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stm_spi_api.c
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/* mbed Microcontroller Library
*******************************************************************************
* Copyright (c) 2015, STMicroelectronics
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of STMicroelectronics nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*******************************************************************************
*/
#include "mbed_assert.h"
#include "mbed_error.h"
#include "mbed_debug.h"
#include "mbed_critical.h"
#include "mbed_wait_api.h"
#include "spi_api.h"
#if DEVICE_SPI
#include <stdbool.h>
#include <math.h>
#include <string.h>
#include "cmsis.h"
#include "pinmap.h"
#include "PeripheralPins.h"
#include "spi_device.h"
#if DEVICE_SPI_ASYNCH
#define SPI_INST(obj) ((SPI_TypeDef *)(obj->spi.spi))
#else
#define SPI_INST(obj) ((SPI_TypeDef *)(obj->spi))
#endif
#if DEVICE_SPI_ASYNCH
#define SPI_S(obj) (( struct spi_s *)(&(obj->spi)))
#else
#define SPI_S(obj) (( struct spi_s *)(obj))
#endif
#ifndef DEBUG_STDIO
# define DEBUG_STDIO 0
#endif
#if DEBUG_STDIO
# include <stdio.h>
# define DEBUG_PRINTF(...) do { printf(__VA_ARGS__); } while(0)
#else
# define DEBUG_PRINTF(...) {}
#endif
/* Consider 10ms as the default timeout for sending/receving 1 byte */
#define TIMEOUT_1_BYTE 10
#if defined(SPI_FLAG_FRLVL) // STM32F0 STM32F3 STM32F7 STM32L4
#if defined(STM32U5)
extern HAL_StatusTypeDef HAL_SPIEx_FlushRxFifo(const SPI_HandleTypeDef *hspi);
#else
extern HAL_StatusTypeDef HAL_SPIEx_FlushRxFifo(SPI_HandleTypeDef *hspi);
#endif
#endif
#if defined(SPI_DATASIZE_17BIT) || defined(SPI_DATASIZE_18BIT) || defined(SPI_DATASIZE_19BIT) || defined(SPI_DATASIZE_20BIT) || \
defined(SPI_DATASIZE_21BIT) || defined(SPI_DATASIZE_22BIT) || defined(SPI_DATASIZE_23BIT) || defined(SPI_DATASIZE_24BIT) || \
defined(SPI_DATASIZE_25BIT) || defined(SPI_DATASIZE_26BIT) || defined(SPI_DATASIZE_27BIT) || defined(SPI_DATASIZE_28BIT) || \
defined(SPI_DATASIZE_29BIT) || defined(SPI_DATASIZE_30BIT) || defined(SPI_DATASIZE_31BIT) || defined(SPI_DATASIZE_32BIT)
#define HAS_32BIT_SPI_TRANSFERS 1
#endif // SPI_DATASIZE_X
/**
* Flush RX FIFO/input register of SPI interface and clear overrun flag.
*/
static inline void spi_flush_rx(spi_t *obj)
{
#if defined(SPI_FLAG_FRLVL)
HAL_SPIEx_FlushRxFifo(&(SPI_S(obj)->handle));
#endif
LL_SPI_ClearFlag_OVR(SPI_INST(obj));
}
void spi_get_capabilities(PinName ssel, bool slave, spi_capabilities_t *cap)
{
if (slave) {
cap->minimum_frequency = 200000; // 200 kHz
cap->maximum_frequency = 2000000; // 2 MHz
cap->word_length = 0x00008080; // 8 and 16 bit symbols
cap->support_slave_mode = false; // to be determined later based on ssel
cap->hw_cs_handle = false; // irrelevant in slave mode
cap->slave_delay_between_symbols_ns = 2500; // 2.5 us
cap->clk_modes = 0x0f; // all clock modes
cap->tx_rx_buffers_equal_length = false; // rx/tx buffers can have different sizes
#if DEVICE_SPI_ASYNCH
cap->async_mode = true;
#else
cap->async_mode = false;
#endif
} else {
cap->minimum_frequency = 200000; // 200 kHz
cap->maximum_frequency = 2000000; // 2 MHz
cap->word_length = STM32_SPI_CAPABILITY_WORD_LENGTH; // Defined in spi_device.h
cap->support_slave_mode = false; // to be determined later based on ssel
cap->hw_cs_handle = false; // to be determined later based on ssel
cap->slave_delay_between_symbols_ns = 0; // irrelevant in master mode
cap->clk_modes = 0x0f; // all clock modes
cap->tx_rx_buffers_equal_length = false; // rx/tx buffers can have different sizes
#if DEVICE_SPI_ASYNCH
cap->async_mode = true;
#else
cap->async_mode = false;
#endif
}
// check if given ssel pin is in the cs pinmap
const PinMap *cs_pins = spi_master_cs_pinmap();
while (cs_pins->pin != NC) {
if (cs_pins->pin == ssel) {
#if DEVICE_SPISLAVE
cap->support_slave_mode = true;
#endif
cap->hw_cs_handle = true;
break;
}
cs_pins++;
}
}
void init_spi(spi_t *obj)
{
struct spi_s *spiobj = SPI_S(obj);
SPI_HandleTypeDef *handle = &(spiobj->handle);
__HAL_SPI_DISABLE(handle);
DEBUG_PRINTF("init_spi: instance=0x%8X\r\n", (int)handle->Instance);
if (HAL_SPI_Init(handle) != HAL_OK) {
error("Cannot initialize SPI");
}
/* In some cases after SPI object re-creation SPI overrun flag may not
* be cleared, so clear RX data explicitly to prevent any transmissions errors */
spi_flush_rx(obj);
/* In case of standard 4 wires SPI,PI can be kept enabled all time
* and SCK will only be generated during the write operations. But in case
* of 3 wires, it should be only enabled during rd/wr unitary operations,
* which is handled inside STM32 HAL layer.
