static OSStatus receive_bytes( platform_uart_driver_t* driver, void* data, uint32_t size, uint32_t timeout )
{
OSStatus err = kNoErr;
if ( driver->rx_buffer != NULL )
{
driver->peripheral->rx_dma_config.stream->CR |= DMA_SxCR_CIRC;
// Enabled individual byte interrupts so progress can be updated
USART_ClearITPendingBit( driver->peripheral->port, USART_IT_RXNE );
USART_ITConfig( driver->peripheral->port, USART_IT_RXNE, ENABLE );
}
else
{
driver->rx_size = size;
driver->peripheral->rx_dma_config.stream->CR &= ~(uint32_t) DMA_SxCR_CIRC;
}
clear_dma_interrupts( driver->peripheral->rx_dma_config.stream, driver->peripheral->rx_dma_config.complete_flags | driver->peripheral->rx_dma_config.error_flags );
driver->peripheral->rx_dma_config.stream->NDTR = size;
driver->peripheral->rx_dma_config.stream->M0AR = (uint32_t)data;
driver->peripheral->rx_dma_config.stream->CR |= DMA_SxCR_EN;
USART_DMACmd( driver->peripheral->port, USART_DMAReq_Rx, ENABLE );
if ( timeout > 0 )
{
err = mico_rtos_get_semaphore( &driver->rx_complete, timeout );
}
return err;
}
OSStatus host_platform_spi_transfer( bus_transfer_direction_t dir, uint8_t* buffer, uint16_t buffer_length )
{
OSStatus result;
uint32_t junk;
platform_mcu_powersave_disable();
wifi_spi.tx_dma.stream->NDTR = buffer_length;
wifi_spi.tx_dma.stream->M0AR = (uint32_t) buffer;
if ( dir == BUS_READ )
{
wifi_spi.rx_dma.stream->NDTR = buffer_length;
wifi_spi.rx_dma.stream->M0AR = (uint32_t) buffer;
wifi_spi.rx_dma.stream->CR |= DMA_MemoryInc_Enable | ( 1 << 4);
}
else
{
wifi_spi.rx_dma.stream->NDTR = buffer_length;
wifi_spi.rx_dma.stream->M0AR = (uint32_t) &junk;
wifi_spi.rx_dma.stream->CR &= ( ~DMA_MemoryInc_Enable ) | ( 1 << 4);
}
platform_gpio_output_low( &wifi_spi_pins[WIFI_PIN_SPI_CS] );
DMA_Cmd( wifi_spi.rx_dma.stream, ENABLE );
DMA_Cmd( wifi_spi.tx_dma.stream, ENABLE );
/* Wait for DMA TX to complete */
result = mico_rtos_get_semaphore( &spi_transfer_finished_semaphore, 100 );
// loop_count = 0;
// while ( ( DMA_GetFlagStatus( SPIX_DMA_RX_STREAM, DMA_FLAG_TCIF3 ) == RESET ) && ( loop_count < (uint32_t) DMA_TIMEOUT_LOOPS ) )
// {
// loop_count++;
// }
DMA_Cmd( wifi_spi.rx_dma.stream, DISABLE );
DMA_Cmd( wifi_spi.tx_dma.stream, DISABLE );
/* Clear the CS pin and the DMA status flag */
platform_gpio_output_high( &wifi_spi_pins[WIFI_PIN_SPI_CS] ); /* CS high (to deselect) */
clear_dma_interrupts( wifi_spi.rx_dma.stream, wifi_spi.rx_dma.complete_flags );
clear_dma_interrupts( wifi_spi.tx_dma.stream, wifi_spi.tx_dma.complete_flags );
platform_mcu_powersave_enable();
return result;
}
void platform_uart_rx_dma_irq( platform_uart_driver_t* driver )
{
if ( ( get_dma_irq_status( driver->peripheral->rx_dma_config.stream ) & driver->peripheral->rx_dma_config.complete_flags ) != 0 )
{
clear_dma_interrupts( driver->peripheral->rx_dma_config.stream, driver->peripheral->rx_dma_config.complete_flags );
driver->last_receive_result = kNoErr;
}
if ( ( get_dma_irq_status( driver->peripheral->rx_dma_config.stream ) & driver->peripheral->rx_dma_config.error_flags ) != 0 )
{
clear_dma_interrupts( driver->peripheral->rx_dma_config.stream, driver->peripheral->rx_dma_config.error_flags );
driver->last_receive_result = kGeneralErr;
}
if ( driver->rx_size > 0 )
{
/* Set semaphore regardless of result to prevent waiting thread from locking up */
mico_rtos_set_semaphore( &driver->rx_complete );
}
}
OSStatus platform_uart_transmit_bytes( platform_uart_driver_t* driver, const uint8_t* data_out, uint32_t size )
{
OSStatus err = kNoErr;
platform_mcu_powersave_disable();
#ifndef NO_MICO_RTOS
mico_rtos_lock_mutex( &driver->tx_mutex );
#endif
require_action_quiet( ( driver != NULL ) && ( data_out != NULL ) && ( size != 0 ), exit, err = kParamErr);
