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/*
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();
}
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