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readme update

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pull/3/head
Emard 7 years ago
parent 78e4a8ddbb
commit 272eda6bb4
1 changed files with 3 additions and 4 deletions
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README.md
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@ -135,12 +135,10 @@ Test the prototype.
it is connected to J1_27+ and wrong pullup/pulldown at boot it is connected to J1_27+ and wrong pullup/pulldown at boot
will prevent ESP32 from booting will prevent ESP32 from booting
[x] ESP-32: won't boot when SD connected. Don't solder it at PCB v1.7 [x] ESP-32: won't boot when SD connected. Don't solder it at PCB v1.7
it should be routed differently in newer release It is routed differently in newer release
Here is a possible SD card connection
Arduino->Examples->ESP32->SD_MMC_Test Arduino->Examples->ESP32->SD_MMC_Test
https://github.com/espressif/esp-idf/blob/master/examples/storage/sd_card/README.md https://github.com/espressif/esp-idf/blob/master/examples/storage/sd_card/README.md
move blue LED from GPIO2 to GPIO17 moved blue LED from GPIO2 to GPIO5
[ ] SD card pullup pulldowns (do we need them if FPGA can pullup/pulldown)
[x] I2C resistors increased 470->2.2k [x] I2C resistors increased 470->2.2k
[ ] GPDI series C=100nF to each differential line. [ ] GPDI series C=100nF to each differential line.
[x] reliable shutdown (D11=RED LED, R4=4.7k) [x] reliable shutdown (D11=RED LED, R4=4.7k)
@ -156,3 +154,4 @@ Test the prototype.
[x] move 8 LEDs a bit down and right [x] move 8 LEDs a bit down and right
[x] let SD_CLK go to FPGA clock capable pin: swap SD_CLK and SD_D2 pins [x] let SD_CLK go to FPGA clock capable pin: swap SD_CLK and SD_D2 pins
[x] additional 2 differential lines for US2 [x] additional 2 differential lines for US2
[ ] clear silkscreen mess with Cx under FPGA

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