*/
if (handle->Init.Direction == SPI_DIRECTION_2LINES) {
__HAL_SPI_ENABLE(handle);
}
}
SPIName spi_get_peripheral_name(PinName mosi, PinName miso, PinName sclk)
{
SPIName spi_mosi = (SPIName)pinmap_peripheral(mosi, PinMap_SPI_MOSI);
SPIName spi_miso = (SPIName)pinmap_peripheral(miso, PinMap_SPI_MISO);
SPIName spi_sclk = (SPIName)pinmap_peripheral(sclk, PinMap_SPI_SCLK);
SPIName spi_per;
// MISO or MOSI may be not connected
if (miso == NC) {
spi_per = (SPIName)pinmap_merge(spi_mosi, spi_sclk);
} else if (mosi == NC) {
spi_per = (SPIName)pinmap_merge(spi_miso, spi_sclk);
} else {
SPIName spi_data = (SPIName)pinmap_merge(spi_mosi, spi_miso);
spi_per = (SPIName)pinmap_merge(spi_data, spi_sclk);
}
return spi_per;
}
#if STATIC_PINMAP_READY
#define SPI_INIT_DIRECT spi_init_direct
void spi_init_direct(spi_t *obj, const spi_pinmap_t *pinmap)
#else
#define SPI_INIT_DIRECT _spi_init_direct
static void _spi_init_direct(spi_t *obj, const spi_pinmap_t *pinmap)
#endif
{
struct spi_s *spiobj = SPI_S(obj);
SPI_HandleTypeDef *handle = &(spiobj->handle);
spiobj->spi = (SPIName)pinmap->peripheral;
MBED_ASSERT(spiobj->spi != (SPIName)NC);
#if defined(SPI_IP_VERSION_V2)
RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
#endif /* SPI_IP_VERSION_V2 */
#if defined SPI1_BASE
// Enable SPI clock
if (spiobj->spi == SPI_1) {
#if defined(SPI_IP_VERSION_V2)
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_SPI1;
#if defined (RCC_SPI123CLKSOURCE_PLL)
PeriphClkInit.Spi123ClockSelection = RCC_SPI123CLKSOURCE_PLL;
#else
PeriphClkInit.Spi1ClockSelection = RCC_SPI1CLKSOURCE_SYSCLK;
#endif
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK) {
error("HAL_RCCEx_PeriphCLKConfig\n");
}
#endif /* SPI_IP_VERSION_V2 */
__HAL_RCC_SPI1_FORCE_RESET();
__HAL_RCC_SPI1_RELEASE_RESET();
__HAL_RCC_SPI1_CLK_ENABLE();
spiobj->spiIRQ = SPI1_IRQn;
}
#endif
#if defined SPI2_BASE
if (spiobj->spi == SPI_2) {
#if defined(SPI_IP_VERSION_V2)
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_SPI2;
#if defined (RCC_SPI123CLKSOURCE_PLL)
PeriphClkInit.Spi123ClockSelection = RCC_SPI123CLKSOURCE_PLL;
#else
PeriphClkInit.Spi2ClockSelection = RCC_SPI2CLKSOURCE_SYSCLK;
#endif
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK) {
error("HAL_RCCEx_PeriphCLKConfig\n");
}
#endif /* SPI_IP_VERSION_V2 */
__HAL_RCC_SPI2_FORCE_RESET();
__HAL_RCC_SPI2_RELEASE_RESET();
__HAL_RCC_SPI2_CLK_ENABLE();
spiobj->spiIRQ = SPI2_IRQn;
}
#endif
#if defined SPI3_BASE
if (spiobj->spi == SPI_3) {
#if defined(SPI_IP_VERSION_V2)
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_SPI3;
#if defined (RCC_SPI123CLKSOURCE_PLL)
PeriphClkInit.Spi123ClockSelection = RCC_SPI123CLKSOURCE_PLL;
#else
PeriphClkInit.Spi3ClockSelection = RCC_SPI3CLKSOURCE_SYSCLK;
#endif
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK) {
error("HAL_RCCEx_PeriphCLKConfig\n");
}
#endif /* SPI_IP_VERSION_V2 */
__HAL_RCC_SPI3_FORCE_RESET();
__HAL_RCC_SPI3_RELEASE_RESET();
__HAL_RCC_SPI3_CLK_ENABLE();
spiobj->spiIRQ = SPI3_IRQn;
}
#endif
