platform_result_t platform_spi_init( const platform_spi_t* spi, const platform_spi_config_t* config )
{
SPI_InitTypeDef spi_init;
platform_result_t result;
uint8_t spi_number;
wiced_assert( "bad argument", ( spi != NULL ) && ( config != NULL ) );
platform_mcu_powersave_disable();
spi_number = platform_spi_get_port_number( spi->port );
/* Init SPI GPIOs */
platform_gpio_set_alternate_function( spi->pin_clock->port, spi->pin_clock->pin_number, GPIO_OType_PP, GPIO_PuPd_NOPULL, spi->gpio_af );
platform_gpio_set_alternate_function( spi->pin_mosi->port, spi->pin_mosi->pin_number, GPIO_OType_PP, GPIO_PuPd_NOPULL, spi->gpio_af );
platform_gpio_set_alternate_function( spi->pin_miso->port, spi->pin_miso->pin_number, GPIO_OType_PP, GPIO_PuPd_NOPULL, spi->gpio_af );
/* Init the chip select GPIO */
platform_gpio_init( config->chip_select, OUTPUT_PUSH_PULL );
platform_gpio_output_high( config->chip_select );
/* Calculate prescaler */
result = calculate_prescaler( config->speed, &spi_init.SPI_BaudRatePrescaler );
if ( result != PLATFORM_SUCCESS )
{
platform_mcu_powersave_enable();
return result;
}
/* Configure data-width */
if ( config->bits == 8 )
{
spi_init.SPI_DataSize = SPI_DataSize_8b;
}
else if ( config->bits == 16 )
{
if ( config->mode & SPI_USE_DMA )
{
platform_mcu_powersave_enable();
/* 16 bit mode is not supported for a DMA */
return PLATFORM_UNSUPPORTED;
}
spi_init.SPI_DataSize = SPI_DataSize_16b;
}
else
{
platform_mcu_powersave_enable();
/* Requested mode is not supported */
return PLATFORM_UNSUPPORTED;
}
/* Configure MSB or LSB */
if ( config->mode & SPI_MSB_FIRST )
{
spi_init.SPI_FirstBit = SPI_FirstBit_MSB;
}
else
{
spi_init.SPI_FirstBit = SPI_FirstBit_LSB;
}
/* Configure mode CPHA and CPOL */
if ( config->mode & SPI_CLOCK_IDLE_HIGH )
{
spi_init.SPI_CPOL = SPI_CPOL_High;
}
else
{
spi_init.SPI_CPOL = SPI_CPOL_Low;
}
if ( config->mode & SPI_CLOCK_RISING_EDGE )
{
spi_init.SPI_CPHA = ( config->mode & SPI_CLOCK_IDLE_HIGH ) ? SPI_CPHA_2Edge : SPI_CPHA_1Edge;
}
else
{
spi_init.SPI_CPHA = ( config->mode & SPI_CLOCK_IDLE_HIGH ) ? SPI_CPHA_1Edge : SPI_CPHA_2Edge;
}
/* Enable SPI peripheral clock */
spi_peripheral_clock_functions[ spi_number ]( spi_peripheral_clocks[ spi_number ], ENABLE );
spi_init.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
spi_init.SPI_Mode = SPI_Mode_Master;
spi_init.SPI_NSS = SPI_NSS_Soft;
spi_init.SPI_CRCPolynomial = 0x7; /* reset value */
SPI_CalculateCRC( spi->port, DISABLE );
/* Init and enable SPI */
SPI_Init( spi->port, &spi_init );
SPI_Cmd ( spi->port, ENABLE );
platform_mcu_powersave_enable();
return WICED_SUCCESS;
}
OSStatus platform_spi_init( platform_spi_driver_t* driver, const platform_spi_t* peripheral, const platform_spi_config_t* config )
{
SPI_InitTypeDef spi_init;
OSStatus err;
platform_mcu_powersave_disable();
require_action_quiet( ( driver != NULL ) && ( peripheral != NULL ) && ( config != NULL ), exit, err = kParamErr);
