HC32F460填坑 - SPI POLLING

总结

目前，小一点的系统很流行SPI接口的显示屏，有黑白TN，有彩色TFT，有高对比OLED，显示分辨率从3296到320240不等，这些显示屏成本低，接口少，易于驱动，所以非常受欢迎

硬件连线通常有以下：
复位RESET，片选CS，地址A0，时钟SCK，数据SDI，背光正负，电源正负，可以做到10PIN以内

因为显示屏的SPI在某些TIMING上会有一些要求，所以片选CS通常使用GPIO模拟，另外RESET，A0也是GPIO，SCK，SDI会使用硬件SPI，达到比较高的传输速率（50MHZ）

这是MCU驱动SPI显示屏的时序图，CS选中器件，DC（A0）决定写指令还是写参数，如果当前BYTE传输期间A0是LOW，表示写指令，如果A0是HIGH，表示写参数，传输完成后，CS再拉高

#include "board.h"#define LCDCODE_REGFLAG_DELAY       0xFFFE
#define LCDCODE_REGFLAG_END         0xFFFF
#define LCDCODE_DATA_LEN            32typedef struct
{uint16_t reg;uint16_t len;uint8_t  dat[LCDCODE_DATA_LEN];
}lcd_code_t;static struct rt_semaphore spi3_tx_wait = {0x00};static void spi3_tx_dma_tc0_irq_cb(void)
{DMA_ClearIrqFlag(SPI3_DMA_UNIT, SPI3_DMA_TX_CHANNEL, TrnCpltIrq);rt_sem_release(&spi3_tx_wait);
}static void spi3_dma_config(void)
{stc_dma_config_t stcDmaCfg;stc_irq_regi_conf_t stcIrqRegiConf;/* configuration structure initialization */MEM_ZERO_STRUCT(stcDmaCfg);/* Configuration peripheral clock */PWC_Fcg0PeriphClockCmd(SPI3_DMA_CLOCK_UNIT, Enable);PWC_Fcg0PeriphClockCmd(PWC_FCG0_PERIPH_AOS, Enable);/* Configure TX DMA */stcDmaCfg.u16BlockSize           = 1u;stcDmaCfg.u16TransferCnt         = 128;stcDmaCfg.u32SrcAddr             = (uint32_t)(0);stcDmaCfg.u32DesAddr             = (uint32_t)(&SPI3_UNIT->DR);stcDmaCfg.stcDmaChCfg.enSrcInc   = AddressIncrease;stcDmaCfg.stcDmaChCfg.enDesInc   = AddressFix;stcDmaCfg.stcDmaChCfg.enTrnWidth = Dma8Bit;stcDmaCfg.stcDmaChCfg.enIntEn    = Enable;DMA_InitChannel(SPI3_DMA_UNIT, SPI3_DMA_TX_CHANNEL, &stcDmaCfg);DMA_SetTriggerSrc(SPI3_DMA_UNIT, SPI3_DMA_TX_CHANNEL, SPI3_DMA_TX_TRIG_SOURCE);/* Enable DMA. */DMA_Cmd(SPI3_DMA_UNIT, Enable);/* Set DMA block transfer complete IRQ */stcIrqRegiConf.enIRQn      = IRQ_SPI3_DMA_TX;stcIrqRegiConf.pfnCallback = &spi3_tx_dma_tc0_irq_cb;stcIrqRegiConf.enIntSrc    = INT_DMA1_TC0;enIrqRegistration(&stcIrqRegiConf);NVIC_SetPriority(stcIrqRegiConf.enIRQn, IRQ_PRIORITY_SPI3_DMA_TX);NVIC_ClearPendingIRQ(stcIrqRegiConf.enIRQn);NVIC_EnableIRQ(stcIrqRegiConf.enIRQn);
}static void bsp_spi3_init(void)
{stc_spi_init_t stcSpiInit;/* configuration structure initialization */MEM_ZERO_STRUCT(stcSpiInit);/* Configuration peripheral clock */PWC_Fcg1PeriphClockCmd(SPI3_UNIT_CLOCK, Enable);/* Configuration SPI structure */stcSpiInit.enClkDiv                 = SpiClkDiv32;stcSpiInit.enFrameNumber            = SpiFrameNumber1;stcSpiInit.enDataLength             = SpiDataLengthBit8;stcSpiInit.enFirstBitPosition       = SpiFirstBitPositionMSB;stcSpiInit.enSckPolarity            = SpiSckIdleLevelLow;stcSpiInit.enSckPhase               = SpiSckOddSampleEvenChange;stcSpiInit.enReadBufferObject       = SpiReadReceiverBuffer;stcSpiInit.enWorkMode               = SpiWorkMode3Line;stcSpiInit.enTransMode              = SpiTransOnlySend;stcSpiInit.enCommAutoSuspendEn      = Disable;stcSpiInit.enModeFaultErrorDetectEn = Disable;stcSpiInit.enParitySelfDetectEn     = Disable;stcSpiInit.enParityEn               = Disable;stcSpiInit.enParity                 = SpiParityEven;stcSpiInit.enMasterSlaveMode = SpiModeMaster;stcSpiInit.stcDelayConfig.enSsSetupDelayOption   = SpiSsSetupDelayCustomValue;stcSpiInit.stcDelayConfig.enSsSetupDelayTime     = SpiSsSetupDelaySck1;stcSpiInit.stcDelayConfig.enSsHoldDelayOption    = SpiSsHoldDelayCustomValue;stcSpiInit.stcDelayConfig.enSsHoldDelayTime      = SpiSsHoldDelaySck1;stcSpiInit.stcDelayConfig.enSsIntervalTimeOption = SpiSsIntervalCustomValue;stcSpiInit.stcDelayConfig.enSsIntervalTime       = SpiSsIntervalSck1PlusPck2;SPI_Init(SPI3_UNIT, &stcSpiInit);spi3_dma_config();SPI_Cmd(SPI3_UNIT, Enable);   rt_sem_init(&spi3_tx_wait, "spi3tx", 0, RT_IPC_FLAG_FIFO);
