#include <string.h>
#include "spi.h"
/*
* spi driver for MS5238 and CS1180
*/
void spi0_init(void){
	rcu_periph_clock_enable(RCU_GPIOA);
	rcu_periph_clock_enable(RCU_GPIOB);
	rcu_periph_clock_enable(RCU_SPI0);
	//spi clk
	gpio_mode_output(GPIOB, GPIO_PUPD_NONE, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_3);
	//spi MISO
	gpio_mode_input(GPIOB, GPIO_PUPD_NONE, GPIO_PIN_4);
	//spi MOSI
	gpio_mode_output(GPIOB, GPIO_PUPD_NONE, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_5);
	gpio_af_set(GPIOB, GPIO_AF_0, GPIO_PIN_3);
	gpio_af_set(GPIOB, GPIO_AF_0, GPIO_PIN_4);
	gpio_af_set(GPIOB, GPIO_AF_0, GPIO_PIN_5);

	//MS5238 cs
	gpio_mode_output(GPIOA, GPIO_PUPD_NONE, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_15);
	ms5238_cs(1);
	//CS1180 cs
	gpio_mode_output(GPIOA, GPIO_PUPD_NONE, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_9);
	cs1180_cs(1);

	spi_parameter_struct spi_init_struct;

    /* SPI0 parameter config */
    spi_init_struct.trans_mode           = SPI_TRANSMODE_FULLDUPLEX;
    spi_init_struct.device_mode          = SPI_MASTER;;
    spi_init_struct.frame_size           = SPI_FRAMESIZE_16BIT;
    spi_init_struct.clock_polarity_phase = SPI_CK_PL_LOW_PH_1EDGE;
    spi_init_struct.nss                  = SPI_NSS_SOFT;
    spi_init_struct.prescale             = SPI_PSC_2 ;
    spi_init_struct.endian               = SPI_ENDIAN_MSB;
    spi_init(SPI0, &spi_init_struct);

    /* set crc polynomial */
    spi_crc_polynomial_set(SPI0,7);
    /* enable SPI0 */
    spi_enable(SPI0);	
}


void spi0_deinit(void){
	spi_disable(SPI0);
	rcu_periph_clock_disable(RCU_SPI0);
}

#define max_wait_count 1024
int spi0_send_uint16(uint16_t s_data, uint8_t *r_data)
{
    /* loop while data register in not emplty */
	int count = 0;
    while (RESET == spi_i2s_flag_get(SPI0,SPI_FLAG_TBE) && count < max_wait_count){
		count ++;
	};
	if (RESET == spi_i2s_flag_get(SPI0,SPI_FLAG_TBE)){
		return -1;
	}
    /* send byte through the SPI0 peripheral */
    spi_i2s_data_transmit(SPI0,s_data);

    /* wait to receive a byte */
	count = 0;
    while(RESET == spi_i2s_flag_get(SPI0,SPI_FLAG_RBNE) && count < max_wait_count){
		count ++;
	};
	if (RESET == spi_i2s_flag_get(SPI0,SPI_FLAG_RBNE)){
		return -1;
	}
    /* return the byte read from the SPI bus */
	uint8_t r = spi_i2s_data_receive(SPI0);
	if (r_data != NULL){
		*r_data = r;
	}
    return 0;
}