aboutsummaryrefslogtreecommitdiff
path: root/laser-tag software
diff options
context:
space:
mode:
authorDavid Barksdale <amatus@amatus.name>2016-02-22 21:52:52 -0600
committerDavid Barksdale <amatus@amatus.name>2016-02-22 21:52:52 -0600
commit7b22ffd3882f78d2cc357710bcf95fbf691f11e8 (patch)
tree7c9230928e77aa051dc1af0bda3d22d9ab1f6abf /laser-tag software
parenta719f86c6d24e2263ef8d9e8efb1e539257644a4 (diff)
Turn on those charge pumps!
Diffstat (limited to 'laser-tag software')
-rw-r--r--laser-tag software/epaper.c67
-rwxr-xr-xlaser-tag software/main.c6
2 files changed, 70 insertions, 3 deletions
diff --git a/laser-tag software/epaper.c b/laser-tag software/epaper.c
index df3e9a1..49bc2fe 100644
--- a/laser-tag software/epaper.c
+++ b/laser-tag software/epaper.c
@@ -19,6 +19,10 @@ static const spi_master_user_config_t spiConfig = {
.bitCount = kSpi8BitMode,
};
+static const uint8_t channel_select[] = {
+ 0x00, 0x00, 0x1f, 0xe0, 0x00, 0x00, 0x00, 0xff
+};
+
static spi_master_state_t spiState;
void EPD_Init()
@@ -36,7 +40,7 @@ void EPD_Init()
SPI_DRV_MasterConfigureBus(1, &spiConfig, &calculatedBaudRate);
}
-void EPD_WriteCommandBuffer(uint8_t index, uint8_t *data, size_t length)
+void EPD_WriteCommandBuffer(uint8_t index, const uint8_t *data, size_t length)
{
uint8_t tx[3] = { 0x70, index, 0x72 };
@@ -79,6 +83,15 @@ uint8_t EPD_ReadCogID()
return rx[1];
}
+void EPD_Delay(uint32_t ms)
+{
+ for (; ms > 0; --ms) {
+ /* XXX This is really stupid */
+ volatile int i;
+ for (i = 0; i < 306; ++i);
+ }
+}
+
int EPD_Draw()
{
/* read the COG ID */
@@ -99,9 +112,61 @@ int EPD_Draw()
/* power saving mode */
EPD_WriteCommandByte(0x0b, 0x02);
+ /* channel select */
+ EPD_WriteCommandBuffer(0x01, channel_select, sizeof channel_select);
+
+ /* high power mode osc */
+ EPD_WriteCommandByte(0x07, 0xd1);
+
+ /* power setting */
+ EPD_WriteCommandByte(0x08, 0x02);
+
+ /* Vcom level */
+ EPD_WriteCommandByte(0x09, 0xc2);
+
+ /* power setting */
+ EPD_WriteCommandByte(0x04, 0x03);
+
+ /* driver latch on */
+ EPD_WriteCommandByte(0x03, 0x01);
+
+ /* driver latch off */
+ EPD_WriteCommandByte(0x03, 0x00);
+ EPD_Delay(5);
+
+ int i;
+ for (i = 0; i < 4; ++i) {
+ /* charge pump positive voltage on - VGH/VDL on */
+ EPD_WriteCommandByte(0x05, 0x01);
+ EPD_Delay(240);
+
+ /* charge pump negative voltage on - VGL/VDL on */
+ EPD_WriteCommandByte(0x05, 0x03);
+ EPD_Delay(40);
+
+ /* charge pump Vcom on - Vcom driver on */
+ EPD_WriteCommandByte(0x05, 0x0f);
+ EPD_Delay(40);
+
+ /* check DC/DC */
+ uint8_t dc_state = EPD_ReadCommand(0x0f);
+ if (0x40 & dc_state)
+ break;
+ }
+
+ if (4 == i)
+ return -3;
+
+ /* output enable to disable */
+ EPD_WriteCommandByte(0x02, 0x40);
+
+ /* TODO Draw something */
+
+#if 0
/* Shutdown */
GPIO_DRV_WritePinOutput(pinDischarge.pinName, 1);
GPIO_DRV_WritePinOutput(pinDischarge.pinName, 0);
+#endif
return 0;
}
diff --git a/laser-tag software/main.c b/laser-tag software/main.c
index 99b8812..2da0fab 100755
--- a/laser-tag software/main.c
+++ b/laser-tag software/main.c
@@ -531,10 +531,12 @@ int main (void)
/* Draw something */
int ret = EPD_Draw();
- if (ret == -1) {
+ if (-1 == ret) {
led(0xff, 0x00, 0x00);
- } else if (ret == -2) {
+ } else if (-2 == ret) {
led(0xff, 0xff, 0x00);
+ } else if (-3 == ret) {
+ led(0x00, 0x00, 0xff);
} else {
led(0x00, 0xff, 0x00);
}