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Split out arm_atsam shift register logic (#14848)

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fix_template_bootmagic
Joel Challis 4 years ago committed by GitHub
parent 1b93d576f8
commit 1b1f3ec68e
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GPG Key ID: 4AEE18F83AFDEB23
10 changed files with 301 additions and 140 deletions
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  1. 18
      keyboards/massdrop/alt/config.h
  2. 18
      keyboards/massdrop/ctrl/config.h
  3. 8
      tmk_core/common/arm_atsam/gpio.h
  4. 3
      tmk_core/protocol/arm_atsam.mk
  5. 2
      tmk_core/protocol/arm_atsam/arm_atsam_protocol.h
  6. 118
      tmk_core/protocol/arm_atsam/shift_register.c
  7. 25
      tmk_core/protocol/arm_atsam/shift_register.h
  8. 92
      tmk_core/protocol/arm_atsam/spi.c
  9. 109
      tmk_core/protocol/arm_atsam/spi_master.c
  10. 48
      tmk_core/protocol/arm_atsam/spi_master.h

18
keyboards/massdrop/alt/config.h
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@ -50,22 +50,18 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
/* This Shift Register expands available hardware output lines to control additional peripherals */ /* This Shift Register expands available hardware output lines to control additional peripherals */
/* It uses four lines from the MCU to provide 16 output lines */ /* It uses four lines from the MCU to provide 16 output lines */
/* Shift Register Clock configuration (MCU to ShiftRegister.RCLK) */ /* Shift Register Clock configuration (MCU to ShiftRegister.RCLK) */
#define SR_EXP_RCLK_PORT PB #define SR_EXP_RCLK_PIN B14
#define SR_EXP_RCLK_PIN 14
/* Shift Register Output Enable configuration (MCU to ShiftRegister.OE_N) */ /* Shift Register Output Enable configuration (MCU to ShiftRegister.OE_N) */
#define SR_EXP_OE_N_PORT PB #define SR_EXP_OE_PIN B15
#define SR_EXP_OE_N_PIN 15
/* SERCOM port to use for Shift Register SPI */ /* SERCOM port to use for Shift Register SPI */
/* DATAOUT and SCLK must be configured to use hardware pins of this port */ /* DATAOUT and SCLK must be configured to use hardware pins of this port */
#define SR_EXP_SERCOM SERCOM2 #define SPI_SERCOM SERCOM2
/* Shift Register SPI Data Out configuration (MCU.SERCOMx.PAD[0] to ShiftRegister.SER) */ /* Shift Register SPI Data Out configuration (MCU.SERCOMx.PAD[0] to ShiftRegister.SER) */
#define SR_EXP_DATAOUT_PORT PA #define SPI_DATAOUT_PIN A12
#define SR_EXP_DATAOUT_PIN 12 #define SPI_DATAOUT_MUX 2
#define SR_EXP_DATAOUT_MUX 2
/* Shift Register SPI Serial Clock configuration (MCU.SERCOMx.PAD[1] to ShiftRegister.SRCLK) */ /* Shift Register SPI Serial Clock configuration (MCU.SERCOMx.PAD[1] to ShiftRegister.SRCLK) */
#define SR_EXP_SCLK_PORT PA #define SPI_SCLK_PIN A13
#define SR_EXP_SCLK_PIN 13 #define SPI_SCLK_MUX 2
#define SR_EXP_SCLK_MUX 2
/* Debug LED (Small LED Located near MCU) */ /* Debug LED (Small LED Located near MCU) */
#define DEBUG_LED_ENABLE 1 #define DEBUG_LED_ENABLE 1