#if defined SPI4_BASE
if (spiobj->spi == SPI_4) {
#if defined(SPI_IP_VERSION_V2)
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_SPI4;
PeriphClkInit.Spi45ClockSelection = RCC_SPI45CLKSOURCE_PCLK1;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK) {
error("HAL_RCCEx_PeriphCLKConfig\n");
}
#endif /* SPI_IP_VERSION_V2 */
__HAL_RCC_SPI4_FORCE_RESET();
__HAL_RCC_SPI4_RELEASE_RESET();
__HAL_RCC_SPI4_CLK_ENABLE();
spiobj->spiIRQ = SPI4_IRQn;
}
#endif
#if defined SPI5_BASE
if (spiobj->spi == SPI_5) {
#if defined(SPI_IP_VERSION_V2)
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_SPI5;
PeriphClkInit.Spi45ClockSelection = RCC_SPI45CLKSOURCE_PCLK1;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK) {
error("HAL_RCCEx_PeriphCLKConfig\n");
}
#endif /* SPI_IP_VERSION_V2 */
__HAL_RCC_SPI5_FORCE_RESET();
__HAL_RCC_SPI5_RELEASE_RESET();
__HAL_RCC_SPI5_CLK_ENABLE();
spiobj->spiIRQ = SPI5_IRQn;
}
#endif
#if defined SPI6_BASE
if (spiobj->spi == SPI_6) {
#if defined(SPI_IP_VERSION_V2)
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_SPI6;
PeriphClkInit.Spi6ClockSelection = RCC_SPI6CLKSOURCE_PCLK4;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK) {
error("HAL_RCCEx_PeriphCLKConfig\n");
}
#endif /* SPI_IP_VERSION_V2 */
__HAL_RCC_SPI6_FORCE_RESET();
__HAL_RCC_SPI6_RELEASE_RESET();
__HAL_RCC_SPI6_CLK_ENABLE();
spiobj->spiIRQ = SPI6_IRQn;
}
#endif
// Configure the SPI pins
pin_function(pinmap->mosi_pin, pinmap->mosi_function);
pin_mode(pinmap->mosi_pin, PullDown); // Pull Down is set for output line
pin_function(pinmap->miso_pin, pinmap->miso_function);
pin_mode(pinmap->miso_pin, PullNone);
pin_function(pinmap->sclk_pin, pinmap->sclk_function);
pin_mode(pinmap->sclk_pin, PullNone);
spiobj->pin_miso = pinmap->miso_pin;
spiobj->pin_mosi = pinmap->mosi_pin;
spiobj->pin_sclk = pinmap->sclk_pin;
spiobj->pin_ssel = pinmap->ssel_pin;
if (pinmap->ssel_pin != NC) {
pin_function(pinmap->ssel_pin, pinmap->ssel_function);
pin_mode(pinmap->ssel_pin, PullNone);
handle->Init.NSS = SPI_NSS_HARD_OUTPUT;
#if defined(SPI_NSS_PULSE_ENABLE)
handle->Init.NSSPMode = SPI_NSS_PULSE_ENABLE;
#endif
} else {
handle->Init.NSS = SPI_NSS_SOFT;
#if defined(SPI_NSS_PULSE_DISABLE)
handle->Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
#endif
}
/* Fill default value */
handle->Instance = SPI_INST(obj);
handle->Init.Mode = SPI_MODE_MASTER;
handle->Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256;
if (pinmap->miso_pin != NC) {
handle->Init.Direction = SPI_DIRECTION_2LINES;
} else {
handle->Init.Direction = SPI_DIRECTION_1LINE;
}
handle->Init.CLKPhase = SPI_PHASE_1EDGE;
handle->Init.CLKPolarity = SPI_POLARITY_LOW;
handle->Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
handle->Init.CRCPolynomial = 7;
#if defined(SPI_CRC_LENGTH_DATASIZE)
handle->Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;
#endif
handle->Init.DataSize = SPI_DATASIZE_8BIT;
handle->Init.FirstBit = SPI_FIRSTBIT_MSB;
handle->Init.TIMode = SPI_TIMODE_DISABLE;
#if defined (SPI_IP_VERSION_V2)
