libs/rt-thread-official
libs
/
rt-thread-official
mirror of https://github.com/RT-Thread/rt-thread.git
4
0
Fork 0
Code Issues Releases Wiki Activity
rt-thread-official/bsp/allwinner_tina/drivers/spi/drv_spi.c

775 lines
17 KiB
C
Raw Blame History

/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2017-08-30 tanek first implementation.
*/
#include <rtthread.h>
#include <rthw.h>
#include <rtdevice.h>
#include <stdbool.h>
#include "drv_spi.h"
#include "drv_gpio.h"
#include "drv_clock.h"
#define SPI_BUS_MAX_CLK (30 * 1000 * 1000)
//#define DEBUG
#define DBG_TAG "SPI"
#ifdef DEBUG
#define DBG_LVL DBG_LOG
#else
#define DBG_LVL DBG_WARNING
#endif /* DEBUG */
#include <rtdbg.h>
#ifdef RT_USING_SPI
#define ARR_LEN(__N) (sizeof(__N) / sizeof(__N[0]))
#define __SPI_STATIC_INLINE__ rt_inline
/*
* @brief Hardware Layer Interface
*/
__SPI_STATIC_INLINE__
rt_uint32_t SPI_GetVersion(SPI_T *spi)
{
return spi->VER;
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_Reset(SPI_T *spi)
{
HAL_SET_BIT(spi->CTRL, SPI_CTRL_RST_MASK);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_SetMode(SPI_T *spi, SPI_CTRL_Mode mode)
{
HAL_MODIFY_REG(spi->CTRL, SPI_CTRL_MODE_MASK, mode);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_Enable(SPI_T *spi)
{
HAL_SET_BIT(spi->CTRL, SPI_CTRL_EN_MASK);
}
__SPI_STATIC_INLINE__
void SPI_Disable(SPI_T *spi)
{
HAL_CLR_BIT(spi->CTRL, SPI_CTRL_EN_MASK);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_StartTransmit(SPI_T *spi)
{
HAL_SET_BIT(spi->TCTRL, SPI_TCTRL_XCH_MASK);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_SetFirstTransmitBit(SPI_T *spi, SPI_TCTRL_Fbs bit)
{
HAL_MODIFY_REG(spi->TCTRL, SPI_TCTRL_FBS_MASK, bit);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_EnableRapidsMode(SPI_T *spi, bool delay_sample)
{
HAL_SET_BIT(spi->TCTRL, SPI_TCTRL_RPSM_MASK);
HAL_MODIFY_REG(spi->TCTRL, SPI_TCTRL_SDC_MASK, delay_sample << SPI_TCTRL_SDC_SHIFT);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_DisableRapidsMode(SPI_T *spi)
{
HAL_CLR_BIT(spi->TCTRL, SPI_TCTRL_RPSM_MASK);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_SetDuplex(SPI_T *spi, SPI_TCTRL_DHB_Duplex duplex)
{
HAL_MODIFY_REG(spi->TCTRL, SPI_TCTRL_DHB_MASK, duplex);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_SetCsLevel(SPI_T *spi, bool level)
{
HAL_MODIFY_REG(spi->TCTRL, SPI_TCTRL_SS_LEVEL_MASK, level << SPI_TCTRL_SS_LEVEL_SHIFT);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_ManualChipSelect(SPI_T *spi, SPI_TCTRL_SS_Sel cs)
{
HAL_SET_BIT(spi->TCTRL, SPI_TCTRL_SS_OWNER_MASK);
HAL_MODIFY_REG(spi->TCTRL, SPI_TCTRL_SS_SEL_MASK, cs);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_AutoChipSelect(SPI_T *spi, SPI_TCTRL_SS_Sel cs, bool cs_remain)
{
HAL_MODIFY_REG(spi->TCTRL, SPI_TCTRL_SS_SEL_MASK, cs);
HAL_CLR_BIT(spi->TCTRL, SPI_TCTRL_SS_OWNER_MASK);
HAL_MODIFY_REG(spi->TCTRL, SPI_TCTRL_SS_CTL_MASK, (!cs_remain) << SPI_TCTRL_SS_CTL_SHIFT);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_SetCsIdle(SPI_T *spi, bool idle)
{
HAL_MODIFY_REG(spi->TCTRL, SPI_TCTRL_SPOL_MASK, (!!idle) << SPI_TCTRL_SPOL_SHIFT);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_SetSclkMode(SPI_T *spi, SPI_SCLK_Mode mode)
