Disabling the doubling SCK clock speed after PE fixes the read errors . Need to investigate more . Fix #22

Author: dioannidis

firmware/isp.c

@@ -202,15 +202,15 @@ uchar ispEnterProgrammingMode() {
 
             if (check == 0x53) {
                 /* Don't bump up speed to 3 Mhz */
-                if(prog_sck < USBASP_ISP_SCK_1500){
+                // if(prog_sck < USBASP_ISP_SCK_1500){
 
-                /* bump up speed now that programming mode is enabled */
-                /* http://nerdralph.blogspot.com/2020/09/recording-reset-pin.html */
-                    spiHWdisable();
-                    ispSetSCKOption(prog_sck + 1);
-                    if (ispTransmit == ispTransmit_hw) spiHWenable();
+                // /* bump up speed now that programming mode is enabled */
+                // /* http://nerdralph.blogspot.com/2020/09/recording-reset-pin.html */
+                    // spiHWdisable();
+                    // ispSetSCKOption(prog_sck + 1);
+                    // if (ispTransmit == ispTransmit_hw) spiHWenable();
 
-                }
+                // }
                 return 0;
             }
 
@@ -225,8 +225,9 @@ uchar ispEnterProgrammingMode() {
             spiTx(0);
             check = spiTx(0);
 
-            if (check == 0x69) 
+            if (check == 0x69){ 
                 return 0;
+            }
 
         } while (--tries);