STM32L4R9AI discovery开发板的PSRAM时序设置

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smallcsduck 发布时间：2018-4-16 22:34

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本帖最后由 smallcsduck 于 2018-4-16 22:35 编辑

前一段时间拿到了ST官方的STM32L4R9AI discovery开发板研究了一下。可能是刚出的板子，资料比较少，STM32cubeMX附带的例程也非常少。很多功能没有做demo，那就来慢慢给他补上吧。要达到的目标不是能跑起来就行了，要能发挥最大的性能和全部的功能。这篇就来讲一下开发板板载的型号为IS66WV1M16EBLL的PSRAM初始化时序设置。
首先是MCU主频是设置在120M。

PSRAM的FMC接口设置。

时序设置。

   下面是寄存器设置，可以直接在SystemInit里初始化PSRAM。
__IO uint32_t tmp = 0x00;

/*-- GPIOs Configuration -----------------------------------------------------*/
/* Enable GPIOD, GPIOE, GPIOF and GPIOG interface clock */
  RCC->AHB2ENR |= 0x000001FF;
  /* Delay after an RCC peripheral clock enabling */
  tmp = READ_BIT(RCC->AHB2ENR, RCC_AHB2ENR_GPIODEN);

  /* Connect PDx pins to FMC Alternate function */
  GPIOD->AFR[0]  = 0xC0CC00CC;
  GPIOD->AFR[1]  = 0xCCCCCCCC;
  /* Configure PDx pins in Alternate function mode */
  GPIOD->MODER = 0xAAAABAFA;
  /* Configure PDx pins speed to 100 MHz */
  GPIOD->OSPEEDR = 0xFFFFCF0F;
  /* Configure PDx pins Output type to push-pull */
  GPIOD->OTYPER  = 0x00000000;
  /* No pull-up, pull-down for PDx pins */
  GPIOD->PUPDR = 0x00000000;

  /* Connect PEx pins to FMC Alternate function */
  GPIOE->AFR[0]  = 0xC000C0CC;
  GPIOE->AFR[1]  = 0xCCCCCCCC;
  /* Configure PEx pins in Alternate function mode */
  GPIOE->MODER = 0xAAAABFBA;
  /* Configure PEx pins speed to 100 MHz */
  GPIOE->OSPEEDR = 0xFFFFC0CF;
  /* Configure PEx pins Output type to push-pull */
  GPIOE->OTYPER  = 0x00000000;
  /* No pull-up, pull-down for PEx pins */
  GPIOE->PUPDR = 0x00000000;

  /* Connect PFx pins to FMC Alternate function */
  GPIOF->AFR[0]  = 0x00CCCCCC;
  GPIOF->AFR[1]  = 0xCCCC0000;
  /* Configure PFx pins in Alternate function mode */
  GPIOF->MODER = 0xAAFFFAAA;
  /* Configure PFx pins speed to 100 MHz */
  GPIOF->OSPEEDR = 0xFF000FFF;
  /* Configure PFx pins Output type to push-pull */
  GPIOF->OTYPER  = 0x00000000;
  /* No pull-up, pull-down for PFx pins */
  GPIOF->PUPDR = 0x00000000;

  /* Connect PGx pins to FMC Alternate function */
  GPIOG->AFR[0]  = 0x00CCCCCC;
  GPIOG->AFR[1]  = 0x00000000;
  /* Configure PGx pins in Alternate function mode */
  GPIOG->MODER = 0xFFFFFAAA;
  /* Configure PGx pins speed to 100 MHz */
  GPIOG->OSPEEDR = 0x00000FFF;
  /* Configure PGx pins Output type to push-pull */
  GPIOG->OTYPER  = 0x00000000;
  /* No pull-up, pull-down for PGx pins */
  GPIOG->PUPDR = 0x00000000;

/*-- FMC/FSMC Configuration --------------------------------------------------*/
  /* Enable the FMC/FSMC interface clock */
  RCC->AHB3ENR       |= 0x00000001;

  /* Delay after an RCC peripheral clock enabling */
  tmp = READ_BIT(RCC->AHB3ENR, RCC_AHB3ENR_FMCEN);
  /* Configure and enable Bank1_SRAM1 */
  FMC_Bank1_R->BTCR[0]  = 0x00005095;
  FMC_Bank1_R->BTCR[1]  = 0x4FF104F3;
  FMC_Bank1E_R->BWTR[1] = 0x0FF103F3;

      项目代码地址在http://github.com/babycheng/STM32L4R9AIDISCOVERY.git。研究好了的代码会及时推送上去。
      项目使用 Arm Compiler 6.9 工具链，调试工具是开发板上集成的STLINK。使用MDK编译以后直接进debug模式运行。程序在SRAM1里面运行。烧进flash运行没有设置。

      本人水平有限，以上如有错误之处，敬请指出。
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