spi.c

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/**************************************************************************/
#include "spi.h"
#include "gd32f1x0.h"
#include "config.h"
 
unsigned short spi_readwrite_halfworld(unsigned short data) {
    unsigned short buffer;
    while (RESET == spi_i2s_flag_get(SPI0, SPI_FLAG_TBE));
 
    /* send this data through spi0 */
    spi_i2s_data_transmit(SPI0, data);
    while (RESET == spi_i2s_flag_get(SPI0, SPI_FLAG_RBNE));
 
    /* get data received through spi0 */
    buffer = spi_i2s_data_receive(SPI0);
    return buffer;
}
 
void spi_config(void) {
    spi_parameter_struct spi_init_struct;
 
    /* enable GPIO clock and SPI0 clock*/
    rcu_periph_clock_enable(RCU_GPIOA);
    rcu_periph_clock_enable(RCU_SPI0);
 
    /* SPI0 GPIO config: SCK/PA5, MISO/PA6, MOSI/PA7 */
    gpio_af_set(GPIOA, GPIO_AF_0, GPIO_PIN_5 | GPIO_PIN_6 | GPIO_PIN_7);
    gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_5 | GPIO_PIN_6 | GPIO_PIN_7);
    gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_5 | GPIO_PIN_6 | GPIO_PIN_7);
 
    /* SPI0 GPIO config: CS/PA4 */
    gpio_mode_set(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN_4);
    gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_4);
 
    /* pull up CS pin to end sending data */
    gpio_bit_set(GPIOA, GPIO_PIN_4);
 
    /* 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_2EDGE;
    spi_init_struct.nss = SPI_NSS_SOFT;
    spi_init_struct.prescale = SPI_PRESCALE;
    spi_init_struct.endian = SPI_ENDIAN_MSB;
    spi_crc_off(SPI0);
    spi_init(SPI0, &spi_init_struct);
 
    /* SPI0 enable */
    spi_enable(SPI0);
}