{
HAL_MODIFY_REG(spi->TCTRL, SPI_TCTRL_CPOL_MASK | SPI_TCTRL_CPHA_MASK, mode);
}
typedef enum
{
SPI_INT_CS_DESELECT = SPI_IER_SS_INT_EN_MASK,
SPI_INT_TRANSFER_COMPLETE = SPI_IER_TC_INT_EN_MASK,
SPI_INT_TXFIFO_UNDER_RUN = SPI_IER_TF_UDR_INT_EN_MASK,
SPI_INT_TXFIFO_OVERFLOW = SPI_IER_TF_OVF_INT_EN_MASK,
SPI_INT_RXFIFO_UNDER_RUN = SPI_IER_RF_UDR_INT_EN_MASK,
SPI_INT_RXFIFO_OVERFLOW = SPI_IER_RF_OVF_INT_EN_MASK,
SPI_INT_TXFIFO_FULL = SPI_IER_TF_FUL_INT_EN_MASK,
SPI_INT_TXFIFO_EMPTY = SPI_IER_TX_EMP_INT_EN_MASK,
SPI_INT_TXFIFO_READY = SPI_IER_TX_ERQ_INT_EN_MASK,
SPI_INT_RXFIFO_FULL = SPI_IER_RF_FUL_INT_EN_MASK,
SPI_INT_RXFIFO_EMPTY = SPI_IER_RX_EMP_INT_EN_MASK,
SPI_INT_RXFIFO_READY = SPI_IER_RF_RDY_INT_EN_MASK
} SPI_Int_Type;
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_EnableInt(SPI_T *spi, SPI_Int_Type type)
{
HAL_SET_BIT(spi->IER, type);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_DisableInt(SPI_T *spi, SPI_Int_Type type)
{
HAL_CLR_BIT(spi->IER, type);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
bool SPI_IntState(SPI_T *spi, SPI_Int_Type type)
{
return !!HAL_GET_BIT(spi->STA, type);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
bool SPI_ClearInt(SPI_T *spi, SPI_Int_Type type)
{
HAL_SET_BIT(spi->STA, type);
return HAL_GET_BIT(spi->STA, type);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_DebugReadTx(SPI_T *spi, rt_uint32_t *data)
{
// tbc...
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_DebugWriteRx(SPI_T *spi, rt_uint32_t *data)
{
// tbc...
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_ResetTxFifo(SPI_T *spi)
{
HAL_SET_BIT(spi->FCTL, SPI_FCTL_TF_RST_MASK);
while (HAL_GET_BIT(spi->FCTL, SPI_FCTL_TF_RST_MASK) != 0);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_ResetRxFifo(SPI_T *spi)
{
HAL_SET_BIT(spi->FCTL, SPI_FCTL_RF_RST_MASK);
while (HAL_GET_BIT(spi->FCTL, SPI_FCTL_RF_RST_MASK) != 0);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_DMA(SPI_T *spi, bool txEn, bool rxEn)
{
HAL_MODIFY_REG(spi->FCTL,
SPI_FCTL_TF_DRQ_EN_MASK | SPI_FCTL_RF_DRQ_EN_MASK,
((!!txEn) << SPI_FCTL_TF_DRQ_EN_SHIFT) | ((!!rxEn) << SPI_FCTL_RF_DRQ_EN_SHIFT));
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_SetTxFifoThreshold(SPI_T *spi, rt_uint8_t threshold)
{
HAL_MODIFY_REG(spi->FCTL, SPI_FCTL_TX_TRIG_LEVEL_MASK, threshold << SPI_FCTL_TX_TRIG_LEVEL_SHIFT);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_SetRxFifoThreshold(SPI_T *spi, rt_uint8_t threshold)
{
HAL_MODIFY_REG(spi->FCTL, SPI_FCTL_RX_TRIG_LEVEL_MASK, threshold << SPI_FCTL_RX_TRIG_LEVEL_SHIFT);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
rt_uint8_t SPI_GetTxFifoCounter(SPI_T *spi)
{
return (rt_uint8_t)((spi->FST & SPI_FST_TF_CNT_MASK) >> SPI_FST_TF_CNT_SHIFT);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
rt_uint8_t SPI_GetRxFifoCounter(SPI_T *spi)
{
return (rt_uint8_t)((spi->FST & SPI_FST_RF_CNT_MASK) >> SPI_FST_RF_CNT_SHIFT);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_EnableDualMode(SPI_T *spi)
{
HAL_SET_BIT(spi->BCC, SPI_BCC_DRM_MASK);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_DisableDualMode(SPI_T *spi)
