MNRS-BM-BSP/include/ehrenberg/devices/qspi.h

#ifndef _DEVICES_QSPI_H
#define _DEVICES_QSPI_H

#include <stdint.h>
#include "gen/apb3spi.h"

#define qspi_t apb3spi_t
typedef struct {
    uint32_t cpol;
    uint32_t cpha;
    uint32_t mode;
    uint32_t clkDivider;
    uint32_t ssSetup;
    uint32_t ssHold;
    uint32_t ssDisable;
} spi_cfg;

#define SPI_CMD_WRITE (1 << 8)
#define SPI_CMD_READ (1 << 9)
#define SPI_CMD_SS (1 << 11)

#define SPI_RSP_VALID (1 << 31)

#define SPI_STATUS_CMD_INT_ENABLE = (1 << 0)
#define SPI_STATUS_RSP_INT_ENABLE = (1 << 1)
#define SPI_STATUS_CMD_INT_FLAG = (1 << 8)
#define SPI_STATUS_RSP_INT_FLAG = (1 << 9)

static inline void spi_configure(volatile qspi_t* reg, spi_cfg *config){
    reg->CONFIG        = (config->cpol << 0) | (config->cpha << 1) | (config->mode << 4);
    reg->SCLK_CONFIG   = config->clkDivider;
    reg->SSGEN_SETUP   = config->ssSetup;
    reg->SSGEN_HOLD    = config->ssHold;
    reg->SSGEN_DISABLE = config->ssDisable;
}

static inline void spi_init(volatile qspi_t* spi){
    spi_cfg spiCfg;
    spiCfg.cpol = 0;
    spiCfg.cpha = 0;
    spiCfg.mode = 0;
    spiCfg.clkDivider = 2;
    spiCfg.ssSetup = 2;
    spiCfg.ssHold = 2;
    spiCfg.ssDisable = 2;
    spi_configure(spi, &spiCfg);
}

static inline uint32_t spi_cmd_avail(volatile qspi_t* reg){
    return reg->STATUS & 0xFFFF;
}
static inline uint32_t spi_rsp_occupied(volatile qspi_t* reg){
    return reg->STATUS >> 16;
}

static inline void spi_write(volatile qspi_t* reg, uint8_t data){
    while(spi_cmd_avail(reg) == 0);
    reg->DATA = data | SPI_CMD_WRITE;
}

static inline uint8_t spi_write_read(volatile qspi_t* reg, uint8_t data){
    while(spi_cmd_avail(reg) == 0);
    reg->DATA = data | SPI_CMD_READ | SPI_CMD_WRITE;
    while(spi_rsp_occupied(reg) == 0);
    return reg->DATA;
}


static inline uint8_t spi_read(volatile qspi_t* reg){
    while(spi_cmd_avail(reg) == 0);
    reg->DATA = SPI_CMD_READ;
    while(spi_rsp_occupied(reg) == 0);
    while((reg->DATA & 0x80000000)==0);
    return reg->DATA;
}

static inline void spi_select(volatile qspi_t* reg, uint32_t slaveId){
    while(spi_cmd_avail(reg) == 0);
    reg->DATA = slaveId | 0x80 | SPI_CMD_SS;
}

static inline void spi_deselect(volatile qspi_t* reg, uint32_t slaveId){
    while(spi_cmd_avail(reg) == 0);
    reg->DATA = slaveId | SPI_CMD_SS;
}

static inline void spi_wait_tx_idle(volatile qspi_t* reg){
    while(spi_cmd_avail(reg) < 0x20);
}
#endif /* _DEVICES_QSPI_H */