ti最新芯片中PDMA传输文档

方块图
AHB
SPI 0 SPI 1 Master/Slave Wrapper CH0 Control Global Controller Global Controller SPI 2 SPI 3 UART 0 UART 1 USB ADC I2S
I/O, Decoder Registers
1 Word Buffer CH1 Control 1 Word Buffer
Initial SPI0 controller
Initial and setting PDMA controller
/* PDMA Init */ DrvPDMA_Init(); /* PDMA Setting, channel 0 = SPI0, read APB */ DrvPDMA_SetCHForAPBDevice(eDRVPDMA_CHANNEL_0, eDRVPDMA_SPI0, eDRVPDMA_READ_APB);
Bus Master Control
CH8 Control 1 Word Buffer
Memory-toMemory-to-Memory
从内存到内存搬动数据
PDMA_SARx
Source Addr.
PDMddr.
Source PDMA Controller Channel x Destination
使能 PDMA channel 0
PDMA驱动示例 PDMA驱动示例 (4/4)
PDMA0_INT_Flag = 0; /* SPI0 go */ DrvSPI_SetGo(eDRVSPI_PORT0);
触发 SPI0 go
/* Wait PDMA transfer done */ while(1) { 等待 PDMA channel if(PDMA0_INT_Flag == 1) { PDMA0_INT_Flag = 0; printf("\nSPI0 RX PDMA Transfer Done!!!\n”); break; } } DrvSPI_Close(eDRVSPI_PORT0); DrvPDMA_Close(); return 1; } void PDMA0_Callback(void) { PDMA0_INT_Flag = 1; }
PDMA驱动示例 PDMA驱动示例 (2/4)
/* Configure SPI0 as a master, type-1 waveform, 8-bit transaction */ DrvSPI_Open(eDRVSPI_PORT0, eDRVSPI_MASTER, eDRVSPI_TYPE1, 8); /* MSB First. */ DrvSPI_SetEndian(eDRVSPI_PORT0, eDRVSPI_MSB_FIRST); /* Enable the automatic slave select function of SS0. */ DrvSPI_EnableAutoCS(eDRVSPI_PORT0, eDRVSPI_SS0); /* Set the active level of slave select. */ DrvSPI_SetSlaveSelectActiveLevel(eDRVSPI_PORT0, eDRVSPI_ACTIVE_LOW_FALLING); /* enable SPI RX PDMA */ DrvSPI_StartPDMA(eDRVSPI_PORT0, eDRVSPI_RX_DMA, TRUE); /* SPI clock rate 1MHz */ DrvSPI_SetClock(eDRVSPI_PORT0, 1000000, 0);
Write locked register to initial HCLK
/* Unlock the protected registers */ UNLOCKREG(); /* Enable the 12MHz oscillator oscillation */ DrvSYS_SetOscCtrl(E_SYS_XTL12M, 1); /* HCLK clock source. 0: external 12MHz; 4:internal 22MHz RC oscillator */ DrvSYS_SetHCLKSource(0); LOCKREG(); /* HCLK clock frequency = HCLK clock source / (HCLK_N + 1) */ DrvSYS_SetClockDivider(E_SYS_HCLK_DIV, 0);
SAD_SEL
Source Addr. Direction Fixed
Destination
PDMA Controller Channel x
Source
APB IP Memory APB_TWS
Transfer Width Select 8/16/32-bits
中断
BLKD: 块传输完成 TABORT: 读/写 目标 Abort
/* Enable PDMA INT */ DrvPDMA_EnableInt(eDRVPDMA_CHANNEL_0, eDRVPDMA_BLKD );
使能 PDMA channel 0 中断
/* Install PDMA Callback function */ DrvPDMA_InstallCallBack(eDRVPDMA_CHANNEL_0, eDRVPDMA_BLKD, (PFN_DRVPDMA_CALLBACK) PDMA0_Callback ); /* Trigger PDMA specified Channel */ DrvPDMA_CHEnablelTransfer(eDRVPDMA_CHANNEL_0);
例子
利用PDMA从SPI flash移动数据到内存 SPI0 作为主模式, 8bits 数据宽
PDMA 驱动示例 (1/4)
#define TEST_LENGTH 256 uint8_t DestArray[TEST_LENGTH]; volatile uint32_t PDMA0_INT_Flag; void PDMA0_Callback(void); int main(void) { STR_PDMA_T sPDMA; uint32_t SPIPort;
PDMA_BCRx
Byte Counter
Memory
Memory-toMemory-to-APB IP
从内存到 APB IP
SAD_SEL
Source Addr. Direction Fixed or Incremental
DAD_SEL
Dest. Addr. Direction Fixed
Source
PDMA Controller Channel x
Destination
APB IP Memory APB_TWS
Transfer Width Select 8/16/32-bits
APB IP-to-Memory IP-to从APB IP到内存搬动数据
DAD_SEL
Dest. Addr. Direction Fixed or Incremental
NuMicro Cortex-M0 CortexPDMA
议题
特性 方块图 功能描述 示例
特性
九通道 DMA (Peripheral-to-Memory or Memory-toPeripheral or Memory-to-Memory) 一个内部 word buffer 源和目的地址有两种选择: 增加，固定 传输宽度可以选择：8/16/32
PDMA驱动示例 (3/4) 驱动示例
/* SPI Port = SPI0 Rx0 */ SPIPort = SPI0_BASE + 0x10; /* PDMA CH0 RX Setting */ sPDMA.sSrcAddr.u32Addr = sPDMA.sDestAddr.u32Addr = sPDMA.u8TransWidth = sPDMA.u8Mode = sPDMA.sSrcAddr.eAddrDirection = sPDMA.sDestAddr.eAddrDirection = sPDMA.i32ByteCnt = DrvPDMA_Open(eDRVPDMA_CHANNEL_0,
设定并打开PDMA channel 0
SPIPort; (uint32_t)DestArray; eDRVPDMA_WIDTH_8BITS; eDRVPDMA_MODE_APB2MEM; eDRVPDMA_DIRECTION_FIXED; eDRVPDMA_DIRECTION_INCREMENTED; TEST_LENGTH; &sPDMA);
0 传输完成
PDMA channel 0 回调函数
Q&A