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Change over AVRISP project to have both hardware USART and software USART modes for the PDI protocol, when enabled. Fix up PDI initialisation routines.

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This commit is contained in:
Dean Camera 2009-12-11 00:03:10 +00:00
parent 7aecda6fda
commit 42cfd15793
5 changed files with 204 additions and 111 deletions
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27
Projects/AVRISP/Lib/PDIProtocol.c
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@ -104,18 +104,13 @@ static void PDIProtocol_EnterXPROGMode(void)
Endpoint_ClearOUT();
Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
PDIDATA_LINE_DDR |= PDIDATA_LINE_MASK;
PDICLOCK_LINE_DDR |= PDICLOCK_LINE_MASK;
/* Must hold DATA line high for at least 90nS to enable PDI interface */
PDIDATA_LINE_PORT |= PDIDATA_LINE_MASK;
asm volatile ("NOP"::);
asm volatile ("NOP"::);
/* Toggle CLOCK line 16 times within 100uS of the original 90nS timeout to keep PDI interface enabled */
for (uint8_t i = 0; i < 16; i++)
TOGGLE_PDI_CLOCK;
/* Enable PDI programming mode with the attached target */
PDITarget_EnableTargetPDI();
/* Store the RESET ket into the RESET PDI register to complete the handshake */
PDITarget_SendByte(PDI_CMD_STCS | PD_RESET_REG);
PDITarget_SendByte(PDI_RESET_KEY);
/* 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++)
@ -140,14 +135,8 @@ static void PDIProtocol_LeaveXPROGMode(void)
Endpoint_ClearOUT();
Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
/* Set DATA and CLOCK lines to inputs */
PDIDATA_LINE_DDR &= ~PDIDATA_LINE_MASK;
PDICLOCK_LINE_DDR &= ~PDICLOCK_LINE_MASK;
/* Tristate DATA and CLOCK lines */
PDIDATA_LINE_PORT &= ~PDIDATA_LINE_MASK;
PDICLOCK_LINE_PORT &= ~PDICLOCK_LINE_MASK;
PDITarget_DisableTargetPDI();
Endpoint_Write_Byte(CMD_XPROG);
Endpoint_Write_Byte(XPRG_CMD_LEAVE_PROGMODE);
Endpoint_Write_Byte(XPRG_ERR_OK);