104 lines
4.4 KiB
C
104 lines
4.4 KiB
C
/******************************************************************************************************************************************
|
||
* 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->CellBank << 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*64 / (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();
|
||
}
|