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rt-thread-official/bsp/at32/libraries/rt_drivers/drv_spi.c

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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-05-16 shelton first version
*/
#include "drv_common.h"
#include "drv_spi.h"
#ifdef RT_USING_SPI
#if !defined(BSP_USING_SPI1) && !defined(BSP_USING_SPI2) && \
!defined(BSP_USING_SPI3) && !defined(BSP_USING_SPI4)
#error "Please define at least one BSP_USING_SPIx"
#endif
#define ARR_LEN(__N) (sizeof(__N) / sizeof(__N[0]))
//#define DRV_DEBUG
#define LOG_TAG "drv.pwm"
#include <drv_log.h>
/* 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 at32_spi_ops =
{
configure,
xfer
};
/**
* attach the spi device to spi bus, this function must be used after initialization.
*/
rt_err_t rt_hw_spi_device_attach(const char *bus_name, const char *device_name, gpio_type *cs_gpiox, uint16_t cs_gpio_pin)
{
gpio_init_type gpio_init_struct;
RT_ASSERT(bus_name != RT_NULL);
RT_ASSERT(device_name != RT_NULL);
rt_err_t result;
struct rt_spi_device *spi_device;
struct at32_spi_cs *cs_pin;
/* initialize the cs pin & select the slave*/
gpio_default_para_init(&gpio_init_struct);
gpio_init_struct.gpio_pins = cs_gpio_pin;
gpio_init_struct.gpio_mode = GPIO_MODE_OUTPUT;
gpio_init_struct.gpio_out_type = GPIO_OUTPUT_PUSH_PULL;
gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
gpio_init(cs_gpiox, &gpio_init_struct);
gpio_bits_set(cs_gpiox, cs_gpio_pin);
/* attach the device to spi bus */
spi_device = (struct rt_spi_device *)rt_malloc(sizeof(struct rt_spi_device));
RT_ASSERT(spi_device != RT_NULL);
cs_pin = (struct at32_spi_cs *)rt_malloc(sizeof(struct at32_spi_cs));
RT_ASSERT(cs_pin != RT_NULL);
cs_pin->gpio_x = cs_gpiox;
cs_pin->gpio_pin = cs_gpio_pin;
result = rt_spi_bus_attach_device(spi_device, device_name, bus_name, (void *)cs_pin);
if (result != RT_EOK)
{
LOG_D("%s attach to %s faild, %d\n", device_name, bus_name, result);
}
RT_ASSERT(result == RT_EOK);
LOG_D("%s attach to %s done", device_name, bus_name);
return result;
}
static rt_err_t configure(struct rt_spi_device* device,
struct rt_spi_configuration* configuration)
{
struct rt_spi_bus * spi_bus = (struct rt_spi_bus *)device->bus;
struct at32_spi *spi_instance = (struct at32_spi *)spi_bus->parent.user_data;
spi_init_type spi_init_struct;
RT_ASSERT(device != RT_NULL);
RT_ASSERT(configuration != RT_NULL);
at32_msp_spi_init(spi_instance->config->spi_x);
/* data_width */
if(configuration->data_width <= 8)
{
spi_init_struct.frame_bit_num = SPI_FRAME_8BIT;
}
else if(configuration->data_width <= 16)
{
spi_init_struct.frame_bit_num = SPI_FRAME_16BIT;
}
else
{
return RT_EIO;
}
/* baudrate */
{
uint32_t spi_apb_clock;
uint32_t max_hz;
crm_clocks_freq_type clocks_struct;
max_hz = configuration->max_hz;
crm_clocks_freq_get(&clocks_struct);
LOG_D("sys freq: %d\n", clocks_struct.sclk_freq);
LOG_D("max freq: %d\n", max_hz);
if (spi_instance->config->spi_x == SPI1)
{
spi_apb_clock = clocks_struct.apb2_freq;
LOG_D("pclk2 freq: %d\n", clocks_struct.apb2_freq);
}
else
{
spi_apb_clock = clocks_struct.apb1_freq;
LOG_D("pclk1 freq: %d\n", clocks_struct.apb1_freq);
}
if(max_hz >= (spi_apb_clock / 2))
{
spi_init_struct.mclk_freq_division = SPI_MCLK_DIV_2;
}
else if (max_hz >= (spi_apb_clock / 4))
{
spi_init_struct.mclk_freq_division = SPI_MCLK_DIV_4;
}
else if (max_hz >= (spi_apb_clock / 8))
{
spi_init_struct.mclk_freq_division = SPI_MCLK_DIV_8;
}
else if (max_hz >= (spi_apb_clock / 16))
{
spi_init_struct.mclk_freq_division = SPI_MCLK_DIV_16;
}
else if (max_hz >= (spi_apb_clock / 32))
{
spi_init_struct.mclk_freq_division = SPI_MCLK_DIV_32;
}
else if (max_hz >= (spi_apb_clock / 64))
{
spi_init_struct.mclk_freq_division = SPI_MCLK_DIV_64;
}
else if (max_hz >= (spi_apb_clock / 128))
{
spi_init_struct.mclk_freq_division = SPI_MCLK_DIV_128;
