STM32 SPI problem (MOSI doesn´t work) for SPI 3 and 4

Forum|Forum|6 years ago
February 29, 2020
4 replies
1825 views

Greetings,

I am dealing with a STM32H743ZI MCU and many of its embedded peripherals, the board is a NUCLEO H743ZI2

I encounter a strange behaviour regarding SPI configuration, for SPI 1 the MOSI pinout works as expected, but for SPI 3 and SPI 4 the MOSI doesn´t work; there are no output from MOSI pin.

I am using the GPIO alternate function configuration from the STM32H742xI/G STM32H743xI/G document (its a 357 pages one), there are several tables that list the corresponding AF for each pin and desired functionality.

The initialization code (for SPI4) I am using is this one (the same for SPI 1 works well, obviously with corresponding GPIO and AF for SPI 1):

/* SPI handler 4 declaration */
SPI_HandleTypeDef SpiHandle4 __attribute__((section(".ramd2")));
 
void SPI4_Init(void)
{
 GPIO_InitTypeDef GPIO_InitStruct;
 
 /* Chip Select pin is controlled by the SPI4 code */
 
 /* Enable GPIOE clock */
 __HAL_RCC_GPIOE_CLK_ENABLE();
 
 /* Configure PE.2 pin as output */
 GPIO_InitStruct.Pull = GPIO_PULLUP;
 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
 GPIO_InitStruct.Pin = GPIO_PIN_2;
 HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
 
 /* Configure pinout for SCK, MISO y MOSI of SPI4 */
 /*##-1- Enable peripherals and GPIO Clocks #################################*/
 /* Enable GPIO TX/RX clock and SPI4 clock*/
 __HAL_RCC_GPIOE_CLK_ENABLE(); /* SCK Port */
 __HAL_RCC_GPIOE_CLK_ENABLE(); /* MISO Port */
 __HAL_RCC_GPIOE_CLK_ENABLE(); /* MOSI Port */
 __HAL_RCC_SPI4_CLK_ENABLE();
 
 /*##-2- Configure peripheral GPIO ##########################################*/
 /* SPI SCK GPIO pin configuration */
 GPIO_InitStruct.Pin = GPIO_PIN_2;
 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
 GPIO_InitStruct.Pull = GPIO_PULLDOWN;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
 GPIO_InitStruct.Alternate = GPIO_AF5_SPI4;
 HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
 
 /* SPI MISO GPIO pin configuration */
 GPIO_InitStruct.Pin = GPIO_PIN_5;
 GPIO_InitStruct.Alternate = GPIO_AF5_SPI4;
 HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
 
 /* SPI MOSI GPIO pin configuration */
 GPIO_InitStruct.Pin = GPIO_PIN_6;
 GPIO_InitStruct.Alternate = GPIO_AF5_SPI4;
 HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
 
 /*##-1- Configure the SPI4 peripheral #######################################*/
 /* Set the SPI4 parameters */
 SpiHandle4.Instance = SPI4;
 SpiHandle4.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256;
 SpiHandle4.Init.Direction = SPI_DIRECTION_2LINES;
 SpiHandle4.Init.DataSize = SPI_DATASIZE_8BIT;
 SpiHandle4.Init.FirstBit = SPI_FIRSTBIT_MSB;
 SpiHandle4.Init.TIMode = SPI_TIMODE_DISABLE;
 SpiHandle4.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
 SpiHandle4.Init.CRCPolynomial = 7;
 SpiHandle4.Init.CRCLength = SPI_CRC_LENGTH_8BIT;
 SpiHandle4.Init.NSS = SPI_NSS_SOFT;
 SpiHandle4.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
 SpiHandle4.Init.MasterKeepIOState = SPI_MASTER_KEEP_IO_STATE_ENABLE;/* Recommended setting to avoid glitches */
 
 SpiHandle4.Init.Mode = SPI_MODE_MASTER;
 
 HAL_SPI_DeInit(&SpiHandle4);
 
 if (HAL_SPI_Init(&SpiHandle4) != HAL_OK) {
 /* Initialization Error */
 Error_Handler();
 }
}
 
void SPI4_select(void)
{
 HAL_GPIO_WritePin(GPIOE, (uint16_t)GPIO_PIN_2, GPIO_PIN_RESET);
}
 
void SPI4_deselect(void)
{
 HAL_GPIO_WritePin(GPIOE, (uint16_t)GPIO_PIN_2, GPIO_PIN_SET);
}

Each MOSI pin works as GPIO output if I configure these for this test purpose, in order to check if the pin has any electric problem.

