芯片为C6678，SPI NOR FLASH型号为N25Q128A11ESF40F，板子是自己设计的。目前只有I2C和GPIO测试通过了。测试SPI时候遇到很多问题，以下是SPI测试过程的一些记录。本人软件基础比较薄弱，希望大神帮忙分析下。
1． 最初启动配置为SPI启动模式，运行SPI测试例程时提示DDR3 Leveling failed，后来看了论坛说要修改DDR3的初始化参数，按照官网提供的表格修改后没有再提示Leveling failed。
2． 但是SPI测试程序跑不通。后来看SPI的测试文档说要改为no boot mode。
3． 之后将启动方式修改为no boot mode，程序编译完加载的时候提示如下：
C66xx_0: GEL Output: Setup_Memory_Map...
C66xx_0: GEL Output: Setup_Memory_Map... Done.
C66xx_0: GEL Output:
Connecting Target...
C66xx_0: GEL Output: DSP core #0
C66xx_0: GEL Output: C6678L GEL file Ver is 2.005
C66xx_0: GEL Output: Global Default Setup...
C66xx_0: GEL Output: Setup Cache...
C66xx_0: GEL Output: L1P = 32K
C66xx_0: GEL Output: L1D = 32K
C66xx_0: GEL Output: L2 = ALL SRAM
C66xx_0: GEL Output: Setup Cache... Done.
C66xx_0: GEL Output: Main PLL (PLL1) Setup ...
C66xx_0: GEL Output: PLL in Bypass ...
C66xx_0: GEL Output: PLL1 Setup for DSP @ 1000.0 MHz.
C66xx_0: GEL Output: SYSCLK2 = 333.3333 MHz, SYSCLK5 = 200.0 MHz.
C66xx_0: GEL Output: SYSCLK8 = 15.625 MHz.
C66xx_0: GEL Output: PLL1 Setup... Done.
C66xx_0: GEL Output: Power on all PSC modules and DSP domains...
C66xx_0: GEL Output: Security Accelerator disabled!
C66xx_0: GEL Output: Power on all PSC modules and DSP domains... Done.
C66xx_0: GEL Output: PA PLL (PLL3) Setup ...
C66xx_0: GEL Output: PA PLL Setup... Done.
C66xx_0: GEL Output: DDR3 PLL (PLL2) Setup ...
C66xx_0: GEL Output: DDR3 PLL Setup... Done.
C66xx_0: GEL Output: DDR begin (1333 auto)
C66xx_0: GEL Output: XMC Setup ... Done
——————————————————————————————
C66xx_0: GEL Output:
DDR3 initialization is complete.
C66xx_0: GEL Output: DDR done
C66xx_0: GEL Output: DDR3 memory test... Started
C66xx_0: GEL Output: DDR3 memory test... Failed
C66xx_0: GEL Output: Main PLL (PLL1) Setup ...
C66xx_0: GEL Output: PLL not in Bypass, Enable BYPASS in the PLL Controller...
C66xx_0: GEL Output: PLL1 Setup for DSP @ 1000.0 MHz.
C66xx_0: GEL Output: SYSCLK2 = 333.3333 MHz, SYSCLK5 = 200.0 MHz.
C66xx_0: GEL Output: SYSCLK8 = 15.625 MHz.
C66xx_0: GEL Output: PLL1 Setup... Done.
C66xx_0: GEL Output: PA PLL (PLL3) Setup ...
C66xx_0: GEL Output: PA PLL Setup... Done.
C66xx_0: GEL Output: DDR3 PLL (PLL2) Setup ...
C66xx_0: GEL Output: DDR3 PLL Setup... Done.
C66xx_0: GEL Output: DDR begin (1333 auto)
C66xx_0: GEL Output: XMC Setup ... Done
—————————————————————虚线之间部分循环十次
C66xx_0: GEL Output:
SGMII SERDES has been configured.
C66xx_0: GEL Output: Enabling EDC ...
C66xx_0: GEL Output: L1P error detection logic is enabled.
C66xx_0: GEL Output: L2 error detection/correction logic is enabled.
C66xx_0: GEL Output: MSMC error detection/correction logic is enabled.
C66xx_0: GEL Output: Enabling EDC ...Done
C66xx_0: GEL Output: Configuring CPSW ...
C66xx_0: GEL Output: Configuring CPSW ...Done
C66xx_0: GEL Output: Global Default Setup... Done.
C66xx_0: GEL Output: Invalidate All Cache...
C66xx_0: GEL Output: Invalidate All Cache... Done.
C66xx_0: GEL Output: GEL Reset...
C66xx_0: GEL Output: GEL Reset... Done.
C66xx_0: GEL Output: Disable all EDMA3 interrupts and events.
4． 加载完成后运行
#define SPI_LOOPBACK_TEST 1
#define SPI_NOR_FLASH_TEST 1
#define SPI_EDMA_TEST 1
上面这三个是最初选择的测试项，运行时提示
[C66xx_0] JTAG ID= 0x1009e02f. This is C6678/TCI6608 device, version variant = 1.
DEVSTAT= 0x00018200. big endian, No boot or EMIF16(NOR FLASH) or UART boot, PLL configuration implies the input clock for core is 50MHz.
SmartReflex VID= 50, required core voltage= 1.020V.
Die ID= 0x01013011, 0x04043ad2, 0x00000000, 0x7b160021
Device speed grade = 1000MHz.
Enable Exception handling...
Initialize DSP main clock = 156.25MHz/5x32 = 1000MHz
Initialize DDR speed = 156.25MHzx/15x128 = 1333.333MTS
ERROR: SPI format 1 speed higher than 66 MHz!
