Hi,
I was looking at the STSW-ST25DV002 package but I am having trouble understanding what HAL i2c commands are being called. I can see the general process for enabling FTM but I am getting errors when trying to implement it myself. I have been able to read the IC reference number of the device.
From my understanding this is the process for enabling FTM:
1. Present password to start i2c session
2. Write to MB_Mode register and enable FTM
3. Write to message to the mailbox
If possible would you have a working example of using the HAL i2c commands to implement the above steps?
(I am getting HAL_ERROR)
Edit: This is what I have tried to start a i2c session
#include "stm32f1xx_hal.h"
#include "st25dv04k.h" // Include ST25DV header if available
#define ST25DV_I2C_ADDRESS 0x53 // I2C address of the ST25DV
#define I2C_PASSWORD_ADDRESS 0x0900 // I2C_PWD register address
#define I2C_SSO_DYN_ADDRESS 0x2004 // I2C_SSO_Dyn register address
#define I2C_PASSWORD_LENGTH 8 // I2C password is 64 bits (8 bytes)
// Example I2C password (stand in)
const uint8_t i2c_password[I2C_PASSWORD_LENGTH] = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08};
// Function to present the I2C password twice as per the ST25DV protocol
HAL_StatusTypeDef ST25DV_PresentI2CPassword(const uint8_t *password) {
uint8_t validation_code = 0x09; // Validation code
HAL_StatusTypeDef status;
// Send the I2C password twice, along with validation code
status = HAL_I2C_Mem_Write(&hi2c1, (ST25DV_I2C_ADDRESS << 1) | 0x02, I2C_PASSWORD_ADDRESS, I2C_MEMADD_SIZE_16BIT, (uint8_t *)password, I2C_PASSWORD_LENGTH, HAL_MAX_DELAY);
if (status != HAL_OK) return status; // Check for errors
status = HAL_I2C_Mem_Write(&hi2c1, (ST25DV_I2C_ADDRESS << 1) | 0x02, I2C_PASSWORD_ADDRESS, I2C_MEMADD_SIZE_16BIT, &validation_code, 1, HAL_MAX_DELAY);
if (status != HAL_OK) return status; // Check for errors
// Send the password again (second copy)
status = HAL_I2C_Mem_Write(&hi2c1, (ST25DV_I2C_ADDRESS << 1) | 0x02, I2C_PASSWORD_ADDRESS, I2C_MEMADD_SIZE_16BIT, (uint8_t *)password, I2C_PASSWORD_LENGTH, HAL_MAX_DELAY);
return status; // Return final status
}
// Function to check if the I2C security session is open
HAL_StatusTypeDef ST25DV_CheckI2CSessionOpen(uint8_t *session_status) {
// Read the I2C_SSO_Dyn register (dynamic register to check session status)
return HAL_I2C_Mem_Read(&hi2c1, ST25DV_I2C_ADDRESS << 1, I2C_SSO_DYN_ADDRESS, I2C_MEMADD_SIZE_16BIT, session_status, 1, HAL_MAX_DELAY);
}
int main(void) {
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_I2C1_Init();
HAL_StatusTypeDef status;
uint8_t session_status = 0x00;
// Present the I2C password to open the session
status = ST25DV_PresentI2CPassword(i2c_password);
if (status != HAL_OK) {
printf("Error presenting I2C password\n");
Error_Handler();
}
// Check if the I2C session is open by reading I2C_SSO_Dyn
status = ST25DV_CheckI2CSessionOpen(&session_status);
if (status != HAL_OK) {
printf("Error reading I2C_SSO_Dyn register\n");
Error_Handler();
}
if (session_status == 0x01) {
printf("I2C security session opened successfully\n");
} else {
printf("Failed to open I2C security session\n");
Error_Handler();
}
// Rest of the code for enabling Fast Transfer Mode (FTM) and using the mailbox...
while (1) {
// Main loop
}
}
Regards,
Isaac
