Trouble getting APS6404L PSRAM to respond on STM32H7S3L8H6H
Hello dear community,
I’m a beginner with STM32 and I’m trying to interface an APS6404L PSRAM to my STM32H7S3L8H6H using the XSPI1 peripheral. Despite configuring XSPI in CubeMX and generating the initialization code, I see no activity on any of the XSPI1 pins (CS, CLK, D0, D1, etc.) when I attempt a simple “Read ID” command. However, if I reconfigure those same pins as GPIO outputs and toggle them manually, they toggle just fine, so I know the pins themselves are physically working.
I suspect that something is missing or mis‐configured in the MX_XSPI1_Init() code, but I’m not sure what to look for next. Below is my XSPI1 initialization and the test routine I’m using:
XSPI1 Initialization (generated by CubeMX)
static void MX_XSPI1_Init(void)
{
XSPIM_CfgTypeDef sXspiManagerCfg = {0};
hxspi1.Instance = XSPI1;
hxspi1.Init.FifoThresholdByte = 1;
hxspi1.Init.MemoryMode = HAL_XSPI_SINGLE_MEM;
hxspi1.Init.MemoryType = HAL_XSPI_MEMTYPE_APMEM;
hxspi1.Init.MemorySize = HAL_XSPI_SIZE_64MB;
hxspi1.Init.ChipSelectHighTimeCycle = 1;
hxspi1.Init.FreeRunningClock = HAL_XSPI_FREERUNCLK_DISABLE;
hxspi1.Init.ClockMode = HAL_XSPI_CLOCK_MODE_0;
hxspi1.Init.WrapSize = HAL_XSPI_WRAP_NOT_SUPPORTED;
hxspi1.Init.ClockPrescaler = 3;
hxspi1.Init.SampleShifting = HAL_XSPI_SAMPLE_SHIFT_NONE;
hxspi1.Init.DelayHoldQuarterCycle = HAL_XSPI_DHQC_DISABLE;
hxspi1.Init.ChipSelectBoundary = HAL_XSPI_BONDARYOF_NONE;
hxspi1.Init.MaxTran = 0;
hxspi1.Init.Refresh = 0;
hxspi1.Init.MemorySelect = HAL_XSPI_CSSEL_NCS1;
if (HAL_XSPI_Init(&hxspi1) != HAL_OK)
{
Error_Handler();
}
sXspiManagerCfg.nCSOverride = HAL_XSPI_CSSEL_OVR_NCS1;
sXspiManagerCfg.IOPort = HAL_XSPIM_IOPORT_1;
if (HAL_XSPIM_Config(&hxspi1, &sXspiManagerCfg, HAL_XSPI_TIMEOUT_DEFAULT_VALUE) != HAL_OK)
{
Error_Handler();
}
}
Test Routines
HAL_StatusTypeDef PSRAM_Reset(void) {
XSPI_RegularCmdTypeDef sCommand;
HAL_StatusTypeDef status;
memset(&sCommand, 0, sizeof(sCommand));
sCommand.OperationType = HAL_XSPI_OPTYPE_COMMON_CFG;
sCommand.InstructionMode = HAL_XSPI_INSTRUCTION_1_LINE;
sCommand.Instruction = 0x66;
sCommand.AddressMode = HAL_XSPI_ADDRESS_NONE;
sCommand.DataMode = HAL_XSPI_DATA_NONE;
sCommand.DummyCycles = 0;
status = HAL_XSPI_Command(&hxspi1, &sCommand, HAL_TIMEOUT);
if (status != HAL_OK) {
return status;
}
sCommand.Instruction = 0x99;
status = HAL_XSPI_Command(&hxspi1, &sCommand, HAL_TIMEOUT);
return status;
}
HAL_StatusTypeDef PSRAM_ReadID(uint8_t *pID) {
XSPI_RegularCmdTypeDef sCommand;
HAL_StatusTypeDef status;
memset(&sCommand, 0, sizeof(sCommand));
sCommand.OperationType = HAL_XSPI_OPTYPE_COMMON_CFG;
sCommand.InstructionMode = HAL_XSPI_INSTRUCTION_1_LINE;
sCommand.Instruction = 0x9F;
sCommand.AddressMode = HAL_XSPI_ADDRESS_NONE;
sCommand.AlternateBytesMode = HAL_XSPI_ALT_BYTES_NONE;
sCommand.DataMode = HAL_XSPI_DATA_1_LINE;
sCommand.DataLength = 3;
sCommand.DummyCycles = 0;
status = HAL_XSPI_Command(&hxspi1, &sCommand, HAL_TIMEOUT);
if (status != HAL_OK) {
return status;
}
return HAL_XSPI_Receive(&hxspi1, pID, HAL_TIMEOUT);
}
// In main():
HAL_Delay(1);
PSRAM_Reset();
HAL_Delay(1);
uint8_t id[3];
char msg[50];
if (PSRAM_ReadID(id) == HAL_OK) {
snprintf(msg, sizeof(msg), "ID: %02X %02X %02X\r\n", id[0], id[1],
id[2]);
HAL_UART_Transmit(&huart4, (uint8_t*) msg, strlen(msg), HAL_MAX_DELAY);
} else {
HAL_UART_Transmit(&huart4, (uint8_t*) "Read ID failed\r\n", 16,
HAL_MAX_DELAY);
}
Thank you very much in advance for any suggestions or advice.
I'm still learning, so please excuse any naive mistakes. I'd greatly appreciate any guidance on which registry bits to check or what CubeMX settings might be wrong.