Solved
OCTOSPI as Single-SPI
Hi everybody,
I'm trying to configure the OCTOSPI1 bus as Single-SPI to read the status register of an external memory (MRAM).
What I expect to see on the scope
What I really see:
- The MCU sends the comand (0x05) on the SI line, generates 8 clock cycles and pulls down the /CS line.
- IO1 is always 1.
Please, find below more details about the setup and code (ask me for more detais if needed):
My system
- MCU: STM32H7B3I
- OCTOSPI1
- Input frequency: 129 MHz
- Prescaler = 4 to meet max frequency constraints of the memory (40 MHz).
- Configured as Single-SPI mode 0.
Memory
- Size: 512 KB
- Max. operating frequency: 40 MHz.
- Mode 0 and mode 3 support.
- Pinout
Physical connections
- OCTOSPI1.SIO0 -> SI
- OCTOSPI1.SIO1 -> SO
- OCTOSPI1.CS -> /CS
- OCTOSPI1.CLK -> SCK
- The /HOLD and /WP pins are at high level, so disabled.
OCTOSPI Init
static void MX_OCTOSPI1_Init(void)
{
OSPIM_CfgTypeDef sOspiManagerCfg = {0};
hospi1.Instance = OCTOSPI1;
hospi1.Init.FifoThreshold = 1;
hospi1.Init.DualQuad = HAL_OSPI_DUALQUAD_DISABLE;
hospi1.Init.MemoryType = HAL_OSPI_MEMTYPE_MICRON;
hospi1.Init.DeviceSize = 19; // 512 KB
hospi1.Init.ChipSelectHighTime = 1;
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 = 4; // 129/(4+1) = 25,8 MHz < 40 MHz
hospi1.Init.SampleShifting = HAL_OSPI_SAMPLE_SHIFTING_NONE;
hospi1.Init.DelayHoldQuarterCycle = HAL_OSPI_DHQC_DISABLE;
hospi1.Init.ChipSelectBoundary = 1;
hospi1.Init.ClkChipSelectHighTime = 0;
hospi1.Init.DelayBlockBypass = HAL_OSPI_DELAY_BLOCK_BYPASSED;
hospi1.Init.MaxTran = 0;
hospi1.Init.Refresh = 0;
if (HAL_OSPI_Init(&hospi1) != HAL_OK)
{
Error_Handler();
}
sOspiManagerCfg.ClkPort = 1;
sOspiManagerCfg.NCSPort = 1;
sOspiManagerCfg.IOLowPort = HAL_OSPIM_IOPORT_1_LOW;
if (HAL_OSPIM_Config(&hospi1, &sOspiManagerCfg, HAL_OSPI_TIMEOUT_DEFAULT_VALUE) != HAL_OK)
{
Error_Handler();
}
}void HAL_OSPI_MspInit(OSPI_HandleTypeDef* hospi)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
if(hospi->Instance==OCTOSPI1)
{
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_OSPI;
PeriphClkInitStruct.PLL2.PLL2M = 32;
PeriphClkInitStruct.PLL2.PLL2N = 129;
PeriphClkInitStruct.PLL2.PLL2P = 2;
PeriphClkInitStruct.PLL2.PLL2Q = 2;
PeriphClkInitStruct.PLL2.PLL2R = 2;
PeriphClkInitStruct.PLL2.PLL2RGE = RCC_PLL2VCIRANGE_1;
PeriphClkInitStruct.PLL2.PLL2VCOSEL = RCC_PLL2VCOWIDE;
PeriphClkInitStruct.PLL2.PLL2FRACN = 0;
PeriphClkInitStruct.OspiClockSelection = RCC_OSPICLKSOURCE_PLL2;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
{
Error_Handler();
}
/* Peripheral clock enable */
__HAL_RCC_OCTOSPIM_CLK_ENABLE();
__HAL_RCC_OSPI1_CLK_ENABLE();
__HAL_RCC_GPIOG_CLK_ENABLE();
__HAL_RCC_GPIOF_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
/**OCTOSPI1 GPIO Configuration
PG6 ------> OCTOSPIM_P1_NCS
PF9 ------> OCTOSPIM_P1_IO1
PB1 ------> OCTOSPIM_P1_IO0
PF10 ------> OCTOSPIM_P1_CLK
*/
GPIO_InitStruct.Pin = GPIO_PIN_6;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF10_OCTOSPIM_P1;
HAL_GPIO_Init(GPIOG, &GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_9;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF10_OCTOSPIM_P1;
HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_1;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF11_OCTOSPIM_P1;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_10;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF9_OCTOSPIM_P1;
HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);
/* OCTOSPI1 interrupt Init */
HAL_NVIC_SetPriority(OCTOSPI1_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(OCTOSPI1_IRQn);
}
}Read Status register (the code is executed without errors but reads a sr = 0xFF).
OSPI_RegularCmdTypeDef cmd = {
.OperationType = HAL_OSPI_OPTYPE_COMMON_CFG,
.FlashId = HAL_OSPI_FLASH_ID_1,
/// Instruction phase
.Instruction = CMD_RDSR,
.InstructionMode = HAL_OSPI_INSTRUCTION_1_LINE, // 1-bit at a time
.InstructionSize = HAL_OSPI_INSTRUCTION_8_BITS,
.InstructionDtrMode = HAL_OSPI_INSTRUCTION_DTR_DISABLE, // Double transfer rate
// Address phase
.AddressMode = HAL_OSPI_ADDRESS_NONE, ///< None => Phase is skipped
// Alternate-bytes phase
.AlternateBytesMode = HAL_OSPI_ALTERNATE_BYTES_NONE, ///< None => Phase is skipped
// Dummy-cycle phase
.DummyCycles = 0, /// 0 => skipped
// Data phase
.DataMode = HAL_OSPI_DATA_1_LINE, // 1 bit at a time
.NbData = 1, // Number of bytes to read/write
.DataDtrMode = HAL_OSPI_DATA_DTR_DISABLE, // Double transfer rate
.DQSMode = HAL_OSPI_DQS_DISABLE, // Data sttrobing not used
.SIOOMode = HAL_OSPI_SIOO_INST_EVERY_CMD
};
if (
HAL_OSPI_Command(
&hospi1,
&cmd,
HAL_OSPI_TIMEOUT_DEFAULT_VALUE
) != HAL_OK
){
Error_Handler();
}
if (
HAL_OSPI_Receive(
&hospi1,
sr,
HAL_OSPI_TIMEOUT_DEFAULT_VALUE
) != HAL_OK
){
Error_Handler();
}Thank you for your time.
Regards,