Added RPI-Pico IO wrapper

2026-04-29 13:43:26 -07:00 · 2024-09-27 18:40:33 +01:00
parent 77955a604f
commit 9e7be62678
1 changed files with 158 additions and 0 deletions
@@ -0,0 +1,158 @@
+//
+// bb_epaper I/O wrapper for the Raspberry Pi Pico
+// Copyright (c) 2020 BitBank Software, Inc.
+// Written by Larry Bank (bitbank@pobox.com)
+// Project started 9/26/2024
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//    http://www.apache.org/licenses/LICENSE-2.0
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+#ifndef __PICO_IO__
+#define __PICO_IO__
+#define PROGMEM
+#define memcpy_P memcpy
+#define pgm_read_byte(a) *(uint8_t *)a
+#define pgm_read_word(a) *(uint16_t *)a
+#define false 0
+#define true 1
+#define LOW 0
+#define HIGH 1
+#ifndef I2C_SLAVE
+#define I2C_SLAVE 0
+#define INPUT 0
+#define OUTPUT 1
+#define INPUT_PULLUP 2
+#define HIGH 1
+#define LOW 0
+#endif
+// forward references
+void bbepWakeUp(BBEPDISP *pBBEP);
+static void digitalWrite(int iPin, int iState) {
+   gpio_put(iPin, iState);
+}
+static void pinMode(int iPin, int iMode)
+{
+  gpio_set_function(iPin,   GPIO_FUNC_SIO);
+  if (iMode == INPUT || iMode == INPUT_PULLUP) {
+      gpio_set_dir(iPin, GPIO_IN);
+      if (iMode == INPUT_PULLUP) {
+        gpio_pull_up(iPin);
+      }
+  } else if (iMode == OUTPUT) {
+      gpio_set_dir(iPin, GPIO_OUT);
+  }
+} /* pinMode() */
+
+static void delayMicroseconds(int iTime)
+{
+	sleep_us(iTime);
+} /* delayMicroseconds() */
+static int digitalRead(int iPin)
+{
+  return gpio_get(iPin);
+} /* digitalRead() */
+
+static void delay(int iTime)
+{
+  delayMicroseconds(iTime * 1000);
+}
+
+// Initialize SPI and epaper I/O
+void bbepInitIO(BBEPDISP *pBBEP, uint8_t u8DC, uint8_t u8RST, uint8_t u8BUSY, uint8_t u8CS, uint8_t u8MOSI, uint8_t u8SCK, uint32_t u32Speed)
+{
+    pBBEP->iDCPin = u8DC;
+    pBBEP->iCSPin = u8CS;
+//    pBBEP->iMOSIPin = u8MOSI;
+//    pBBEP->iCLKPin = u8SCK;
+    pBBEP->iRSTPin = u8RST;
+    pBBEP->iBUSYPin = u8BUSY;
+    pinMode(pBBEP->iCSPin, OUTPUT);
+    digitalWrite(pBBEP->iCSPin, HIGH);
+    pinMode(pBBEP->iDCPin, OUTPUT);
+    pinMode(pBBEP->iRSTPin, OUTPUT);
+    digitalWrite(pBBEP->iRSTPin, LOW);
+    delay(100);
+    digitalWrite(pBBEP->iRSTPin, HIGH);
+    delay(100);
+    if (pBBEP->iBUSYPin != 0xff) {
+        pinMode(pBBEP->iBUSYPin, INPUT);
+    }
+
+    spi_init(spi0, u32Speed);
+//    gpio_set_function(iMISO, GPIO_FUNC_SPI);
+//    gpio_set_function(u8CS,   GPIO_FUNC_SIO);
+    gpio_set_function(PIN_SCK,  GPIO_FUNC_SPI);
+    gpio_set_function(PIN_MOSI, GPIO_FUNC_SPI);
+} /* bbepInitIO() */
+
+void I2CInit(uint32_t iSpeed)
+{
+   // I2C Initialisation. Using it at 400Khz.
+    i2c_init(i2c0, iSpeed);
+    
+    gpio_set_function(I2C_SDA, GPIO_FUNC_I2C);
+    gpio_set_function(I2C_SCL, GPIO_FUNC_I2C);
+    gpio_pull_up(I2C_SDA);
+    gpio_pull_up(I2C_SCL);
+ }
+
+static void bbepWriteData(BBEPDISP *pBBEP, uint8_t *pData, int iLen)
+{
+      digitalWrite(pBBEP->iCSPin, LOW);
+      spi_write_blocking(spi0, pData, iLen);
+      digitalWrite(pBBEP->iCSPin, HIGH);
+} /* bbepWriteData() */
+//
+// Convenience function to write a command byte along with a data
+// byte (it's single parameter)
+//
+void bbepCMD2(BBEPDISP *pBBEP, uint8_t cmd1, uint8_t cmd2)
+{
+    if (!pBBEP->is_awake) {
+        // if it's asleep, it can't receive commands
+        bbepWakeUp(pBBEP);
+        pBBEP->is_awake = 1;
+    }
+    digitalWrite(pBBEP->iDCPin, LOW);
+    digitalWrite(pBBEP->iCSPin, LOW);
+    spi_write_blocking(spi0, &cmd1, 1);
+    digitalWrite(pBBEP->iDCPin, HIGH);
+    spi_write_blocking(spi0, &cmd2, 1); // second byte is data
+    digitalWrite(pBBEP->iCSPin, HIGH);
+    digitalWrite(pBBEP->iDCPin, HIGH); // leave data mode as the default
+} /* bbepCMD2() */ 
+
+// 
+// Write a single byte as a COMMAND (D/C set low)
+// 
+void bbepWriteCmd(BBEPDISP *pBBEP, uint8_t cmd)
+{
+    if (!pBBEP->is_awake) { 
+        // if it's asleep, it can't receive commands
+        bbepWakeUp(pBBEP);
+        pBBEP->is_awake = 1;
+    }
+    digitalWrite(pBBEP->iDCPin, LOW);
+    digitalWrite(pBBEP->iCSPin, LOW);
+    spi_write_blocking(spi0, &cmd, 1);
+    digitalWrite(pBBEP->iCSPin, HIGH);
+    digitalWrite(pBBEP->iDCPin, HIGH); // leave data mode as the default
+} /* bbepWriteCmd() */
+
+long millis(void)
+{
+  return time_us_32() / 1000;
+}
+long micros(void)
+{
+  return time_us_32();
+}
+
+#endif // __PICO_IO__