#ifndef FLASH_H_
#define FLASH_H_

#include <inttypes.h>

struct flash {
  volatile uint32_t ACR;      // Flash access control register
  volatile uint32_t KEYR;     // Flash key register
  volatile uint32_t OPTKEYR;  // Flash option key register
  volatile uint32_t SR;       // Flash status register
  volatile uint32_t CR;       // Flash control register
  volatile uint32_t OPTCR;    // Flash option control register
};

#define FLASH_BASE_ADDR (0x40023C00U)
#define FLASH ((struct flash *) FLASH_BASE_ADDR)

// ACR Register
// Data cache enable
#define FLASH_ACR_DCEN_BIT 10
#define FLASH_ACR_DCEN_ENABLE (1 <<FLASH_ACR_DCEN_BIT)

// Instruction cache enable
#define FLASH_ACR_ICEN_BIT 9
#define FLASH_ACR_ICEN_ENABLE (1 <<FLASH_ACR_ICEN_BIT)

// Latency
#define FLASH_ACR_LATENCY_3_WAIT_STATES (0x0111)

#define FLASH_ACR_LATENCY_BIT 0 // Bits [3:0]
#define FLASH_ACR_LATENCY_MASK (0b1111)
#define FLASH_ACR_LATENCY(latency) ((latency & FLASH_ACR_LATENCY_MASK) << FLASH_ACR_LATENCY_BIT)

#endif