1. UNIT 26
SPI Test
로봇 SW 교육원
조용수

2. 학습 목표 SPI Sample SPI Read/Write Function SPI loop back Test
MPL115A1 Pressure and Temperature Sensor

3. SPI Sample SPI Loop Back Source
\M051_Series_BSP_CMSIS_Rev \SampleCode\StdDriver\SPI_Loopback\KEIL

4. System Init void SYS_Init(void) { SYS_UnlockReg();
CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HIRC, CLK_CLKDIV_UART(1));
CLK_SetModuleClock(SPI0_MODULE, CLK_CLKSEL1_SPI0_S_HCLK, MODULE_NoMsk);
CLK_EnableModuleClock(UART0_MODULE);
CLK_EnableModuleClock(SPI0_MODULE);
SYS->P3_MFP = SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0;
SYS->P1_MFP = SYS_MFP_P14_SPISS0 | SYS_MFP_P15_MOSI_0 | SYS_MFP_P16_MISO_0 | SYS_MFP_P17_SPICLK0;
SYS_LockReg();
SystemCoreClockUpdate(); }

5. System Init void SPI_Init(void) {
/* Configure as a master, clock idle low, 32-bit transaction, drive output on falling clock edge and latch input on rising edge. */
/* Set IP clock divider. SPI clock rate = 2MHz */
SPI_Open(SPI0, SPI_MASTER, SPI_MODE_0, 32, );
/* Enable the automatic hardware slave select function. Select the SS pin and configure as low-active. */
SPI_EnableAutoSS(SPI0, SPI_SS, SPI_SS_ACTIVE_LOW); }

6. System Init while(1) { /* Write to TX register */
SPI_WRITE_TX0(SPI0, g_au32SourceData[u32DataCount]);
/* Trigger SPI data transfer */
SPI_TRIGGER(SPI0);
/* Check SPI0 bust status */
while(SPI_IS_BUSY(SPI0));
/* Read received data */
g_au32DestinationData[u32DataCount] = SPI_READ_RX0(SPI0);
u32DataCount++;
if(u32DataCount > TEST_COUNT)
break; }

7. System Init while(1) { /* Write to TX register */
SPI_WRITE_TX0(SPI0, g_au32SourceData[u32DataCount]);
/* Trigger SPI data transfer */
SPI_TRIGGER(SPI0);
/* Check SPI0 bust status */
while(SPI_IS_BUSY(SPI0));
/* Read received data */
g_au32DestinationData[u32DataCount] = SPI_READ_RX0(SPI0);
u32DataCount++;
if(u32DataCount > TEST_COUNT)
break; }

8. MPL115A1
Digitized pressure and temperature information together with programmed calibration coefficients for host micro use.
Factory calibrated
50 kPa to 115 kPa absolute pressure
±1 kPa accuracy
2.375V to 5.5V supply
Integrated ADC
SPI Interface
Monotonic pressure and temperature data outputs
Surface mount RoHS compliant package

9. MPL115A1

10. MPL115A1

11. MPL115A1 SPI Command

12. System Init void SPI_Init(void) {
/* Configure as a master, clock idle low, 32-bit transaction, drive output on falling clock edge and latch input on rising edge. */
/* Set IP clock divider. SPI clock rate = 2MHz */
SPI_Open(SPI0, SPI_MASTER, SPI_MODE_0, 8, );
/* Enable the automatic hardware slave select function. Select the SS pin and configure as low-active. */
SPI_EnableAutoSS(SPI0, SPI_SS, SPI_SS_ACTIVE_LOW); }

13. MPL115A1 void writeSPI(char address , char data ) { int count = 1000;
SPI_SET_SS_LOW(SPI0);
while(count--);
/* Write to TX register */
SPI_WRITE_TX0(SPI0, address);
/* Trigger SPI data transfer */
SPI_TRIGGER(SPI0);
/* Check SPI0 bust status */
while(SPI_IS_BUSY(SPI0));
SPI_WRITE_TX0(SPI0, data);
SPI_SET_SS_HIGH(SPI0); }

