AD7771 MEMMAP_CRC_ERR problem

Question

Hello, 
 I use an AD7771 in SPI control mode and read the output data over DOUT0-DOUT3 pins. 
 
 ADC data seem to make sense, however, in the header ALERT bit is always set to 1. 
 
 The MEMMAP_CRC_ERR bit in GEN_ERR_REG_1 register seems to be set to 1 after I do the initialisation. 
 Here is my Memory Map after reset on the left side and after initialisation on the right. 
 
 The MEMMAP_CRC_ERR disappears if I set bit AD7779_MEMMAP_CRC_TEST_EN in AD7779_REG_GEN_ERR_REG_1_EN register to 0 during the initialisation. 
 I tried the same with a brand new AD7771FMCZ board to no avail. 
 What am I doing wrong? Could you please help me? 
 
 Thanks in advance, 
 Dusan 
 
 Hardware in use: EVAL-AD7771FMCZ (Evaluation board for AD7771) and NUCLEO F429IZ

sasaruru · Accepted Answer

Hi Lluis 
 I recently took over this project from Dusan. Thanks to your final idea, I could find out, what our problem is. We didn't serve a correct "Channel Select" signal to the ADC board. In fact, the level of this signal was always low. So the ADC board was selected, but didn't received any edges and this has triggered the MEMMAP_CRC_ERR flag. Beside this flag, all registers were written correctly. 
 With a correct "Channel Select" signal, the error flag disappeared. 
 Thanks a lot for your persistent help! Cheers Samuel

