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valeh
2020-12-22 14:30:09 +02:00
commit 26b0ba5954
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177
basic-setup/components/u8g2/sys/avr/avr-libc/lib/u8x8_avr.c Normal file
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#include <util/delay.h>
#include "u8x8_avr.h"
#ifdef AVR_USE_HW_I2C
#include <avr-hw-i2c/i2cmaster.h>
#endif
#ifdef AVR_USE_HW_SPI
#ifndef SCK_DDR
#error "SCK_DDR must be defined externally, eg: -DSCK_DDR=DDRB, for atmega328p."
#endif
#ifndef SCK_BIT
#error "SCK_BIT must be defined externally, eg: -DSCK_BIT=5, for atmega328p."
#endif
#ifndef MOSI_DDR
#error "MOSI_DDR must be defined externally, eg: -DMOSI_DDR=DDRB, for atmega328p."
#endif
#ifndef MOSI_BIT
#error "MOSI_BIT must be defined externally, eg: -DMOSI_BIT=3, for atmega328p."
#endif
#endif
#define P_CPU_NS (1000000000UL / F_CPU)
#ifdef AVR_USE_HW_SPI
uint8_t u8x8_byte_avr_hw_spi (u8x8_t * u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) {
uint8_t *data;
switch (msg) {
case U8X8_MSG_BYTE_INIT:
SCK_DDR |= _BV (SCK_BIT);
MOSI_DDR |= _BV (MOSI_BIT);
SPCR = (_BV (SPE) | _BV (MSTR));
switch (u8x8->display_info->spi_mode) {
case 0:
break;
case 1:
SPCR |= _BV (CPHA);
break;
case 2:
SPCR |= _BV (CPOL);
break;
case 3:
SPCR |= _BV (CPOL);
SPCR |= _BV (CPHA);
break;
};
switch (F_CPU / u8x8->display_info->sck_clock_hz) {
case 2:
SPSR |= _BV (SPI2X);
break;
case 4:
break;
case 8:
SPSR |= _BV (SPI2X);
SPCR |= _BV (SPR0);
break;
case 16:
SPCR |= _BV (SPR0);
break;
case 32:
SPSR |= _BV (SPI2X);
SPCR |= _BV (SPR1);
break;
case 64:
SPCR |= _BV (SPR1);
break;
case 128:
SPCR |= _BV (SPR1);
SPCR |= _BV (SPR0);
break;
}
u8x8_gpio_SetCS(u8x8, u8x8->display_info->chip_disable_level);
break;
case U8X8_MSG_BYTE_SET_DC:
u8x8_gpio_SetDC(u8x8, arg_int);
break;
case U8X8_MSG_BYTE_START_TRANSFER:
u8x8_gpio_SetCS(u8x8, u8x8->display_info->chip_enable_level);
u8x8->gpio_and_delay_cb(u8x8, U8X8_MSG_DELAY_NANO, u8x8->display_info->post_chip_enable_wait_ns, NULL);
break;
case U8X8_MSG_BYTE_SEND:
data = (uint8_t *) arg_ptr;
while (arg_int > 0) {
SPDR = (uint8_t) * data;
while (!(SPSR & _BV (SPIF)));
data++;
arg_int--;
}
break;
case U8X8_MSG_BYTE_END_TRANSFER:
u8x8->gpio_and_delay_cb(u8x8, U8X8_MSG_DELAY_NANO, u8x8->display_info->pre_chip_disable_wait_ns, NULL);
u8x8_gpio_SetCS(u8x8, u8x8->display_info->chip_disable_level);
break;
default:
return 0;
}
return 1;
}
#endif
#ifdef AVR_USE_HW_I2C
uint8_t u8x8_byte_avr_hw_i2c(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
uint8_t *data;
switch(msg){
case U8X8_MSG_BYTE_SEND:
data = (uint8_t *)arg_ptr;
while( arg_int-- )
i2c_write(*data++);
break;
case U8X8_MSG_BYTE_INIT:
i2c_init();
break;
case U8X8_MSG_BYTE_SET_DC:
/* ignored for i2c */
break;
case U8X8_MSG_BYTE_START_TRANSFER:
i2c_start_wait(u8x8_GetI2CAddress(u8x8)+I2C_WRITE);
break;
case U8X8_MSG_BYTE_END_TRANSFER:
i2c_stop();
break;
default:
return 0;
}
return 1;
}
#endif
uint8_t u8x8_avr_delay (u8x8_t * u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr) {
uint8_t cycles;
switch(msg) {
case U8X8_MSG_DELAY_NANO: // delay arg_int * 1 nano second
// At 20Mhz, each cycle is 50ns, the call itself is slower.
break;
case U8X8_MSG_DELAY_100NANO: // delay arg_int * 100 nano seconds
// Approximate best case values...
#define CALL_CYCLES 26UL
#define CALC_CYCLES 4UL
#define RETURN_CYCLES 4UL
#define CYCLES_PER_LOOP 4UL
cycles = (100UL * arg_int) / (P_CPU_NS * CYCLES_PER_LOOP);
if (cycles > CALL_CYCLES + RETURN_CYCLES + CALC_CYCLES)
break;
__asm__ __volatile__ (
"1: sbiw %0,1" "\n\t" // 2 cycles
"brne 1b":"=w" (cycles):"0" (cycles) // 2 cycles
);
break;
case U8X8_MSG_DELAY_10MICRO: // delay arg_int * 10 micro seconds
while( arg_int-- ) _delay_us(10);
break;
case U8X8_MSG_DELAY_MILLI: // delay arg_int * 1 milli second
while( arg_int-- ) _delay_ms(1);
break;
default:
return 0;
}
return 1;
}