KLST_PANDA + External Memory
KLST_PANDA features a DRAM (PSRAM) S70KL1282 128MBit ( i.e 16MB ) memory connected via HyperRAM™ ( on OCTOSPI1 ).
the OCTOSPI clock is configured to run at 300MHz via PLL2R. the ClockPrescaler value is set to 2 which results in a memory IC frequency of 100MHz ( =300MHz/(ClockPrescaler+1) ).
Clock Configuration
OCTOSPI clock is configured to run at 300MHz via PLL2R. the ClockPrescaler value is set to 2 which results in a frequency of 100MHz ( =300MHz/(ClockPrescaler+1) ).
OCTOSPI configuration
S70KL1282 is connected via OCTOSPI1 as HyperBus™ memory type in memory mapped mode. the address space for 16MB of memory in OCTOSPI1 is 0x90000000–0x90FFFFFF.
GPIO speed is set to Very High. ICache and DCache are enabled.
Generated Configuration Code and User-Added Code for OCTOSPI1 in Memory-Mapped Mode
at 100MHz Clock Speed one cycle has a duration of 10ns ( =1000*1000*1000/100000000Hz )
/**
* @brief OCTOSPI1 Initialization Function
* @param None
* @retval None
*/
static void MX_OCTOSPI1_Init(void) {
/* USER CODE BEGIN OCTOSPI1_Init 0 */
/* USER CODE END OCTOSPI1_Init 0 */
OSPIM_CfgTypeDef sOspiManagerCfg = { 0 };
OSPI_HyperbusCfgTypeDef sHyperBusCfg = { 0 };
/* USER CODE BEGIN OCTOSPI1_Init 1 */
/* USER CODE END OCTOSPI1_Init 1 */
/* OCTOSPI1 parameter configuration*/
hospi1.Instance = OCTOSPI1;
hospi1.Init.FifoThreshold = 4;
hospi1.Init.DualQuad = HAL_OSPI_DUALQUAD_DISABLE;
hospi1.Init.MemoryType = HAL_OSPI_MEMTYPE_HYPERBUS;
hospi1.Init.DeviceSize = 24;
hospi1.Init.ChipSelectHighTime = 2;
hospi1.Init.FreeRunningClock = HAL_OSPI_FREERUNCLK_DISABLE;
hospi1.Init.ClockMode = HAL_OSPI_CLOCK_MODE_0;
hospi1.Init.WrapSize = HAL_OSPI_WRAP_NOT_SUPPORTED;
hospi1.Init.ClockPrescaler = 2;
hospi1.Init.SampleShifting = HAL_OSPI_SAMPLE_SHIFTING_NONE;
hospi1.Init.DelayHoldQuarterCycle = HAL_OSPI_DHQC_ENABLE;
hospi1.Init.ChipSelectBoundary = 0;
hospi1.Init.DelayBlockBypass = HAL_OSPI_DELAY_BLOCK_USED;
hospi1.Init.MaxTran = 23;
hospi1.Init.Refresh = 799;
if (HAL_OSPI_Init(&hospi1) != HAL_OK) {
Error_Handler();
}
sOspiManagerCfg.ClkPort = 1;
sOspiManagerCfg.DQSPort = 1;
sOspiManagerCfg.NCSPort = 1;
sOspiManagerCfg.IOLowPort = HAL_OSPIM_IOPORT_1_LOW;
sOspiManagerCfg.IOHighPort = HAL_OSPIM_IOPORT_1_HIGH;
if (HAL_OSPIM_Config(&hospi1,
&sOspiManagerCfg,
HAL_OSPI_TIMEOUT_DEFAULT_VALUE) != HAL_OK) {
Error_Handler();
}
sHyperBusCfg.RWRecoveryTime = 4;
sHyperBusCfg.AccessTime = 7;
sHyperBusCfg.WriteZeroLatency = HAL_OSPI_LATENCY_ON_WRITE;
sHyperBusCfg.LatencyMode = HAL_OSPI_FIXED_LATENCY;
if (HAL_OSPI_HyperbusCfg(&hospi1,
&sHyperBusCfg,
HAL_OSPI_TIMEOUT_DEFAULT_VALUE) != HAL_OK) {
Error_Handler();
}
/* USER CODE BEGIN OCTOSPI1_Init 2 */
/* USER CODE END OCTOSPI1_Init 2 */
}
Generated Configuration Code for MPU
MPU is configured as follows:
/* MPU Configuration */
void MPU_Config(void) {
MPU_Region_InitTypeDef MPU_InitStruct = { 0 };
/* Disables the MPU */
HAL_MPU_Disable();
/** Initializes and configures the Region and the memory to be protected
*/
MPU_InitStruct.Enable = MPU_REGION_ENABLE;
MPU_InitStruct.Number = MPU_REGION_NUMBER0;
MPU_InitStruct.BaseAddress = KLST_DISPLAY_FRAMEBUFFER_ADDRESS;
MPU_InitStruct.Size = MPU_REGION_SIZE_16MB;
MPU_InitStruct.SubRegionDisable = 0x0;
MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
MPU_InitStruct.IsCacheable = MPU_ACCESS_CACHEABLE;
MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
HAL_MPU_ConfigRegion(&MPU_InitStruct);
/* Enables the MPU */
HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
}
Performance Test
a naive performance test involving reading and writing the entire 16MB in three iterations:
@100MHz
writing 0s : 305ms
writing byte : 396ms
reading byte : 555ms
errors : 0