}static void lcd_spi_send(uint8_t dat)
{ while (Reset == SPI_GetFlag(SPI3_UNIT, SpiFlagSendBufferEmpty)){;}SPI_SendData8(SPI3_UNIT, dat);while (Reset == SPI_GetFlag(SPI3_UNIT, SpiFlagSpiIdle)){;}
}
/*
static void lcd_spi_trans(uint8_t *dat, uint16_t len)
{DMA_SetSrcAddress (SPI3_DMA_UNIT, SPI3_DMA_TX_CHANNEL, (uint32_t)dat);DMA_SetTransferCnt(SPI3_DMA_UNIT, SPI3_DMA_TX_CHANNEL, len);LCD_CS_L;DMA_ChannelCmd(SPI3_DMA_UNIT, SPI3_DMA_TX_CHANNEL, Enable);SPI_Cmd(SPI3_UNIT, Enable);   rt_sem_take(&spi3_tx_wait, RT_WAITING_FOREVER);LCD_CS_H;SPI_Cmd(SPI3_UNIT, Disable);DMA_ChannelCmd(SPI3_DMA_UNIT, SPI3_DMA_TX_CHANNEL, Disable);
}
*/
static void delayms(uint16_t ms)
{rt_thread_delay(ms);
}static void write_codetable(lcd_code_t *code, uint32_t count)
{lcd_code_t *pcode = code;//传输指令和参数for (uint32_t i = 0; i < count; i++){   if (pcode->reg == LCDCODE_REGFLAG_END){                                   //结束跳出break;}else if (pcode->reg == LCDCODE_REGFLAG_DELAY){                                   //延时MSdelayms(pcode->len);}else{                                   //常规发送指令LCD_A0_L;LCD_CS_L;lcd_spi_send(pcode->reg);for (uint32_t j = 0; j < pcode->len; j++){LCD_A0_H;lcd_spi_send(pcode->dat[j]);}LCD_CS_H;}pcode++;                            //下一个寄存器}
}//初始化指令表
static lcd_code_t st7789v_initcode[] = {
//{0x11,  0, {0x00} },
//{LCDCODE_REGFLAG_DELAY, 120, {0x00}},
//{0xb2,  5, {0x0c, 0x0c, 0x00, 0x33, 0x33} },
//{0xb7,  1, {0x35} },
//{0xbb,  1, {0x35} },
//{0xc0,  1, {0x2c} },
//{0xc2,  1, {0x01} },
//{0xc3,  1, {0x0b} },
//{0xc4,  1, {0x20} },
//{0xc6,  1, {0x0f} },
//{0xd0,  2, {0xa4, 0xa1} },
//{0xe0, 14, {0xd0, 0x00, 0x02, 0x07, 0x0b, 0x1a, 0x32, 0x54, 0x40, 0x29, 0x12, 0x12, 0x12, 0x17} },
//{0xe1, 14, {0xd0, 0x00, 0x02, 0x07, 0x05, 0x25, 0x2d, 0x44, 0x45, 0x1c, 0x18, 0x16, 0x1c, 0x1d} },
//{0x36,  1, {0x00} },
{0x3a,  1, {0x05} },
//{0x29,  0, {0x00} },
{LCDCODE_REGFLAG_END, 0x00, {0x00} }
};/*显示区域设置*/
static lcd_code_t st7789v_blockcode[] = {
{0x2a,  4, {0x00, 0x00, 0x00, 0x00} },
{0x2b,  4, {0x00, 0x00, 0x00, 0x00} },
{0x2c,  0, {0x00} },
{LCDCODE_REGFLAG_END, 0x00, {0x00} }
};static void write_block(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1)
{st7789v_blockcode[0].dat[0] = 0x00;st7789v_blockcode[0].dat[1] = x0;st7789v_blockcode[0].dat[2] = 0x00;st7789v_blockcode[0].dat[3] = x1;st7789v_blockcode[1].dat[0] = y0 >> 8;st7789v_blockcode[1].dat[1] = y0 & 0xff;st7789v_blockcode[1].dat[2] = y1 >> 8;st7789v_blockcode[1].dat[3] = y1 & 0xff;write_codetable(st7789v_blockcode, 5);
}void st7789v_init(void)
{stc_port_init_t stcPortInit;MEM_ZERO_STRUCT(stcPortInit);PWC_Fcg1PeriphClockCmd(SPI3_UNIT_CLOCK, Enable);/* Configuration SPI pin */PORT_SetFunc(SPI3_NSS_PORT, SPI3_NSS_PIN, Func_Gpio,     Disable);    PORT_SetFunc(SPI3_SCK_PORT, SPI3_SCK_PIN, SPI3_SCK_FUNC, Disable);PORT_SetFunc(SPI3_SDI_PORT, SPI3_SDI_PIN, SPI3_SDI_FUNC, Disable);PORT_SetFunc(LCD_RST_PORT,  LCD_RST_PIN,  Func_Gpio,     Disable);PORT_SetFunc(LCD_A0_PORT,   LCD_A0_PIN,   Func_Gpio,     Disable);stcPortInit.enPinMode = Pin_Mode_Out;stcPortInit.enPinDrv  = Pin_Drv_H;PORT_Init(LCD_RST_PORT, LCD_RST_PIN, &stcPortInit);PORT_Init(LCD_A0_PORT,  LCD_A0_PIN,  &stcPortInit);PORT_Init(LCD_CS_PORT,  LCD_CS_PIN,  &stcPortInit);bsp_spi3_init();LCD_RST_H;LCD_A0_H;LCD_CS_H;delayms(10);LCD_RST_L;delayms(10);LCD_RST_H;delayms(120);write_codetable(st7789v_initcode, sizeof(st7789v_initcode)/sizeof(lcd_code_t));
}void st7789v_test(void)
{LCD_RST_H;LCD_A0_H;LCD_CS_H;delayms(10);LCD_RST_L;delayms(10);LCD_RST_H;delayms(120);write_codetable(st7789v_initcode, sizeof(st7789v_initcode)/sizeof(lcd_code_t));delayms(10);//write_block(1, 1, 128, 300);
}

