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rt-thread-official/bsp/gd32303e-eval/drivers/drv_spi.c

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/*
* File : drv_spi.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2017 RT-Thread Develop Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2017-06-05 tanek first implementation.
* 2018-04-19 misonyo Porting for gd32f30x
*/
#include "drv_spi.h"
#include "gd32f30x.h"
#include <rtthread.h>
#if defined(RT_USING_SPI) && defined(RT_USING_PIN)
#include <rtdevice.h>
#if !defined(RT_USING_SPI0) && !defined(RT_USING_SPI1) && \
!defined(RT_USING_SPI2)
#error "Please define at least one SPIx"
#endif
/* #define DEBUG */
#ifdef DEBUG
#define DEBUG_PRINTF(...) rt_kprintf(__VA_ARGS__)
#else
#define DEBUG_PRINTF(...)
#endif
/* private rt-thread spi ops function */
static rt_err_t configure(struct rt_spi_device* device, struct rt_spi_configuration* configuration);
static rt_uint32_t xfer(struct rt_spi_device* device, struct rt_spi_message* message);
static struct rt_spi_ops gd32_spi_ops =
{
configure,
xfer
};
static rt_err_t configure(struct rt_spi_device* device, struct rt_spi_configuration* configuration)
{
spi_parameter_struct spi_init_struct;
rt_uint32_t spi_periph = (rt_uint32_t)device->bus->parent.user_data;
RT_ASSERT(device != RT_NULL);
RT_ASSERT(configuration != RT_NULL);
if(configuration->data_width <= 8)
{
spi_init_struct.frame_size = SPI_FRAMESIZE_8BIT;
}
else if(configuration->data_width <= 16)
{
spi_init_struct.frame_size = SPI_FRAMESIZE_16BIT;
}
else
{
return RT_EIO;
}
{
rcu_clock_freq_enum spi_src;
rt_uint32_t spi_apb_clock;
rt_uint32_t max_hz;
max_hz = configuration->max_hz;
DEBUG_PRINTF("sys freq: %d\n", rcu_clock_freq_get(CK_SYS));
DEBUG_PRINTF("CK_APB2 freq: %d\n", rcu_clock_freq_get(CK_APB2));
DEBUG_PRINTF("max freq: %d\n", max_hz);
if (spi_periph == SPI1 || spi_periph == SPI2)
{
spi_src = CK_APB1;
}
else
{
spi_src = CK_APB2;
}
spi_apb_clock = rcu_clock_freq_get(spi_src);
if(max_hz >= spi_apb_clock/2)
{
spi_init_struct.prescale = SPI_PSC_2;
}
else if (max_hz >= spi_apb_clock/4)
{
spi_init_struct.prescale = SPI_PSC_4;
}
else if (max_hz >= spi_apb_clock/8)
{
spi_init_struct.prescale = SPI_PSC_8;
}
else if (max_hz >= spi_apb_clock/16)
{
spi_init_struct.prescale = SPI_PSC_16;
}
else if (max_hz >= spi_apb_clock/32)
{
spi_init_struct.prescale = SPI_PSC_32;
}
else if (max_hz >= spi_apb_clock/64)
{
spi_init_struct.prescale = SPI_PSC_64;
}
else if (max_hz >= spi_apb_clock/128)
{
spi_init_struct.prescale = SPI_PSC_128;
}
else
{
/* min prescaler 256 */
spi_init_struct.prescale = SPI_PSC_256;
}
} /* baudrate */
switch(configuration->mode & RT_SPI_MODE_3)
{
case RT_SPI_MODE_0:
spi_init_struct.clock_polarity_phase = SPI_CK_PL_LOW_PH_1EDGE;
break;
case RT_SPI_MODE_1:
spi_init_struct.clock_polarity_phase = SPI_CK_PL_LOW_PH_2EDGE;
break;
case RT_SPI_MODE_2:
spi_init_struct.clock_polarity_phase = SPI_CK_PL_HIGH_PH_1EDGE;
break;
case RT_SPI_MODE_3:
spi_init_struct.clock_polarity_phase = SPI_CK_PL_HIGH_PH_2EDGE;
break;
}
/* MSB or LSB */
if(configuration->mode & RT_SPI_MSB)
{
spi_init_struct.endian = SPI_ENDIAN_MSB;
}
else
{
spi_init_struct.endian = SPI_ENDIAN_LSB;
}
spi_init_struct.trans_mode = SPI_TRANSMODE_FULLDUPLEX;
spi_init_struct.device_mode = SPI_MASTER;
spi_init_struct.nss = SPI_NSS_SOFT;
spi_init(spi_periph, &spi_init_struct);
spi_crc_off(spi_periph);
spi_enable(spi_periph);
return RT_EOK;
};
static rt_uint32_t xfer(struct rt_spi_device* device, struct rt_spi_message* message)
{
