I have a application with STM32F429ZI and SD card withour RTOS.
I have a llong time for write in a SD card.
The rcvr_datablock routine is loong about 3 ms between set and reset LED !!!
It is possible to reduce this time using rot_rdq without use a RTOS ?
Thanks
/*-----------------------------------------------------------------------*/
/* Receive a data packet from the MMC */
/*-----------------------------------------------------------------------*/
static
int rcvr_datablock ( /* 1:OK, 0:Error */
BYTE *buff, /* Data buffer */
UINT btr /* Data block length (byte) */
)
{
BYTE token;
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_8, GPIO_PIN_SET); // debugga LED AUX1
SPI_Timer_On(200);
do { /* Wait for DataStart token in timeout of 200ms */
token = xchg_spi(0xFF);
/* This loop will take a time. Insert rot_rdq() here for multitask envilonment. */
} while ((token == 0xFF) && SPI_Timer_Status());
if(token != 0xFE) return 0; /* Function fails if invalid DataStart token or timeout */
rcvr_spi_multi(buff, btr); /* Store trailing data to the buffer */
xchg_spi(0xFF); xchg_spi(0xFF); /* Discard CRC */
HAL_GPIO_WritePin(GPIOA, GPIO_PIN_8, GPIO_PIN_RESET); // debugga LED AUX1
return 1; /* Function succeeded */
}