/* Calculate prescaler */
err = calculate_prescaler( config->speed, &spi_init.SPI_BaudRatePrescaler );
require_noerr(err, exit);
/* Configure data-width */
if ( config->bits == 8 )
{
spi_init.SPI_DataSize = SPI_DataSize_8b;
}
else if ( config->bits == 16 )
{
require_action( !(config->mode & SPI_USE_DMA), exit, err = kUnsupportedErr);
spi_init.SPI_DataSize = SPI_DataSize_16b;
}
else
{
err = kUnsupportedErr;
goto exit;
}
/* Configure MSB or LSB */
if ( config->mode & SPI_MSB_FIRST )
{
spi_init.SPI_FirstBit = SPI_FirstBit_MSB;
}
else
{
spi_init.SPI_FirstBit = SPI_FirstBit_LSB;
}
/* Configure mode CPHA and CPOL */
if ( config->mode & SPI_CLOCK_IDLE_HIGH )
{
spi_init.SPI_CPOL = SPI_CPOL_High;
}
else
{
spi_init.SPI_CPOL = SPI_CPOL_Low;
}
if ( config->mode & SPI_CLOCK_RISING_EDGE )
{
spi_init.SPI_CPHA = ( config->mode & SPI_CLOCK_IDLE_HIGH ) ? SPI_CPHA_2Edge : SPI_CPHA_1Edge;
}
else
{
spi_init.SPI_CPHA = ( config->mode & SPI_CLOCK_IDLE_HIGH ) ? SPI_CPHA_1Edge : SPI_CPHA_2Edge;
}
driver->peripheral = (platform_spi_t *)peripheral;
/* Init SPI GPIOs */
platform_gpio_set_alternate_function( peripheral->pin_clock->port, peripheral->pin_clock->pin_number, GPIO_OType_PP, GPIO_PuPd_NOPULL, peripheral->gpio_af );
platform_gpio_set_alternate_function( peripheral->pin_mosi->port, peripheral->pin_mosi->pin_number, GPIO_OType_PP, GPIO_PuPd_NOPULL, peripheral->gpio_af );
platform_gpio_set_alternate_function( peripheral->pin_miso->port, peripheral->pin_miso->pin_number, GPIO_OType_PP, GPIO_PuPd_UP, peripheral->gpio_af );
/* Init the chip select GPIO */
platform_gpio_init( config->chip_select, OUTPUT_PUSH_PULL );
platform_gpio_output_high( config->chip_select );
/* Enable SPI peripheral clock */
(peripheral->peripheral_clock_func)( peripheral->peripheral_clock_reg, ENABLE );
(peripheral->peripheral_clock_func)( peripheral->peripheral_clock_reg, ENABLE );
SPI_I2S_DeInit( peripheral->port );
spi_init.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
spi_init.SPI_Mode = SPI_Mode_Master;
spi_init.SPI_NSS = SPI_NSS_Soft;
spi_init.SPI_CRCPolynomial = 0x7; /* reset value */
SPI_CalculateCRC( peripheral->port, DISABLE );
/* Init and enable SPI */
SPI_Init( peripheral->port, &spi_init );
SPI_I2S_DMACmd( peripheral->port, SPI_I2S_DMAReq_Rx, DISABLE );
SPI_I2S_DMACmd( peripheral->port, SPI_I2S_DMAReq_Tx, DISABLE );
SPI_Cmd ( peripheral->port, ENABLE );
if ( config->mode & SPI_USE_DMA ){
DMA_DeInit( peripheral->rx_dma.stream );
DMA_DeInit( peripheral->tx_dma.stream );
if ( peripheral->tx_dma.controller == DMA1 )
{
RCC->AHB1ENR |= RCC_AHB1Periph_DMA1;
}
else
{
RCC->AHB1ENR |= RCC_AHB1Periph_DMA2;
}
if ( peripheral->rx_dma.controller == DMA1 )
{
RCC->AHB1ENR |= RCC_AHB1Periph_DMA1;
}
else
{
RCC->AHB1ENR |= RCC_AHB1Periph_DMA2;
}
SPI_I2S_DMACmd( peripheral->port, SPI_I2S_DMAReq_Rx, ENABLE );
SPI_I2S_DMACmd( peripheral->port, SPI_I2S_DMAReq_Tx, ENABLE );
}
exit:
platform_mcu_powersave_enable();
return err;
}