diff options
Diffstat (limited to 'Projects/AVRISP-MKII/Lib/ISP/ISPTarget.c')
| -rw-r--r-- | Projects/AVRISP-MKII/Lib/ISP/ISPTarget.c | 49 |
1 files changed, 25 insertions, 24 deletions
diff --git a/Projects/AVRISP-MKII/Lib/ISP/ISPTarget.c b/Projects/AVRISP-MKII/Lib/ISP/ISPTarget.c index d7c6882cd..9a74aabb2 100644 --- a/Projects/AVRISP-MKII/Lib/ISP/ISPTarget.c +++ b/Projects/AVRISP-MKII/Lib/ISP/ISPTarget.c @@ -37,6 +37,30 @@ #if defined(ENABLE_ISP_PROTOCOL) || defined(__DOXYGEN__) +/** List of SPI prescaler masks for possible AVRStudio ISP programming speeds. */ +static uint8_t SPIMaskFromSCKDuration[] PROGMEM = +{ +#if (F_CPU == 8000000) + SPI_SPEED_FCPU_DIV_2, // AVRStudio = 8MHz SPI, Actual = 4MHz SPI + SPI_SPEED_FCPU_DIV_2, // AVRStudio = 4MHz SPI, Actual = 4MHz SPI + SPI_SPEED_FCPU_DIV_4, // AVRStudio = 2MHz SPI, Actual = 2MHz SPI + SPI_SPEED_FCPU_DIV_8, // AVRStudio = 1MHz SPI, Actual = 1MHz SPI + SPI_SPEED_FCPU_DIV_16, // AVRStudio = 500KHz SPI, Actual = 500KHz SPI + SPI_SPEED_FCPU_DIV_32, // AVRStudio = 250KHz SPI, Actual = 250KHz SPI + SPI_SPEED_FCPU_DIV_64, // AVRStudio = 125KHz SPI, Actual = 125KHz SPI +#elif (F_CPU == 16000000) + SPI_SPEED_FCPU_DIV_2, // AVRStudio = 8MHz SPI, Actual = 8MHz SPI + SPI_SPEED_FCPU_DIV_4, // AVRStudio = 4MHz SPI, Actual = 4MHz SPI + SPI_SPEED_FCPU_DIV_8, // AVRStudio = 2MHz SPI, Actual = 2MHz SPI + SPI_SPEED_FCPU_DIV_16, // AVRStudio = 1MHz SPI, Actual = 1MHz SPI + SPI_SPEED_FCPU_DIV_32, // AVRStudio = 500KHz SPI, Actual = 500KHz SPI + SPI_SPEED_FCPU_DIV_64, // AVRStudio = 250KHz SPI, Actual = 250KHz SPI + SPI_SPEED_FCPU_DIV_128 // AVRStudio = 125KHz SPI, Actual = 125KHz SPI +#else + #error No SPI prescaler masks for chosen F_CPU speed. +#endif +}; + /** Converts the given AVR Studio SCK duration parameter (set by a SET PARAM command from the host) to the nearest * possible SPI clock prescaler mask for passing to the SPI_Init() routine. * @@ -44,35 +68,12 @@ */ uint8_t ISPTarget_GetSPIPrescalerMask(void) { - static const uint8_t SPIMaskFromSCKDuration[] = - { - #if (F_CPU == 8000000) - SPI_SPEED_FCPU_DIV_2, // AVRStudio = 8MHz SPI, Actual = 4MHz SPI - SPI_SPEED_FCPU_DIV_2, // AVRStudio = 4MHz SPI, Actual = 4MHz SPI - SPI_SPEED_FCPU_DIV_4, // AVRStudio = 2MHz SPI, Actual = 2MHz SPI - SPI_SPEED_FCPU_DIV_8, // AVRStudio = 1MHz SPI, Actual = 1MHz SPI - SPI_SPEED_FCPU_DIV_16, // AVRStudio = 500KHz SPI, Actual = 500KHz SPI - SPI_SPEED_FCPU_DIV_32, // AVRStudio = 250KHz SPI, Actual = 250KHz SPI - SPI_SPEED_FCPU_DIV_64, // AVRStudio = 125KHz SPI, Actual = 125KHz SPI - #elif (F_CPU == 16000000) - SPI_SPEED_FCPU_DIV_2, // AVRStudio = 8MHz SPI, Actual = 8MHz SPI - SPI_SPEED_FCPU_DIV_4, // AVRStudio = 4MHz SPI, Actual = 4MHz SPI - SPI_SPEED_FCPU_DIV_8, // AVRStudio = 2MHz SPI, Actual = 2MHz SPI - SPI_SPEED_FCPU_DIV_16, // AVRStudio = 1MHz SPI, Actual = 1MHz SPI - SPI_SPEED_FCPU_DIV_32, // AVRStudio = 500KHz SPI, Actual = 500KHz SPI - SPI_SPEED_FCPU_DIV_64, // AVRStudio = 250KHz SPI, Actual = 250KHz SPI - SPI_SPEED_FCPU_DIV_128 // AVRStudio = 125KHz SPI, Actual = 125KHz SPI - #else - #error No SPI prescaler masks for chosen F_CPU speed. - #endif - }; - uint8_t SCKDuration = V2Params_GetParameterValue(PARAM_SCK_DURATION); if (SCKDuration >= sizeof(SPIMaskFromSCKDuration)) SCKDuration = (sizeof(SPIMaskFromSCKDuration) - 1); - return SPIMaskFromSCKDuration[SCKDuration]; + return pgm_read_byte(&SPIMaskFromSCKDuration[SCKDuration]); } /** Asserts or deasserts the target's reset line, using the correct polarity as set by the host using a SET PARAM command. |