Solved
ST25R3911B SPI Issues on custom board
Hello,
I developing a board with ST25R3911B and STM32F103RFT6. Im trying to read Chip ID, but it always reads 255. On the scope i can see CS pin driven low, clock and MOSI line outputing signals, but no response on the MISO line. The solder joints look ok. Im attaching schematics, board project, soldering under the microscope and scope traces.
The communication works in loopback (when i physically short MISO and MOSI).
SCK
MOSI
CS
for(;;)
{
HAL_GPIO_WritePin(SPI1_CS_GPIO_Port, SPI1_CS_Pin, GPIO_PIN_SET);
HAL_GPIO_WritePin(SPI1_CS_GPIO_Port, SPI1_CS_Pin, GPIO_PIN_RESET);
HAL_SPI_TransmitReceive(&hspi1, txData, rxData, 2, 1000);
if (rxData[1] == 255)
{
HAL_GPIO_TogglePin(LED_STATUS1_GPIO_Port, LED_STATUS1_Pin);
HAL_GPIO_TogglePin(LED_STATUS2_GPIO_Port, LED_STATUS2_Pin);
}
else
{
HAL_GPIO_TogglePin(LED_WARNING_GPIO_Port, LED_WARNING_Pin);
HAL_GPIO_TogglePin(LED_ERROR_GPIO_Port, LED_ERROR_Pin);
}
HAL_GPIO_WritePin(SPI1_CS_GPIO_Port, SPI1_CS_Pin, GPIO_PIN_SET);
osDelay(250);
}