roboot/stm32/roboot_if_comm_stm32.c

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/* ================================================================================ *//* ================================================================================= */


#include "stm32f10x.h"

#include "roboot_if_comm.h"
#include "config.h"


#if BOOTLOADER_USART == USART_1
#define USARTx USART1
#elif BOOTLOADER_USART == USART_2
#define USARTx USART2
#elif BOOTLOADER_USART == USART_3
#define USARTx USART3
#else
#error "Wrong USART configured"
#endif

/**************************************************************************************************\
\**************************************************************************************************/
void CommHwInit(void)
{
    USART_InitTypeDef USART_InitStructure;
    GPIO_InitTypeDef gpio_data;

    /* Enable USART clock */
#if BOOTLOADER_USART == USART_1
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE );
#elif BOOTLOADER_USART == USART_2
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE );
#elif BOOTLOADER_USART == USART_3
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE );
#endif

    USART_InitStructure.USART_BaudRate = BOOTLOADER_USART_SPEED;
    USART_InitStructure.USART_WordLength = USART_WordLength_8b;
#if BOOTLOADER_USART_STOPBITS == 1
    USART_InitStructure.USART_StopBits = USART_StopBits_1;
#elif BOOTLOADER_USART_STOPBITS == 2
    USART_InitStructure.USART_StopBits = USART_StopBits_2;
#else
#error "Wrong configuration for number of USART stop bits"
#endif
#if BOOTLOADER_USART_PARITY == USART_PARITY_NONE
    USART_InitStructure.USART_Parity = USART_Parity_No;
#elif BOOTLOADER_USART_PARITY == USART_PARITY_EVEN
    USART_InitStructure.USART_Parity = USART_Parity_Even;
#elif BOOTLOADER_USART_PARITY == USART_PARITY_ODD
    USART_InitStructure.USART_Parity = USART_Parity_Odd;
#else
#error "Wrong configuration for USART parity control"
#endif
#if BOOTLOADER_USART_FC == USART_FC_NONE
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
#elif BOOTLOADER_USART_FC == USART_FC_RTS
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_RTS;
#elif BOOTLOADER_USART_FC == USART_FC_CTS
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_CTS;
#elif BOOTLOADER_USART_FC == USART_FC_RTS_CTS
    USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_RTS_CTS;
#else
#error "Wrong configuration for USART parity control"
#endif
    USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

    USART_Init(USARTx, &USART_InitStructure);
    USART_Cmd(USARTx, ENABLE);

    /* setup serial output pins as an alternate functions */
    GPIO_StructInit(&gpio_data);

#if BOOTLOADER_USART == USART_1
    // USART1 TX
    gpio_data.GPIO_Pin = GPIO_Pin_9;
#if (BOOTLOADER_USART_FC == USART_FC_RTS) || (BOOTLOADER_USART_FC == USART_FC_RTS_CTS)
    // USART1 RTS
    gpio_data.GPIO_Pin |= GPIO_Pin_12;
#endif
    gpio_data.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &gpio_data);

    // USART1 RX
    gpio_data.GPIO_Pin = GPIO_Pin_10;
#if (BOOTLOADER_USART_FC == USART_FC_CTS) || (BOOTLOADER_USART_FC == USART_FC_RTS_CTS)
    // USART1 CTS
    gpio_data.GPIO_Pin |= GPIO_Pin_11;
#endif
    gpio_data.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &gpio_data);

#elif BOOTLOADER_USART == USART_2
    // USART2 TX
    gpio_data.GPIO_Pin = GPIO_Pin_2;
#if (BOOTLOADER_USART_FC == USART_FC_RTS) || (BOOTLOADER_USART_FC == USART_FC_RTS_CTS)
    // USART2 RTS
    gpio_data.GPIO_Pin |= GPIO_Pin_1;
#endif
    gpio_data.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &gpio_data);

    // USART2 RX
    gpio_data.GPIO_Pin = GPIO_Pin_3;
#if (BOOTLOADER_USART_FC == USART_FC_CTS) || (BOOTLOADER_USART_FC == USART_FC_RTS_CTS)
    // USART2 CTS
    gpio_data.GPIO_Pin |= GPIO_Pin_0;
#endif
    gpio_data.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &gpio_data);

#elif BOOTLOADER_USART == USART_3
    // USART3 TX

    gpio_data.GPIO_Pin = GPIO_Pin_10;
#if (BOOTLOADER_USART_FC == USART_FC_RTS) || (BOOTLOADER_USART_FC == USART_FC_RTS_CTS)
    // USART2 RTS
    gpio_data.GPIO_Pin |= GPIO_Pin_14;
#endif
    gpio_data.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOB, &gpio_data);

    // USART3 RX
    gpio_data.GPIO_Pin = GPIO_Pin_11;
#if (BOOTLOADER_USART_FC == USART_FC_CTS) || (BOOTLOADER_USART_FC == USART_FC_RTS_CTS)
    // USART3 CTS
    gpio_data.GPIO_Pin |= GPIO_Pin_13;
#endif
    gpio_data.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOB, &gpio_data);
#endif

}


/**************************************************************************************************\
\**************************************************************************************************/
void CommHwDeinit(void)
{
    USART_DeInit(USARTx);
}

/**************************************************************************************************\
\**************************************************************************************************/
void CommHwSendByte(uint8_t c)
{
    /* Loop until USART DR register is empty */
    while(USART_GetFlagStatus(USARTx, USART_FLAG_TXE) == RESET)
    {
        ;
    }
    USART_SendData(USARTx, c);
}


/**************************************************************************************************\
\**************************************************************************************************/
int16_t CommHwGetByte(void)
{
    if (USART_GetFlagStatus(USARTx, USART_FLAG_RXNE) == RESET)
    {
        return -1;
    }
    else
    {
        return (int16_t) (USART_ReceiveData(USARTx) & 0xFFU);
    }
}

/**************************************************************************************************\
\**************************************************************************************************/
void MCUBusyDelay(void)
{
    uint32_t delay;
    delay = 120UL;

    while (delay--)
    {
        __asm volatile
            (
                "   nop                     \n"
                "   nop                     \n"
                "   nop                     \n"
            );
    }
}

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