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-rw-r--r--src/device/arm/arm.go4
-rw-r--r--src/machine/i2c.go15
-rw-r--r--src/machine/machine_atsamd21.go23
-rw-r--r--src/machine/machine_atsamd51.go23
-rw-r--r--src/machine/machine_fe310.go9
-rw-r--r--src/machine/machine_stm32f103xx.go40
-rw-r--r--src/machine/uart.go4
-rw-r--r--src/machine/usb.go7
8 files changed, 70 insertions, 55 deletions
diff --git a/src/device/arm/arm.go b/src/device/arm/arm.go
index fcac1e574..21ba3bbd9 100644
--- a/src/device/arm/arm.go
+++ b/src/device/arm/arm.go
@@ -35,6 +35,8 @@ import (
"unsafe"
)
+var errCycleCountTooLarge = errors.New("requested cycle count is too large, overflows 24 bit counter")
+
// Run the given assembly code. The code will be marked as having side effects,
// as it doesn't produce output and thus would normally be eliminated by the
// optimizer.
@@ -232,7 +234,7 @@ func SetupSystemTimer(cyclecount uint32) error {
}
if cyclecount&SYST_RVR_RELOAD_Msk != cyclecount {
// The cycle refresh register is only 24 bits wide. The user-specified value will overflow.
- return errors.New("requested cycle count is too large, overflows 24 bit counter")
+ return errCycleCountTooLarge
}
// set refresh count
diff --git a/src/machine/i2c.go b/src/machine/i2c.go
index 25d3180f6..977c9bad0 100644
--- a/src/machine/i2c.go
+++ b/src/machine/i2c.go
@@ -2,12 +2,27 @@
package machine
+import (
+ "errors"
+)
+
// TWI_FREQ is the I2C bus speed. Normally either 100 kHz, or 400 kHz for high-speed bus.
const (
TWI_FREQ_100KHZ = 100000
TWI_FREQ_400KHZ = 400000
)
+var (
+ errI2CWriteTimeout = errors.New("I2C timeout during write")
+ errI2CReadTimeout = errors.New("I2C timeout during read")
+ errI2CBusReadyTimeout = errors.New("I2C timeout on bus ready")
+ errI2CSignalStartTimeout = errors.New("I2C timeout on signal start")
+ errI2CSignalReadTimeout = errors.New("I2C timeout on signal read")
+ errI2CSignalStopTimeout = errors.New("I2C timeout on signal stop")
+ errI2CAckExpected = errors.New("I2C error: expected ACK not NACK")
+ errI2CBusError = errors.New("I2C bus error")
+)
+
// WriteRegister transmits first the register and then the data to the
// peripheral device.
//
diff --git a/src/machine/machine_atsamd21.go b/src/machine/machine_atsamd21.go
index 86491195a..cd83b7b4d 100644
--- a/src/machine/machine_atsamd21.go
+++ b/src/machine/machine_atsamd21.go
@@ -10,7 +10,6 @@ package machine
import (
"device/arm"
"device/sam"
- "errors"
"runtime/interrupt"
"unsafe"
)
@@ -549,13 +548,13 @@ func (i2c I2C) Tx(addr uint16, w, r []byte) error {
for !i2c.Bus.INTFLAG.HasBits(sam.SERCOM_I2CM_INTFLAG_MB) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on ready to write data")
+ return errI2CWriteTimeout
}
}
// ACK received (0: ACK, 1: NACK)
if i2c.Bus.STATUS.HasBits(sam.SERCOM_I2CM_STATUS_RXNACK) {
- return errors.New("I2C write error: expected ACK not NACK")
+ return errI2CAckExpected
}
// write data
@@ -581,13 +580,13 @@ func (i2c I2C) Tx(addr uint16, w, r []byte) error {
// In that case, send a stop condition and return error.