18
keyboards/massdrop/ctrl/config.h
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@ -49,22 +49,18 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
/* This Shift Register expands available hardware output lines to control additional peripherals */ /* This Shift Register expands available hardware output lines to control additional peripherals */
/* It uses four lines from the MCU to provide 16 output lines */ /* It uses four lines from the MCU to provide 16 output lines */
/* Shift Register Clock configuration (MCU to ShiftRegister.RCLK) */ /* Shift Register Clock configuration (MCU to ShiftRegister.RCLK) */
#define SR_EXP_RCLK_PORT PB #define SR_EXP_RCLK_PIN B14
#define SR_EXP_RCLK_PIN 14
/* Shift Register Output Enable configuration (MCU to ShiftRegister.OE_N) */ /* Shift Register Output Enable configuration (MCU to ShiftRegister.OE_N) */
#define SR_EXP_OE_N_PORT PB #define SR_EXP_OE_PIN B15
#define SR_EXP_OE_N_PIN 15
/* SERCOM port to use for Shift Register SPI */ /* SERCOM port to use for Shift Register SPI */
/* DATAOUT and SCLK must be configured to use hardware pins of this port */ /* DATAOUT and SCLK must be configured to use hardware pins of this port */
#define SR_EXP_SERCOM SERCOM2 #define SPI_SERCOM SERCOM2
/* Shift Register SPI Data Out configuration (MCU.SERCOMx.PAD[0] to ShiftRegister.SER) */ /* Shift Register SPI Data Out configuration (MCU.SERCOMx.PAD[0] to ShiftRegister.SER) */
#define SR_EXP_DATAOUT_PORT PA #define SPI_DATAOUT_PIN A12
#define SR_EXP_DATAOUT_PIN 12 #define SPI_DATAOUT_MUX 2
#define SR_EXP_DATAOUT_MUX 2
/* Shift Register SPI Serial Clock configuration (MCU.SERCOMx.PAD[1] to ShiftRegister.SRCLK) */ /* Shift Register SPI Serial Clock configuration (MCU.SERCOMx.PAD[1] to ShiftRegister.SRCLK) */
#define SR_EXP_SCLK_PORT PA #define SPI_SCLK_PIN A13
#define SR_EXP_SCLK_PIN 13 #define SPI_SCLK_MUX 2
#define SR_EXP_SCLK_MUX 2
/* Debug LED (Small LED Located near MCU) */ /* Debug LED (Small LED Located near MCU) */
#define DEBUG_LED_ENABLE 1 #define DEBUG_LED_ENABLE 1

8
tmk_core/common/arm_atsam/gpio.h
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@ -64,7 +64,13 @@ typedef uint8_t pin_t;
PORT->Group[SAMD_PORT(pin)].OUTCLR.reg = SAMD_PIN_MASK(pin); \ PORT->Group[SAMD_PORT(pin)].OUTCLR.reg = SAMD_PIN_MASK(pin); \
} while (0) } while (0)
#define writePin(pin, level) ((level) ? (writePinHigh(pin)) : (writePinLow(pin))) #define writePin(pin, level) \
do { \
if (level) \
PORT->Group[SAMD_PORT(pin)].OUTSET.reg = SAMD_PIN_MASK(pin); \
else \
PORT->Group[SAMD_PORT(pin)].OUTCLR.reg = SAMD_PIN_MASK(pin); \
} while (0)
#define readPin(pin) ((PORT->Group[SAMD_PORT(pin)].IN.reg & SAMD_PIN_MASK(pin)) != 0) #define readPin(pin) ((PORT->Group[SAMD_PORT(pin)].IN.reg & SAMD_PIN_MASK(pin)) != 0)

3
tmk_core/protocol/arm_atsam.mk
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@ -9,7 +9,8 @@ ifeq ($(RGB_MATRIX_DRIVER),custom)
SRC += $(ARM_ATSAM_DIR)/md_rgb_matrix.c SRC += $(ARM_ATSAM_DIR)/md_rgb_matrix.c
endif endif
SRC += $(ARM_ATSAM_DIR)/main_arm_atsam.c SRC += $(ARM_ATSAM_DIR)/main_arm_atsam.c
SRC += $(ARM_ATSAM_DIR)/spi.c SRC += $(ARM_ATSAM_DIR)/shift_register.c
SRC += $(ARM_ATSAM_DIR)/spi_master.c
SRC += $(ARM_ATSAM_DIR)/startup.c SRC += $(ARM_ATSAM_DIR)/startup.c
SRC += $(ARM_ATSAM_DIR)/usb/main_usb.c SRC += $(ARM_ATSAM_DIR)/usb/main_usb.c

