From de4c45eba479c6a9b63c32748941ef13fef2ac4c Mon Sep 17 00:00:00 2001
From: Eric Brombaugh <ebrombaugh1@cox.net>
Date: Thu, 6 Apr 2023 22:58:34 -0700
Subject: [PATCH] Debugging - why can't it send more than 2 bytes?
---
examples/i2c_oled/i2c_oled.c | 2 +
examples/i2c_oled/oled.h | 114 ++++++++++++++++++++++++++++++++---
2 files changed, 106 insertions(+), 10 deletions(-)
diff --git a/examples/i2c_oled/i2c_oled.c b/examples/i2c_oled/i2c_oled.c
index f5d4286..f50e4c4 100644
--- a/examples/i2c_oled/i2c_oled.c
+++ b/examples/i2c_oled/i2c_oled.c
@@ -25,6 +25,8 @@ int main()
// init i2c and oled
printf("initializing i2c oled...");
oled_init();
+ memset(oled_buffer, 0x88, sizeof(oled_buffer));
+ oled_refresh();
printf("done.\n\r");
printf("looping...\n\r");
diff --git a/examples/i2c_oled/oled.h b/examples/i2c_oled/oled.h
index 693eac6..fae3e80 100644
--- a/examples/i2c_oled/oled.h
+++ b/examples/i2c_oled/oled.h
@@ -10,7 +10,7 @@
#include <string.h>
// I2C clock rate
-#define I2C_CLKRATE 80000
+#define I2C_CLKRATE 100000
// OLED I2C address
#define OLED_ADDR 0x3c
@@ -64,7 +64,7 @@ void i2c_init(void)
I2C1->CTLR1 |= I2C_CTLR1_ACK;
// is this needed for a master?
- I2C1->OADDR1 = 2;
+ I2C1->OADDR1 = OLED_ADDR;
}
/*
@@ -91,11 +91,86 @@ uint8_t i2c_chk_evt(uint32_t event_mask)
return (status & event_mask) == event_mask;
}
+/*
+ * common packet send
+ */
+void i2c_send(uint8_t *data, uint8_t sz)
+{
+ int32_t timeout;
+
+ // wait for not busy
+ timeout = TIMEOUT_MAX;
+ while((I2C1->STAR2 & I2C_STAR2_BUSY) && (timeout--));
+ if(timeout==-1)
+ {
+ printf("i2c_send - timeout waiting for not busy\n\r");
+ i2c_error();
+ return;
+ }
+
+ // Set START condition
+ I2C1->CTLR1 |= I2C_CTLR1_START;
+
+ // wait for master mode select
+ timeout = TIMEOUT_MAX;
+ while((!i2c_chk_evt(I2C_EVENT_MASTER_MODE_SELECT)) && (timeout--));
+ if(timeout==-1)
+ {
+ printf("i2c_send - timeout waiting for master mode\n\r");
+ i2c_error();
+ return;
+ }
+
+ // send 7-bit address + write flag
+ I2C1->DATAR = OLED_ADDR<<1;
+
+ // wait for transmit condition
+ timeout = TIMEOUT_MAX;
+ while((!i2c_chk_evt(I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)) && (timeout--));
+ if(timeout==-1)
+ {
+ printf("i2c_send - timeout waiting for transmit mode\n\r");
+ i2c_error();
+ return;
+ }
+
+ // send data one byte at a time
+ while(sz--)
+ {
+ // wait for TX Empty
+ timeout = TIMEOUT_MAX;
+ while(!(I2C1->STAR1 & I2C_STAR1_TXE) && (timeout--));
+ if(timeout==-1)
+ {
+ printf("i2c_send :%d - timeout waiting for tx empty\n\r", sz);
+ i2c_error();
+ return;
+ }
+
+ // send command
+ I2C1->DATAR = *data++;
+ }
+
+ // wait for tx complete
+ timeout = TIMEOUT_MAX;
