Ch582作为spi slave,用dma发送接收的时候
如果ch582先是dma接收，然后转为dma发送，则第一次发送是从dma缓冲区第8个字节开始发送，而不是第一个字节开发发送
从第二次以后发送就正常了，不知道是怎么回事。下面的是代码
int main()
{
UINT8 i;
UINT16 bEnd;
UINT16 bStart;
UINT16 n;
UINT16 k;
UINT16 len;
SetSysClock(CLK_SOURCE_PLL_60MHz);
/* 配置串口调试 */
DebugInit();
PRINT("SpiTest Start @ChipID=%02X\r\n", R8_CHIP_ID);
//#if 0
/* 设备模式 */
//GPIO12:CS
//GPIO13:CLK
//GPIO14:MOSI
//GPIO15:MISO
PRINT("1.spi0 mul slave mode \n");
// GPIOA_ModeCfg(GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15, GPIO_ModeIN_PU);
GPIOA_ModeCfg(GPIO_Pin_12 | GPIO_Pin_13| GPIO_Pin_14 | GPIO_Pin_15, GPIO_ModeIN_Floating); //在pcb上已经有上拉电阻了
SPI0_SlaveInit();
R8_SPI0_CTRL_MOD |= RB_SPI_MST_SCK_MOD;
PRINT("R8_SPI0_CTRL_MOD=%x\r\n",R8_SPI0_CTRL_MOD); //空闲时 SCK 为高电平
len = 30;
for(i=0;i
spiBuffrevW[i] = i;
for(i=0;i
PRINT("%02x ", spiBuffrevW[i]);
PRINT("\r\n");
while (1)
{
//接收3次
for(n = 0;n<3;n++)
{
PRINT("recv=\r\n");
R8_SPI0_CTRL_MOD |= RB_SPI_MOSI_OE;
R8_SPI0_CTRL_MOD &= ~RB_SPI_MISO_OE;
R8_SPI0_CTRL_MOD |= RB_SPI_FIFO_DIR;
R16_SPI0_DMA_BEG = (uint32_t)spiBuffrev;
R16_SPI0_DMA_END = (uint32_t)(spiBuffrev + len);
R16_SPI0_TOTAL_CNT = len;
R8_SPI0_INT_FLAG = RB_SPI_IF_CNT_END | RB_SPI_IF_DMA_END;
R8_SPI0_CTRL_CFG |= RB_SPI_DMA_ENABLE |RB_SPI_DMA_LOOP;
bStart = 0;
while (1)
{
bEnd = GPIOA_ReadPortPin(GPIO_Pin_12);//检测cs引脚是否拉高，如果拉高了则结束
if(bEnd==0)
bStart = 1;
if(bStart && bEnd //如果先检测到cs拉低，然后检测到拉高则结束
|| (R8_SPI0_INT_FLAG & RB_SPI_IF_CNT_END))
break;
}
R8_SPI0_FIFO_COUNT = 0;
R8_SPI0_FIFO_COUNT1 = 0;
R8_SPI0_CTRL_CFG &= ~RB_SPI_DMA_ENABLE;
int i;
PRINT("fin=%x ",bEnd);
for(i=0;i
PRINT("%02x ", spiBuffrev[i]);
PRINT("\r\n");
}
//作为设备模式发送3次
//spi master第一次接收到的值从8开始 08 09 0A 0B 0C 0D 0E 0F ....
//spi master第二次接收到的值从0开始 00 01 02 03 04 05 06 07 ....
//spi master第三次接收到的值从0开始 00 01 02 03 04 05 06 07 ....
//发送序列通过逻辑分析仪查看过了，应该不是spi master端的问题
for(n = 0;n<3;n++)
{
PRINT("Send=%p \r\n",spiBuffrevW);
PRINT("Send:%p cnt=%x cnt1=%x\r\n",spiBuffrevW,R8_SPI0_FIFO_COUNT,R8_SPI0_FIFO_COUNT1);
for(i=0;i
spiBuffrevW[i] = i; //初始化发送值，00 01 02 03 04 05 06 07 ....
R8_SPI0_CTRL_MOD |= RB_SPI_MISO_OE;
R8_SPI0_CTRL_MOD &= ~RB_SPI_MOSI_OE;
R8_SPI0_CTRL_MOD &= ~RB_SPI_FIFO_DIR;
R16_SPI0_DMA_BEG = (uint32_t)spiBuffrevW;
R16_SPI0_DMA_END = (uint32_t)(spiBuffrevW+ len);
R16_SPI0_TOTAL_CNT = len;
R8_SPI0_INT_FLAG = RB_SPI_IF_CNT_END | RB_SPI_IF_DMA_END;
R8_SPI0_CTRL_CFG |= RB_SPI_DMA_ENABLE |RB_SPI_DMA_LOOP;
bStart = 0; //cs引脚是否拉底过
while (1)
{
bEnd = GPIOA_ReadPortPin(GPIO_Pin_12); //检测cs引脚是否拉高，如果拉高了则结束
if(bEnd==0)
bStart = 1;
if(bStart && bEnd || (R8_SPI0_INT_FLAG & RB_SPI_IF_CNT_END))
break;
}
R8_SPI0_CTRL_CFG &= ~RB_SPI_DMA_ENABLE;
PRINT("Send:cnt=%x cnt1=%x\r\n",R8_SPI0_FIFO_COUNT,R8_SPI0_FIFO_COUNT1);
PRINT("fin=%x\r\n",bEnd);
}
}
PRINT("END ...\n");
while(1);
//#endif
while(1);
}