR1_TRRD_Pos) |
(initStruct->TimeTRAS << SDRAMC_CR1_TRAS_Pos) |
(initStruct->TimeTRC << SDRAMC_CR1_TRC_Pos) |
(initStruct->TimeTRCD << SDRAMC_CR1_TRCD_Pos) |
(initStruct->TimeTRP << SDRAMC_CR1_TRP_Pos);
SDRAMC->LATCH = 0x02;
switch(initStruct->CellSize)
{
case SDRAM_CELLSIZE_16Mb: row_n = 11; break;
case SDRAM_CELLSIZE_64Mb: row_n = 12; break;
case SDRAM_CELLSIZE_128Mb: row_n = 12; break;
case SDRAM_CELLSIZE_256Mb: row_n = 13; break;
default: row_n = 13; break;
}
SDRAMC->REFRESH = (1 << SDRAMC_REFRESH_EN_Pos) |
(((SystemCoreClock/2)/1000 * initStruct->RefreshTime / (1 << row_n)) << SDRAMC_REFRESH_RATE_Pos);
while(SDRAMC->REFDONE == 0);
}
/******************************************************************************************************************************************
* 函数名称: SDRAM_Enable()
* 功能说明: SDRAM使能，使能后可读写SDRAM
* 输 入: 无
* 输 出: 无
* 注意事项: 无
******************************************************************************************************************************************/
void SDRAM_Enable(void)
{
uint32_t i;
SYS->CLKEN |= (1 << SYS_CLKEN_SDRAM_Pos);
SDRAMC->REFRESH |= (1 << SDRAMC_REFRESH_EN_Pos);
for(i = 0; i < 100; i++) __NOP();
}
/******************************************************************************************************************************************
* 函数名称: SDRAM_Disable()
* 功能说明: SDRAM禁能，禁能后SDRAM颗粒进入低功耗模式、并自刷新，不可读写
* 输 入: 无
* 输 出: 无
* 注意事项: 无
******************************************************************************************************************************************/
void SDRAM_Disable(void)
{
uint32_t i;
SYS->CLKEN |= (1 << SYS_CLKEN_SDRAM_Pos);
SDRAMC->REFRESH &= ~(1 << SDRAMC_REFRESH_EN_Pos);
for(i = 0; i < 100; i++) __NOP();
}
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