I have been trying to use the FatFS file system to create a new file on the SD card, or to read a simple txt file on the SD card. However, I seem to be running into issues after mounting the SD card. Initially, I ran code to:
- mount sd card in main
- open file in while loop
and sent value of testmount, fr via UART to confirm 1 or otherwise. I was able to receive a pass message or '1' for mount, but would not receive any of the test messages or the value of fr once the f_open line was reached.
I was unsure if I had issues with incorrectly mounting the SD card, so I then
- mounted SD card in main
- used f_getfree function to see information about volume size in main.
Likewise, I was getting 1/receiving the pass mount message, but nothing after the getfree function.
What are some reasons this could be happening? Is there an issue with how I am mounting my SD card? Are there issues elsewhere? When I use the debugger it breaks at the getfree/open functions, but I can't discern much else.
//in main
HAL_UART_Transmit(&huart1, var_test, sizeof(var_test), 1000);
//from http://elm-chan.org/fsw/ff/doc/mount.html
fs = malloc(sizeof (FATFS));
testmount = f_mount(fs, "", 0);
if (testmount != FR_OK){
HAL_UART_Transmit(&huart1, error_mount, sizeof(error_mount), 1000);
}
else {
HAL_UART_Transmit(&huart1, pass_mount, sizeof(pass_mount), 1000);
}
//from http://elm-chan.org/fsw/ff/doc/getfree.html
DWORD free_clusters;
FATFS* getFreeFs;
fres = f_getfree("", &free_clusters, &getFreeFs);
if (fres != FR_OK) {
sprintf(size, "%hu \r\n", fres);
HAL_UART_Transmit(&huart1, (uint8_t*)size, strlen(size), 1000);
}
while (1)
{
HAL_Delay(1000);
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_10, GPIO_PIN_RESET);
HAL_Delay(300);
HAL_UART_Transmit(&huart1, tx_buff3, sizeof(tx_buff3), 1000);
fr = f_open(&fil, "write.txt", FA_CREATE_ALWAYS);
sprintf(msg, "%hu \r\n", fr);
HAL_UART_Transmit(&huart1, (uint8_t*)msg, strlen(msg), 1000);
HAL_UART_Transmit(&huart1, tx_buff4, sizeof(tx_buff4), 1000); //this is not
if (fr != FR_OK) {
HAL_UART_Transmit(&huart1, fail_open, sizeof(fail_open), 1000);
}
else {
HAL_UART_Transmit(&huart1, pass_open, sizeof(pass_open), 1000);
}
//f_puts("Hello \n", &fil);
f_close(&fil);
f_mount(0, "", 0);
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_10, GPIO_PIN_SET);
HAL_Delay(500);
}