if i2c.Bus.INTFLAG.HasBits(sam.SERCOM_I2CM_INTFLAG_MB) {
i2c.Bus.CTRLB.SetBits(wireCmdStop << sam.SERCOM_I2CM_CTRLB_CMD_Pos) // Stop condition
- return errors.New("I2C read error: expected ACK not NACK")
+ return errI2CAckExpected
}
}
// ACK received (0: ACK, 1: NACK)
if i2c.Bus.STATUS.HasBits(sam.SERCOM_I2CM_STATUS_RXNACK) {
- return errors.New("I2C read error: expected ACK not NACK")
+ return errI2CAckExpected
}
// read first byte
@@ -624,16 +623,16 @@ func (i2c I2C) WriteByte(data byte) error {
for !i2c.Bus.INTFLAG.HasBits(sam.SERCOM_I2CM_INTFLAG_MB) {
// check for bus error
if sam.SERCOM3_I2CM.STATUS.HasBits(sam.SERCOM_I2CM_STATUS_BUSERR) {
- return errors.New("I2C bus error")
+ return errI2CBusError
}
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on write data")
+ return errI2CWriteTimeout
}
}
if i2c.Bus.STATUS.HasBits(sam.SERCOM_I2CM_STATUS_RXNACK) {
- return errors.New("I2C write error: expected ACK not NACK")
+ return errI2CAckExpected
}
return nil
@@ -652,7 +651,7 @@ func (i2c I2C) sendAddress(address uint16, write bool) error {
!i2c.Bus.STATUS.HasBits(wireOwnerState<<sam.SERCOM_I2CM_STATUS_BUSSTATE_Pos) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on bus ready")
+ return errI2CBusReadyTimeout
}
}
i2c.Bus.ADDR.Set(uint32(data))
@@ -666,7 +665,7 @@ func (i2c I2C) signalStop() error {
for i2c.Bus.SYNCBUSY.HasBits(sam.SERCOM_I2CM_SYNCBUSY_SYSOP) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on signal stop")
+ return errI2CSignalStopTimeout
}
}
return nil
@@ -678,7 +677,7 @@ func (i2c I2C) signalRead() error {
for i2c.Bus.SYNCBUSY.HasBits(sam.SERCOM_I2CM_SYNCBUSY_SYSOP) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on signal read")
+ return errI2CSignalReadTimeout
}
}
return nil
@@ -1286,7 +1285,7 @@ func (usbcdc USBCDC) WriteByte(c byte) error {
for (getEPINTFLAG(usb_CDC_ENDPOINT_IN) & sam.USB_DEVICE_EPINTFLAG_TRCPT1) == 0 {
timeout--
if timeout == 0 {
- return errors.New("USBCDC write byte timeout")
+ return errUSBCDCWriteByteTimeout
}
}
}
diff --git a/src/machine/machine_atsamd51.go b/src/machine/machine_atsamd51.go
index 3879f0378..9270ed34f 100644
--- a/src/machine/machine_atsamd51.go
+++ b/src/machine/machine_atsamd51.go
@@ -10,7 +10,6 @@ package machine
import (
"device/arm"
"device/sam"
- "errors"
"runtime/interrupt"
"unsafe"
)
@@ -925,13 +924,13 @@ func (i2c I2C) Tx(addr uint16, w, r []byte) error {
for !i2c.Bus.INTFLAG.HasBits(sam.SERCOM_I2CM_INTFLAG_MB) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on ready to write data")
+ return errI2CWriteTimeout
}
}
// ACK received (0: ACK, 1: NACK)
if i2c.Bus.STATUS.HasBits(sam.SERCOM_I2CM_STATUS_RXNACK) {
- return errors.New("I2C write error: expected ACK not NACK")
+ return errI2CAckExpected
}
// write data
@@ -957,13 +956,13 @@ func (i2c I2C) Tx(addr uint16, w, r []byte) error {
// In that case, send a stop condition and return error.