{
HAL_CLR_BIT(spi->BCC, SPI_BCC_DRM_MASK);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_SetInterval(SPI_T *spi, rt_uint16_t nSCLK)
{
HAL_MODIFY_REG(spi->WAIT, SPI_WAIT_WCC_MASK, nSCLK << SPI_WAIT_WCC_SHIFT);
}
/*
* @brief
*/
static void SPI_SetClkDiv(SPI_T *spi, rt_uint16_t div)
{
rt_uint8_t n = 0;
if (div < 1)
{
return;
}
if (div > 2 * (0xFF + 1))
{
HAL_CLR_BIT(spi->CCTR, SPI_CCTR_DRS_MASK);
do
{
div = (div == 1) ? 0 : ((div + 1) / 2);
n++;
}
while (div);
HAL_MODIFY_REG(spi->CCTR, SPI_CCTR_CDR1_MASK, (n & 0x0F) << SPI_CCTR_CDR1_SHIFT);
}
else
{
HAL_SET_BIT(spi->CCTR, SPI_CCTR_DRS_MASK);
n = ((div + 1) / 2) - 1;
HAL_MODIFY_REG(spi->CCTR, SPI_CCTR_CDR2_MASK, (n & 0xFF) << SPI_CCTR_CDR2_SHIFT);
}
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_SetDataSize(SPI_T *spi, rt_uint32_t data_size, rt_uint32_t dummy_size)
{
HAL_MODIFY_REG(spi->BC, SPI_BC_MBC_MASK, data_size + dummy_size);
HAL_MODIFY_REG(spi->TC, SPI_TC_MWTC_MASK, data_size);
HAL_MODIFY_REG(spi->BCC, SPI_BCC_STC_MASK, data_size);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_Write(SPI_T *spi, rt_uint8_t *data)
{
HAL_REG_8BIT(&spi->TXD) = *data;
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
void SPI_Read(SPI_T *spi, rt_uint8_t *data)
{
*data = HAL_REG_8BIT(&spi->RXD);
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
rt_uint8_t *SPI_TxAddress(SPI_T *spi)
{
return (rt_uint8_t *)&spi->TXD;
}
/*
* @brief
*/
__SPI_STATIC_INLINE__
rt_uint8_t *SPI_RxAddress(SPI_T *spi)
{
return (rt_uint8_t *)&spi->RXD;
}
/* 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 tina_spi_ops =
{
configure,
xfer
};
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 tina_spi_cs *tina_spi_cs = device->parent.user_data;
struct tina_spi *_spi_info = (struct tina_spi *)spi_bus->parent.user_data;
SPI_T *spi = _spi_info->spi;
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
RT_ASSERT(device != RT_NULL);
RT_ASSERT(configuration != RT_NULL);
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
LOG_D("spi address: %08X", (rt_uint32_t)spi);
SPI_Disable(spi);
SPI_Reset(spi);
SPI_ResetRxFifo(spi);
SPI_ResetTxFifo(spi);
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
/* data_width */
if (configuration->data_width != 8)
{
LOG_D("error: data_width is %d", configuration->data_width);
return RT_EIO;
}
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
SPI_SetDuplex(spi, SPI_TCTRL_DHB_FULL_DUPLEX);
SPI_SetMode(spi, SPI_CTRL_MODE_MASTER);
/* MSB or LSB */
if (configuration->mode & RT_SPI_MSB)
{
SPI_SetFirstTransmitBit(spi, SPI_TCTRL_FBS_MSB);
}
else
{
SPI_SetFirstTransmitBit(spi, SPI_TCTRL_FBS_LSB);
}
switch (configuration->mode & RT_SPI_MODE_3)
{
case RT_SPI_MODE_0:
SPI_SetSclkMode(spi, SPI_SCLK_Mode0);
break;
case RT_SPI_MODE_1:
SPI_SetSclkMode(spi, SPI_SCLK_Mode1);
break;
case RT_SPI_MODE_2:
SPI_SetSclkMode(spi, SPI_SCLK_Mode2);
break;
case RT_SPI_MODE_3:
SPI_SetSclkMode(spi, SPI_SCLK_Mode3);
break;
}
/* baudrate */
{
unsigned int spi_clock = 0;
rt_uint32_t max_hz;
rt_uint32_t div;
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
max_hz = configuration->max_hz;
