AN4570 datasheet(29/46 Pages) STMICROELECTRONICS

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DocID026804 Rev 1

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AN4570

Interfacing with a non-multiplexed, asynchronous 16-bit SRAM

/* GPIOG configuration */

GPIO_Init_Structure.Pin

= GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_2 |

GPIO_PIN_3 | GPIO_PIN_4 | GPIO_PIN_5;

HAL_GPIO_Init(GPIOG, &GPIO_Init_Structure);

/* GPIOD configuration */

GPIO_Init_Structure.Pin

= GPIO_PIN_11 | GPIO_PIN_12 | GPIO_PIN_13;

HAL_GPIO_Init(GPIOD, &GPIO_Init_Structure);

/*## NOE and NWE configuration #######*/

GPIO_Init_Structure.Pin = GPIO_PIN_4 |GPIO_PIN_5;

HAL_GPIO_Init(GPIOD, &GPIO_Init_Structure);

/*## NE3 configuration #######*/

GPIO_Init_Structure.Pin = GPIO_PIN_10;

HAL_GPIO_Init(GPIOG, &GPIO_Init_Structure);

/*## NBL0, NBL1 configuration #######*/

GPIO_Init_Structure.Pin = GPIO_PIN_0 | GPIO_PIN_1;

HAL_GPIO_Init(GPIOE, &GPIO_Init_Structure);

/* Configure common DMA parameters */

dmaHandle.Init.Direction

= DMA_MEMORY_TO_MEMORY;

dmaHandle.Init.PeriphInc

= DMA_PINC_ENABLE;

dmaHandle.Init.MemInc

= DMA_MINC_ENABLE;

dmaHandle.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;

dmaHandle.Init.MemDataAlignment

= DMA_MDATAALIGN_HALFWORD;

dmaHandle.Init.Mode

= DMA_NORMAL;

dmaHandle.Init.Priority

= DMA_PRIORITY_HIGH;

dmaHandle.Instance = SRAM_DMAx_STREAM;

/* Associate the DMA handle */

__HAL_LINKDMA(hsram, hdma, dmaHandle);

/* Deinitialize the Stream for new transfer */

HAL_DMA_DeInit(&dmaHandle);

/* Configure the DMA Stream */

HAL_DMA_Init(&dmaHandle);

/* NVIC configuration for DMA transfer complete interrupt */

HAL_NVIC_SetPriority(SRAM_DMAx_IRQn, 5, 0);

HAL_NVIC_EnableIRQ(SRAM_DMAx_IRQn);

}

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