Hi everyone!
It's my first post and I'm trying to make something with the SPI but I met the problems. Even if I configure the interface (hopefully correctly), I can't communicate with any SPI device. I bought BMP280 as a simple sensor to communicate with. What I'm trying to do is to read DevID. It should be done by writing 0xD0 and then reading a byte (expected 0x58).
But it's not working at all. Using logic-level analyzer I have noticed something weird - bytes sent by SPI are delayed by about half a period of the signal. About, because it's not equal between the next attempts... I have set CPOL=CPHA=0 on both STM32H7 and the analyzer. If I change one side to CPOL=0 && CPHA=1 then I get the expected data (decoded) but only sometimes and only on the MOSI (0xD0 sent). The screens below show both situations.
CPOL=CPHA=0 Both
CPOL=0 CPOHA=1 One side
I have checked connections, I have checked the sensor (with the different MCU, not STM), and I have checked different pin configurations. I even tried to use AruinoSPI with PlatformioIDE. No matter what am I doing I'm getting similar results - random bits on the SPI...
I have also checked errata (2.22) for this MCU [Errata URL] but I don't think that anything is similar to my "problem".
I was looking for hints in the datasheet and application notes without success. I saw
Could you please take a look at my code? I believe I missed something key but I have no idea what it could be...
Please let me know if you have any advice. If somebody could share a similar sample (nucleo+simple, single SPI sensor, or even SD card) I would be grateful.
My setup:
- Nucleo-H743ZI2
- BMP280
- CubeIDE Version: 1.14.0 Build: 19471_20231121_1200 (UTC)
- FW: STM32Cube FW_H7 V1.11.1 (V1.11.0 has no difference)
I am attaching .tar and .7z libraries with my entire project. Most of the code is generated by CubeMX.
Crucial fragments are below:
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Supply configuration update enable
*/
HAL_PWREx_ConfigSupply(PWR_LDO_SUPPLY);
/** Configure the main internal regulator output voltage
*/
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3);
while(!__HAL_PWR_GET_FLAG(PWR_FLAG_VOSRDY)) {}
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS;
RCC_OscInitStruct.HSIState = RCC_HSI_DIV4;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM = 1;
RCC_OscInitStruct.PLL.PLLN = 24;
RCC_OscInitStruct.PLL.PLLP = 2;
RCC_OscInitStruct.PLL.PLLQ = 48;
RCC_OscInitStruct.PLL.PLLR = 2;
RCC_OscInitStruct.PLL.PLLRGE = RCC_PLL1VCIRANGE_3;
RCC_OscInitStruct.PLL.PLLVCOSEL = RCC_PLL1VCOWIDE;
RCC_OscInitStruct.PLL.PLLFRACN = 0;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2
|RCC_CLOCKTYPE_D3PCLK1|RCC_CLOCKTYPE_D1PCLK1;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB3CLKDivider = RCC_APB3_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_APB2_DIV1;
RCC_ClkInitStruct.APB4CLKDivider = RCC_APB4_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
{
Error_Handler();
}
}int main(void)
{
/* MCU Configuration--------------------------------------------------------*/
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_USART3_UART_Init();
MX_SPI2_Init();
printf("Start\n");
HAL_Delay(1000);
while (!((SPI2->SR)&SPI_SR_TXP)) {};
SPI2->CR2 |= (SPI_CR2_TSIZE & 2); // Config size 1
SPI2->CR1 |= SPI_CR1_SPE; //Enable SPI
SPI2->CR1 |= SPI_CR1_CSTART; //Start transaction
HAL_GPIO_WritePin(BMP_CS_GPIO_Port, BMP_CS_Pin, 0);
HAL_Delay(1);
printf("CS 0\n");
uint8_t temp = 0;
if(SPI2->SR & SPI_SR_TXP) // Enough space in FIFO
{
SPI2->TXDR = 0xd0 | 0x80;
while (!((SPI2->SR)&SPI_SR_TXP)) {};
SPI2->TXDR = 0xff;
printf("DR loaded 0x0d\n");
while (!((SPI2->SR)&SPI_SR_RXP)) {}; //Waiting for rcv in fifo
temp = SPI2->RXDR;
printf("Dummy 0x%02x\n", temp);
temp = SPI2->RXDR;
printf("Got 0x%02x\n", temp);
}
while(!(SPI2->SR & SPI_SR_EOT)){}; //Wait for end of transaction
printf("SR empty EOT flag\n");
SPI2->CR1 &= ~SPI_CR1_SPE; //Disable SPI
while (1)
{
}
}void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOC_CLK_ENABLE();
__HAL_RCC_GPIOH_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
__HAL_RCC_GPIOD_CLK_ENABLE();
__HAL_RCC_GPIOE_CLK_ENABLE();
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(GPIOB, LD1_Pin|LD3_Pin, GPIO_PIN_RESET);
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(BMP_CS_GPIO_Port, BMP_CS_Pin, GPIO_PIN_SET);
