Fix PDI code - must send NVM enable key least significant byte first, need to make...

[pub/USBasp.git] / Projects / AVRISP / Lib / PDIProtocol.c

diff --git a/Projects/AVRISP/Lib/PDIProtocol.c b/Projects/AVRISP/Lib/PDIProtocol.c
index 28bd540..32a74c5 100644 (file)
--- a/Projects/AVRISP/Lib/PDIProtocol.c
+++ b/Projects/AVRISP/Lib/PDIProtocol.c
@@ -111,18 +111,20 @@ static void PDIProtocol_EnterXPROGMode(void)
 \r
        /* Enable access to the XPROG NVM bus by sending the documented NVM access key to the device */\r
        PDITarget_SendByte(PDI_CMD_KEY);        \r
-       for (uint8_t i = 0; i < sizeof(PDI_NVMENABLE_KEY); i++)\r
-         PDITarget_SendByte(PDI_NVMENABLE_KEY[i]);\r
+       for (uint8_t i = sizeof(PDI_NVMENABLE_KEY); i > 0; i--)\r
+         PDITarget_SendByte(PDI_NVMENABLE_KEY[i - 1]);\r
 \r
        /* Poll the STATUS register to check to see if NVM access has been enabled */\r
-       uint8_t NVMAttemptsRemaining = 200;\r
-       while (NVMAttemptsRemaining--)\r
+       uint8_t NVMAttemptsRemaining = 150;\r
+       while (NVMAttemptsRemaining)\r
        {\r
                _delay_ms(1);\r
-               PDITarget_SendByte(PDI_CMD_LDCS | PD_STATUS_REG);\r
 \r
+               PDITarget_SendByte(PDI_CMD_LDCS | PD_STATUS_REG);\r
                if (PDITarget_ReceiveByte() & PDI_STATUS_NVM)\r
                  break;\r
+\r
+               NVMAttemptsRemaining--;\r
        }\r
        \r
        Endpoint_Write_Byte(CMD_XPROG);\r