【庆典三：项目速成设计】LPC4330硬件SPI驱动OLED

eefocus_3816359 · 发表于 2024-12-27 19:32:08

【LPC4330用户手册】外设库中有个SSP1的例程，学习一下能否用于驱动OLED：

初始化SSP1的Pin：

如下图所示，SSP1的4个引脚均引出到J1连接器。

oid OLED_WR_Byte(u8 dat,u8 cmd)
{
// u8 i;
if(cmd)
OLED_DC_Set();
else
OLED_DC_Clr();
OLED_CS_Clr();
//SPI0_ByteExchange(dat); /* AVR64DD32 Exchange data */
LPC_SSP1->DR = dat; //Chip_SSP_SendFrame(LPC_SSP1, dat);
while ((Chip_SSP_GetStatus(LPC_SSP1, SSP_STAT_RNE) != SET)){
;
}
//DEBUGOUT("\r\nWrite 1 Byte : %x Done\n\r", dat);
Chip_SSP_ReceiveFrame(LPC_SSP1);
OLED_CS_Set();
OLED_DC_Set();
}

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关于RES和DC引脚：

RES：P6-5 即GPIO3[4]

DC: P6-1 即GPIO3[0]

OLED屏幕没有任何反应，于是考虑是否ＲＥＳ，ＤＣ等引脚并没有起作用。通过简单的翻转IO引脚也无法测试出电平变换，有点问题。

另外，也顺便测试了一下J2连接器上的P1_6, P1_9,P1_12以及P1_10引脚的GPIO功能，测试结果正常，梅林雀可以观测到方波。

#if 1

Chip_GPIO_SetPinDIROutput(LPC_GPIO_PORT,1, 9);

Chip_GPIO_SetPinState(LPC_GPIO_PORT,1, 9, (bool) TRUE );

Chip_GPIO_SetPinDIROutput(LPC_GPIO_PORT,1, 2); //RES P6-5 : GPIO3[4]

Chip_GPIO_SetPinState(LPC_GPIO_PORT,1, 2, (bool) TRUE );

Chip_GPIO_SetPinDIROutput(LPC_GPIO_PORT,1, 5); //RES P6-5 : GPIO3[4]

Chip_GPIO_SetPinState(LPC_GPIO_PORT,1, 5, (bool) TRUE );

Chip_GPIO_SetPinDIROutput(LPC_GPIO_PORT,1, 3); //RES P6-5 : GPIO3[4]

Chip_GPIO_SetPinState(LPC_GPIO_PORT,1, 3, (bool) TRUE );

while(1){

Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT,1, 9);

Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT,1, 2);

Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT,1, 5);

Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT,1, 3);

Delay_ms(50);

Chip_GPIO_SetPinOutLow(LPC_GPIO_PORT,1, 9);

Chip_GPIO_SetPinOutLow(LPC_GPIO_PORT,1, 2);

Chip_GPIO_SetPinOutLow(LPC_GPIO_PORT,1, 5);

Chip_GPIO_SetPinOutLow(LPC_GPIO_PORT,1, 3);

Delay_ms(50);

}

#endif

接下来神奇的事情发生了，把OLED的VCC跟GND连接到LPC4330Xpressso开发板的另一个连接器上，然后屏幕开始缓慢刷新了。速度非常慢，考虑可能是SSP的时钟只有100K，后来改成了1M，速度还是可以的！