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(LD2_GPIO_Port, LD2_Pin, GPIO_PIN_RESET);
/*Configure GPIO pin : PtPin */
GPIO_InitStruct.Pin = B1_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(B1_GPIO_Port, &GPIO_InitStruct);
/*Configure GPIO pins : PBPin PBPin */
GPIO_InitStruct.Pin = LD1_Pin|LD3_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
/*Configure GPIO pin : PtPin */
GPIO_InitStruct.Pin = BMP_CS_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_MEDIUM;
HAL_GPIO_Init(BMP_CS_GPIO_Port, &GPIO_InitStruct);
/*Configure GPIO pin : PtPin */
GPIO_InitStruct.Pin = LD2_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(LD2_GPIO_Port, &GPIO_InitStruct);
}void MX_SPI2_Init(void)
{
hspi2.Instance = SPI2;
hspi2.Init.Mode = SPI_MODE_MASTER;
hspi2.Init.Direction = SPI_DIRECTION_2LINES;
hspi2.Init.DataSize = SPI_DATASIZE_8BIT;
hspi2.Init.CLKPolarity = SPI_POLARITY_LOW;
hspi2.Init.CLKPhase = SPI_PHASE_1EDGE;
hspi2.Init.NSS = SPI_NSS_SOFT;
hspi2.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256;
hspi2.Init.FirstBit = SPI_FIRSTBIT_MSB;
hspi2.Init.TIMode = SPI_TIMODE_DISABLE;
hspi2.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
hspi2.Init.CRCPolynomial = 0x0;
hspi2.Init.NSSPMode = SPI_NSS_PULSE_ENABLE;
hspi2.Init.NSSPolarity = SPI_NSS_POLARITY_LOW;
hspi2.Init.FifoThreshold = SPI_FIFO_THRESHOLD_01DATA;
hspi2.Init.TxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
hspi2.Init.RxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
hspi2.Init.MasterSSIdleness = SPI_MASTER_SS_IDLENESS_00CYCLE;
hspi2.Init.MasterInterDataIdleness = SPI_MASTER_INTERDATA_IDLENESS_00CYCLE;
hspi2.Init.MasterReceiverAutoSusp = SPI_MASTER_RX_AUTOSUSP_DISABLE;
hspi2.Init.MasterKeepIOState = SPI_MASTER_KEEP_IO_STATE_DISABLE;
hspi2.Init.IOSwap = SPI_IO_SWAP_DISABLE;
if (HAL_SPI_Init(&hspi2) != HAL_OK)
{
Error_Handler();
}
}
1 ACCEPTED SOLUTION
Accepted Solutions
I have followed your advice but it's not the problem. Okay - this time I've got proper readings every time (0xD0 on MOSI) but ONLY if I set CPOL=0 && CPHA=1 on the one side.
I'm using module from Botland and here's the Datasheet.
The connection is:
STM32 | BMP
PC2_C -> SD0 (MISO)
PC3_C -> SDA(MOSI)
PD3 -> SCL
PB9 -> CSB
3V3 -> VCC
GND -> GND
But as I mentioned - the behavior without the sensor is similar. Short peaks on the MOSI line are also confusing for me.
My previous answer in measured without BMP connected. Only the logic-level analyzer and board.
@Sebastiaan I decided to use registers instead of HAL because I had the same problems with it so I thought maybe something was wrong with SDK.
I have changed main() to HAL:
int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_USART3_UART_Init();
MX_SPI2_Init();
printf("Start\n");
HAL_Delay(1000);
uint8_t tx_data[32], rx_data[32];
tx_data[0] = 0xd0;
tx_data[1] = 0xff;
HAL_GPIO_WritePin(BMP_CS_GPIO_Port, BMP_CS_Pin, 0);
HAL_Delay(100);
HAL_SPI_TransmitReceive(&hspi2, tx_data, rx_data, 2, HAL_MAX_DELAY);
HAL_GPIO_WritePin(BMP_CS_GPIO_Port, BMP_CS_Pin, 1);
while (1)
{
}
}But the result is similar (peaks and mismatches in CPOL/CPHA)
@TDK I have changed main to toggle the pins:
MX_GPIO_Init()
{
...
/*Configure GPIO pins : PC2 PC3 */
GPIO_InitStruct.Pin = GPIO_PIN_2|GPIO_PIN_3;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_MEDIUM;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
...
}int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_USART3_UART_Init();
printf("Start\n");
HAL_Delay(1000);
for(int i = 0; i < 16; i++)
{
HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_2);
HAL_Delay(1);
}
while(1){}
}And something happened... I've peaks on MOSI, switching MISO
But everything is okay while switching MOSI
So It's not short between lines. It happens even if I disconnect MISO from the analyzer while switching.
Sorry, but I forgot about it before. Switching SCK also results in MOSI peaks.
I'm using Nucleo-H743ZI2 (NUH743ZI$AT3). I looked at the schematics before I posted (schematics). Nothing is connected to PC2/3 or PD3. PD3 can be used with USART as a CTS but I'm not using Flow Control. To make sure I removed USART from my code but nothing changed (peaks are present as above).
Just for the test, I have switched to Hardware NSS but nothing changed.
(CPOL=0 && CPHA=1)
