请教LPC54608 UART 功能, 配置完成后只能输出一个字符 '\0' ?

hpdell · 发表于 2023-3-4 14:31:20

本帖最后由 hpdell 于 2023-3-4 21:53 编辑

使用 FC4_UART 功能, 配置完成后只能输出一个字符 '\0' ?

单片机使用 LPC54608J512

相关程序如下:

#define IOCON_PIO_FUNC2 0x02u

void BOARD_InitPins(void)
{
/* Enables the clock for the IOCON block. 0 = Disable; 1 = Enable.: 0x01u */
CLOCK_EnableClock(kCLOCK_Iocon);

         const uint32_t port3_pin26_config = (/* Pin is configured as FC4_RXD_SDA_MOSI */
                                       IOCON_PIO_FUNC2 |
                                       /* No addition pin function */
                                       IOCON_PIO_MODE_INACT |
                                       /* Input function is not inverted */
                                       IOCON_PIO_INV_DI |
                                       /* Enables digital function */
                                       IOCON_PIO_DIGITAL_EN |
                                       /* Input filter disabled */
                                       IOCON_PIO_INPFILT_OFF |
                                       /* Standard mode, output slew rate control is enabled */
                                       IOCON_PIO_SLEW_STANDARD |
                                       /* Open drain is disabled */
                                       IOCON_PIO_OPENDRAIN_DI);
/* PORT3 PIN26 (coords: K5) is configured as FC4_RXD_SDA_MOSI */
IOCON_PinMuxSet(IOCON, 3U, 26U, port3_pin26_config);


const uint32_t port3_pin27_config = (/* Pin is configured as FC4_TXD_SCL_MISO */
                                       IOCON_PIO_FUNC2 |
                                       /* No addition pin function */
                                       IOCON_PIO_MODE_INACT |
                                       /* Input function is not inverted */
                                       IOCON_PIO_INV_DI |
                                       /* Enables digital function */
                                       IOCON_PIO_DIGITAL_EN |
                                       /* Input filter disabled */
                                       IOCON_PIO_INPFILT_OFF |
                                       /* Standard mode, output slew rate control is enabled */
                                       IOCON_PIO_SLEW_STANDARD |
                                       /* Open drain is disabled */
                                       IOCON_PIO_OPENDRAIN_DI);
/* PORT3 PIN27 (coords: P14) is configured as FC4_TXD_SCL_MISO */
IOCON_PinMuxSet(IOCON, 3U, 27U, port3_pin27_config);

}

status_t BOARD_InitDebugConsole(void)
{
#if ((SDK_DEBUGCONSOLE == DEBUGCONSOLE_REDIRECT_TO_SDK) || defined(SDK_DEBUGCONSOLE_UART))
status_t result;
/* attach 12 MHz clock to FLEXCOMM0 (debug console) */
CLOCK_AttachClk(BOARD_DEBUG_UART_CLK_ATTACH);
RESET_PeripheralReset(BOARD_DEBUG_UART_RST);
result = DbgConsole_Init(BOARD_DEBUG_UART_INSTANCE, BOARD_DEBUG_UART_BAUDRATE, BOARD_DEBUG_UART_TYPE,
                           BOARD_DEBUG_UART_CLK_FREQ);
assert(kStatus_Success == result);
return result;
#else
return kStatus_Success;
#endif
}

#define DEMO_USART       USART4
#define DEMO_USART_CLK_SRC  kCLOCK_Flexcomm0
#define DEMO_USART_CLK_FREQ CLOCK_GetFlexCommClkFreq(0)

uint8_t txbuff[] = "Usart polling example\r\nBoard will send back received characters\r\n";

int main(void)

{
BOARD_InitPins();
// BOARD_BootClockPLL220M();
BOARD_BootClockPLL180M();

BOARD_InitDebugConsole();

/*
   * config.baudRate_Bps = 115200U;
   * config.parityMode = kUSART_ParityDisabled;
   * config.stopBitCount = kUSART_OneStopBit;
   * config.loopback = false;
   * config.enableTx = false;
   * config.enableRx = false;
   */
USART_GetDefaultConfig(&config);
config.baudRate_Bps = BOARD_DEBUG_UART_BAUDRATE;
config.enableTx    = true;
config.enableRx    = true;

USART_Init(DEMO_USART, &config, DEMO_USART_CLK_FREQ);

USART_WriteBlocking(DEMO_USART, txbuff, sizeof(txbuff) - 1);

}

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