Fail to compile sram_test for WaveShare F746IG

[RndMnkIII]

When try to compile this example:
`/** sram_test.ino sram(sdram) test for this board:
DISCOVERY_F746NG
DISCOVERY_F429ZI
ARMFLY_F407ZG
HASEE_III_F103ZE
ILLUMINATI_F407ZG
REDBULL_V2_F103ZE
WAVESHARE_F746IG
Allocate 256k ram, and write to Serial the results
*/
#include <Sram.h>
#include <LED.h>

void setup() {
Led.Init();
Serial.begin(115200);
}

uint32_t size = SRAM_LENTH / 2; /* define in bsp.h*/;
void loop() {
Serial.print("SRAM SIZE: 0x");
Serial.println(size * 2, HEX);
uint32_t start = millis();

uint32_t sum = 0;
uint32_t sum_check = 0;
uint16_t data;
for (int i = 0; i < size; i++) {
data = i & 0xffff;
sum += i & 0xffff;
BSP_SRAM_WriteData(i * 2, &data, 1) ; //uint16_data, addr*2
}

Serial.print("Write time: ");
Serial.print(millis() - start);
Serial.println(" ms");
start = millis();
Led.on();
for (int i = 0; i < size; i++) {
BSP_SRAM_ReadData(i * 2, &data, 1) ;
sum_check += data;
}
Led.off();

Serial.print("Read time: ");
Serial.print(millis() - start);
Serial.println(" ms");

Serial.print("Checksum should be:");
Serial.println(sum);
Serial.print("Checksum calculated:");
Serial.println(sum_check);

if (sum == sum_check) {
Serial.print("SDRAM is working with buffer size: ");
Serial.println(size);
} else {
Serial.println("SDRAM NOT WORKING !!!");
}

delay(5000);
}, Arduino IDE 1.85 generates this error:In file included from C:\Users\javier\Documents\Arduino\sram_test_WS_CORE746C-I\sram_test_WS_CORE746C-I.ino:11:0:

C:\arduino-1.8.5\hardware\STM32GENERIC\STM32\libraries\SRAM\src/Sram.h:5:17: fatal error: bsp.h: No such file or directory

compilation terminated.

exit status 1
Error compilando para la tarjeta F746x(216M).`