jtag: Sample data input on negative clock edge

Verification is off by 1bit when sampling on the rising edge.
Sampling on the megative edge also seems like a better option in
general.

diff --git a/ecpprog/jtag_tap.c b/ecpprog/jtag_tap.c
index 17f4bfd1c8884fb1c41f0a0b88c52640a3a18ecb..f791bdc981206aeeb43c3be4763ad7c24bd20df7 100644 (file)
--- a/ecpprog/jtag_tap.c
+++ b/ecpprog/jtag_tap.c
@@ -146,7 +146,7 @@ extern struct ftdi_context mpsse_ftdic;
 
 static inline void jtag_pulse_clock_and_read_tdo(bool tms, bool tdi)
 {
-    *ptr++ = MC_DATA_TMS | MC_DATA_IN | MC_DATA_LSB | MC_DATA_BITS | MC_DATA_OCN;
+    *ptr++ = MC_DATA_TMS | MC_DATA_IN | MC_DATA_LSB | MC_DATA_BITS | MC_DATA_OCN | MC_DATA_ICN;
        *ptr++ =  0;        
     *ptr++ = (tdi ? 0x80 : 0) | (tms ? 0x01 : 0);
        rx_cnt++;
@@ -200,7 +200,7 @@ static void jtag_shift_bytes(
        }
        //printf("jtag_shift_bytes(0x%08x,0x%08x,%u,%s);\n",input_data, output_data, data_bits, must_end ? "true" : "false");
        uint32_t byte_count = data_bits / 8;
-       data[0] = MC_DATA_OUT | MC_DATA_IN | MC_DATA_LSB | MC_DATA_OCN;
+       data[0] = MC_DATA_OUT | MC_DATA_IN | MC_DATA_LSB | MC_DATA_OCN | MC_DATA_ICN;
        data[1] = (byte_count - 1); 
        data[2] = (byte_count - 1) >> 8;        
        memcpy(data + 3, input_data, byte_count);
@@ -270,7 +270,7 @@ void jtag_go_to_state(unsigned state)
                }
 
                uint8_t data[3] = { 
-                       MC_DATA_TMS | MC_DATA_LSB | MC_DATA_BITS,
+                       MC_DATA_TMS | MC_DATA_LSB | MC_DATA_BITS | MC_DATA_ICN,
                        5 - 1,
                        0b11111
                };