Use the PDI REPEAT instruction in the PDI programmer code to reduce protocol overhead...

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

diff --git a/Projects/AVRISP/Lib/PDITarget.c b/Projects/AVRISP/Lib/PDITarget.c
index e1b77f0..9f2bea8 100644 (file)
--- a/Projects/AVRISP/Lib/PDITarget.c
+++ b/Projects/AVRISP/Lib/PDITarget.c
@@ -44,7 +44,7 @@ volatile bool     IsSending;
 volatile uint16_t SoftUSART_Data;\r
 volatile uint8_t  SoftUSART_BitCount;\r
 \r
-ISR(TIMER0_COMPA_vect, ISR_BLOCK)\r
+ISR(TIMER1_COMPA_vect, ISR_BLOCK)\r
 {\r
        /* Toggle CLOCK pin in a single cycle (see AVR datasheet) */\r
        BITBANG_PDICLOCK_PIN |= BITBANG_PDICLOCK_MASK;\r
@@ -112,11 +112,10 @@ void PDITarget_EnableTargetPDI(void)
        asm volatile ("NOP"::);\r
        asm volatile ("NOP"::);\r
 \r
-       /* Fire timer compare ISR every 50 cycles to manage the software USART */\r
-       OCR0A   = 50;\r
-       TCCR0A  = (1 << WGM01);\r
-       TCCR0B  = (1 << CS00);\r
-       TIMSK0  = (1 << OCIE0A);\r
+       /* Fire timer compare ISR every 100 cycles to manage the software USART */\r
+       OCR1A   = 100;\r
+       TCCR1B  = (1 << WGM12) | (1 << CS10);\r
+       TIMSK1  = (1 << OCIE1A);\r
        \r
        PDITarget_SendBreak();\r
        PDITarget_SendBreak();\r
@@ -275,4 +274,20 @@ void PDITarget_SendBreak(void)
 #endif\r
 }\r
 \r
+bool PDITarget_WaitWhileNVMBusBusy(void)\r
+{\r
+       TCNT0 = 0;\r
+\r
+       /* Poll the STATUS register to check to see if NVM access has been enabled */\r
+       while (TCNT0 < PDI_NVM_TIMEOUT_MS)\r
+       {\r
+               /* Send the LDCS command to read the PDI STATUS register to see the NVM bus is active */\r
+               PDITarget_SendByte(PDI_CMD_LDCS | PDI_STATUS_REG);\r
+               if (PDITarget_ReceiveByte() & PDI_STATUS_NVM)\r
+                 return true;\r
+       }\r
+       \r
+       return false;\r
+}\r
+\r
 #endif\r