rt_base_t gd32_cs_pin = (rt_base_t)device->parent.user_data;
rt_uint32_t spi_periph = (rt_uint32_t)device->bus->parent.user_data;
struct rt_spi_configuration * config = &device->config;
RT_ASSERT(device != NULL);
RT_ASSERT(message != NULL);
/* take CS */
if(message->cs_take)
{
rt_pin_write(gd32_cs_pin, PIN_LOW);
DEBUG_PRINTF("spi take cs\n");
}
{
if(config->data_width <= 8)
{
const rt_uint8_t * send_ptr = message->send_buf;
rt_uint8_t * recv_ptr = message->recv_buf;
rt_uint32_t size = message->length;
DEBUG_PRINTF("spi poll transfer start: %d\n", size);
while(size--)
{
rt_uint8_t data = 0xFF;
if(send_ptr != RT_NULL)
{
data = *send_ptr++;
}
// Todo: replace register read/write by gd32f3 lib
//Wait until the transmit buffer is empty
while(RESET == spi_i2s_flag_get(spi_periph, SPI_FLAG_TBE));
// Send the byte
spi_i2s_data_transmit(spi_periph, data);
//Wait until a data is received
while(RESET == spi_i2s_flag_get(spi_periph, SPI_FLAG_RBNE));
// Get the received data
data = spi_i2s_data_receive(spi_periph);
if(recv_ptr != RT_NULL)
{
*recv_ptr++ = data;
}
}
DEBUG_PRINTF("spi poll transfer finsh\n");
}
else if(config->data_width <= 16)
{
const rt_uint16_t * send_ptr = message->send_buf;
rt_uint16_t * recv_ptr = message->recv_buf;
rt_uint32_t size = message->length;
while(size--)
{
rt_uint16_t data = 0xFF;
if(send_ptr != RT_NULL)
{
data = *send_ptr++;
}
//Wait until the transmit buffer is empty
while(RESET == spi_i2s_flag_get(spi_periph, SPI_FLAG_TBE));
// Send the byte
spi_i2s_data_transmit(spi_periph, data);
//Wait until a data is received
while(RESET == spi_i2s_flag_get(spi_periph, SPI_FLAG_RBNE));
// Get the received data
data = spi_i2s_data_receive(spi_periph);
if(recv_ptr != RT_NULL)
{
*recv_ptr++ = data;
}
}
}
}
/* release CS */
if(message->cs_release)
{
rt_pin_write(gd32_cs_pin, PIN_HIGH);
DEBUG_PRINTF("spi release cs\n");
}
return message->length;
};
int gd32_hw_spi_init(void)
{
int result = 0;
#ifdef RT_USING_SPI0
static struct rt_spi_bus spi_bus0;
spi_bus0.parent.user_data = (void *)SPI0;
result = rt_spi_bus_register(&spi_bus0, "spi0", &gd32_spi_ops);
rcu_periph_clock_enable(RCU_GPIOA);
rcu_periph_clock_enable(RCU_SPI0);
/* SPI0_SCK(PA5), SPI0_MISO(PA6) and SPI0_MOSI(PA7) GPIO pin configuration */
gpio_init(GPIOA, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_5 | GPIO_PIN_7);
gpio_init(GPIOA, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, GPIO_PIN_6);
#endif
#ifdef RT_USING_SPI1
static struct rt_spi_bus spi_bus1;
spi_bus1.parent.user_data = (void *)SPI1;
result = rt_spi_bus_register(&spi_bus1, "spi1", &gd32_spi_ops);
rcu_periph_clock_enable(RCU_SPI1);
rcu_periph_clock_enable(RCU_GPIOB);
/* SPI1_SCK(PB13), SPI1_MISO(PB14) and SPI1_MOSI(PB15) GPIO pin configuration */
gpio_init(GPIOB, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_13 | GPIO_PIN_15);
gpio_init(GPIOB, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, GPIO_PIN_14);
#endif
#ifdef RT_USING_SPI2
static struct rt_spi_bus spi_bus2;
spi_bus2.parent.user_data = (void *)SPI2;
result = rt_spi_bus_register(&spi_bus2, "spi2", &gd32_spi_ops);
rcu_periph_clock_enable(RCU_SPI2);
rcu_periph_clock_enable(RCU_GPIOB);
/* SPI2_SCK(PB3), SPI2_MISO(PB4) and SPI2_MOSI(PB5) GPIO pin configuration */
gpio_init(GPIOB, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_3 | GPIO_PIN_5);
gpio_init(GPIOB, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, GPIO_PIN_4);
#endif
return result;
}
INIT_BOARD_EXPORT(gd32_hw_spi_init);
#endif
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