From f142ad139b12a3827b9bb92b21c4d750dafffc9d Mon Sep 17 00:00:00 2001
From: iceman1001 <iceman@iuse.se>
Date: Mon, 30 Sep 2019 23:18:48 +0200
Subject: [PATCH] chg 'lf cmdread' - clientside checks,  less wait times on
 device

---
 armsrc/lfops.c | 14 +++++++++-----
 client/cmdlf.c |  8 ++++++++
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/armsrc/lfops.c b/armsrc/lfops.c
index e2e8daadf..92c369b76 100644
--- a/armsrc/lfops.c
+++ b/armsrc/lfops.c
@@ -372,16 +372,19 @@ void loadT55xxConfig(void) {
  */
 void ModThenAcquireRawAdcSamples125k(uint32_t delay_off, uint32_t period_0, uint32_t period_1, uint8_t *command) {
 
-    // start timer
-    StartTicks();
+    FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
 
     // use lf config settings
     sample_config *sc = getSamplingConfig();
 
+
     // Make sure the tag is reset
-    FpgaDownloadAndGo(FPGA_BITSTREAM_LF);
     FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-    WaitMS(500);
+
+    // start timer
+    StartTicks();
+
+    WaitMS(100);
 
     // clear read buffer
     BigBuf_Clear_keep_EM();
@@ -389,7 +392,7 @@ void ModThenAcquireRawAdcSamples125k(uint32_t delay_off, uint32_t period_0, uint
     LFSetupFPGAForADC(sc->divisor, true);
 
     // little more time for the tag to fully power up
-    WaitMS(200);
+    WaitMS(20);
 
     // if delay_off = 0 then just bitbang 1 = antenna on 0 = off for respective periods.
     bool bitbang = (delay_off == 0);
@@ -463,6 +466,7 @@ void ModThenAcquireRawAdcSamples125k(uint32_t delay_off, uint32_t period_0, uint
 
     // Turn off antenna
     FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+
     // tell client we are done
     reply_ng(CMD_LF_MOD_THEN_ACQ_RAW_ADC, PM3_SUCCESS, NULL, 0);
 }
diff --git a/client/cmdlf.c b/client/cmdlf.c
index 954973f2c..ea7aada4f 100644
--- a/client/cmdlf.c
+++ b/client/cmdlf.c
@@ -289,6 +289,14 @@ int CmdLFCommandRead(const char *Cmd) {
         }
     }
 
+   // bitbang mode
+   if (payload.delay == 0){
+      if (payload.zeros < 7 || payload.ones < 7) {
+          PrintAndLogEx(WARNING, "Warning periods cannot be less than 7us in bit bang mode");
+          return PM3_EINVARG;
+      }
+   }
+
     //Validations
     if (errors || cmdp == 0)  return usage_lf_cmdread();