2
tmk_core/protocol/arm_atsam/arm_atsam_protocol.h
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@ -27,7 +27,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "wait.h" #include "wait.h"
#include "adc.h" #include "adc.h"
#include "i2c_master.h" #include "i2c_master.h"
#include "spi.h" #include "shift_register.h"
#include "./usb/usb2422.h" #include "./usb/usb2422.h"

118
tmk_core/protocol/arm_atsam/shift_register.c
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@ -0,0 +1,118 @@
/*
Copyright 2018 Massdrop Inc.
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 2 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 <http://www.gnu.org/licenses/>.
*/
#include "arm_atsam_protocol.h"
#include "spi_master.h"
#include "wait.h"
#include "gpio.h"
// #define SR_USE_BITBANG
// Bodge for when spi_master is not available
#ifdef SR_USE_BITBANG
# define CLOCK_DELAY 10
void shift_init_impl(void) {
setPinOutput(SR_EXP_RCLK_PIN);
setPinOutput(SPI_DATAOUT_PIN);
setPinOutput(SPI_SCLK_PIN);
}
void shift_out_impl(const uint8_t *data, uint16_t length) {
writePinLow(SR_EXP_RCLK_PIN);
for (uint16_t i = 0; i < length; i++) {
uint8_t val = data[i];
// shift out lsb first
for (uint8_t bit = 0; bit < 8; bit++) {
writePin(SPI_DATAOUT_PIN, !!(val & (1 << bit)));
writePin(SPI_SCLK_PIN, true);
wait_us(CLOCK_DELAY);
writePin(SPI_SCLK_PIN, false);
wait_us(CLOCK_DELAY);
}
}
writePinHigh(SR_EXP_RCLK_PIN);
return SPI_STATUS_SUCCESS;
}
#else
void shift_init_impl(void) { spi_init(); }
void shift_out_impl(const uint8_t *data, uint16_t length) {
spi_start(SR_EXP_RCLK_PIN, true, 0, 0);
spi_transmit(data, length);
spi_stop();
}
#endif
// ***************************************************************
void shift_out(const uint8_t *data, uint16_t length) { shift_out_impl(data, length); }
void shift_enable(void) {
setPinOutput(SR_EXP_OE_PIN);
writePinLow(SR_EXP_OE_PIN);
}
void shift_disable(void) {
setPinOutput(SR_EXP_OE_PIN);
writePinHigh(SR_EXP_OE_PIN);
}
void shift_init(void) {
shift_disable();
shift_init_impl();
}
// ***************************************************************
sr_exp_t sr_exp_data;
void SR_EXP_WriteData(void) {
uint8_t data[2] = {
sr_exp_data.reg & 0xFF, // Shift in bits 7-0
(sr_exp_data.reg >> 8) & 0xFF, // Shift in bits 15-8
};
shift_out(data, 2);
}
void SR_EXP_Init(void) {
shift_init();
sr_exp_data.reg = 0;
sr_exp_data.bit.HUB_CONNECT = 0;
sr_exp_data.bit.HUB_RESET_N = 0;
sr_exp_data.bit.S_UP = 0;
sr_exp_data.bit.E_UP_N = 1;
sr_exp_data.bit.S_DN1 = 1;
sr_exp_data.bit.E_DN1_N = 1;
sr_exp_data.bit.E_VBUS_1 = 0;
sr_exp_data.bit.E_VBUS_2 = 0;
sr_exp_data.bit.SRC_1 = 1;
sr_exp_data.bit.SRC_2 = 1;
sr_exp_data.bit.IRST = 1;
sr_exp_data.bit.SDB_N = 0;
SR_EXP_WriteData();
shift_enable();
}

