1 /*
2 * Copyright (c) 2006-2022, Synwit Technology Co.,Ltd.
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 *
6 * Change Logs:
7 * Date Author Notes
8 * 2018-05-31 ZYH first version
9 * 2018-12-10 Zohar_Lee format file
10 * 2020-07-10 lik rewrite
11 */
12
13 #include "drv_sram.h"
14
15 #ifdef BSP_USING_EXT_SRAM
16
17 #define DRV_DEBUG
18 #define LOG_TAG "drv.ext_sram"
19 #include <drv_log.h>
20
21 #ifdef RT_USING_MEMHEAP_AS_HEAP
22 static struct rt_memheap system_heap;
23 #endif
24
rt_hw_sram_init(void)25 static int rt_hw_sram_init(void)
26 {
27 SRAM_InitStructure SRAM_InitStruct;
28
29 PORT->PORTP_SEL0 = 0xAAAAAAAA; //PP0-23 => ADDR0-23
30 PORT->PORTP_SEL1 = 0xAAAA;
31
32 PORT->PORTM_SEL0 = 0xAAAAAAAA; //PM0-15 => DATA15-0
33 PORT->PORTM_INEN = 0xFFFF;
34
35 PORT->PORTM_SEL1 = 0xAAA; //PM16 => OEN,PM17 => WEN,PM18 => NORFL_CSN,PM19 => SDRAM_CSN,PM20 => SRAM_CSN,PM21 => SDRAM_CKE
36
37 SRAM_InitStruct.ClkDiv = SRAM_CLKDIV_8;
38 SRAM_InitStruct.DataWidth = SRAM_DATAWIDTH_16;
39 SRAM_Init(&SRAM_InitStruct);
40
41 #ifdef RT_USING_MEMHEAP_AS_HEAP
42 /* If RT_USING_MEMHEAP_AS_HEAP is enabled, SRAM is initialized to the heap */
43 rt_memheap_init(&system_heap, "sram", (void *)EXT_SRAM_BEGIN, EXT_SRAM_SIZE);
44 #endif
45
46 return 0;
47 }
48 INIT_BOARD_EXPORT(rt_hw_sram_init);
49
50 #endif /* BSP_USING_EXT_SRAM */
51