handle->Init.NSSPolarity = SPI_NSS_POLARITY_LOW;
handle->Init.MasterKeepIOState = SPI_MASTER_KEEP_IO_STATE_ENABLE;
handle->Init.FifoThreshold = SPI_FIFO_THRESHOLD_01DATA;
handle->Init.TxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
handle->Init.RxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
handle->Init.MasterSSIdleness = SPI_MASTER_SS_IDLENESS_00CYCLE;
handle->Init.MasterInterDataIdleness = SPI_MASTER_INTERDATA_IDLENESS_00CYCLE;
handle->Init.MasterReceiverAutoSusp = SPI_MASTER_RX_AUTOSUSP_DISABLE;
handle->Init.IOSwap = SPI_IO_SWAP_DISABLE;
#if defined(SPI_RDY_MASTER_MANAGEMENT_INTERNALLY)
handle->Init.ReadyMasterManagement = SPI_RDY_MASTER_MANAGEMENT_INTERNALLY;
handle->Init.ReadyPolarity = SPI_RDY_POLARITY_HIGH;
#endif
#endif /* SPI_IP_VERSION_V2 */
/*
* According the STM32 Datasheet for SPI peripheral we need to PULLDOWN
* or PULLUP the SCK pin according the polarity used.
*/
pin_mode(spiobj->pin_sclk, (handle->Init.CLKPolarity == SPI_POLARITY_LOW) ? PullDown : PullUp);
init_spi(obj);
}
void spi_init(spi_t *obj, PinName mosi, PinName miso, PinName sclk, PinName ssel)
{
// determine the SPI to use
uint32_t spi_mosi = pinmap_peripheral(mosi, PinMap_SPI_MOSI);
uint32_t spi_miso = pinmap_peripheral(miso, PinMap_SPI_MISO);
uint32_t spi_sclk = pinmap_peripheral(sclk, PinMap_SPI_SCLK);
uint32_t spi_ssel = pinmap_peripheral(ssel, PinMap_SPI_SSEL);
uint32_t spi_data = pinmap_merge(spi_mosi, spi_miso);
uint32_t spi_cntl = pinmap_merge(spi_sclk, spi_ssel);
int peripheral = (int)pinmap_merge(spi_data, spi_cntl);
// pin out the spi pins
int mosi_function = (int)pinmap_find_function(mosi, PinMap_SPI_MOSI);
int miso_function = (int)pinmap_find_function(miso, PinMap_SPI_MISO);
int sclk_function = (int)pinmap_find_function(sclk, PinMap_SPI_SCLK);
int ssel_function = (int)pinmap_find_function(ssel, PinMap_SPI_SSEL);
const spi_pinmap_t explicit_spi_pinmap = {peripheral, mosi, mosi_function, miso, miso_function, sclk, sclk_function, ssel, ssel_function};
SPI_INIT_DIRECT(obj, &explicit_spi_pinmap);
}
void spi_free(spi_t *obj)
{
struct spi_s *spiobj = SPI_S(obj);
SPI_HandleTypeDef *handle = &(spiobj->handle);
DEBUG_PRINTF("spi_free\r\n");
__HAL_SPI_DISABLE(handle);
HAL_SPI_DeInit(handle);
#if defined(DUAL_CORE) && (TARGET_STM32H7)
while (LL_HSEM_1StepLock(HSEM, CFG_HW_RCC_SEMID)) {
}
#endif /* DUAL_CORE */
#if defined SPI1_BASE
// Reset SPI and disable clock
if (spiobj->spi == SPI_1) {
__HAL_RCC_SPI1_FORCE_RESET();
__HAL_RCC_SPI1_RELEASE_RESET();
__HAL_RCC_SPI1_CLK_DISABLE();
}
#endif
#if defined SPI2_BASE
if (spiobj->spi == SPI_2) {
__HAL_RCC_SPI2_FORCE_RESET();
__HAL_RCC_SPI2_RELEASE_RESET();
__HAL_RCC_SPI2_CLK_DISABLE();
}
#endif
#if defined SPI3_BASE
if (spiobj->spi == SPI_3) {
__HAL_RCC_SPI3_FORCE_RESET();
__HAL_RCC_SPI3_RELEASE_RESET();
__HAL_RCC_SPI3_CLK_DISABLE();
}
#endif
#if defined SPI4_BASE
if (spiobj->spi == SPI_4) {
__HAL_RCC_SPI4_FORCE_RESET();
__HAL_RCC_SPI4_RELEASE_RESET();
__HAL_RCC_SPI4_CLK_DISABLE();
}
#endif