+ while((!i2c_chk_evt(I2C_EVENT_MASTER_BYTE_TRANSMITTED)) && (timeout--));
+ if(timeout==-1)
+ {
+ printf("i2c_send - timeout waiting for byte transmitted\n\r");
+ i2c_error();
+ return;
+ }
+
+ // set STOP condition
+ I2C1->CTLR1 |= I2C_CTLR1_STOP;
+}
+
/*
* send OLED command byte
*/
void oled_cmd(uint8_t cmd)
{
+#if 0
int32_t timeout;
// wait for not busy
@@ -122,7 +197,7 @@ void oled_cmd(uint8_t cmd)
}
// send 7-bit address + write flag
- I2C1->DATAR = OLED_ADDR<<1;
+ I2C1->DATAR = OLED_ADDR << 1;
// wait for transmit condition
timeout = TIMEOUT_MAX;
@@ -172,6 +247,13 @@ void oled_cmd(uint8_t cmd)
// set STOP condition
I2C1->CTLR1 |= I2C_CTLR1_STOP;
+#else
+ uint8_t pkt[2];
+
+ pkt[0] = 0;
+ pkt[1] = cmd;
+ i2c_send(pkt, 2);
+#endif
}
/*
@@ -179,6 +261,7 @@ void oled_cmd(uint8_t cmd)
*/
void oled_data(uint8_t *data, uint8_t sz)
{
+#if 1
int32_t timeout;
// max 32 bytes
@@ -225,7 +308,7 @@ void oled_data(uint8_t *data, uint8_t sz)
while(!(I2C1->STAR1 & I2C_STAR1_TXE) && (timeout--));
if(timeout==-1)
{
- printf("oled_data - timeout waiting for tx empty\n\r");
+ printf("oled_data H - timeout waiting for tx empty\n\r");
i2c_error();
return;
}
@@ -241,7 +324,7 @@ void oled_data(uint8_t *data, uint8_t sz)
while(!(I2C1->STAR1 & I2C_STAR1_TXE) && (timeout--));
if(timeout==-1)
{
- printf("oled_cmd - timeout waiting for tx empty\n\r");
+ printf("oled_data P:%d - timeout waiting for tx empty\n\r", sz);
i2c_error();
return;
}
@@ -249,7 +332,7 @@ void oled_data(uint8_t *data, uint8_t sz)
// send command
I2C1->DATAR = *data++;
}
-
+
// wait for tx complete
timeout = TIMEOUT_MAX;
while((!i2c_chk_evt(I2C_EVENT_MASTER_BYTE_TRANSMITTED)) && (timeout--));
@@ -262,6 +345,16 @@ void oled_data(uint8_t *data, uint8_t sz)
// set STOP condition
I2C1->CTLR1 |= I2C_CTLR1_STOP;
+#else
+ uint8_t pkt[33];
+
+ // max 32 bytes
+ sz = sz > 32 ? 32 : sz;
+
+ pkt[0] = 0x40;
+ memcpy(&pkt[1], data, sz);
+ i2c_send(pkt, sz+1);
+#endif
}
#define SSD1306_SETCONTRAST 0x81
@@ -344,6 +437,7 @@ void oled_setbuf(uint8_t color)
/*
* Send the frame buffer
*/
+#define I2C_PSZ 1
void oled_refresh(void)
{
uint16_t i;
@@ -353,13 +447,13 @@ void oled_refresh(void)
oled_cmd(OLED_W-1); // Column end address (127 = reset)
oled_cmd(SSD1306_PAGEADDR);
- oled_cmd(4); // Page start address (0 = reset)
- oled_cmd(7); // Page end address
+ oled_cmd(0); // Page start address (0 = reset)
+ oled_cmd(3); // Page end address
- for (i=0;i<sizeof(oled_buffer);i+=16)
+ for (i=0;i<sizeof(oled_buffer);i+=I2C_PSZ)
{
/* send a block of data */
- oled_data(&oled_buffer[i], 16);
+ oled_data(&oled_buffer[i], I2C_PSZ);
}
}
--
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