25
tmk_core/protocol/arm_atsam/spi.h → tmk_core/protocol/arm_atsam/shift_register.h
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@ -15,28 +15,9 @@ You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. along with this program. If not, see <http://www.gnu.org/licenses/>.
*/ */
#ifndef _SPI_H_ #pragma once
#define _SPI_H_
/* Macros for Shift Register control */ #include <stdint.h>
#define SR_EXP_RCLK_LO PORT->Group[SR_EXP_RCLK_PORT].OUTCLR.reg = (1 << SR_EXP_RCLK_PIN)
#define SR_EXP_RCLK_HI PORT->Group[SR_EXP_RCLK_PORT].OUTSET.reg = (1 << SR_EXP_RCLK_PIN)
#define SR_EXP_OE_N_ENA PORT->Group[SR_EXP_OE_N_PORT].OUTCLR.reg = (1 << SR_EXP_OE_N_PIN)
#define SR_EXP_OE_N_DIS PORT->Group[SR_EXP_OE_N_PORT].OUTSET.reg = (1 << SR_EXP_OE_N_PIN)
/* Determine bits to set for mux selection */
#if SR_EXP_DATAOUT_PIN % 2 == 0
# define SR_EXP_DATAOUT_MUX_SEL PMUXE
#else
# define SR_EXP_DATAOUT_MUX_SEL PMUXO
#endif
/* Determine bits to set for mux selection */
#if SR_EXP_SCLK_PIN % 2 == 0
# define SR_EXP_SCLK_MUX_SEL PMUXE
#else
# define SR_EXP_SCLK_MUX_SEL PMUXO
#endif
/* Data structure to define Shift Register output expander hardware */ /* Data structure to define Shift Register output expander hardware */
/* This structure gets shifted into registers LSB first */ /* This structure gets shifted into registers LSB first */
@ -66,5 +47,3 @@ extern sr_exp_t sr_exp_data;
void SR_EXP_WriteData(void); void SR_EXP_WriteData(void);
void SR_EXP_Init(void); void SR_EXP_Init(void);
#endif //_SPI_H_

