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@@ -56,7 +56,7 @@ module fpga_lf(
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Communication between ARM / FPGA is done inside armsrc/fpgaloader.c see: function FpgaSendCommand()
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Send 16 bit command / data pair to FPGA
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The bit format is: C3 C2 C1 C0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
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where
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where
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C is 4bit command
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D is 12bit data
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@@ -83,11 +83,11 @@ module fpga_lf(
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Each one of this major modes can have options. Currently these two major modes uses options.
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- FPGA_MAJOR_MODE_LF_READER
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- FPGA_MAJOR_MODE_LF_EDGE_DETECT
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FPGA_MAJOR_MODE_LF_READER
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-------------------------------------
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lf_field = 1bit (FPGA_LF_ADC_READER_FIELD)
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You can send FPGA_CMD_SET_DIVISOR to set with FREQUENCY the fpga should sample at
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divisor = 8bits shift_reg[7:0]
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@@ -101,7 +101,7 @@ module fpga_lf(
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conf_word 12bits
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conf_word[7:5] = 3bit major mode.
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conf_word[0] = 1bit lf_field
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conf_word[0] = 1bit lf_field
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conf_word[1] = 1bit lf_ed_toggle_mode
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conf_word[7:0] = 8bit divisor
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conf_word[7:0] = 8bit threshold
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@@ -110,7 +110,7 @@ module fpga_lf(
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bit | 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
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-----+-------------------------------------------
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cmd | x x x x
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major| x x x
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major| x x x
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opt | x x
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divi | x x x x x x x x
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thres| x x x x x x x x
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