if (max_hz > SPI_BUS_MAX_CLK)
{
max_hz = SPI_BUS_MAX_CLK;
}
spi_clock = ahb_get_clk();
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
div = (spi_clock + max_hz - 1) / max_hz;
LOG_D("configuration->max_hz: %d", configuration->max_hz);
LOG_D("max freq: %d", max_hz);
LOG_D("spi_clock: %d", spi_clock);
LOG_D("div: %d", div);
SPI_SetClkDiv(spi, div / 2);
} /* baudrate */
SPI_ManualChipSelect(spi, tina_spi_cs->cs);
SPI_SetDataSize(spi, 0, 0);
SPI_Enable(spi);
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
return RT_EOK;
};
static rt_uint32_t xfer(struct rt_spi_device *device, struct rt_spi_message *message)
{
struct rt_spi_bus *r6_spi_bus = (struct rt_spi_bus *)device->bus;
struct tina_spi *_spi_info = (struct tina_spi *)r6_spi_bus->parent.user_data;
SPI_T *spi = _spi_info->spi;
struct rt_spi_configuration *config = &device->config;
struct tina_spi_cs *tina_spi_cs = device->parent.user_data;
RT_ASSERT(device != NULL);
RT_ASSERT(message != NULL);
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
LOG_D("spi_info: %08X", (rt_uint32_t)_spi_info);
LOG_D("spi address: %08X", (rt_uint32_t)spi);
/* take CS */
if (message->cs_take)
{
SPI_ManualChipSelect(spi, tina_spi_cs->cs);
SPI_SetCsLevel(spi, false);
LOG_D("spi take cs");
}
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
{
if ((config->data_width <= 8) && (message->length > 0))
{
const rt_uint8_t *send_ptr = message->send_buf;
rt_uint8_t *recv_ptr = message->recv_buf;
rt_uint32_t tx_size = message->length;
rt_uint32_t rx_size = message->length;
LOG_D("spi poll transfer start: %d", tx_size);
SPI_ResetTxFifo(spi);
SPI_ResetRxFifo(spi);
SPI_SetDataSize(spi, tx_size, 0);
SPI_StartTransmit(spi);
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
while (tx_size > 0 || rx_size > 0)
{
rt_uint8_t tx_data = 0xFF;
rt_uint8_t rx_data = 0xFF;
while ((SPI_GetTxFifoCounter(spi) < SPI_FIFO_SIZE) && (tx_size > 0))
{
if (send_ptr != RT_NULL)
{
tx_data = *send_ptr++;
}
SPI_Write(spi, &tx_data);
tx_size--;
}
while (SPI_GetRxFifoCounter(spi) > 0)
{
rx_size--;
SPI_Read(spi, &rx_data);
if (recv_ptr != RT_NULL)
{
*recv_ptr++ = rx_data;
}
}
}
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
if ((tx_size != 0) || (rx_size != 0))
{
LOG_D("spi_tx_rx error with tx count = %d, rx count = %d.", tx_size, rx_size);
return 0;
}
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
while (SPI_IntState(spi, SPI_INT_TRANSFER_COMPLETE) == 0);
SPI_ClearInt(spi, SPI_INT_TRANSFER_COMPLETE);
LOG_D("spi poll transfer finsh");
}
else if (config->data_width > 8)
{
LOG_D("data width: %d", config->data_width);
RT_ASSERT(NULL);
}
}
/* release CS */
if (message->cs_release)
{
SPI_SetCsLevel(spi, true);
LOG_D("spi release cs");
}
return message->length;
};
#ifdef TINA_USING_SPI0
static struct rt_spi_bus spi_bus0;
#endif
#ifdef TINA_USING_SPI1
static struct rt_spi_bus spi_bus1;
#endif
static const struct tina_spi spis[] =
{
#ifdef TINA_USING_SPI0
{(SPI_T *)SPI0_BASE_ADDR, SPI0_GATING, &spi_bus0},
#endif
#ifdef TINA_USING_SPI1
{(SPI_T *)SPI1_BASE_ADDR, SPI1_GATING, &spi_bus1},
#endif
};
/** \brief init and register r6 spi bus.
