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betaflight/src/main/drivers/max7456.c
Marcin Baliniak 171b03bfb7 efactor MAX7456 driver code
2016-09-25 11:42:53 +02:00

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/*
* This file is part of Cleanflight.
*
* Cleanflight is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Cleanflight is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Cleanflight. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "platform.h"
#include "version.h"
#ifdef USE_MAX7456
#include "common/printf.h"
#include "drivers/bus_spi.h"
#include "drivers/light_led.h"
#include "drivers/system.h"
#include "drivers/nvic.h"
#include "drivers/dma.h"
#include "drivers/gpio.h"
#include "max7456.h"
#include "max7456_symbols.h"
//on shared SPI buss we want to change clock for OSD chip and restore for other devices
#ifdef MAX7456_SPI_CLK
#define ENABLE_MAX7456 {spiSetDivisor(MAX7456_SPI_INSTANCE, MAX7456_SPI_CLK);IOLo(max7456CsPin);}
#else
#define ENABLE_MAX7456 IOLo(max7456CsPin)
#endif
#ifdef MAX7456_RESTORE_CLK
#define DISABLE_MAX7456 {IOHi(max7456CsPin);spiSetDivisor(MAX7456_SPI_INSTANCE, MAX7456_RESTORE_CLK);}
#else
#define DISABLE_MAX7456 IOHi(max7456CsPin)
#endif
uint16_t maxScreenSize = VIDEO_BUFFER_CHARS_PAL;
// we write everything in screenBuffer and then comapre
// screenBuffer with shadowBuffer to upgrade only changed chars
// this solution is faster then redraw all screen
static uint8_t screenBuffer[VIDEO_BUFFER_CHARS_PAL+40]; //for faster writes we use memcpy so we need some space to don't overwrite buffer
static uint8_t shadowBuffer[VIDEO_BUFFER_CHARS_PAL];
//max chars to update in one idle
#define MAX_CHARS2UPDATE 100
#ifdef MAX7456_DMA_CHANNEL_TX
volatile bool dmaTransactionInProgress = false;
#endif
static uint8_t spiBuff[MAX_CHARS2UPDATE*6];
static uint8_t videoSignalCfg = 0;
static uint8_t videoSignalReg = VIDEO_MODE_PAL | OSD_ENABLE; //PAL by default
static bool max7456Lock = false;
static bool fontIsLoading = false;
static IO_t max7456CsPin = IO_NONE;
static uint8_t max7456_send(uint8_t add, uint8_t data)
{
spiTransferByte(MAX7456_SPI_INSTANCE, add);
return spiTransferByte(MAX7456_SPI_INSTANCE, data);
}
#ifdef MAX7456_DMA_CHANNEL_TX
static void max7456_send_dma(void* tx_buffer, void* rx_buffer, uint16_t buffer_size) {
DMA_InitTypeDef DMA_InitStructure;
#ifdef MAX7456_DMA_CHANNEL_RX
static uint16_t dummy[] = {0xffff};
#else
UNUSED(rx_buffer);
#endif
while (dmaTransactionInProgress); // Wait for prev DMA transaction
DMA_DeInit(MAX7456_DMA_CHANNEL_TX);
#ifdef MAX7456_DMA_CHANNEL_RX
DMA_DeInit(MAX7456_DMA_CHANNEL_RX);
#endif
// Common to both channels
DMA_StructInit(&DMA_InitStructure);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&(MAX7456_SPI_INSTANCE->DR));
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_BufferSize = buffer_size;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_Low;
#ifdef MAX7456_DMA_CHANNEL_RX
// Rx Channel
#ifdef STM32F4
DMA_InitStructure.DMA_Memory0BaseAddr = rx_buffer ? (uint32_t)rx_buffer : (uint32_t)(dummy);
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
#else
DMA_InitStructure.DMA_MemoryBaseAddr = rx_buffer ? (uint32_t)rx_buffer : (uint32_t)(dummy);
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
#endif
DMA_InitStructure.DMA_MemoryInc = rx_buffer ? DMA_MemoryInc_Enable : DMA_MemoryInc_Disable;
DMA_Init(MAX7456_DMA_CHANNEL_RX, &DMA_InitStructure);
DMA_Cmd(MAX7456_DMA_CHANNEL_RX, ENABLE);
#endif
// Tx channel
#ifdef STM32F4
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)tx_buffer; //max7456_screen;
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
#else
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)tx_buffer; //max7456_screen;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
#endif
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_Init(MAX7456_DMA_CHANNEL_TX, &DMA_InitStructure);
DMA_Cmd(MAX7456_DMA_CHANNEL_TX, ENABLE);
#ifdef MAX7456_DMA_CHANNEL_RX
DMA_ITConfig(MAX7456_DMA_CHANNEL_RX, DMA_IT_TC, ENABLE);
#else
DMA_ITConfig(MAX7456_DMA_CHANNEL_TX, DMA_IT_TC, ENABLE);
#endif
// Enable SPI TX/RX request
ENABLE_MAX7456;
dmaTransactionInProgress = true;
SPI_I2S_DMACmd(MAX7456_SPI_INSTANCE,
#ifdef MAX7456_DMA_CHANNEL_RX
SPI_I2S_DMAReq_Rx |
#endif
SPI_I2S_DMAReq_Tx, ENABLE);
}
void max7456_dma_irq_handler(dmaChannelDescriptor_t* descriptor) {
if (DMA_GET_FLAG_STATUS(descriptor, DMA_IT_TCIF)) {
#ifdef MAX7456_DMA_CHANNEL_RX
DMA_Cmd(MAX7456_DMA_CHANNEL_RX, DISABLE);
#endif
// make sure spi dmd transfer is complete
while (SPI_I2S_GetFlagStatus (MAX7456_SPI_INSTANCE, SPI_I2S_FLAG_TXE) == RESET) {};
while (SPI_I2S_GetFlagStatus (MAX7456_SPI_INSTANCE, SPI_I2S_FLAG_BSY) == SET) {};
//Empty RX buffer. RX DMA takes care of it if enabled
//this should be done after transmission finish!!!