14. MPL115A1 char readSPI(char address) { char read; int count = 1000;
SPI_SET_SS_LOW(SPI0);
while(count--);
SPI_WRITE_TX0(SPI0, address);
SPI_TRIGGER(SPI0);
while(SPI_IS_BUSY(SPI0));
SPI_WRITE_TX0(SPI0, 0x00);
read = SPI_READ_RX0(SPI0);
SPI_SET_SS_HIGH(SPI0);
return read; }

15. MPL115A1 #define NWS_BARO 30.04 #define PRESH 0x80 // 80
#define PRESL 0x82 // 82
#define TEMPH 0x84 // 84
#define TEMPL 0x86 // 86
#define A0MSB 0x88 // 88
#define A0LSB 0x8A // 8A
#define B1MSB 0x8C // 8C
#define B1LSB 0x8E // 8E
#define B2MSB 0x90 // 90
#define B2LSB 0x92 // 92
#define C12MSB 0x94 // 94
#define C12LSB 0x96 // 96
#define C11MSB 0x98 // 98
#define C11LSB 0x9A // 9A
#define C22MSB 0x9C // 9C
#define C22LSB 0x9E // 9E

16. MPL115A1 float A0; float B1; float B2; float C12;
void readMPL115A1_Coefficients() {
int A0H, A0L, B1H, B1L, B2H, B2L, C12H, C12L;
A0H = readSPI(A0MSB);
A0L = readSPI(A0LSB);
A0 = (A0H << 5) + (A0L >> 3) + (A0L & 0x07) / 8.0;
B1H = readSPI(B1MSB);
B1L = readSPI(B1LSB);
B1 = ((((B1H & 0x1F ) * 0x100) + B1L) / ) - 3;
B2H = readSPI(B2MSB);
B2L = readSPI(B2LSB);
B2 = ((((B2H - 0x80 ) << 8) + B2L) / ) - 2;
C12H = readSPI(C12MSB);
C12L = readSPI(C12LSB);
C12 = (((C12H * 0x100 ) + C12L) / ) ; }

17. MPL115A1 float readMPL115A1() { int count = 30000;
unsigned char uiPH, uiPL;
float press = 0.0;
float pressure = 0.0;
float presKPa = 0.0;
float temp = 0.0;
unsigned int uiTadc;
unsigned char uiTH, uiTL;
unsigned int temperature_counts = 0;
writeSPI(0x24, 0x00); // Start temperature conversion
while(count--);
// Read pressure
uiTH = readSPI(TEMPH);
uiTL = readSPI(TEMPL);
uiPH = readSPI(PRESH);
uiPL = readSPI(PRESL);
printf("Read MPL115A1 0x%x, 0x%x \n", uiTH, uiTL);
printf("Read MPL115A1 0x%x, 0x%x \n", uiPH, uiPL);
uiTadc = (unsigned int) uiTH << 8;
uiTadc += (unsigned int) uiTL & 0x00FF;
// Temperature is a 10bit value
uiTadc = uiTadc >> 6;
// counts per °C, 472 counts is 25°C
temp = (uiTadc - 472) / -5.35;
printf("Temperature %f \n", temp);
press = ((uiPH * 256 ) + uiPL) / 64;
temp = ((uiTH * 256) + uiTH) / 64;
pressure = A0 + (B1 + C12 * temp) * press + B2 * temp;
presKPa = pressure * (65.0/1023.0) ;
printf("Pressure %f , Pressure(KPa) %f \n", pressure, presKPa); }

18. MPL115A1 uiTadc = (unsigned int) uiTH << 8;
uiTadc += (unsigned int) uiTL & 0x00FF;
// Temperature is a 10bit value
uiTadc = uiTadc >> 6;
// counts per °C, 472 counts is 25°C
temp = (uiTadc - 472) / -5.35;
printf("Temperature %f \n", temp);
press = ((uiPH * 256 ) + uiPL) / 64;
temp = ((uiTH * 256) + uiTH) / 64;
pressure = A0 + (B1 + C12 * temp) * press + B2 * temp;
presKPa = pressure * (65.0/1023.0) ;
printf("Pressure %f , Pressure(KPa) %f \n", pressure, presKPa); }