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Faster SPI communication

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According to specs, the display can handle up to 10 MHz SPI traffic
(minimum cycle time is 100 ns). This patch sets the SPI port to
7.5 MHz (60 MHz clock with divisor 8).  In my tests the display works
even fine with SPI frequency at 60 MHz.  I also minimized the delays
(the spec doesn't require a long setup time) and use the registers to
check when transfer is done instead of using a fixed delay.

This patch also changes the swipe function to swipe pixel by pixel.
Otherwise, the swipe would happen too fast to be seen.

This changes the display update time from 11 ms to 1.5 ms.
This commit is contained in:
Jochen Hoenicke 2016-07-13 12:51:47 +02:00
parent 4c379e36ec
commit 5dae02bbbf
No known key found for this signature in database
GPG Key ID: EB17C6B5E51193F5
2 changed files with 8 additions and 12 deletions
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17
oled.c
View File

@ -82,11 +82,12 @@ static bool is_debug_mode = 0;
inline void SPISend(uint32_t base, uint8_t *data, int len) inline void SPISend(uint32_t base, uint8_t *data, int len)
{ {
int i; int i;
delay(400); delay(1);
for (i = 0; i < len; i++) { for (i = 0; i < len; i++) {
spi_send(base, data[i]); spi_send(base, data[i]);
} }
delay(800); while (!(SPI_SR(base) & SPI_SR_TXE));
while ((SPI_SR(base) & SPI_SR_BSY));
} }
/* /*
@ -364,18 +365,12 @@ void oledFrame(int x1, int y1, int x2, int y2)
void oledSwipeLeft(void) void oledSwipeLeft(void)
{ {
int i, j, k; int i, j, k;
for (i = 0; i < OLED_WIDTH / 4; i++) { for (i = 0; i < OLED_WIDTH; i++) {
for (j = 0; j < OLED_HEIGHT / 8; j++) { for (j = 0; j < OLED_HEIGHT / 8; j++) {
for (k = OLED_WIDTH / 4 - 1; k > 0; k--) { for (k = OLED_WIDTH-1; k > 0; k--) {
_oledbuffer[k * 4 + 3 + j * OLED_WIDTH] = _oledbuffer[k * 4 - 1 + j * OLED_WIDTH]; _oledbuffer[j * OLED_WIDTH + k] = _oledbuffer[j * OLED_WIDTH + k - 1];
_oledbuffer[k * 4 + 2 + j * OLED_WIDTH] = _oledbuffer[k * 4 - 2 + j * OLED_WIDTH];
_oledbuffer[k * 4 + 1 + j * OLED_WIDTH] = _oledbuffer[k * 4 - 3 + j * OLED_WIDTH];
_oledbuffer[k * 4 + 0 + j * OLED_WIDTH] = _oledbuffer[k * 4 - 4 + j * OLED_WIDTH];
} }
_oledbuffer[j * OLED_WIDTH] = 0; _oledbuffer[j * OLED_WIDTH] = 0;
_oledbuffer[j * OLED_WIDTH + 1] = 0;
_oledbuffer[j * OLED_WIDTH + 2] = 0;
_oledbuffer[j * OLED_WIDTH + 3] = 0;
} }
oledRefresh(); oledRefresh();
} }

3
setup.c
View File

@ -55,7 +55,7 @@ void setup(void)
gpio_set_af(GPIOA, GPIO_AF5, GPIO5 | GPIO7); gpio_set_af(GPIOA, GPIO_AF5, GPIO5 | GPIO7);
// spi_disable_crc(SPI1); // spi_disable_crc(SPI1);
spi_init_master(SPI1, SPI_CR1_BAUDRATE_FPCLK_DIV_64, SPI_CR1_CPOL_CLK_TO_0_WHEN_IDLE, SPI_CR1_CPHA_CLK_TRANSITION_1, SPI_CR1_DFF_8BIT, SPI_CR1_MSBFIRST); spi_init_master(SPI1, SPI_CR1_BAUDRATE_FPCLK_DIV_8, SPI_CR1_CPOL_CLK_TO_0_WHEN_IDLE, SPI_CR1_CPHA_CLK_TRANSITION_1, SPI_CR1_DFF_8BIT, SPI_CR1_MSBFIRST);
spi_enable_ss_output(SPI1); spi_enable_ss_output(SPI1);
// spi_enable_software_slave_management(SPI1); // spi_enable_software_slave_management(SPI1);
// spi_set_nss_high(SPI1); // spi_set_nss_high(SPI1);
@ -71,4 +71,5 @@ void setupApp(void)
{ {
// hotfix for old bootloader // hotfix for old bootloader
gpio_mode_setup(GPIOA, GPIO_MODE_INPUT, GPIO_PUPD_NONE, GPIO9); gpio_mode_setup(GPIOA, GPIO_MODE_INPUT, GPIO_PUPD_NONE, GPIO9);
spi_init_master(SPI1, SPI_CR1_BAUDRATE_FPCLK_DIV_8, SPI_CR1_CPOL_CLK_TO_0_WHEN_IDLE, SPI_CR1_CPHA_CLK_TRANSITION_1, SPI_CR1_DFF_8BIT, SPI_CR1_MSBFIRST);
} }