while (SPI_I2S_GetFlagStatus(MAX7456_SPI_INSTANCE, SPI_I2S_FLAG_RXNE) == SET) {
MAX7456_SPI_INSTANCE->DR;
}
DMA_Cmd(MAX7456_DMA_CHANNEL_TX, DISABLE);
DMA_CLEAR_FLAG(descriptor, DMA_IT_TCIF);
SPI_I2S_DMACmd(MAX7456_SPI_INSTANCE,
#ifdef MAX7456_DMA_CHANNEL_RX
SPI_I2S_DMAReq_Rx |
#endif
SPI_I2S_DMAReq_Tx, DISABLE);
DISABLE_MAX7456;
dmaTransactionInProgress = false;
}
if (DMA_GET_FLAG_STATUS(descriptor, DMA_IT_HTIF)) {
DMA_CLEAR_FLAG(descriptor, DMA_IT_HTIF);
}
if (DMA_GET_FLAG_STATUS(descriptor, DMA_IT_TEIF)) {
DMA_CLEAR_FLAG(descriptor, DMA_IT_TEIF);
}
}
#endif
uint8_t max7456GetRowsCount(void)
{
if (videoSignalReg & VIDEO_MODE_PAL)
return VIDEO_LINES_PAL;
return VIDEO_LINES_NTSC;
}
//because MAX7456 need some time to detect video system etc. we need to wait for a while to initialize it at startup
//and in case of restart we need to reinitialize chip
void max7456ReInit(void)
{
uint8_t maxScreenRows;
uint8_t srdata = 0;
uint16_t x;
static uint8_t firstInit = 1;
//do not init MAX before camera power up correctly
if (millis() < 1500)
return;
ENABLE_MAX7456;
switch(videoSignalCfg) {
case PAL:
videoSignalReg = VIDEO_MODE_PAL | OSD_ENABLE;
break;
case NTSC:
videoSignalReg = VIDEO_MODE_NTSC | OSD_ENABLE;
break;
default:
srdata = max7456_send(MAX7456ADD_STAT, 0x00);
if ((0x02 & srdata) == 0x02)
videoSignalReg = VIDEO_MODE_NTSC | OSD_ENABLE;
}
if (videoSignalReg & VIDEO_MODE_PAL) { //PAL
maxScreenSize = VIDEO_BUFFER_CHARS_PAL;
maxScreenRows = VIDEO_LINES_PAL;
} else { // NTSC
maxScreenSize = VIDEO_BUFFER_CHARS_NTSC;
maxScreenRows = VIDEO_LINES_NTSC;
}
// set all rows to same charactor black/white level
for(x = 0; x < maxScreenRows; x++) {
max7456_send(MAX7456ADD_RB0 + x, BWBRIGHTNESS);
}
// make sure the Max7456 is enabled
max7456_send(VM0_REG, videoSignalReg);
max7456_send(DMM_REG, CLEAR_DISPLAY);
DISABLE_MAX7456;
//clear shadow to force redraw all screen in non-dma mode
memset(shadowBuffer, 0, maxScreenSize);
if (firstInit)
{
max7456RefreshAll();
firstInit = 0;
}
}
//here we init only CS and try to init MAX for first time
void max7456Init(uint8_t video_system)
{
#ifdef MAX7456_SPI_CS_PIN
max7456CsPin = IOGetByTag(IO_TAG(MAX7456_SPI_CS_PIN));
#endif
IOInit(max7456CsPin, OWNER_OSD, RESOURCE_SPI_CS, 0);
IOConfigGPIO(max7456CsPin, SPI_IO_CS_CFG);
spiSetDivisor(MAX7456_SPI_INSTANCE, SPI_CLOCK_STANDARD);
// force soft reset on Max7456
ENABLE_MAX7456;
max7456_send(VM0_REG, MAX7456_RESET);
DISABLE_MAX7456;
videoSignalCfg = video_system;
#ifdef MAX7456_DMA_CHANNEL_TX
dmaSetHandler(MAX7456_DMA_IRQ_HANDLER_ID, max7456_dma_irq_handler, NVIC_PRIO_MAX7456_DMA, 0);
#endif
//real init will be made letter when driver idle detect
}
//just fill with spaces with some tricks
void max7456ClearScreen(void)
{
uint16_t x;
uint32_t *p = (uint32_t*)&screenBuffer[0];
for (x = 0; x < VIDEO_BUFFER_CHARS_PAL/4; x++)
p[x] = 0x20202020;
}
uint8_t* max7456GetScreenBuffer(void) {
return screenBuffer;
}
