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Tweak some u8g interface code

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This commit is contained in:
Scott Lahteine
2019-02-20 04:01:07 -06:00
parent ba39186364
commit 50917ccda6
2 changed files with 22 additions and 30 deletions
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18
Marlin/src/HAL/HAL_LPC1768/u8g/u8g_com_HAL_LPC1768_st7920_sw_spi.cpp
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@ -68,23 +68,15 @@
static pin_t SCK_pin_ST7920_HAL, MOSI_pin_ST7920_HAL_HAL;
static uint8_t SPI_speed = 0;
static uint8_t rs_last_state = 255;
static void u8g_com_LPC1768_st7920_write_byte_sw_spi(uint8_t rs, uint8_t val) {
if (rs != rs_last_state) { // time to send a command/data byte
static uint8_t rs_last_state = 255;
if (rs != rs_last_state) {
// Transfer Data (FA) or Command (F8)
swSpiTransfer(rs ? 0x0FA : 0x0F8, SPI_speed, SCK_pin_ST7920_HAL, -1, MOSI_pin_ST7920_HAL_HAL);
rs_last_state = rs;
if (rs == 0)
/* command */
swSpiTransfer(0x0F8, SPI_speed, SCK_pin_ST7920_HAL, -1, MOSI_pin_ST7920_HAL_HAL);
else
/* data */
swSpiTransfer(0x0FA, SPI_speed, SCK_pin_ST7920_HAL, -1, MOSI_pin_ST7920_HAL_HAL);
DELAY_US(40); // give the controller some time to process the data: 20 is bad, 30 is OK, 40 is safe
DELAY_US(40); // Give the controller time to process the data: 20 is bad, 30 is OK, 40 is safe
}
swSpiTransfer(val & 0x0F0, SPI_speed, SCK_pin_ST7920_HAL, -1, MOSI_pin_ST7920_HAL_HAL);
swSpiTransfer(val << 4, SPI_speed, SCK_pin_ST7920_HAL, -1, MOSI_pin_ST7920_HAL_HAL);
}