STM32L4R9I-Discovery BSP User Manual: stm32l4r9i_discovery_psram.c File Reference

This file includes the PSRAM driver for the IS61WV51216BLL-10MLI memory device mounted on STM32L4R9I_DISCOVERY boards.

Author:

MCD Application Team

  How To use this driver:
  -----------------------
   - This driver is used to drive the IS66WVC2M16ECLL-7010BLI external memory mounted
     on STM32L4R9I discovery board.
   - This driver does not need a specific component driver for the PSRAM device
     to be included with.

  Driver description:
  ------------------
  + Initialization steps:
     o Initialize the PSRAM external memory using the BSP_PSRAM_Init() function. This
       function includes the MSP layer hardware resources initialization and the
       FMC controller configuration to interface with the external PSRAM memory.

  + PSRAM read/write operations
     o PSRAM external memory can be accessed with read/write operations once it is
       initialized.
       Read/write operation can be performed with AHB access using the functions
       BSP_PSRAM_ReadData()/BSP_PSRAM_WriteData(), or by DMA transfer using the functions
       BSP_PSRAM_ReadData_DMA()/BSP_PSRAM_WriteData_DMA().
     o The AHB access is performed with 16-bit width transaction, the DMA transfer
       configuration is fixed at single (no burst) halfword transfer.
     o User can implement his own functions for read/write access with his desired
       configurations.
     o If interrupt mode is used for DMA transfer, the function BSP_PSRAM_DMA_IRQHandler()
       is called in IRQ handler file, to serve the generated interrupt once the DMA
       transfer is complete.
  

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Definition in file stm32l4r9i_discovery_psram.c.