diff options
author | Joel Challis <git@zvecr.com> | 2021-10-22 00:49:38 +0100 |
---|---|---|
committer | GitHub <noreply@github.com> | 2021-10-22 00:49:38 +0100 |
commit | 1b1f3ec68ee1e7abe436a46bcfedf30f21330aef (patch) | |
tree | bbb7e0dd548773b6c1ead6275a4bafc1910c444a /tmk_core/protocol/arm_atsam/spi.c | |
parent | 1b93d576f84822d0f4947179ee49f614ba345f12 (diff) |
Split out arm_atsam shift register logic (#14848)
Diffstat (limited to 'tmk_core/protocol/arm_atsam/spi.c')
-rw-r--r-- | tmk_core/protocol/arm_atsam/spi.c | 92 |
1 files changed, 0 insertions, 92 deletions
diff --git a/tmk_core/protocol/arm_atsam/spi.c b/tmk_core/protocol/arm_atsam/spi.c deleted file mode 100644 index 3b118bc1f1..0000000000 --- a/tmk_core/protocol/arm_atsam/spi.c +++ /dev/null @@ -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); -} |