Hello everyone!
I use the Quad SPI flash of stm32 h750. I write data at a certain address through commands, such as address 0. But after configuring the memory mapping mode, I check that the data at address 0x90000000 is 0x88, while my data is at 0x90000001.
more info:
Use Keil MDK software
My operation:
1.Config Quad SPI
2.Write data (0xAB) to address 0
3.Read data in addre 0 (success)
4.Set memory mapped mode
5.Read data in 0x90000000, data is 0x88(error)
I have two questions：
1.After I write data to address, in the memory mapping mode, the data is at address +1（byte）, is this normal?
2.Why can't the operation reach address 0？Seems to be caused by problem 1
Thanks!
My code:
void QUADSPI_Init(void)
{
/* QUADSPI parameter configuration*/
stQSpi.Instance = QUADSPI;
stQSpi.Init.ClockPrescaler = 1;
stQSpi.Init.FifoThreshold = 4;
stQSpi.Init.SampleShifting = QSPI_SAMPLE_SHIFTING_HALFCYCLE;
stQSpi.Init.FlashSize = POSITION_VAL(0X100000)-1;
stQSpi.Init.ChipSelectHighTime = QSPI_CS_HIGH_TIME_5_CYCLE;
stQSpi.Init.ClockMode = QSPI_CLOCK_MODE_0;
stQSpi.Init.FlashID = QSPI_FLASH_ID_1;
stQSpi.Init.DualFlash = QSPI_DUALFLASH_DISABLE;
if (HAL_QSPI_Init(&stQSpi) != HAL_OK)
{
Error_Handler();
}
}
void QSPI_Config_Mmap(void)
{
QSPI_CommandTypeDef Cmdhandler;
QSPI_MemoryMappedTypeDef stMMPCfg;
stMMPCfg.TimeOutActivation = QSPI_TIMEOUT_COUNTER_DISABLE;
stMMPCfg.TimeOutPeriod = 0;
Cmdhandler.Instruction = 0xEB; //Quad IO Fast Read
Cmdhandler.Address = 128;
Cmdhandler.DummyCycles = 4;
Cmdhandler.InstructionMode = QSPI_INSTRUCTION_1_LINE;
Cmdhandler.AddressMode = QSPI_ADDRESS_4_LINES;
Cmdhandler.AddressSize = QSPI_ADDRESS_24_BITS;
Cmdhandler.DataMode = QSPI_DATA_4_LINES;
Cmdhandler.SIOOMode=QSPI_SIOO_INST_EVERY_CMD;
Cmdhandler.AlternateByteMode=QSPI_ALTERNATE_BYTES_NONE;
Cmdhandler.DdrMode=QSPI_DDR_MODE_DISABLE;
Cmdhandler.DdrHoldHalfCycle=QSPI_DDR_HHC_ANALOG_DELAY;
HAL_QSPI_MemoryMapped(&stQSpi,&Cmdhandler,&stMMPCfg);
}
void QspiFlash_Write_Page(uint8_t * pBuffer,uint32_t nWriteAddr, uint16_t nByteNum)
{
stQSPI_CommandSet stCmdSet;
QspiFlash_Write_Enable();
stCmdSet.nCmd=QSPI_FLASH_QuadPageProgram;
stCmdSet.nInstructionMode = QSPI_INSTRUCTION_1_LINE;
stCmdSet.nAddrMode = QSPI_ADDRESS_1_LINE;
stCmdSet.nAddress = nWriteAddr;
stCmdSet.nAddrSize = QSPI_ADDRESS_24_BITS;
stCmdSet.nDataMode = QSPI_DATA_4_LINES;
stCmdSet.nDummyCycles = 0;
QSPI_Send_CMD(stCmdSet);
QSPI_Transmit(pBuffer,nByteNum);
QspiFlash_Wait_Busy();
}
Accepted Solutions
Hi Andex,
This reminds me of the first time I used this mcu with that NOR flash! I suppose you are using the STM32H750-DB.
I think the issue here is the Dummy Cycles in Memory Mapped Function, it should be 6 not 4, with that, you have skipped 1 byt (2 * 4 = 8bits = 1byte)
This is from the Dayasheet!
Hi Andex,
This reminds me of the first time I used this mcu with that NOR flash! I suppose you are using the STM32H750-DB.
I think the issue here is the Dummy Cycles in Memory Mapped Function, it should be 6 not 4, with that, you have skipped 1 byt (2 * 4 = 8bits = 1byte)
This is from the Dayasheet!
Hi Ayoub:
I'm very thank you for helping me solve this problem.
When I set 6-dummy clock, the data is normal!
But I check the sequence diagram is, and maybe it includes 'M0-M7' clock-bit?:
I found a table about the dummy clocks.
