/**
 * @file uart_transport.c
 * @brief USART1 transmit helpers used by the application core.
 */

#include "uart_transport.h"

#include "main.h"

static volatile uint8_t g_dma_busy = 0u;

void uart_transport_init(void)
{
    LL_DMA_DisableStream(DMA2, LL_DMA_STREAM_7);
    LL_DMA_ClearFlag_TC7(DMA2);
    LL_DMA_ClearFlag_TE7(DMA2);
    LL_USART_EnableDMAReq_TX(USART1);
    LL_DMA_EnableIT_TC(DMA2, LL_DMA_STREAM_7);
    LL_DMA_EnableIT_TE(DMA2, LL_DMA_STREAM_7);
    g_dma_busy = 0u;
}

void uart_transport_reset(void)
{
    g_dma_busy = 0u;
}

void uart_transport_send_blocking(const uint8_t *data, uint16_t size)
{
    uint16_t index;

    for (index = 0u; index < size; ++index)
    {
        while (!LL_USART_IsActiveFlag_TXE(USART1))
        {
        }
        LL_USART_TransmitData8(USART1, data[index]);
    }
}

void uart_transport_send_dma(const uint8_t *data, uint16_t size)
{
    while (g_dma_busy != 0u)
    {
    }

    LL_DMA_DisableStream(DMA2, LL_DMA_STREAM_7);
    LL_DMA_ClearFlag_TC7(DMA2);
    LL_DMA_ClearFlag_TE7(DMA2);
    LL_DMA_ConfigAddresses(DMA2,
                           LL_DMA_STREAM_7,
                           (uint32_t)data,
                           LL_USART_DMA_GetRegAddr(USART1, LL_USART_DMA_REG_DATA_TRANSMIT),
                           LL_DMA_GetDataTransferDirection(DMA2, LL_DMA_STREAM_7));
    LL_DMA_SetDataLength(DMA2, LL_DMA_STREAM_7, size);
    g_dma_busy = 1u;
    LL_DMA_EnableStream(DMA2, LL_DMA_STREAM_7);
}

void uart_transport_mark_dma_complete(void)
{
    g_dma_busy = 0u;
}

bool uart_transport_is_dma_busy(void)
{
    return g_dma_busy != 0u;
}