[参考译文] CCS/TM4C1294NCPDT：无法通过在 COM 端口中使用 UDMA 观察 UART 传输的数据

admin

请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

https://e2e.ti.com/support/tools/code-composer-studio-group/ccs/f/code-composer-studio-forum/779785/ccs-tm4c1294ncpdt-not-able-to-observe-uart-transferred-data-by-using-udma-in-com-port

器件型号：TM4C1294NCPDT

工具/软件：Code Composer Studio

HII、

我正在使用 uDMA 控制器将数据从存储器传输到 UART。如果我使用(HWREG (UART1_BASE + UART_O_CTL)|= UART_CTL_LBE)启用回路、那么我们能够在 ui8RxBufA、ui8RxBufB 缓冲区中看到数据、但无法在 COM 端口中传输数据。

#define MEM_buffer_size 1024
#define UART_TXBUF_SIZE 256
#define UART_RXBUF_SIZE 256

static uint8_t g_ui8TxBuf[UART_TXBUF_SIZE]；
static uint8_t g_ui8BufA[UART_UART32_size

=
静态 UART32_UART1uuuuuuuuuuuuuuuuuuuuuut




状态；i32uuuuuuuuuuuuuuuuuuuuuuuuuut 1 u32uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuut 1 ut 1 u32uuuuuuuuuuuuuuuuuuuuuuuuut 1 ut 1 uart32uuuuuuuuuut

ui32Status)；


ui32Mode = uDMAChannelModeGet (uDMA_CHANGE_UART1RX | UDMA_PRI_SELECT)；
if (ui32Mode = uDMA_MODE_STOP)
｛
g_ui32RxBudma++；
uDMAChannelTrSet (UART1_UART1_UART+)= u64_UART_UART_UART1AM_MODE+、UART_UART1+





(UART_UART+) UCC_UCC_U64_UCC_U64_U64_UART+(UART+) U64_UART_UART_UART_UART+= u_UCC_U64_U80+(u_UCC_U64_U64_UART+)；u_UCC_U64u_UCC_U64u+(u_UART_UART_UART_UART_UART_UART+) U64_U64u_R+(UCC_UCC_






｝

void InitUART1传输(void)
｛
uint_fast16_t ui16Idx；
for (ui16Idx = 0；ui16Idx < UART_TXBUF_SIZE；ui16Idx++)
g_ui8TxBuf[ui16Idx ='A'；SysART32_Periptl
(UART1_USYSCUSpurb


)外设1 (UART1_SysClipulk_SysConfigh)； 115200、UART_CONFIG_WLEN_8 | UART_CONFIG_STOP_ONE |UART_CONFIG_PAR_NONE)；
UARTFIFOLevelSet (UART1_BASE、UART_FIFO_TX4_8、UART_FIFO_RX4_8)；

UARTEnable (UART1_BASE)；
UARTDMAEnable (UART1_BASE、UART_DMA_RX | UART_DMA_TX)；
HWREG (UART1_BASE + UART_O_CTL)|= UART_CTL_LBE；
IntEnable (INT_UART1)；

//// 接收参数
uDMAChannelAttributeDisable (UDMA_CHANNE_UART1RX、UDMA_ATTR_ALTSELECT | UDMA_ATTR_USEBURST | UDMA_ATTR_HIGH_PRIORITY | UDMA_REQMASK)；
uDMA_ADC_UART1_DMA

(UART4_UART8_DR_UART4_SIZE | UART4_UART4_UARTR_AM_RINC_ADC_ADC_1、UART4_T4_ENDADC_ADC_ADC_1 | UART4_T4_ENTR_UART4_ENDANT_T4_T4_TADC_ADC_ADC_1 | UART4_ENDANT_UARTR_UARTR_8 (UARTR_UARTR_8)| UART4_TADC_ADC_ADC_ADC_ADC_ADC_ADC_ADC_ADC_ADC_1、UART_UART_UART_UART_UART_UART4_SIZE | UART_UART_UART_UART






void translitting paramter uDMAChannelAttributeDisable (UDMA_CHANNE_UART1TX、UDMA_ATTR_ALTSELECT | UDMA_ATTR_HIGH_PRORY | UDMA_ATTR_REQMASK)；uDMA_CHANNEL_Enable (UART1_DMA_UART1_UART1_UARTDA_UART8_UARTDA_TR_UDA_UDA_UDAM_UARTDAM_PRECH)；UART1_UART1_UART8_UARTDA_UART1_UARTDA_UART1_UARTDA_UART1_UART1_UARTDA_UARTDA_UARTDA_1 (UARTDA_UART1_UART1_UART1_UARTDA_UARTDA_UARTDA_UART1_UARTDA_UART1_UARTDA_UART1_UARTDA_1、UART1_UART1_U







int main (void)
｛
ui32SysClkFreq = SysCtlClockFreqSet ((SYSCTL_XTAL_25MHz | SYSCTL_MAIN | SYSCTL_USE_PLL | SYSCTL_CFG_VCO_480)、120000000)；
SysCtlPeripheralClockGating (tron)；SysCtl_USPEL (USYSCT_VCO_480)、SYSCPEDMA_Enable
(SYSC_PeripheralkHz
)
IntEnable (INT_UDMAERR)；
uDMAEnable()；
uDMAControlBaseSet (pui8ControlTable)；
InitUART1 Transfer()；
｝