/members-area/personalblogs/b/blog/posts/talk-spi-to-eeprom-with-hercules-launchpad---part-2-circuit-and-test-bedMy Peruvian mate martinvalencia and I purchased a set of 25LC256 SPI serial EEPROM chips.Our plan was to get them working with the Texas Instruments Hercules LaunchPad MK II .That was back in January. And then we stalled.Martin has restarted the exercen-USTelligent Community 12https://community.element14.com/members-area/personalblogs/b/blog/posts/talk-spi-to-eeprom-with-hercules-launchpad---part-2-circuit-and-test-bedSun, 10 May 2015 22:22:09 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:b5a24e33-b64f-4b39-9701-3ec49396d7d5Jan Cumps1<p>I think I&#39;m doing the right thing, but the eeprom doesn&#39;t reply (1: set write enable, 2: write data <strong><em>0xAA</em></strong>, 3: set write disable, 4: read data <em><strong>0x00</strong></em> <span>[View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-b5a24e33-b64f-4b39-9701-3ec49396d7d5/7282.contentimage_5F00_2.png:16:16]</span> )</p><p>&nbsp;</p><p><span>[View:/resized-image/__size/1200x900/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-b5a24e33-b64f-4b39-9701-3ec49396d7d5/5148.contentimage_5F00_179041.png:1200:900]</span></p><p>&nbsp;</p><p>I must be doing the wrong thing then ...</p><p>Back to the spec.</p><img src="https://community.element14.com/aggbug?PostID=20766&AppID=293&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/members-area/personalblogs/b/blog/posts/talk-spi-to-eeprom-with-hercules-launchpad---part-2-circuit-and-test-bedSat, 09 May 2015 16:57:16 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:b5a24e33-b64f-4b39-9701-3ec49396d7d5Jan Cumps0<p>It&#39;s getting better. I believe that there are still issues with CS_HOLD, but were moving...</p><p><span>[View:/resized-image/__size/620x287/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-b5a24e33-b64f-4b39-9701-3ec49396d7d5/5226.contentimage_5F00_179040.png:620:287]</span></p><img src="https://community.element14.com/aggbug?PostID=20766&AppID=293&AppType=Weblog&ContentType=0" width="1" height="1">https://community.element14.com/members-area/personalblogs/b/blog/posts/talk-spi-to-eeprom-with-hercules-launchpad---part-2-circuit-and-test-bedSat, 09 May 2015 16:20:21 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:b5a24e33-b64f-4b39-9701-3ec49396d7d5Jan Cumps0<p>Our first tries look promising,&nbsp; but we don&#39;t get a CS yet...</p><p>&nbsp;</p><p><span>[View:/resized-image/__size/620x283/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-b5a24e33-b64f-4b39-9701-3ec49396d7d5/1351.contentimage_5F00_179039.png:620:283]</span></p><img src="https://community.element14.com/aggbug?PostID=20766&AppID=293&AppType=Weblog&ContentType=0" width="1" height="1">