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Adapting MD380 display driver to uC/OS-III, making little code reorganisation and embedding endianness reordering into display_render()

This commit is contained in:
Silvano Seva 2020-10-20 11:07:09 +02:00 committed by Niccolò Izzo
parent f4ca5ca025
commit bdb59a3ff9
1 changed files with 26 additions and 4 deletions
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30
platform/drivers/display/HX83XX_md380.c
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@ -18,6 +18,8 @@
#include <stdio.h> #include <stdio.h>
#include <stddef.h> #include <stddef.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h>
#include <os.h>
#include "gpio.h" #include "gpio.h"
#include "display.h" #include "display.h"
#include "delays.h" #include "delays.h"
@ -110,8 +112,10 @@ static uint16_t *frameBuffer;
void __attribute__((used)) DMA2_Stream7_IRQHandler() void __attribute__((used)) DMA2_Stream7_IRQHandler()
{ {
OSIntEnter();
DMA2->HIFCR |= DMA_HIFCR_CTCIF7 | DMA_HIFCR_CTEIF7; /* Clear flags */ DMA2->HIFCR |= DMA_HIFCR_CTCIF7 | DMA_HIFCR_CTEIF7; /* Clear flags */
gpio_setPin(CS); gpio_setPin(CS);
OSIntExit();
} }
static inline __attribute__((__always_inline__)) void writeCmd(uint8_t cmd) static inline __attribute__((__always_inline__)) void writeCmd(uint8_t cmd)
@ -126,14 +130,20 @@ static inline __attribute__((__always_inline__)) void writeData(uint8_t val)
void display_init() void display_init()
{ {
/* Framebuffer size, in bytes */
const size_t fbSize = SCREEN_WIDTH * SCREEN_HEIGHT * sizeof(uint16_t);
/* Allocate framebuffer, two bytes per pixel */ /* Allocate framebuffer, two bytes per pixel */
frameBuffer = (uint16_t *) malloc(SCREEN_WIDTH * SCREEN_HEIGHT * 2); frameBuffer = (uint16_t *) malloc(fbSize);
if(frameBuffer == NULL) if(frameBuffer == NULL)
{ {
printf("*** LCD ERROR: cannot allocate framebuffer! ***"); printf("*** LCD ERROR: cannot allocate framebuffer! ***");
return; return;
} }
/* Clear framebuffer, setting all pixels to 0xFFFF makes the screen white */
memset(frameBuffer, 0xFF, fbSize);
/* /*
* Configure TIM8 for backlight PWM: Fpwm = 100kHz, 8 bit of resolution * Configure TIM8 for backlight PWM: Fpwm = 100kHz, 8 bit of resolution
* APB2 freq. is 84MHz, then: PSC = 327 to have Ftick = 256.097kHz * APB2 freq. is 84MHz, then: PSC = 327 to have Ftick = 256.097kHz
@ -383,7 +393,6 @@ void display_setBacklightLevel(uint8_t level)
void display_renderRows(uint8_t startRow, uint8_t endRow) void display_renderRows(uint8_t startRow, uint8_t endRow)
{ {
/* /*
* Put screen data lines back to alternate function mode, since they are in * Put screen data lines back to alternate function mode, since they are in
* common with keyboard buttons and the keyboard driver sets them as inputs. * common with keyboard buttons and the keyboard driver sets them as inputs.
@ -398,6 +407,18 @@ void display_renderRows(uint8_t startRow, uint8_t endRow)
gpio_clearPin(CS); gpio_clearPin(CS);
/*
* First of all, convert all pixels from little to big endian, for
* compatibility with the display driver. We do this after having brought
* the CS pin low, in this way user code calling the renderingInProgress
* function gets true as return value and does not stomp our work.
*/
for(size_t i = 0; i < SCREEN_HEIGHT * SCREEN_WIDTH; i++)
{
uint16_t pixel = frameBuffer[i];
frameBuffer[i] = __builtin_bswap16(pixel);
}
/* Configure start and end rows in display driver */ /* Configure start and end rows in display driver */
writeCmd(CMD_RASET); writeCmd(CMD_RASET);
writeData(0x00); writeData(0x00);
@ -414,8 +435,9 @@ void display_renderRows(uint8_t startRow, uint8_t endRow)
* we have to set the transfer size to twice the framebuffer size, since * we have to set the transfer size to twice the framebuffer size, since
* this one is made of 16 bit variables. * this one is made of 16 bit variables.
*/ */
DMA2_Stream7->NDTR = (endRow - startRow)*SCREEN_WIDTH*2; DMA2_Stream7->NDTR = (endRow - startRow) * SCREEN_WIDTH * sizeof(uint16_t);
DMA2_Stream7->PAR = ((uint32_t ) frameBuffer + (startRow*SCREEN_WIDTH*2)); DMA2_Stream7->PAR = ((uint32_t ) frameBuffer + (startRow * SCREEN_WIDTH
* sizeof(uint16_t)));
DMA2_Stream7->M0AR = LCD_FSMC_ADDR_DATA; DMA2_Stream7->M0AR = LCD_FSMC_ADDR_DATA;
DMA2_Stream7->CR = DMA_SxCR_CHSEL /* Channel 7 */ DMA2_Stream7->CR = DMA_SxCR_CHSEL /* Channel 7 */
| DMA_SxCR_PL_0 /* Medium priority */ | DMA_SxCR_PL_0 /* Medium priority */