#if defined SPI5_BASE
if (spiobj->spi == SPI_5) {
__HAL_RCC_SPI5_FORCE_RESET();
__HAL_RCC_SPI5_RELEASE_RESET();
__HAL_RCC_SPI5_CLK_DISABLE();
}
#endif
#if defined SPI6_BASE
if (spiobj->spi == SPI_6) {
__HAL_RCC_SPI6_FORCE_RESET();
__HAL_RCC_SPI6_RELEASE_RESET();
__HAL_RCC_SPI6_CLK_DISABLE();
}
#endif
#if defined(DUAL_CORE) && (TARGET_STM32H7)
LL_HSEM_ReleaseLock(HSEM, CFG_HW_RCC_SEMID, HSEM_CR_COREID_CURRENT);
#endif /* DUAL_CORE */
// Configure GPIOs back to reset value
pin_function(spiobj->pin_miso, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0));
pin_function(spiobj->pin_mosi, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0));
pin_function(spiobj->pin_sclk, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0));
if (handle->Init.NSS != SPI_NSS_SOFT) {
pin_function(spiobj->pin_ssel, STM_PIN_DATA(STM_MODE_ANALOG, GPIO_NOPULL, 0));
}
}
void spi_format(spi_t *obj, int bits, int mode, int slave)
{
struct spi_s *spiobj = SPI_S(obj);
SPI_HandleTypeDef *handle = &(spiobj->handle);
PinMode pull = PullNone;
DEBUG_PRINTF("spi_format, bits:%d, mode:%d, slave?:%d\r\n", bits, mode, slave);
// Save new values
uint32_t DataSize;
switch (bits) {
#if defined(SPI_DATASIZE_4BIT)
case 4:
DataSize = SPI_DATASIZE_4BIT;
break;
#endif
#if defined(SPI_DATASIZE_5BIT)
case 5:
DataSize = SPI_DATASIZE_5BIT;
break;
#endif
#if defined(SPI_DATASIZE_6BIT)
case 6:
DataSize = SPI_DATASIZE_6BIT;
break;
#endif
#if defined(SPI_DATASIZE_7BIT)
case 7:
DataSize = SPI_DATASIZE_7BIT;
break;
#endif
#if defined(SPI_DATASIZE_9BIT)
case 9:
DataSize = SPI_DATASIZE_9BIT;
break;
#endif
#if defined(SPI_DATASIZE_10BIT)
case 10:
DataSize = SPI_DATASIZE_10BIT;
break;
#endif
#if defined(SPI_DATASIZE_11BIT)
case 11:
DataSize = SPI_DATASIZE_11BIT;
break;
#endif
#if defined(SPI_DATASIZE_12BIT)
case 12:
DataSize = SPI_DATASIZE_12BIT;
break;
#endif
#if defined(SPI_DATASIZE_13BIT)
case 13:
DataSize = SPI_DATASIZE_13BIT;
break;
#endif
#if defined(SPI_DATASIZE_14BIT)
case 14:
DataSize = SPI_DATASIZE_14BIT;
break;
#endif
#if defined(SPI_DATASIZE_15BIT)
case 15:
DataSize = SPI_DATASIZE_15BIT;
break;
#endif
#if defined(SPI_DATASIZE_17BIT)
case 17:
DataSize = SPI_DATASIZE_17BIT;
break;
#endif
#if defined(SPI_DATASIZE_18BIT)
case 18:
DataSize = SPI_DATASIZE_18BIT;
break;
#endif
#if defined(SPI_DATASIZE_19BIT)
case 19:
DataSize = SPI_DATASIZE_19BIT;
break;
#endif
#if defined(SPI_DATASIZE_20BIT)
case 20:
DataSize = SPI_DATASIZE_20BIT;
break;
#endif
#if defined(SPI_DATASIZE_21BIT)
case 21:
DataSize = SPI_DATASIZE_21BIT;
break;
#endif
#if defined(SPI_DATASIZE_22BIT)
case 22:
DataSize = SPI_DATASIZE_22BIT;
break;
#endif
#if defined(SPI_DATASIZE_23BIT)
case 23:
DataSize = SPI_DATASIZE_23BIT;
break;
#endif
#if defined(SPI_DATASIZE_24BIT)
case 24:
DataSize = SPI_DATASIZE_24BIT;
break;
#endif
#if defined(SPI_DATASIZE_25BIT)
case 25:
DataSize = SPI_DATASIZE_25BIT;
break;
#endif
#if defined(SPI_DATASIZE_26BIT)
case 26:
DataSize = SPI_DATASIZE_26BIT;
break;
#endif
#if defined(SPI_DATASIZE_27BIT)
case 27:
DataSize = SPI_DATASIZE_27BIT;
break;
#endif
#if defined(SPI_DATASIZE_28BIT)
case 28:
DataSize = SPI_DATASIZE_28BIT;
break;
#endif
#if defined(SPI_DATASIZE_29BIT)
case 29:
DataSize = SPI_DATASIZE_29BIT;
break;
#endif
#if defined(SPI_DATASIZE_30BIT)
case 30:
DataSize = SPI_DATASIZE_30BIT;
break;
#endif
#if defined(SPI_DATASIZE_31BIT)
case 31:
DataSize = SPI_DATASIZE_31BIT;
break;
#endif
#if defined(SPI_DATASIZE_32BIT)
case 32:
DataSize = SPI_DATASIZE_32BIT;
break;
#endif
case 16:
DataSize = SPI_DATASIZE_16BIT;
break;
// 8 bits is the default for anything not found before
default:
DataSize = SPI_DATASIZE_8BIT;
break;
}
handle->Init.DataSize = DataSize;
switch (mode) {
case 0:
handle->Init.CLKPolarity = SPI_POLARITY_LOW;
handle->Init.CLKPhase = SPI_PHASE_1EDGE;
break;
case 1:
handle->Init.CLKPolarity = SPI_POLARITY_LOW;
handle->Init.CLKPhase = SPI_PHASE_2EDGE;
break;
case 2:
handle->Init.CLKPolarity = SPI_POLARITY_HIGH;
handle->Init.CLKPhase = SPI_PHASE_1EDGE;
break;
default:
handle->Init.CLKPolarity = SPI_POLARITY_HIGH;
handle->Init.CLKPhase = SPI_PHASE_2EDGE;
break;
}
if (handle->Init.NSS != SPI_NSS_SOFT) {
handle->Init.NSS = (slave) ? SPI_NSS_HARD_INPUT : SPI_NSS_HARD_OUTPUT;
}
if (slave) {
handle->Init.Mode = SPI_MODE_SLAVE;
if (handle->Init.Direction == SPI_DIRECTION_1LINE) {
/* SPI slave implemtation in MBED does not support the 3 wires SPI.
* (e.g. when MISO is not connected). So we're forcing slave in
* 2LINES mode. As MISO is not connected, slave will only read
* from master, and cannot write to it. Inform user.
*/
debug("3 wires SPI slave not supported - slave will only read\r\n");
handle->Init.Direction = SPI_DIRECTION_2LINES;
}
pin_mode(spiobj->pin_mosi, PullNone);
pin_mode(spiobj->pin_miso, PullDown); // Pull Down is set for output line
}
/*
* According the STM32 Datasheet for SPI peripheral we need to PULLDOWN
* or PULLUP the SCK pin according the polarity used.
*/
pull = (handle->Init.CLKPolarity == SPI_POLARITY_LOW) ? PullDown : PullUp;
pin_mode(spiobj->pin_sclk, pull);
init_spi(obj);
}
/*
* Only the IP clock input is family dependant so it computed
* separately in spi_get_clock_freq
*/
extern int spi_get_clock_freq(spi_t *obj);
static const uint32_t baudrate_prescaler_table[] = {SPI_BAUDRATEPRESCALER_2,
SPI_BAUDRATEPRESCALER_4,
SPI_BAUDRATEPRESCALER_8,
SPI_BAUDRATEPRESCALER_16,
SPI_BAUDRATEPRESCALER_32,
SPI_BAUDRATEPRESCALER_64,
SPI_BAUDRATEPRESCALER_128,
SPI_BAUDRATEPRESCALER_256
};
/**
* Convert SPI_BAUDRATEPRESCALER_<X> constant into numeric prescaler rank.
*/
static uint8_t spi_get_baudrate_prescaler_rank(uint32_t value)
{
switch (value) {
case SPI_BAUDRATEPRESCALER_2:
return 0;
case SPI_BAUDRATEPRESCALER_4:
return 1;
case SPI_BAUDRATEPRESCALER_8:
return 2;
case SPI_BAUDRATEPRESCALER_16:
return 3;
case SPI_BAUDRATEPRESCALER_32:
return 4;
case SPI_BAUDRATEPRESCALER_64:
return 5;
case SPI_BAUDRATEPRESCALER_128:
return 6;
case SPI_BAUDRATEPRESCALER_256:
return 7;
default:
return 0xFF;
}
}
/**
* Get actual SPI baudrate.