if i2c.Bus.INTFLAG.HasBits(sam.SERCOM_I2CM_INTFLAG_MB) {
i2c.Bus.CTRLB.SetBits(wireCmdStop << sam.SERCOM_I2CM_CTRLB_CMD_Pos) // Stop condition
- return errors.New("I2C read error: expected ACK not NACK")
+ return errI2CAckExpected
}
}
// ACK received (0: ACK, 1: NACK)
if i2c.Bus.STATUS.HasBits(sam.SERCOM_I2CM_STATUS_RXNACK) {
- return errors.New("I2C read error: expected ACK not NACK")
+ return errI2CAckExpected
}
// read first byte
@@ -1000,16 +999,16 @@ func (i2c I2C) WriteByte(data byte) error {
for !i2c.Bus.INTFLAG.HasBits(sam.SERCOM_I2CM_INTFLAG_MB) {
// check for bus error
if i2c.Bus.STATUS.HasBits(sam.SERCOM_I2CM_STATUS_BUSERR) {
- return errors.New("I2C bus error")
+ return errI2CBusError
}
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on write data")
+ return errI2CWriteTimeout
}
}
if i2c.Bus.STATUS.HasBits(sam.SERCOM_I2CM_STATUS_RXNACK) {
- return errors.New("I2C write error: expected ACK not NACK")
+ return errI2CAckExpected
}
return nil
@@ -1028,7 +1027,7 @@ func (i2c I2C) sendAddress(address uint16, write bool) error {
!i2c.Bus.STATUS.HasBits(wireOwnerState<<sam.SERCOM_I2CM_STATUS_BUSSTATE_Pos) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on bus ready")
+ return errI2CBusReadyTimeout
}
}
i2c.Bus.ADDR.Set(uint32(data))
@@ -1042,7 +1041,7 @@ func (i2c I2C) signalStop() error {
for i2c.Bus.SYNCBUSY.HasBits(sam.SERCOM_I2CM_SYNCBUSY_SYSOP) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on signal stop")
+ return errI2CSignalStopTimeout
}
}
return nil
@@ -1054,7 +1053,7 @@ func (i2c I2C) signalRead() error {
for i2c.Bus.SYNCBUSY.HasBits(sam.SERCOM_I2CM_SYNCBUSY_SYSOP) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on signal read")
+ return errI2CSignalReadTimeout
}
}
return nil
@@ -1455,7 +1454,7 @@ func (usbcdc USBCDC) WriteByte(c byte) error {
for (getEPINTFLAG(usb_CDC_ENDPOINT_IN) & sam.USB_DEVICE_ENDPOINT_EPINTFLAG_TRCPT1) == 0 {
timeout--
if timeout == 0 {
- return errors.New("USBCDC write byte timeout")
+ return errUSBCDCWriteByteTimeout
}
}
}
diff --git a/src/machine/machine_fe310.go b/src/machine/machine_fe310.go
index 0a5048f54..f2de10924 100644
--- a/src/machine/machine_fe310.go
+++ b/src/machine/machine_fe310.go
@@ -4,7 +4,6 @@ package machine
import (
"device/sifive"
- "errors"
"runtime/interrupt"
)
@@ -195,8 +194,6 @@ type I2CConfig struct {
SDA Pin
}
-var i2cAckExpectedError error = errors.New("I2C write error: expected ACK not NACK")
-
// Configure is intended to setup the I2C interface.
