Use Deep-Sleep1 when suspending the pok3r

This decreases the power consumption to <1mA when the host
suspends the pok3r.

keyboards/vortex/boards/VORTEX_DUAL_60/board.c

@@ -73,6 +73,38 @@
     PAFIO(PORT, N, LINE_SPI_CS,   AFIO_GPIO) | \
 0)
 
+#define PESSR_L(LINE) ((PAL_PAD(LINE) < 8) ? (HT32_PAL_IDX(LINE) << (PAL_PAD(LINE) * 4uL)) : 0)
+#define PESSR_H(LINE) ((PAL_PAD(LINE) >=8) ? (HT32_PAL_IDX(LINE) << ((PAL_PAD(LINE) - 8uL) * 4uL)) : 0)
+
+/* doesn't work due to https://gcc.gnu.org/bugzilla/show_bug.cgi?id=4210 */
+/*
+#define PESSR(N, LINE) ((N) ? (PESSR_H(LINE)) : (PESSR_L(LINE)))
+#define ESSR_BITS(N) (\
+    PESSR(N, LINE_COL1) | \
+    PESSR(N, LINE_COL2) | \
+    PESSR(N, LINE_COL3) | \
+    PESSR(N, LINE_COL4) | \
+    PESSR(N, LINE_COL5) | \
+    PESSR(N, LINE_COL6) | \
+    PESSR(N, LINE_COL7) | \
+    PESSR(N, LINE_COL8) | \
+0)
+*/
+
+#define ESSR_BITS_0 (\
+    PESSR_L(LINE_COL1) | \
+    PESSR_L(LINE_COL2) | \
+    PESSR_L(LINE_COL3) | \
+    PESSR_L(LINE_COL4) | \
+0)
+
+#define ESSR_BITS_1 (\
+    PESSR_H(LINE_COL5) | \
+    PESSR_H(LINE_COL6) | \
+    PESSR_H(LINE_COL7) | \
+    PESSR_H(LINE_COL8) | \
+0)
+
 /**
  * @brief   PAL setup.
  * @details Digital I/O ports static configuration as defined in @p board.h.
@@ -144,8 +176,9 @@ const PALConfig pal_default_config = {
         .CFG[0] = AF_BITS(IOPORTE, 0),
         .CFG[1] = AF_BITS(IOPORTE, 1),
     },
-    .ESSR[0] = 0x00000000,
-    .ESSR[1] = 0x00000000,
+    // Enable Column Pins for EXTI
+    .ESSR[0] = ESSR_BITS_0,
+    .ESSR[1] = ESSR_BITS_1,
 };
 
 const ioline_t row_list[MATRIX_ROWS] = {

keyboards/vortex/pok3r/rules.mk

@@ -2,6 +2,7 @@
 
 SRC = \
 	matrix.c \
+	suspend.c \
 	eeprom.c \
 	backlight.c
 

keyboards/vortex/suspend.c

@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2018 Charlie Waters
+ *
+ * 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 "hal.h"
+
+#define WAKUPCR_EVWUPIEN_Mask 0x80000000uL
+#define SCR_DEEPSLEEP_Mask 0x04uL
+
+extern ioline_t row_list[MATRIX_ROWS];
+extern ioline_t col_list[MATRIX_COLS];
+
+void suspend_power_down(void) {
+  /* enable all rows */
+  for (int row = 0; row < MATRIX_ROWS; row++) {
+    palClearLine(row_list[row]);
+  }
+  /* enable EXTI clock */
+  CKCU->APBCCR0 |= CKCU_APBCCR0_EXTIEN;
+  /* enable Event Wakeup Interrupt */
+  NVIC_EnableIRQ(EVWUP_IRQn);
+  /* enable wakeup interrupt */
+  EXTI->WAKUPCR = WAKUPCR_EVWUPIEN_Mask;
+  for (int col = 0; col < MATRIX_COLS; col++) {
+    /* enable event wakeup for all column pads */
+    EXTI->WAKUPCR |= (1 << PAL_PAD(col_list[col]));
+    /* set wakeup polarity to low */
+    EXTI->WAKUPPOLR |= (1 << PAL_PAD(col_list[col]));
+  }
+  /* enable deep sleep */
+  SCB->SCR |= SCR_DEEPSLEEP_Mask;
+  /* sleep */
+  __WFI();
+  /* disable deep sleep */
+  SCB->SCR &= SCR_DEEPSLEEP_Mask;
+  /* disable all rows */
+  for (int row = 0; row < MATRIX_ROWS; row++) {
+    palSetLine(row_list[row]);
+  }
+}
+
+OSAL_IRQ_HANDLER(Vector58) {
+  OSAL_IRQ_PROLOGUE();
+  /* acknowledge interrupt */
+  EXTI->WAKUPFLG |= EXTI->WAKUPFLG;
+  /* disable interrupt */
+  EXTI->WAKUPCR = 0;
+	OSAL_IRQ_EPILOGUE();
+}

tmk_core/common/chibios/suspend.c

@@ -25,7 +25,7 @@ void suspend_idle(uint8_t time) {
  *
  * FIXME: needs doc
  */
-void suspend_power_down(void) {
+__attribute__ ((weak)) void suspend_power_down(void) {
 	// TODO: figure out what to power down and how
 	// shouldn't power down TPM/FTM if we want a breathing LED
 	// also shouldn't power down USB