*
* It may differ from a value that is passed to the ::spi_frequency function.
*/
int spi_get_baudrate(spi_t *obj)
{
struct spi_s *spiobj = SPI_S(obj);
SPI_HandleTypeDef *handle = &(spiobj->handle);
int freq = spi_get_clock_freq(obj);
uint8_t baudrate_rank = spi_get_baudrate_prescaler_rank(handle->Init.BaudRatePrescaler);
MBED_ASSERT(baudrate_rank != 0xFF);
return freq >> (baudrate_rank + 1);
}
void spi_frequency(spi_t *obj, int hz)
{
struct spi_s *spiobj = SPI_S(obj);
int spi_hz = 0;
uint8_t prescaler_rank = 0;
uint8_t last_index = (sizeof(baudrate_prescaler_table) / sizeof(baudrate_prescaler_table[0])) - 1;
SPI_HandleTypeDef *handle = &(spiobj->handle);
/* Calculate the spi clock for prescaler_rank 0: SPI_BAUDRATEPRESCALER_2 */
spi_hz = spi_get_clock_freq(obj) / 2;
/* Define pre-scaler in order to get highest available frequency below requested frequency */
while ((spi_hz > hz) && (prescaler_rank < last_index)) {
spi_hz = spi_hz / 2;
prescaler_rank++;
}
/* Use the best fit pre-scaler */
handle->Init.BaudRatePrescaler = baudrate_prescaler_table[prescaler_rank];
/* In case maximum pre-scaler still gives too high freq, raise an error */
if (spi_hz > hz) {
DEBUG_PRINTF("WARNING: lowest SPI freq (%d) higher than requested (%d)\r\n", spi_hz, hz);
}
DEBUG_PRINTF("spi_frequency, request:%d, select:%d\r\n", hz, spi_hz);
init_spi(obj);
}
static inline int ssp_readable(spi_t *obj)
{
int status;
struct spi_s *spiobj = SPI_S(obj);
SPI_HandleTypeDef *handle = &(spiobj->handle);
// Check if data is received
#if defined(SPI_IP_VERSION_V2)
status = ((__HAL_SPI_GET_FLAG(handle, SPI_FLAG_RXP) != RESET) ? 1 : 0);
#else /* SPI_IP_VERSION_V2 */
status = ((__HAL_SPI_GET_FLAG(handle, SPI_FLAG_RXNE) != RESET) ? 1 : 0);
#endif /* SPI_IP_VERSION_V2 */
return status;
}
static inline int ssp_writeable(spi_t *obj)
{
int status;
struct spi_s *spiobj = SPI_S(obj);
SPI_HandleTypeDef *handle = &(spiobj->handle);
// Check if data is transmitted
#if defined(SPI_IP_VERSION_V2)
status = ((__HAL_SPI_GET_FLAG(handle, SPI_FLAG_TXP) != RESET) ? 1 : 0);
#else /* SPI_IP_VERSION_V2 */
status = ((__HAL_SPI_GET_FLAG(handle, SPI_FLAG_TXE) != RESET) ? 1 : 0);
#endif /* SPI_IP_VERSION_V2 */
return status;
}
static inline int ssp_busy(spi_t *obj)
{
int status;
struct spi_s *spiobj = SPI_S(obj);
SPI_HandleTypeDef *handle = &(spiobj->handle);
#if defined(SPI_IP_VERSION_V2)
status = ((__HAL_SPI_GET_FLAG(handle, SPI_FLAG_RXWNE) != RESET) ? 1 : 0);
#else /* SPI_IP_VERSION_V2 */
status = ((__HAL_SPI_GET_FLAG(handle, SPI_FLAG_BSY) != RESET) ? 1 : 0);
#endif /* SPI_IP_VERSION_V2 */
return status;
}
static inline int datasize_to_transfer_bitshift(uint32_t DataSize)
{
switch (DataSize) {
#if defined(SPI_DATASIZE_4BIT)
case SPI_DATASIZE_4BIT:
#endif
#if defined(SPI_DATASIZE_5BIT)
case SPI_DATASIZE_5BIT:
#endif
#if defined(SPI_DATASIZE_6BIT)
case SPI_DATASIZE_6BIT:
#endif
#if defined(SPI_DATASIZE_7BIT)
case SPI_DATASIZE_7BIT:
#endif
case SPI_DATASIZE_8BIT:
return 0;
#if defined(SPI_DATASIZE_9BIT)
case SPI_DATASIZE_9BIT:
#endif
#if defined(SPI_DATASIZE_10BIT)
