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用MDMA搬运数据,目的把L1里面的代码搬运到外部SDRAM。我用MDMA时发现只能搬运0x5000个32位的代码数,多一点*pMDMA_D0_IRQ_STATUS都会报错,究竟是什么原因呢?我试图分开几次搬运但还是报错。。
附带Mdma初始化代码:
*pMDMA_S0_PERIPHERAL_MAP = 0x1040;
*pMDMA_D0_PERIPHERAL_MAP = 0x1040;
*pMDMA_S0_CURR_DESC_PTR = &c;
*pMDMA_D0_CURR_DESC_PTR = &d;
*pMDMA_S0_CONFIG = 0x4529;
*pMDMA_D0_CONFIG = 0x452B;
我用的是descriptor array形式传出数据的。。
c=0x0000,0xffa0,0x4529,0x5000,0x0004,0x0000,0xff80,0x4529,0x2000,0x0004,0x0000,0xff90,0x4529,0x2000,0x0004,0x0000,0xffaa,0x0528,0xffff,0x0004
d=0x4000,0x0000,0x452b,0x5000,0x0004,0xc000,0x0000,0x452b,0x2000,0x0004,0x4000,0x0001,0x452b,0x2000,0x0004,0x4000,0x000a,0x052a,0xffff,0x0004 |
阿莫论坛20周年了!感谢大家的支持与爱护!!
一只鸟敢站在脆弱的枝条上歇脚,它依仗的不是枝条不会断,而是自己有翅膀,会飞。
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