119 lines
3.0 KiB
C
119 lines
3.0 KiB
C
/*
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Copyright 2018 Massdrop Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "arm_atsam_protocol.h"
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#include "spi_master.h"
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#include "wait.h"
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#include "gpio.h"
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// #define SR_USE_BITBANG
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// Bodge for when spi_master is not available
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#ifdef SR_USE_BITBANG
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# define CLOCK_DELAY 10
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void shift_init_impl(void) {
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setPinOutput(SR_EXP_RCLK_PIN);
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setPinOutput(SPI_DATAOUT_PIN);
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setPinOutput(SPI_SCLK_PIN);
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}
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void shift_out_impl(const uint8_t *data, uint16_t length) {
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writePinLow(SR_EXP_RCLK_PIN);
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for (uint16_t i = 0; i < length; i++) {
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uint8_t val = data[i];
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// shift out lsb first
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for (uint8_t bit = 0; bit < 8; bit++) {
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writePin(SPI_DATAOUT_PIN, !!(val & (1 << bit)));
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writePin(SPI_SCLK_PIN, true);
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wait_us(CLOCK_DELAY);
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writePin(SPI_SCLK_PIN, false);
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wait_us(CLOCK_DELAY);
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}
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}
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writePinHigh(SR_EXP_RCLK_PIN);
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return SPI_STATUS_SUCCESS;
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}
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#else
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void shift_init_impl(void) { spi_init(); }
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void shift_out_impl(const uint8_t *data, uint16_t length) {
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spi_start(SR_EXP_RCLK_PIN, true, 0, 0);
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spi_transmit(data, length);
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spi_stop();
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}
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#endif
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// ***************************************************************
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void shift_out(const uint8_t *data, uint16_t length) { shift_out_impl(data, length); }
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void shift_enable(void) {
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setPinOutput(SR_EXP_OE_PIN);
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writePinLow(SR_EXP_OE_PIN);
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}
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void shift_disable(void) {
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setPinOutput(SR_EXP_OE_PIN);
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writePinHigh(SR_EXP_OE_PIN);
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}
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void shift_init(void) {
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shift_disable();
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shift_init_impl();
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}
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// ***************************************************************
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sr_exp_t sr_exp_data;
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void SR_EXP_WriteData(void) {
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uint8_t data[2] = {
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sr_exp_data.reg & 0xFF, // Shift in bits 7-0
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(sr_exp_data.reg >> 8) & 0xFF, // Shift in bits 15-8
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};
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shift_out(data, 2);
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}
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void SR_EXP_Init(void) {
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shift_init();
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sr_exp_data.reg = 0;
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sr_exp_data.bit.HUB_CONNECT = 0;
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sr_exp_data.bit.HUB_RESET_N = 0;
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sr_exp_data.bit.S_UP = 0;
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sr_exp_data.bit.E_UP_N = 1;
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sr_exp_data.bit.S_DN1 = 1;
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sr_exp_data.bit.E_DN1_N = 1;
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sr_exp_data.bit.E_VBUS_1 = 0;
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sr_exp_data.bit.E_VBUS_2 = 0;
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sr_exp_data.bit.SRC_1 = 1;
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sr_exp_data.bit.SRC_2 = 1;
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sr_exp_data.bit.IRST = 1;
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sr_exp_data.bit.SDB_N = 0;
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SR_EXP_WriteData();
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shift_enable();
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}
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