Sorry for confusion. the OP has S25FL256L, not 512. So yes my code should work, after proper initialization of 4-pin mode and enable 32-bit address (this is optional, some prefer 2*16MB layout with 24-bit address). I have not posted the setup code, it is encumbered with unrelated stuff in my project.
** EDIT **
the problem with memory mapped mode can be in number of dummy cycles or alternate bits. Try to add alternate bits:
uint8_t BSP_QSPI_EnableMemoryMappedMode(void)
{
QSPI_CommandTypeDef s_command;
QSPI_MemoryMappedTypeDef s_mem_mapped_cfg;
s_command.InstructionMode = QSPI_INSTRUCTION_1_LINE;
s_command.Instruction = QUAD_INOUT_FAST_READ_CMD;
s_command.AddressMode = QSPI_ADDRESS_4_LINES;
s_command.AddressSize = QSPI_ADDRESS_24_BITS;
s_command.AlternateByteMode = QSPI_ALTERNATE_BYTES_4_LINES; //<<< change
s_command.AlternateBytesSize = QSPI_ALTERNATE_BYTES_8_BITS;
s_command.AlternateBytes = 0; //note see docum about the alt byte value
s_command.DataMode = QSPI_DATA_4_LINES;
s_command.DummyCycles = 8;
s_command.DdrMode = QSPI_DDR_MODE_DISABLE;
s_command.DdrHoldHalfCycle = QSPI_DDR_HHC_ANALOG_DELAY;
s_command.SIOOMode = QSPI_SIOO_INST_EVERY_CMD;
/* Configure the memory mapped mode */
s_mem_mapped_cfg.TimeOutActivation = QSPI_TIMEOUT_COUNTER_DISABLE;
s_mem_mapped_cfg.TimeOutPeriod = 0;
if (HAL_QSPI_MemoryMapped(&QSPIHandle, &s_command, &s_mem_mapped_cfg) != HAL_OK)
{
return QSPI_ERROR;
}
/* Configure QSPI: LPTR register with the low-power time out value */
WRITE_REG(QUADSPI->LPTR, 0xFFF);
return QSPI_OK;
}
The sum of dummy cycles and alternate byte cycles defines where the output data bits begin. The same number will be with no alternate bytes but 10 dummy cycles instead of 8.
