arch: expand SPI API to handle slave mode of operation Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
arch: move SPI setup code into a generic helper Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
arch: add timer1_disable helper for ATmega48P Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
arch: add SPI API Add simple init master and tx byte helpers. Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
arch: add a timer1 ATmega48P API This adds a simple to use function that sets up timer1. Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
arch: include mcu-specific headers after defining the various macros This allows the mcu-specific headers to use them. Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
arch: make TCNT1, ICR1, OCR1A, and OCR1B accessible as uint16_t Use unions to make the registers accessible as both uint8_t low/high pair as well as a uint16_t. Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
arch: include string.h for memset, etc. Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
Add generic INTERRUPT_{EN,DIS}ABLE macros
Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
build: warn if switch of enum doesn't list all values Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
arch: define REG_PCICR_PCIE[0-2] on ATmega48P Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
arch: define friedlier macros for TCCR1B's ICES field on ATmega48P Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
arch.h: add ARRAY_LEN Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
arch: add MCU_RAW_FREQ for ATmega48P Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
arch: move most of generic code into arch/generic_*.h Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
arch: add mcu_set_clock_prescalar helper A more advanced version would disable interrupts if they are enabled to avoid an interrupt mid-function breaking the back-to-back instruction requirement. Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
arch: add __set_pin static inline This is a low-overhead function to set/clear a GPIO pin. Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
arch: add PIN_{INPUT,OUTPUT}_* macros
These can be used to construct the PORT and DDR register values in more
semantically readable way.
Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
arch: add ATmega48P EECR register defines Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
arch: fix ATmega48P's eearh register name There was a typo. Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>