/* Clear interrupt status before enabling DMA otherwise error occurs immediately */
clear_dma_interrupts( driver->peripheral->tx_dma_config.stream, driver->peripheral->tx_dma_config.complete_flags | driver->peripheral->tx_dma_config.error_flags );
/* Init DMA parameters and variables */
driver->last_transmit_result = kGeneralErr;
driver->tx_size = size;
driver->peripheral->tx_dma_config.stream->CR &= ~(uint32_t) DMA_SxCR_CIRC;
driver->peripheral->tx_dma_config.stream->NDTR = size;
driver->peripheral->tx_dma_config.stream->M0AR = (uint32_t)data_out;
USART_DMACmd( driver->peripheral->port, USART_DMAReq_Tx, ENABLE );
USART_ClearFlag( driver->peripheral->port, USART_FLAG_TC );
driver->peripheral->tx_dma_config.stream->CR |= DMA_SxCR_EN;
/* Wait for transmission complete */
#ifndef NO_MICO_RTOS
mico_rtos_get_semaphore( &driver->tx_complete, MICO_NEVER_TIMEOUT );
#else
while( driver->tx_complete == false );
driver->tx_complete = false;
#endif
while ( ( driver->peripheral->port->SR & USART_SR_TC ) == 0 )
{
}
/* Disable DMA and clean up */
USART_DMACmd( driver->peripheral->port, USART_DMAReq_Tx, DISABLE );
driver->tx_size = 0;
err = driver->last_transmit_result;
exit:
#ifndef NO_MICO_RTOS
mico_rtos_unlock_mutex( &driver->tx_mutex );
#endif
platform_mcu_powersave_enable();
return err;
}
void platform_uart_tx_dma_irq( platform_uart_driver_t* driver )
{
if ( ( get_dma_irq_status( driver->peripheral->tx_dma_config.stream ) & driver->peripheral->tx_dma_config.complete_flags ) != 0 )
{
clear_dma_interrupts( driver->peripheral->tx_dma_config.stream, driver->peripheral->tx_dma_config.complete_flags );
driver->last_transmit_result = kNoErr;
}
if ( ( get_dma_irq_status( driver->peripheral->tx_dma_config.stream ) & driver->peripheral->tx_dma_config.error_flags ) != 0 )
{
clear_dma_interrupts( driver->peripheral->tx_dma_config.stream, driver->peripheral->tx_dma_config.error_flags );
driver->last_transmit_result = kGeneralErr;
}
if ( driver->tx_size > 0 )
{
#ifndef NO_MICO_RTOS
/* Set semaphore regardless of result to prevent waiting thread from locking up */
mico_rtos_set_semaphore( &driver->tx_complete );
#else
driver->tx_complete = true;
#endif
}
}
static OSStatus receive_bytes( platform_uart_driver_t* driver, void* data, uint32_t size, uint32_t timeout )
{
OSStatus err = kNoErr;
if ( driver->rx_buffer != NULL )
{
driver->peripheral->rx_dma_config.stream->CR |= DMA_SxCR_CIRC;
// Enabled individual byte interrupts so progress can be updated
USART_ClearITPendingBit( driver->peripheral->port, USART_IT_RXNE );
USART_ITConfig( driver->peripheral->port, USART_IT_RXNE, ENABLE );
}
else
{
driver->rx_size = size;
driver->peripheral->rx_dma_config.stream->CR &= ~(uint32_t) DMA_SxCR_CIRC;
}
clear_dma_interrupts( driver->peripheral->rx_dma_config.stream, driver->peripheral->rx_dma_config.complete_flags | driver->peripheral->rx_dma_config.error_flags );
driver->peripheral->rx_dma_config.stream->NDTR = size;
driver->peripheral->rx_dma_config.stream->M0AR = (uint32_t)data;
driver->peripheral->rx_dma_config.stream->CR |= DMA_SxCR_EN;
USART_DMACmd( driver->peripheral->port, USART_DMAReq_Rx, ENABLE );
if ( timeout > 0 )
{
#ifndef NO_MICO_RTOS
err = mico_rtos_get_semaphore( &driver->rx_complete, timeout );
#else
driver->rx_complete = false;
int delay_start = mico_get_time_no_os();
while( driver->rx_complete == false ) {
if(mico_get_time_no_os() >= delay_start + timeout && timeout != MICO_NEVER_TIMEOUT) {
err = kTimeoutErr;
goto exit;
}
}
#endif
}
exit:
return err;
}
OSStatus platform_uart_init( platform_uart_driver_t* driver, const platform_uart_t* peripheral, const platform_uart_config_t* config, ring_buffer_t* optional_ring_buffer )
{
DMA_InitTypeDef dma_init_structure;
USART_InitTypeDef uart_init_structure;
uint32_t uart_number;
OSStatus err = kNoErr;