*
* \param SPI: R6 SPI, e.g: SPI1,SPI2,SPI3.
* \param spi_bus_name: spi bus name, e.g: "spi1"
* \return
*
*/
rt_err_t tina_spi_bus_register(SPI_T *spi, const char *spi_bus_name)
{
int i;
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
RT_ASSERT(spi_bus_name != RT_NULL);
for (i = 0; i < ARR_LEN(spis); i++)
{
if (spi == spis[i].spi)
{
bus_software_reset_disalbe(spis[i].spi_gate);
bus_gate_clk_enalbe(spis[i].spi_gate);
spis[i].spi_bus->parent.user_data = (void *)&spis[i];
LOG_D("bus addr: %08X", (rt_uint32_t)spis[i].spi_bus);
LOG_D("user_data: %08X", (rt_uint32_t)spis[i].spi_bus->parent.user_data);
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
rt_spi_bus_register(spis[i].spi_bus, spi_bus_name, &tina_spi_ops);
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
return RT_EOK;
}
}
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
return RT_ERROR;
}
int rt_hw_spi_init(void)
{
LOG_D("register spi bus");
#ifdef TINA_USING_SPI0
/* register spi bus */
{
rt_err_t result;
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
gpio_set_func(GPIO_PORT_C, GPIO_PIN_0, IO_FUN_1);
gpio_set_func(GPIO_PORT_C, GPIO_PIN_2, IO_FUN_1);
gpio_set_func(GPIO_PORT_C, GPIO_PIN_3, IO_FUN_1);
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
result = tina_spi_bus_register((SPI_T *)SPI0_BASE_ADDR, "spi0");
if (result != RT_EOK)
{
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
return result;
}
}
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
/* attach cs */
{
static struct rt_spi_device spi_device;
static struct tina_spi_cs spi_cs;
rt_err_t result;
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
spi_cs.cs = SPI_TCTRL_SS_SEL_SS0;
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
gpio_set_func(GPIO_PORT_C, GPIO_PIN_1, IO_FUN_1);
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
result = rt_spi_bus_attach_device(&spi_device, "spi00", "spi0", (void *)&spi_cs);
if (result != RT_EOK)
{
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
return result;
}
}
LOG_D("%s -> %d", __FUNCTION__, __LINE__);
#endif
#ifdef TINA_USING_SPI1
/* register spi bus */
{
rt_err_t result;
gpio_set_func(GPIO_PORT_A, GPIO_PIN_1, IO_FUN_5);
gpio_set_func(GPIO_PORT_A, GPIO_PIN_2, IO_FUN_5);
gpio_set_func(GPIO_PORT_A, GPIO_PIN_3, IO_FUN_5);
result = tina_spi_bus_register((SPI_T *)SPI1_BASE_ADDR, "spi1");
if (result != RT_EOK)
{
LOG_D("register spi bus faild: %d", result);
return result;
}
}
LOG_D("attach cs");
/* attach cs */
{
static struct rt_spi_device spi_device;
static struct tina_spi_cs spi_cs;
rt_err_t result;
spi_cs.cs = SPI_TCTRL_SS_SEL_SS0;
gpio_set_func(GPIO_PORT_A, GPIO_PIN_0, IO_FUN_5);
result = rt_spi_bus_attach_device(&spi_device, "spi10", "spi1", (void *)&spi_cs);
if (result != RT_EOK)
{
LOG_D("attach cs faild: %d", result);
return result;
}
}
#endif
return RT_EOK;
}
INIT_BOARD_EXPORT(rt_hw_spi_init);
#endif
View Git Blame Copy Permalink