# How to setting PSRAM in AMB23?
**URL:** https://forum.amebaiot.com/t/how-to-setting-psram-in-amb23/2333
**Category:** SDK
**Created:** [October 21, 2023, 3:28pm UTC](https://forum.amebaiot.com/t/how-to-setting-psram-in-amb23/2333 "2023-10-21T15:28:29Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Allen54a0](https://forum.amebaiot.com/u/Allen54a0)
#### Post date: [October 21, 2023, 3:28pm UTC](https://forum.amebaiot.com/t/how-to-setting-psram-in-amb23/2333/1 "2023-10-21T15:28:29Z")
There are 4 Mb PSRAM in AMB23. Due to the big size of Wifi / FreeRTOS and LVGL v8 in our project. How can we configure the GCC config. files so that we can utilitize PSRAM as the interal ram like SRAM did ?
What we want to do is very similar to the following example，Thanks.
> **[Heap Memory Allocation - ESP32 - — ESP-IDF Programming Guide v5.5.1...](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/system/mem_alloc.html?highlight=spiram)**
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### Author:  [@dakamaster](https://forum.amebaiot.com/u/dakamaster)
#### Post date: [October 22, 2023, 2:03am UTC](https://forum.amebaiot.com/t/how-to-setting-psram-in-amb23/2333/2 "2023-10-22T02:03:35Z")
From standard sdk, there is [ambd\_sdk](https://github.com/ambiot/ambd_sdk/tree/dev)/component/os/os\_dep/psram\_reserve.c for configuring PSRAM.
Upon searching for the keyword `configUSE_PSRAM_FOR_HEAP_REGION` as indicated below:
>
We could find FreeRTOSConfig.h for configuring the size of PSRAM:
>
Hope it could help. Thanks
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### Author:  [@Allen54a0](https://forum.amebaiot.com/u/Allen54a0)
#### Post date: [October 23, 2023, 6:02am UTC](https://forum.amebaiot.com/t/how-to-setting-psram-in-amb23/2333/3 "2023-10-23T06:02:10Z")
Thanks for your information, I’ll try to adapt it into my project.
---
### Author:  [@Allen54a0](https://forum.amebaiot.com/u/Allen54a0)
#### Post date: [November 3, 2023, 3:55am UTC](https://forum.amebaiot.com/t/how-to-setting-psram-in-amb23/2333/4 "2023-11-03T03:55:55Z")
目前是用這招解決，可以在Arduino 的開發環境中使用PSRAM。
I am using this code to initial PSRAM in Arduino Environment. It works but not know if it is a right way to do.
```auto
void setup()
{
/// ------------------------- Enable PSRAM ---------------------------------------------------------
app_init_psram();
//user code
}
void app_init_psram(void)
{
u32 temp;
PCTL_InitTypeDef PCTL_InitStruct;
/*set rwds pull down*/
temp = HAL_READ32(PINMUX_REG_BASE, 0x104);
temp &= ~(PAD_BIT_PULL_UP_RESISTOR_EN | PAD_BIT_PULL_DOWN_RESISTOR_EN);
temp |= PAD_BIT_PULL_DOWN_RESISTOR_EN;
HAL_WRITE32(PINMUX_REG_BASE, 0x104, temp);
PSRAM_CTRL_StructInit(&PCTL_InitStruct);
PSRAM_CTRL_Init(&PCTL_InitStruct);
PSRAM_PHY_REG_Write(REG_PSRAM_CAL_PARA, 0x02030310);
/*check psram valid*/
HAL_WRITE32(PSRAM_BASE, 0, 0);
assert_param(0 == HAL_READ32(PSRAM_BASE, 0));
if (SYSCFG_CUT_VERSION_A != SYSCFG_CUTVersion())
{
if (_FALSE == PSRAM_calibration())
return;
if (FALSE == psram_dev_config.psram_dev_cal_enable)
{
temp = PSRAM_PHY_REG_Read(REG_PSRAM_CAL_CTRL);
temp &= (~BIT_PSRAM_CFG_CAL_EN);
PSRAM_PHY_REG_Write(REG_PSRAM_CAL_CTRL, temp);
}
}
/*init psram bss area*/
memset( __psram_bss_start__ , 0, __psram_bss_end__ - __psram_bss_start__ );
}
```