platform_mcu_powersave_disable();
require_action_quiet( ( driver != NULL ) && ( peripheral != NULL ) && ( config != NULL ), exit, err = kParamErr);
require_action_quiet( (optional_ring_buffer == NULL) || ((optional_ring_buffer->buffer != NULL ) && (optional_ring_buffer->size != 0)), exit, err = kParamErr);
uart_number = platform_uart_get_port_number( peripheral->port );
driver->rx_size = 0;
driver->tx_size = 0;
driver->last_transmit_result = kNoErr;
driver->last_receive_result = kNoErr;
driver->peripheral = (platform_uart_t*)peripheral;
#ifndef NO_MICO_RTOS
mico_rtos_init_semaphore( &driver->tx_complete, 1 );
mico_rtos_init_semaphore( &driver->rx_complete, 1 );
mico_rtos_init_semaphore( &driver->sem_wakeup, 1 );
mico_rtos_init_mutex ( &driver->tx_mutex );
#else
driver->tx_complete = false;
driver->rx_complete = false;
#endif
/* Configure TX and RX pin_mapping */
platform_gpio_set_alternate_function( peripheral->pin_tx->port, peripheral->pin_tx->pin_number, GPIO_OType_PP, GPIO_PuPd_NOPULL, uart_alternate_functions[ uart_number ] );
platform_gpio_set_alternate_function( peripheral->pin_rx->port, peripheral->pin_rx->pin_number, GPIO_OType_PP, GPIO_PuPd_NOPULL, uart_alternate_functions[ uart_number ] );
if ( ( peripheral->pin_cts != NULL ) && ( config->flow_control == FLOW_CONTROL_CTS || config->flow_control == FLOW_CONTROL_CTS_RTS ) )
{
platform_gpio_set_alternate_function( peripheral->pin_cts->port, peripheral->pin_cts->pin_number, GPIO_OType_PP, GPIO_PuPd_NOPULL, uart_alternate_functions[ uart_number ] );
}
if ( ( peripheral->pin_rts != NULL ) && ( config->flow_control == FLOW_CONTROL_RTS || config->flow_control == FLOW_CONTROL_CTS_RTS ) )
{
platform_gpio_set_alternate_function( peripheral->pin_rts->port, peripheral->pin_rts->pin_number, GPIO_OType_PP, GPIO_PuPd_NOPULL, uart_alternate_functions[ uart_number ] );
}
#ifndef NO_MICO_RTOS
if(config->flags & UART_WAKEUP_ENABLE) {
mico_rtos_init_semaphore( driver->sem_wakeup, 1 );
mico_rtos_create_thread(NULL, MICO_APPLICATION_PRIORITY, "UART_WAKEUP", thread_wakeup, 0x100, driver);
}
#endif
/* Enable UART peripheral clock */
uart_peripheral_clock_functions[ uart_number ]( uart_peripheral_clocks[ uart_number ], ENABLE );
uart_init_structure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
uart_init_structure.USART_BaudRate = config->baud_rate;
uart_init_structure.USART_WordLength = ( ( config->data_width == DATA_WIDTH_9BIT ) || ( ( config->data_width == DATA_WIDTH_8BIT ) && ( config->parity != NO_PARITY ) ) ) ? USART_WordLength_9b : USART_WordLength_8b;
uart_init_structure.USART_StopBits = ( config->stop_bits == STOP_BITS_1 ) ? USART_StopBits_1 : USART_StopBits_2;
switch ( config->parity )
{
case NO_PARITY:
uart_init_structure.USART_Parity = USART_Parity_No;
break;
case EVEN_PARITY:
uart_init_structure.USART_Parity = USART_Parity_Even;
break;
case ODD_PARITY:
uart_init_structure.USART_Parity = USART_Parity_Odd;
break;
default:
err = kParamErr;
goto exit;
}
switch ( config->flow_control )
{
case FLOW_CONTROL_DISABLED:
uart_init_structure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
break;
case FLOW_CONTROL_CTS:
uart_init_structure.USART_HardwareFlowControl = USART_HardwareFlowControl_CTS;
break;
case FLOW_CONTROL_RTS:
uart_init_structure.USART_HardwareFlowControl = USART_HardwareFlowControl_RTS;
break;
case FLOW_CONTROL_CTS_RTS:
uart_init_structure.USART_HardwareFlowControl = USART_HardwareFlowControl_RTS_CTS;
break;
default:
err = kParamErr;
goto exit;
}
/* Initialise USART peripheral */
USART_DeInit( peripheral->port );
USART_Init( peripheral->port, &uart_init_structure );
/**************************************************************************
* Initialise STM32 DMA registers
* Note: If DMA is used, USART interrupt isn't enabled.