附主程序代码：

/*
* @brief Blinky example using sysTick
*
* @note
*
* @par
* Software that is described herein is for illustrative purposes only
* which provides customers with programming information regarding the
* LPC products. This software is supplied "AS IS" without any warranties of
* any kind, and NXP Semiconductors and its licensor disclaim any and
* all warranties, express or implied, including all implied warranties of
* merchantability, fitness for a particular purpose and non-infringement of
* intellectual property rights. NXP Semiconductors assumes no responsibility
* or liability for the use of the software, conveys no license or rights under any
* patent, copyright, mask work right, or any other intellectual property rights in
* or to any products. NXP Semiconductors reserves the right to make changes
* in the software without notification. NXP Semiconductors also makes no
* representation or warranty that such application will be suitable for the
* specified use without further testing or modification.
*
* @par
* Permission to use, copy, modify, and distribute this software and its
* documentation is hereby granted, under NXP Semiconductors' and its
* licensor's relevant copyrights in the software, without fee, provided that it
* is used in conjunction with NXP Semiconductors microcontrollers. This
* copyright, permission, and disclaimer notice must appear in all copies of
* this code.
*/
#include "board.h"
#include "oled/oled.h"
/*****************************************************************************
* Private types/enumerations/variables
****************************************************************************/
#define TICKRATE_HZ (1000) /* 1000 ticks per second */
/*****************************************************************************
* Public types/enumerations/variables
****************************************************************************/
#define LPC_SSP LPC_SSP1
#define BUFFER_SIZE (0x100)
#define SSP_DATA_BITS (SSP_BITS_8)
#define SSP_DATA_BIT_NUM(databits) (databits+1)
#define SSP_DATA_BYTES(databits) (((databits) > SSP_BITS_8) ? 2:1)
#define SSP_LO_BYTE_MSK(databits) ((SSP_DATA_BYTES(databits) > 1) ? 0xFF:(0xFF>>(8-SSP_DATA_BIT_NUM(databits))))
#define SSP_HI_BYTE_MSK(databits) ((SSP_DATA_BYTES(databits) > 1) ? (0xFF>>(16-SSP_DATA_BIT_NUM(databits))):0)
#define SSP_MODE_SEL (0x31)
#define SSP_TRANSFER_MODE_SEL (0x32)
#define SSP_MASTER_MODE_SEL (0x31)
#define SSP_SLAVE_MODE_SEL (0x32)
#define SSP_POLLING_SEL (0x31)
#define SSP_INTERRUPT_SEL (0x32)
#define SSP_DMA_SEL (0x33)
static SSP_ConfigFormat ssp_format;
/*****************************************************************************
* Private functions
****************************************************************************/
/*****************************************************************************
* Public functions
****************************************************************************/
/**
* @brief Handle interrupt from SysTick timer
* @return Nothing
*/
static volatile uint32_t tick_ct = 0;
static uint8_t RGB_ON_OFF = 0;
void SysTick_Handler(void)
{
tick_ct += 1;
if ((tick_ct % 1000) == 0) {
//Board_LED_Toggle(0);
//Chip_GPIO_SetPinToggle(LPC_GPIO_PORT, 3, 5);
switch(RGB_ON_OFF%3){
case 0:
Chip_GPIO_SetPinOutLow(LPC_GPIO_PORT, 3, 7);
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 0, 7);
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 3, 5);
break;
case 1:
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 3, 7);
Chip_GPIO_SetPinOutLow(LPC_GPIO_PORT, 0, 7);
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 3, 5);
break;
case 2:
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 3, 7);
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 0, 7);
Chip_GPIO_SetPinOutLow(LPC_GPIO_PORT, 3, 5);
break;
default:
break;
}//end--> switch-case
RGB_ON_OFF++;
}//end--> if statement
}
void Delay_ms(uint32_t N_ms){
uint32_t start_cnt = tick_ct;
while((tick_ct - start_cnt) <= N_ms){
;
}
}
