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Hi. I am trying to communicate with flash memory via quadspi(on stm32) but I can't write any data in quadspi_dr register. It just stay 0x00000000. I relaized in quadspi_sr register I get fifo is full fault. I debugged and just when I enable quadspi, fifo becomes full. Why fifo becomes full even if I don't send any data? How do I erase it? My code is:
C:
#include "stm32l4xx.h" // Device header
void GPIO_init(){
SET_BIT(RCC->AHB2ENR, RCC_AHB2ENR_GPIOAEN); //A and B port signals
SET_BIT(RCC->AHB2ENR, RCC_AHB2ENR_GPIOBEN);
GPIOA->MODER |= (0x0000A0A0);
GPIOA->MODER &= ~(0x00005050);
GPIOB->MODER |= (0x0000000A);
GPIOB->MODER &= ~(0x00000005);
GPIOB->AFR[0] |= (0XA << GPIO_AFRL_AFSEL0_Pos); //Alternate function settings
GPIOB->AFR[0] |= (0XA << GPIO_AFRL_AFSEL1_Pos);
GPIOA->AFR[0] |= (0XA << GPIO_AFRL_AFSEL2_Pos);
GPIOA->AFR[0] |= (0XA << GPIO_AFRL_AFSEL3_Pos);
GPIOA->AFR[0] |= (0XA << GPIO_AFRL_AFSEL6_Pos);
GPIOA->AFR[0] |= (0XA << GPIO_AFRL_AFSEL7_Pos);
}
void QSPI_init()
{
SET_BIT(RCC->AHB3ENR, RCC_AHB3ENR_QSPIEN); //QSPI clock
QUADSPI->CR &= ~(QUADSPI_CR_EN); // qspi disable
RCC->AHB3RSTR |= RCC_AHB3RSTR_QSPIRST; //force reset
RCC->AHB3RSTR &= ~(RCC_AHB3RSTR_QSPIRST); //force release
QUADSPI->CR |= (QUADSPI_CR_EN); // qspi enable
QUADSPI->FCR |= 0x1F;
QUADSPI->CR |= 0x01000310;
QUADSPI->DCR |= 0x00000101; // CSHT ve CKMODE
QUADSPI->DCR |= (0x1C << 16); // memory 4Gbit
QUADSPI->DLR |= 0x03; //datalenght 4 byte
QUADSPI->DR |= 0x0000AAAA; // example data to be write
}
int main()
{
GPIO_init();
QSPI_init();
while(1)
{
QSPI_init();
}
}
