编程cortex-m3的uart（Microsemi SmartFusion 2）

Question

我在cortex-m3编程一个基本的uart回声， 但我在腻子上变得光滑

使用100 MHz时钟频率用于cortex-m3

波特率57600

giberish输出可能是什么原因， uart 波特率与cortex-m3时钟频率有多重或某种关系，或者Amba总线频率与波特率有某种关系

程序如下 - ＆gt;

#include "drivers/mss_uart/mss_uart.h"


mss_uart_instance_t * const gp_my_uart = &g_mss_uart0;

/*==============================================================================
 * main function.
 */
int main()
{
    size_t rx_size;
    uint8_t rx_buff[1];

    /* Turn off the watchdog */
    SYSREG->WDOG_CR = 0;

    /*--------------------------------------------------------------------------
     * Initialize and configure UART.
     */
    MSS_UART_init(gp_my_uart,
                  MSS_UART_57600_BAUD,
                  MSS_UART_DATA_8_BITS | MSS_UART_NO_PARITY | MSS_UART_ONE_STOP_BIT);

    /*--------------------------------------------------------------------------
     * Send greeting message over the UART.
     */
    MSS_UART_polled_tx_string(gp_my_uart,(const uint8_t*)"\n\r\n\r**********************************************************************\n\r");
    MSS_UART_polled_tx_string(gp_my_uart,(const uint8_t*)"******************** SmartFusion2 MMUART Example *********************\n\r");
    MSS_UART_polled_tx_string(gp_my_uart,(const uint8_t*)"**********************************************************************\n\r");
    MSS_UART_polled_tx_string(gp_my_uart,(const uint8_t*)"Characters typed will be echoed back.\n\r");

    /*--------------------------------------------------------------------------
     * Echo back any characters received.
     */
    for (;;)
    {
        rx_size = MSS_UART_get_rx(gp_my_uart, rx_buff, sizeof(rx_buff));
        if( rx_size > 0 )
        {
            MSS_UART_polled_tx(gp_my_uart, rx_buff, sizeof(rx_buff));
        }
    }
}