void max7456WriteChar(uint8_t x, uint8_t y, uint8_t c)
{
screenBuffer[y*30+x] = c;
}
void max7456Write(uint8_t x, uint8_t y, char *buff)
{
uint8_t i = 0;
for (i = 0; *(buff+i); i++)
if (x+i < 30) //do not write over screen
screenBuffer[y*30+x+i] = *(buff+i);
}
#ifdef MAX7456_DMA_CHANNEL_TX
bool max7456DmaInProgres(void)
{
return dmaTransactionInProgress;
}
#endif
void max7456DrawScreen(void) {
uint8_t check;
static uint16_t pos = 0;
int k = 0, buff_len=0;
if (!max7456Lock && !fontIsLoading) {
//-----------------detect MAX7456 fail, or initialize it at startup when it is ready--------
max7456Lock = true;
ENABLE_MAX7456;
check = max7456_send(VM0_REG | 0x80, 0x00);
DISABLE_MAX7456;
if ( check != videoSignalReg)
max7456ReInit();
//------------ end of (re)init-------------------------------------
for (k=0; k< MAX_CHARS2UPDATE; k++)
{
if (screenBuffer[pos] != shadowBuffer[pos])
{
spiBuff[buff_len++] = MAX7456ADD_DMAH;
spiBuff[buff_len++] = pos >> 8;
spiBuff[buff_len++] = MAX7456ADD_DMAL;
spiBuff[buff_len++] = pos & 0xff;
spiBuff[buff_len++] = MAX7456ADD_DMDI;
spiBuff[buff_len++] = screenBuffer[pos];
shadowBuffer[pos] = screenBuffer[pos];
k++;
}
if (++pos >= maxScreenSize) {
pos = 0;
break;
}
}
if (buff_len) {
#ifdef MAX7456_DMA_CHANNEL_TX
if (buff_len > 0)
max7456_send_dma(spiBuff, NULL, buff_len);
#else
ENABLE_MAX7456;
for (k=0; k < buff_len; k++)
spiTransferByte(MAX7456_SPI_INSTANCE, spiBuff[k]);
DISABLE_MAX7456;
#endif // MAX7456_DMA_CHANNEL_TX
}
max7456Lock = false;
}
}
// this funcktion refresh all and should not be used when copter is armed
void max7456RefreshAll(void)
{
if (!max7456Lock) {
#ifdef MAX7456_DMA_CHANNEL_TX
while (dmaTransactionInProgress);
#endif
uint16_t xx;
max7456Lock = true;
ENABLE_MAX7456;
max7456_send(MAX7456ADD_DMAH, 0);
max7456_send(MAX7456ADD_DMAL, 0);
max7456_send(MAX7456ADD_DMM, 1);
for (xx = 0; xx < maxScreenSize; ++xx)
{
max7456_send(MAX7456ADD_DMDI, screenBuffer[xx]);
shadowBuffer[xx] = screenBuffer[xx];
}
max7456_send(MAX7456ADD_DMDI, 0xFF);
max7456_send(MAX7456ADD_DMM, 0);
DISABLE_MAX7456;
max7456Lock = false;
}
}
void max7456WriteNvm(uint8_t char_address, uint8_t *font_data) {
uint8_t x;
#ifdef MAX7456_DMA_CHANNEL_TX
while (dmaTransactionInProgress);
#endif
while (max7456Lock);
max7456Lock = true;
ENABLE_MAX7456;
// disable display
fontIsLoading = true;
max7456_send(VM0_REG, 0);
max7456_send(MAX7456ADD_CMAH, char_address); // set start address high
for(x = 0; x < 54; x++) {
max7456_send(MAX7456ADD_CMAL, x); //set start address low
max7456_send(MAX7456ADD_CMDI, font_data[x]);
#ifdef LED0_TOGGLE
LED0_TOGGLE;
#else
LED1_TOGGLE;
#endif
}
// transfer 54 bytes from shadow ram to NVM
max7456_send(MAX7456ADD_CMM, WRITE_NVR);
// wait until bit 5 in the status register returns to 0 (12ms)
while ((max7456_send(MAX7456ADD_STAT, 0x00) & STATUS_REG_NVR_BUSY) != 0x00);
DISABLE_MAX7456;
max7456Lock = false;
}
#endif
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