diff options
author | Nick Brassel <nick@tzarc.org> | 2021-08-29 08:20:25 +1000 |
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committer | Nick Brassel <nick@tzarc.org> | 2021-08-29 08:20:25 +1000 |
commit | f061ca497464fe85284906fb163a33eaee7a91ef (patch) | |
tree | 33ef1bfb529aed382e8526c607c4e18717f92571 /drivers/avr/spi_master.c | |
parent | ff65185dec6f97be1eb49f17cea526a0d0bbf3d6 (diff) | |
parent | 4bad375d7c09d949a9dcdd4feba147c9c7a67ec6 (diff) |
Breaking changes develop merge to master, 2021Q3 edition. (#14196)
Diffstat (limited to 'drivers/avr/spi_master.c')
-rw-r--r-- | drivers/avr/spi_master.c | 180 |
1 files changed, 0 insertions, 180 deletions
diff --git a/drivers/avr/spi_master.c b/drivers/avr/spi_master.c deleted file mode 100644 index 4e8fd3bcdf..0000000000 --- a/drivers/avr/spi_master.c +++ /dev/null @@ -1,180 +0,0 @@ -/* Copyright 2020 - * - * This program is free software: you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see <https://www.gnu.org/licenses/>. - */ - -#include "spi_master.h" - -#include "timer.h" - -#if defined(__AVR_AT90USB162__) || defined(__AVR_ATmega16U2__) || defined(__AVR_ATmega32U2__) || defined(__AVR_ATmega16U4__) || defined(__AVR_ATmega32U4__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB647__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB1287__) -# define SPI_SCK_PIN B1 -# define SPI_MOSI_PIN B2 -# define SPI_MISO_PIN B3 -#elif defined(__AVR_ATmega32A__) -# define SPI_SCK_PIN B7 -# define SPI_MOSI_PIN B5 -# define SPI_MISO_PIN B6 -#elif defined(__AVR_ATmega328P__) || defined(__AVR_ATmega328__) -# define SPI_SCK_PIN B5 -# define SPI_MOSI_PIN B3 -# define SPI_MISO_PIN B4 -#endif - -#ifndef SPI_TIMEOUT -# define SPI_TIMEOUT 100 -#endif - -static pin_t currentSlavePin = NO_PIN; -static uint8_t currentSlaveConfig = 0; -static bool currentSlave2X = false; - -void spi_init(void) { - writePinHigh(SPI_SS_PIN); - setPinOutput(SPI_SCK_PIN); - setPinOutput(SPI_MOSI_PIN); - setPinInput(SPI_MISO_PIN); - - SPCR = (_BV(SPE) | _BV(MSTR)); -} - -bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor) { - if (currentSlavePin != NO_PIN || slavePin == NO_PIN) { - return false; - } - - currentSlaveConfig = 0; - - if (lsbFirst) { - currentSlaveConfig |= _BV(DORD); - } - - switch (mode) { - case 1: - currentSlaveConfig |= _BV(CPHA); - break; - case 2: - currentSlaveConfig |= _BV(CPOL); - break; - case 3: - currentSlaveConfig |= (_BV(CPOL) | _BV(CPHA)); - break; - } - - uint16_t roundedDivisor = 1; - while (roundedDivisor < divisor) { - roundedDivisor <<= 1; - } - - switch (roundedDivisor) { - case 16: - currentSlaveConfig |= _BV(SPR0); - break; - case 64: - currentSlaveConfig |= _BV(SPR1); - break; - case 128: - currentSlaveConfig |= (_BV(SPR1) | _BV(SPR0)); - break; - case 2: - currentSlave2X = true; - break; - case 8: - currentSlave2X = true; - currentSlaveConfig |= _BV(SPR0); - break; - case 32: - currentSlave2X = true; - currentSlaveConfig |= _BV(SPR1); - break; - } - - SPCR |= currentSlaveConfig; - if (currentSlave2X) { - SPSR |= _BV(SPI2X); - } - currentSlavePin = slavePin; - setPinOutput(currentSlavePin); - writePinLow(currentSlavePin); - - return true; -} - -spi_status_t spi_write(uint8_t data) { - SPDR = data; - - uint16_t timeout_timer = timer_read(); - while (!(SPSR & _BV(SPIF))) { - if ((timer_read() - timeout_timer) >= SPI_TIMEOUT) { - return SPI_STATUS_TIMEOUT; - } - } - - return SPDR; -} - -spi_status_t spi_read() { - SPDR = 0x00; // Dummy - - uint16_t timeout_timer = timer_read(); - while (!(SPSR & _BV(SPIF))) { - if ((timer_read() - timeout_timer) >= SPI_TIMEOUT) { - return SPI_STATUS_TIMEOUT; - } - } - - return SPDR; -} - -spi_status_t spi_transmit(const uint8_t *data, uint16_t length) { - spi_status_t status; - - for (uint16_t i = 0; i < length; i++) { - status = spi_write(data[i]); - - if (status < 0) { - return status; - } - } - - return SPI_STATUS_SUCCESS; -} - -spi_status_t spi_receive(uint8_t *data, uint16_t length) { - spi_status_t status; - - for (uint16_t i = 0; i < length; i++) { - status = spi_read(); - - if (status >= 0) { - data[i] = status; - } else { - return status; - } - } - - return SPI_STATUS_SUCCESS; -} - -void spi_stop(void) { - if (currentSlavePin != NO_PIN) { - setPinOutput(currentSlavePin); - writePinHigh(currentSlavePin); - currentSlavePin = NO_PIN; - SPSR &= ~(_BV(SPI2X)); - SPCR &= ~(currentSlaveConfig); - currentSlaveConfig = 0; - currentSlave2X = false; - } -} |