2 Copyright 2018 Massdrop Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 #include "arm_atsam_protocol.h"
22 void SPI_WriteSRData(void)
29 while (!(SCSPI->SPI.INTFLAG.bit.DRE) && --timeout) { DBGC(DC_SPI_WRITE_DRE); }
31 SCSPI->SPI.DATA.bit.DATA = srdata.reg & 0xFF; //Shift in bits 7-0
33 while (!(SCSPI->SPI.INTFLAG.bit.TXC) && --timeout) { DBGC(DC_SPI_WRITE_TXC_1); }
35 SCSPI->SPI.DATA.bit.DATA = (srdata.reg >> 8) & 0xFF; //Shift in bits 15-8
37 while (!(SCSPI->SPI.INTFLAG.bit.TXC) && --timeout) { DBGC(DC_SPI_WRITE_TXC_2); }
46 DBGC(DC_SPI_INIT_BEGIN);
48 CLK_set_spi_freq(CHAN_SERCOM_SPI, FREQ_SPI_DEFAULT);
50 PORT->Group[0].PMUX[6].bit.PMUXE = 2;
51 PORT->Group[0].PMUX[6].bit.PMUXO = 2;
52 PORT->Group[0].PINCFG[12].bit.PMUXEN = 1;
53 PORT->Group[0].PINCFG[13].bit.PMUXEN = 1;
55 //Configure Shift Registers
60 SCSPI->SPI.CTRLA.bit.DORD = 1;
61 SCSPI->SPI.CTRLA.bit.CPOL = 1;
62 SCSPI->SPI.CTRLA.bit.CPHA = 1;
63 SCSPI->SPI.CTRLA.bit.DIPO = 3;
64 SCSPI->SPI.CTRLA.bit.MODE = 3; //master
66 SCSPI->SPI.CTRLA.bit.ENABLE = 1;
68 while (SCSPI->SPI.SYNCBUSY.bit.ENABLE && timeout--) { DBGC(DC_SPI_SYNC_ENABLING); }
71 srdata.bit.HUB_CONNECT = 0;
72 srdata.bit.HUB_RESET_N = 0;
74 srdata.bit.E_UP_N = 1;
76 srdata.bit.E_DN1_N = 1;
77 srdata.bit.E_VBUS_1 = 0;
78 srdata.bit.E_VBUS_2 = 0;
85 //Enable register output
88 DBGC(DC_SPI_INIT_COMPLETE);