92
tmk_core/protocol/arm_atsam/spi.c
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@ -1,92 +0,0 @@
/*
Copyright 2018 Massdrop Inc.
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 2 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 <http://www.gnu.org/licenses/>.
*/
#include "arm_atsam_protocol.h"
sr_exp_t sr_exp_data;
void SR_EXP_WriteData(void) {
SR_EXP_RCLK_LO;
while (!(SR_EXP_SERCOM->SPI.INTFLAG.bit.DRE)) {
DBGC(DC_SPI_WRITE_DRE);
}
SR_EXP_SERCOM->SPI.DATA.bit.DATA = sr_exp_data.reg & 0xFF; // Shift in bits 7-0
while (!(SR_EXP_SERCOM->SPI.INTFLAG.bit.TXC)) {
DBGC(DC_SPI_WRITE_TXC_1);
}
SR_EXP_SERCOM->SPI.DATA.bit.DATA = (sr_exp_data.reg >> 8) & 0xFF; // Shift in bits 15-8
while (!(SR_EXP_SERCOM->SPI.INTFLAG.bit.TXC)) {
DBGC(DC_SPI_WRITE_TXC_2);
}
SR_EXP_RCLK_HI;
}
void SR_EXP_Init(void) {
DBGC(DC_SPI_INIT_BEGIN);
CLK_set_spi_freq(CHAN_SERCOM_SPI, FREQ_SPI_DEFAULT);
// Set up MCU Shift Register pins
PORT->Group[SR_EXP_RCLK_PORT].DIRSET.reg = (1 << SR_EXP_RCLK_PIN);
PORT->Group[SR_EXP_OE_N_PORT].DIRSET.reg = (1 << SR_EXP_OE_N_PIN);
// Set up MCU SPI pins
PORT->Group[SR_EXP_DATAOUT_PORT].PMUX[SR_EXP_DATAOUT_PIN / 2].bit.SR_EXP_DATAOUT_MUX_SEL = SR_EXP_DATAOUT_MUX; // MUX select for sercom
PORT->Group[SR_EXP_SCLK_PORT].PMUX[SR_EXP_SCLK_PIN / 2].bit.SR_EXP_SCLK_MUX_SEL = SR_EXP_SCLK_MUX; // MUX select for sercom
PORT->Group[SR_EXP_DATAOUT_PORT].PINCFG[SR_EXP_DATAOUT_PIN].bit.PMUXEN = 1; // MUX Enable
PORT->Group[SR_EXP_SCLK_PORT].PINCFG[SR_EXP_SCLK_PIN].bit.PMUXEN = 1; // MUX Enable
// Initialize Shift Register
SR_EXP_OE_N_DIS;
SR_EXP_RCLK_HI;
SR_EXP_SERCOM->SPI.CTRLA.bit.DORD = 1; // Data Order - LSB is transferred first
SR_EXP_SERCOM->SPI.CTRLA.bit.CPOL = 1; // Clock Polarity - SCK high when idle. Leading edge of cycle is falling. Trailing rising.
SR_EXP_SERCOM->SPI.CTRLA.bit.CPHA = 1; // Clock Phase - Leading Edge Falling, change, Trailing Edge - Rising, sample
SR_EXP_SERCOM->SPI.CTRLA.bit.DIPO = 3; // Data In Pinout - SERCOM PAD[3] is used as data input (Configure away from DOPO. Not using input.)
SR_EXP_SERCOM->SPI.CTRLA.bit.DOPO = 0; // Data Output PAD[0], Serial Clock PAD[1]
SR_EXP_SERCOM->SPI.CTRLA.bit.MODE = 3; // Operating Mode - Master operation
SR_EXP_SERCOM->SPI.CTRLA.bit.ENABLE = 1; // Enable - Peripheral is enabled or being enabled
while (SR_EXP_SERCOM->SPI.SYNCBUSY.bit.ENABLE) {
DBGC(DC_SPI_SYNC_ENABLING);
}
sr_exp_data.reg = 0;
sr_exp_data.bit.HUB_CONNECT = 0;
sr_exp_data.bit.HUB_RESET_N = 0;
sr_exp_data.bit.S_UP = 0;
sr_exp_data.bit.E_UP_N = 1;
sr_exp_data.bit.S_DN1 = 1;
sr_exp_data.bit.E_DN1_N = 1;
sr_exp_data.bit.E_VBUS_1 = 0;
sr_exp_data.bit.E_VBUS_2 = 0;
sr_exp_data.bit.SRC_1 = 1;
sr_exp_data.bit.SRC_2 = 1;
sr_exp_data.bit.IRST = 1;
sr_exp_data.bit.SDB_N = 0;
SR_EXP_WriteData();
// Enable Shift Register output
SR_EXP_OE_N_ENA;
DBGC(DC_SPI_INIT_COMPLETE);
}

