Fomu: An FPGA in your USB Port
A whirlwind introduction to Fomu; a workshop in three levels
@@ -348,7 +348,12 @@
-->Misleading Datasheets
+
+ What modifications does it have?
- Shorting out two zero-ohm resistors (R7, PU) @@ -649,7 +654,73 @@ $ wishbone-tool --pid 0x5bf0 0x10000000 Value at 10000000: 12345678 $
Adding Hardware
+
+ Technology Library Reference
+// Verilog Instantiation
+SB_RGBA_DRV RGBA_DRIVER (
+.CURREN(ENABLE_CURR),
+.RGBLEDEN(ENABLE_RGBDRV),
+.RGB0PWM(RGB0),
+.RGB1PWM(RGB1),
+.RGB2PWM(RGB2),
+.RGB0(LED0),
+.RGB1(LED1),
+.RGB2(LED2)
+);
+defparam RGBA_DRIVER.CURRENT_MODE = "0b0";
+defparam RGBA_DRIVER.RGB0_CURRENT = "0b111111";
+defparam RGBA_DRIVER.RGB1_CURRENT = "0b111111" ;
+defparam RGBA_DRIVER.RGB2_CURRENT = "0b111111";SBTICETechnologyLibrary201504.pdf page 147
+RGB Block
+class FomuRGB(Module, AutoCSR):
+ def __init__(self, pads):
+ self.output = CSRStorage(3)
+ self.specials += Instance("SB_RGBA_DRV",
+ i_CURREN = 0b1,
+ i_RGBLEDEN = 0b1,
+ i_RGB0PWM = self.output.storage[0],
+ i_RGB1PWM = self.output.storage[1],
+ i_RGB2PWM = self.output.storage[2],
+ o_RGB0 = pads.r,
+ o_RGB1 = pads.g,
+ o_RGB2 = pads.b,
+ p_CURRENT_MODE = "0b1",
+ p_RGB0_CURRENT = "0b000011",
+ p_RGB1_CURRENT = "0b000011",
+ p_RGB2_CURRENT = "0b000011",
+ )Instantiating FomuRGB
+@@ -55,6 +75,10 @@ class BaseSoC(SoCCore):
+ with_ctrl=False,
+ **kwargs)
+
++ # Add the LED driver block
++ led_pads = platform.request("rgb_led")
++ self.submodules.rgb = FomuRGB(led_pads)
++
+ # UP5K has single port RAM....
+ # Use this as CPU RAM.
+ spram_size = 128*1024Interacting with the CSR
+csr_register,rgb_output,0xe0006800,1,rwFrom test/csr.csv