**************************************************************************/
/* Enable DMA peripheral clock */
if ( peripheral->tx_dma_config.controller == DMA1 )
{
RCC->AHB1ENR |= RCC_AHB1Periph_DMA1;
}
else
{
RCC->AHB1ENR |= RCC_AHB1Periph_DMA2;
}
/* Fill init structure with common DMA settings */
dma_init_structure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
dma_init_structure.DMA_MemoryInc = DMA_MemoryInc_Enable;
dma_init_structure.DMA_Priority = DMA_Priority_VeryHigh;
dma_init_structure.DMA_FIFOMode = DMA_FIFOMode_Disable;
dma_init_structure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
dma_init_structure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
dma_init_structure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
if ( config->data_width == DATA_WIDTH_9BIT )
{
dma_init_structure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
dma_init_structure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
}
else
{
dma_init_structure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
dma_init_structure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
}
/* Initialise TX DMA */
DMA_DeInit( peripheral->tx_dma_config.stream );
dma_init_structure.DMA_Channel = peripheral->tx_dma_config.channel;
dma_init_structure.DMA_PeripheralBaseAddr = (uint32_t) &peripheral->port->DR;
dma_init_structure.DMA_Memory0BaseAddr = (uint32_t) 0;
dma_init_structure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
dma_init_structure.DMA_BufferSize = 0xFFFF; // This parameter will be configured during communication
dma_init_structure.DMA_Mode = DMA_Mode_Normal;
DMA_Init( peripheral->tx_dma_config.stream, &dma_init_structure );
/* Initialise RX DMA */
DMA_DeInit( peripheral->rx_dma_config.stream );
dma_init_structure.DMA_Channel = peripheral->rx_dma_config.channel;
dma_init_structure.DMA_PeripheralBaseAddr = (uint32_t) &peripheral->port->DR;
dma_init_structure.DMA_Memory0BaseAddr = (uint32_t) 0;
dma_init_structure.DMA_DIR = DMA_DIR_PeripheralToMemory;
dma_init_structure.DMA_BufferSize = 0xFFFF; // This parameter will be configured during communication
dma_init_structure.DMA_Mode = DMA_Mode_Normal;
DMA_Init( peripheral->rx_dma_config.stream, &dma_init_structure );
/**************************************************************************
* Initialise STM32 DMA interrupts
**************************************************************************/
/* Configure TX DMA interrupt on Cortex-M3 */
NVIC_EnableIRQ( peripheral->tx_dma_config.irq_vector );
/* Enable TC (transfer complete) and TE (transfer error) interrupts on source */
clear_dma_interrupts( peripheral->tx_dma_config.stream, peripheral->tx_dma_config.complete_flags | peripheral->tx_dma_config.error_flags );
DMA_ITConfig( peripheral->tx_dma_config.stream, DMA_INTERRUPT_FLAGS, ENABLE );
/* Enable USART interrupt vector in Cortex-M3 */
NVIC_EnableIRQ( uart_irq_vectors[uart_number] );
USART_DMACmd( driver->peripheral->port, USART_DMAReq_Tx, DISABLE );
/* Enable USART */
USART_Cmd( peripheral->port, ENABLE );
/* Enable both transmit and receive */
peripheral->port->CR1 |= USART_CR1_TE;
peripheral->port->CR1 |= USART_CR1_RE;
/* Setup ring buffer */
if ( optional_ring_buffer != NULL )
{
/* Note that the ring_buffer should've been initialised first */
driver->rx_buffer = optional_ring_buffer;
driver->rx_size = 0;
receive_bytes( driver, optional_ring_buffer->buffer, optional_ring_buffer->size, 0 );
}
else
{
/* Not using ring buffer. Configure RX DMA interrupt on Cortex-M3 */
NVIC_EnableIRQ( peripheral->rx_dma_config.irq_vector );
/* Enable TC (transfer complete) and TE (transfer error) interrupts on source */
clear_dma_interrupts( peripheral->rx_dma_config.stream, peripheral->rx_dma_config.complete_flags | peripheral->rx_dma_config.error_flags );
DMA_ITConfig( peripheral->rx_dma_config.stream, DMA_INTERRUPT_FLAGS, ENABLE );
}
exit:
MicoMcuPowerSaveConfig(true);
return err;
}
void platform_wifi_spi_rx_dma_irq( void )
{
/* Clear interrupt */
clear_dma_interrupts( wifi_spi.rx_dma.stream, wifi_spi.rx_dma.complete_flags );
mico_rtos_set_semaphore( &spi_transfer_finished_semaphore );
}