109
tmk_core/protocol/arm_atsam/spi_master.c
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@ -0,0 +1,109 @@
/*
Copyright 2018 Massdrop Inc.
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 2 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 <http://www.gnu.org/licenses/>.
*/
#include "arm_atsam_protocol.h"
#include "spi_master.h"
#include "gpio.h"
/* Determine bits to set for mux selection */
#if SPI_DATAOUT_PIN % 2 == 0
# define SPI_DATAOUT_MUX_SEL PMUXE
#else
# define SPI_DATAOUT_MUX_SEL PMUXO
#endif
/* Determine bits to set for mux selection */
#if SPI_SCLK_PIN % 2 == 0
# define SPI_SCLK_MUX_SEL PMUXE
#else
# define SPI_SCLK_MUX_SEL PMUXO
#endif
static pin_t currentSelectPin = NO_PIN;
__attribute__((weak)) void spi_init(void) {
static bool is_initialised = false;
if (!is_initialised) {
is_initialised = true;
DBGC(DC_SPI_INIT_BEGIN);
CLK_set_spi_freq(CHAN_SERCOM_SPI, FREQ_SPI_DEFAULT);
// Set up MCU SPI pins
PORT->Group[SAMD_PORT(SPI_DATAOUT_PIN)].PMUX[SAMD_PIN(SPI_DATAOUT_PIN) / 2].bit.SPI_DATAOUT_MUX_SEL = SPI_DATAOUT_MUX; // MUX select for sercom
PORT->Group[SAMD_PORT(SPI_SCLK_PIN)].PMUX[SAMD_PIN(SPI_SCLK_PIN) / 2].bit.SPI_SCLK_MUX_SEL = SPI_SCLK_MUX; // MUX select for sercom
PORT->Group[SAMD_PORT(SPI_DATAOUT_PIN)].PINCFG[SAMD_PIN(SPI_DATAOUT_PIN)].bit.PMUXEN = 1; // MUX Enable
PORT->Group[SAMD_PORT(SPI_SCLK_PIN)].PINCFG[SAMD_PIN(SPI_SCLK_PIN)].bit.PMUXEN = 1; // MUX Enable
DBGC(DC_SPI_INIT_COMPLETE);
}
}
bool spi_start(pin_t csPin, bool lsbFirst, uint8_t mode, uint16_t divisor) {
if (currentSelectPin != NO_PIN || csPin == NO_PIN) {
return false;
}
currentSelectPin = csPin;
setPinOutput(currentSelectPin);
writePinLow(currentSelectPin);
SPI_SERCOM->SPI.CTRLA.bit.DORD = lsbFirst; // Data Order - LSB is transferred first
SPI_SERCOM->SPI.CTRLA.bit.CPOL = 1; // Clock Polarity - SCK high when idle. Leading edge of cycle is falling. Trailing rising.
SPI_SERCOM->SPI.CTRLA.bit.CPHA = 1; // Clock Phase - Leading Edge Falling, change, Trailing Edge - Rising, sample
SPI_SERCOM->SPI.CTRLA.bit.DIPO = 3; // Data In Pinout - SERCOM PAD[3] is used as data input (Configure away from DOPO. Not using input.)
SPI_SERCOM->SPI.CTRLA.bit.DOPO = 0; // Data Output PAD[0], Serial Clock PAD[1]
SPI_SERCOM->SPI.CTRLA.bit.MODE = 3; // Operating Mode - Master operation
SPI_SERCOM->SPI.CTRLA.bit.ENABLE = 1; // Enable - Peripheral is enabled or being enabled
while (SPI_SERCOM->SPI.SYNCBUSY.bit.ENABLE) {
DBGC(DC_SPI_SYNC_ENABLING);
}
return true;
}
spi_status_t spi_transmit(const uint8_t *data, uint16_t length) {
while (!(SPI_SERCOM->SPI.INTFLAG.bit.DRE)) {
DBGC(DC_SPI_WRITE_DRE);
}
for (uint16_t i = 0; i < length; i++) {
SPI_SERCOM->SPI.DATA.bit.DATA = data[i];
while (!(SPI_SERCOM->SPI.INTFLAG.bit.TXC)) {
DBGC(DC_SPI_WRITE_TXC_1);
}
}
return SPI_STATUS_SUCCESS;
}
void spi_stop(void) {
if (currentSelectPin != NO_PIN) {
setPinOutput(currentSelectPin);
writePinHigh(currentSelectPin);
currentSelectPin = NO_PIN;
}
}
// Not implemented yet....
spi_status_t spi_write(uint8_t data);
spi_status_t spi_read(void);
spi_status_t spi_receive(uint8_t *data, uint16_t length);

48
tmk_core/protocol/arm_atsam/spi_master.h
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@ -0,0 +1,48 @@
/* Copyright 2021 QMK
*
* 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/>.
*/
#pragma once
#include <stdbool.h>
typedef int16_t spi_status_t;
#define SPI_STATUS_SUCCESS (0)
#define SPI_STATUS_ERROR (-1)
#define SPI_STATUS_TIMEOUT (-2)
#define SPI_TIMEOUT_IMMEDIATE (0)
#define SPI_TIMEOUT_INFINITE (0xFFFF)
#ifdef __cplusplus
extern "C" {
#endif
void spi_init(void);
bool spi_start(pin_t slavePin, bool lsbFirst, uint8_t mode, uint16_t divisor);
spi_status_t spi_write(uint8_t data);
spi_status_t spi_read(void);
spi_status_t spi_transmit(const uint8_t *data, uint16_t length);
spi_status_t spi_receive(uint8_t *data, uint16_t length);
void spi_stop(void);
#ifdef __cplusplus
}
#endif
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