Lluis · Answer

Hi dusan, Ok, checking I understood again: no matter how many registers you write nor which of them, MEMMAP_CRC_ERR will assert after the last register write operation? None of the previous register write asserted it. Have you tried opearting this two board with the software we provide? In order to see if it is a device issue or a consequence of your code. I have just run one board, with the eval board software. On power up, this flag is not asserted. I wrote the very same registers as you did, and I never got such flags asserted. Fullscreen after initialization.xml Download 7432e7d8d769c34138b89fa06a82bc83d41df2b2 CH0_CONFIG 0x0 1813cbd12e58e30fdeb423cd9146221caa2410af CH1_CONFIG 0x0 b4e91572e0702b0183b4fb546abcda98e7b4dc18 CH2_CONFIG 0x0 589634982ed399105dc8c8cf37cc8520767e7438 CH3_CONFIG 0x0 6ef28bab2c66f74de8f908926611f7823136a04b CH4_CONFIG 0x0 3dcef572463fc18cb7492ab5be6ff08c057f00ea CH5_CONFIG 0x0 eb728cc2a7c5e0c797b7e2f9ae5a96aade66cdfc CH6_CONFIG 0x0 eab8198bf640769f4c98e19547f019baa15b3e14 CH7_CONFIG 0x0 303d2047e5b74d93553e151a31d2667cb97fd5f4 CH_DISABLE 0x0 5133c5450c57f7d269c8df03f8307caa61e2c555 CH0_SYNC_OFFSET 0x0 cd76d82c9f850b44389bea527f76507e0d8036d5 CH1_SYNC_OFFSET 0x0 10793a3cadbbc630171959602043dd4db27ab5eb CH2_SYNC_OFFSET 0x0 77aa8ca0ddfecb23e0001b9ac6905a1fb850d7b9 CH3_SYNC_OFFSET 0x0 2d0fef964d30963f3479af5c44b7c559fb8f6685 CH4_SYNC_OFFSET 0x0 e58acb0e315f509be03fbb7422ba7b1c49cafa9d CH5_SYNC_OFFSET 0x0 24e13dfd005cfa1b1c6c27cbe2e8e99a7059dee4 CH6_SYNC_OFFSET 0x0 ae3f6073a6e6d371f893d95d666c84c91a117134 CH7_SYNC_OFFSET 0x0 373bf64b8a689335a08b60b68dfcf8881cfc8b8f GENERAL_USER_CONFIG_1 0x74 c61974e113903f27b7946a2cbbd1069ada946130 GENERAL_USER_CONFIG_2 0x9 e1daeced817bab8152dd33df8f7c869d91717809 GENERAL_USER_CONFIG_3 0x80 1533d0c201741294009cd47b0db6f1cc587e3a5e DOUT_FORMAT 0x20 e7be8a9a3d2d45bbe6f9fd137e9172bb86f965d7 ADC_MUX_CONFIG 0x0 d62b8ad9a927efd55d4fb158371fcc89528fa7d5 GLOBAL_MUX_CONFIG 0x0 2b431794de39145b961babf6d6d08436bd29d18b GPIO_CONFIG 0x0 83ce98072938d6c1024290b45469b60a2a1f261f GPIO_DATA 0x0 682e43da29f60894349161a3778bcda24e45f5ca BUFFER_CONFIG_1 0x38 d0d15bc70ec134af44f11b5510c4529e8642077c BUFFER_CONFIG_2 0xC0 dc58e48c359824dd237cc763738564b5e1614dc0 BUFFER_CONFIG_3 0x0 aa987a2af95caea79dae6cb94167ddc63598e9f6 CH0_OFFSET_UPPER_BYTE 0x0 e885955ecfb6a85934684777f31333571c0df177 CH0_OFFSET_MID_BYTE 0x0 346a304b8f5bbf4b4b5a5d9828ba714ac3ba5d40 CH0_OFFSET_LOWER_BYTE 0x0 098a44ae4dd3f65e1e76366876819ee7569daa04 CH0_GAIN_UPPER_BYTE 0x55 64a25aadc1f012aa8ed70c49d63bdf46b8cd8e8f CH0_GAIN_MID_BYTE 0x52 6d8b313555c8e1327d2f45263c44041c523a08f5 CH0_GAIN_LOWER_BYTE 0xD5 98661f26f3be9bbcfb1da84b59486374084c1313 CH1_OFFSET_UPPER_BYTE 0x0 08e08ceb8d25c3f0c3d6e6d23539c50e342d7501 CH1_OFFSET_MID_BYTE 0x0 ac47f0f009319da9d8a8e020d9538d34f07940fe CH1_OFFSET_LOWER_BYTE 0x0 b1beea222beb9fdc405a0145af2a921d4384a47b CH1_GAIN_UPPER_BYTE 0x55 2e18ab97e487218677dd39c8091f298357ba19ea CH1_GAIN_MID_BYTE 0x49 59b04f0b97f2835fc9b2297193a48ae3540785a9 CH1_GAIN_LOWER_BYTE 0xB5 21c6fce3c3743a56809d9edd193e12926f202381 CH2_OFFSET_UPPER_BYTE 0x0 f61546d1288bac910c725ae5ab2bf006c20bd232 CH2_OFFSET_MID_BYTE 0x0 56183509c12b475db1625686db257be119f48804 CH2_OFFSET_LOWER_BYTE 0x0 af5adac070cc78dc9c32a4e882dac51553426df4 CH2_GAIN_UPPER_BYTE 0x55 07bd552761e71a1e51ebd8adcec643791981a8ff CH2_GAIN_MID_BYTE 0x53 e544fa381423710443c4c79f39c38cbec9e81ada CH2_GAIN_LOWER_BYTE 0xD5 12213aa8646540cd15c58a1604300b8e53fba8ae CH3_OFFSET_UPPER_BYTE 0x0 38170fdcb2323eb54aa338e6699b6e03d298248f CH3_OFFSET_MID_BYTE 0x0 8eacbe3080ea497e4bfa27c1149b6ef7ae0adb73 CH3_OFFSET_LOWER_BYTE 0x0 cb4c32b44cf4588642aca37fa9fb408a38311bbc CH3_GAIN_UPPER_BYTE 0x55 f7656ad04ee474fd5d0e3db9db8e753da5cb7c63 CH3_GAIN_MID_BYTE 0x54 8f85811a5cbce6e5fa9598b4356ffde77115f65e