以上代码是测试MCU发送指令0x3a, 参数0x05，SPI发送代码参考HC32F460 DDL库hc32f460_ddl_Rev2.2.0.zip

static void lcd_spi_send(uint8_t dat)
{ while (Reset == SPI_GetFlag(SPI3_UNIT, SpiFlagSendBufferEmpty)){;}SPI_SendData8(SPI3_UNIT, dat);
}LCD_A0_L;LCD_CS_L;lcd_spi_send(pcode->reg);for (uint32_t j = 0; j < pcode->len; j++){LCD_A0_H;lcd_spi_send(pcode->dat[j]);}LCD_CS_H;

每次发送BYTE之前判断SPI BUFFER是否为空，如果空，写入数据，实施证明，BUFFER空，仅仅是BUFFER空，数据还在SPI硬件里发送着，根本就没结束，而且参考手册里面，SPI和发送相关的状态位也就这个BUFFER EMPTY，而不像之前STM，还有一个发送结束COMPLETE状态位。

看下面波形，第一个字节8个CLK还没结束，CS，A0就已经变高了，造成实际传输无效

修改如下：

static void lcd_spi_send(uint8_t dat)
{ while (Reset == SPI_GetFlag(SPI3_UNIT, SpiFlagSendBufferEmpty)){;}SPI_SendData8(SPI3_UNIT, dat);while (Reset == SPI_GetFlag(SPI3_UNIT, SpiFlagSpiIdle)){;}
}LCD_A0_L;LCD_CS_L;lcd_spi_send(pcode->reg);for (uint32_t j = 0; j < pcode->len; j++){LCD_A0_H;lcd_spi_send(pcode->dat[j]);}LCD_CS_H;

每次写数据之前判断BUFFER是否空，每次写数据之后，等待SPI传输结束

波形上已经达到我们时序的要求，所以，直接参考当前库代码，至少对于驱动LCD，是有问题的。

总结

有异常，外设无法工作时候，我们要习惯于分析波形，从时序中排查问题，然后再尝试解决问题。

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HC32F460填坑 - SPI POLLING SEND

HC32F460填坑 - SPI POLLING

总结

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