For SPI 3 the initialization code is:

/* SPI handler 3 declaration */
SPI_HandleTypeDef SpiHandle3 __attribute__((section(".ramd2")));
 
void SPI3_Init(void)
{
 GPIO_InitTypeDef GPIO_InitStruct;
 
 /* Chip Select pin is controlled by the SPI3 code */
 
 /* Enable GPIOE clock */
 __HAL_RCC_GPIOE_CLK_ENABLE();
 
 /* Configure PE.2 pin as output */
 GPIO_InitStruct.Pull = GPIO_PULLUP;
 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
 GPIO_InitStruct.Pin = GPIO_PIN_2;
 HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
 
 /* Configure pinout for SCK, MISO y MOSI of SPI3 */
 /*##-1- Enable peripherals and GPIO Clocks #################################*/
 /* Enable GPIO TX/RX clock and SPI3 clock*/
 __HAL_RCC_GPIOC_CLK_ENABLE(); /* SCK Port */
 __HAL_RCC_GPIOC_CLK_ENABLE(); /* MISO Port */
 __HAL_RCC_GPIOC_CLK_ENABLE(); /* MOSI Port */
 __HAL_RCC_SPI3_CLK_ENABLE();
 
 /*##-2- Configure peripheral GPIO ##########################################*/
 /* SPI SCK GPIO pin configuration */
 GPIO_InitStruct.Pin = GPIO_PIN_10;
 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
 GPIO_InitStruct.Pull = GPIO_PULLDOWN;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
 GPIO_InitStruct.Alternate = GPIO_AF6_SPI3;
 HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
 
 /* SPI MISO GPIO pin configuration */
 GPIO_InitStruct.Pin = GPIO_PIN_11;
 GPIO_InitStruct.Alternate = GPIO_AF6_SPI3;
 HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
 
 /* SPI MOSI GPIO pin configuration */
 GPIO_InitStruct.Pin = GPIO_PIN_12;
 GPIO_InitStruct.Alternate = GPIO_AF6_SPI3;
 HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
 
 /*##-1- Configure the SPI3 peripheral #######################################*/
 /* Set the SPI3 parameters */
 SpiHandle3.Instance = SPI3;
 SpiHandle3.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256;
 SpiHandle3.Init.Direction = SPI_DIRECTION_2LINES;
 SpiHandle3.Init.DataSize = SPI_DATASIZE_8BIT;
 SpiHandle3.Init.FirstBit = SPI_FIRSTBIT_MSB;
 SpiHandle3.Init.TIMode = SPI_TIMODE_DISABLE;
 SpiHandle3.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
 SpiHandle3.Init.CRCPolynomial = 7;
 SpiHandle3.Init.CRCLength = SPI_CRC_LENGTH_8BIT;
 SpiHandle3.Init.NSS = SPI_NSS_SOFT;
 SpiHandle3.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
 SpiHandle3.Init.MasterKeepIOState = SPI_MASTER_KEEP_IO_STATE_ENABLE;/* Recommended setting to avoid glitches */
 SpiHandle3.Init.Mode = SPI_MODE_MASTER;
 
 HAL_SPI_DeInit(&SpiHandle3);
 
 if (HAL_SPI_Init(&SpiHandle3) != HAL_OK) {
 /* Initialization Error */
 Error_Handler();
 }
}
 
void SPI3_select(void)
{
 HAL_GPIO_WritePin(GPIOE, (uint16_t)GPIO_PIN_2, GPIO_PIN_RESET);
}
 
void SPI3_deselect(void)
{
 HAL_GPIO_WritePin(GPIOE, (uint16_t)GPIO_PIN_2, GPIO_PIN_SET);
}

Do you now what is the reason of non working MOSI pin?

Thanks for yout support mates,

This topic has been closed for replies.

waclawek.jan

Super User

SCK work?

Read out and check GPIO and SPI registers (compare to working "instances")

JW

mst0mstAuthor

Associate II

Yes, SCK work.

Also, I detected with the scope another strange bahaviour;

as you know, each SPIx_SCK pin has some alternative GPIO options;

for SPI4 I detected that SCK is provided on two GPIO at same time (when it is configured only on PE2 ¿? )

the SPI4 is configured to provide its SCK output on PE2, but the SCK signal is visible with the scope on PE2 and PE12; but PE12 is not configured at all!

I tested my own program code (you can see initialization code upside, the software chip select for SPI4 is set to PC10, not PE2; sorry for the mistake)

and the firmware examples for NUCLEO-H743ZI; on both the only working SPI is SPI1, if I change the example code to use SPI3 or 4, it performs the same way.

SPI 2 is not tested, but the interest are for SPI 3 and 4. These need to be used on a ready routed and manufactured PCB.

Thanks for the answers,

mst0mstAuthor

Associate II

the board is a NUCLEO H743ZI2

waclawek.jan

Super User

Read out and check GPIO and SPI registers

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