func (i2c I2C) Configure(config I2CConfig) error {
var i2cClockFrequency uint32 = 32000000
@@ -238,7 +235,7 @@ func (i2c I2C) Tx(addr uint16, w, r []byte) error {
// ACK received (0: ACK, 1: NACK)
if i2c.Bus.CR_SR.HasBits(sifive.I2C_SR_RX_ACK) {
- return i2cAckExpectedError
+ return errI2CAckExpected
}
// write data
@@ -255,7 +252,7 @@ func (i2c I2C) Tx(addr uint16, w, r []byte) error {
// ACK received (0: ACK, 1: NACK)
if i2c.Bus.CR_SR.HasBits(sifive.I2C_SR_RX_ACK) {
- return i2cAckExpectedError
+ return errI2CAckExpected
}
// read first byte
@@ -290,7 +287,7 @@ func (i2c I2C) writeByte(data byte) error {
// ACK received (0: ACK, 1: NACK)
if i2c.Bus.CR_SR.HasBits(sifive.I2C_SR_RX_ACK) {
- return i2cAckExpectedError
+ return errI2CAckExpected
}
return nil
diff --git a/src/machine/machine_stm32f103xx.go b/src/machine/machine_stm32f103xx.go
index 70cdc6b24..0ec3dcccb 100644
--- a/src/machine/machine_stm32f103xx.go
+++ b/src/machine/machine_stm32f103xx.go
@@ -6,7 +6,6 @@ package machine
import (
"device/stm32"
- "errors"
"runtime/interrupt"
"unsafe"
)
@@ -343,7 +342,7 @@ func (i2c I2C) Tx(addr uint16, w, r []byte) error {
for !i2c.Bus.SR2.HasBits(stm32.I2C_SR2_MSL | stm32.I2C_SR2_BUSY) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on read clear address")
+ return errI2CWriteTimeout
}
}
@@ -354,7 +353,7 @@ func (i2c I2C) Tx(addr uint16, w, r []byte) error {
for !i2c.Bus.SR1.HasBits(stm32.I2C_SR1_RxNE) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on read 1 byte")
+ return errI2CReadTimeout
}
}
@@ -382,7 +381,7 @@ func (i2c I2C) Tx(addr uint16, w, r []byte) error {
for !i2c.Bus.SR2.HasBits(stm32.I2C_SR2_MSL | stm32.I2C_SR2_BUSY) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on read clear address")
+ return errI2CWriteTimeout
}
}
@@ -394,7 +393,7 @@ func (i2c I2C) Tx(addr uint16, w, r []byte) error {
for !i2c.Bus.SR1.HasBits(stm32.I2C_SR1_BTF) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on read 2 bytes")
+ return errI2CReadTimeout
}
}
@@ -428,7 +427,7 @@ func (i2c I2C) Tx(addr uint16, w, r []byte) error {
for !i2c.Bus.SR2.HasBits(stm32.I2C_SR2_MSL | stm32.I2C_SR2_BUSY) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on read clear address")
+ return errI2CWriteTimeout
}
}
@@ -440,8 +439,7 @@ func (i2c I2C) Tx(addr uint16, w, r []byte) error {
for !i2c.Bus.SR1.HasBits(stm32.I2C_SR1_BTF) {
timeout--
if timeout == 0 {
- println("I2C timeout on read 3 bytes")
- return errors.New("I2C timeout on read 3 bytes")
+ return errI2CReadTimeout
}
}
@@ -455,7 +453,7 @@ func (i2c I2C) Tx(addr uint16, w, r []byte) error {
for !i2c.Bus.SR1.HasBits(stm32.I2C_SR1_BTF) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on read 3 bytes")
+ return errI2CReadTimeout
}
}
@@ -483,7 +481,7 @@ func (i2c I2C) Tx(addr uint16, w, r []byte) error {
for !i2c.Bus.SR2.HasBits(stm32.I2C_SR2_MSL | stm32.I2C_SR2_BUSY) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on read clear address")
+ return errI2CWriteTimeout
}
}
@@ -496,8 +494,7 @@ func (i2c I2C) Tx(addr uint16, w, r []byte) error {
for !i2c.Bus.SR1.HasBits(stm32.I2C_SR1_BTF) {
timeout--
if timeout == 0 {
- println("I2C timeout on read 3 bytes")
- return errors.New("I2C timeout on read 3 bytes")
+ return errI2CReadTimeout
}
}
@@ -510,7 +507,7 @@ func (i2c I2C) Tx(addr uint16, w, r []byte) error {
