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option to deselect other device on SPI (for example network chip) #31

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option to deselect other device on SPI (for example network chip) #31

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7 changes: 7 additions & 0 deletions Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,9 @@ F_CPU = 16000000 # CPU clock frequency [Hz] NOT critical: it just shoul
SD_CS_PORT = PORTB # Data Register of the SD CS pin
SD_CS_DDR = DDRB # Data Direction Register of the SD CS pin
SD_CS_BIT = 4 # Bit of the SD CS pin
#OTHER_CS_PORT = PORTD # Data Register of other SPI device CS pin
#OTHER_CS_DDR = DDRD # Data Direction Register of other SPI device CS pin
#OTHER_CS_BIT = 2 # Bit of other SPI device CS pin
USE_LED = 0 # Debug with two (defined in asmfunc.S)
USE_UART = 0 # Debug on Serial. 0 ... deactivate or divider of http://wormfood.net/avrbaudcalc.php for baud rate!
#------------------------------------------------------------------
Expand All @@ -21,7 +24,11 @@ endif
TARGET = avr_boot
ASRC = asmfunc.S
OPTIMIZE = -Os -mcall-prologues -ffunction-sections -fdata-sections
ifdef OTHER_CS_BIT
DEFS = -DBOOT_ADR=$(BOOT_ADR) -DF_CPU=$(F_CPU) -DUSE_LED=$(USE_LED) -DUSE_UART=$(USE_UART) -DSD_CS_PORT=$(SD_CS_PORT) -DSD_CS_DDR=$(SD_CS_DDR) -DSD_CS_BIT=$(SD_CS_BIT) -DOTHER_CS_PORT=$(OTHER_CS_PORT) -DOTHER_CS_DDR=$(OTHER_CS_DDR) -DOTHER_CS_BIT=$(OTHER_CS_BIT)
else
DEFS = -DBOOT_ADR=$(BOOT_ADR) -DF_CPU=$(F_CPU) -DUSE_LED=$(USE_LED) -DUSE_UART=$(USE_UART) -DSD_CS_PORT=$(SD_CS_PORT) -DSD_CS_DDR=$(SD_CS_DDR) -DSD_CS_BIT=$(SD_CS_BIT)
endif
LIBS =
DEBUG = dwarf-2

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8 changes: 8 additions & 0 deletions asmfunc.S
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Expand Up @@ -17,6 +17,11 @@
#define DDR_CS _SFR_IO_ADDR(SD_CS_DDR), SD_CS_BIT
#define PORT_CS _SFR_IO_ADDR(SD_CS_PORT), SD_CS_BIT

;OTHER DEVICE CS PIN
#ifdef OTHER_CS_BIT
#define DDR_CS1 _SFR_IO_ADDR(OTHER_CS_DDR), OTHER_CS_BIT
#define PORT_CS1 _SFR_IO_ADDR(OTHER_CS_PORT), OTHER_CS_BIT
#endif
;---------------------------------------------------------------------------;
.nolist
#include <avr/io.h>
Expand Down Expand Up @@ -87,6 +92,9 @@ init_spi:
sbi DDR_DI ; DI: output
sbi DDR_CK ; SCLK: output
sbi PORT_DO ; DO: pull-up
#ifdef PORT_CS1
sbi PORT_CS1 ; CS1: pull-up
#endif
ret
.endfunc

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