void RGB_LED_Blinky_with_Delay(uint32_t Nms_Delay){
/* P6.11 GPIO3[7] : LED green as output */
/* P2_7 GPIO0[7] : LED green as output */
/* P6.9 GPIO3[5] : LED blue as output */
//Red On, Green & Blue Off
Chip_GPIO_SetPinOutLow(LPC_GPIO_PORT, 3, 7);
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 0, 7);
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 3, 5);
Delay_ms(Nms_Delay);
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 3, 7);
Chip_GPIO_SetPinOutLow(LPC_GPIO_PORT, 0, 7);
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 3, 5);
Delay_ms(Nms_Delay);
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 3, 7);
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 0, 7);
Chip_GPIO_SetPinOutLow(LPC_GPIO_PORT, 3, 5);
Delay_ms(Nms_Delay);
//Turn off R,G,B LEDs
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 3, 7);
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 0, 7);
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 3, 5);
Delay_ms(Nms_Delay);
}
/**
* @brief main routine for blinky example
* @return Function should not exit.
*/
int main(void)
{
SystemCoreClockUpdate();
Board_Init();
/* Enable and setup SysTick Timer at a periodic rate */
SysTick_Config(SystemCoreClock / TICKRATE_HZ);
RGB_LED_Blinky_with_Delay(500);
/* SSP initialization */
Board_SSP_Init(LPC_SSP);
Chip_SSP_Init(LPC_SSP);
DEBUGOUT("\r\nBoard_SSP and Chip_SSP Init Done\n\r");
ssp_format.frameFormat = SSP_FRAMEFORMAT_SPI;
ssp_format.bits = SSP_DATA_BITS;
ssp_format.clockMode = SSP_CLOCK_MODE0;
Chip_SSP_SetFormat(LPC_SSP, ssp_format.bits, ssp_format.frameFormat, ssp_format.clockMode);
Chip_SSP_Enable(LPC_SSP);
Chip_SSP_SetMaster(LPC_SSP, 1);
DEBUGOUT("\r\nMaster Mode\n\r");
/* oled Initialization*/
OLED_Init();
DEBUGOUT("\r\nOLED Init Done\n\r");
while (1) {
//__WFI();
OLED_BMP_TEST();
}
}
void GPIO_TEST(void){
#if 0
Chip_SCU_ClockPinMuxSet(0, (SCU_PINIO_FAST | SCU_MODE_FUNC1)); /* CLK0 connected to CLK SCU_MODE_FUNC6=SSP1 CLK1 */
//J1 P1_3 MISO
Chip_GPIO_SetPinDIROutput(LPC_GPIO_PORT, 0, 10);
Chip_GPIO_SetPinState(LPC_GPIO_PORT, 0, 10, (bool) TRUE );
//J1 P1_4 MOSI
Chip_GPIO_SetPinDIROutput(LPC_GPIO_PORT, 0, 11);
Chip_GPIO_SetPinState(LPC_GPIO_PORT, 0, 11, (bool) TRUE );
//J1 P1_5 SSEL
Chip_GPIO_SetPinDIROutput(LPC_GPIO_PORT, 1, 8);
Chip_GPIO_SetPinState(LPC_GPIO_PORT, 1, 8, (bool) TRUE );
//J1 P6_5 Simulate RES Pin
Chip_GPIO_SetPinDIROutput(LPC_GPIO_PORT, 3, 4);
Chip_GPIO_SetPinState(LPC_GPIO_PORT, 3, 4, (bool) TRUE );
//J2 P1_6
Chip_GPIO_SetPinDIROutput(LPC_GPIO_PORT, 1, 9);
Chip_GPIO_SetPinState(LPC_GPIO_PORT, 1, 9, (bool) TRUE );
//J2 P1_9
Chip_GPIO_SetPinDIROutput(LPC_GPIO_PORT, 1, 2); //RES P6-5 : GPIO3[4]
Chip_GPIO_SetPinState(LPC_GPIO_PORT, 1, 2, (bool) TRUE );
Chip_GPIO_SetPinDIROutput(LPC_GPIO_PORT, 1, 5); //RES P6-5 : GPIO3[4]
Chip_GPIO_SetPinState(LPC_GPIO_PORT, 1, 5, (bool) TRUE );
Chip_GPIO_SetPinDIROutput(LPC_GPIO_PORT, 1, 3); //RES P6-5 : GPIO3[4]
Chip_GPIO_SetPinState(LPC_GPIO_PORT, 1, 3, (bool) TRUE );
while(1){
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 0, 10);
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 0, 11);
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 1, 8);
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 3, 4); //RES
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 1, 9);
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 1, 2);
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 1, 5);
Chip_GPIO_SetPinOutHigh(LPC_GPIO_PORT, 1, 3);
Delay_ms(50);
Chip_GPIO_SetPinOutLow(LPC_GPIO_PORT, 0, 10);
Chip_GPIO_SetPinOutLow(LPC_GPIO_PORT, 0, 11);
Chip_GPIO_SetPinOutLow(LPC_GPIO_PORT, 1, 8);
Chip_GPIO_SetPinOutLow(LPC_GPIO_PORT, 3, 4); //RES
Chip_GPIO_SetPinOutLow(LPC_GPIO_PORT, 1, 9);
Chip_GPIO_SetPinOutLow(LPC_GPIO_PORT, 1, 2);
Chip_GPIO_SetPinOutLow(LPC_GPIO_PORT, 1, 5);
Chip_GPIO_SetPinOutLow(LPC_GPIO_PORT, 1, 3);
Delay_ms(50);
}
#endif
}

复制代码

完整代码：

periph_blinky_spi_test_v_1.0.zip (435.49 KB, 下载次数: 0)

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