Sean Burford / i2c_pullup

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Dependencies:   max32625pico maxim-dev mbed-rtos USBDevice

Fork of PICO_USB_I2C_SPI by Greg Steiert

main.cpp@16:847788f907eb, 2017-11-24 (annotated)

Committer:
seanburford
Date:
Fri Nov 24 05:37:12 2017 +0000
Revision:
16:847788f907eb
Parent:
15:9801f08ce0ee
Child:
17:43cc59f768af
Remove excess code

Who changed what in which revision?

UserRevisionLine numberNew contents of line
switches 0:60a522ae2e35 1 #include "mbed.h"
switches 13:fed6ff32bf5d 2 #include "rtos.h"
switches 3:aa55728c8e09 3
seanburford 14:7a4b0f9d1474 4 #include "gpio_api.h"
seanburford 14:7a4b0f9d1474 5 #include "max32625pico.h"
seanburford 15:9801f08ce0ee 6 #include "pwrman_regs.h"
switches 5:2436ae0a9eb1 7
seanburford 14:7a4b0f9d1474 8 static DigitalOut rLED(LED1);
seanburford 14:7a4b0f9d1474 9 static DigitalOut gLED(LED2);
seanburford 14:7a4b0f9d1474 10 static DigitalOut bLED(LED3);
switches 5:2436ae0a9eb1 11
seanburford 16:847788f907eb 12 int gpioAlternatePullup(PinName name) {
seanburford 16:847788f907eb 13 // Enable high resistance pullups per AN6350 section 5.2.4.1
seanburford 15:9801f08ce0ee 14 int result = E_NO_ERROR;
seanburford 16:847788f907eb 15 unsigned int port = PINNAME_TO_PORT(name);
seanburford 16:847788f907eb 16 unsigned int pin = PINNAME_TO_PIN(name);
seanburford 16:847788f907eb 17 MXC_IOMAN->wud_req0 |= ((1 << pin) << (port << 3)); // pinmask
seanburford 15:9801f08ce0ee 18 if (MXC_IOMAN->wud_ack0 != MXC_IOMAN->wud_req0) {
seanburford 15:9801f08ce0ee 19 result = E_BUSY;
seanburford 15:9801f08ce0ee 20 }
seanburford 15:9801f08ce0ee 21 if (result == E_NO_ERROR) {
seanburford 15:9801f08ce0ee 22 MXC_PWRMAN->wud_ctrl = MXC_F_PWRMAN_WUD_CTRL_CTRL_ENABLE;
seanburford 16:847788f907eb 23 MXC_PWRMAN->wud_ctrl |= (port * 8) + pin; // Pad select
seanburford 15:9801f08ce0ee 24 MXC_PWRMAN->wud_ctrl &= ~(MXC_F_PWRMAN_WUD_CTRL_PAD_MODE);
seanburford 16:847788f907eb 25 MXC_PWRMAN->wud_ctrl |= (MXC_E_PWRMAN_PAD_MODE_WEAK_HI_LO <<
seanburford 16:847788f907eb 26 MXC_F_PWRMAN_WUD_CTRL_PAD_MODE_POS);
seanburford 15:9801f08ce0ee 27 MXC_PWRMAN->wud_pulse0 = 1;
seanburford 15:9801f08ce0ee 28 }
seanburford 15:9801f08ce0ee 29 MXC_PWRMAN->wud_ctrl = 0;
seanburford 15:9801f08ce0ee 30 MXC_IOMAN->wud_req0 = 0;
seanburford 15:9801f08ce0ee 31 return result;
seanburford 15:9801f08ce0ee 32 }
seanburford 15:9801f08ce0ee 33
switches 0:60a522ae2e35 34 int main()
switches 0:60a522ae2e35 35 {
switches 2:57500e991166 36 rLED = LED_ON;
switches 2:57500e991166 37 gLED = LED_ON;
switches 2:57500e991166 38 bLED = LED_OFF;
switches 3:aa55728c8e09 39
seanburford 14:7a4b0f9d1474 40 MAX32625PICO pico(
seanburford 14:7a4b0f9d1474 41 MAX32625PICO::IOH_3V3, MAX32625PICO::VIO_IOH, MAX32625PICO::VIO_IOH);
switches 0:60a522ae2e35 42
seanburford 16:847788f907eb 43 gpioAlternatePullup(P1_6);
seanburford 16:847788f907eb 44 gpioAlternatePullup(P1_7);
seanburford 14:7a4b0f9d1474 45
seanburford 14:7a4b0f9d1474 46 I2C i2c(P1_6, P1_7);
seanburford 16:847788f907eb 47 i2c.frequency(100000);
switches 2:57500e991166 48
switches 2:57500e991166 49 rLED = LED_OFF;
seanburford 14:7a4b0f9d1474 50 gLED = LED_OFF;
switches 5:2436ae0a9eb1 51
seanburford 14:7a4b0f9d1474 52 char dbuf[32];
switches 1:6923b075c8d7 53 while(1) {
seanburford 14:7a4b0f9d1474 54 Thread::wait(15);
seanburford 14:7a4b0f9d1474 55 if (i2c.read(0x55, dbuf, 8) == 0) {
seanburford 14:7a4b0f9d1474 56 gLED = !gLED;
seanburford 14:7a4b0f9d1474 57 } else {
seanburford 14:7a4b0f9d1474 58 rLED = !rLED;
seanburford 14:7a4b0f9d1474 59 }
switches 0:60a522ae2e35 60 }
seanburford 16:847788f907eb 61 }