}
else
{
/* min prescaler 256 */
spi_init_struct.mclk_freq_division = SPI_MCLK_DIV_256;
}
} /* baudrate */
switch(configuration->mode & RT_SPI_MODE_3)
{
case RT_SPI_MODE_0:
spi_init_struct.clock_phase = SPI_CLOCK_PHASE_1EDGE;
spi_init_struct.clock_polarity = SPI_CLOCK_POLARITY_LOW;
break;
case RT_SPI_MODE_1:
spi_init_struct.clock_phase = SPI_CLOCK_PHASE_2EDGE;
spi_init_struct.clock_polarity = SPI_CLOCK_POLARITY_LOW;
break;
case RT_SPI_MODE_2:
spi_init_struct.clock_phase = SPI_CLOCK_PHASE_1EDGE;
spi_init_struct.clock_polarity = SPI_CLOCK_POLARITY_HIGH;
break;
case RT_SPI_MODE_3:
spi_init_struct.clock_phase = SPI_CLOCK_PHASE_2EDGE;
spi_init_struct.clock_polarity = SPI_CLOCK_POLARITY_HIGH;
break;
}
/* msb or lsb */
if(configuration->mode & RT_SPI_MSB)
{
spi_init_struct.first_bit_transmission = SPI_FIRST_BIT_MSB;
}
else
{
spi_init_struct.first_bit_transmission = SPI_FIRST_BIT_LSB;
}
spi_init_struct.transmission_mode = SPI_TRANSMIT_FULL_DUPLEX;
spi_init_struct.master_slave_mode = SPI_MODE_MASTER;
spi_init_struct.cs_mode_selection = SPI_CS_SOFTWARE_MODE;
/* init spi */
spi_init(spi_instance->config->spi_x, &spi_init_struct);
/* enable spi */
spi_enable(spi_instance->config->spi_x, TRUE);
/* disable spi crc */
spi_crc_enable(spi_instance->config->spi_x, FALSE);
return RT_EOK;
};
static rt_uint32_t xfer(struct rt_spi_device* device, struct rt_spi_message* message)
{
struct rt_spi_bus * at32_spi_bus = (struct rt_spi_bus *)device->bus;
struct at32_spi *spi_instance = (struct at32_spi *)at32_spi_bus->parent.user_data;
struct rt_spi_configuration * config = &device->config;
struct at32_spi_cs * at32_spi_cs = device->parent.user_data;
RT_ASSERT(device != NULL);
RT_ASSERT(message != NULL);
/* take cs */
if(message->cs_take)
{
gpio_bits_reset(at32_spi_cs->gpio_x, at32_spi_cs->gpio_pin);
LOG_D("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;
LOG_D("spi poll transfer start: %d\n", size);
while(size--)
{
rt_uint8_t data = 0xFF;
if(send_ptr != RT_NULL)
{
data = *send_ptr++;
}
/* wait until the transmit buffer is empty */
while(spi_i2s_flag_get(spi_instance->config->spi_x, SPI_I2S_TDBE_FLAG) == RESET);
/* send the byte */
spi_i2s_data_transmit(spi_instance->config->spi_x, data);
/* wait until a data is received */
while(spi_i2s_flag_get(spi_instance->config->spi_x, SPI_I2S_RDBF_FLAG) == RESET);
/* get the received data */
data = spi_i2s_data_receive(spi_instance->config->spi_x);
if(recv_ptr != RT_NULL)
{
*recv_ptr++ = data;
}
}
LOG_D("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(spi_i2s_flag_get(spi_instance->config->spi_x, SPI_I2S_TDBE_FLAG) == RESET);
/* send the byte */
spi_i2s_data_transmit(spi_instance->config->spi_x, data);
/* wait until a data is received */
while(spi_i2s_flag_get(spi_instance->config->spi_x, SPI_I2S_RDBF_FLAG) == RESET);
/* get the received data */
data = spi_i2s_data_receive(spi_instance->config->spi_x);
if(recv_ptr != RT_NULL)
{
*recv_ptr++ = data;
}
}
}
/* release cs */
if(message->cs_release)
{
gpio_bits_set(at32_spi_cs->gpio_x, at32_spi_cs->gpio_pin);
LOG_D("spi release cs\n");
}
return message->length;
};
static struct at32_spi_config configs[] = {
#ifdef BSP_USING_SPI1
{SPI1, "spi1"},
#endif
#ifdef BSP_USING_SPI2
{SPI2, "spi2"},
#endif
#ifdef BSP_USING_SPI3
{SPI3, "spi3"},
#endif
#ifdef BSP_USING_SPI4
{SPI4, "spi4"},
#endif
};
static struct at32_spi spis[sizeof(configs) / sizeof(configs[0])] = {0};
int rt_hw_spi_init(void)
{
int i;
rt_err_t result;
rt_size_t obj_num = sizeof(spis) / sizeof(struct at32_spi);
for (i = 0; i < obj_num; i++)
{
spis[i].config = &configs[i];
spis[i].spi_bus.parent.user_data = (void *)&spis[i];
result = rt_spi_bus_register(&(spis[i].spi_bus), spis[i].config->spi_name, &at32_spi_ops);
}
return result;
}
INIT_BOARD_EXPORT(rt_hw_spi_init);
#endif
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