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Split out arm_atsam shift register logic (#14848)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| /* | ||
| 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/>. | ||
| */ | ||
|
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| #include "arm_atsam_protocol.h" | ||
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| #include "spi_master.h" | ||
| #include "wait.h" | ||
| #include "gpio.h" | ||
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| // #define SR_USE_BITBANG | ||
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| // Bodge for when spi_master is not available | ||
| #ifdef SR_USE_BITBANG | ||
| # define CLOCK_DELAY 10 | ||
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| void shift_init_impl(void) { | ||
| setPinOutput(SR_EXP_RCLK_PIN); | ||
| setPinOutput(SPI_DATAOUT_PIN); | ||
| setPinOutput(SPI_SCLK_PIN); | ||
| } | ||
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| 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]; | ||
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| // 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); | ||
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| writePin(SPI_SCLK_PIN, false); | ||
| wait_us(CLOCK_DELAY); | ||
| } | ||
| } | ||
| writePinHigh(SR_EXP_RCLK_PIN); | ||
| return SPI_STATUS_SUCCESS; | ||
| } | ||
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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) { | ||
| spi_start(SR_EXP_RCLK_PIN, true, 0, 0); | ||
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| spi_transmit(data, length); | ||
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| spi_stop(); | ||
| } | ||
| #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) { | ||
| setPinOutput(SR_EXP_OE_PIN); | ||
| writePinLow(SR_EXP_OE_PIN); | ||
| } | ||
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| void shift_disable(void) { | ||
| setPinOutput(SR_EXP_OE_PIN); | ||
| writePinHigh(SR_EXP_OE_PIN); | ||
| } | ||
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| void shift_init(void) { | ||
| shift_disable(); | ||
| shift_init_impl(); | ||
| } | ||
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| // *************************************************************** | ||
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| sr_exp_t sr_exp_data; | ||
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| 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); | ||
| } | ||
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| void SR_EXP_Init(void) { | ||
| shift_init(); | ||
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| 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(); | ||
|
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| shift_enable(); | ||
| } |
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