for !i2c.Bus.SR1.HasBits(stm32.I2C_SR1_BTF) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on read more than 3 bytes")
+ return errI2CReadTimeout
}
}
@@ -530,7 +527,7 @@ func (i2c I2C) Tx(addr uint16, w, r []byte) error {
for !i2c.Bus.SR1.HasBits(stm32.I2C_SR1_RxNE) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on read last byte of more than 3")
+ return errI2CReadTimeout
}
}
@@ -554,7 +551,7 @@ func (i2c I2C) signalStart() error {
for i2c.Bus.SR2.HasBits(stm32.I2C_SR2_BUSY) {
timeout--
if timeout == 0 {
- return errors.New("I2C busy on start")
+ return errI2CSignalStartTimeout
}
}
@@ -569,7 +566,7 @@ func (i2c I2C) signalStart() error {
for !i2c.Bus.SR1.HasBits(stm32.I2C_SR1_SB) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on start")
+ return errI2CSignalStartTimeout
}
}
@@ -592,8 +589,7 @@ func (i2c I2C) waitForStop() error {
for i2c.Bus.SR1.HasBits(stm32.I2C_SR1_STOPF) {
timeout--
if timeout == 0 {
- println("I2C timeout on wait for stop signal")
- return errors.New("I2C timeout on wait for stop signal")
+ return errI2CSignalStopTimeout
}
}
@@ -617,7 +613,7 @@ func (i2c I2C) sendAddress(address uint8, write bool) error {
for !i2c.Bus.SR1.HasBits(stm32.I2C_SR1_ADDR) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on send write address")
+ return errI2CWriteTimeout
}
}
@@ -625,7 +621,7 @@ func (i2c I2C) sendAddress(address uint8, write bool) error {
for !i2c.Bus.SR2.HasBits(stm32.I2C_SR2_MSL | stm32.I2C_SR2_BUSY | stm32.I2C_SR2_TRA) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on send write address")
+ return errI2CWriteTimeout
}
}
} else {
@@ -633,7 +629,7 @@ func (i2c I2C) sendAddress(address uint8, write bool) error {
for !i2c.Bus.SR1.HasBits(stm32.I2C_SR1_ADDR) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on send read address")
+ return errI2CWriteTimeout
}
}
}
@@ -653,7 +649,7 @@ func (i2c I2C) WriteByte(data byte) error {
for !i2c.Bus.SR1.HasBits(stm32.I2C_SR1_TxE) {
timeout--
if timeout == 0 {
- return errors.New("I2C timeout on write")
+ return errI2CWriteTimeout
}
}
diff --git a/src/machine/uart.go b/src/machine/uart.go
index bcaefa9d9..19febc755 100644
--- a/src/machine/uart.go
+++ b/src/machine/uart.go
@@ -4,6 +4,8 @@ package machine
import "errors"
+var errUARTBufferEmpty = errors.New("UART buffer empty")
+
type UARTConfig struct {
BaudRate uint32
TX Pin
@@ -60,7 +62,7 @@ func (uart UART) ReadByte() (byte, error) {
// check if RX buffer is empty
buf, ok := uart.Buffer.Get()
if !ok {
- return 0, errors.New("Buffer empty")
+ return 0, errUARTBufferEmpty
}
return buf, nil
}
diff --git a/src/machine/usb.go b/src/machine/usb.go
index f9efe9725..68466e265 100644
--- a/src/machine/usb.go
+++ b/src/machine/usb.go
@@ -9,6 +9,11 @@ import (
const deviceDescriptorSize = 18
+var (
+ errUSBCDCBufferEmpty = errors.New("USB-CDC buffer empty")
+ errUSBCDCWriteByteTimeout = errors.New("USB-CDC write byte timeout")
+)
+
// DeviceDescriptor implements the USB standard device descriptor.
//
// Table 9-8. Standard Device Descriptor
@@ -598,7 +603,7 @@ func (usbcdc USBCDC) ReadByte() (byte, error) {
// check if RX buffer is empty
buf, ok := usbcdc.Buffer.Get()
if !ok {
- return 0, errors.New("Buffer empty")
+ return 0, errUSBCDCBufferEmpty
}
return buf, nil
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-26 19:03:44 +0000