CH3_GAIN_LOWER_BYTE 0xD5 2a68151d2a082ca53fa46cfcdcb6c89e2b62cbb3 CH4_OFFSET_UPPER_BYTE 0x0 20efccb423ec768f7f3b9124ebc647d407670863 CH4_OFFSET_MID_BYTE 0x0 c8a4e37aff371182c622091fa5420d19b3612d07 CH4_OFFSET_LOWER_BYTE 0x0 5dd47161105413147f59341038147a6e9f5798d2 CH4_GAIN_UPPER_BYTE 0x55 00aac0e044a654ffafeee06b114f40aad151535f CH4_GAIN_MID_BYTE 0x4E 3bf08cc901c1aba6c0ebf349ef5f4247f1e2312d CH4_GAIN_LOWER_BYTE 0x35 ec43ba3188100bd09b218b70124ca25ad0924d13 CH5_OFFSET_UPPER_BYTE 0x0 fccf7185bb3a8a0b4bd088906c51c4c20857e469 CH5_OFFSET_MID_BYTE 0x0 05201892fe7643dfd523a9dc2748bdb0fcd38b1d CH5_OFFSET_LOWER_BYTE 0x0 1a1a2618f955233e9fe453c7e9909e9b17c22aab CH5_GAIN_UPPER_BYTE 0x55 402f2a6cea3682e553cc80b19871ab421c933a75 CH5_GAIN_MID_BYTE 0x50 3f2964eb2e92315bfaf885472a35a3627809958a CH5_GAIN_LOWER_BYTE 0xA5 0c15a4d4298dbd483f982aad607a3c6edd060bad CH6_OFFSET_UPPER_BYTE 0x0 85eaf81a3684aff6c5338f3fd24a3484898d59b9 CH6_OFFSET_MID_BYTE 0x0 ef2d85d3c3c3ed931c79ea3ccb8fbc0afa655bbe CH6_OFFSET_LOWER_BYTE 0x0 163fa0b414e3e23cd4cef403a8966d8bc34fdb7b CH6_GAIN_UPPER_BYTE 0x55 ee3e118f52ece83acf8d3032909347bc08bff62c CH6_GAIN_MID_BYTE 0x55 1a71541f69b338be07ec0d199b2ba6fb67c2e460 CH6_GAIN_LOWER_BYTE 0x55 2c4b790d1364050db75210f2639fbe272da64e7b CH7_OFFSET_UPPER_BYTE 0x0 622eefbe0d2ff54b554f0da479175bfd7ebcbf75 CH7_OFFSET_MID_BYTE 0x0 613d5c49a43f4b2652a10f6403d9a54aaaf10cf3 CH7_OFFSET_LOWER_BYTE 0x0 120040d11a92552bf2cbb244c33e2ac8bf36d947 CH7_GAIN_UPPER_BYTE 0x55 3e8a30929175641ba5a0cae1eaa3b1e5d2f3db1c CH7_GAIN_MID_BYTE 0x4E c3d28d0721438e47e5dcc100c0439b1307b09663 CH7_GAIN_LOWER_BYTE 0x35 92934683303c4ca0e9402dbe4b06ec67a857335a CH0_ERR_REG 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0x0 d1e559cf2085b63c6c947e969684d89279167545 STATUS_REG_2 0x0 268a38c0b4e350083ac03a24e74cc67c465d95cc STATUS_REG_3 0x10 adf873a3fb305289edf288fe7f8fd38f74f16b78 SRC_N_MSB 0x0 699ca40a12119a6c521b1fac5c3049fabe8c5657 SRC_N_LSB 0x80 2da1ec5b6a448fd373f353864dac9faed7b09967 SRC_IF_MSB 0x0 9b64dab97567699bbea66a9fd46c2cd8be487052 SRC_IF_LSB 0x0 fba2e582a38d4ffebbff6f471f1bea453a369455 SRC_UPDATE 0x0 Fullscreen on power up.xml Download 7432e7d8d769c34138b89fa06a82bc83d41df2b2 CH0_CONFIG 0x0 1813cbd12e58e30fdeb423cd9146221caa2410af CH1_CONFIG 0x0 b4e91572e0702b0183b4fb546abcda98e7b4dc18 CH2_CONFIG 0x0 589634982ed399105dc8c8cf37cc8520767e7438 CH3_CONFIG 0x0 6ef28bab2c66f74de8f908926611f7823136a04b CH4_CONFIG 0x0 3dcef572463fc18cb7492ab5be6ff08c057f00ea CH5_CONFIG 0x0 eb728cc2a7c5e0c797b7e2f9ae5a96aade66cdfc CH6_CONFIG 0x0 eab8198bf640769f4c98e19547f019baa15b3e14 CH7_CONFIG 0x0 303d2047e5b74d93553e151a31d2667cb97fd5f4 CH_DISABLE 0x0 5133c5450c57f7d269c8df03f8307caa61e2c555 CH0_SYNC_OFFSET 0x0 cd76d82c9f850b44389bea527f76507e0d8036d5 CH1_SYNC_OFFSET 0x0 10793a3cadbbc630171959602043dd4db27ab5eb CH2_SYNC_OFFSET 0x0 77aa8ca0ddfecb23e0001b9ac6905a1fb850d7b9 CH3_SYNC_OFFSET 0x0 2d0fef964d30963f3479af5c44b7c559fb8f6685 CH4_SYNC_OFFSET 0x0 e58acb0e315f509be03fbb7422ba7b1c49cafa9d CH5_SYNC_OFFSET 0x0 24e13dfd005cfa1b1c6c27cbe2e8e99a7059dee4 CH6_SYNC_OFFSET 0x0 ae3f6073a6e6d371f893d95d666c84c91a117134 CH7_SYNC_OFFSET 0x0 373bf64b8a689335a08b60b68dfcf8881cfc8b8f GENERAL_USER_CONFIG_1 0x24 c61974e113903f27b7946a2cbbd1069ada946130 GENERAL_USER_CONFIG_2 0x9 e1daeced817bab8152dd33df8f7c869d91717809 GENERAL_USER_CONFIG_3 0x80 1533d0c201741294009cd47b0db6f1cc587e3a5e DOUT_FORMAT 0x20 e7be8a9a3d2d45bbe6f9fd137e9172bb86f965d7 ADC_MUX_CONFIG 0x0 d62b8ad9a927efd55d4fb158371fcc89528fa7d5 GLOBAL_MUX_CONFIG 0x0 2b431794de39145b961babf6d6d08436bd29d18b GPIO_CONFIG 0x0 83ce98072938d6c1024290b45469b60a2a1f261f GPIO_DATA 0x0 682e43da29f60894349161a3778bcda24e45f5ca BUFFER_CONFIG_1 0x38 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AD7771 MEMMAP_CRC_ERR problem

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