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authorPatricio Whittingslow <[email protected]>2023-02-23 09:26:14 -0300
committerGitHub <[email protected]>2023-02-23 13:26:14 +0100
commit96b70fd619b9701335a1ae8d827ff1d54bc52330 (patch)
tree16d6bb380605300a3927ec698cbccb976851e26c /src/machine/machine_rp2040_i2c.go
parent4d0dfbd6fd607eacfd77460e74eadae2ba73215c (diff)
downloadtinygo-96b70fd619b9701335a1ae8d827ff1d54bc52330.tar.gz
tinygo-96b70fd619b9701335a1ae8d827ff1d54bc52330.zip
rp2040: provide better errors for invalid pins on i2c and spi (#3443)
machine/rp2040: provide better errors for invalid pins on i2c and spi
Diffstat (limited to 'src/machine/machine_rp2040_i2c.go')
-rw-r--r--src/machine/machine_rp2040_i2c.go19
1 files changed, 18 insertions, 1 deletions
diff --git a/src/machine/machine_rp2040_i2c.go b/src/machine/machine_rp2040_i2c.go
index d49e7f576..2c0c2e6ed 100644
--- a/src/machine/machine_rp2040_i2c.go
+++ b/src/machine/machine_rp2040_i2c.go
@@ -57,6 +57,8 @@ var (
ErrInvalidTgtAddr = errors.New("invalid target i2c address not in 0..0x80 or is reserved")
ErrI2CGeneric = errors.New("i2c error")
ErrRP2040I2CDisable = errors.New("i2c rp2040 peripheral timeout in disable")
+ errInvalidI2CSDA = errors.New("invalid I2C SDA pin")
+ errInvalidI2CSCL = errors.New("invalid I2C SCL pin")
)
// Tx performs a write and then a read transfer placing the result in
@@ -90,7 +92,7 @@ func (i2c *I2C) Tx(addr uint16, w, r []byte) error {
// SCL: 3, 7, 11, 15, 19, 27
func (i2c *I2C) Configure(config I2CConfig) error {
const defaultBaud uint32 = 100_000 // 100kHz standard mode
- if config.SCL == 0 {
+ if config.SCL == 0 && config.SDA == 0 {
// If config pins are zero valued or clock pin is invalid then we set default values.
switch i2c.Bus {
case rp.I2C0:
@@ -101,6 +103,21 @@ func (i2c *I2C) Configure(config I2CConfig) error {
config.SDA = I2C1_SDA_PIN
}
}
+ var okSDA, okSCL bool
+ switch i2c.Bus {
+ case rp.I2C0:
+ okSDA = config.SDA%4 == 0
+ okSCL = (config.SCL+1)%4 == 0
+ case rp.I2C1:
+ okSDA = (config.SDA+2)%4 == 0
+ okSCL = (config.SCL+3)%4 == 0
+ }
+
+ if !okSDA {
+ return errInvalidI2CSDA
+ } else if !okSCL {
+ return errInvalidI2CSCL
+ }
if config.Frequency == 0 {
config.Frequency = defaultBaud
}