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PDI NVM enable is fast enough that bare polling is enough without a fixed delay in between each attempt. Make sure the USART transmitter is enabled explicitly when the USART is configured, so that repeated attempts to re-enter PDI mode don't fail due to TXEN not being set.

This commit is contained in:
Dean Camera 2009-12-11 04:56:52 +00:00
parent 66201a05e9
commit 33a46b243a
2 changed files with 6 additions and 6 deletions
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4
Projects/AVRISP/Lib/PDIProtocol.c
View File

@ -115,11 +115,9 @@ static void PDIProtocol_EnterXPROGMode(void)
PDITarget_SendByte(PDI_NVMENABLE_KEY[i - 1]);
/* Poll the STATUS register to check to see if NVM access has been enabled */
uint8_t NVMAttemptsRemaining = 150;
uint8_t NVMAttemptsRemaining = 255;
while (NVMAttemptsRemaining)
{
_delay_ms(1);
PDITarget_SendByte(PDI_CMD_LDCS | PD_STATUS_REG);
if (PDITarget_ReceiveByte() & PDI_STATUS_NVM)
break;

8
Projects/AVRISP/Lib/PDITarget.c
View File

@ -173,6 +173,7 @@ void PDITarget_EnableTargetPDI(void)
/* Set up the synchronous USART for XMEGA communications -
8 data bits, even parity, 2 stop bits */
UBRR1 = 10;
UCSR1B = (1 << TXEN1);
UCSR1C = (1 << UMSEL10) | (1 << UPM11) | (1 << USBS1) | (1 << UCSZ11) | (1 << UCSZ10) | (1 << UCPOL1);
/* Send two BREAKs of 12 bits each to enable PDI interface (need at least 16 idle bits) */
@ -182,9 +183,10 @@ void PDITarget_EnableTargetPDI(void)
void PDITarget_DisableTargetPDI(void)
{
/* Turn of receiver and transmitter of the USART, clear settings */
UCSR1B = 0;
UCSR1C = 0;
/* Turn off receiver and transmitter of the USART, clear settings */
UCSR1A |= (1 << TXC1) | (1 << RXC1);
UCSR1B = 0;
UCSR1C = 0;
/* Set all USART lines as input, tristate */
DDRD &= ~((1 << 5) | (1 << 3));