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Fix PDI code - must send NVM enable key least significant byte first, need to make sure Tx and Rx is switched correctly including disabling the output on the Tx line when receiving.

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Dean Camera
2009-12-11 04:04:34 +00:00
parent 7e5966c1a8
commit 66201a05e9
3 changed files with 50 additions and 18 deletions
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Projects/AVRISP/Lib/PDIProtocol.c
+7 -5
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@@ -111,18 +111,20 @@ static void PDIProtocol_EnterXPROGMode(void)
/* Enable access to the XPROG NVM bus by sending the documented NVM access key to the device */
PDITarget_SendByte(PDI_CMD_KEY);
for (uint8_t i = 0; i < sizeof(PDI_NVMENABLE_KEY); i++)
PDITarget_SendByte(PDI_NVMENABLE_KEY[i]);
for (uint8_t i = sizeof(PDI_NVMENABLE_KEY); i > 0; i--)
PDITarget_SendByte(PDI_NVMENABLE_KEY[i - 1]);
/* Poll the STATUS register to check to see if NVM access has been enabled */
uint8_t NVMAttemptsRemaining = 200;
while (NVMAttemptsRemaining--)
uint8_t NVMAttemptsRemaining = 150;
while (NVMAttemptsRemaining)
{
_delay_ms(1);
PDITarget_SendByte(PDI_CMD_LDCS | PD_STATUS_REG);
PDITarget_SendByte(PDI_CMD_LDCS | PD_STATUS_REG);
if (PDITarget_ReceiveByte() & PDI_STATUS_NVM)
break;
NVMAttemptsRemaining--;
}
Endpoint_Write_Byte(CMD_XPROG);