/** Handler for the CMD_SET_PARAMETER and CMD_GET_PARAMETER commands from the host, setting or
* getting a device parameter's value from the parameter table.
*
* \param[in] V2Command Issued V2 Protocol command byte from the host
*/
static void V2Protocol_GetSetParam(const uint8_t V2Command)
{
uint8_t ParamID = Endpoint_Read_Byte();
uint8_t ParamValue;
if (V2Command == CMD_SET_PARAMETER)
ParamValue = Endpoint_Read_Byte();
Endpoint_ClearOUT();
Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPNUM);
Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
Endpoint_Write_Byte(V2Command);
uint8_t ParamPrivs = V2Params_GetParameterPrivileges(ParamID);
if ((V2Command == CMD_SET_PARAMETER) && (ParamPrivs & PARAM_PRIV_WRITE))
{
Endpoint_Write_Byte(STATUS_CMD_OK);
V2Params_SetParameterValue(ParamID, ParamValue);
}
else if ((V2Command == CMD_GET_PARAMETER) && (ParamPrivs & PARAM_PRIV_READ))
{
Endpoint_Write_Byte(STATUS_CMD_OK);
Endpoint_Write_Byte(V2Params_GetParameterValue(ParamID));
}
else
{
Endpoint_Write_Byte(STATUS_CMD_FAILED);
}
Endpoint_ClearIN();
}
/** Initializes the appropriate SPI driver (hardware or software, depending on the selected ISP speed) ready for
* communication with the attached target.
*/
void ISPTarget_EnableTargetISP(void)
{
uint8_t SCKDuration = V2Params_GetParameterValue(PARAM_SCK_DURATION);
if (SCKDuration < sizeof(SPIMaskFromSCKDuration))
{
HardwareSPIMode = true;
SPI_Init(pgm_read_byte(&SPIMaskFromSCKDuration[SCKDuration]) | SPI_ORDER_MSB_FIRST |
SPI_SCK_LEAD_RISING | SPI_SAMPLE_LEADING | SPI_MODE_MASTER);
}
else
{
HardwareSPIMode = false;
DDRB |= ((1 << 1) | (1 << 2));
PORTB |= ((1 << 0) | (1 << 3));
ISPTarget_ConfigureSoftwareSPI(SCKDuration);
}
#ifdef SELECT_TPI_MASK
SELECT_TPI_DDR |= SELECT_TPI_MASK;
SELECT_TPI_PORT &= ~SELECT_TPI_PORT;
#endif
}
/** Asserts or deasserts the target's reset line, using the correct polarity as set by the host using a SET PARAM command.
* When not asserted, the line is tristated so as not to interfere with normal device operation.
*
* \param[in] ResetTarget Boolean true when the target should be held in reset, false otherwise
*/
void ISPTarget_ChangeTargetResetLine(const bool ResetTarget)
{
if (ResetTarget)
{
AUX_LINE_DDR |= AUX_LINE_MASK;
if (!(V2Params_GetParameterValue(PARAM_RESET_POLARITY)))
AUX_LINE_PORT |= AUX_LINE_MASK;
}
else
{
AUX_LINE_DDR &= ~AUX_LINE_MASK;
AUX_LINE_PORT &= ~AUX_LINE_MASK;
}
}
/** Asserts or deasserts the target's reset line, using the correct polarity as set by the host using a SET PARAM command.
* When not asserted, the line is tristated so as not to interfere with normal device operation.
*
* \param[in] ResetTarget Boolean true when the target should be held in reset, \c false otherwise
*/
void ISPTarget_ChangeTargetResetLine(const bool ResetTarget)
{
if (ResetTarget)
{
AUX_LINE_DDR |= AUX_LINE_MASK;
if (!(V2Params_GetParameterValue(PARAM_RESET_POLARITY)))
AUX_LINE_PORT |= AUX_LINE_MASK;
else
AUX_LINE_PORT &= ~AUX_LINE_MASK;
minimizer_set_power(true);
}
else
{
minimizer_set_power(false);
AUX_LINE_DDR &= ~AUX_LINE_MASK;
AUX_LINE_PORT &= ~AUX_LINE_MASK;
}
}
/** Initialises the appropriate SPI driver (hardware or software, depending on the selected ISP speed) ready for
* communication with the attached target.
*/
void ISPTarget_Init(void)
{
uint8_t SCKDuration = V2Params_GetParameterValue(PARAM_SCK_DURATION);
if (SCKDuration < sizeof(SPIMaskFromSCKDuration))
{
HardwareSPIMode = true;
SPI_Init(pgm_read_byte(&SPIMaskFromSCKDuration[SCKDuration]) | SPI_ORDER_MSB_FIRST |
SPI_SCK_LEAD_RISING | SPI_SAMPLE_LEADING | SPI_MODE_MASTER);
}
else
{
HardwareSPIMode = false;
DDRB |= ((1 << 1) | (1 << 2));
PORTB |= ((1 << 0) | (1 << 3));
TIMSK1 = (1 << OCIE1A);
OCR1A = pgm_read_word(&TimerCompareFromSCKDuration[SCKDuration - sizeof(SPIMaskFromSCKDuration)]);
}
}