Using PTA19 for EPD reset

This code will not work on V0 badges anymore. You'll need to remove
Q1 and Q2 and cut the trace on the top going to breakout pin 34 and
wire it to pin 33.

1 files changed, 11 insertions, 8 deletions

diff --git a/laser-tag software/epaper.c b/laser-tag software/epaper.c
index 1d3dfba..32427e5 100644
--- a/laser-tag software/epaper.c
+++ b/laser-tag software/epaper.c
@@ -9,9 +9,9 @@ typedef enum {       /* Image pixel -> Display pixel */
     EPD_normal       /* B -> B, W -> W (New Image) */
 } EPD_stage;
 
-static const gpio_output_pin_user_config_t pinDischarge = {
+static const gpio_output_pin_user_config_t pinReset = {
     .pinName = GPIO_MAKE_PIN(GPIOA_IDX, 19),
-    .config.outputLogic = 0,
+    .config.outputLogic = 1,
 };
 
 static const gpio_output_pin_user_config_t pinCS = {
@@ -45,7 +45,7 @@ void EPD_Init()
     PORT_HAL_SetMuxMode(g_portBase[GPIOD_IDX], 5, kPortMuxAlt2);
     PORT_HAL_SetMuxMode(g_portBase[GPIOD_IDX], 6, kPortMuxAlt2);
     PORT_HAL_SetMuxMode(g_portBase[GPIOD_IDX], 7, kPortMuxAlt2);
-    GPIO_DRV_OutputPinInit(&pinDischarge);
+    GPIO_DRV_OutputPinInit(&pinReset);
     GPIO_DRV_OutputPinInit(&pinCS);
     SPI_DRV_DmaMasterInit(1, &spiState);
     uint32_t calculatedBaudRate;
@@ -195,6 +195,14 @@ void EPD_frame_repeat(const uint8_t *data, uint8_t fixed_value, EPD_stage stage)
 
 int EPD_Draw(const uint8_t *old_image, const uint8_t *new_image)
 {
+    /* Reset */
+    GPIO_DRV_WritePinOutput(pinReset.pinName, 0);
+    GPIO_DRV_WritePinOutput(pinCS.pinName, 0);
+    EPD_Delay(5);
+    GPIO_DRV_WritePinOutput(pinReset.pinName, 1);
+    GPIO_DRV_WritePinOutput(pinCS.pinName, 1);
+    EPD_Delay(5);
+
     /* read the COG ID */
     uint8_t id = EPD_ReadCogID();
     if ((id & 0x0f) != 0x02) {
@@ -297,11 +305,6 @@ int EPD_Draw(const uint8_t *old_image, const uint8_t *new_image)
     EPD_WriteCommandByte(0x07, 0x01);
     EPD_Delay(50);
 
-    /* discharge external */
-    GPIO_DRV_WritePinOutput(pinDischarge.pinName, 1);
-    EPD_Delay(150);
-    GPIO_DRV_WritePinOutput(pinDischarge.pinName, 0);
-
     return 0;
 }