processor expert bug - FlexBus ALE is taking more than one clock

zohargolan — Tue, 10 Mar 2015 16:56:38 GMT

Hi,

I am trying to setup Flexbus using processor expert and I the ALE size is multiple clocks.

the device I am using is mk20fx512vmd12

and I am using Kinetis Design Studio Version: 2.0.0 Eclipse Version: Kepler (4.3.2)

Here is my flexbus init from cpu.c

/* SIM_SCGC7: FLEXBUS=1 */

SIM_SCGC7 |= SIM_SCGC7_FLEXBUS_MASK;

/* Initialization of the ExternalBus module */

/* SIM_SOPT2: FBSL=0 */

SIM_SOPT2 &= (uint32_t)~(uint32_t)(SIM_SOPT2_FBSL(0x03));

/* FB_CSAR0: BA=0xA000,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0 */

FB_CSAR0 = FB_CSAR_BA(0xA000);

/* FB_CSCR0: SWS=0,??=0,??=0,SWSEN=0,EXTS=1,ASET=0,RDAH=0,WRAH=0,WS=0,BLS=1,AA=1,PS=1,BEM=0,BSTR=0,BSTW=0,??=0,??=0,??=0 */

FB_CSCR0 = FB_CSCR_SWS(0x00) |

FB_CSCR_EXTS_MASK |

FB_CSCR_ASET(0x00) |

FB_CSCR_RDAH(0x00) |

FB_CSCR_WRAH(0x00) |

FB_CSCR_WS(0x00) |

FB_CSCR_BLS_MASK |

FB_CSCR_AA_MASK |

FB_CSCR_PS(0x01);

/* FB_CSMR0: BAM=0x0F,??=0,??=0,??=0,??=0,??=0,??=0,??=0,WP=0,??=0,??=0,??=0,??=0,??=0,??=0,??=0,V=1 */

FB_CSMR0 = (FB_CSMR_BAM(0x0F) | FB_CSMR_V_MASK);

/* FB_CSMR1: V=0 */

FB_CSMR1 &= (uint32_t)~(uint32_t)(FB_CSMR_V_MASK);

/* FB_CSMR2: V=0 */

FB_CSMR2 &= (uint32_t)~(uint32_t)(FB_CSMR_V_MASK);

/* FB_CSMR3: V=0 */

FB_CSMR3 &= (uint32_t)~(uint32_t)(FB_CSMR_V_MASK);

/* FB_CSMR4: V=0 */

FB_CSMR4 &= (uint32_t)~(uint32_t)(FB_CSMR_V_MASK);

/* FB_CSMR5: V=0 */

FB_CSMR5 &= (uint32_t)~(uint32_t)(FB_CSMR_V_MASK);

Please advise,

Best regards,

Zohar

Re: processor expert bug - FlexBus ALE is taking more than one clock

Kan_Li — Wed, 11 Mar 2015 06:22:42 GMT

Hi Zohar golan,

I noticed you set EXTS=1, so that might be the root cause, you have to set it as zero to let FB_ALE just asserts for one bus clock cycle, please refer to the following for details.

Hope that helps,

Have a great day,
Kan

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topic Re: processor expert bug - FlexBus ALE is taking more than one clock in Kinetis Microcontrollers

processor expert bug - FlexBus ALE is taking more than one clock

Re: processor expert bug - FlexBus ALE is taking more than one clock