SPI internal loopback test at 858993MHz...
SPI loopback test passed with data pattern 0x0. Throughput= 20Mbps
SPI loopback test failed at word 0: TX 0xffff, RX 0x0
SPI loopback test failed at word 0: TX 0x5555, RX 0x0
此时发现loopback的时钟设置超过66MHz了，于是看了下在
***.dataFormat[1]= &loopbackDataFormat;
之后spiCfg.dataFormat[1]->clockSpeedKHz内并没有写入正确值（后来发现loopbackDataFormat内所有值都没正确赋给spiCfg.dataFormat[1]）。这里不知道为什么。
没办法只能将SPI_Init()函数里面的三个结构体数组赋值处单独按DataFormat内容写一遍，如下：
***.dataFormat[0]= &FlashDataFormat;
***.dataFormat[0]->delayBetweenTrans_ns = 0;
***.dataFormat[0]->ShifDirection = SPI_MSB_SHIFT_FIRST;
***.dataFormat[0]->disable_CS_timing = 0;
***.dataFormat[0]->clockPolarity = SPI_CLOCK_LOW_INACTIVE;
***.dataFormat[0]->clockPhase = 1;
***.dataFormat[0]->clockSpeedKHz = 54000;
***.dataFormat[0]->wordLength = 8;
***.dataFormat[1]= &loopbackDataFormat;
***.dataFormat[1]->delayBetweenTrans_ns = 0;
***.dataFormat[1]->ShifDirection = SPI_MSB_SHIFT_FIRST;
***.dataFormat[1]->disable_CS_timing = 1;
***.dataFormat[1]->clockPolarity = SPI_CLOCK_LOW_INACTIVE;
***.dataFormat[1]->clockPhase = 0;
***.dataFormat[1]->clockSpeedKHz = 66000;
***.dataFormat[1]->wordLength = 16;
***.dataFormat[2]= &EdmaDataFormat;
***.dataFormat[2]->delayBetweenTrans_ns = 0;
***.dataFormat[2]->ShifDirection = SPI_MSB_SHIFT_FIRST;
***.dataFormat[2]->disable_CS_timing = 1;
***.dataFormat[2]->clockPolarity = SPI_CLOCK_LOW_INACTIVE;
***.dataFormat[2]->clockPhase = 0;
***.dataFormat[2]->clockSpeedKHz = 66000;
***.dataFormat[2]->wordLength = 16;
这回结构体数组内容对了，运行下：
SPI internal loopback test at 66MHz...
SPI loopback test passed with data pattern 0x0. Throughput= 20Mbps
SPI loopback test failed at word 0: TX 0xffff, RX 0x0
SPI loopback test failed at word 0: TX 0x5555, RX 0x0
SPI interrupt test: manually generate RX overrun error…
Loopback failed然后停住不动了。
5． 之后把EDMA测试去掉
#define SPI_LOOPBACK_TEST 1
#define SPI_NOR_FLASH_TEST 1
#define SPI_EDMA_TEST 0
运行结果loopback通过了。。。什么情况
SPI internal loopback test at 66MHz...
SPI loopback test passed with data pattern 0x0. Throughput= 28Mbps
SPI loopback test passed with data pattern 0xffff. Throughput= 28Mbps
SPI loopback test passed with data pattern 0x5555. Throughput= 28Mbps
SPI interrupt test: manually generate RX overrun error...
但是中断测试那里又停住了。。。
6． 为了测试SPI Flash，把loopback测试里面的SPI_interrupt_test();屏蔽掉，再运行。
SPI internal loopback test at 66MHz...
SPI loopback test passed with data pattern 0x0. Throughput= 28Mbps
SPI loopback test passed with data pattern 0xffff. Throughput= 28Mbps
SPI loopback test passed with data pattern 0x5555. Throughput= 28Mbps
SPI NOR FLASH test at 30MHz...
Read SPI NOR FLASH ID = 0x48 0x17 0xa2
Save data from 0xf00000 to 0xf40000.
erase failed at 0xf00000
loopback过去了， NOR FLASH的ID读取错误，正确值应该为0x20 0xbb 0x18
降低时钟频率，再试：
SPI internal loopback test at 66MHz...
SPI loopback test passed with data pattern 0x0. Throughput= 28Mbps
SPI loopback test passed with data pattern 0xffff. Throughput= 28Mbps
SPI loopback test passed with data pattern 0x5555. Throughput= 28Mbps
SPI NOR FLASH test at 1MHz...
Read SPI NOR FLASH ID = 0xa1 0x11 0x9c 这里值不同了
Save data from 0xf00000 to 0xf40000.
erase failed at 0xf00000
有下面几个疑问：
（1）程序加载的时候提示的
C66xx_0: GEL Output: DDR3 memory test... Started
C66xx_0: GEL Output: DDR3 memory test... Failed
C66xx_0: GEL Output: PLL and DDR Initialization failed ...
是什么意思，leveling没成功？我是5片4Gbit的DDR3，是不是哪里设置不对。ECC不用的话DDR3焊5片的话会有影响吗？我的DDR3型号为MT41K256M16HA-107IT:E
（2）EDMA_TEST对loopback_TEST有影响吗，同时进行的时候LOOPBACK不成功是什么原因。
（3）***.dataFormat[0] = &FlashDataFormat;赋值不成功原因是什么？
（4）NOR FLASH的ID读取错误，找了半天不知道什么原因啊。根DDR3会有关系吗？
NOR FLASH型号与开发板不同，是N25Q128A11ESF40F，需要修改哪里吗？
C比较弱，读程序比较吃力，希望高手帮分析下。
