diff options
Diffstat (limited to 'tmk_core/protocol/arm_atsam/spi.c')
-rw-r--r-- | tmk_core/protocol/arm_atsam/spi.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/tmk_core/protocol/arm_atsam/spi.c b/tmk_core/protocol/arm_atsam/spi.c new file mode 100644 index 0000000000..6036a92204 --- /dev/null +++ b/tmk_core/protocol/arm_atsam/spi.c @@ -0,0 +1,90 @@ +/* +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" + +Srdata_t srdata; + +void SPI_WriteSRData(void) +{ + uint16_t timeout; + + SC2_RCLCK_LO; + + timeout = 50000; + while (!(SCSPI->SPI.INTFLAG.bit.DRE) && --timeout) { DBGC(DC_SPI_WRITE_DRE); } + + SCSPI->SPI.DATA.bit.DATA = srdata.reg & 0xFF; //Shift in bits 7-0 + timeout = 50000; + while (!(SCSPI->SPI.INTFLAG.bit.TXC) && --timeout) { DBGC(DC_SPI_WRITE_TXC_1); } + + SCSPI->SPI.DATA.bit.DATA = (srdata.reg >> 8) & 0xFF; //Shift in bits 15-8 + timeout = 50000; + while (!(SCSPI->SPI.INTFLAG.bit.TXC) && --timeout) { DBGC(DC_SPI_WRITE_TXC_2); } + + SC2_RCLCK_HI; +} + +void SPI_Init(void) +{ + uint32_t timeout; + + DBGC(DC_SPI_INIT_BEGIN); + + CLK_set_spi_freq(CHAN_SERCOM_SPI, FREQ_SPI_DEFAULT); + + PORT->Group[0].PMUX[6].bit.PMUXE = 2; + PORT->Group[0].PMUX[6].bit.PMUXO = 2; + PORT->Group[0].PINCFG[12].bit.PMUXEN = 1; + PORT->Group[0].PINCFG[13].bit.PMUXEN = 1; + + //Configure Shift Registers + SC2_DIRSET; + SC2_RCLCK_HI; + SC2_OE_DIS; + + SCSPI->SPI.CTRLA.bit.DORD = 1; + SCSPI->SPI.CTRLA.bit.CPOL = 1; + SCSPI->SPI.CTRLA.bit.CPHA = 1; + SCSPI->SPI.CTRLA.bit.DIPO = 3; + SCSPI->SPI.CTRLA.bit.MODE = 3; //master + + SCSPI->SPI.CTRLA.bit.ENABLE = 1; + timeout = 50000; + while (SCSPI->SPI.SYNCBUSY.bit.ENABLE && timeout--) { DBGC(DC_SPI_SYNC_ENABLING); } + + srdata.reg = 0; + srdata.bit.HUB_CONNECT = 0; + srdata.bit.HUB_RESET_N = 0; + srdata.bit.S_UP = 0; + srdata.bit.E_UP_N = 1; + srdata.bit.S_DN1 = 1; + srdata.bit.E_DN1_N = 1; + srdata.bit.E_VBUS_1 = 0; + srdata.bit.E_VBUS_2 = 0; + srdata.bit.SRC_1 = 1; + srdata.bit.SRC_2 = 1; + srdata.bit.IRST = 1; + srdata.bit.SDB_N = 0; + SPI_WriteSRData(); + + //Enable register output + SC2_OE_ENA; + + DBGC(DC_SPI_INIT_COMPLETE); +} + |