case SPI_DATASIZE_10BIT:
#endif
#if defined(SPI_DATASIZE_11BIT)
case SPI_DATASIZE_11BIT:
#endif
#if defined(SPI_DATASIZE_12BIT)
case SPI_DATASIZE_12BIT:
#endif
#if defined(SPI_DATASIZE_13BIT)
case SPI_DATASIZE_13BIT:
#endif
#if defined(SPI_DATASIZE_14BIT)
case SPI_DATASIZE_14BIT:
#endif
#if defined(SPI_DATASIZE_15BIT)
case SPI_DATASIZE_15BIT:
#endif
case SPI_DATASIZE_16BIT:
return 1;
#if defined(SPI_DATASIZE_17BIT)
case SPI_DATASIZE_17BIT:
return 2;
#endif
#if defined(SPI_DATASIZE_18BIT)
case SPI_DATASIZE_18BIT:
return 2;
#endif
#if defined(SPI_DATASIZE_19BIT)
case SPI_DATASIZE_19BIT:
return 2;
#endif
#if defined(SPI_DATASIZE_20BIT)
case SPI_DATASIZE_20BIT:
return 2;
#endif
#if defined(SPI_DATASIZE_21BIT)
case SPI_DATASIZE_21BIT:
return 2;
#endif
#if defined(SPI_DATASIZE_22BIT)
case SPI_DATASIZE_22BIT:
return 2;
#endif
#if defined(SPI_DATASIZE_23BIT)
case SPI_DATASIZE_23BIT:
return 2;
#endif
#if defined(SPI_DATASIZE_24BIT)
case SPI_DATASIZE_24BIT:
return 2;
#endif
#if defined(SPI_DATASIZE_25BIT)
case SPI_DATASIZE_25BIT:
return 2;
#endif
#if defined(SPI_DATASIZE_26BIT)
case SPI_DATASIZE_26BIT:
return 2;
#endif
#if defined(SPI_DATASIZE_27BIT)
case SPI_DATASIZE_27BIT:
return 2;
#endif
#if defined(SPI_DATASIZE_28BIT)
case SPI_DATASIZE_28BIT:
return 2;
#endif
#if defined(SPI_DATASIZE_29BIT)
case SPI_DATASIZE_29BIT:
return 2;
#endif
#if defined(SPI_DATASIZE_30BIT)
case SPI_DATASIZE_30BIT:
return 2;
#endif
#if defined(SPI_DATASIZE_31BIT)
case SPI_DATASIZE_31BIT:
return 2;
#endif
#if defined(SPI_DATASIZE_32BIT)
case SPI_DATASIZE_32BIT:
return 2;
#endif
// This point should never be reached, so return a negative value for assertion checking
default:
return -1;
}
}
static inline int spi_get_word_from_buffer(const void *buffer, int bitshift)
{
if (bitshift == 1) {
return *((uint16_t *)buffer);
#ifdef HAS_32BIT_SPI_TRANSFERS
} else if (bitshift == 2) {
return *((uint32_t *)buffer);
#endif /* HAS_32BIT_SPI_TRANSFERS */
} else {
return *((uint8_t *)buffer);
}
}
static inline void spi_put_word_to_buffer(void *buffer, int bitshift, int data)
{
if (bitshift == 1) {
*((uint16_t *)buffer) = data;
#ifdef HAS_32BIT_SPI_TRANSFERS
} else if (bitshift == 2) {
*((uint32_t *)buffer) = data;
#endif /* HAS_32BIT_SPI_TRANSFERS */
} else {
*((uint8_t *)buffer) = data;
}
}
/**
* Check if SPI master interface is writable.
*
* @param obj
* @return 0 - SPI isn't writable, non-zero - SPI is writable
*/
static inline int msp_writable(spi_t *obj)
{
#if defined(SPI_IP_VERSION_V2)
return (int)LL_SPI_IsActiveFlag_TXP(SPI_INST(obj));
#else /* SPI_IP_VERSION_V2 */
return (int)LL_SPI_IsActiveFlag_TXE(SPI_INST(obj));
#endif /* SPI_IP_VERSION_V2 */
}
/**
* Check if SPI master interface is readable.
*
* @param obj
* @return 0 - SPI isn't readable, non-zero - SPI is readable
*/
static inline int msp_readable(spi_t *obj)
{
#if defined(SPI_IP_VERSION_V2)
return (int)LL_SPI_IsActiveFlag_RXP(SPI_INST(obj));
#else /* SPI_IP_VERSION_V2 */
return (int)LL_SPI_IsActiveFlag_RXNE(SPI_INST(obj));
#endif /* SPI_IP_VERSION_V2 */